ffmpeg / libavformat / avidec.c @ 5509bffa
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/*
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* AVI decoder.
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* Copyright (c) 2001 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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#include "avi.h" |
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#include "dv.h" |
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#undef NDEBUG
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#include <assert.h> |
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//#define DEBUG
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//#define DEBUG_SEEK
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typedef struct AVIStream { |
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int64_t frame_offset; /* current frame (video) or byte (audio) counter
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(used to compute the pts) */
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int remaining;
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int packet_size;
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int scale;
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int rate;
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int sample_size; /* audio only data */ |
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int start;
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int cum_len; /* temporary storage (used during seek) */ |
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int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b' |
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int prefix_count;
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} AVIStream; |
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typedef struct { |
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int64_t riff_end; |
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int64_t movi_end; |
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offset_t movi_list; |
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int index_loaded;
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int is_odml;
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int non_interleaved;
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int stream_index;
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DVDemuxContext* dv_demux; |
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} AVIContext; |
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static int avi_load_index(AVFormatContext *s); |
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#ifdef DEBUG
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static void print_tag(const char *str, unsigned int tag, int size) |
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{ |
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printf("%s: tag=%c%c%c%c size=0x%x\n",
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str, tag & 0xff,
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(tag >> 8) & 0xff, |
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(tag >> 16) & 0xff, |
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(tag >> 24) & 0xff, |
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size); |
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} |
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#endif
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static int get_riff(AVIContext *avi, ByteIOContext *pb) |
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{ |
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uint32_t tag; |
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/* check RIFF header */
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tag = get_le32(pb); |
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if (tag != MKTAG('R', 'I', 'F', 'F')) |
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return -1; |
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avi->riff_end = get_le32(pb); /* RIFF chunk size */
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avi->riff_end += url_ftell(pb); /* RIFF chunk end */
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tag = get_le32(pb); |
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if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X')) |
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return -1; |
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return 0; |
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} |
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static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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AVIContext *avi = s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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uint32_t tag, tag1, handler; |
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int codec_type, stream_index, frame_period, bit_rate;
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unsigned int size, nb_frames; |
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int i, n;
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AVStream *st; |
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AVIStream *ast; |
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int xan_video = 0; /* hack to support Xan A/V */ |
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avi->stream_index= -1;
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if (get_riff(avi, pb) < 0) |
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return -1; |
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/* first list tag */
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stream_index = -1;
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codec_type = -1;
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frame_period = 0;
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for(;;) {
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if (url_feof(pb))
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goto fail;
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tag = get_le32(pb); |
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size = get_le32(pb); |
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#ifdef DEBUG
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print_tag("tag", tag, size);
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#endif
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switch(tag) {
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case MKTAG('L', 'I', 'S', 'T'): |
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/* ignored, except when start of video packets */
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tag1 = get_le32(pb); |
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#ifdef DEBUG
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print_tag("list", tag1, 0); |
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#endif
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if (tag1 == MKTAG('m', 'o', 'v', 'i')) { |
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avi->movi_list = url_ftell(pb) - 4;
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if(size) avi->movi_end = avi->movi_list + size;
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else avi->movi_end = url_fsize(pb);
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#ifdef DEBUG
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printf("movi end=%Lx\n", avi->movi_end);
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#endif
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goto end_of_header;
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} |
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break;
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case MKTAG('d', 'm', 'l', 'h'): |
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avi->is_odml = 1;
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url_fskip(pb, size + (size & 1));
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break;
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case MKTAG('a', 'v', 'i', 'h'): |
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/* avi header */
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/* using frame_period is bad idea */
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frame_period = get_le32(pb); |
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bit_rate = get_le32(pb) * 8;
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url_fskip(pb, 4 * 4); |
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n = get_le32(pb); |
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for(i=0;i<n;i++) { |
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AVIStream *ast; |
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st = av_new_stream(s, i); |
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if (!st)
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goto fail;
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ast = av_mallocz(sizeof(AVIStream));
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if (!ast)
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goto fail;
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st->priv_data = ast; |
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} |
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url_fskip(pb, size - 7 * 4); |
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break;
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case MKTAG('s', 't', 'r', 'h'): |
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/* stream header */
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stream_index++; |
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tag1 = get_le32(pb); |
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handler = get_le32(pb); /* codec tag */
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#ifdef DEBUG
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print_tag("strh", tag1, -1); |
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#endif
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if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){ |
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/*
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* After some consideration -- I don't think we
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* have to support anything but DV in a type1 AVIs.
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*/
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if (s->nb_streams != 1) |
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goto fail;
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if (handler != MKTAG('d', 'v', 's', 'd') && |
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handler != MKTAG('d', 'v', 'h', 'd') && |
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handler != MKTAG('d', 'v', 's', 'l')) |
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goto fail;
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ast = s->streams[0]->priv_data;
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av_freep(&s->streams[0]->codec->extradata);
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av_freep(&s->streams[0]);
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s->nb_streams = 0;
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avi->dv_demux = dv_init_demux(s); |
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if (!avi->dv_demux)
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goto fail;
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s->streams[0]->priv_data = ast;
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url_fskip(pb, 3 * 4); |
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ast->scale = get_le32(pb); |
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ast->rate = get_le32(pb); |
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stream_index = s->nb_streams - 1;
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url_fskip(pb, size - 7*4); |
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break;
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} |
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if (stream_index >= s->nb_streams) {
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url_fskip(pb, size - 8);
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break;
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} |
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st = s->streams[stream_index]; |
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ast = st->priv_data; |
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st->codec->stream_codec_tag= handler; |
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get_le32(pb); /* flags */
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get_le16(pb); /* priority */
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get_le16(pb); /* language */
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get_le32(pb); /* initial frame */
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ast->scale = get_le32(pb); |
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ast->rate = get_le32(pb); |
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if(ast->scale && ast->rate){
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}else if(frame_period){ |
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ast->rate = 1000000;
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ast->scale = frame_period; |
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}else{
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ast->rate = 25;
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ast->scale = 1;
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} |
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av_set_pts_info(st, 64, ast->scale, ast->rate);
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ast->start= get_le32(pb); /* start */
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nb_frames = get_le32(pb); |
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st->start_time = 0;
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st->duration = nb_frames; |
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get_le32(pb); /* buffer size */
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get_le32(pb); /* quality */
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ast->sample_size = get_le32(pb); /* sample ssize */
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// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
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switch(tag1) {
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case MKTAG('v', 'i', 'd', 's'): |
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codec_type = CODEC_TYPE_VIDEO; |
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ast->sample_size = 0;
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break;
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case MKTAG('a', 'u', 'd', 's'): |
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codec_type = CODEC_TYPE_AUDIO; |
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break;
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case MKTAG('t', 'x', 't', 's'): |
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//FIXME
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codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
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break;
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case MKTAG('p', 'a', 'd', 's'): |
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codec_type = CODEC_TYPE_UNKNOWN; |
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stream_index--; |
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break;
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default:
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av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
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goto fail;
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} |
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url_fskip(pb, size - 12 * 4); |
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break;
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case MKTAG('s', 't', 'r', 'f'): |
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/* stream header */
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if (stream_index >= s->nb_streams || avi->dv_demux) {
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url_fskip(pb, size); |
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} else {
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st = s->streams[stream_index]; |
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switch(codec_type) {
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case CODEC_TYPE_VIDEO:
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get_le32(pb); /* size */
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st->codec->width = get_le32(pb); |
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st->codec->height = get_le32(pb); |
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get_le16(pb); /* panes */
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st->codec->bits_per_sample= get_le16(pb); /* depth */
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tag1 = get_le32(pb); |
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get_le32(pb); /* ImageSize */
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get_le32(pb); /* XPelsPerMeter */
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get_le32(pb); /* YPelsPerMeter */
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get_le32(pb); /* ClrUsed */
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get_le32(pb); /* ClrImportant */
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if(size > 10*4 && size<(1<<30)){ |
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st->codec->extradata_size= size - 10*4; |
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st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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get_buffer(pb, st->codec->extradata, st->codec->extradata_size); |
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} |
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if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly |
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get_byte(pb); |
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/* Extract palette from extradata if bpp <= 8 */
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/* This code assumes that extradata contains only palette */
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/* This is true for all paletted codecs implemented in ffmpeg */
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if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) { |
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st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
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#ifdef WORDS_BIGENDIAN
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for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++) |
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st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]); |
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#else
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memcpy(st->codec->palctrl->palette, st->codec->extradata, |
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FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)); |
293 |
#endif
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st->codec->palctrl->palette_changed = 1;
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} |
296 |
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#ifdef DEBUG
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print_tag("video", tag1, 0); |
299 |
#endif
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st->codec->codec_type = CODEC_TYPE_VIDEO; |
301 |
st->codec->codec_tag = tag1; |
302 |
st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1); |
303 |
if (st->codec->codec_id == CODEC_ID_XAN_WC4)
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xan_video = 1;
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st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts |
306 |
// url_fskip(pb, size - 5 * 4);
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break;
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case CODEC_TYPE_AUDIO:
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get_wav_header(pb, st->codec, size); |
310 |
if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ |
311 |
url_fskip(pb, 1);
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/* special case time: To support Xan DPCM, hardcode
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* the format if Xxan is the video codec */
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st->need_parsing = 1;
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/* force parsing as several audio frames can be in
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one packet */
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317 |
if (xan_video)
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st->codec->codec_id = CODEC_ID_XAN_DPCM; |
319 |
break;
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320 |
default:
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321 |
st->codec->codec_type = CODEC_TYPE_DATA; |
322 |
st->codec->codec_id= CODEC_ID_NONE; |
323 |
st->codec->codec_tag= 0;
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324 |
url_fskip(pb, size); |
325 |
break;
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326 |
} |
327 |
} |
328 |
break;
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329 |
default:
|
330 |
/* skip tag */
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331 |
size += (size & 1);
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332 |
url_fskip(pb, size); |
333 |
break;
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} |
335 |
} |
336 |
end_of_header:
|
337 |
/* check stream number */
|
338 |
if (stream_index != s->nb_streams - 1) { |
339 |
fail:
|
340 |
for(i=0;i<s->nb_streams;i++) { |
341 |
av_freep(&s->streams[i]->codec->extradata); |
342 |
av_freep(&s->streams[i]); |
343 |
} |
344 |
return -1; |
345 |
} |
346 |
|
347 |
assert(!avi->index_loaded); |
348 |
avi_load_index(s); |
349 |
avi->index_loaded = 1;
|
350 |
|
351 |
return 0; |
352 |
} |
353 |
|
354 |
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) |
355 |
{ |
356 |
AVIContext *avi = s->priv_data; |
357 |
ByteIOContext *pb = &s->pb; |
358 |
int n, d[8], size; |
359 |
offset_t i, sync; |
360 |
void* dstr;
|
361 |
|
362 |
if (avi->dv_demux) {
|
363 |
size = dv_get_packet(avi->dv_demux, pkt); |
364 |
if (size >= 0) |
365 |
return size;
|
366 |
} |
367 |
|
368 |
if(avi->non_interleaved){
|
369 |
int best_stream_index = 0; |
370 |
AVStream *best_st= NULL;
|
371 |
AVIStream *best_ast; |
372 |
int64_t best_ts= INT64_MAX; |
373 |
int i;
|
374 |
|
375 |
for(i=0; i<s->nb_streams; i++){ |
376 |
AVStream *st = s->streams[i]; |
377 |
AVIStream *ast = st->priv_data; |
378 |
int64_t ts= ast->frame_offset; |
379 |
|
380 |
if(ast->sample_size)
|
381 |
ts /= ast->sample_size; |
382 |
ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den); |
383 |
|
384 |
// av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
|
385 |
if(ts < best_ts){
|
386 |
best_ts= ts; |
387 |
best_st= st; |
388 |
best_stream_index= i; |
389 |
} |
390 |
} |
391 |
best_ast = best_st->priv_data; |
392 |
best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
|
393 |
if(best_ast->remaining)
|
394 |
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); |
395 |
else
|
396 |
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); |
397 |
|
398 |
// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
|
399 |
if(i>=0){ |
400 |
int64_t pos= best_st->index_entries[i].pos; |
401 |
pos += avi->movi_list + best_ast->packet_size - best_ast->remaining; |
402 |
url_fseek(&s->pb, pos, SEEK_SET); |
403 |
// av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
|
404 |
|
405 |
if(best_ast->remaining)
|
406 |
avi->stream_index= best_stream_index; |
407 |
else
|
408 |
avi->stream_index= -1;
|
409 |
} |
410 |
} |
411 |
|
412 |
resync:
|
413 |
if(avi->stream_index >= 0){ |
414 |
AVStream *st= s->streams[ avi->stream_index ]; |
415 |
AVIStream *ast= st->priv_data; |
416 |
int size;
|
417 |
|
418 |
if(ast->sample_size == 0) |
419 |
size= INT_MAX; |
420 |
else if(ast->sample_size < 32) |
421 |
size= 64*ast->sample_size;
|
422 |
else
|
423 |
size= ast->sample_size; |
424 |
|
425 |
if(size > ast->remaining)
|
426 |
size= ast->remaining; |
427 |
av_get_packet(pb, pkt, size); |
428 |
|
429 |
if (avi->dv_demux) {
|
430 |
dstr = pkt->destruct; |
431 |
size = dv_produce_packet(avi->dv_demux, pkt, |
432 |
pkt->data, pkt->size); |
433 |
pkt->destruct = dstr; |
434 |
pkt->flags |= PKT_FLAG_KEY; |
435 |
} else {
|
436 |
/* XXX: how to handle B frames in avi ? */
|
437 |
pkt->dts = ast->frame_offset; |
438 |
// pkt->dts += ast->start;
|
439 |
if(ast->sample_size)
|
440 |
pkt->dts /= ast->sample_size; |
441 |
//av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%d %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, n, size);
|
442 |
pkt->stream_index = avi->stream_index; |
443 |
|
444 |
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
445 |
if(st->index_entries){
|
446 |
AVIndexEntry *e; |
447 |
int index;
|
448 |
|
449 |
index= av_index_search_timestamp(st, pkt->dts, 0);
|
450 |
e= &st->index_entries[index]; |
451 |
|
452 |
if(index >= 0 && e->timestamp == ast->frame_offset){ |
453 |
if (e->flags & AVINDEX_KEYFRAME)
|
454 |
pkt->flags |= PKT_FLAG_KEY; |
455 |
} |
456 |
} else {
|
457 |
/* if no index, better to say that all frames
|
458 |
are key frames */
|
459 |
pkt->flags |= PKT_FLAG_KEY; |
460 |
} |
461 |
} else {
|
462 |
pkt->flags |= PKT_FLAG_KEY; |
463 |
} |
464 |
if(ast->sample_size)
|
465 |
ast->frame_offset += pkt->size; |
466 |
else
|
467 |
ast->frame_offset++; |
468 |
} |
469 |
ast->remaining -= size; |
470 |
if(!ast->remaining){
|
471 |
avi->stream_index= -1;
|
472 |
ast->packet_size= 0;
|
473 |
if (size & 1) { |
474 |
get_byte(pb); |
475 |
size++; |
476 |
} |
477 |
} |
478 |
|
479 |
return size;
|
480 |
} |
481 |
|
482 |
memset(d, -1, sizeof(int)*8); |
483 |
for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
|
484 |
int j;
|
485 |
|
486 |
if (i >= avi->movi_end) {
|
487 |
if (avi->is_odml) {
|
488 |
url_fskip(pb, avi->riff_end - i); |
489 |
avi->riff_end = avi->movi_end = url_fsize(pb); |
490 |
} else
|
491 |
break;
|
492 |
} |
493 |
|
494 |
for(j=0; j<7; j++) |
495 |
d[j]= d[j+1];
|
496 |
d[7]= get_byte(pb);
|
497 |
|
498 |
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); |
499 |
|
500 |
if( d[2] >= '0' && d[2] <= '9' |
501 |
&& d[3] >= '0' && d[3] <= '9'){ |
502 |
n= (d[2] - '0') * 10 + (d[3] - '0'); |
503 |
}else{
|
504 |
n= 100; //invalid stream id |
505 |
} |
506 |
//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
|
507 |
if(i + size > avi->movi_end || d[0]<0) |
508 |
continue;
|
509 |
|
510 |
//parse ix##
|
511 |
if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) |
512 |
//parse JUNK
|
513 |
||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){ |
514 |
url_fskip(pb, size); |
515 |
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
|
516 |
goto resync;
|
517 |
} |
518 |
|
519 |
if( d[0] >= '0' && d[0] <= '9' |
520 |
&& d[1] >= '0' && d[1] <= '9'){ |
521 |
n= (d[0] - '0') * 10 + (d[1] - '0'); |
522 |
}else{
|
523 |
n= 100; //invalid stream id |
524 |
} |
525 |
|
526 |
//parse ##dc/##wb
|
527 |
if(n < s->nb_streams){
|
528 |
AVStream *st; |
529 |
AVIStream *ast; |
530 |
st = s->streams[n]; |
531 |
ast = st->priv_data; |
532 |
|
533 |
if( (st->discard >= AVDISCARD_DEFAULT && size==0) |
534 |
/*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering |
535 |
|| st->discard >= AVDISCARD_ALL){ |
536 |
if(ast->sample_size) ast->frame_offset += pkt->size;
|
537 |
else ast->frame_offset++;
|
538 |
url_fskip(pb, size); |
539 |
goto resync;
|
540 |
} |
541 |
|
542 |
if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) || |
543 |
d[2]*256+d[3] == ast->prefix /*|| |
544 |
(d[2] == 'd' && d[3] == 'c') ||
|
545 |
(d[2] == 'w' && d[3] == 'b')*/) {
|
546 |
|
547 |
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
|
548 |
if(d[2]*256+d[3] == ast->prefix) |
549 |
ast->prefix_count++; |
550 |
else{
|
551 |
ast->prefix= d[2]*256+d[3]; |
552 |
ast->prefix_count= 0;
|
553 |
} |
554 |
|
555 |
avi->stream_index= n; |
556 |
ast->packet_size= size + 8;
|
557 |
ast->remaining= size; |
558 |
goto resync;
|
559 |
} |
560 |
} |
561 |
/* palette changed chunk */
|
562 |
if ( d[0] >= '0' && d[0] <= '9' |
563 |
&& d[1] >= '0' && d[1] <= '9' |
564 |
&& ((d[2] == 'p' && d[3] == 'c')) |
565 |
&& n < s->nb_streams && i + size <= avi->movi_end) { |
566 |
|
567 |
AVStream *st; |
568 |
int first, clr, flags, k, p;
|
569 |
|
570 |
st = s->streams[n]; |
571 |
|
572 |
first = get_byte(pb); |
573 |
clr = get_byte(pb); |
574 |
if(!clr) /* all 256 colors used */ |
575 |
clr = 256;
|
576 |
flags = get_le16(pb); |
577 |
p = 4;
|
578 |
for (k = first; k < clr + first; k++) {
|
579 |
int r, g, b;
|
580 |
r = get_byte(pb); |
581 |
g = get_byte(pb); |
582 |
b = get_byte(pb); |
583 |
get_byte(pb); |
584 |
st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16); |
585 |
} |
586 |
st->codec->palctrl->palette_changed = 1;
|
587 |
goto resync;
|
588 |
} |
589 |
|
590 |
} |
591 |
|
592 |
return -1; |
593 |
} |
594 |
|
595 |
/* XXX: we make the implicit supposition that the position are sorted
|
596 |
for each stream */
|
597 |
static int avi_read_idx1(AVFormatContext *s, int size) |
598 |
{ |
599 |
AVIContext *avi = s->priv_data; |
600 |
ByteIOContext *pb = &s->pb; |
601 |
int nb_index_entries, i;
|
602 |
AVStream *st; |
603 |
AVIStream *ast; |
604 |
unsigned int index, tag, flags, pos, len; |
605 |
unsigned last_pos= -1; |
606 |
|
607 |
nb_index_entries = size / 16;
|
608 |
if (nb_index_entries <= 0) |
609 |
return -1; |
610 |
|
611 |
/* read the entries and sort them in each stream component */
|
612 |
for(i = 0; i < nb_index_entries; i++) { |
613 |
tag = get_le32(pb); |
614 |
flags = get_le32(pb); |
615 |
pos = get_le32(pb); |
616 |
len = get_le32(pb); |
617 |
#if defined(DEBUG_SEEK)
|
618 |
av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", |
619 |
i, tag, flags, pos, len); |
620 |
#endif
|
621 |
if(i==0 && pos > avi->movi_list) |
622 |
avi->movi_list= 0; //FIXME better check |
623 |
|
624 |
index = ((tag & 0xff) - '0') * 10; |
625 |
index += ((tag >> 8) & 0xff) - '0'; |
626 |
if (index >= s->nb_streams)
|
627 |
continue;
|
628 |
st = s->streams[index]; |
629 |
ast = st->priv_data; |
630 |
|
631 |
#if defined(DEBUG_SEEK)
|
632 |
av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len); |
633 |
#endif
|
634 |
if(last_pos == pos)
|
635 |
avi->non_interleaved= 1;
|
636 |
else
|
637 |
av_add_index_entry(st, pos, ast->cum_len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); |
638 |
if(ast->sample_size)
|
639 |
ast->cum_len += len / ast->sample_size; |
640 |
else
|
641 |
ast->cum_len ++; |
642 |
last_pos= pos; |
643 |
} |
644 |
return 0; |
645 |
} |
646 |
|
647 |
static int guess_ni_flag(AVFormatContext *s){ |
648 |
int i;
|
649 |
int64_t last_start=0;
|
650 |
int64_t first_end= INT64_MAX; |
651 |
|
652 |
for(i=0; i<s->nb_streams; i++){ |
653 |
AVStream *st = s->streams[i]; |
654 |
int n= st->nb_index_entries;
|
655 |
|
656 |
if(n <= 0) |
657 |
continue;
|
658 |
|
659 |
if(st->index_entries[0].pos > last_start) |
660 |
last_start= st->index_entries[0].pos;
|
661 |
if(st->index_entries[n-1].pos < first_end) |
662 |
first_end= st->index_entries[n-1].pos;
|
663 |
} |
664 |
return last_start > first_end;
|
665 |
} |
666 |
|
667 |
static int avi_load_index(AVFormatContext *s) |
668 |
{ |
669 |
AVIContext *avi = s->priv_data; |
670 |
ByteIOContext *pb = &s->pb; |
671 |
uint32_t tag, size; |
672 |
offset_t pos= url_ftell(pb); |
673 |
|
674 |
url_fseek(pb, avi->movi_end, SEEK_SET); |
675 |
#ifdef DEBUG_SEEK
|
676 |
printf("movi_end=0x%llx\n", avi->movi_end);
|
677 |
#endif
|
678 |
for(;;) {
|
679 |
if (url_feof(pb))
|
680 |
break;
|
681 |
tag = get_le32(pb); |
682 |
size = get_le32(pb); |
683 |
#ifdef DEBUG_SEEK
|
684 |
printf("tag=%c%c%c%c size=0x%x\n",
|
685 |
tag & 0xff,
|
686 |
(tag >> 8) & 0xff, |
687 |
(tag >> 16) & 0xff, |
688 |
(tag >> 24) & 0xff, |
689 |
size); |
690 |
#endif
|
691 |
switch(tag) {
|
692 |
case MKTAG('i', 'd', 'x', '1'): |
693 |
if (avi_read_idx1(s, size) < 0) |
694 |
goto skip;
|
695 |
else
|
696 |
goto the_end;
|
697 |
break;
|
698 |
default:
|
699 |
skip:
|
700 |
size += (size & 1);
|
701 |
url_fskip(pb, size); |
702 |
break;
|
703 |
} |
704 |
} |
705 |
the_end:
|
706 |
avi->non_interleaved |= guess_ni_flag(s); |
707 |
url_fseek(pb, pos, SEEK_SET); |
708 |
return 0; |
709 |
} |
710 |
|
711 |
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
712 |
{ |
713 |
AVIContext *avi = s->priv_data; |
714 |
AVStream *st; |
715 |
int i, index;
|
716 |
int64_t pos; |
717 |
|
718 |
if (!avi->index_loaded) {
|
719 |
/* we only load the index on demand */
|
720 |
avi_load_index(s); |
721 |
avi->index_loaded = 1;
|
722 |
} |
723 |
assert(stream_index>= 0);
|
724 |
|
725 |
st = s->streams[stream_index]; |
726 |
index= av_index_search_timestamp(st, timestamp, flags); |
727 |
if(index<0) |
728 |
return -1; |
729 |
|
730 |
/* find the position */
|
731 |
pos = st->index_entries[index].pos; |
732 |
timestamp = st->index_entries[index].timestamp; |
733 |
|
734 |
// av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
|
735 |
|
736 |
for(i = 0; i < s->nb_streams; i++) { |
737 |
AVStream *st2 = s->streams[i]; |
738 |
AVIStream *ast2 = st2->priv_data; |
739 |
|
740 |
ast2->packet_size= |
741 |
ast2->remaining= 0;
|
742 |
|
743 |
if (st2->nb_index_entries <= 0) |
744 |
continue;
|
745 |
|
746 |
// assert(st2->codec.block_align);
|
747 |
assert(st2->time_base.den == ast2->rate); |
748 |
assert(st2->time_base.num == ast2->scale); |
749 |
index = av_index_search_timestamp( |
750 |
st2, |
751 |
av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num), |
752 |
flags | AVSEEK_FLAG_BACKWARD); |
753 |
if(index<0) |
754 |
index=0;
|
755 |
|
756 |
if(!avi->non_interleaved){
|
757 |
while(index>0 && st2->index_entries[index].pos > pos) |
758 |
index--; |
759 |
while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos) |
760 |
index++; |
761 |
} |
762 |
|
763 |
// av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
|
764 |
/* extract the current frame number */
|
765 |
ast2->frame_offset = st2->index_entries[index].timestamp; |
766 |
if(ast2->sample_size)
|
767 |
ast2->frame_offset *=ast2->sample_size; |
768 |
} |
769 |
|
770 |
if (avi->dv_demux)
|
771 |
dv_flush_audio_packets(avi->dv_demux); |
772 |
/* do the seek */
|
773 |
pos += avi->movi_list; |
774 |
url_fseek(&s->pb, pos, SEEK_SET); |
775 |
avi->stream_index= -1;
|
776 |
return 0; |
777 |
} |
778 |
|
779 |
static int avi_read_close(AVFormatContext *s) |
780 |
{ |
781 |
int i;
|
782 |
AVIContext *avi = s->priv_data; |
783 |
|
784 |
for(i=0;i<s->nb_streams;i++) { |
785 |
AVStream *st = s->streams[i]; |
786 |
AVIStream *ast = st->priv_data; |
787 |
av_free(ast); |
788 |
av_free(st->codec->extradata); |
789 |
av_free(st->codec->palctrl); |
790 |
} |
791 |
|
792 |
if (avi->dv_demux)
|
793 |
av_free(avi->dv_demux); |
794 |
|
795 |
return 0; |
796 |
} |
797 |
|
798 |
static int avi_probe(AVProbeData *p) |
799 |
{ |
800 |
/* check file header */
|
801 |
if (p->buf_size <= 32) |
802 |
return 0; |
803 |
if (p->buf[0] == 'R' && p->buf[1] == 'I' && |
804 |
p->buf[2] == 'F' && p->buf[3] == 'F' && |
805 |
p->buf[8] == 'A' && p->buf[9] == 'V' && |
806 |
p->buf[10] == 'I' && p->buf[11] == ' ') |
807 |
return AVPROBE_SCORE_MAX;
|
808 |
else
|
809 |
return 0; |
810 |
} |
811 |
|
812 |
static AVInputFormat avi_iformat = {
|
813 |
"avi",
|
814 |
"avi format",
|
815 |
sizeof(AVIContext),
|
816 |
avi_probe, |
817 |
avi_read_header, |
818 |
avi_read_packet, |
819 |
avi_read_close, |
820 |
avi_read_seek, |
821 |
}; |
822 |
|
823 |
int avidec_init(void) |
824 |
{ |
825 |
av_register_input_format(&avi_iformat); |
826 |
return 0; |
827 |
} |