ffmpeg / libavformat / utils.c @ 5509bffa
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/*
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* Various utilities for ffmpeg system
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h" |
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#undef NDEBUG
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#include <assert.h> |
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/**
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* @file libavformat/utils.c
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* Various utility functions for using ffmpeg library.
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*/
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/** head of registered input format linked list. */
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AVInputFormat *first_iformat = NULL;
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/** head of registered output format linked list. */
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AVOutputFormat *first_oformat = NULL;
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/** head of registered image format linked list. */
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AVImageFormat *first_image_format = NULL;
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void av_register_input_format(AVInputFormat *format)
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{
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AVInputFormat **p; |
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p = &first_iformat; |
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while (*p != NULL) p = &(*p)->next; |
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*p = format; |
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format->next = NULL;
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} |
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void av_register_output_format(AVOutputFormat *format)
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{
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AVOutputFormat **p; |
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p = &first_oformat; |
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while (*p != NULL) p = &(*p)->next; |
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*p = format; |
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format->next = NULL;
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} |
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int match_ext(const char *filename, const char *extensions) |
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{
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const char *ext, *p; |
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char ext1[32], *q; |
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if(!filename)
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return 0; |
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ext = strrchr(filename, '.');
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if (ext) {
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ext++; |
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p = extensions; |
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for(;;) {
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q = ext1; |
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while (*p != '\0' && *p != ',' && q-ext1<sizeof(ext1)-1) |
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*q++ = *p++; |
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*q = '\0';
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if (!strcasecmp(ext1, ext))
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return 1; |
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if (*p == '\0') |
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break;
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p++; |
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} |
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} |
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return 0; |
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} |
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|
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AVOutputFormat *guess_format(const char *short_name, const char *filename, |
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const char *mime_type) |
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{
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AVOutputFormat *fmt, *fmt_found; |
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int score_max, score;
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/* specific test for image sequences */
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if (!short_name && filename &&
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filename_number_test(filename) >= 0 &&
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av_guess_image2_codec(filename) != CODEC_ID_NONE) {
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return guess_format("image2", NULL, NULL); |
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} |
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if (!short_name && filename &&
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filename_number_test(filename) >= 0 &&
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guess_image_format(filename)) {
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return guess_format("image", NULL, NULL); |
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} |
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/* find the proper file type */
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fmt_found = NULL;
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score_max = 0;
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fmt = first_oformat; |
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while (fmt != NULL) { |
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score = 0;
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if (fmt->name && short_name && !strcmp(fmt->name, short_name))
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score += 100;
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if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
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score += 10;
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if (filename && fmt->extensions &&
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match_ext(filename, fmt->extensions)) {
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score += 5;
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} |
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if (score > score_max) {
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score_max = score; |
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fmt_found = fmt; |
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} |
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fmt = fmt->next; |
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} |
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return fmt_found;
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} |
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AVOutputFormat *guess_stream_format(const char *short_name, const char *filename, |
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const char *mime_type) |
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{
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AVOutputFormat *fmt = guess_format(short_name, filename, mime_type); |
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if (fmt) {
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AVOutputFormat *stream_fmt; |
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char stream_format_name[64]; |
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snprintf(stream_format_name, sizeof(stream_format_name), "%s_stream", fmt->name); |
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stream_fmt = guess_format(stream_format_name, NULL, NULL); |
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if (stream_fmt)
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fmt = stream_fmt; |
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} |
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return fmt;
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} |
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/**
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* Guesses the codec id based upon muxer and filename.
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*/
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enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name, |
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const char *filename, const char *mime_type, enum CodecType type){ |
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if(type == CODEC_TYPE_VIDEO){
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enum CodecID codec_id= CODEC_ID_NONE;
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|
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if(!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")){ |
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codec_id= av_guess_image2_codec(filename); |
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} |
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if(codec_id == CODEC_ID_NONE)
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codec_id= fmt->video_codec; |
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return codec_id;
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}else if(type == CODEC_TYPE_AUDIO) |
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return fmt->audio_codec;
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else
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return CODEC_ID_NONE;
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} |
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/**
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* finds AVInputFormat based on input format's short name.
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*/
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AVInputFormat *av_find_input_format(const char *short_name) |
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{
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AVInputFormat *fmt; |
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for(fmt = first_iformat; fmt != NULL; fmt = fmt->next) { |
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if (!strcmp(fmt->name, short_name))
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return fmt;
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} |
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return NULL; |
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} |
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/* memory handling */
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/**
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* Default packet destructor.
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*/
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void av_destruct_packet(AVPacket *pkt)
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{
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av_free(pkt->data); |
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pkt->data = NULL; pkt->size = 0; |
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} |
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/**
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* Allocate the payload of a packet and intialized its fields to default values.
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*
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* @param pkt packet
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* @param size wanted payload size
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* @return 0 if OK. AVERROR_xxx otherwise.
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*/
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int av_new_packet(AVPacket *pkt, int size) |
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{
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void *data;
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if((unsigned)size > (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE) |
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return AVERROR_NOMEM;
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data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!data)
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return AVERROR_NOMEM;
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memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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av_init_packet(pkt); |
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pkt->data = data; |
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pkt->size = size; |
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pkt->destruct = av_destruct_packet; |
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return 0; |
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} |
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/**
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* Allocate and read the payload of a packet and intialized its fields to default values.
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*
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* @param pkt packet
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* @param size wanted payload size
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* @return >0 (read size) if OK. AVERROR_xxx otherwise.
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*/
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int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size) |
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{
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int ret= av_new_packet(pkt, size);
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if(ret<0) |
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return ret;
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pkt->pos= url_ftell(s); |
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ret= get_buffer(s, pkt->data, size); |
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if(ret<=0) |
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av_free_packet(pkt); |
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else
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pkt->size= ret; |
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return ret;
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} |
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/* This is a hack - the packet memory allocation stuff is broken. The
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packet is allocated if it was not really allocated */
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int av_dup_packet(AVPacket *pkt)
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{
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if (pkt->destruct != av_destruct_packet) {
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uint8_t *data; |
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/* we duplicate the packet and don't forget to put the padding
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again */
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if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE) |
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return AVERROR_NOMEM;
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data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!data) {
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return AVERROR_NOMEM;
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} |
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memcpy(data, pkt->data, pkt->size); |
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memset(data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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pkt->data = data; |
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pkt->destruct = av_destruct_packet; |
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} |
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return 0; |
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} |
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/* fifo handling */
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int fifo_init(FifoBuffer *f, int size) |
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{
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f->buffer = av_malloc(size); |
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if (!f->buffer)
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return -1; |
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f->end = f->buffer + size; |
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f->wptr = f->rptr = f->buffer; |
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return 0; |
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} |
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void fifo_free(FifoBuffer *f)
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{
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av_free(f->buffer); |
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} |
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int fifo_size(FifoBuffer *f, uint8_t *rptr)
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{
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int size;
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if(!rptr)
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rptr= f->rptr; |
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if (f->wptr >= rptr) {
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size = f->wptr - rptr; |
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} else {
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size = (f->end - rptr) + (f->wptr - f->buffer); |
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} |
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return size;
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} |
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/**
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* Get data from the fifo (returns -1 if not enough data).
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*/
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int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr) |
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{
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uint8_t *rptr; |
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int size, len;
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|
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if(!rptr_ptr)
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rptr_ptr= &f->rptr; |
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rptr = *rptr_ptr; |
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if (f->wptr >= rptr) {
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size = f->wptr - rptr; |
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} else {
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size = (f->end - rptr) + (f->wptr - f->buffer); |
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} |
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|
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if (size < buf_size)
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return -1; |
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while (buf_size > 0) { |
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len = f->end - rptr; |
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if (len > buf_size)
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len = buf_size; |
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memcpy(buf, rptr, len); |
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buf += len; |
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rptr += len; |
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if (rptr >= f->end)
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rptr = f->buffer; |
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buf_size -= len; |
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} |
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*rptr_ptr = rptr; |
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return 0; |
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} |
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|
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/**
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* Resizes a FIFO.
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*/
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void fifo_realloc(FifoBuffer *f, unsigned int new_size){ |
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unsigned int old_size= f->end - f->buffer; |
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|
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if(old_size < new_size){
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uint8_t *old= f->buffer; |
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|
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f->buffer= av_realloc(f->buffer, new_size); |
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|
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f->rptr += f->buffer - old; |
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f->wptr += f->buffer - old; |
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|
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if(f->wptr < f->rptr){
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memmove(f->rptr + new_size - old_size, f->rptr, f->buffer + old_size - f->rptr); |
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f->rptr += new_size - old_size; |
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} |
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f->end= f->buffer + new_size; |
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} |
| 343 |
} |
| 344 |
|
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void fifo_write(FifoBuffer *f, uint8_t *buf, int size, uint8_t **wptr_ptr) |
| 346 |
{
|
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int len;
|
| 348 |
uint8_t *wptr; |
| 349 |
|
| 350 |
if(!wptr_ptr)
|
| 351 |
wptr_ptr= &f->wptr; |
| 352 |
wptr = *wptr_ptr; |
| 353 |
|
| 354 |
while (size > 0) { |
| 355 |
len = f->end - wptr; |
| 356 |
if (len > size)
|
| 357 |
len = size; |
| 358 |
memcpy(wptr, buf, len); |
| 359 |
wptr += len; |
| 360 |
if (wptr >= f->end)
|
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wptr = f->buffer; |
| 362 |
buf += len; |
| 363 |
size -= len; |
| 364 |
} |
| 365 |
*wptr_ptr = wptr; |
| 366 |
} |
| 367 |
|
| 368 |
/* get data from the fifo (return -1 if not enough data) */
|
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int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr) |
| 370 |
{
|
| 371 |
uint8_t *rptr = *rptr_ptr; |
| 372 |
int size, len;
|
| 373 |
|
| 374 |
if (f->wptr >= rptr) {
|
| 375 |
size = f->wptr - rptr; |
| 376 |
} else {
|
| 377 |
size = (f->end - rptr) + (f->wptr - f->buffer); |
| 378 |
} |
| 379 |
|
| 380 |
if (size < buf_size)
|
| 381 |
return -1; |
| 382 |
while (buf_size > 0) { |
| 383 |
len = f->end - rptr; |
| 384 |
if (len > buf_size)
|
| 385 |
len = buf_size; |
| 386 |
put_buffer(pb, rptr, len); |
| 387 |
rptr += len; |
| 388 |
if (rptr >= f->end)
|
| 389 |
rptr = f->buffer; |
| 390 |
buf_size -= len; |
| 391 |
} |
| 392 |
*rptr_ptr = rptr; |
| 393 |
return 0; |
| 394 |
} |
| 395 |
|
| 396 |
int filename_number_test(const char *filename) |
| 397 |
{
|
| 398 |
char buf[1024]; |
| 399 |
if(!filename)
|
| 400 |
return -1; |
| 401 |
return get_frame_filename(buf, sizeof(buf), filename, 1); |
| 402 |
} |
| 403 |
|
| 404 |
/**
|
| 405 |
* Guess file format.
|
| 406 |
*/
|
| 407 |
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
|
| 408 |
{
|
| 409 |
AVInputFormat *fmt1, *fmt; |
| 410 |
int score, score_max;
|
| 411 |
|
| 412 |
fmt = NULL;
|
| 413 |
score_max = 0;
|
| 414 |
for(fmt1 = first_iformat; fmt1 != NULL; fmt1 = fmt1->next) { |
| 415 |
if (!is_opened && !(fmt1->flags & AVFMT_NOFILE))
|
| 416 |
continue;
|
| 417 |
score = 0;
|
| 418 |
if (fmt1->read_probe) {
|
| 419 |
score = fmt1->read_probe(pd); |
| 420 |
} else if (fmt1->extensions) { |
| 421 |
if (match_ext(pd->filename, fmt1->extensions)) {
|
| 422 |
score = 50;
|
| 423 |
} |
| 424 |
} |
| 425 |
if (score > score_max) {
|
| 426 |
score_max = score; |
| 427 |
fmt = fmt1; |
| 428 |
} |
| 429 |
} |
| 430 |
return fmt;
|
| 431 |
} |
| 432 |
|
| 433 |
/************************************************************/
|
| 434 |
/* input media file */
|
| 435 |
|
| 436 |
/**
|
| 437 |
* Open a media file from an IO stream. 'fmt' must be specified.
|
| 438 |
*/
|
| 439 |
static const char* format_to_name(void* ptr) |
| 440 |
{
|
| 441 |
AVFormatContext* fc = (AVFormatContext*) ptr; |
| 442 |
if(fc->iformat) return fc->iformat->name; |
| 443 |
else if(fc->oformat) return fc->oformat->name; |
| 444 |
else return "NULL"; |
| 445 |
} |
| 446 |
|
| 447 |
static const AVClass av_format_context_class = { "AVFormatContext", format_to_name }; |
| 448 |
|
| 449 |
AVFormatContext *av_alloc_format_context(void)
|
| 450 |
{
|
| 451 |
AVFormatContext *ic; |
| 452 |
ic = av_mallocz(sizeof(AVFormatContext));
|
| 453 |
if (!ic) return ic; |
| 454 |
ic->av_class = &av_format_context_class; |
| 455 |
return ic;
|
| 456 |
} |
| 457 |
|
| 458 |
/**
|
| 459 |
* Allocates all the structures needed to read an input stream.
|
| 460 |
* This does not open the needed codecs for decoding the stream[s].
|
| 461 |
*/
|
| 462 |
int av_open_input_stream(AVFormatContext **ic_ptr,
|
| 463 |
ByteIOContext *pb, const char *filename, |
| 464 |
AVInputFormat *fmt, AVFormatParameters *ap) |
| 465 |
{
|
| 466 |
int err;
|
| 467 |
AVFormatContext *ic; |
| 468 |
|
| 469 |
ic = av_alloc_format_context(); |
| 470 |
if (!ic) {
|
| 471 |
err = AVERROR_NOMEM; |
| 472 |
goto fail;
|
| 473 |
} |
| 474 |
ic->iformat = fmt; |
| 475 |
if (pb)
|
| 476 |
ic->pb = *pb; |
| 477 |
ic->duration = AV_NOPTS_VALUE; |
| 478 |
ic->start_time = AV_NOPTS_VALUE; |
| 479 |
pstrcpy(ic->filename, sizeof(ic->filename), filename);
|
| 480 |
|
| 481 |
/* allocate private data */
|
| 482 |
if (fmt->priv_data_size > 0) { |
| 483 |
ic->priv_data = av_mallocz(fmt->priv_data_size); |
| 484 |
if (!ic->priv_data) {
|
| 485 |
err = AVERROR_NOMEM; |
| 486 |
goto fail;
|
| 487 |
} |
| 488 |
} else {
|
| 489 |
ic->priv_data = NULL;
|
| 490 |
} |
| 491 |
|
| 492 |
err = ic->iformat->read_header(ic, ap); |
| 493 |
if (err < 0) |
| 494 |
goto fail;
|
| 495 |
|
| 496 |
if (pb)
|
| 497 |
ic->data_offset = url_ftell(&ic->pb); |
| 498 |
|
| 499 |
*ic_ptr = ic; |
| 500 |
return 0; |
| 501 |
fail:
|
| 502 |
if (ic) {
|
| 503 |
av_freep(&ic->priv_data); |
| 504 |
} |
| 505 |
av_free(ic); |
| 506 |
*ic_ptr = NULL;
|
| 507 |
return err;
|
| 508 |
} |
| 509 |
|
| 510 |
/** Size of probe buffer, for guessing file type from file contents. */
|
| 511 |
#define PROBE_BUF_SIZE 2048 |
| 512 |
|
| 513 |
/**
|
| 514 |
* Open a media file as input. The codec are not opened. Only the file
|
| 515 |
* header (if present) is read.
|
| 516 |
*
|
| 517 |
* @param ic_ptr the opened media file handle is put here
|
| 518 |
* @param filename filename to open.
|
| 519 |
* @param fmt if non NULL, force the file format to use
|
| 520 |
* @param buf_size optional buffer size (zero if default is OK)
|
| 521 |
* @param ap additionnal parameters needed when opening the file (NULL if default)
|
| 522 |
* @return 0 if OK. AVERROR_xxx otherwise.
|
| 523 |
*/
|
| 524 |
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename, |
| 525 |
AVInputFormat *fmt, |
| 526 |
int buf_size,
|
| 527 |
AVFormatParameters *ap) |
| 528 |
{
|
| 529 |
int err, must_open_file, file_opened;
|
| 530 |
uint8_t buf[PROBE_BUF_SIZE]; |
| 531 |
AVProbeData probe_data, *pd = &probe_data; |
| 532 |
ByteIOContext pb1, *pb = &pb1; |
| 533 |
|
| 534 |
file_opened = 0;
|
| 535 |
pd->filename = "";
|
| 536 |
if (filename)
|
| 537 |
pd->filename = filename; |
| 538 |
pd->buf = buf; |
| 539 |
pd->buf_size = 0;
|
| 540 |
|
| 541 |
if (!fmt) {
|
| 542 |
/* guess format if no file can be opened */
|
| 543 |
fmt = av_probe_input_format(pd, 0);
|
| 544 |
} |
| 545 |
|
| 546 |
/* do not open file if the format does not need it. XXX: specific
|
| 547 |
hack needed to handle RTSP/TCP */
|
| 548 |
must_open_file = 1;
|
| 549 |
if (fmt && (fmt->flags & AVFMT_NOFILE)) {
|
| 550 |
must_open_file = 0;
|
| 551 |
pb= NULL; //FIXME this or memset(pb, 0, sizeof(ByteIOContext)); otherwise its uninitalized |
| 552 |
} |
| 553 |
|
| 554 |
if (!fmt || must_open_file) {
|
| 555 |
/* if no file needed do not try to open one */
|
| 556 |
if (url_fopen(pb, filename, URL_RDONLY) < 0) { |
| 557 |
err = AVERROR_IO; |
| 558 |
goto fail;
|
| 559 |
} |
| 560 |
file_opened = 1;
|
| 561 |
if (buf_size > 0) { |
| 562 |
url_setbufsize(pb, buf_size); |
| 563 |
} |
| 564 |
if (!fmt) {
|
| 565 |
/* read probe data */
|
| 566 |
pd->buf_size = get_buffer(pb, buf, PROBE_BUF_SIZE); |
| 567 |
if (url_fseek(pb, 0, SEEK_SET) == (offset_t)-EPIPE) { |
| 568 |
url_fclose(pb); |
| 569 |
if (url_fopen(pb, filename, URL_RDONLY) < 0) { |
| 570 |
err = AVERROR_IO; |
| 571 |
goto fail;
|
| 572 |
} |
| 573 |
} |
| 574 |
} |
| 575 |
} |
| 576 |
|
| 577 |
/* guess file format */
|
| 578 |
if (!fmt) {
|
| 579 |
fmt = av_probe_input_format(pd, 1);
|
| 580 |
} |
| 581 |
|
| 582 |
/* if still no format found, error */
|
| 583 |
if (!fmt) {
|
| 584 |
err = AVERROR_NOFMT; |
| 585 |
goto fail;
|
| 586 |
} |
| 587 |
|
| 588 |
/* XXX: suppress this hack for redirectors */
|
| 589 |
#ifdef CONFIG_NETWORK
|
| 590 |
if (fmt == &redir_demux) {
|
| 591 |
err = redir_open(ic_ptr, pb); |
| 592 |
url_fclose(pb); |
| 593 |
return err;
|
| 594 |
} |
| 595 |
#endif
|
| 596 |
|
| 597 |
/* check filename in case of an image number is expected */
|
| 598 |
if (fmt->flags & AVFMT_NEEDNUMBER) {
|
| 599 |
if (filename_number_test(filename) < 0) { |
| 600 |
err = AVERROR_NUMEXPECTED; |
| 601 |
goto fail;
|
| 602 |
} |
| 603 |
} |
| 604 |
err = av_open_input_stream(ic_ptr, pb, filename, fmt, ap); |
| 605 |
if (err)
|
| 606 |
goto fail;
|
| 607 |
return 0; |
| 608 |
fail:
|
| 609 |
if (file_opened)
|
| 610 |
url_fclose(pb); |
| 611 |
*ic_ptr = NULL;
|
| 612 |
return err;
|
| 613 |
|
| 614 |
} |
| 615 |
|
| 616 |
/*******************************************************/
|
| 617 |
|
| 618 |
/**
|
| 619 |
* Read a transport packet from a media file.
|
| 620 |
*
|
| 621 |
* This function is absolete and should never be used.
|
| 622 |
* Use av_read_frame() instead.
|
| 623 |
*
|
| 624 |
* @param s media file handle
|
| 625 |
* @param pkt is filled
|
| 626 |
* @return 0 if OK. AVERROR_xxx if error.
|
| 627 |
*/
|
| 628 |
int av_read_packet(AVFormatContext *s, AVPacket *pkt)
|
| 629 |
{
|
| 630 |
return s->iformat->read_packet(s, pkt);
|
| 631 |
} |
| 632 |
|
| 633 |
/**********************************************************/
|
| 634 |
|
| 635 |
/**
|
| 636 |
* Get the number of samples of an audio frame. Return (-1) if error.
|
| 637 |
*/
|
| 638 |
static int get_audio_frame_size(AVCodecContext *enc, int size) |
| 639 |
{
|
| 640 |
int frame_size;
|
| 641 |
|
| 642 |
if (enc->frame_size <= 1) { |
| 643 |
/* specific hack for pcm codecs because no frame size is
|
| 644 |
provided */
|
| 645 |
switch(enc->codec_id) {
|
| 646 |
case CODEC_ID_PCM_S32LE:
|
| 647 |
case CODEC_ID_PCM_S32BE:
|
| 648 |
case CODEC_ID_PCM_U32LE:
|
| 649 |
case CODEC_ID_PCM_U32BE:
|
| 650 |
if (enc->channels == 0) |
| 651 |
return -1; |
| 652 |
frame_size = size / (4 * enc->channels);
|
| 653 |
break;
|
| 654 |
case CODEC_ID_PCM_S24LE:
|
| 655 |
case CODEC_ID_PCM_S24BE:
|
| 656 |
case CODEC_ID_PCM_U24LE:
|
| 657 |
case CODEC_ID_PCM_U24BE:
|
| 658 |
case CODEC_ID_PCM_S24DAUD:
|
| 659 |
if (enc->channels == 0) |
| 660 |
return -1; |
| 661 |
frame_size = size / (3 * enc->channels);
|
| 662 |
break;
|
| 663 |
case CODEC_ID_PCM_S16LE:
|
| 664 |
case CODEC_ID_PCM_S16BE:
|
| 665 |
case CODEC_ID_PCM_U16LE:
|
| 666 |
case CODEC_ID_PCM_U16BE:
|
| 667 |
if (enc->channels == 0) |
| 668 |
return -1; |
| 669 |
frame_size = size / (2 * enc->channels);
|
| 670 |
break;
|
| 671 |
case CODEC_ID_PCM_S8:
|
| 672 |
case CODEC_ID_PCM_U8:
|
| 673 |
case CODEC_ID_PCM_MULAW:
|
| 674 |
case CODEC_ID_PCM_ALAW:
|
| 675 |
if (enc->channels == 0) |
| 676 |
return -1; |
| 677 |
frame_size = size / (enc->channels); |
| 678 |
break;
|
| 679 |
default:
|
| 680 |
/* used for example by ADPCM codecs */
|
| 681 |
if (enc->bit_rate == 0) |
| 682 |
return -1; |
| 683 |
frame_size = (size * 8 * enc->sample_rate) / enc->bit_rate;
|
| 684 |
break;
|
| 685 |
} |
| 686 |
} else {
|
| 687 |
frame_size = enc->frame_size; |
| 688 |
} |
| 689 |
return frame_size;
|
| 690 |
} |
| 691 |
|
| 692 |
|
| 693 |
/**
|
| 694 |
* Return the frame duration in seconds, return 0 if not available.
|
| 695 |
*/
|
| 696 |
static void compute_frame_duration(int *pnum, int *pden, AVStream *st, |
| 697 |
AVCodecParserContext *pc, AVPacket *pkt) |
| 698 |
{
|
| 699 |
int frame_size;
|
| 700 |
|
| 701 |
*pnum = 0;
|
| 702 |
*pden = 0;
|
| 703 |
switch(st->codec->codec_type) {
|
| 704 |
case CODEC_TYPE_VIDEO:
|
| 705 |
if(st->time_base.num*1000LL > st->time_base.den){ |
| 706 |
*pnum = st->time_base.num; |
| 707 |
*pden = st->time_base.den; |
| 708 |
}else if(st->codec->time_base.num*1000LL > st->codec->time_base.den){ |
| 709 |
*pnum = st->codec->time_base.num; |
| 710 |
*pden = st->codec->time_base.den; |
| 711 |
if (pc && pc->repeat_pict) {
|
| 712 |
*pden *= 2;
|
| 713 |
*pnum = (*pnum) * (2 + pc->repeat_pict);
|
| 714 |
} |
| 715 |
} |
| 716 |
break;
|
| 717 |
case CODEC_TYPE_AUDIO:
|
| 718 |
frame_size = get_audio_frame_size(st->codec, pkt->size); |
| 719 |
if (frame_size < 0) |
| 720 |
break;
|
| 721 |
*pnum = frame_size; |
| 722 |
*pden = st->codec->sample_rate; |
| 723 |
break;
|
| 724 |
default:
|
| 725 |
break;
|
| 726 |
} |
| 727 |
} |
| 728 |
|
| 729 |
static int is_intra_only(AVCodecContext *enc){ |
| 730 |
if(enc->codec_type == CODEC_TYPE_AUDIO){
|
| 731 |
return 1; |
| 732 |
}else if(enc->codec_type == CODEC_TYPE_VIDEO){ |
| 733 |
switch(enc->codec_id){
|
| 734 |
case CODEC_ID_MJPEG:
|
| 735 |
case CODEC_ID_MJPEGB:
|
| 736 |
case CODEC_ID_LJPEG:
|
| 737 |
case CODEC_ID_RAWVIDEO:
|
| 738 |
case CODEC_ID_DVVIDEO:
|
| 739 |
case CODEC_ID_HUFFYUV:
|
| 740 |
case CODEC_ID_FFVHUFF:
|
| 741 |
case CODEC_ID_ASV1:
|
| 742 |
case CODEC_ID_ASV2:
|
| 743 |
case CODEC_ID_VCR1:
|
| 744 |
return 1; |
| 745 |
default: break; |
| 746 |
} |
| 747 |
} |
| 748 |
return 0; |
| 749 |
} |
| 750 |
|
| 751 |
static int64_t lsb2full(int64_t lsb, int64_t last_ts, int lsb_bits){ |
| 752 |
int64_t mask = lsb_bits < 64 ? (1LL<<lsb_bits)-1 : -1LL; |
| 753 |
int64_t delta= last_ts - mask/2;
|
| 754 |
return ((lsb - delta)&mask) + delta;
|
| 755 |
} |
| 756 |
|
| 757 |
static void compute_pkt_fields(AVFormatContext *s, AVStream *st, |
| 758 |
AVCodecParserContext *pc, AVPacket *pkt) |
| 759 |
{
|
| 760 |
int num, den, presentation_delayed;
|
| 761 |
/* handle wrapping */
|
| 762 |
if(st->cur_dts != AV_NOPTS_VALUE){
|
| 763 |
if(pkt->pts != AV_NOPTS_VALUE)
|
| 764 |
pkt->pts= lsb2full(pkt->pts, st->cur_dts, st->pts_wrap_bits); |
| 765 |
if(pkt->dts != AV_NOPTS_VALUE)
|
| 766 |
pkt->dts= lsb2full(pkt->dts, st->cur_dts, st->pts_wrap_bits); |
| 767 |
} |
| 768 |
|
| 769 |
if (pkt->duration == 0) { |
| 770 |
compute_frame_duration(&num, &den, st, pc, pkt); |
| 771 |
if (den && num) {
|
| 772 |
pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
|
| 773 |
} |
| 774 |
} |
| 775 |
|
| 776 |
if(is_intra_only(st->codec))
|
| 777 |
pkt->flags |= PKT_FLAG_KEY; |
| 778 |
|
| 779 |
/* do we have a video B frame ? */
|
| 780 |
presentation_delayed = 0;
|
| 781 |
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
| 782 |
/* XXX: need has_b_frame, but cannot get it if the codec is
|
| 783 |
not initialized */
|
| 784 |
if (( st->codec->codec_id == CODEC_ID_H264
|
| 785 |
|| st->codec->has_b_frames) && |
| 786 |
pc && pc->pict_type != FF_B_TYPE) |
| 787 |
presentation_delayed = 1;
|
| 788 |
/* this may be redundant, but it shouldnt hurt */
|
| 789 |
if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts > pkt->dts)
|
| 790 |
presentation_delayed = 1;
|
| 791 |
} |
| 792 |
|
| 793 |
if(st->cur_dts == AV_NOPTS_VALUE){
|
| 794 |
if(presentation_delayed) st->cur_dts = -pkt->duration;
|
| 795 |
else st->cur_dts = 0; |
| 796 |
} |
| 797 |
|
| 798 |
// av_log(NULL, AV_LOG_DEBUG, "IN delayed:%d pts:%lld, dts:%lld cur_dts:%lld st:%d pc:%p\n", presentation_delayed, pkt->pts, pkt->dts, st->cur_dts, pkt->stream_index, pc);
|
| 799 |
/* interpolate PTS and DTS if they are not present */
|
| 800 |
if (presentation_delayed) {
|
| 801 |
/* DTS = decompression time stamp */
|
| 802 |
/* PTS = presentation time stamp */
|
| 803 |
if (pkt->dts == AV_NOPTS_VALUE) {
|
| 804 |
/* if we know the last pts, use it */
|
| 805 |
if(st->last_IP_pts != AV_NOPTS_VALUE)
|
| 806 |
st->cur_dts = pkt->dts = st->last_IP_pts; |
| 807 |
else
|
| 808 |
pkt->dts = st->cur_dts; |
| 809 |
} else {
|
| 810 |
st->cur_dts = pkt->dts; |
| 811 |
} |
| 812 |
/* this is tricky: the dts must be incremented by the duration
|
| 813 |
of the frame we are displaying, i.e. the last I or P frame */
|
| 814 |
if (st->last_IP_duration == 0) |
| 815 |
st->cur_dts += pkt->duration; |
| 816 |
else
|
| 817 |
st->cur_dts += st->last_IP_duration; |
| 818 |
st->last_IP_duration = pkt->duration; |
| 819 |
st->last_IP_pts= pkt->pts; |
| 820 |
/* cannot compute PTS if not present (we can compute it only
|
| 821 |
by knowing the futur */
|
| 822 |
} else if(pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE || pkt->duration){ |
| 823 |
if(pkt->pts != AV_NOPTS_VALUE && pkt->duration){
|
| 824 |
int64_t old_diff= ABS(st->cur_dts - pkt->duration - pkt->pts); |
| 825 |
int64_t new_diff= ABS(st->cur_dts - pkt->pts); |
| 826 |
if(old_diff < new_diff && old_diff < (pkt->duration>>3)){ |
| 827 |
pkt->pts += pkt->duration; |
| 828 |
// av_log(NULL, AV_LOG_DEBUG, "id:%d old:%Ld new:%Ld dur:%d cur:%Ld size:%d\n", pkt->stream_index, old_diff, new_diff, pkt->duration, st->cur_dts, pkt->size);
|
| 829 |
} |
| 830 |
} |
| 831 |
|
| 832 |
/* presentation is not delayed : PTS and DTS are the same */
|
| 833 |
if (pkt->pts == AV_NOPTS_VALUE) {
|
| 834 |
if (pkt->dts == AV_NOPTS_VALUE) {
|
| 835 |
pkt->pts = st->cur_dts; |
| 836 |
pkt->dts = st->cur_dts; |
| 837 |
} |
| 838 |
else {
|
| 839 |
st->cur_dts = pkt->dts; |
| 840 |
pkt->pts = pkt->dts; |
| 841 |
} |
| 842 |
} else {
|
| 843 |
st->cur_dts = pkt->pts; |
| 844 |
pkt->dts = pkt->pts; |
| 845 |
} |
| 846 |
st->cur_dts += pkt->duration; |
| 847 |
} |
| 848 |
// av_log(NULL, AV_LOG_DEBUG, "OUTdelayed:%d pts:%lld, dts:%lld cur_dts:%lld\n", presentation_delayed, pkt->pts, pkt->dts, st->cur_dts);
|
| 849 |
|
| 850 |
/* update flags */
|
| 851 |
if (pc) {
|
| 852 |
pkt->flags = 0;
|
| 853 |
/* key frame computation */
|
| 854 |
switch(st->codec->codec_type) {
|
| 855 |
case CODEC_TYPE_VIDEO:
|
| 856 |
if (pc->pict_type == FF_I_TYPE)
|
| 857 |
pkt->flags |= PKT_FLAG_KEY; |
| 858 |
break;
|
| 859 |
case CODEC_TYPE_AUDIO:
|
| 860 |
pkt->flags |= PKT_FLAG_KEY; |
| 861 |
break;
|
| 862 |
default:
|
| 863 |
break;
|
| 864 |
} |
| 865 |
} |
| 866 |
} |
| 867 |
|
| 868 |
void av_destruct_packet_nofree(AVPacket *pkt)
|
| 869 |
{
|
| 870 |
pkt->data = NULL; pkt->size = 0; |
| 871 |
} |
| 872 |
|
| 873 |
static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt) |
| 874 |
{
|
| 875 |
AVStream *st; |
| 876 |
int len, ret, i;
|
| 877 |
|
| 878 |
for(;;) {
|
| 879 |
/* select current input stream component */
|
| 880 |
st = s->cur_st; |
| 881 |
if (st) {
|
| 882 |
if (!st->need_parsing || !st->parser) {
|
| 883 |
/* no parsing needed: we just output the packet as is */
|
| 884 |
/* raw data support */
|
| 885 |
*pkt = s->cur_pkt; |
| 886 |
compute_pkt_fields(s, st, NULL, pkt);
|
| 887 |
s->cur_st = NULL;
|
| 888 |
return 0; |
| 889 |
} else if (s->cur_len > 0 && st->discard < AVDISCARD_ALL) { |
| 890 |
len = av_parser_parse(st->parser, st->codec, &pkt->data, &pkt->size, |
| 891 |
s->cur_ptr, s->cur_len, |
| 892 |
s->cur_pkt.pts, s->cur_pkt.dts); |
| 893 |
s->cur_pkt.pts = AV_NOPTS_VALUE; |
| 894 |
s->cur_pkt.dts = AV_NOPTS_VALUE; |
| 895 |
/* increment read pointer */
|
| 896 |
s->cur_ptr += len; |
| 897 |
s->cur_len -= len; |
| 898 |
|
| 899 |
/* return packet if any */
|
| 900 |
if (pkt->size) {
|
| 901 |
got_packet:
|
| 902 |
pkt->duration = 0;
|
| 903 |
pkt->stream_index = st->index; |
| 904 |
pkt->pts = st->parser->pts; |
| 905 |
pkt->dts = st->parser->dts; |
| 906 |
pkt->destruct = av_destruct_packet_nofree; |
| 907 |
compute_pkt_fields(s, st, st->parser, pkt); |
| 908 |
return 0; |
| 909 |
} |
| 910 |
} else {
|
| 911 |
/* free packet */
|
| 912 |
av_free_packet(&s->cur_pkt); |
| 913 |
s->cur_st = NULL;
|
| 914 |
} |
| 915 |
} else {
|
| 916 |
/* read next packet */
|
| 917 |
ret = av_read_packet(s, &s->cur_pkt); |
| 918 |
if (ret < 0) { |
| 919 |
if (ret == -EAGAIN)
|
| 920 |
return ret;
|
| 921 |
/* return the last frames, if any */
|
| 922 |
for(i = 0; i < s->nb_streams; i++) { |
| 923 |
st = s->streams[i]; |
| 924 |
if (st->parser && st->need_parsing) {
|
| 925 |
av_parser_parse(st->parser, st->codec, |
| 926 |
&pkt->data, &pkt->size, |
| 927 |
NULL, 0, |
| 928 |
AV_NOPTS_VALUE, AV_NOPTS_VALUE); |
| 929 |
if (pkt->size)
|
| 930 |
goto got_packet;
|
| 931 |
} |
| 932 |
} |
| 933 |
/* no more packets: really terminates parsing */
|
| 934 |
return ret;
|
| 935 |
} |
| 936 |
|
| 937 |
st = s->streams[s->cur_pkt.stream_index]; |
| 938 |
|
| 939 |
s->cur_st = st; |
| 940 |
s->cur_ptr = s->cur_pkt.data; |
| 941 |
s->cur_len = s->cur_pkt.size; |
| 942 |
if (st->need_parsing && !st->parser) {
|
| 943 |
st->parser = av_parser_init(st->codec->codec_id); |
| 944 |
if (!st->parser) {
|
| 945 |
/* no parser available : just output the raw packets */
|
| 946 |
st->need_parsing = 0;
|
| 947 |
}else if(st->need_parsing == 2){ |
| 948 |
st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES; |
| 949 |
} |
| 950 |
} |
| 951 |
} |
| 952 |
} |
| 953 |
} |
| 954 |
|
| 955 |
/**
|
| 956 |
* Return the next frame of a stream.
|
| 957 |
*
|
| 958 |
* The returned packet is valid
|
| 959 |
* until the next av_read_frame() or until av_close_input_file() and
|
| 960 |
* must be freed with av_free_packet. For video, the packet contains
|
| 961 |
* exactly one frame. For audio, it contains an integer number of
|
| 962 |
* frames if each frame has a known fixed size (e.g. PCM or ADPCM
|
| 963 |
* data). If the audio frames have a variable size (e.g. MPEG audio),
|
| 964 |
* then it contains one frame.
|
| 965 |
*
|
| 966 |
* pkt->pts, pkt->dts and pkt->duration are always set to correct
|
| 967 |
* values in AV_TIME_BASE unit (and guessed if the format cannot
|
| 968 |
* provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
|
| 969 |
* has B frames, so it is better to rely on pkt->dts if you do not
|
| 970 |
* decompress the payload.
|
| 971 |
*
|
| 972 |
* @return 0 if OK, < 0 if error or end of file.
|
| 973 |
*/
|
| 974 |
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
|
| 975 |
{
|
| 976 |
AVPacketList *pktl; |
| 977 |
int eof=0; |
| 978 |
const int genpts= s->flags & AVFMT_FLAG_GENPTS; |
| 979 |
|
| 980 |
for(;;){
|
| 981 |
pktl = s->packet_buffer; |
| 982 |
if (pktl) {
|
| 983 |
AVPacket *next_pkt= &pktl->pkt; |
| 984 |
|
| 985 |
if(genpts && next_pkt->dts != AV_NOPTS_VALUE){
|
| 986 |
while(pktl && next_pkt->pts == AV_NOPTS_VALUE){
|
| 987 |
if( pktl->pkt.stream_index == next_pkt->stream_index
|
| 988 |
&& next_pkt->dts < pktl->pkt.dts |
| 989 |
&& pktl->pkt.pts != pktl->pkt.dts //not b frame
|
| 990 |
/*&& pktl->pkt.dts != AV_NOPTS_VALUE*/){
|
| 991 |
next_pkt->pts= pktl->pkt.dts; |
| 992 |
} |
| 993 |
pktl= pktl->next; |
| 994 |
} |
| 995 |
pktl = s->packet_buffer; |
| 996 |
} |
| 997 |
|
| 998 |
if( next_pkt->pts != AV_NOPTS_VALUE
|
| 999 |
|| next_pkt->dts == AV_NOPTS_VALUE |
| 1000 |
|| !genpts || eof){
|
| 1001 |
/* read packet from packet buffer, if there is data */
|
| 1002 |
*pkt = *next_pkt; |
| 1003 |
s->packet_buffer = pktl->next; |
| 1004 |
av_free(pktl); |
| 1005 |
return 0; |
| 1006 |
} |
| 1007 |
} |
| 1008 |
if(genpts){
|
| 1009 |
AVPacketList **plast_pktl= &s->packet_buffer; |
| 1010 |
int ret= av_read_frame_internal(s, pkt);
|
| 1011 |
if(ret<0){ |
| 1012 |
if(pktl && ret != -EAGAIN){
|
| 1013 |
eof=1;
|
| 1014 |
continue;
|
| 1015 |
}else
|
| 1016 |
return ret;
|
| 1017 |
} |
| 1018 |
|
| 1019 |
/* duplicate the packet */
|
| 1020 |
if (av_dup_packet(pkt) < 0) |
| 1021 |
return AVERROR_NOMEM;
|
| 1022 |
|
| 1023 |
while(*plast_pktl) plast_pktl= &(*plast_pktl)->next; //FIXME maybe maintain pointer to the last? |
| 1024 |
|
| 1025 |
pktl = av_mallocz(sizeof(AVPacketList));
|
| 1026 |
if (!pktl)
|
| 1027 |
return AVERROR_NOMEM;
|
| 1028 |
|
| 1029 |
/* add the packet in the buffered packet list */
|
| 1030 |
*plast_pktl = pktl; |
| 1031 |
pktl->pkt= *pkt; |
| 1032 |
}else{
|
| 1033 |
assert(!s->packet_buffer); |
| 1034 |
return av_read_frame_internal(s, pkt);
|
| 1035 |
} |
| 1036 |
} |
| 1037 |
} |
| 1038 |
|
| 1039 |
/* XXX: suppress the packet queue */
|
| 1040 |
static void flush_packet_queue(AVFormatContext *s) |
| 1041 |
{
|
| 1042 |
AVPacketList *pktl; |
| 1043 |
|
| 1044 |
for(;;) {
|
| 1045 |
pktl = s->packet_buffer; |
| 1046 |
if (!pktl)
|
| 1047 |
break;
|
| 1048 |
s->packet_buffer = pktl->next; |
| 1049 |
av_free_packet(&pktl->pkt); |
| 1050 |
av_free(pktl); |
| 1051 |
} |
| 1052 |
} |
| 1053 |
|
| 1054 |
/*******************************************************/
|
| 1055 |
/* seek support */
|
| 1056 |
|
| 1057 |
int av_find_default_stream_index(AVFormatContext *s)
|
| 1058 |
{
|
| 1059 |
int i;
|
| 1060 |
AVStream *st; |
| 1061 |
|
| 1062 |
if (s->nb_streams <= 0) |
| 1063 |
return -1; |
| 1064 |
for(i = 0; i < s->nb_streams; i++) { |
| 1065 |
st = s->streams[i]; |
| 1066 |
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
| 1067 |
return i;
|
| 1068 |
} |
| 1069 |
} |
| 1070 |
return 0; |
| 1071 |
} |
| 1072 |
|
| 1073 |
/**
|
| 1074 |
* Flush the frame reader.
|
| 1075 |
*/
|
| 1076 |
static void av_read_frame_flush(AVFormatContext *s) |
| 1077 |
{
|
| 1078 |
AVStream *st; |
| 1079 |
int i;
|
| 1080 |
|
| 1081 |
flush_packet_queue(s); |
| 1082 |
|
| 1083 |
/* free previous packet */
|
| 1084 |
if (s->cur_st) {
|
| 1085 |
if (s->cur_st->parser)
|
| 1086 |
av_free_packet(&s->cur_pkt); |
| 1087 |
s->cur_st = NULL;
|
| 1088 |
} |
| 1089 |
/* fail safe */
|
| 1090 |
s->cur_ptr = NULL;
|
| 1091 |
s->cur_len = 0;
|
| 1092 |
|
| 1093 |
/* for each stream, reset read state */
|
| 1094 |
for(i = 0; i < s->nb_streams; i++) { |
| 1095 |
st = s->streams[i]; |
| 1096 |
|
| 1097 |
if (st->parser) {
|
| 1098 |
av_parser_close(st->parser); |
| 1099 |
st->parser = NULL;
|
| 1100 |
} |
| 1101 |
st->last_IP_pts = AV_NOPTS_VALUE; |
| 1102 |
st->cur_dts = 0; /* we set the current DTS to an unspecified origin */ |
| 1103 |
} |
| 1104 |
} |
| 1105 |
|
| 1106 |
/**
|
| 1107 |
* Updates cur_dts of all streams based on given timestamp and AVStream.
|
| 1108 |
*
|
| 1109 |
* Stream ref_st unchanged, others set cur_dts in their native timebase
|
| 1110 |
* only needed for timestamp wrapping or if (dts not set and pts!=dts)
|
| 1111 |
* @param timestamp new dts expressed in time_base of param ref_st
|
| 1112 |
* @param ref_st reference stream giving time_base of param timestamp
|
| 1113 |
*/
|
| 1114 |
static void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp){ |
| 1115 |
int i;
|
| 1116 |
|
| 1117 |
for(i = 0; i < s->nb_streams; i++) { |
| 1118 |
AVStream *st = s->streams[i]; |
| 1119 |
|
| 1120 |
st->cur_dts = av_rescale(timestamp, |
| 1121 |
st->time_base.den * (int64_t)ref_st->time_base.num, |
| 1122 |
st->time_base.num * (int64_t)ref_st->time_base.den); |
| 1123 |
} |
| 1124 |
} |
| 1125 |
|
| 1126 |
/**
|
| 1127 |
* Add a index entry into a sorted list updateing if it is already there.
|
| 1128 |
*
|
| 1129 |
* @param timestamp timestamp in the timebase of the given stream
|
| 1130 |
*/
|
| 1131 |
int av_add_index_entry(AVStream *st,
|
| 1132 |
int64_t pos, int64_t timestamp, int distance, int flags) |
| 1133 |
{
|
| 1134 |
AVIndexEntry *entries, *ie; |
| 1135 |
int index;
|
| 1136 |
|
| 1137 |
if((unsigned)st->nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry)) |
| 1138 |
return -1; |
| 1139 |
|
| 1140 |
entries = av_fast_realloc(st->index_entries, |
| 1141 |
&st->index_entries_allocated_size, |
| 1142 |
(st->nb_index_entries + 1) *
|
| 1143 |
sizeof(AVIndexEntry));
|
| 1144 |
if(!entries)
|
| 1145 |
return -1; |
| 1146 |
|
| 1147 |
st->index_entries= entries; |
| 1148 |
|
| 1149 |
index= av_index_search_timestamp(st, timestamp, AVSEEK_FLAG_ANY); |
| 1150 |
|
| 1151 |
if(index<0){ |
| 1152 |
index= st->nb_index_entries++; |
| 1153 |
ie= &entries[index]; |
| 1154 |
assert(index==0 || ie[-1].timestamp < timestamp); |
| 1155 |
}else{
|
| 1156 |
ie= &entries[index]; |
| 1157 |
if(ie->timestamp != timestamp){
|
| 1158 |
if(ie->timestamp <= timestamp)
|
| 1159 |
return -1; |
| 1160 |
memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index)); |
| 1161 |
st->nb_index_entries++; |
| 1162 |
}else if(ie->pos == pos && distance < ie->min_distance) //dont reduce the distance |
| 1163 |
distance= ie->min_distance; |
| 1164 |
} |
| 1165 |
|
| 1166 |
ie->pos = pos; |
| 1167 |
ie->timestamp = timestamp; |
| 1168 |
ie->min_distance= distance; |
| 1169 |
ie->flags = flags; |
| 1170 |
|
| 1171 |
return index;
|
| 1172 |
} |
| 1173 |
|
| 1174 |
/**
|
| 1175 |
* build an index for raw streams using a parser.
|
| 1176 |
*/
|
| 1177 |
static void av_build_index_raw(AVFormatContext *s) |
| 1178 |
{
|
| 1179 |
AVPacket pkt1, *pkt = &pkt1; |
| 1180 |
int ret;
|
| 1181 |
AVStream *st; |
| 1182 |
|
| 1183 |
st = s->streams[0];
|
| 1184 |
av_read_frame_flush(s); |
| 1185 |
url_fseek(&s->pb, s->data_offset, SEEK_SET); |
| 1186 |
|
| 1187 |
for(;;) {
|
| 1188 |
ret = av_read_frame(s, pkt); |
| 1189 |
if (ret < 0) |
| 1190 |
break;
|
| 1191 |
if (pkt->stream_index == 0 && st->parser && |
| 1192 |
(pkt->flags & PKT_FLAG_KEY)) {
|
| 1193 |
av_add_index_entry(st, st->parser->frame_offset, pkt->dts, |
| 1194 |
0, AVINDEX_KEYFRAME);
|
| 1195 |
} |
| 1196 |
av_free_packet(pkt); |
| 1197 |
} |
| 1198 |
} |
| 1199 |
|
| 1200 |
/**
|
| 1201 |
* Returns TRUE if we deal with a raw stream.
|
| 1202 |
*
|
| 1203 |
* Raw codec data and parsing needed.
|
| 1204 |
*/
|
| 1205 |
static int is_raw_stream(AVFormatContext *s) |
| 1206 |
{
|
| 1207 |
AVStream *st; |
| 1208 |
|
| 1209 |
if (s->nb_streams != 1) |
| 1210 |
return 0; |
| 1211 |
st = s->streams[0];
|
| 1212 |
if (!st->need_parsing)
|
| 1213 |
return 0; |
| 1214 |
return 1; |
| 1215 |
} |
| 1216 |
|
| 1217 |
/**
|
| 1218 |
* Gets the index for a specific timestamp.
|
| 1219 |
* @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
|
| 1220 |
* the timestamp which is <= the requested one, if backward is 0
|
| 1221 |
* then it will be >=
|
| 1222 |
* if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
|
| 1223 |
* @return < 0 if no such timestamp could be found
|
| 1224 |
*/
|
| 1225 |
int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp,
|
| 1226 |
int flags)
|
| 1227 |
{
|
| 1228 |
AVIndexEntry *entries= st->index_entries; |
| 1229 |
int nb_entries= st->nb_index_entries;
|
| 1230 |
int a, b, m;
|
| 1231 |
int64_t timestamp; |
| 1232 |
|
| 1233 |
a = - 1;
|
| 1234 |
b = nb_entries; |
| 1235 |
|
| 1236 |
while (b - a > 1) { |
| 1237 |
m = (a + b) >> 1;
|
| 1238 |
timestamp = entries[m].timestamp; |
| 1239 |
if(timestamp >= wanted_timestamp)
|
| 1240 |
b = m; |
| 1241 |
if(timestamp <= wanted_timestamp)
|
| 1242 |
a = m; |
| 1243 |
} |
| 1244 |
m= (flags & AVSEEK_FLAG_BACKWARD) ? a : b; |
| 1245 |
|
| 1246 |
if(!(flags & AVSEEK_FLAG_ANY)){
|
| 1247 |
while(m>=0 && m<nb_entries && !(entries[m].flags & AVINDEX_KEYFRAME)){ |
| 1248 |
m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1; |
| 1249 |
} |
| 1250 |
} |
| 1251 |
|
| 1252 |
if(m == nb_entries)
|
| 1253 |
return -1; |
| 1254 |
return m;
|
| 1255 |
} |
| 1256 |
|
| 1257 |
#define DEBUG_SEEK
|
| 1258 |
|
| 1259 |
/**
|
| 1260 |
* Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
|
| 1261 |
* this isnt supposed to be called directly by a user application, but by demuxers
|
| 1262 |
* @param target_ts target timestamp in the time base of the given stream
|
| 1263 |
* @param stream_index stream number
|
| 1264 |
*/
|
| 1265 |
int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){ |
| 1266 |
AVInputFormat *avif= s->iformat; |
| 1267 |
int64_t pos_min, pos_max, pos, pos_limit; |
| 1268 |
int64_t ts_min, ts_max, ts; |
| 1269 |
int64_t start_pos, filesize; |
| 1270 |
int index, no_change;
|
| 1271 |
AVStream *st; |
| 1272 |
|
| 1273 |
if (stream_index < 0) |
| 1274 |
return -1; |
| 1275 |
|
| 1276 |
#ifdef DEBUG_SEEK
|
| 1277 |
av_log(s, AV_LOG_DEBUG, "read_seek: %d %"PRId64"\n", stream_index, target_ts); |
| 1278 |
#endif
|
| 1279 |
|
| 1280 |
ts_max= |
| 1281 |
ts_min= AV_NOPTS_VALUE; |
| 1282 |
pos_limit= -1; //gcc falsely says it may be uninitalized |
| 1283 |
|
| 1284 |
st= s->streams[stream_index]; |
| 1285 |
if(st->index_entries){
|
| 1286 |
AVIndexEntry *e; |
| 1287 |
|
| 1288 |
index= av_index_search_timestamp(st, target_ts, flags | AVSEEK_FLAG_BACKWARD); //FIXME whole func must be checked for non keyframe entries in index case, especially read_timestamp()
|
| 1289 |
index= FFMAX(index, 0);
|
| 1290 |
e= &st->index_entries[index]; |
| 1291 |
|
| 1292 |
if(e->timestamp <= target_ts || e->pos == e->min_distance){
|
| 1293 |
pos_min= e->pos; |
| 1294 |
ts_min= e->timestamp; |
| 1295 |
#ifdef DEBUG_SEEK
|
| 1296 |
av_log(s, AV_LOG_DEBUG, "using cached pos_min=0x%"PRIx64" dts_min=%"PRId64"\n", |
| 1297 |
pos_min,ts_min); |
| 1298 |
#endif
|
| 1299 |
}else{
|
| 1300 |
assert(index==0);
|
| 1301 |
} |
| 1302 |
|
| 1303 |
index= av_index_search_timestamp(st, target_ts, flags & ~AVSEEK_FLAG_BACKWARD); |
| 1304 |
assert(index < st->nb_index_entries); |
| 1305 |
if(index >= 0){ |
| 1306 |
e= &st->index_entries[index]; |
| 1307 |
assert(e->timestamp >= target_ts); |
| 1308 |
pos_max= e->pos; |
| 1309 |
ts_max= e->timestamp; |
| 1310 |
pos_limit= pos_max - e->min_distance; |
| 1311 |
#ifdef DEBUG_SEEK
|
| 1312 |
av_log(s, AV_LOG_DEBUG, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64" dts_max=%"PRId64"\n", |
| 1313 |
pos_max,pos_limit, ts_max); |
| 1314 |
#endif
|
| 1315 |
} |
| 1316 |
} |
| 1317 |
|
| 1318 |
if(ts_min == AV_NOPTS_VALUE){
|
| 1319 |
pos_min = s->data_offset; |
| 1320 |
ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX); |
| 1321 |
if (ts_min == AV_NOPTS_VALUE)
|
| 1322 |
return -1; |
| 1323 |
} |
| 1324 |
|
| 1325 |
if(ts_max == AV_NOPTS_VALUE){
|
| 1326 |
int step= 1024; |
| 1327 |
filesize = url_fsize(&s->pb); |
| 1328 |
pos_max = filesize - 1;
|
| 1329 |
do{
|
| 1330 |
pos_max -= step; |
| 1331 |
ts_max = avif->read_timestamp(s, stream_index, &pos_max, pos_max + step); |
| 1332 |
step += step; |
| 1333 |
}while(ts_max == AV_NOPTS_VALUE && pos_max >= step);
|
| 1334 |
if (ts_max == AV_NOPTS_VALUE)
|
| 1335 |
return -1; |
| 1336 |
|
| 1337 |
for(;;){
|
| 1338 |
int64_t tmp_pos= pos_max + 1;
|
| 1339 |
int64_t tmp_ts= avif->read_timestamp(s, stream_index, &tmp_pos, INT64_MAX); |
| 1340 |
if(tmp_ts == AV_NOPTS_VALUE)
|
| 1341 |
break;
|
| 1342 |
ts_max= tmp_ts; |
| 1343 |
pos_max= tmp_pos; |
| 1344 |
if(tmp_pos >= filesize)
|
| 1345 |
break;
|
| 1346 |
} |
| 1347 |
pos_limit= pos_max; |
| 1348 |
} |
| 1349 |
|
| 1350 |
no_change=0;
|
| 1351 |
while (pos_min < pos_limit) {
|
| 1352 |
#ifdef DEBUG_SEEK
|
| 1353 |
av_log(s, AV_LOG_DEBUG, "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%"PRId64" dts_max=%"PRId64"\n", |
| 1354 |
pos_min, pos_max, |
| 1355 |
ts_min, ts_max); |
| 1356 |
#endif
|
| 1357 |
assert(pos_limit <= pos_max); |
| 1358 |
|
| 1359 |
if(no_change==0){ |
| 1360 |
int64_t approximate_keyframe_distance= pos_max - pos_limit; |
| 1361 |
// interpolate position (better than dichotomy)
|
| 1362 |
pos = av_rescale(target_ts - ts_min, pos_max - pos_min, ts_max - ts_min) |
| 1363 |
+ pos_min - approximate_keyframe_distance; |
| 1364 |
}else if(no_change==1){ |
| 1365 |
// bisection, if interpolation failed to change min or max pos last time
|
| 1366 |
pos = (pos_min + pos_limit)>>1;
|
| 1367 |
}else{
|
| 1368 |
// linear search if bisection failed, can only happen if there are very few or no keframes between min/max
|
| 1369 |
pos=pos_min; |
| 1370 |
} |
| 1371 |
if(pos <= pos_min)
|
| 1372 |
pos= pos_min + 1;
|
| 1373 |
else if(pos > pos_limit) |
| 1374 |
pos= pos_limit; |
| 1375 |
start_pos= pos; |
| 1376 |
|
| 1377 |
ts = avif->read_timestamp(s, stream_index, &pos, INT64_MAX); //may pass pos_limit instead of -1
|
| 1378 |
if(pos == pos_max)
|
| 1379 |
no_change++; |
| 1380 |
else
|
| 1381 |
no_change=0;
|
| 1382 |
#ifdef DEBUG_SEEK
|
| 1383 |
av_log(s, AV_LOG_DEBUG, "%"PRId64" %"PRId64" %"PRId64" / %"PRId64" %"PRId64" %"PRId64" target:%"PRId64" limit:%"PRId64" start:%"PRId64" noc:%d\n", pos_min, pos, pos_max, ts_min, ts, ts_max, target_ts, pos_limit, start_pos, no_change); |
| 1384 |
#endif
|
| 1385 |
assert(ts != AV_NOPTS_VALUE); |
| 1386 |
if (target_ts <= ts) {
|
| 1387 |
pos_limit = start_pos - 1;
|
| 1388 |
pos_max = pos; |
| 1389 |
ts_max = ts; |
| 1390 |
} |
| 1391 |
if (target_ts >= ts) {
|
| 1392 |
pos_min = pos; |
| 1393 |
ts_min = ts; |
| 1394 |
} |
| 1395 |
} |
| 1396 |
|
| 1397 |
pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max; |
| 1398 |
ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max; |
| 1399 |
#ifdef DEBUG_SEEK
|
| 1400 |
pos_min = pos; |
| 1401 |
ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX); |
| 1402 |
pos_min++; |
| 1403 |
ts_max = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX); |
| 1404 |
av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" %"PRId64"<=%"PRId64"<=%"PRId64"\n", |
| 1405 |
pos, ts_min, target_ts, ts_max); |
| 1406 |
#endif
|
| 1407 |
/* do the seek */
|
| 1408 |
url_fseek(&s->pb, pos, SEEK_SET); |
| 1409 |
|
| 1410 |
av_update_cur_dts(s, st, ts); |
| 1411 |
|
| 1412 |
return 0; |
| 1413 |
} |
| 1414 |
|
| 1415 |
static int av_seek_frame_byte(AVFormatContext *s, int stream_index, int64_t pos, int flags){ |
| 1416 |
int64_t pos_min, pos_max; |
| 1417 |
#if 0
|
| 1418 |
AVStream *st;
|
| 1419 |
|
| 1420 |
if (stream_index < 0)
|
| 1421 |
return -1;
|
| 1422 |
|
| 1423 |
st= s->streams[stream_index];
|
| 1424 |
#endif
|
| 1425 |
|
| 1426 |
pos_min = s->data_offset; |
| 1427 |
pos_max = url_fsize(&s->pb) - 1;
|
| 1428 |
|
| 1429 |
if (pos < pos_min) pos= pos_min;
|
| 1430 |
else if(pos > pos_max) pos= pos_max; |
| 1431 |
|
| 1432 |
url_fseek(&s->pb, pos, SEEK_SET); |
| 1433 |
|
| 1434 |
#if 0
|
| 1435 |
av_update_cur_dts(s, st, ts);
|
| 1436 |
#endif
|
| 1437 |
return 0; |
| 1438 |
} |
| 1439 |
|
| 1440 |
static int av_seek_frame_generic(AVFormatContext *s, |
| 1441 |
int stream_index, int64_t timestamp, int flags) |
| 1442 |
{
|
| 1443 |
int index;
|
| 1444 |
AVStream *st; |
| 1445 |
AVIndexEntry *ie; |
| 1446 |
|
| 1447 |
if (!s->index_built) {
|
| 1448 |
if (is_raw_stream(s)) {
|
| 1449 |
av_build_index_raw(s); |
| 1450 |
} else {
|
| 1451 |
return -1; |
| 1452 |
} |
| 1453 |
s->index_built = 1;
|
| 1454 |
} |
| 1455 |
|
| 1456 |
st = s->streams[stream_index]; |
| 1457 |
index = av_index_search_timestamp(st, timestamp, flags); |
| 1458 |
if (index < 0) |
| 1459 |
return -1; |
| 1460 |
|
| 1461 |
/* now we have found the index, we can seek */
|
| 1462 |
ie = &st->index_entries[index]; |
| 1463 |
av_read_frame_flush(s); |
| 1464 |
url_fseek(&s->pb, ie->pos, SEEK_SET); |
| 1465 |
|
| 1466 |
av_update_cur_dts(s, st, ie->timestamp); |
| 1467 |
|
| 1468 |
return 0; |
| 1469 |
} |
| 1470 |
|
| 1471 |
/**
|
| 1472 |
* Seek to the key frame at timestamp.
|
| 1473 |
* 'timestamp' in 'stream_index'.
|
| 1474 |
* @param stream_index If stream_index is (-1), a default
|
| 1475 |
* stream is selected, and timestamp is automatically converted
|
| 1476 |
* from AV_TIME_BASE units to the stream specific time_base.
|
| 1477 |
* @param timestamp timestamp in AVStream.time_base units
|
| 1478 |
* or if there is no stream specified then in AV_TIME_BASE units
|
| 1479 |
* @param flags flags which select direction and seeking mode
|
| 1480 |
* @return >= 0 on success
|
| 1481 |
*/
|
| 1482 |
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
| 1483 |
{
|
| 1484 |
int ret;
|
| 1485 |
AVStream *st; |
| 1486 |
|
| 1487 |
av_read_frame_flush(s); |
| 1488 |
|
| 1489 |
if(flags & AVSEEK_FLAG_BYTE)
|
| 1490 |
return av_seek_frame_byte(s, stream_index, timestamp, flags);
|
| 1491 |
|
| 1492 |
if(stream_index < 0){ |
| 1493 |
stream_index= av_find_default_stream_index(s); |
| 1494 |
if(stream_index < 0) |
| 1495 |
return -1; |
| 1496 |
|
| 1497 |
st= s->streams[stream_index]; |
| 1498 |
/* timestamp for default must be expressed in AV_TIME_BASE units */
|
| 1499 |
timestamp = av_rescale(timestamp, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num); |
| 1500 |
} |
| 1501 |
st= s->streams[stream_index]; |
| 1502 |
|
| 1503 |
/* first, we try the format specific seek */
|
| 1504 |
if (s->iformat->read_seek)
|
| 1505 |
ret = s->iformat->read_seek(s, stream_index, timestamp, flags); |
| 1506 |
else
|
| 1507 |
ret = -1;
|
| 1508 |
if (ret >= 0) { |
| 1509 |
return 0; |
| 1510 |
} |
| 1511 |
|
| 1512 |
if(s->iformat->read_timestamp)
|
| 1513 |
return av_seek_frame_binary(s, stream_index, timestamp, flags);
|
| 1514 |
else
|
| 1515 |
return av_seek_frame_generic(s, stream_index, timestamp, flags);
|
| 1516 |
} |
| 1517 |
|
| 1518 |
/*******************************************************/
|
| 1519 |
|
| 1520 |
/**
|
| 1521 |
* Returns TRUE if the stream has accurate timings in any stream.
|
| 1522 |
*
|
| 1523 |
* @return TRUE if the stream has accurate timings for at least one component.
|
| 1524 |
*/
|
| 1525 |
static int av_has_timings(AVFormatContext *ic) |
| 1526 |
{
|
| 1527 |
int i;
|
| 1528 |
AVStream *st; |
| 1529 |
|
| 1530 |
for(i = 0;i < ic->nb_streams; i++) { |
| 1531 |
st = ic->streams[i]; |
| 1532 |
if (st->start_time != AV_NOPTS_VALUE &&
|
| 1533 |
st->duration != AV_NOPTS_VALUE) |
| 1534 |
return 1; |
| 1535 |
} |
| 1536 |
return 0; |
| 1537 |
} |
| 1538 |
|
| 1539 |
/**
|
| 1540 |
* Estimate the stream timings from the one of each components.
|
| 1541 |
*
|
| 1542 |
* Also computes the global bitrate if possible.
|
| 1543 |
*/
|
| 1544 |
static void av_update_stream_timings(AVFormatContext *ic) |
| 1545 |
{
|
| 1546 |
int64_t start_time, start_time1, end_time, end_time1; |
| 1547 |
int i;
|
| 1548 |
AVStream *st; |
| 1549 |
|
| 1550 |
start_time = MAXINT64; |
| 1551 |
end_time = MININT64; |
| 1552 |
for(i = 0;i < ic->nb_streams; i++) { |
| 1553 |
st = ic->streams[i]; |
| 1554 |
if (st->start_time != AV_NOPTS_VALUE) {
|
| 1555 |
start_time1= av_rescale_q(st->start_time, st->time_base, AV_TIME_BASE_Q); |
| 1556 |
if (start_time1 < start_time)
|
| 1557 |
start_time = start_time1; |
| 1558 |
if (st->duration != AV_NOPTS_VALUE) {
|
| 1559 |
end_time1 = start_time1 |
| 1560 |
+ av_rescale_q(st->duration, st->time_base, AV_TIME_BASE_Q); |
| 1561 |
if (end_time1 > end_time)
|
| 1562 |
end_time = end_time1; |
| 1563 |
} |
| 1564 |
} |
| 1565 |
} |
| 1566 |
if (start_time != MAXINT64) {
|
| 1567 |
ic->start_time = start_time; |
| 1568 |
if (end_time != MININT64) {
|
| 1569 |
ic->duration = end_time - start_time; |
| 1570 |
if (ic->file_size > 0) { |
| 1571 |
/* compute the bit rate */
|
| 1572 |
ic->bit_rate = (double)ic->file_size * 8.0 * AV_TIME_BASE / |
| 1573 |
(double)ic->duration;
|
| 1574 |
} |
| 1575 |
} |
| 1576 |
} |
| 1577 |
|
| 1578 |
} |
| 1579 |
|
| 1580 |
static void fill_all_stream_timings(AVFormatContext *ic) |
| 1581 |
{
|
| 1582 |
int i;
|
| 1583 |
AVStream *st; |
| 1584 |
|
| 1585 |
av_update_stream_timings(ic); |
| 1586 |
for(i = 0;i < ic->nb_streams; i++) { |
| 1587 |
st = ic->streams[i]; |
| 1588 |
if (st->start_time == AV_NOPTS_VALUE) {
|
| 1589 |
if(ic->start_time != AV_NOPTS_VALUE)
|
| 1590 |
st->start_time = av_rescale_q(ic->start_time, AV_TIME_BASE_Q, st->time_base); |
| 1591 |
if(ic->duration != AV_NOPTS_VALUE)
|
| 1592 |
st->duration = av_rescale_q(ic->duration, AV_TIME_BASE_Q, st->time_base); |
| 1593 |
} |
| 1594 |
} |
| 1595 |
} |
| 1596 |
|
| 1597 |
static void av_estimate_timings_from_bit_rate(AVFormatContext *ic) |
| 1598 |
{
|
| 1599 |
int64_t filesize, duration; |
| 1600 |
int bit_rate, i;
|
| 1601 |
AVStream *st; |
| 1602 |
|
| 1603 |
/* if bit_rate is already set, we believe it */
|
| 1604 |
if (ic->bit_rate == 0) { |
| 1605 |
bit_rate = 0;
|
| 1606 |
for(i=0;i<ic->nb_streams;i++) { |
| 1607 |
st = ic->streams[i]; |
| 1608 |
bit_rate += st->codec->bit_rate; |
| 1609 |
} |
| 1610 |
ic->bit_rate = bit_rate; |
| 1611 |
} |
| 1612 |
|
| 1613 |
/* if duration is already set, we believe it */
|
| 1614 |
if (ic->duration == AV_NOPTS_VALUE &&
|
| 1615 |
ic->bit_rate != 0 &&
|
| 1616 |
ic->file_size != 0) {
|
| 1617 |
filesize = ic->file_size; |
| 1618 |
if (filesize > 0) { |
| 1619 |
for(i = 0; i < ic->nb_streams; i++) { |
| 1620 |
st = ic->streams[i]; |
| 1621 |
duration= av_rescale(8*filesize, st->time_base.den, ic->bit_rate*(int64_t)st->time_base.num);
|
| 1622 |
if (st->start_time == AV_NOPTS_VALUE ||
|
| 1623 |
st->duration == AV_NOPTS_VALUE) {
|
| 1624 |
st->start_time = 0;
|
| 1625 |
st->duration = duration; |
| 1626 |
} |
| 1627 |
} |
| 1628 |
} |
| 1629 |
} |
| 1630 |
} |
| 1631 |
|
| 1632 |
#define DURATION_MAX_READ_SIZE 250000 |
| 1633 |
|
| 1634 |
/* only usable for MPEG-PS streams */
|
| 1635 |
static void av_estimate_timings_from_pts(AVFormatContext *ic) |
| 1636 |
{
|
| 1637 |
AVPacket pkt1, *pkt = &pkt1; |
| 1638 |
AVStream *st; |
| 1639 |
int read_size, i, ret;
|
| 1640 |
int64_t end_time; |
| 1641 |
int64_t filesize, offset, duration; |
| 1642 |
|
| 1643 |
/* free previous packet */
|
| 1644 |
if (ic->cur_st && ic->cur_st->parser)
|
| 1645 |
av_free_packet(&ic->cur_pkt); |
| 1646 |
ic->cur_st = NULL;
|
| 1647 |
|
| 1648 |
/* flush packet queue */
|
| 1649 |
flush_packet_queue(ic); |
| 1650 |
|
| 1651 |
for(i=0;i<ic->nb_streams;i++) { |
| 1652 |
st = ic->streams[i]; |
| 1653 |
if (st->parser) {
|
| 1654 |
av_parser_close(st->parser); |
| 1655 |
st->parser= NULL;
|
| 1656 |
} |
| 1657 |
} |
| 1658 |
|
| 1659 |
/* we read the first packets to get the first PTS (not fully
|
| 1660 |
accurate, but it is enough now) */
|
| 1661 |
url_fseek(&ic->pb, 0, SEEK_SET);
|
| 1662 |
read_size = 0;
|
| 1663 |
for(;;) {
|
| 1664 |
if (read_size >= DURATION_MAX_READ_SIZE)
|
| 1665 |
break;
|
| 1666 |
/* if all info is available, we can stop */
|
| 1667 |
for(i = 0;i < ic->nb_streams; i++) { |
| 1668 |
st = ic->streams[i]; |
| 1669 |
if (st->start_time == AV_NOPTS_VALUE)
|
| 1670 |
break;
|
| 1671 |
} |
| 1672 |
if (i == ic->nb_streams)
|
| 1673 |
break;
|
| 1674 |
|
| 1675 |
ret = av_read_packet(ic, pkt); |
| 1676 |
if (ret != 0) |
| 1677 |
break;
|
| 1678 |
read_size += pkt->size; |
| 1679 |
st = ic->streams[pkt->stream_index]; |
| 1680 |
if (pkt->pts != AV_NOPTS_VALUE) {
|
| 1681 |
if (st->start_time == AV_NOPTS_VALUE)
|
| 1682 |
st->start_time = pkt->pts; |
| 1683 |
} |
| 1684 |
av_free_packet(pkt); |
| 1685 |
} |
| 1686 |
|
| 1687 |
/* estimate the end time (duration) */
|
| 1688 |
/* XXX: may need to support wrapping */
|
| 1689 |
filesize = ic->file_size; |
| 1690 |
offset = filesize - DURATION_MAX_READ_SIZE; |
| 1691 |
if (offset < 0) |
| 1692 |
offset = 0;
|
| 1693 |
|
| 1694 |
url_fseek(&ic->pb, offset, SEEK_SET); |
| 1695 |
read_size = 0;
|
| 1696 |
for(;;) {
|
| 1697 |
if (read_size >= DURATION_MAX_READ_SIZE)
|
| 1698 |
break;
|
| 1699 |
/* if all info is available, we can stop */
|
| 1700 |
for(i = 0;i < ic->nb_streams; i++) { |
| 1701 |
st = ic->streams[i]; |
| 1702 |
if (st->duration == AV_NOPTS_VALUE)
|
| 1703 |
break;
|
| 1704 |
} |
| 1705 |
if (i == ic->nb_streams)
|
| 1706 |
break;
|
| 1707 |
|
| 1708 |
ret = av_read_packet(ic, pkt); |
| 1709 |
if (ret != 0) |
| 1710 |
break;
|
| 1711 |
read_size += pkt->size; |
| 1712 |
st = ic->streams[pkt->stream_index]; |
| 1713 |
if (pkt->pts != AV_NOPTS_VALUE) {
|
| 1714 |
end_time = pkt->pts; |
| 1715 |
duration = end_time - st->start_time; |
| 1716 |
if (duration > 0) { |
| 1717 |
if (st->duration == AV_NOPTS_VALUE ||
|
| 1718 |
st->duration < duration) |
| 1719 |
st->duration = duration; |
| 1720 |
} |
| 1721 |
} |
| 1722 |
av_free_packet(pkt); |
| 1723 |
} |
| 1724 |
|
| 1725 |
fill_all_stream_timings(ic); |
| 1726 |
|
| 1727 |
url_fseek(&ic->pb, 0, SEEK_SET);
|
| 1728 |
} |
| 1729 |
|
| 1730 |
static void av_estimate_timings(AVFormatContext *ic) |
| 1731 |
{
|
| 1732 |
int64_t file_size; |
| 1733 |
|
| 1734 |
/* get the file size, if possible */
|
| 1735 |
if (ic->iformat->flags & AVFMT_NOFILE) {
|
| 1736 |
file_size = 0;
|
| 1737 |
} else {
|
| 1738 |
file_size = url_fsize(&ic->pb); |
| 1739 |
if (file_size < 0) |
| 1740 |
file_size = 0;
|
| 1741 |
} |
| 1742 |
ic->file_size = file_size; |
| 1743 |
|
| 1744 |
if ((ic->iformat == &mpegps_demux || ic->iformat == &mpegts_demux) && file_size && !ic->pb.is_streamed) {
|
| 1745 |
/* get accurate estimate from the PTSes */
|
| 1746 |
av_estimate_timings_from_pts(ic); |
| 1747 |
} else if (av_has_timings(ic)) { |
| 1748 |
/* at least one components has timings - we use them for all
|
| 1749 |
the components */
|
| 1750 |
fill_all_stream_timings(ic); |
| 1751 |
} else {
|
| 1752 |
/* less precise: use bit rate info */
|
| 1753 |
av_estimate_timings_from_bit_rate(ic); |
| 1754 |
} |
| 1755 |
av_update_stream_timings(ic); |
| 1756 |
|
| 1757 |
#if 0
|
| 1758 |
{
|
| 1759 |
int i;
|
| 1760 |
AVStream *st;
|
| 1761 |
for(i = 0;i < ic->nb_streams; i++) {
|
| 1762 |
st = ic->streams[i];
|
| 1763 |
printf("%d: start_time: %0.3f duration: %0.3f\n",
|
| 1764 |
i, (double)st->start_time / AV_TIME_BASE,
|
| 1765 |
(double)st->duration / AV_TIME_BASE);
|
| 1766 |
}
|
| 1767 |
printf("stream: start_time: %0.3f duration: %0.3f bitrate=%d kb/s\n",
|
| 1768 |
(double)ic->start_time / AV_TIME_BASE,
|
| 1769 |
(double)ic->duration / AV_TIME_BASE,
|
| 1770 |
ic->bit_rate / 1000);
|
| 1771 |
}
|
| 1772 |
#endif
|
| 1773 |
} |
| 1774 |
|
| 1775 |
static int has_codec_parameters(AVCodecContext *enc) |
| 1776 |
{
|
| 1777 |
int val;
|
| 1778 |
switch(enc->codec_type) {
|
| 1779 |
case CODEC_TYPE_AUDIO:
|
| 1780 |
val = enc->sample_rate; |
| 1781 |
break;
|
| 1782 |
case CODEC_TYPE_VIDEO:
|
| 1783 |
val = enc->width && enc->pix_fmt != PIX_FMT_NONE; |
| 1784 |
break;
|
| 1785 |
default:
|
| 1786 |
val = 1;
|
| 1787 |
break;
|
| 1788 |
} |
| 1789 |
return (val != 0); |
| 1790 |
} |
| 1791 |
|
| 1792 |
static int try_decode_frame(AVStream *st, const uint8_t *data, int size) |
| 1793 |
{
|
| 1794 |
int16_t *samples; |
| 1795 |
AVCodec *codec; |
| 1796 |
int got_picture, ret=0; |
| 1797 |
AVFrame picture; |
| 1798 |
|
| 1799 |
if(!st->codec->codec){
|
| 1800 |
codec = avcodec_find_decoder(st->codec->codec_id); |
| 1801 |
if (!codec)
|
| 1802 |
return -1; |
| 1803 |
ret = avcodec_open(st->codec, codec); |
| 1804 |
if (ret < 0) |
| 1805 |
return ret;
|
| 1806 |
} |
| 1807 |
|
| 1808 |
if(!has_codec_parameters(st->codec)){
|
| 1809 |
switch(st->codec->codec_type) {
|
| 1810 |
case CODEC_TYPE_VIDEO:
|
| 1811 |
ret = avcodec_decode_video(st->codec, &picture, |
| 1812 |
&got_picture, (uint8_t *)data, size); |
| 1813 |
break;
|
| 1814 |
case CODEC_TYPE_AUDIO:
|
| 1815 |
samples = av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE); |
| 1816 |
if (!samples)
|
| 1817 |
goto fail;
|
| 1818 |
ret = avcodec_decode_audio(st->codec, samples, |
| 1819 |
&got_picture, (uint8_t *)data, size); |
| 1820 |
av_free(samples); |
| 1821 |
break;
|
| 1822 |
default:
|
| 1823 |
break;
|
| 1824 |
} |
| 1825 |
} |
| 1826 |
fail:
|
| 1827 |
return ret;
|
| 1828 |
} |
| 1829 |
|
| 1830 |
/* absolute maximum size we read until we abort */
|
| 1831 |
#define MAX_READ_SIZE 5000000 |
| 1832 |
|
| 1833 |
/* maximum duration until we stop analysing the stream */
|
| 1834 |
#define MAX_STREAM_DURATION ((int)(AV_TIME_BASE * 2.0)) |
| 1835 |
|
| 1836 |
/**
|
| 1837 |
* Read the beginning of a media file to get stream information. This
|
| 1838 |
* is useful for file formats with no headers such as MPEG. This
|
| 1839 |
* function also compute the real frame rate in case of mpeg2 repeat
|
| 1840 |
* frame mode.
|
| 1841 |
*
|
| 1842 |
* @param ic media file handle
|
| 1843 |
* @return >=0 if OK. AVERROR_xxx if error.
|
| 1844 |
* @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
|
| 1845 |
*/
|
| 1846 |
int av_find_stream_info(AVFormatContext *ic)
|
| 1847 |
{
|
| 1848 |
int i, count, ret, read_size;
|
| 1849 |
AVStream *st; |
| 1850 |
AVPacket pkt1, *pkt; |
| 1851 |
AVPacketList *pktl=NULL, **ppktl;
|
| 1852 |
int64_t last_dts[MAX_STREAMS]; |
| 1853 |
int64_t duration_sum[MAX_STREAMS]; |
| 1854 |
int duration_count[MAX_STREAMS]={0}; |
| 1855 |
|
| 1856 |
for(i=0;i<ic->nb_streams;i++) { |
| 1857 |
st = ic->streams[i]; |
| 1858 |
if(st->codec->codec_type == CODEC_TYPE_VIDEO){
|
| 1859 |
/* if(!st->time_base.num)
|
| 1860 |
st->time_base= */
|
| 1861 |
if(!st->codec->time_base.num)
|
| 1862 |
st->codec->time_base= st->time_base; |
| 1863 |
} |
| 1864 |
//only for the split stuff
|
| 1865 |
if (!st->parser) {
|
| 1866 |
st->parser = av_parser_init(st->codec->codec_id); |
| 1867 |
if(st->need_parsing == 2 && st->parser){ |
| 1868 |
st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES; |
| 1869 |
} |
| 1870 |
} |
| 1871 |
} |
| 1872 |
|
| 1873 |
for(i=0;i<MAX_STREAMS;i++){ |
| 1874 |
last_dts[i]= AV_NOPTS_VALUE; |
| 1875 |
duration_sum[i]= INT64_MAX; |
| 1876 |
} |
| 1877 |
|
| 1878 |
count = 0;
|
| 1879 |
read_size = 0;
|
| 1880 |
ppktl = &ic->packet_buffer; |
| 1881 |
for(;;) {
|
| 1882 |
/* check if one codec still needs to be handled */
|
| 1883 |
for(i=0;i<ic->nb_streams;i++) { |
| 1884 |
st = ic->streams[i]; |
| 1885 |
if (!has_codec_parameters(st->codec))
|
| 1886 |
break;
|
| 1887 |
/* variable fps and no guess at the real fps */
|
| 1888 |
if( st->codec->time_base.den >= 1000LL*st->codec->time_base.num |
| 1889 |
&& duration_count[i]<20 && st->codec->codec_type == CODEC_TYPE_VIDEO)
|
| 1890 |
break;
|
| 1891 |
if(st->parser && st->parser->parser->split && !st->codec->extradata)
|
| 1892 |
break;
|
| 1893 |
} |
| 1894 |
if (i == ic->nb_streams) {
|
| 1895 |
/* NOTE: if the format has no header, then we need to read
|
| 1896 |
some packets to get most of the streams, so we cannot
|
| 1897 |
stop here */
|
| 1898 |
if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
|
| 1899 |
/* if we found the info for all the codecs, we can stop */
|
| 1900 |
ret = count; |
| 1901 |
break;
|
| 1902 |
} |
| 1903 |
} else {
|
| 1904 |
/* we did not get all the codec info, but we read too much data */
|
| 1905 |
if (read_size >= MAX_READ_SIZE) {
|
| 1906 |
ret = count; |
| 1907 |
break;
|
| 1908 |
} |
| 1909 |
} |
| 1910 |
|
| 1911 |
/* NOTE: a new stream can be added there if no header in file
|
| 1912 |
(AVFMTCTX_NOHEADER) */
|
| 1913 |
ret = av_read_frame_internal(ic, &pkt1); |
| 1914 |
if (ret < 0) { |
| 1915 |
/* EOF or error */
|
| 1916 |
ret = -1; /* we could not have all the codec parameters before EOF */ |
| 1917 |
for(i=0;i<ic->nb_streams;i++) { |
| 1918 |
st = ic->streams[i]; |
| 1919 |
if (!has_codec_parameters(st->codec))
|
| 1920 |
break;
|
| 1921 |
} |
| 1922 |
if (i == ic->nb_streams)
|
| 1923 |
ret = 0;
|
| 1924 |
break;
|
| 1925 |
} |
| 1926 |
|
| 1927 |
pktl = av_mallocz(sizeof(AVPacketList));
|
| 1928 |
if (!pktl) {
|
| 1929 |
ret = AVERROR_NOMEM; |
| 1930 |
break;
|
| 1931 |
} |
| 1932 |
|
| 1933 |
/* add the packet in the buffered packet list */
|
| 1934 |
*ppktl = pktl; |
| 1935 |
ppktl = &pktl->next; |
| 1936 |
|
| 1937 |
pkt = &pktl->pkt; |
| 1938 |
*pkt = pkt1; |
| 1939 |
|
| 1940 |
/* duplicate the packet */
|
| 1941 |
if (av_dup_packet(pkt) < 0) { |
| 1942 |
ret = AVERROR_NOMEM; |
| 1943 |
break;
|
| 1944 |
} |
| 1945 |
|
| 1946 |
read_size += pkt->size; |
| 1947 |
|
| 1948 |
st = ic->streams[pkt->stream_index]; |
| 1949 |
st->codec_info_duration += pkt->duration; |
| 1950 |
if (pkt->duration != 0) |
| 1951 |
st->codec_info_nb_frames++; |
| 1952 |
|
| 1953 |
{
|
| 1954 |
int index= pkt->stream_index;
|
| 1955 |
int64_t last= last_dts[index]; |
| 1956 |
int64_t duration= pkt->dts - last; |
| 1957 |
|
| 1958 |
if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && duration>0){ |
| 1959 |
if(duration*duration_count[index]*10/9 < duration_sum[index]){ |
| 1960 |
duration_sum[index]= duration; |
| 1961 |
duration_count[index]=1;
|
| 1962 |
}else{
|
| 1963 |
int factor= av_rescale(duration, duration_count[index], duration_sum[index]);
|
| 1964 |
duration_sum[index] += duration; |
| 1965 |
duration_count[index]+= factor; |
| 1966 |
} |
| 1967 |
if(st->codec_info_nb_frames == 0 && 0) |
| 1968 |
st->codec_info_duration += duration; |
| 1969 |
} |
| 1970 |
last_dts[pkt->stream_index]= pkt->dts; |
| 1971 |
} |
| 1972 |
if(st->parser && st->parser->parser->split && !st->codec->extradata){
|
| 1973 |
int i= st->parser->parser->split(st->codec, pkt->data, pkt->size);
|
| 1974 |
if(i){
|
| 1975 |
st->codec->extradata_size= i; |
| 1976 |
st->codec->extradata= av_malloc(st->codec->extradata_size); |
| 1977 |
memcpy(st->codec->extradata, pkt->data, st->codec->extradata_size); |
| 1978 |
} |
| 1979 |
} |
| 1980 |
|
| 1981 |
/* if still no information, we try to open the codec and to
|
| 1982 |
decompress the frame. We try to avoid that in most cases as
|
| 1983 |
it takes longer and uses more memory. For MPEG4, we need to
|
| 1984 |
decompress for Quicktime. */
|
| 1985 |
if (!has_codec_parameters(st->codec) /*&& |
| 1986 |
(st->codec->codec_id == CODEC_ID_FLV1 ||
|
| 1987 |
st->codec->codec_id == CODEC_ID_H264 ||
|
| 1988 |
st->codec->codec_id == CODEC_ID_H263 ||
|
| 1989 |
st->codec->codec_id == CODEC_ID_H261 ||
|
| 1990 |
st->codec->codec_id == CODEC_ID_VORBIS ||
|
| 1991 |
st->codec->codec_id == CODEC_ID_MJPEG ||
|
| 1992 |
st->codec->codec_id == CODEC_ID_PNG ||
|
| 1993 |
st->codec->codec_id == CODEC_ID_PAM ||
|
| 1994 |
st->codec->codec_id == CODEC_ID_PGM ||
|
| 1995 |
st->codec->codec_id == CODEC_ID_PGMYUV ||
|
| 1996 |
st->codec->codec_id == CODEC_ID_PBM ||
|
| 1997 |
st->codec->codec_id == CODEC_ID_PPM ||
|
| 1998 |
st->codec->codec_id == CODEC_ID_SHORTEN ||
|
| 1999 |
(st->codec->codec_id == CODEC_ID_MPEG4 && !st->need_parsing))*/)
|
| 2000 |
try_decode_frame(st, pkt->data, pkt->size); |
| 2001 |
|
| 2002 |
if (av_rescale_q(st->codec_info_duration, st->time_base, AV_TIME_BASE_Q) >= MAX_STREAM_DURATION) {
|
| 2003 |
break;
|
| 2004 |
} |
| 2005 |
count++; |
| 2006 |
} |
| 2007 |
|
| 2008 |
// close codecs which where opened in try_decode_frame()
|
| 2009 |
for(i=0;i<ic->nb_streams;i++) { |
| 2010 |
st = ic->streams[i]; |
| 2011 |
if(st->codec->codec)
|
| 2012 |
avcodec_close(st->codec); |
| 2013 |
} |
| 2014 |
for(i=0;i<ic->nb_streams;i++) { |
| 2015 |
st = ic->streams[i]; |
| 2016 |
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
| 2017 |
if(st->codec->codec_id == CODEC_ID_RAWVIDEO && !st->codec->codec_tag && !st->codec->bits_per_sample)
|
| 2018 |
st->codec->codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt); |
| 2019 |
|
| 2020 |
if(duration_count[i] && st->codec->time_base.num*1000LL <= st->codec->time_base.den && |
| 2021 |
st->time_base.num*duration_sum[i]/duration_count[i]*1000LL > st->time_base.den){
|
| 2022 |
AVRational fps1; |
| 2023 |
int64_t num, den; |
| 2024 |
|
| 2025 |
num= st->time_base.den*duration_count[i]; |
| 2026 |
den= st->time_base.num*duration_sum[i]; |
| 2027 |
|
| 2028 |
av_reduce(&fps1.num, &fps1.den, num*1001, den*1000, FFMAX(st->time_base.den, st->time_base.num)/4); |
| 2029 |
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, den, FFMAX(st->time_base.den, st->time_base.num)/4);
|
| 2030 |
if(fps1.num < st->r_frame_rate.num && fps1.den == 1 && (fps1.num==24 || fps1.num==30)){ //FIXME better decission |
| 2031 |
st->r_frame_rate.num= fps1.num*1000;
|
| 2032 |
st->r_frame_rate.den= fps1.den*1001;
|
| 2033 |
} |
| 2034 |
} |
| 2035 |
|
| 2036 |
/* set real frame rate info */
|
| 2037 |
/* compute the real frame rate for telecine */
|
| 2038 |
if ((st->codec->codec_id == CODEC_ID_MPEG1VIDEO ||
|
| 2039 |
st->codec->codec_id == CODEC_ID_MPEG2VIDEO) && |
| 2040 |
st->codec->sub_id == 2) {
|
| 2041 |
if (st->codec_info_nb_frames >= 20) { |
| 2042 |
float coded_frame_rate, est_frame_rate;
|
| 2043 |
est_frame_rate = ((double)st->codec_info_nb_frames * AV_TIME_BASE) /
|
| 2044 |
(double)st->codec_info_duration ;
|
| 2045 |
coded_frame_rate = 1.0/av_q2d(st->codec->time_base); |
| 2046 |
#if 0
|
| 2047 |
printf("telecine: coded_frame_rate=%0.3f est_frame_rate=%0.3f\n",
|
| 2048 |
coded_frame_rate, est_frame_rate);
|
| 2049 |
#endif
|
| 2050 |
/* if we detect that it could be a telecine, we
|
| 2051 |
signal it. It would be better to do it at a
|
| 2052 |
higher level as it can change in a film */
|
| 2053 |
if (coded_frame_rate >= 24.97 && |
| 2054 |
(est_frame_rate >= 23.5 && est_frame_rate < 24.5)) { |
| 2055 |
st->r_frame_rate = (AVRational){24000, 1001};
|
| 2056 |
} |
| 2057 |
} |
| 2058 |
} |
| 2059 |
/* if no real frame rate, use the codec one */
|
| 2060 |
if (!st->r_frame_rate.num){
|
| 2061 |
st->r_frame_rate.num = st->codec->time_base.den; |
| 2062 |
st->r_frame_rate.den = st->codec->time_base.num; |
| 2063 |
} |
| 2064 |
} |
| 2065 |
} |
| 2066 |
|
| 2067 |
av_estimate_timings(ic); |
| 2068 |
#if 0
|
| 2069 |
/* correct DTS for b frame streams with no timestamps */
|
| 2070 |
for(i=0;i<ic->nb_streams;i++) {
|
| 2071 |
st = ic->streams[i];
|
| 2072 |
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
| 2073 |
if(b-frames){
|
| 2074 |
ppktl = &ic->packet_buffer;
|
| 2075 |
while(ppkt1){
|
| 2076 |
if(ppkt1->stream_index != i)
|
| 2077 |
continue;
|
| 2078 |
if(ppkt1->pkt->dts < 0)
|
| 2079 |
break;
|
| 2080 |
if(ppkt1->pkt->pts != AV_NOPTS_VALUE)
|
| 2081 |
break;
|
| 2082 |
ppkt1->pkt->dts -= delta;
|
| 2083 |
ppkt1= ppkt1->next;
|
| 2084 |
}
|
| 2085 |
if(ppkt1)
|
| 2086 |
continue;
|
| 2087 |
st->cur_dts -= delta;
|
| 2088 |
}
|
| 2089 |
}
|
| 2090 |
}
|
| 2091 |
#endif
|
| 2092 |
return ret;
|
| 2093 |
} |
| 2094 |
|
| 2095 |
/*******************************************************/
|
| 2096 |
|
| 2097 |
/**
|
| 2098 |
* start playing a network based stream (e.g. RTSP stream) at the
|
| 2099 |
* current position
|
| 2100 |
*/
|
| 2101 |
int av_read_play(AVFormatContext *s)
|
| 2102 |
{
|
| 2103 |
if (!s->iformat->read_play)
|
| 2104 |
return AVERROR_NOTSUPP;
|
| 2105 |
return s->iformat->read_play(s);
|
| 2106 |
} |
| 2107 |
|
| 2108 |
/**
|
| 2109 |
* Pause a network based stream (e.g. RTSP stream).
|
| 2110 |
*
|
| 2111 |
* Use av_read_play() to resume it.
|
| 2112 |
*/
|
| 2113 |
int av_read_pause(AVFormatContext *s)
|
| 2114 |
{
|
| 2115 |
if (!s->iformat->read_pause)
|
| 2116 |
return AVERROR_NOTSUPP;
|
| 2117 |
return s->iformat->read_pause(s);
|
| 2118 |
} |
| 2119 |
|
| 2120 |
/**
|
| 2121 |
* Close a media file (but not its codecs).
|
| 2122 |
*
|
| 2123 |
* @param s media file handle
|
| 2124 |
*/
|
| 2125 |
void av_close_input_file(AVFormatContext *s)
|
| 2126 |
{
|
| 2127 |
int i, must_open_file;
|
| 2128 |
AVStream *st; |
| 2129 |
|
| 2130 |
/* free previous packet */
|
| 2131 |
if (s->cur_st && s->cur_st->parser)
|
| 2132 |
av_free_packet(&s->cur_pkt); |
| 2133 |
|
| 2134 |
if (s->iformat->read_close)
|
| 2135 |
s->iformat->read_close(s); |
| 2136 |
for(i=0;i<s->nb_streams;i++) { |
| 2137 |
/* free all data in a stream component */
|
| 2138 |
st = s->streams[i]; |
| 2139 |
if (st->parser) {
|
| 2140 |
av_parser_close(st->parser); |
| 2141 |
} |
| 2142 |
av_free(st->index_entries); |
| 2143 |
av_free(st->codec); |
| 2144 |
av_free(st); |
| 2145 |
} |
| 2146 |
flush_packet_queue(s); |
| 2147 |
must_open_file = 1;
|
| 2148 |
if (s->iformat->flags & AVFMT_NOFILE) {
|
| 2149 |
must_open_file = 0;
|
| 2150 |
} |
| 2151 |
if (must_open_file) {
|
| 2152 |
url_fclose(&s->pb); |
| 2153 |
} |
| 2154 |
av_freep(&s->priv_data); |
| 2155 |
av_free(s); |
| 2156 |
} |
| 2157 |
|
| 2158 |
/**
|
| 2159 |
* Add a new stream to a media file.
|
| 2160 |
*
|
| 2161 |
* Can only be called in the read_header() function. If the flag
|
| 2162 |
* AVFMTCTX_NOHEADER is in the format context, then new streams
|
| 2163 |
* can be added in read_packet too.
|
| 2164 |
*
|
| 2165 |
* @param s media file handle
|
| 2166 |
* @param id file format dependent stream id
|
| 2167 |
*/
|
| 2168 |
AVStream *av_new_stream(AVFormatContext *s, int id)
|
| 2169 |
{
|
| 2170 |
AVStream *st; |
| 2171 |
|
| 2172 |
if (s->nb_streams >= MAX_STREAMS)
|
| 2173 |
return NULL; |
| 2174 |
|
| 2175 |
st = av_mallocz(sizeof(AVStream));
|
| 2176 |
if (!st)
|
| 2177 |
return NULL; |
| 2178 |
|
| 2179 |
st->codec= avcodec_alloc_context(); |
| 2180 |
if (s->iformat) {
|
| 2181 |
/* no default bitrate if decoding */
|
| 2182 |
st->codec->bit_rate = 0;
|
| 2183 |
} |
| 2184 |
st->index = s->nb_streams; |
| 2185 |
st->id = id; |
| 2186 |
st->start_time = AV_NOPTS_VALUE; |
| 2187 |
st->duration = AV_NOPTS_VALUE; |
| 2188 |
st->cur_dts = AV_NOPTS_VALUE; |
| 2189 |
|
| 2190 |
/* default pts settings is MPEG like */
|
| 2191 |
av_set_pts_info(st, 33, 1, 90000); |
| 2192 |
st->last_IP_pts = AV_NOPTS_VALUE; |
| 2193 |
|
| 2194 |
s->streams[s->nb_streams++] = st; |
| 2195 |
return st;
|
| 2196 |
} |
| 2197 |
|
| 2198 |
/************************************************************/
|
| 2199 |
/* output media file */
|
| 2200 |
|
| 2201 |
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap)
|
| 2202 |
{
|
| 2203 |
int ret;
|
| 2204 |
|
| 2205 |
if (s->oformat->priv_data_size > 0) { |
| 2206 |
s->priv_data = av_mallocz(s->oformat->priv_data_size); |
| 2207 |
if (!s->priv_data)
|
| 2208 |
return AVERROR_NOMEM;
|
| 2209 |
} else
|
| 2210 |
s->priv_data = NULL;
|
| 2211 |
|
| 2212 |
if (s->oformat->set_parameters) {
|
| 2213 |
ret = s->oformat->set_parameters(s, ap); |
| 2214 |
if (ret < 0) |
| 2215 |
return ret;
|
| 2216 |
} |
| 2217 |
return 0; |
| 2218 |
} |
| 2219 |
|
| 2220 |
/**
|
| 2221 |
* allocate the stream private data and write the stream header to an
|
| 2222 |
* output media file
|
| 2223 |
*
|
| 2224 |
* @param s media file handle
|
| 2225 |
* @return 0 if OK. AVERROR_xxx if error.
|
| 2226 |
*/
|
| 2227 |
int av_write_header(AVFormatContext *s)
|
| 2228 |
{
|
| 2229 |
int ret, i;
|
| 2230 |
AVStream *st; |
| 2231 |
|
| 2232 |
// some sanity checks
|
| 2233 |
for(i=0;i<s->nb_streams;i++) { |
| 2234 |
st = s->streams[i]; |
| 2235 |
|
| 2236 |
switch (st->codec->codec_type) {
|
| 2237 |
case CODEC_TYPE_AUDIO:
|
| 2238 |
if(st->codec->sample_rate<=0){ |
| 2239 |
av_log(s, AV_LOG_ERROR, "sample rate not set\n");
|
| 2240 |
return -1; |
| 2241 |
} |
| 2242 |
break;
|
| 2243 |
case CODEC_TYPE_VIDEO:
|
| 2244 |
if(st->codec->time_base.num<=0 || st->codec->time_base.den<=0){ //FIXME audio too? |
| 2245 |
av_log(s, AV_LOG_ERROR, "time base not set\n");
|
| 2246 |
return -1; |
| 2247 |
} |
| 2248 |
if(st->codec->width<=0 || st->codec->height<=0){ |
| 2249 |
av_log(s, AV_LOG_ERROR, "dimensions not set\n");
|
| 2250 |
return -1; |
| 2251 |
} |
| 2252 |
break;
|
| 2253 |
} |
| 2254 |
} |
| 2255 |
|
| 2256 |
if(s->oformat->write_header){
|
| 2257 |
ret = s->oformat->write_header(s); |
| 2258 |
if (ret < 0) |
| 2259 |
return ret;
|
| 2260 |
} |
| 2261 |
|
| 2262 |
/* init PTS generation */
|
| 2263 |
for(i=0;i<s->nb_streams;i++) { |
| 2264 |
int64_t den = AV_NOPTS_VALUE; |
| 2265 |
st = s->streams[i]; |
| 2266 |
|
| 2267 |
switch (st->codec->codec_type) {
|
| 2268 |
case CODEC_TYPE_AUDIO:
|
| 2269 |
den = (int64_t)st->time_base.num * st->codec->sample_rate; |
| 2270 |
break;
|
| 2271 |
case CODEC_TYPE_VIDEO:
|
| 2272 |
den = (int64_t)st->time_base.num * st->codec->time_base.den; |
| 2273 |
break;
|
| 2274 |
default:
|
| 2275 |
break;
|
| 2276 |
} |
| 2277 |
if (den != AV_NOPTS_VALUE) {
|
| 2278 |
if (den <= 0) |
| 2279 |
return AVERROR_INVALIDDATA;
|
| 2280 |
av_frac_init(&st->pts, 0, 0, den); |
| 2281 |
} |
| 2282 |
} |
| 2283 |
return 0; |
| 2284 |
} |
| 2285 |
|
| 2286 |
//FIXME merge with compute_pkt_fields
|
| 2287 |
static int compute_pkt_fields2(AVStream *st, AVPacket *pkt){ |
| 2288 |
int b_frames = FFMAX(st->codec->has_b_frames, st->codec->max_b_frames);
|
| 2289 |
int num, den, frame_size;
|
| 2290 |
|
| 2291 |
// av_log(NULL, AV_LOG_DEBUG, "av_write_frame: pts:%lld dts:%lld cur_dts:%lld b:%d size:%d st:%d\n", pkt->pts, pkt->dts, st->cur_dts, b_frames, pkt->size, pkt->stream_index);
|
| 2292 |
|
| 2293 |
/* if(pkt->pts == AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE)
|
| 2294 |
return -1;*/
|
| 2295 |
|
| 2296 |
/* duration field */
|
| 2297 |
if (pkt->duration == 0) { |
| 2298 |
compute_frame_duration(&num, &den, st, NULL, pkt);
|
| 2299 |
if (den && num) {
|
| 2300 |
pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
|
| 2301 |
} |
| 2302 |
} |
| 2303 |
|
| 2304 |
//XXX/FIXME this is a temporary hack until all encoders output pts
|
| 2305 |
if((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !b_frames){ |
| 2306 |
pkt->dts= |
| 2307 |
// pkt->pts= st->cur_dts;
|
| 2308 |
pkt->pts= st->pts.val; |
| 2309 |
} |
| 2310 |
|
| 2311 |
//calculate dts from pts
|
| 2312 |
if(pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE){
|
| 2313 |
if(b_frames){
|
| 2314 |
if(st->last_IP_pts == AV_NOPTS_VALUE){
|
| 2315 |
st->last_IP_pts= -pkt->duration; |
| 2316 |
} |
| 2317 |
if(st->last_IP_pts < pkt->pts){
|
| 2318 |
pkt->dts= st->last_IP_pts; |
| 2319 |
st->last_IP_pts= pkt->pts; |
| 2320 |
}else
|
| 2321 |
pkt->dts= pkt->pts; |
| 2322 |
}else
|
| 2323 |
pkt->dts= pkt->pts; |
| 2324 |
} |
| 2325 |
|
| 2326 |
if(st->cur_dts && st->cur_dts != AV_NOPTS_VALUE && st->cur_dts >= pkt->dts){
|
| 2327 |
av_log(NULL, AV_LOG_ERROR, "error, non monotone timestamps %"PRId64" >= %"PRId64"\n", st->cur_dts, pkt->dts); |
| 2328 |
return -1; |
| 2329 |
} |
| 2330 |
if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts){
|
| 2331 |
av_log(NULL, AV_LOG_ERROR, "error, pts < dts\n"); |
| 2332 |
return -1; |
| 2333 |
} |
| 2334 |
|
| 2335 |
// av_log(NULL, AV_LOG_DEBUG, "av_write_frame: pts2:%lld dts2:%lld\n", pkt->pts, pkt->dts);
|
| 2336 |
st->cur_dts= pkt->dts; |
| 2337 |
st->pts.val= pkt->dts; |
| 2338 |
|
| 2339 |
/* update pts */
|
| 2340 |
switch (st->codec->codec_type) {
|
| 2341 |
case CODEC_TYPE_AUDIO:
|
| 2342 |
frame_size = get_audio_frame_size(st->codec, pkt->size); |
| 2343 |
|
| 2344 |
/* HACK/FIXME, we skip the initial 0-size packets as they are most likely equal to the encoder delay,
|
| 2345 |
but it would be better if we had the real timestamps from the encoder */
|
| 2346 |
if (frame_size >= 0 && (pkt->size || st->pts.num!=st->pts.den>>1 || st->pts.val)) { |
| 2347 |
av_frac_add(&st->pts, (int64_t)st->time_base.den * frame_size); |
| 2348 |
} |
| 2349 |
break;
|
| 2350 |
case CODEC_TYPE_VIDEO:
|
| 2351 |
av_frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num); |
| 2352 |
break;
|
| 2353 |
default:
|
| 2354 |
break;
|
| 2355 |
} |
| 2356 |
return 0; |
| 2357 |
} |
| 2358 |
|
| 2359 |
static void truncate_ts(AVStream *st, AVPacket *pkt){ |
| 2360 |
int64_t pts_mask = (2LL << (st->pts_wrap_bits-1)) - 1; |
| 2361 |
|
| 2362 |
// if(pkt->dts < 0)
|
| 2363 |
// pkt->dts= 0; //this happens for low_delay=0 and b frames, FIXME, needs further invstigation about what we should do here
|
| 2364 |
|
| 2365 |
pkt->pts &= pts_mask; |
| 2366 |
pkt->dts &= pts_mask; |
| 2367 |
} |
| 2368 |
|
| 2369 |
/**
|
| 2370 |
* Write a packet to an output media file.
|
| 2371 |
*
|
| 2372 |
* The packet shall contain one audio or video frame.
|
| 2373 |
*
|
| 2374 |
* @param s media file handle
|
| 2375 |
* @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
|
| 2376 |
* @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
|
| 2377 |
*/
|
| 2378 |
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
|
| 2379 |
{
|
| 2380 |
int ret;
|
| 2381 |
|
| 2382 |
ret=compute_pkt_fields2(s->streams[pkt->stream_index], pkt); |
| 2383 |
if(ret<0) |
| 2384 |
return ret;
|
| 2385 |
|
| 2386 |
truncate_ts(s->streams[pkt->stream_index], pkt); |
| 2387 |
|
| 2388 |
ret= s->oformat->write_packet(s, pkt); |
| 2389 |
if(!ret)
|
| 2390 |
ret= url_ferror(&s->pb); |
| 2391 |
return ret;
|
| 2392 |
} |
| 2393 |
|
| 2394 |
/**
|
| 2395 |
* interleave_packet implementation which will interleave per DTS.
|
| 2396 |
* packets with pkt->destruct == av_destruct_packet will be freed inside this function.
|
| 2397 |
* so they cannot be used after it, note calling av_free_packet() on them is still safe
|
| 2398 |
*/
|
| 2399 |
static int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush){ |
| 2400 |
AVPacketList *pktl, **next_point, *this_pktl; |
| 2401 |
int stream_count=0; |
| 2402 |
int streams[MAX_STREAMS];
|
| 2403 |
|
| 2404 |
if(pkt){
|
| 2405 |
AVStream *st= s->streams[ pkt->stream_index]; |
| 2406 |
|
| 2407 |
// assert(pkt->destruct != av_destruct_packet); //FIXME
|
| 2408 |
|
| 2409 |
this_pktl = av_mallocz(sizeof(AVPacketList));
|
| 2410 |
this_pktl->pkt= *pkt; |
| 2411 |
if(pkt->destruct == av_destruct_packet)
|
| 2412 |
pkt->destruct= NULL; // non shared -> must keep original from being freed |
| 2413 |
else
|
| 2414 |
av_dup_packet(&this_pktl->pkt); //shared -> must dup
|
| 2415 |
|
| 2416 |
next_point = &s->packet_buffer; |
| 2417 |
while(*next_point){
|
| 2418 |
AVStream *st2= s->streams[ (*next_point)->pkt.stream_index]; |
| 2419 |
int64_t left= st2->time_base.num * (int64_t)st ->time_base.den; |
| 2420 |
int64_t right= st ->time_base.num * (int64_t)st2->time_base.den; |
| 2421 |
if((*next_point)->pkt.dts * left > pkt->dts * right) //FIXME this can overflow |
| 2422 |
break;
|
| 2423 |
next_point= &(*next_point)->next; |
| 2424 |
} |
| 2425 |
this_pktl->next= *next_point; |
| 2426 |
*next_point= this_pktl; |
| 2427 |
} |
| 2428 |
|
| 2429 |
memset(streams, 0, sizeof(streams)); |
| 2430 |
pktl= s->packet_buffer; |
| 2431 |
while(pktl){
|
| 2432 |
//av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);
|
| 2433 |
if(streams[ pktl->pkt.stream_index ] == 0) |
| 2434 |
stream_count++; |
| 2435 |
streams[ pktl->pkt.stream_index ]++; |
| 2436 |
pktl= pktl->next; |
| 2437 |
} |
| 2438 |
|
| 2439 |
if(s->nb_streams == stream_count || (flush && stream_count)){
|
| 2440 |
pktl= s->packet_buffer; |
| 2441 |
*out= pktl->pkt; |
| 2442 |
|
| 2443 |
s->packet_buffer= pktl->next; |
| 2444 |
av_freep(&pktl); |
| 2445 |
return 1; |
| 2446 |
}else{
|
| 2447 |
av_init_packet(out); |
| 2448 |
return 0; |
| 2449 |
} |
| 2450 |
} |
| 2451 |
|
| 2452 |
/**
|
| 2453 |
* Interleaves a AVPacket correctly so it can be muxed.
|
| 2454 |
* @param out the interleaved packet will be output here
|
| 2455 |
* @param in the input packet
|
| 2456 |
* @param flush 1 if no further packets are available as input and all
|
| 2457 |
* remaining packets should be output
|
| 2458 |
* @return 1 if a packet was output, 0 if no packet could be output,
|
| 2459 |
* < 0 if an error occured
|
| 2460 |
*/
|
| 2461 |
static int av_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush){ |
| 2462 |
if(s->oformat->interleave_packet)
|
| 2463 |
return s->oformat->interleave_packet(s, out, in, flush);
|
| 2464 |
else
|
| 2465 |
return av_interleave_packet_per_dts(s, out, in, flush);
|
| 2466 |
} |
| 2467 |
|
| 2468 |
/**
|
| 2469 |
* Writes a packet to an output media file ensuring correct interleaving.
|
| 2470 |
*
|
| 2471 |
* The packet must contain one audio or video frame.
|
| 2472 |
* If the packets are already correctly interleaved the application should
|
| 2473 |
* call av_write_frame() instead as its slightly faster, its also important
|
| 2474 |
* to keep in mind that completly non interleaved input will need huge amounts
|
| 2475 |
* of memory to interleave with this, so its prefereable to interleave at the
|
| 2476 |
* demuxer level
|
| 2477 |
*
|
| 2478 |
* @param s media file handle
|
| 2479 |
* @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
|
| 2480 |
* @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
|
| 2481 |
*/
|
| 2482 |
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt){
|
| 2483 |
AVStream *st= s->streams[ pkt->stream_index]; |
| 2484 |
|
| 2485 |
//FIXME/XXX/HACK drop zero sized packets
|
| 2486 |
if(st->codec->codec_type == CODEC_TYPE_AUDIO && pkt->size==0) |
| 2487 |
return 0; |
| 2488 |
|
| 2489 |
//av_log(NULL, AV_LOG_DEBUG, "av_interleaved_write_frame %d %Ld %Ld\n", pkt->size, pkt->dts, pkt->pts);
|
| 2490 |
if(compute_pkt_fields2(st, pkt) < 0) |
| 2491 |
return -1; |
| 2492 |
|
| 2493 |
if(pkt->dts == AV_NOPTS_VALUE)
|
| 2494 |
return -1; |
| 2495 |
|
| 2496 |
for(;;){
|
| 2497 |
AVPacket opkt; |
| 2498 |
int ret= av_interleave_packet(s, &opkt, pkt, 0); |
| 2499 |
if(ret<=0) //FIXME cleanup needed for ret<0 ? |
| 2500 |
return ret;
|
| 2501 |
|
| 2502 |
truncate_ts(s->streams[opkt.stream_index], &opkt); |
| 2503 |
ret= s->oformat->write_packet(s, &opkt); |
| 2504 |
|
| 2505 |
av_free_packet(&opkt); |
| 2506 |
pkt= NULL;
|
| 2507 |
|
| 2508 |
if(ret<0) |
| 2509 |
return ret;
|
| 2510 |
if(url_ferror(&s->pb))
|
| 2511 |
return url_ferror(&s->pb);
|
| 2512 |
} |
| 2513 |
} |
| 2514 |
|
| 2515 |
/**
|
| 2516 |
* @brief Write the stream trailer to an output media file and
|
| 2517 |
* free the file private data.
|
| 2518 |
*
|
| 2519 |
* @param s media file handle
|
| 2520 |
* @return 0 if OK. AVERROR_xxx if error.
|
| 2521 |
*/
|
| 2522 |
int av_write_trailer(AVFormatContext *s)
|
| 2523 |
{
|
| 2524 |
int ret, i;
|
| 2525 |
|
| 2526 |
for(;;){
|
| 2527 |
AVPacket pkt; |
| 2528 |
ret= av_interleave_packet(s, &pkt, NULL, 1); |
| 2529 |
if(ret<0) //FIXME cleanup needed for ret<0 ? |
| 2530 |
goto fail;
|
| 2531 |
if(!ret)
|
| 2532 |
break;
|
| 2533 |
|
| 2534 |
truncate_ts(s->streams[pkt.stream_index], &pkt); |
| 2535 |
ret= s->oformat->write_packet(s, &pkt); |
| 2536 |
|
| 2537 |
av_free_packet(&pkt); |
| 2538 |
|
| 2539 |
if(ret<0) |
| 2540 |
goto fail;
|
| 2541 |
if(url_ferror(&s->pb))
|
| 2542 |
goto fail;
|
| 2543 |
} |
| 2544 |
|
| 2545 |
if(s->oformat->write_trailer)
|
| 2546 |
ret = s->oformat->write_trailer(s); |
| 2547 |
fail:
|
| 2548 |
if(ret == 0) |
| 2549 |
ret=url_ferror(&s->pb); |
| 2550 |
for(i=0;i<s->nb_streams;i++) |
| 2551 |
av_freep(&s->streams[i]->priv_data); |
| 2552 |
av_freep(&s->priv_data); |
| 2553 |
return ret;
|
| 2554 |
} |
| 2555 |
|
| 2556 |
/* "user interface" functions */
|
| 2557 |
|
| 2558 |
void dump_format(AVFormatContext *ic,
|
| 2559 |
int index,
|
| 2560 |
const char *url, |
| 2561 |
int is_output)
|
| 2562 |
{
|
| 2563 |
int i, flags;
|
| 2564 |
char buf[256]; |
| 2565 |
|
| 2566 |
av_log(NULL, AV_LOG_INFO, "%s #%d, %s, %s '%s':\n", |
| 2567 |
is_output ? "Output" : "Input", |
| 2568 |
index, |
| 2569 |
is_output ? ic->oformat->name : ic->iformat->name, |
| 2570 |
is_output ? "to" : "from", url); |
| 2571 |
if (!is_output) {
|
| 2572 |
av_log(NULL, AV_LOG_INFO, " Duration: "); |
| 2573 |
if (ic->duration != AV_NOPTS_VALUE) {
|
| 2574 |
int hours, mins, secs, us;
|
| 2575 |
secs = ic->duration / AV_TIME_BASE; |
| 2576 |
us = ic->duration % AV_TIME_BASE; |
| 2577 |
mins = secs / 60;
|
| 2578 |
secs %= 60;
|
| 2579 |
hours = mins / 60;
|
| 2580 |
mins %= 60;
|
| 2581 |
av_log(NULL, AV_LOG_INFO, "%02d:%02d:%02d.%01d", hours, mins, secs, |
| 2582 |
(10 * us) / AV_TIME_BASE);
|
| 2583 |
} else {
|
| 2584 |
av_log(NULL, AV_LOG_INFO, "N/A"); |
| 2585 |
} |
| 2586 |
if (ic->start_time != AV_NOPTS_VALUE) {
|
| 2587 |
int secs, us;
|
| 2588 |
av_log(NULL, AV_LOG_INFO, ", start: "); |
| 2589 |
secs = ic->start_time / AV_TIME_BASE; |
| 2590 |
us = ic->start_time % AV_TIME_BASE; |
| 2591 |
av_log(NULL, AV_LOG_INFO, "%d.%06d", |
| 2592 |
secs, (int)av_rescale(us, 1000000, AV_TIME_BASE)); |
| 2593 |
} |
| 2594 |
av_log(NULL, AV_LOG_INFO, ", bitrate: "); |
| 2595 |
if (ic->bit_rate) {
|
| 2596 |
av_log(NULL, AV_LOG_INFO,"%d kb/s", ic->bit_rate / 1000); |
| 2597 |
} else {
|
| 2598 |
av_log(NULL, AV_LOG_INFO, "N/A"); |
| 2599 |
} |
| 2600 |
av_log(NULL, AV_LOG_INFO, "\n"); |
| 2601 |
} |
| 2602 |
for(i=0;i<ic->nb_streams;i++) { |
| 2603 |
AVStream *st = ic->streams[i]; |
| 2604 |
int g= ff_gcd(st->time_base.num, st->time_base.den);
|
| 2605 |
avcodec_string(buf, sizeof(buf), st->codec, is_output);
|
| 2606 |
av_log(NULL, AV_LOG_INFO, " Stream #%d.%d", index, i); |
| 2607 |
/* the pid is an important information, so we display it */
|
| 2608 |
/* XXX: add a generic system */
|
| 2609 |
if (is_output)
|
| 2610 |
flags = ic->oformat->flags; |
| 2611 |
else
|
| 2612 |
flags = ic->iformat->flags; |
| 2613 |
if (flags & AVFMT_SHOW_IDS) {
|
| 2614 |
av_log(NULL, AV_LOG_INFO, "[0x%x]", st->id); |
| 2615 |
} |
| 2616 |
if (strlen(st->language) > 0) { |
| 2617 |
av_log(NULL, AV_LOG_INFO, "(%s)", st->language); |
| 2618 |
} |
| 2619 |
av_log(NULL, AV_LOG_DEBUG, ", %d/%d", st->time_base.num/g, st->time_base.den/g); |
| 2620 |
if(st->codec->codec_type == CODEC_TYPE_VIDEO){
|
| 2621 |
if(st->r_frame_rate.den && st->r_frame_rate.num)
|
| 2622 |
av_log(NULL, AV_LOG_INFO, ", %5.2f fps(r)", av_q2d(st->r_frame_rate)); |
| 2623 |
/* else if(st->time_base.den && st->time_base.num)
|
| 2624 |
av_log(NULL, AV_LOG_INFO, ", %5.2f fps(m)", 1/av_q2d(st->time_base));*/
|
| 2625 |
else
|
| 2626 |
av_log(NULL, AV_LOG_INFO, ", %5.2f fps(c)", 1/av_q2d(st->codec->time_base)); |
| 2627 |
} |
| 2628 |
av_log(NULL, AV_LOG_INFO, ": %s\n", buf); |
| 2629 |
} |
| 2630 |
} |
| 2631 |
|
| 2632 |
typedef struct { |
| 2633 |
const char *abv; |
| 2634 |
int width, height;
|
| 2635 |
int frame_rate, frame_rate_base;
|
| 2636 |
} AbvEntry; |
| 2637 |
|
| 2638 |
static AbvEntry frame_abvs[] = {
|
| 2639 |
{ "ntsc", 720, 480, 30000, 1001 },
|
| 2640 |
{ "pal", 720, 576, 25, 1 },
|
| 2641 |
{ "qntsc", 352, 240, 30000, 1001 }, /* VCD compliant ntsc */
|
| 2642 |
{ "qpal", 352, 288, 25, 1 }, /* VCD compliant pal */
|
| 2643 |
{ "sntsc", 640, 480, 30000, 1001 }, /* square pixel ntsc */
|
| 2644 |
{ "spal", 768, 576, 25, 1 }, /* square pixel pal */
|
| 2645 |
{ "film", 352, 240, 24, 1 },
|
| 2646 |
{ "ntsc-film", 352, 240, 24000, 1001 },
|
| 2647 |
{ "sqcif", 128, 96, 0, 0 },
|
| 2648 |
{ "qcif", 176, 144, 0, 0 },
|
| 2649 |
{ "cif", 352, 288, 0, 0 },
|
| 2650 |
{ "4cif", 704, 576, 0, 0 },
|
| 2651 |
}; |
| 2652 |
|
| 2653 |
/**
|
| 2654 |
* parses width and height out of string str.
|
| 2655 |
*/
|
| 2656 |
int parse_image_size(int *width_ptr, int *height_ptr, const char *str) |
| 2657 |
{
|
| 2658 |
int i;
|
| 2659 |
int n = sizeof(frame_abvs) / sizeof(AbvEntry); |
| 2660 |
const char *p; |
| 2661 |
int frame_width = 0, frame_height = 0; |
| 2662 |
|
| 2663 |
for(i=0;i<n;i++) { |
| 2664 |
if (!strcmp(frame_abvs[i].abv, str)) {
|
| 2665 |
frame_width = frame_abvs[i].width; |
| 2666 |
frame_height = frame_abvs[i].height; |
| 2667 |
break;
|
| 2668 |
} |
| 2669 |
} |
| 2670 |
if (i == n) {
|
| 2671 |
p = str; |
| 2672 |
frame_width = strtol(p, (char **)&p, 10); |
| 2673 |
if (*p)
|
| 2674 |
p++; |
| 2675 |
frame_height = strtol(p, (char **)&p, 10); |
| 2676 |
} |
| 2677 |
if (frame_width <= 0 || frame_height <= 0) |
| 2678 |
return -1; |
| 2679 |
*width_ptr = frame_width; |
| 2680 |
*height_ptr = frame_height; |
| 2681 |
return 0; |
| 2682 |
} |
| 2683 |
|
| 2684 |
/**
|
| 2685 |
* Converts frame rate from string to a fraction.
|
| 2686 |
*
|
| 2687 |
* First we try to get an exact integer or fractional frame rate.
|
| 2688 |
* If this fails we convert the frame rate to a double and return
|
| 2689 |
* an approximate fraction using the DEFAULT_FRAME_RATE_BASE.
|
| 2690 |
*/
|
| 2691 |
int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg) |
| 2692 |
{
|
| 2693 |
int i;
|
| 2694 |
char* cp;
|
| 2695 |
|
| 2696 |
/* First, we check our abbreviation table */
|
| 2697 |
for (i = 0; i < sizeof(frame_abvs)/sizeof(*frame_abvs); ++i) |
| 2698 |
if (!strcmp(frame_abvs[i].abv, arg)) {
|
| 2699 |
*frame_rate = frame_abvs[i].frame_rate; |
| 2700 |
*frame_rate_base = frame_abvs[i].frame_rate_base; |
| 2701 |
return 0; |
| 2702 |
} |
| 2703 |
|
| 2704 |
/* Then, we try to parse it as fraction */
|
| 2705 |
cp = strchr(arg, '/');
|
| 2706 |
if (!cp)
|
| 2707 |
cp = strchr(arg, ':');
|
| 2708 |
if (cp) {
|
| 2709 |
char* cpp;
|
| 2710 |
*frame_rate = strtol(arg, &cpp, 10);
|
| 2711 |
if (cpp != arg || cpp == cp)
|
| 2712 |
*frame_rate_base = strtol(cp+1, &cpp, 10); |
| 2713 |
else
|
| 2714 |
*frame_rate = 0;
|
| 2715 |
} |
| 2716 |
else {
|
| 2717 |
/* Finally we give up and parse it as double */
|
| 2718 |
*frame_rate_base = DEFAULT_FRAME_RATE_BASE; //FIXME use av_d2q()
|
| 2719 |
*frame_rate = (int)(strtod(arg, 0) * (*frame_rate_base) + 0.5); |
| 2720 |
} |
| 2721 |
if (!*frame_rate || !*frame_rate_base)
|
| 2722 |
return -1; |
| 2723 |
else
|
| 2724 |
return 0; |
| 2725 |
} |
| 2726 |
|
| 2727 |
/**
|
| 2728 |
* Converts date string to number of seconds since Jan 1st, 1970.
|
| 2729 |
*
|
| 2730 |
* @code
|
| 2731 |
* Syntax:
|
| 2732 |
* - If not a duration:
|
| 2733 |
* [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
|
| 2734 |
* Time is localtime unless Z is suffixed to the end. In this case GMT
|
| 2735 |
* Return the date in micro seconds since 1970
|
| 2736 |
*
|
| 2737 |
* - If a duration:
|
| 2738 |
* HH[:MM[:SS[.m...]]]
|
| 2739 |
* S+[.m...]
|
| 2740 |
* @endcode
|
| 2741 |
*/
|
| 2742 |
int64_t parse_date(const char *datestr, int duration) |
| 2743 |
{
|
| 2744 |
const char *p; |
| 2745 |
int64_t t; |
| 2746 |
struct tm dt;
|
| 2747 |
int i;
|
| 2748 |
static const char *date_fmt[] = { |
| 2749 |
"%Y-%m-%d",
|
| 2750 |
"%Y%m%d",
|
| 2751 |
}; |
| 2752 |
static const char *time_fmt[] = { |
| 2753 |
"%H:%M:%S",
|
| 2754 |
"%H%M%S",
|
| 2755 |
}; |
| 2756 |
const char *q; |
| 2757 |
int is_utc, len;
|
| 2758 |
char lastch;
|
| 2759 |
int negative = 0; |
| 2760 |
|
| 2761 |
#undef time
|
| 2762 |
time_t now = time(0);
|
| 2763 |
|
| 2764 |
len = strlen(datestr); |
| 2765 |
if (len > 0) |
| 2766 |
lastch = datestr[len - 1];
|
| 2767 |
else
|
| 2768 |
lastch = '\0';
|
| 2769 |
is_utc = (lastch == 'z' || lastch == 'Z'); |
| 2770 |
|
| 2771 |
memset(&dt, 0, sizeof(dt)); |
| 2772 |
|
| 2773 |
p = datestr; |
| 2774 |
q = NULL;
|
| 2775 |
if (!duration) {
|
| 2776 |
for (i = 0; i < sizeof(date_fmt) / sizeof(date_fmt[0]); i++) { |
| 2777 |
q = small_strptime(p, date_fmt[i], &dt); |
| 2778 |
if (q) {
|
| 2779 |
break;
|
| 2780 |
} |
| 2781 |
} |
| 2782 |
|
| 2783 |
if (!q) {
|
| 2784 |
if (is_utc) {
|
| 2785 |
dt = *gmtime(&now); |
| 2786 |
} else {
|
| 2787 |
dt = *localtime(&now); |
| 2788 |
} |
| 2789 |
dt.tm_hour = dt.tm_min = dt.tm_sec = 0;
|
| 2790 |
} else {
|
| 2791 |
p = q; |
| 2792 |
} |
| 2793 |
|
| 2794 |
if (*p == 'T' || *p == 't' || *p == ' ') |
| 2795 |
p++; |
| 2796 |
|
| 2797 |
for (i = 0; i < sizeof(time_fmt) / sizeof(time_fmt[0]); i++) { |
| 2798 |
q = small_strptime(p, time_fmt[i], &dt); |
| 2799 |
if (q) {
|
| 2800 |
break;
|
| 2801 |
} |
| 2802 |
} |
| 2803 |
} else {
|
| 2804 |
if (p[0] == '-') { |
| 2805 |
negative = 1;
|
| 2806 |
++p; |
| 2807 |
} |
| 2808 |
q = small_strptime(p, time_fmt[0], &dt);
|
| 2809 |
if (!q) {
|
| 2810 |
dt.tm_sec = strtol(p, (char **)&q, 10); |
| 2811 |
dt.tm_min = 0;
|
| 2812 |
dt.tm_hour = 0;
|
| 2813 |
} |
| 2814 |
} |
| 2815 |
|
| 2816 |
/* Now we have all the fields that we can get */
|
| 2817 |
if (!q) {
|
| 2818 |
if (duration)
|
| 2819 |
return 0; |
| 2820 |
else
|
| 2821 |
return now * int64_t_C(1000000); |
| 2822 |
} |
| 2823 |
|
| 2824 |
if (duration) {
|
| 2825 |
t = dt.tm_hour * 3600 + dt.tm_min * 60 + dt.tm_sec; |
| 2826 |
} else {
|
| 2827 |
dt.tm_isdst = -1; /* unknown */ |
| 2828 |
if (is_utc) {
|
| 2829 |
t = mktimegm(&dt); |
| 2830 |
} else {
|
| 2831 |
t = mktime(&dt); |
| 2832 |
} |
| 2833 |
} |
| 2834 |
|
| 2835 |
t *= 1000000;
|
| 2836 |
|
| 2837 |
if (*q == '.') { |
| 2838 |
int val, n;
|
| 2839 |
q++; |
| 2840 |
for (val = 0, n = 100000; n >= 1; n /= 10, q++) { |
| 2841 |
if (!isdigit(*q))
|
| 2842 |
break;
|
| 2843 |
val += n * (*q - '0');
|
| 2844 |
} |
| 2845 |
t += val; |
| 2846 |
} |
| 2847 |
return negative ? -t : t;
|
| 2848 |
} |
| 2849 |
|
| 2850 |
/**
|
| 2851 |
* Attempts to find a specific tag in a URL.
|
| 2852 |
*
|
| 2853 |
* syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
|
| 2854 |
* Return 1 if found.
|
| 2855 |
*/
|
| 2856 |
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info) |
| 2857 |
{
|
| 2858 |
const char *p; |
| 2859 |
char tag[128], *q; |
| 2860 |
|
| 2861 |
p = info; |
| 2862 |
if (*p == '?') |
| 2863 |
p++; |
| 2864 |
for(;;) {
|
| 2865 |
q = tag; |
| 2866 |
while (*p != '\0' && *p != '=' && *p != '&') { |
| 2867 |
if ((q - tag) < sizeof(tag) - 1) |
| 2868 |
*q++ = *p; |
| 2869 |
p++; |
| 2870 |
} |
| 2871 |
*q = '\0';
|
| 2872 |
q = arg; |
| 2873 |
if (*p == '=') { |
| 2874 |
p++; |
| 2875 |
while (*p != '&' && *p != '\0') { |
| 2876 |
if ((q - arg) < arg_size - 1) { |
| 2877 |
if (*p == '+') |
| 2878 |
*q++ = ' ';
|
| 2879 |
else
|
| 2880 |
*q++ = *p; |
| 2881 |
} |
| 2882 |
p++; |
| 2883 |
} |
| 2884 |
*q = '\0';
|
| 2885 |
} |
| 2886 |
if (!strcmp(tag, tag1))
|
| 2887 |
return 1; |
| 2888 |
if (*p != '&') |
| 2889 |
break;
|
| 2890 |
p++; |
| 2891 |
} |
| 2892 |
return 0; |
| 2893 |
} |
| 2894 |
|
| 2895 |
/**
|
| 2896 |
* Returns in 'buf' the path with '%d' replaced by number.
|
| 2897 |
*
|
| 2898 |
* Also handles the '%0nd' format where 'n' is the total number
|
| 2899 |
* of digits and '%%'. Return 0 if OK, and -1 if format error.
|
| 2900 |
*/
|
| 2901 |
int get_frame_filename(char *buf, int buf_size, |
| 2902 |
const char *path, int number) |
| 2903 |
{
|
| 2904 |
const char *p; |
| 2905 |
char *q, buf1[20], c; |
| 2906 |
int nd, len, percentd_found;
|
| 2907 |
|
| 2908 |
q = buf; |
| 2909 |
p = path; |
| 2910 |
percentd_found = 0;
|
| 2911 |
for(;;) {
|
| 2912 |
c = *p++; |
| 2913 |
if (c == '\0') |
| 2914 |
break;
|
| 2915 |
if (c == '%') { |
| 2916 |
do {
|
| 2917 |
nd = 0;
|
| 2918 |
while (isdigit(*p)) {
|
| 2919 |
nd = nd * 10 + *p++ - '0'; |
| 2920 |
} |
| 2921 |
c = *p++; |
| 2922 |
} while (isdigit(c));
|
| 2923 |
|
| 2924 |
switch(c) {
|
| 2925 |
case '%': |
| 2926 |
goto addchar;
|
| 2927 |
case 'd': |
| 2928 |
if (percentd_found)
|
| 2929 |
goto fail;
|
| 2930 |
percentd_found = 1;
|
| 2931 |
snprintf(buf1, sizeof(buf1), "%0*d", nd, number); |
| 2932 |
len = strlen(buf1); |
| 2933 |
if ((q - buf + len) > buf_size - 1) |
| 2934 |
goto fail;
|
| 2935 |
memcpy(q, buf1, len); |
| 2936 |
q += len; |
| 2937 |
break;
|
| 2938 |
default:
|
| 2939 |
goto fail;
|
| 2940 |
} |
| 2941 |
} else {
|
| 2942 |
addchar:
|
| 2943 |
if ((q - buf) < buf_size - 1) |
| 2944 |
*q++ = c; |
| 2945 |
} |
| 2946 |
} |
| 2947 |
if (!percentd_found)
|
| 2948 |
goto fail;
|
| 2949 |
*q = '\0';
|
| 2950 |
return 0; |
| 2951 |
fail:
|
| 2952 |
*q = '\0';
|
| 2953 |
return -1; |
| 2954 |
} |
| 2955 |
|
| 2956 |
/**
|
| 2957 |
* Print nice hexa dump of a buffer
|
| 2958 |
* @param f stream for output
|
| 2959 |
* @param buf buffer
|
| 2960 |
* @param size buffer size
|
| 2961 |
*/
|
| 2962 |
void av_hex_dump(FILE *f, uint8_t *buf, int size) |
| 2963 |
{
|
| 2964 |
int len, i, j, c;
|
| 2965 |
|
| 2966 |
for(i=0;i<size;i+=16) { |
| 2967 |
len = size - i; |
| 2968 |
if (len > 16) |
| 2969 |
len = 16;
|
| 2970 |
fprintf(f, "%08x ", i);
|
| 2971 |
for(j=0;j<16;j++) { |
| 2972 |
if (j < len)
|
| 2973 |
fprintf(f, " %02x", buf[i+j]);
|
| 2974 |
else
|
| 2975 |
fprintf(f, " ");
|
| 2976 |
} |
| 2977 |
fprintf(f, " ");
|
| 2978 |
for(j=0;j<len;j++) { |
| 2979 |
c = buf[i+j]; |
| 2980 |
if (c < ' ' || c > '~') |
| 2981 |
c = '.';
|
| 2982 |
fprintf(f, "%c", c);
|
| 2983 |
} |
| 2984 |
fprintf(f, "\n");
|
| 2985 |
} |
| 2986 |
} |
| 2987 |
|
| 2988 |
/**
|
| 2989 |
* Print on 'f' a nice dump of a packet
|
| 2990 |
* @param f stream for output
|
| 2991 |
* @param pkt packet to dump
|
| 2992 |
* @param dump_payload true if the payload must be displayed too
|
| 2993 |
*/
|
| 2994 |
//FIXME needs to know the time_base
|
| 2995 |
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload) |
| 2996 |
{
|
| 2997 |
fprintf(f, "stream #%d:\n", pkt->stream_index);
|
| 2998 |
fprintf(f, " keyframe=%d\n", ((pkt->flags & PKT_FLAG_KEY) != 0)); |
| 2999 |
fprintf(f, " duration=%0.3f\n", (double)pkt->duration / AV_TIME_BASE); |
| 3000 |
/* DTS is _always_ valid after av_read_frame() */
|
| 3001 |
fprintf(f, " dts=");
|
| 3002 |
if (pkt->dts == AV_NOPTS_VALUE)
|
| 3003 |
fprintf(f, "N/A");
|
| 3004 |
else
|
| 3005 |
fprintf(f, "%0.3f", (double)pkt->dts / AV_TIME_BASE); |
| 3006 |
/* PTS may be not known if B frames are present */
|
| 3007 |
fprintf(f, " pts=");
|
| 3008 |
if (pkt->pts == AV_NOPTS_VALUE)
|
| 3009 |
fprintf(f, "N/A");
|
| 3010 |
else
|
| 3011 |
fprintf(f, "%0.3f", (double)pkt->pts / AV_TIME_BASE); |
| 3012 |
fprintf(f, "\n");
|
| 3013 |
fprintf(f, " size=%d\n", pkt->size);
|
| 3014 |
if (dump_payload)
|
| 3015 |
av_hex_dump(f, pkt->data, pkt->size); |
| 3016 |
} |
| 3017 |
|
| 3018 |
void url_split(char *proto, int proto_size, |
| 3019 |
char *authorization, int authorization_size, |
| 3020 |
char *hostname, int hostname_size, |
| 3021 |
int *port_ptr,
|
| 3022 |
char *path, int path_size, |
| 3023 |
const char *url) |
| 3024 |
{
|
| 3025 |
const char *p; |
| 3026 |
char *q;
|
| 3027 |
int port;
|
| 3028 |
|
| 3029 |
port = -1;
|
| 3030 |
|
| 3031 |
p = url; |
| 3032 |
q = proto; |
| 3033 |
while (*p != ':' && *p != '\0') { |
| 3034 |
if ((q - proto) < proto_size - 1) |
| 3035 |
*q++ = *p; |
| 3036 |
p++; |
| 3037 |
} |
| 3038 |
if (proto_size > 0) |
| 3039 |
*q = '\0';
|
| 3040 |
if (authorization_size > 0) |
| 3041 |
authorization[0] = '\0'; |
| 3042 |
if (*p == '\0') { |
| 3043 |
if (proto_size > 0) |
| 3044 |
proto[0] = '\0'; |
| 3045 |
if (hostname_size > 0) |
| 3046 |
hostname[0] = '\0'; |
| 3047 |
p = url; |
| 3048 |
} else {
|
| 3049 |
char *at,*slash; // PETR: position of '@' character and '/' character |
| 3050 |
|
| 3051 |
p++; |
| 3052 |
if (*p == '/') |
| 3053 |
p++; |
| 3054 |
if (*p == '/') |
| 3055 |
p++; |
| 3056 |
at = strchr(p,'@'); // PETR: get the position of '@' |
| 3057 |
slash = strchr(p,'/'); // PETR: get position of '/' - end of hostname |
| 3058 |
if (at && slash && at > slash) at = NULL; // PETR: not interested in '@' behind '/' |
| 3059 |
|
| 3060 |
q = at ? authorization : hostname; // PETR: if '@' exists starting with auth.
|
| 3061 |
|
| 3062 |
while ((at || *p != ':') && *p != '/' && *p != '?' && *p != '\0') { // PETR: |
| 3063 |
if (*p == '@') { // PETR: passed '@' |
| 3064 |
if (authorization_size > 0) |
| 3065 |
*q = '\0';
|
| 3066 |
q = hostname; |
| 3067 |
at = NULL;
|
| 3068 |
} else if (!at) { // PETR: hostname |
| 3069 |
if ((q - hostname) < hostname_size - 1) |
| 3070 |
*q++ = *p; |
| 3071 |
} else {
|
| 3072 |
if ((q - authorization) < authorization_size - 1) |
| 3073 |
*q++ = *p; |
| 3074 |
} |
| 3075 |
p++; |
| 3076 |
} |
| 3077 |
if (hostname_size > 0) |
| 3078 |
*q = '\0';
|
| 3079 |
if (*p == ':') { |
| 3080 |
p++; |
| 3081 |
port = strtoul(p, (char **)&p, 10); |
| 3082 |
} |
| 3083 |
} |
| 3084 |
if (port_ptr)
|
| 3085 |
*port_ptr = port; |
| 3086 |
pstrcpy(path, path_size, p); |
| 3087 |
} |
| 3088 |
|
| 3089 |
/**
|
| 3090 |
* Set the pts for a given stream.
|
| 3091 |
*
|
| 3092 |
* @param s stream
|
| 3093 |
* @param pts_wrap_bits number of bits effectively used by the pts
|
| 3094 |
* (used for wrap control, 33 is the value for MPEG)
|
| 3095 |
* @param pts_num numerator to convert to seconds (MPEG: 1)
|
| 3096 |
* @param pts_den denominator to convert to seconds (MPEG: 90000)
|
| 3097 |
*/
|
| 3098 |
void av_set_pts_info(AVStream *s, int pts_wrap_bits, |
| 3099 |
int pts_num, int pts_den) |
| 3100 |
{
|
| 3101 |
s->pts_wrap_bits = pts_wrap_bits; |
| 3102 |
s->time_base.num = pts_num; |
| 3103 |
s->time_base.den = pts_den; |
| 3104 |
} |
| 3105 |
|
| 3106 |
/* fraction handling */
|
| 3107 |
|
| 3108 |
/**
|
| 3109 |
* f = val + (num / den) + 0.5.
|
| 3110 |
*
|
| 3111 |
* 'num' is normalized so that it is such as 0 <= num < den.
|
| 3112 |
*
|
| 3113 |
* @param f fractional number
|
| 3114 |
* @param val integer value
|
| 3115 |
* @param num must be >= 0
|
| 3116 |
* @param den must be >= 1
|
| 3117 |
*/
|
| 3118 |
void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
|
| 3119 |
{
|
| 3120 |
num += (den >> 1);
|
| 3121 |
if (num >= den) {
|
| 3122 |
val += num / den; |
| 3123 |
num = num % den; |
| 3124 |
} |
| 3125 |
f->val = val; |
| 3126 |
f->num = num; |
| 3127 |
f->den = den; |
| 3128 |
} |
| 3129 |
|
| 3130 |
/**
|
| 3131 |
* Set f to (val + 0.5).
|
| 3132 |
*/
|
| 3133 |
void av_frac_set(AVFrac *f, int64_t val)
|
| 3134 |
{
|
| 3135 |
f->val = val; |
| 3136 |
f->num = f->den >> 1;
|
| 3137 |
} |
| 3138 |
|
| 3139 |
/**
|
| 3140 |
* Fractionnal addition to f: f = f + (incr / f->den).
|
| 3141 |
*
|
| 3142 |
* @param f fractional number
|
| 3143 |
* @param incr increment, can be positive or negative
|
| 3144 |
*/
|
| 3145 |
void av_frac_add(AVFrac *f, int64_t incr)
|
| 3146 |
{
|
| 3147 |
int64_t num, den; |
| 3148 |
|
| 3149 |
num = f->num + incr; |
| 3150 |
den = f->den; |
| 3151 |
if (num < 0) { |
| 3152 |
f->val += num / den; |
| 3153 |
num = num % den; |
| 3154 |
if (num < 0) { |
| 3155 |
num += den; |
| 3156 |
f->val--; |
| 3157 |
} |
| 3158 |
} else if (num >= den) { |
| 3159 |
f->val += num / den; |
| 3160 |
num = num % den; |
| 3161 |
} |
| 3162 |
f->num = num; |
| 3163 |
} |
| 3164 |
|
| 3165 |
/**
|
| 3166 |
* register a new image format
|
| 3167 |
* @param img_fmt Image format descriptor
|
| 3168 |
*/
|
| 3169 |
void av_register_image_format(AVImageFormat *img_fmt)
|
| 3170 |
{
|
| 3171 |
AVImageFormat **p; |
| 3172 |
|
| 3173 |
p = &first_image_format; |
| 3174 |
while (*p != NULL) p = &(*p)->next; |
| 3175 |
*p = img_fmt; |
| 3176 |
img_fmt->next = NULL;
|
| 3177 |
} |
| 3178 |
|
| 3179 |
/**
|
| 3180 |
* Guesses image format based on data in the image.
|
| 3181 |
*/
|
| 3182 |
AVImageFormat *av_probe_image_format(AVProbeData *pd) |
| 3183 |
{
|
| 3184 |
AVImageFormat *fmt1, *fmt; |
| 3185 |
int score, score_max;
|
| 3186 |
|
| 3187 |
fmt = NULL;
|
| 3188 |
score_max = 0;
|
| 3189 |
for(fmt1 = first_image_format; fmt1 != NULL; fmt1 = fmt1->next) { |
| 3190 |
if (fmt1->img_probe) {
|
| 3191 |
score = fmt1->img_probe(pd); |
| 3192 |
if (score > score_max) {
|
| 3193 |
score_max = score; |
| 3194 |
fmt = fmt1; |
| 3195 |
} |
| 3196 |
} |
| 3197 |
} |
| 3198 |
return fmt;
|
| 3199 |
} |
| 3200 |
|
| 3201 |
/**
|
| 3202 |
* Guesses image format based on file name extensions.
|
| 3203 |
*/
|
| 3204 |
AVImageFormat *guess_image_format(const char *filename) |
| 3205 |
{
|
| 3206 |
AVImageFormat *fmt1; |
| 3207 |
|
| 3208 |
for(fmt1 = first_image_format; fmt1 != NULL; fmt1 = fmt1->next) { |
| 3209 |
if (fmt1->extensions && match_ext(filename, fmt1->extensions))
|
| 3210 |
return fmt1;
|
| 3211 |
} |
| 3212 |
return NULL; |
| 3213 |
} |
| 3214 |
|
| 3215 |
/**
|
| 3216 |
* Read an image from a stream.
|
| 3217 |
* @param gb byte stream containing the image
|
| 3218 |
* @param fmt image format, NULL if probing is required
|
| 3219 |
*/
|
| 3220 |
int av_read_image(ByteIOContext *pb, const char *filename, |
| 3221 |
AVImageFormat *fmt, |
| 3222 |
int (*alloc_cb)(void *, AVImageInfo *info), void *opaque) |
| 3223 |
{
|
| 3224 |
char buf[PROBE_BUF_SIZE];
|
| 3225 |
AVProbeData probe_data, *pd = &probe_data; |
| 3226 |
offset_t pos; |
| 3227 |
int ret;
|
| 3228 |
|
| 3229 |
if (!fmt) {
|
| 3230 |
pd->filename = filename; |
| 3231 |
pd->buf = buf; |
| 3232 |
pos = url_ftell(pb); |
| 3233 |
pd->buf_size = get_buffer(pb, buf, PROBE_BUF_SIZE); |
| 3234 |
url_fseek(pb, pos, SEEK_SET); |
| 3235 |
fmt = av_probe_image_format(pd); |
| 3236 |
} |
| 3237 |
if (!fmt)
|
| 3238 |
return AVERROR_NOFMT;
|
| 3239 |
ret = fmt->img_read(pb, alloc_cb, opaque); |
| 3240 |
return ret;
|
| 3241 |
} |
| 3242 |
|
| 3243 |
/**
|
| 3244 |
* Write an image to a stream.
|
| 3245 |
* @param pb byte stream for the image output
|
| 3246 |
* @param fmt image format
|
| 3247 |
* @param img image data and informations
|
| 3248 |
*/
|
| 3249 |
int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img)
|
| 3250 |
{
|
| 3251 |
return fmt->img_write(pb, img);
|
| 3252 |
} |
| 3253 |
|