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Diffstat (limited to 'contrib/ffmpeg/libavformat/mpeg.c')
-rw-r--r--contrib/ffmpeg/libavformat/mpeg.c580
1 files changed, 0 insertions, 580 deletions
diff --git a/contrib/ffmpeg/libavformat/mpeg.c b/contrib/ffmpeg/libavformat/mpeg.c
deleted file mode 100644
index 97b2a637a..000000000
--- a/contrib/ffmpeg/libavformat/mpeg.c
+++ /dev/null
@@ -1,580 +0,0 @@
-/*
- * MPEG1/2 demuxer
- * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "avformat.h"
-#include "mpeg.h"
-
-//#define DEBUG_SEEK
-
-#undef NDEBUG
-#include <assert.h>
-
-/*********************************************/
-/* demux code */
-
-#define MAX_SYNC_SIZE 100000
-
-static int check_pes(uint8_t *p, uint8_t *end){
- int pes1;
- int pes2= (p[3] & 0xC0) == 0x80
- && (p[4] & 0xC0) != 0x40
- &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
-
- for(p+=3; p<end && *p == 0xFF; p++);
- if((*p&0xC0) == 0x40) p+=2;
- if((*p&0xF0) == 0x20){
- pes1= p[0]&p[2]&p[4]&1;
- p+=5;
- }else if((*p&0xF0) == 0x30){
- pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
- p+=10;
- }else
- pes1 = *p == 0x0F;
-
- return pes1||pes2;
-}
-
-static int mpegps_probe(AVProbeData *p)
-{
- uint32_t code= -1;
- int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
- int i;
- int score=0;
-
- for(i=0; i<p->buf_size; i++){
- code = (code<<8) + p->buf[i];
- if ((code & 0xffffff00) == 0x100) {
- int pes= check_pes(p->buf+i, p->buf+p->buf_size);
-
- if(code == SYSTEM_HEADER_START_CODE) sys++;
- else if(code == PRIVATE_STREAM_1) priv1++;
- else if(code == PACK_START_CODE) pspack++;
- else if((code & 0xf0) == VIDEO_ID && pes) vid++;
- else if((code & 0xe0) == AUDIO_ID && pes) audio++;
-
- else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
- else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
- }
- }
-
- if(vid+audio > invalid) /* invalid VDR files nd short PES streams */
- score= AVPROBE_SCORE_MAX/4;
-
-//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, p->buf_size);
- if(sys>invalid && sys*9 <= pspack*10)
- return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
- if(priv1 + vid + audio > invalid && (priv1+vid+audio)*9 <= pspack*10)
- return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
- if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */
- return AVPROBE_SCORE_MAX/2+2;
-
- //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
- return score;
-}
-
-
-typedef struct MpegDemuxContext {
- int32_t header_state;
- unsigned char psm_es_type[256];
- int sofdec;
-} MpegDemuxContext;
-
-static int mpegps_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
-{
- MpegDemuxContext *m = s->priv_data;
- const char *sofdec = "Sofdec";
- int v, i = 0;
-
- m->header_state = 0xff;
- s->ctx_flags |= AVFMTCTX_NOHEADER;
-
- m->sofdec = -1;
- do {
- v = get_byte(s->pb);
- m->header_state = m->header_state << 8 | v;
- m->sofdec++;
- } while (v == sofdec[i] && i++ < 6);
-
- /* no need to do more */
- return 0;
-}
-
-static int64_t get_pts(ByteIOContext *pb, int c)
-{
- uint8_t buf[5];
-
- buf[0] = c<0 ? get_byte(pb) : c;
- get_buffer(pb, buf+1, 4);
-
- return ff_parse_pes_pts(buf);
-}
-
-static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
- int32_t *header_state)
-{
- unsigned int state, v;
- int val, n;
-
- state = *header_state;
- n = *size_ptr;
- while (n > 0) {
- if (url_feof(pb))
- break;
- v = get_byte(pb);
- n--;
- if (state == 0x000001) {
- state = ((state << 8) | v) & 0xffffff;
- val = state;
- goto found;
- }
- state = ((state << 8) | v) & 0xffffff;
- }
- val = -1;
- found:
- *header_state = state;
- *size_ptr = n;
- return val;
-}
-
-#if 0 /* unused, remove? */
-/* XXX: optimize */
-static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
-{
- int64_t pos, pos_start;
- int max_size, start_code;
-
- max_size = *size_ptr;
- pos_start = url_ftell(pb);
-
- /* in order to go faster, we fill the buffer */
- pos = pos_start - 16386;
- if (pos < 0)
- pos = 0;
- url_fseek(pb, pos, SEEK_SET);
- get_byte(pb);
-
- pos = pos_start;
- for(;;) {
- pos--;
- if (pos < 0 || (pos_start - pos) >= max_size) {
- start_code = -1;
- goto the_end;
- }
- url_fseek(pb, pos, SEEK_SET);
- start_code = get_be32(pb);
- if ((start_code & 0xffffff00) == 0x100)
- break;
- }
- the_end:
- *size_ptr = pos_start - pos;
- return start_code;
-}
-#endif
-
-/**
- * Extracts stream types from a program stream map
- * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
- *
- * @return number of bytes occupied by PSM in the bitstream
- */
-static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
-{
- int psm_length, ps_info_length, es_map_length;
-
- psm_length = get_be16(pb);
- get_byte(pb);
- get_byte(pb);
- ps_info_length = get_be16(pb);
-
- /* skip program_stream_info */
- url_fskip(pb, ps_info_length);
- es_map_length = get_be16(pb);
-
- /* at least one es available? */
- while (es_map_length >= 4){
- unsigned char type = get_byte(pb);
- unsigned char es_id = get_byte(pb);
- uint16_t es_info_length = get_be16(pb);
- /* remember mapping from stream id to stream type */
- m->psm_es_type[es_id] = type;
- /* skip program_stream_info */
- url_fskip(pb, es_info_length);
- es_map_length -= 4 + es_info_length;
- }
- get_be32(pb); /* crc32 */
- return 2 + psm_length;
-}
-
-/* read the next PES header. Return its position in ppos
- (if not NULL), and its start code, pts and dts.
- */
-static int mpegps_read_pes_header(AVFormatContext *s,
- int64_t *ppos, int *pstart_code,
- int64_t *ppts, int64_t *pdts)
-{
- MpegDemuxContext *m = s->priv_data;
- int len, size, startcode, c, flags, header_len;
- int pes_ext, ext2_len, id_ext, skip;
- int64_t pts, dts;
- int64_t last_sync= url_ftell(s->pb);
-
- error_redo:
- url_fseek(s->pb, last_sync, SEEK_SET);
- redo:
- /* next start code (should be immediately after) */
- m->header_state = 0xff;
- size = MAX_SYNC_SIZE;
- startcode = find_next_start_code(s->pb, &size, &m->header_state);
- last_sync = url_ftell(s->pb);
- //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(s->pb));
- if (startcode < 0)
- return AVERROR(EIO);
- if (startcode == PACK_START_CODE)
- goto redo;
- if (startcode == SYSTEM_HEADER_START_CODE)
- goto redo;
- if (startcode == PADDING_STREAM) {
- url_fskip(s->pb, get_be16(s->pb));
- goto redo;
- }
- if (startcode == PRIVATE_STREAM_2) {
- len = get_be16(s->pb);
- if (!m->sofdec) {
- while (len-- >= 6) {
- if (get_byte(s->pb) == 'S') {
- uint8_t buf[5];
- get_buffer(s->pb, buf, sizeof(buf));
- m->sofdec = !memcmp(buf, "ofdec", 5);
- len -= sizeof(buf);
- break;
- }
- }
- m->sofdec -= !m->sofdec;
- }
- url_fskip(s->pb, len);
- goto redo;
- }
- if (startcode == PROGRAM_STREAM_MAP) {
- mpegps_psm_parse(m, s->pb);
- goto redo;
- }
-
- /* find matching stream */
- if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
- (startcode >= 0x1e0 && startcode <= 0x1ef) ||
- (startcode == 0x1bd) || (startcode == 0x1fd)))
- goto redo;
- if (ppos) {
- *ppos = url_ftell(s->pb) - 4;
- }
- len = get_be16(s->pb);
- pts =
- dts = AV_NOPTS_VALUE;
- /* stuffing */
- for(;;) {
- if (len < 1)
- goto error_redo;
- c = get_byte(s->pb);
- len--;
- /* XXX: for mpeg1, should test only bit 7 */
- if (c != 0xff)
- break;
- }
- if ((c & 0xc0) == 0x40) {
- /* buffer scale & size */
- get_byte(s->pb);
- c = get_byte(s->pb);
- len -= 2;
- }
- if ((c & 0xe0) == 0x20) {
- dts = pts = get_pts(s->pb, c);
- len -= 4;
- if (c & 0x10){
- dts = get_pts(s->pb, -1);
- len -= 5;
- }
- } else if ((c & 0xc0) == 0x80) {
- /* mpeg 2 PES */
-#if 0 /* some streams have this field set for no apparent reason */
- if ((c & 0x30) != 0) {
- /* Encrypted multiplex not handled */
- goto redo;
- }
-#endif
- flags = get_byte(s->pb);
- header_len = get_byte(s->pb);
- len -= 2;
- if (header_len > len)
- goto error_redo;
- len -= header_len;
- if (flags & 0x80) {
- dts = pts = get_pts(s->pb, -1);
- header_len -= 5;
- if (flags & 0x40) {
- dts = get_pts(s->pb, -1);
- header_len -= 5;
- }
- }
- if (flags & 0x01) { /* PES extension */
- pes_ext = get_byte(s->pb);
- header_len--;
- if (pes_ext & 0x40) { /* pack header - should be zero in PS */
- goto error_redo;
- }
- /* Skip PES private data, program packet sequence counter and P-STD buffer */
- skip = (pes_ext >> 4) & 0xb;
- skip += skip & 0x9;
- url_fskip(s->pb, skip);
- header_len -= skip;
-
- if (pes_ext & 0x01) { /* PES extension 2 */
- ext2_len = get_byte(s->pb);
- header_len--;
- if ((ext2_len & 0x7f) > 0) {
- id_ext = get_byte(s->pb);
- if ((id_ext & 0x80) == 0)
- startcode = ((startcode & 0xff) << 8) | id_ext;
- header_len--;
- }
- }
- }
- if(header_len < 0)
- goto error_redo;
- url_fskip(s->pb, header_len);
- }
- else if( c!= 0xf )
- goto redo;
-
- if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
- startcode = get_byte(s->pb);
- len--;
- if (startcode >= 0x80 && startcode <= 0xcf) {
- /* audio: skip header */
- get_byte(s->pb);
- get_byte(s->pb);
- get_byte(s->pb);
- len -= 3;
- if (startcode >= 0xb0 && startcode <= 0xbf) {
- /* MLP/TrueHD audio has a 4-byte header */
- get_byte(s->pb);
- len--;
- }
- }
- }
- if(len<0)
- goto error_redo;
- if(dts != AV_NOPTS_VALUE && ppos){
- int i;
- for(i=0; i<s->nb_streams; i++){
- if(startcode == s->streams[i]->id &&
- !url_is_streamed(s->pb) /* index useless on streams anyway */) {
- ff_reduce_index(s, i);
- av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
- }
- }
- }
-
- *pstart_code = startcode;
- *ppts = pts;
- *pdts = dts;
- return len;
-}
-
-static int mpegps_read_packet(AVFormatContext *s,
- AVPacket *pkt)
-{
- MpegDemuxContext *m = s->priv_data;
- AVStream *st;
- int len, startcode, i, type, codec_id = 0, es_type;
- int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
-
- redo:
- len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
- if (len < 0)
- return len;
-
- /* now find stream */
- for(i=0;i<s->nb_streams;i++) {
- st = s->streams[i];
- if (st->id == startcode)
- goto found;
- }
-
- es_type = m->psm_es_type[startcode & 0xff];
- if(es_type > 0){
- if(es_type == STREAM_TYPE_VIDEO_MPEG1){
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
- es_type == STREAM_TYPE_AUDIO_MPEG2){
- codec_id = CODEC_ID_MP3;
- type = CODEC_TYPE_AUDIO;
- } else if(es_type == STREAM_TYPE_AUDIO_AAC){
- codec_id = CODEC_ID_AAC;
- type = CODEC_TYPE_AUDIO;
- } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
- codec_id = CODEC_ID_MPEG4;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_VIDEO_H264){
- codec_id = CODEC_ID_H264;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_AUDIO_AC3){
- codec_id = CODEC_ID_AC3;
- type = CODEC_TYPE_AUDIO;
- } else {
- goto skip;
- }
- } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
- static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
- unsigned char buf[8];
- get_buffer(s->pb, buf, 8);
- url_fseek(s->pb, -8, SEEK_CUR);
- if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
- codec_id = CODEC_ID_CAVS;
- else
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
- type = CODEC_TYPE_AUDIO;
- codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
- } else if (startcode >= 0x80 && startcode <= 0x87) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AC3;
- } else if ((startcode >= 0x88 && startcode <= 0x8f)
- ||( startcode >= 0x98 && startcode <= 0x9f)) {
- /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_DTS;
- } else if (startcode >= 0xa0 && startcode <= 0xaf) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_PCM_S16BE;
- } else if (startcode >= 0xb0 && startcode <= 0xbf) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_MLP;
- } else if (startcode >= 0xc0 && startcode <= 0xcf) {
- /* Used for both AC-3 and E-AC-3 in EVOB files */
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AC3;
- } else if (startcode >= 0x20 && startcode <= 0x3f) {
- type = CODEC_TYPE_SUBTITLE;
- codec_id = CODEC_ID_DVD_SUBTITLE;
- } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
- type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_VC1;
- } else {
- skip:
- /* skip packet */
- url_fskip(s->pb, len);
- goto redo;
- }
- /* no stream found: add a new stream */
- st = av_new_stream(s, startcode);
- if (!st)
- goto skip;
- st->codec->codec_type = type;
- st->codec->codec_id = codec_id;
- if (codec_id != CODEC_ID_PCM_S16BE)
- st->need_parsing = AVSTREAM_PARSE_FULL;
- found:
- if(st->discard >= AVDISCARD_ALL)
- goto skip;
- if (startcode >= 0xa0 && startcode <= 0xaf) {
- int b1, freq;
-
- /* for LPCM, we just skip the header and consider it is raw
- audio data */
- if (len <= 3)
- goto skip;
- get_byte(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
- b1 = get_byte(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
- get_byte(s->pb); /* dynamic range control (0x80 = off) */
- len -= 3;
- freq = (b1 >> 4) & 3;
- st->codec->sample_rate = lpcm_freq_tab[freq];
- st->codec->channels = 1 + (b1 & 7);
- st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 2;
- }
- av_new_packet(pkt, len);
- get_buffer(s->pb, pkt->data, pkt->size);
- pkt->pts = pts;
- pkt->dts = dts;
- pkt->stream_index = st->index;
-#if 0
- av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
- pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
-#endif
-
- return 0;
-}
-
-static int mpegps_read_close(AVFormatContext *s)
-{
- return 0;
-}
-
-static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
- int64_t *ppos, int64_t pos_limit)
-{
- int len, startcode;
- int64_t pos, pts, dts;
-
- pos = *ppos;
-#ifdef DEBUG_SEEK
- printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
-#endif
- url_fseek(s->pb, pos, SEEK_SET);
- for(;;) {
- len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
- if (len < 0) {
-#ifdef DEBUG_SEEK
- printf("none (ret=%d)\n", len);
-#endif
- return AV_NOPTS_VALUE;
- }
- if (startcode == s->streams[stream_index]->id &&
- dts != AV_NOPTS_VALUE) {
- break;
- }
- url_fskip(s->pb, len);
- }
-#ifdef DEBUG_SEEK
- printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
-#endif
- *ppos = pos;
- return dts;
-}
-
-AVInputFormat mpegps_demuxer = {
- "mpeg",
- "MPEG PS format",
- sizeof(MpegDemuxContext),
- mpegps_probe,
- mpegps_read_header,
- mpegps_read_packet,
- mpegps_read_close,
- NULL, //mpegps_read_seek,
- mpegps_read_dts,
- .flags = AVFMT_SHOW_IDS,
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-01 21:17:38 +0000