ffmpeg / libavformat / aviobuf.c @ d4e321d9
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/*
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* Buffered I/O for ffmpeg system
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* Copyright (c) 2000,2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; 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 "libavutil/crc.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "avio.h" |
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#include "avio_internal.h" |
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#include "internal.h" |
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#include <stdarg.h> |
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#define IO_BUFFER_SIZE 32768 |
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/**
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* Do seeks within this distance ahead of the current buffer by skipping
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* data instead of calling the protocol seek function, for seekable
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* protocols.
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*/
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#define SHORT_SEEK_THRESHOLD 4096 |
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static void fill_buffer(AVIOContext *s); |
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#if !FF_API_URL_RESETBUF
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static int url_resetbuf(AVIOContext *s, int flags); |
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#endif
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int ffio_init_context(AVIOContext *s,
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unsigned char *buffer, |
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
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{ |
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s->buffer = buffer; |
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s->buffer_size = buffer_size; |
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s->buf_ptr = buffer; |
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s->opaque = opaque; |
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url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY); |
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s->write_packet = write_packet; |
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s->read_packet = read_packet; |
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s->seek = seek; |
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s->pos = 0;
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s->must_flush = 0;
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s->eof_reached = 0;
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s->error = 0;
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s->is_streamed = 0;
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s->max_packet_size = 0;
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s->update_checksum= NULL;
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if(!read_packet && !write_flag){
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s->pos = buffer_size; |
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s->buf_end = s->buffer + buffer_size; |
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} |
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s->read_pause = NULL;
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s->read_seek = NULL;
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return 0; |
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} |
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#if FF_API_OLD_AVIO
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int init_put_byte(AVIOContext *s,
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unsigned char *buffer, |
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
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{ |
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return ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
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read_packet, write_packet, seek); |
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} |
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AVIOContext *av_alloc_put_byte( |
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unsigned char *buffer, |
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
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{ |
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return avio_alloc_context(buffer, buffer_size, write_flag, opaque,
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read_packet, write_packet, seek); |
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} |
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#endif
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AVIOContext *avio_alloc_context( |
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unsigned char *buffer, |
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
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{ |
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AVIOContext *s = av_mallocz(sizeof(AVIOContext));
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ffio_init_context(s, buffer, buffer_size, write_flag, opaque, |
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read_packet, write_packet, seek); |
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return s;
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} |
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static void flush_buffer(AVIOContext *s) |
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{ |
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if (s->buf_ptr > s->buffer) {
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if (s->write_packet && !s->error){
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int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
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if(ret < 0){ |
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s->error = ret; |
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} |
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} |
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if(s->update_checksum){
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s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr); |
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s->checksum_ptr= s->buffer; |
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} |
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s->pos += s->buf_ptr - s->buffer; |
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} |
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s->buf_ptr = s->buffer; |
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} |
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void put_byte(AVIOContext *s, int b) |
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{ |
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*(s->buf_ptr)++ = b; |
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if (s->buf_ptr >= s->buf_end)
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flush_buffer(s); |
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} |
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void put_nbyte(AVIOContext *s, int b, int count) |
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{ |
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while (count > 0) { |
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int len = FFMIN(s->buf_end - s->buf_ptr, count);
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memset(s->buf_ptr, b, len); |
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s->buf_ptr += len; |
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if (s->buf_ptr >= s->buf_end)
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flush_buffer(s); |
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count -= len; |
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} |
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} |
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void put_buffer(AVIOContext *s, const unsigned char *buf, int size) |
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{ |
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while (size > 0) { |
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int len = FFMIN(s->buf_end - s->buf_ptr, size);
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memcpy(s->buf_ptr, buf, len); |
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s->buf_ptr += len; |
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if (s->buf_ptr >= s->buf_end)
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flush_buffer(s); |
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buf += len; |
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size -= len; |
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} |
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} |
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void put_flush_packet(AVIOContext *s)
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{ |
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flush_buffer(s); |
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s->must_flush = 0;
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} |
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int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
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{ |
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int64_t offset1; |
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int64_t pos; |
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int force = whence & AVSEEK_FORCE;
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whence &= ~AVSEEK_FORCE; |
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if(!s)
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return AVERROR(EINVAL);
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pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
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if (whence != SEEK_CUR && whence != SEEK_SET)
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return AVERROR(EINVAL);
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if (whence == SEEK_CUR) {
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offset1 = pos + (s->buf_ptr - s->buffer); |
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if (offset == 0) |
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return offset1;
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offset += offset1; |
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} |
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offset1 = offset - pos; |
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if (!s->must_flush &&
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offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
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/* can do the seek inside the buffer */
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s->buf_ptr = s->buffer + offset1; |
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} else if ((s->is_streamed || |
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offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) && |
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!s->write_flag && offset1 >= 0 &&
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(whence != SEEK_END || force)) { |
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while(s->pos < offset && !s->eof_reached)
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fill_buffer(s); |
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if (s->eof_reached)
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return AVERROR_EOF;
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s->buf_ptr = s->buf_end + offset - s->pos; |
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} else {
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int64_t res; |
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#if CONFIG_MUXERS || CONFIG_NETWORK
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if (s->write_flag) {
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flush_buffer(s); |
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s->must_flush = 1;
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} |
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#endif /* CONFIG_MUXERS || CONFIG_NETWORK */ |
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if (!s->seek)
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return AVERROR(EPIPE);
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if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0) |
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return res;
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if (!s->write_flag)
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s->buf_end = s->buffer; |
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s->buf_ptr = s->buffer; |
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s->pos = offset; |
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} |
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s->eof_reached = 0;
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return offset;
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} |
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int url_fskip(AVIOContext *s, int64_t offset)
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{ |
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int64_t ret = url_fseek(s, offset, SEEK_CUR); |
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return ret < 0 ? ret : 0; |
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} |
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int64_t url_ftell(AVIOContext *s) |
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{ |
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return url_fseek(s, 0, SEEK_CUR); |
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} |
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int64_t url_fsize(AVIOContext *s) |
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{ |
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int64_t size; |
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if(!s)
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return AVERROR(EINVAL);
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if (!s->seek)
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return AVERROR(ENOSYS);
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size = s->seek(s->opaque, 0, AVSEEK_SIZE);
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if(size<0){ |
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if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0) |
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return size;
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size++; |
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s->seek(s->opaque, s->pos, SEEK_SET); |
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} |
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return size;
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} |
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int url_feof(AVIOContext *s)
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{ |
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if(!s)
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return 0; |
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return s->eof_reached;
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} |
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int url_ferror(AVIOContext *s)
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{ |
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if(!s)
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return 0; |
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return s->error;
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} |
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void put_le32(AVIOContext *s, unsigned int val) |
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{ |
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put_byte(s, val); |
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put_byte(s, val >> 8);
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put_byte(s, val >> 16);
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put_byte(s, val >> 24);
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} |
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void put_be32(AVIOContext *s, unsigned int val) |
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{ |
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put_byte(s, val >> 24);
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put_byte(s, val >> 16);
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put_byte(s, val >> 8);
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put_byte(s, val); |
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} |
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#if FF_API_OLD_AVIO
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void put_strz(AVIOContext *s, const char *str) |
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{ |
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avio_put_str(s, str); |
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} |
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#define GET(name, type) \
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type get_be ##name(AVIOContext *s) \ |
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{\ |
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return avio_rb ##name(s);\ |
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}\ |
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type get_le ##name(AVIOContext *s) \ |
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{\ |
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return avio_rl ##name(s);\ |
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} |
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GET(16, unsigned int) |
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GET(24, unsigned int) |
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GET(32, unsigned int) |
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GET(64, uint64_t)
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#undef GET
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int get_byte(AVIOContext *s)
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{ |
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return avio_r8(s);
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} |
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int get_buffer(AVIOContext *s, unsigned char *buf, int size) |
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{ |
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return avio_read(s, buf, size);
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} |
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int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size) |
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{ |
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return ffio_read_partial(s, buf, size);
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} |
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#endif
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int avio_put_str(AVIOContext *s, const char *str) |
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{ |
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int len = 1; |
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if (str) {
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len += strlen(str); |
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put_buffer(s, (const unsigned char *) str, len); |
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} else
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put_byte(s, 0);
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return len;
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} |
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int avio_put_str16le(AVIOContext *s, const char *str) |
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{ |
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const uint8_t *q = str;
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int ret = 0; |
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while (*q) {
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uint32_t ch; |
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uint16_t tmp; |
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GET_UTF8(ch, *q++, break;)
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PUT_UTF16(ch, tmp, put_le16(s, tmp);ret += 2;)
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} |
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put_le16(s, 0);
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ret += 2;
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return ret;
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} |
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int ff_get_v_length(uint64_t val){
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int i=1; |
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while(val>>=7) |
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i++; |
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return i;
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} |
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void ff_put_v(AVIOContext *bc, uint64_t val){
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int i= ff_get_v_length(val);
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while(--i>0) |
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put_byte(bc, 128 | (val>>(7*i))); |
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put_byte(bc, val&127);
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} |
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void put_le64(AVIOContext *s, uint64_t val)
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{ |
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put_le32(s, (uint32_t)(val & 0xffffffff));
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put_le32(s, (uint32_t)(val >> 32));
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} |
384 |
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void put_be64(AVIOContext *s, uint64_t val)
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{ |
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put_be32(s, (uint32_t)(val >> 32));
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put_be32(s, (uint32_t)(val & 0xffffffff));
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} |
390 |
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void put_le16(AVIOContext *s, unsigned int val) |
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{ |
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put_byte(s, val); |
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put_byte(s, val >> 8);
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} |
396 |
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void put_be16(AVIOContext *s, unsigned int val) |
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{ |
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put_byte(s, val >> 8);
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put_byte(s, val); |
401 |
} |
402 |
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void put_le24(AVIOContext *s, unsigned int val) |
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{ |
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put_le16(s, val & 0xffff);
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put_byte(s, val >> 16);
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} |
408 |
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void put_be24(AVIOContext *s, unsigned int val) |
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{ |
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put_be16(s, val >> 8);
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put_byte(s, val); |
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} |
414 |
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void put_tag(AVIOContext *s, const char *tag) |
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{ |
417 |
while (*tag) {
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put_byte(s, *tag++); |
419 |
} |
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} |
421 |
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/* Input stream */
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static void fill_buffer(AVIOContext *s) |
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{ |
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uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer; |
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int len= s->buffer_size - (dst - s->buffer);
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int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
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429 |
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/* no need to do anything if EOF already reached */
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431 |
if (s->eof_reached)
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return;
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|
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if(s->update_checksum && dst == s->buffer){
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if(s->buf_end > s->checksum_ptr)
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s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr); |
437 |
s->checksum_ptr= s->buffer; |
438 |
} |
439 |
|
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/* make buffer smaller in case it ended up large after probing */
|
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if (s->buffer_size > max_buffer_size) {
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url_setbufsize(s, max_buffer_size); |
443 |
|
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s->checksum_ptr = dst = s->buffer; |
445 |
len = s->buffer_size; |
446 |
} |
447 |
|
448 |
if(s->read_packet)
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449 |
len = s->read_packet(s->opaque, dst, len); |
450 |
else
|
451 |
len = 0;
|
452 |
if (len <= 0) { |
453 |
/* do not modify buffer if EOF reached so that a seek back can
|
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be done without rereading data */
|
455 |
s->eof_reached = 1;
|
456 |
if(len<0) |
457 |
s->error= len; |
458 |
} else {
|
459 |
s->pos += len; |
460 |
s->buf_ptr = dst; |
461 |
s->buf_end = dst + len; |
462 |
} |
463 |
} |
464 |
|
465 |
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, |
466 |
unsigned int len) |
467 |
{ |
468 |
return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
|
469 |
} |
470 |
|
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unsigned long get_checksum(AVIOContext *s) |
472 |
{ |
473 |
s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr); |
474 |
s->update_checksum= NULL;
|
475 |
return s->checksum;
|
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} |
477 |
|
478 |
void init_checksum(AVIOContext *s,
|
479 |
unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), |
480 |
unsigned long checksum) |
481 |
{ |
482 |
s->update_checksum= update_checksum; |
483 |
if(s->update_checksum){
|
484 |
s->checksum= checksum; |
485 |
s->checksum_ptr= s->buf_ptr; |
486 |
} |
487 |
} |
488 |
|
489 |
/* XXX: put an inline version */
|
490 |
int avio_r8(AVIOContext *s)
|
491 |
{ |
492 |
if (s->buf_ptr >= s->buf_end)
|
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fill_buffer(s); |
494 |
if (s->buf_ptr < s->buf_end)
|
495 |
return *s->buf_ptr++;
|
496 |
return 0; |
497 |
} |
498 |
|
499 |
int url_fgetc(AVIOContext *s)
|
500 |
{ |
501 |
if (s->buf_ptr >= s->buf_end)
|
502 |
fill_buffer(s); |
503 |
if (s->buf_ptr < s->buf_end)
|
504 |
return *s->buf_ptr++;
|
505 |
return URL_EOF;
|
506 |
} |
507 |
|
508 |
int avio_read(AVIOContext *s, unsigned char *buf, int size) |
509 |
{ |
510 |
int len, size1;
|
511 |
|
512 |
size1 = size; |
513 |
while (size > 0) { |
514 |
len = s->buf_end - s->buf_ptr; |
515 |
if (len > size)
|
516 |
len = size; |
517 |
if (len == 0) { |
518 |
if(size > s->buffer_size && !s->update_checksum){
|
519 |
if(s->read_packet)
|
520 |
len = s->read_packet(s->opaque, buf, size); |
521 |
if (len <= 0) { |
522 |
/* do not modify buffer if EOF reached so that a seek back can
|
523 |
be done without rereading data */
|
524 |
s->eof_reached = 1;
|
525 |
if(len<0) |
526 |
s->error= len; |
527 |
break;
|
528 |
} else {
|
529 |
s->pos += len; |
530 |
size -= len; |
531 |
buf += len; |
532 |
s->buf_ptr = s->buffer; |
533 |
s->buf_end = s->buffer/* + len*/;
|
534 |
} |
535 |
}else{
|
536 |
fill_buffer(s); |
537 |
len = s->buf_end - s->buf_ptr; |
538 |
if (len == 0) |
539 |
break;
|
540 |
} |
541 |
} else {
|
542 |
memcpy(buf, s->buf_ptr, len); |
543 |
buf += len; |
544 |
s->buf_ptr += len; |
545 |
size -= len; |
546 |
} |
547 |
} |
548 |
if (size1 == size) {
|
549 |
if (url_ferror(s)) return url_ferror(s); |
550 |
if (url_feof(s)) return AVERROR_EOF; |
551 |
} |
552 |
return size1 - size;
|
553 |
} |
554 |
|
555 |
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size) |
556 |
{ |
557 |
int len;
|
558 |
|
559 |
if(size<0) |
560 |
return -1; |
561 |
|
562 |
len = s->buf_end - s->buf_ptr; |
563 |
if (len == 0) { |
564 |
fill_buffer(s); |
565 |
len = s->buf_end - s->buf_ptr; |
566 |
} |
567 |
if (len > size)
|
568 |
len = size; |
569 |
memcpy(buf, s->buf_ptr, len); |
570 |
s->buf_ptr += len; |
571 |
if (!len) {
|
572 |
if (url_ferror(s)) return url_ferror(s); |
573 |
if (url_feof(s)) return AVERROR_EOF; |
574 |
} |
575 |
return len;
|
576 |
} |
577 |
|
578 |
unsigned int avio_rl16(AVIOContext *s) |
579 |
{ |
580 |
unsigned int val; |
581 |
val = avio_r8(s); |
582 |
val |= avio_r8(s) << 8;
|
583 |
return val;
|
584 |
} |
585 |
|
586 |
unsigned int avio_rl24(AVIOContext *s) |
587 |
{ |
588 |
unsigned int val; |
589 |
val = avio_rl16(s); |
590 |
val |= avio_r8(s) << 16;
|
591 |
return val;
|
592 |
} |
593 |
|
594 |
unsigned int avio_rl32(AVIOContext *s) |
595 |
{ |
596 |
unsigned int val; |
597 |
val = avio_rl16(s); |
598 |
val |= avio_rl16(s) << 16;
|
599 |
return val;
|
600 |
} |
601 |
|
602 |
uint64_t avio_rl64(AVIOContext *s) |
603 |
{ |
604 |
uint64_t val; |
605 |
val = (uint64_t)avio_rl32(s); |
606 |
val |= (uint64_t)avio_rl32(s) << 32;
|
607 |
return val;
|
608 |
} |
609 |
|
610 |
unsigned int avio_rb16(AVIOContext *s) |
611 |
{ |
612 |
unsigned int val; |
613 |
val = avio_r8(s) << 8;
|
614 |
val |= avio_r8(s); |
615 |
return val;
|
616 |
} |
617 |
|
618 |
unsigned int avio_rb24(AVIOContext *s) |
619 |
{ |
620 |
unsigned int val; |
621 |
val = avio_rb16(s) << 8;
|
622 |
val |= avio_r8(s); |
623 |
return val;
|
624 |
} |
625 |
unsigned int avio_rb32(AVIOContext *s) |
626 |
{ |
627 |
unsigned int val; |
628 |
val = avio_rb16(s) << 16;
|
629 |
val |= avio_rb16(s); |
630 |
return val;
|
631 |
} |
632 |
|
633 |
char *get_strz(AVIOContext *s, char *buf, int maxlen) |
634 |
{ |
635 |
int i = 0; |
636 |
char c;
|
637 |
|
638 |
while ((c = avio_r8(s))) {
|
639 |
if (i < maxlen-1) |
640 |
buf[i++] = c; |
641 |
} |
642 |
|
643 |
buf[i] = 0; /* Ensure null terminated, but may be truncated */ |
644 |
|
645 |
return buf;
|
646 |
} |
647 |
|
648 |
int ff_get_line(AVIOContext *s, char *buf, int maxlen) |
649 |
{ |
650 |
int i = 0; |
651 |
char c;
|
652 |
|
653 |
do {
|
654 |
c = avio_r8(s); |
655 |
if (c && i < maxlen-1) |
656 |
buf[i++] = c; |
657 |
} while (c != '\n' && c); |
658 |
|
659 |
buf[i] = 0;
|
660 |
return i;
|
661 |
} |
662 |
|
663 |
#define GET_STR16(type, read) \
|
664 |
int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\ |
665 |
{\ |
666 |
char* q = buf;\
|
667 |
int ret = 0;\ |
668 |
while (ret + 1 < maxlen) {\ |
669 |
uint8_t tmp;\ |
670 |
uint32_t ch;\ |
671 |
GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\ |
672 |
if (!ch)\
|
673 |
break;\
|
674 |
PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\ |
675 |
}\ |
676 |
*q = 0;\
|
677 |
return ret;\
|
678 |
}\ |
679 |
|
680 |
GET_STR16(le, avio_rl16) |
681 |
GET_STR16(be, avio_rb16) |
682 |
|
683 |
#undef GET_STR16
|
684 |
|
685 |
uint64_t avio_rb64(AVIOContext *s) |
686 |
{ |
687 |
uint64_t val; |
688 |
val = (uint64_t)avio_rb32(s) << 32;
|
689 |
val |= (uint64_t)avio_rb32(s); |
690 |
return val;
|
691 |
} |
692 |
|
693 |
uint64_t ff_get_v(AVIOContext *bc){ |
694 |
uint64_t val = 0;
|
695 |
int tmp;
|
696 |
|
697 |
do{
|
698 |
tmp = avio_r8(bc); |
699 |
val= (val<<7) + (tmp&127); |
700 |
}while(tmp&128); |
701 |
return val;
|
702 |
} |
703 |
|
704 |
int url_fdopen(AVIOContext **s, URLContext *h)
|
705 |
{ |
706 |
uint8_t *buffer; |
707 |
int buffer_size, max_packet_size;
|
708 |
|
709 |
max_packet_size = url_get_max_packet_size(h); |
710 |
if (max_packet_size) {
|
711 |
buffer_size = max_packet_size; /* no need to bufferize more than one packet */
|
712 |
} else {
|
713 |
buffer_size = IO_BUFFER_SIZE; |
714 |
} |
715 |
buffer = av_malloc(buffer_size); |
716 |
if (!buffer)
|
717 |
return AVERROR(ENOMEM);
|
718 |
|
719 |
*s = av_mallocz(sizeof(AVIOContext));
|
720 |
if(!*s) {
|
721 |
av_free(buffer); |
722 |
return AVERROR(ENOMEM);
|
723 |
} |
724 |
|
725 |
if (ffio_init_context(*s, buffer, buffer_size,
|
726 |
(h->flags & URL_WRONLY || h->flags & URL_RDWR), h, |
727 |
url_read, url_write, url_seek) < 0) {
|
728 |
av_free(buffer); |
729 |
av_freep(s); |
730 |
return AVERROR(EIO);
|
731 |
} |
732 |
(*s)->is_streamed = h->is_streamed; |
733 |
(*s)->max_packet_size = max_packet_size; |
734 |
if(h->prot) {
|
735 |
(*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause; |
736 |
(*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek; |
737 |
} |
738 |
return 0; |
739 |
} |
740 |
|
741 |
int url_setbufsize(AVIOContext *s, int buf_size) |
742 |
{ |
743 |
uint8_t *buffer; |
744 |
buffer = av_malloc(buf_size); |
745 |
if (!buffer)
|
746 |
return AVERROR(ENOMEM);
|
747 |
|
748 |
av_free(s->buffer); |
749 |
s->buffer = buffer; |
750 |
s->buffer_size = buf_size; |
751 |
s->buf_ptr = buffer; |
752 |
url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY); |
753 |
return 0; |
754 |
} |
755 |
|
756 |
#if FF_API_URL_RESETBUF
|
757 |
int url_resetbuf(AVIOContext *s, int flags) |
758 |
#else
|
759 |
static int url_resetbuf(AVIOContext *s, int flags) |
760 |
#endif
|
761 |
{ |
762 |
#if FF_API_URL_RESETBUF
|
763 |
if (flags & URL_RDWR)
|
764 |
return AVERROR(EINVAL);
|
765 |
#else
|
766 |
assert(flags == URL_WRONLY || flags == URL_RDONLY); |
767 |
#endif
|
768 |
|
769 |
if (flags & URL_WRONLY) {
|
770 |
s->buf_end = s->buffer + s->buffer_size; |
771 |
s->write_flag = 1;
|
772 |
} else {
|
773 |
s->buf_end = s->buffer; |
774 |
s->write_flag = 0;
|
775 |
} |
776 |
return 0; |
777 |
} |
778 |
|
779 |
int ff_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size) |
780 |
{ |
781 |
int64_t buffer_start; |
782 |
int buffer_size;
|
783 |
int overlap, new_size, alloc_size;
|
784 |
|
785 |
if (s->write_flag)
|
786 |
return AVERROR(EINVAL);
|
787 |
|
788 |
buffer_size = s->buf_end - s->buffer; |
789 |
|
790 |
/* the buffers must touch or overlap */
|
791 |
if ((buffer_start = s->pos - buffer_size) > buf_size)
|
792 |
return AVERROR(EINVAL);
|
793 |
|
794 |
overlap = buf_size - buffer_start; |
795 |
new_size = buf_size + buffer_size - overlap; |
796 |
|
797 |
alloc_size = FFMAX(s->buffer_size, new_size); |
798 |
if (alloc_size > buf_size)
|
799 |
if (!(buf = av_realloc(buf, alloc_size)))
|
800 |
return AVERROR(ENOMEM);
|
801 |
|
802 |
if (new_size > buf_size) {
|
803 |
memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap); |
804 |
buf_size = new_size; |
805 |
} |
806 |
|
807 |
av_free(s->buffer); |
808 |
s->buf_ptr = s->buffer = buf; |
809 |
s->buffer_size = alloc_size; |
810 |
s->pos = buf_size; |
811 |
s->buf_end = s->buf_ptr + buf_size; |
812 |
s->eof_reached = 0;
|
813 |
s->must_flush = 0;
|
814 |
|
815 |
return 0; |
816 |
} |
817 |
|
818 |
int url_fopen(AVIOContext **s, const char *filename, int flags) |
819 |
{ |
820 |
URLContext *h; |
821 |
int err;
|
822 |
|
823 |
err = url_open(&h, filename, flags); |
824 |
if (err < 0) |
825 |
return err;
|
826 |
err = url_fdopen(s, h); |
827 |
if (err < 0) { |
828 |
url_close(h); |
829 |
return err;
|
830 |
} |
831 |
return 0; |
832 |
} |
833 |
|
834 |
int url_fclose(AVIOContext *s)
|
835 |
{ |
836 |
URLContext *h = s->opaque; |
837 |
|
838 |
av_free(s->buffer); |
839 |
av_free(s); |
840 |
return url_close(h);
|
841 |
} |
842 |
|
843 |
URLContext *url_fileno(AVIOContext *s) |
844 |
{ |
845 |
return s->opaque;
|
846 |
} |
847 |
|
848 |
#if CONFIG_MUXERS
|
849 |
int url_fprintf(AVIOContext *s, const char *fmt, ...) |
850 |
{ |
851 |
va_list ap; |
852 |
char buf[4096]; |
853 |
int ret;
|
854 |
|
855 |
va_start(ap, fmt); |
856 |
ret = vsnprintf(buf, sizeof(buf), fmt, ap);
|
857 |
va_end(ap); |
858 |
put_buffer(s, buf, strlen(buf)); |
859 |
return ret;
|
860 |
} |
861 |
#endif //CONFIG_MUXERS |
862 |
|
863 |
char *url_fgets(AVIOContext *s, char *buf, int buf_size) |
864 |
{ |
865 |
int c;
|
866 |
char *q;
|
867 |
|
868 |
c = url_fgetc(s); |
869 |
if (c == EOF) |
870 |
return NULL; |
871 |
q = buf; |
872 |
for(;;) {
|
873 |
if (c == EOF || c == '\n') |
874 |
break;
|
875 |
if ((q - buf) < buf_size - 1) |
876 |
*q++ = c; |
877 |
c = url_fgetc(s); |
878 |
} |
879 |
if (buf_size > 0) |
880 |
*q = '\0';
|
881 |
return buf;
|
882 |
} |
883 |
|
884 |
int url_fget_max_packet_size(AVIOContext *s)
|
885 |
{ |
886 |
return s->max_packet_size;
|
887 |
} |
888 |
|
889 |
int av_url_read_fpause(AVIOContext *s, int pause) |
890 |
{ |
891 |
if (!s->read_pause)
|
892 |
return AVERROR(ENOSYS);
|
893 |
return s->read_pause(s->opaque, pause);
|
894 |
} |
895 |
|
896 |
int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
|
897 |
int64_t timestamp, int flags)
|
898 |
{ |
899 |
URLContext *h = s->opaque; |
900 |
int64_t ret; |
901 |
if (!s->read_seek)
|
902 |
return AVERROR(ENOSYS);
|
903 |
ret = s->read_seek(h, stream_index, timestamp, flags); |
904 |
if(ret >= 0) { |
905 |
int64_t pos; |
906 |
s->buf_ptr = s->buf_end; // Flush buffer
|
907 |
pos = s->seek(h, 0, SEEK_CUR);
|
908 |
if (pos >= 0) |
909 |
s->pos = pos; |
910 |
else if (pos != AVERROR(ENOSYS)) |
911 |
ret = pos; |
912 |
} |
913 |
return ret;
|
914 |
} |
915 |
|
916 |
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
|
917 |
* back to the server even if CONFIG_MUXERS is false. */
|
918 |
#if CONFIG_MUXERS || CONFIG_NETWORK
|
919 |
/* buffer handling */
|
920 |
int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags) |
921 |
{ |
922 |
int ret;
|
923 |
*s = av_mallocz(sizeof(AVIOContext));
|
924 |
if(!*s)
|
925 |
return AVERROR(ENOMEM);
|
926 |
ret = ffio_init_context(*s, buf, buf_size, |
927 |
(flags & URL_WRONLY || flags & URL_RDWR), |
928 |
NULL, NULL, NULL, NULL); |
929 |
if(ret != 0) |
930 |
av_freep(s); |
931 |
return ret;
|
932 |
} |
933 |
|
934 |
int url_close_buf(AVIOContext *s)
|
935 |
{ |
936 |
put_flush_packet(s); |
937 |
return s->buf_ptr - s->buffer;
|
938 |
} |
939 |
|
940 |
/* output in a dynamic buffer */
|
941 |
|
942 |
typedef struct DynBuffer { |
943 |
int pos, size, allocated_size;
|
944 |
uint8_t *buffer; |
945 |
int io_buffer_size;
|
946 |
uint8_t io_buffer[1];
|
947 |
} DynBuffer; |
948 |
|
949 |
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size) |
950 |
{ |
951 |
DynBuffer *d = opaque; |
952 |
unsigned new_size, new_allocated_size;
|
953 |
|
954 |
/* reallocate buffer if needed */
|
955 |
new_size = d->pos + buf_size; |
956 |
new_allocated_size = d->allocated_size; |
957 |
if(new_size < d->pos || new_size > INT_MAX/2) |
958 |
return -1; |
959 |
while (new_size > new_allocated_size) {
|
960 |
if (!new_allocated_size)
|
961 |
new_allocated_size = new_size; |
962 |
else
|
963 |
new_allocated_size += new_allocated_size / 2 + 1; |
964 |
} |
965 |
|
966 |
if (new_allocated_size > d->allocated_size) {
|
967 |
d->buffer = av_realloc(d->buffer, new_allocated_size); |
968 |
if(d->buffer == NULL) |
969 |
return AVERROR(ENOMEM);
|
970 |
d->allocated_size = new_allocated_size; |
971 |
} |
972 |
memcpy(d->buffer + d->pos, buf, buf_size); |
973 |
d->pos = new_size; |
974 |
if (d->pos > d->size)
|
975 |
d->size = d->pos; |
976 |
return buf_size;
|
977 |
} |
978 |
|
979 |
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size) |
980 |
{ |
981 |
unsigned char buf1[4]; |
982 |
int ret;
|
983 |
|
984 |
/* packetized write: output the header */
|
985 |
AV_WB32(buf1, buf_size); |
986 |
ret= dyn_buf_write(opaque, buf1, 4);
|
987 |
if(ret < 0) |
988 |
return ret;
|
989 |
|
990 |
/* then the data */
|
991 |
return dyn_buf_write(opaque, buf, buf_size);
|
992 |
} |
993 |
|
994 |
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence) |
995 |
{ |
996 |
DynBuffer *d = opaque; |
997 |
|
998 |
if (whence == SEEK_CUR)
|
999 |
offset += d->pos; |
1000 |
else if (whence == SEEK_END) |
1001 |
offset += d->size; |
1002 |
if (offset < 0 || offset > 0x7fffffffLL) |
1003 |
return -1; |
1004 |
d->pos = offset; |
1005 |
return 0; |
1006 |
} |
1007 |
|
1008 |
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size) |
1009 |
{ |
1010 |
DynBuffer *d; |
1011 |
int ret;
|
1012 |
unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024; |
1013 |
|
1014 |
if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size) |
1015 |
return -1; |
1016 |
d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
|
1017 |
if (!d)
|
1018 |
return AVERROR(ENOMEM);
|
1019 |
*s = av_mallocz(sizeof(AVIOContext));
|
1020 |
if(!*s) {
|
1021 |
av_free(d); |
1022 |
return AVERROR(ENOMEM);
|
1023 |
} |
1024 |
d->io_buffer_size = io_buffer_size; |
1025 |
ret = ffio_init_context(*s, d->io_buffer, io_buffer_size, |
1026 |
1, d, NULL, |
1027 |
max_packet_size ? dyn_packet_buf_write : dyn_buf_write, |
1028 |
max_packet_size ? NULL : dyn_buf_seek);
|
1029 |
if (ret == 0) { |
1030 |
(*s)->max_packet_size = max_packet_size; |
1031 |
} else {
|
1032 |
av_free(d); |
1033 |
av_freep(s); |
1034 |
} |
1035 |
return ret;
|
1036 |
} |
1037 |
|
1038 |
int url_open_dyn_buf(AVIOContext **s)
|
1039 |
{ |
1040 |
return url_open_dyn_buf_internal(s, 0); |
1041 |
} |
1042 |
|
1043 |
int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size) |
1044 |
{ |
1045 |
if (max_packet_size <= 0) |
1046 |
return -1; |
1047 |
return url_open_dyn_buf_internal(s, max_packet_size);
|
1048 |
} |
1049 |
|
1050 |
int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
|
1051 |
{ |
1052 |
DynBuffer *d = s->opaque; |
1053 |
int size;
|
1054 |
static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0}; |
1055 |
int padding = 0; |
1056 |
|
1057 |
/* don't attempt to pad fixed-size packet buffers */
|
1058 |
if (!s->max_packet_size) {
|
1059 |
put_buffer(s, padbuf, sizeof(padbuf));
|
1060 |
padding = FF_INPUT_BUFFER_PADDING_SIZE; |
1061 |
} |
1062 |
|
1063 |
put_flush_packet(s); |
1064 |
|
1065 |
*pbuffer = d->buffer; |
1066 |
size = d->size; |
1067 |
av_free(d); |
1068 |
av_free(s); |
1069 |
return size - padding;
|
1070 |
} |
1071 |
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */ |