mirror of https://git.videolan.org/git/ffmpeg.git
suppressed mpeg demux mess - use now dynamic stream creation api
Originally committed as revision 546 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
b9a281db69
commit
db7f1f95ac
401
libav/mpeg.c
401
libav/mpeg.c
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@ -1,6 +1,6 @@
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/*
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* Output a MPEG1 multiplexed video/audio stream
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* Copyright (c) 2000 Gerard Lantau.
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* MPEG1 mux/demux
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* Copyright (c) 2000, 2001, 2002 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -62,8 +62,6 @@ typedef struct {
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#define AUDIO_ID 0xc0
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#define VIDEO_ID 0xe0
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static int mpeg_mux_check_packet(AVFormatContext *s, int *size);
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static int put_pack_header(AVFormatContext *ctx,
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UINT8 *buf, INT64 timestamp)
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{
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@ -150,15 +148,11 @@ static int put_system_header(AVFormatContext *ctx, UINT8 *buf)
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static int mpeg_mux_init(AVFormatContext *ctx)
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{
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MpegMuxContext *s;
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MpegMuxContext *s = ctx->priv_data;
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int bitrate, i, mpa_id, mpv_id, ac3_id;
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AVStream *st;
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StreamInfo *stream;
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s = av_mallocz(sizeof(MpegMuxContext));
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if (!s)
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return -1;
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ctx->priv_data = s;
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s->packet_number = 0;
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/* XXX: hardcoded */
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@ -252,7 +246,6 @@ static int mpeg_mux_init(AVFormatContext *ctx)
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for(i=0;i<ctx->nb_streams;i++) {
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av_free(ctx->streams[i]->priv_data);
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}
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av_free(s);
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return -ENOMEM;
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}
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@ -409,9 +402,37 @@ static int mpeg_mux_end(AVFormatContext *ctx)
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#define MAX_SYNC_SIZE 100000
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static int mpegps_probe(AVProbeData *p)
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{
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int code, c, i;
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code = 0xff;
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/* we search the first start code. If it is a packet start code,
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then we decide it is mpeg ps. We do not send highest value to
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give a chance to mpegts */
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for(i=0;i<p->buf_size;i++) {
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c = p->buf[i];
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code = (code << 8) | c;
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if ((code & 0xffffff00) == 0x100) {
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if (code == PACK_START_CODE ||
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code == SYSTEM_HEADER_START_CODE ||
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(code >= 0x1e0 && code <= 0x1ef) ||
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(code >= 0x1c0 && code <= 0x1df) ||
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code == PRIVATE_STREAM_2 ||
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code == PROGRAM_STREAM_MAP ||
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code == PRIVATE_STREAM_1 ||
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code == PADDING_STREAM)
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return AVPROBE_SCORE_MAX - 1;
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else
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return 0;
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}
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}
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return 0;
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}
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typedef struct MpegDemuxContext {
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int header_state;
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int mux_rate; /* 50 byte/s unit */
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} MpegDemuxContext;
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static int find_start_code(ByteIOContext *pb, int *size_ptr,
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@ -441,188 +462,12 @@ static int find_start_code(ByteIOContext *pb, int *size_ptr,
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return val;
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}
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static int check_stream_id(AVFormatContext *s, int c_id)
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static int mpegps_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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int i;
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for(i = 0;i < s->nb_streams;i++) {
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st = s->streams[i];
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if (st && st->id == c_id)
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return 1;
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}
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return 0;
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}
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static int mpeg_mux_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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MpegDemuxContext *m;
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int size, startcode, c, rate_bound, audio_bound, video_bound, mux_rate, val;
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int codec_id, n, i, type, seems_dvd;
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AVStream *st;
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offset_t start_pos;
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m = av_mallocz(sizeof(MpegDemuxContext));
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if (!m)
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return -ENOMEM;
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s->priv_data = m;
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seems_dvd = 0;
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/* search first pack header */
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MpegDemuxContext *m = s->priv_data;
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m->header_state = 0xff;
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size = MAX_SYNC_SIZE;
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start_pos = url_ftell(&s->pb); /* remember this pos */
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for(;;) {
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/*while (size > 0) {
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startcode = find_start_code(&s->pb, &size, &m->header_state);
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if (startcode == PACK_START_CODE)
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goto found;
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}*/
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/* System Header not found find streams searching through file */
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//fprintf(stderr,"libav: MPEG-PS System Header not found!\n");
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url_fseek(&s->pb, start_pos, SEEK_SET);
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video_bound = 0;
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audio_bound = 0;
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c = 0;
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s->nb_streams = 0;
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//size = 15*MAX_SYNC_SIZE;
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while (size > 0) {
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type = 0;
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codec_id = 0;
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n = 0;
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startcode = find_start_code(&s->pb, &size, &m->header_state);
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//fprintf(stderr,"\nstartcode: %x pos=0x%Lx\n", startcode, url_ftell(&s->pb));
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if (startcode == 0x1bd) {
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url_fseek(&s->pb, -4, SEEK_CUR);
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size += 4;
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startcode = mpeg_mux_check_packet(s, &size);
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//fprintf(stderr,"\nstartcode: %x pos=0x%Lx\n", startcode, url_ftell(&s->pb));
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if (startcode >= 0x80 && startcode <= 0x9f && !check_stream_id(s, startcode)) {
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//fprintf(stderr,"Found AC3 stream ID: 0x%x\n", startcode);
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type = CODEC_TYPE_AUDIO;
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codec_id = CODEC_ID_AC3;
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audio_bound++;
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n = 1;
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c = startcode;
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seems_dvd = 1;
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}
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} else if (startcode == 0x1e0 && !check_stream_id(s, startcode)) {
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//fprintf(stderr,"Found MPEGVIDEO stream ID: 0x%x\n", startcode);
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type = CODEC_TYPE_VIDEO;
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codec_id = CODEC_ID_MPEG1VIDEO;
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n = 1;
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c = startcode;
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video_bound++;
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} else if (startcode >= 0x1c0 && startcode <= 0x1df && !seems_dvd && !check_stream_id(s, startcode)) {
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//fprintf(stderr,"Found MPEGAUDIO stream ID: 0x%x\n", startcode);
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type = CODEC_TYPE_AUDIO;
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codec_id = CODEC_ID_MP2;
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n = 1;
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c = startcode;
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audio_bound++;
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}
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for(i=0;i<n;i++) {
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st = av_mallocz(sizeof(AVStream));
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if (!st)
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return -ENOMEM;
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s->streams[s->nb_streams++] = st;
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st->id = c;
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st->codec.codec_type = type;
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st->codec.codec_id = codec_id;
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}
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}
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if (video_bound || audio_bound) {
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url_fseek(&s->pb, start_pos, SEEK_SET);
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return 0;
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} else
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return -ENODATA;
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found:
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/* search system header just after pack header */
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/* parse pack header */
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get_byte(&s->pb); /* ts1 */
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get_be16(&s->pb); /* ts2 */
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get_be16(&s->pb); /* ts3 */
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mux_rate = get_byte(&s->pb) << 16;
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mux_rate |= get_byte(&s->pb) << 8;
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mux_rate |= get_byte(&s->pb);
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mux_rate &= (1 << 22) - 1;
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m->mux_rate = mux_rate;
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startcode = find_start_code(&s->pb, &size, &m->header_state);
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if (startcode == SYSTEM_HEADER_START_CODE)
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break;
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}
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size = get_be16(&s->pb);
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rate_bound = get_byte(&s->pb) << 16;
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rate_bound |= get_byte(&s->pb) << 8;
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rate_bound |= get_byte(&s->pb);
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rate_bound = (rate_bound >> 1) & ((1 << 22) - 1);
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audio_bound = get_byte(&s->pb) >> 2;
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video_bound = get_byte(&s->pb) & 0x1f;
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get_byte(&s->pb); /* reserved byte */
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#if 0
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printf("mux_rate=%d kbit/s\n", (m->mux_rate * 50 * 8) / 1000);
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printf("rate_bound=%d\n", rate_bound);
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printf("audio_bound=%d\n", audio_bound);
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printf("video_bound=%d\n", video_bound);
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#endif
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size -= 6;
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s->nb_streams = 0;
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while (size > 0) {
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c = get_byte(&s->pb);
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size--;
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if ((c & 0x80) == 0)
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break;
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val = get_be16(&s->pb);
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size -= 2;
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if (c >= 0xc0 && c <= 0xdf) {
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/* mpeg audio stream */
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type = CODEC_TYPE_AUDIO;
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codec_id = CODEC_ID_MP2;
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n = 1;
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c = c | 0x100;
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} else if (c >= 0xe0 && c <= 0xef) {
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type = CODEC_TYPE_VIDEO;
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codec_id = CODEC_ID_MPEG1VIDEO;
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n = 1;
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c = c | 0x100;
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} else if (c == 0xb8) {
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/* all audio streams */
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/* XXX: hack for DVD: we force AC3, although we do not
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know that this codec will be used */
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type = CODEC_TYPE_AUDIO;
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codec_id = CODEC_ID_AC3;
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/* XXX: Another hack for DVD: it seems, that AC3 streams
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aren't signaled on audio_bound on some DVDs (Matrix) */
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if (audio_bound == 0)
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audio_bound++;
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n = audio_bound;
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c = 0x80;
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//c = 0x1c0;
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} else if (c == 0xb9) {
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/* all video streams */
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type = CODEC_TYPE_VIDEO;
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codec_id = CODEC_ID_MPEG1VIDEO;
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n = video_bound;
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c = 0x1e0;
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} else {
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type = 0;
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codec_id = 0;
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n = 0;
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}
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for(i=0;i<n;i++) {
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st = av_mallocz(sizeof(AVStream));
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if (!st)
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return -ENOMEM;
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s->streams[s->nb_streams++] = st;
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st->id = c + i;
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st->codec.codec_type = type;
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st->codec.codec_id = codec_id;
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}
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}
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/* no need to do more */
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return 0;
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}
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@ -641,12 +486,12 @@ static INT64 get_pts(ByteIOContext *pb, int c)
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return pts;
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}
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static int mpeg_mux_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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static int mpegps_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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MpegDemuxContext *m = s->priv_data;
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AVStream *st;
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int len, size, startcode, i, c, flags, header_len;
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int len, size, startcode, i, c, flags, header_len, type, codec_id;
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INT64 pts, dts;
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/* next start code (should be immediately after */
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@ -745,149 +590,69 @@ static int mpeg_mux_read_packet(AVFormatContext *s,
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if (st->id == startcode)
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goto found;
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}
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/* skip packet */
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url_fskip(&s->pb, len);
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goto redo;
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/* no stream found: add a new stream */
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st = av_new_stream(s, startcode);
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if (!st)
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goto skip;
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if (startcode >= 0x1e0 && startcode <= 0x1ef) {
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type = CODEC_TYPE_VIDEO;
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codec_id = CODEC_ID_MPEG1VIDEO;
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} else if (startcode >= 0x1c0 && startcode <= 0x1df) {
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type = CODEC_TYPE_AUDIO;
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codec_id = CODEC_ID_MP2;
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} else if (startcode >= 0x80 && startcode <= 0x9f) {
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type = CODEC_TYPE_AUDIO;
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codec_id = CODEC_ID_AC3;
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} else {
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skip:
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/* skip packet */
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url_fskip(&s->pb, len);
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goto redo;
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}
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st->codec.codec_type = type;
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st->codec.codec_id = codec_id;
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found:
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av_new_packet(pkt, len);
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//printf("\nRead Packet ID: %x PTS: %f Size: %d", startcode,
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// (float)pts/90000, len);
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get_buffer(&s->pb, pkt->data, pkt->size);
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pkt->pts = pts;
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pkt->stream_index = i;
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pkt->stream_index = st->index;
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return 0;
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}
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static int mpeg_mux_check_packet(AVFormatContext *s, int *size)
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static int mpegps_read_close(AVFormatContext *s)
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{
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MpegDemuxContext *m = s->priv_data;
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int len, startcode, c, n, flags, header_len;
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INT64 pts, dts;
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/* next start code (should be immediately after */
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redo:
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m->header_state = 0xff;
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startcode = find_start_code(&s->pb, size, &m->header_state);
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if (startcode < 0)
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return -EIO;
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if (startcode == PACK_START_CODE)
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goto redo;
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if (startcode == SYSTEM_HEADER_START_CODE)
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goto redo;
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if (startcode == PADDING_STREAM ||
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startcode == PRIVATE_STREAM_2) {
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/* skip them */
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len = get_be16(&s->pb);
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url_fskip(&s->pb, len);
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goto redo;
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}
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/* find matching stream */
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if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
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(startcode >= 0x1e0 && startcode <= 0x1ef) ||
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(startcode == 0x1bd)))
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goto redo;
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n = *size;
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len = get_be16(&s->pb);
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n -= 2;
|
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pts = 0;
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dts = 0;
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/* stuffing */
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for(;;) {
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c = get_byte(&s->pb);
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len--;
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n--;
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/* XXX: for mpeg1, should test only bit 7 */
|
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if (c != 0xff)
|
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break;
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}
|
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if ((c & 0xc0) == 0x40) {
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/* buffer scale & size */
|
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get_byte(&s->pb);
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c = get_byte(&s->pb);
|
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len -= 2;
|
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n -= 2;
|
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}
|
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if ((c & 0xf0) == 0x20) {
|
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pts = get_pts(&s->pb, c);
|
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len -= 4;
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n -= 4;
|
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dts = pts;
|
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} else if ((c & 0xf0) == 0x30) {
|
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pts = get_pts(&s->pb, c);
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dts = get_pts(&s->pb, -1);
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len -= 9;
|
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n -= 9;
|
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} else if ((c & 0xc0) == 0x80) {
|
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/* mpeg 2 PES */
|
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if ((c & 0x30) != 0) {
|
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fprintf(stderr, "Encrypted multiplex not handled\n");
|
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return -EIO;
|
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}
|
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flags = get_byte(&s->pb);
|
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header_len = get_byte(&s->pb);
|
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len -= 2;
|
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n -= 2;
|
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if (header_len > len)
|
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goto redo;
|
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if ((flags & 0xc0) == 0x40) {
|
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pts = get_pts(&s->pb, -1);
|
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dts = pts;
|
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header_len -= 5;
|
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len -= 5;
|
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n -= 5;
|
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} if ((flags & 0xc0) == 0xc0) {
|
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pts = get_pts(&s->pb, -1);
|
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dts = get_pts(&s->pb, -1);
|
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header_len -= 10;
|
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len -= 10;
|
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n -= 10;
|
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}
|
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len -= header_len;
|
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n -= header_len;
|
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while (header_len > 0) {
|
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get_byte(&s->pb);
|
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header_len--;
|
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}
|
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}
|
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if (startcode == 0x1bd) {
|
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startcode = get_byte(&s->pb);
|
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len--;
|
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n--;
|
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if (startcode >= 0x80 && startcode <= 0xbf) {
|
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/* audio: skip header */
|
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get_byte(&s->pb);
|
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get_byte(&s->pb);
|
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get_byte(&s->pb);
|
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len -= 3;
|
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n -= 3;
|
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}
|
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}
|
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*size = n;
|
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return startcode;
|
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}
|
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|
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|
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static int mpeg_mux_read_close(AVFormatContext *s)
|
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{
|
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MpegDemuxContext *m = s->priv_data;
|
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av_free(m);
|
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return 0;
|
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}
|
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|
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AVFormat mpeg_mux_format = {
|
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static AVOutputFormat mpegps_mux = {
|
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"mpeg",
|
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"MPEG multiplex format",
|
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"MPEG PS format",
|
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"video/x-mpeg",
|
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"mpg,mpeg,vob",
|
||||
sizeof(MpegMuxContext),
|
||||
CODEC_ID_MP2,
|
||||
CODEC_ID_MPEG1VIDEO,
|
||||
mpeg_mux_init,
|
||||
mpeg_mux_write_packet,
|
||||
mpeg_mux_end,
|
||||
|
||||
mpeg_mux_read_header,
|
||||
mpeg_mux_read_packet,
|
||||
mpeg_mux_read_close,
|
||||
};
|
||||
|
||||
static AVInputFormat mpegps_demux = {
|
||||
"mpeg",
|
||||
"MPEG PS format",
|
||||
sizeof(MpegDemuxContext),
|
||||
mpegps_probe,
|
||||
mpegps_read_header,
|
||||
mpegps_read_packet,
|
||||
mpegps_read_close,
|
||||
flags: AVFMT_NOHEADER,
|
||||
};
|
||||
|
||||
int mpegps_init(void)
|
||||
{
|
||||
av_register_output_format(&mpegps_mux);
|
||||
av_register_input_format(&mpegps_demux);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue