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FFmpeg/libavformat/mpeg.c

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  1. /*

  2.  * MPEG1/2 demuxer

  3.  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "avformat.h"

  23. #include "mpeg.h"

  24. 

  25. //#define DEBUG_SEEK

  26. 

  27. #undef NDEBUG

  28. #include <assert.h>

  29. 

  30. /*********************************************/

  31. /* demux code */

  32. 

  33. #define MAX_SYNC_SIZE 100000

  34. 

  35. static int check_pes(uint8_t *p, uint8_t *end){

  36.     int pes1;

  37.     int pes2=      (p[3] & 0xC0) == 0x80

  38.                 && (p[4] & 0xC0) != 0x40

  39.                 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));

  40. 

  41.     for(p+=3; p<end && *p == 0xFF; p++);

  42.     if((*p&0xC0) == 0x40) p+=2;

  43.     if((*p&0xF0) == 0x20){

  44.         pes1= p[0]&p[2]&p[4]&1;

  45.         p+=5;

  46.     }else if((*p&0xF0) == 0x30){

  47.         pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;

  48.         p+=10;

  49.     }else

  50.         pes1 = *p == 0x0F;

  51. 

  52.     return pes1||pes2;

  53. }

  54. 

  55. static int mpegps_probe(AVProbeData *p)

  56. {

  57.     uint32_t code= -1;

  58.     int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;

  59.     int i;

  60.     int score=0;

  61. 

  62.     for(i=0; i<p->buf_size; i++){

  63.         code = (code<<8) + p->buf[i];

  64.         if ((code & 0xffffff00) == 0x100) {

  65.             int pes= check_pes(p->buf+i, p->buf+p->buf_size);

  66. 

  67.             if(code == SYSTEM_HEADER_START_CODE) sys++;

  68.             else if(code == PRIVATE_STREAM_1)    priv1++;

  69.             else if(code == PACK_START_CODE)     pspack++;

  70.             else if((code & 0xf0) == VIDEO_ID && pes) vid++;

  71.             else if((code & 0xe0) == AUDIO_ID && pes) audio++;

  72. 

  73.             else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;

  74.             else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;

  75.         }

  76.     }

  77. 

  78.     if(vid+audio > invalid)     /* invalid VDR files nd short PES streams */

  79.         score= AVPROBE_SCORE_MAX/4;

  80. 

  81. //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, p->buf_size);

  82.     if(sys>invalid && sys*9 <= pspack*10)

  83.         return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg

  84.     if(priv1 + vid + audio > invalid && (priv1+vid+audio)*9 <= pspack*10)

  85.         return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg

  86.     if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */

  87.         return AVPROBE_SCORE_MAX/2+2;

  88. 

  89.     //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1

  90.     return score;

  91. }

  92. 

  93. 

  94. typedef struct MpegDemuxContext {

  95.     int32_t header_state;

  96.     unsigned char psm_es_type[256];

  97.     int sofdec;

  98. } MpegDemuxContext;

  99. 

  100. static int mpegps_read_header(AVFormatContext *s,

  101.                               AVFormatParameters *ap)

  102. {

  103.     MpegDemuxContext *m = s->priv_data;

  104.     const char *sofdec = "Sofdec";

  105.     int v, i = 0;

  106. 

  107.     m->header_state = 0xff;

  108.     s->ctx_flags |= AVFMTCTX_NOHEADER;

  109. 

  110.     m->sofdec = -1;

  111.     do {

  112.         v = get_byte(s->pb);

  113.         m->header_state = m->header_state << 8 | v;

  114.         m->sofdec++;

  115.     } while (v == sofdec[i] && i++ < 6);

  116. 

  117.     /* no need to do more */

  118.     return 0;

  119. }

  120. 

  121. static int64_t get_pts(ByteIOContext *pb, int c)

  122. {

  123.     int64_t pts;

  124.     int val;

  125. 

  126.     if (c < 0)

  127.         c = get_byte(pb);

  128.     pts = (int64_t)(c & 0x0e) << 29;

  129.     val = get_be16(pb);

  130.     pts |= (int64_t)(val >> 1) << 15;

  131.     val = get_be16(pb);

  132.     pts |= (int64_t)(val >> 1);

  133.     return pts;

  134. }

  135. 

  136. static int find_next_start_code(ByteIOContext *pb, int *size_ptr,

  137.                                 int32_t *header_state)

  138. {

  139.     unsigned int state, v;

  140.     int val, n;

  141. 

  142.     state = *header_state;

  143.     n = *size_ptr;

  144.     while (n > 0) {

  145.         if (url_feof(pb))

  146.             break;

  147.         v = get_byte(pb);

  148.         n--;

  149.         if (state == 0x000001) {

  150.             state = ((state << 8) | v) & 0xffffff;

  151.             val = state;

  152.             goto found;

  153.         }

  154.         state = ((state << 8) | v) & 0xffffff;

  155.     }

  156.     val = -1;

  157.  found:

  158.     *header_state = state;

  159.     *size_ptr = n;

  160.     return val;

  161. }

  162. 

  163. #if 0 /* unused, remove? */

  164. /* XXX: optimize */

  165. static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)

  166. {

  167.     int64_t pos, pos_start;

  168.     int max_size, start_code;

  169. 

  170.     max_size = *size_ptr;

  171.     pos_start = url_ftell(pb);

  172. 

  173.     /* in order to go faster, we fill the buffer */

  174.     pos = pos_start - 16386;

  175.     if (pos < 0)

  176.         pos = 0;

  177.     url_fseek(pb, pos, SEEK_SET);

  178.     get_byte(pb);

  179. 

  180.     pos = pos_start;

  181.     for(;;) {

  182.         pos--;

  183.         if (pos < 0 || (pos_start - pos) >= max_size) {

  184.             start_code = -1;

  185.             goto the_end;

  186.         }

  187.         url_fseek(pb, pos, SEEK_SET);

  188.         start_code = get_be32(pb);

  189.         if ((start_code & 0xffffff00) == 0x100)

  190.             break;

  191.     }

  192.  the_end:

  193.     *size_ptr = pos_start - pos;

  194.     return start_code;

  195. }

  196. #endif

  197. 

  198. /**

  199.  * Extracts stream types from a program stream map

  200.  * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35

  201.  *

  202.  * @return number of bytes occupied by PSM in the bitstream

  203.  */

  204. static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)

  205. {

  206.     int psm_length, ps_info_length, es_map_length;

  207. 

  208.     psm_length = get_be16(pb);

  209.     get_byte(pb);

  210.     get_byte(pb);

  211.     ps_info_length = get_be16(pb);

  212. 

  213.     /* skip program_stream_info */

  214.     url_fskip(pb, ps_info_length);

  215.     es_map_length = get_be16(pb);

  216. 

  217.     /* at least one es available? */

  218.     while (es_map_length >= 4){

  219.         unsigned char type = get_byte(pb);

  220.         unsigned char es_id = get_byte(pb);

  221.         uint16_t es_info_length = get_be16(pb);

  222.         /* remember mapping from stream id to stream type */

  223.         m->psm_es_type[es_id] = type;

  224.         /* skip program_stream_info */

  225.         url_fskip(pb, es_info_length);

  226.         es_map_length -= 4 + es_info_length;

  227.     }

  228.     get_be32(pb); /* crc32 */

  229.     return 2 + psm_length;

  230. }

  231. 

  232. /* read the next PES header. Return its position in ppos

  233.    (if not NULL), and its start code, pts and dts.

  234.  */

  235. static int mpegps_read_pes_header(AVFormatContext *s,

  236.                                   int64_t *ppos, int *pstart_code,

  237.                                   int64_t *ppts, int64_t *pdts)

  238. {

  239.     MpegDemuxContext *m = s->priv_data;

  240.     int len, size, startcode, c, flags, header_len;

  241.     int pes_ext, ext2_len, id_ext, skip;

  242.     int64_t pts, dts;

  243.     int64_t last_sync= url_ftell(s->pb);

  244. 

  245.  error_redo:

  246.         url_fseek(s->pb, last_sync, SEEK_SET);

  247.  redo:

  248.         /* next start code (should be immediately after) */

  249.         m->header_state = 0xff;

  250.         size = MAX_SYNC_SIZE;

  251.         startcode = find_next_start_code(s->pb, &size, &m->header_state);

  252.         last_sync = url_ftell(s->pb);

  253.     //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(s->pb));

  254.     if (startcode < 0)

  255.         return AVERROR(EIO);

  256.     if (startcode == PACK_START_CODE)

  257.         goto redo;

  258.     if (startcode == SYSTEM_HEADER_START_CODE)

  259.         goto redo;

  260.     if (startcode == PADDING_STREAM) {

  261.         url_fskip(s->pb, get_be16(s->pb));

  262.         goto redo;

  263.     }

  264.     if (startcode == PRIVATE_STREAM_2) {

  265.         len = get_be16(s->pb);

  266.         if (!m->sofdec) {

  267.             while (len-- >= 6) {

  268.                 if (get_byte(s->pb) == 'S') {

  269.                     uint8_t buf[5];

  270.                     get_buffer(s->pb, buf, sizeof(buf));

  271.                     m->sofdec = !memcmp(buf, "ofdec", 5);

  272.                     len -= sizeof(buf);

  273.                     break;

  274.                 }

  275.             }

  276.             m->sofdec -= !m->sofdec;

  277.         }

  278.         url_fskip(s->pb, len);

  279.         goto redo;

  280.     }

  281.     if (startcode == PROGRAM_STREAM_MAP) {

  282.         mpegps_psm_parse(m, s->pb);

  283.         goto redo;

  284.     }

  285. 

  286.     /* find matching stream */

  287.     if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||

  288.           (startcode >= 0x1e0 && startcode <= 0x1ef) ||

  289.           (startcode == 0x1bd) || (startcode == 0x1fd)))

  290.         goto redo;

  291.     if (ppos) {

  292.         *ppos = url_ftell(s->pb) - 4;

  293.     }

  294.     len = get_be16(s->pb);

  295.     pts =

  296.     dts = AV_NOPTS_VALUE;

  297.     /* stuffing */

  298.     for(;;) {

  299.         if (len < 1)

  300.             goto error_redo;

  301.         c = get_byte(s->pb);

  302.         len--;

  303.         /* XXX: for mpeg1, should test only bit 7 */

  304.         if (c != 0xff)

  305.             break;

  306.     }

  307.     if ((c & 0xc0) == 0x40) {

  308.         /* buffer scale & size */

  309.         get_byte(s->pb);

  310.         c = get_byte(s->pb);

  311.         len -= 2;

  312.     }

  313.     if ((c & 0xe0) == 0x20) {

  314.         dts = pts = get_pts(s->pb, c);

  315.         len -= 4;

  316.         if (c & 0x10){

  317.             dts = get_pts(s->pb, -1);

  318.             len -= 5;

  319.         }

  320.     } else if ((c & 0xc0) == 0x80) {

  321.         /* mpeg 2 PES */

  322. #if 0 /* some streams have this field set for no apparent reason */

  323.         if ((c & 0x30) != 0) {

  324.             /* Encrypted multiplex not handled */

  325.             goto redo;

  326.         }

  327. #endif

  328.         flags = get_byte(s->pb);

  329.         header_len = get_byte(s->pb);

  330.         len -= 2;

  331.         if (header_len > len)

  332.             goto error_redo;

  333.         len -= header_len;

  334.         if (flags & 0x80) {

  335.             dts = pts = get_pts(s->pb, -1);

  336.             header_len -= 5;

  337.             if (flags & 0x40) {

  338.                 dts = get_pts(s->pb, -1);

  339.                 header_len -= 5;

  340.             }

  341.         }

  342.         if (flags & 0x01) { /* PES extension */

  343.             pes_ext = get_byte(s->pb);

  344.             header_len--;

  345.             if (pes_ext & 0x40) { /* pack header - should be zero in PS */

  346.                 goto error_redo;

  347.             }

  348.             /* Skip PES private data, program packet sequence counter and P-STD buffer */

  349.             skip = (pes_ext >> 4) & 0xb;

  350.             skip += skip & 0x9;

  351.             url_fskip(s->pb, skip);

  352.             header_len -= skip;

  353. 

  354.             if (pes_ext & 0x01) { /* PES extension 2 */

  355.                 ext2_len = get_byte(s->pb);

  356.                 header_len--;

  357.                 if ((ext2_len & 0x7f) > 0) {

  358.                     id_ext = get_byte(s->pb);

  359.                     if ((id_ext & 0x80) == 0)

  360.                         startcode = ((startcode & 0xff) << 8) | id_ext;

  361.                     header_len--;

  362.                 }

  363.             }

  364.         }

  365.         if(header_len < 0)

  366.             goto error_redo;

  367.         url_fskip(s->pb, header_len);

  368.     }

  369.     else if( c!= 0xf )

  370.         goto redo;

  371. 

  372.     if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {

  373.         startcode = get_byte(s->pb);

  374.         len--;

  375.         if (startcode >= 0x80 && startcode <= 0xcf) {

  376.             /* audio: skip header */

  377.             get_byte(s->pb);

  378.             get_byte(s->pb);

  379.             get_byte(s->pb);

  380.             len -= 3;

  381.             if (startcode >= 0xb0 && startcode <= 0xbf) {

  382.                 /* MLP/TrueHD audio has a 4-byte header */

  383.                 get_byte(s->pb);

  384.                 len--;

  385.             }

  386.         }

  387.     }

  388.     if(len<0)

  389.         goto error_redo;

  390.     if(dts != AV_NOPTS_VALUE && ppos){

  391.         int i;

  392.         for(i=0; i<s->nb_streams; i++){

  393.             if(startcode == s->streams[i]->id) {

  394.                 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);

  395.             }

  396.         }

  397.     }

  398. 

  399.     *pstart_code = startcode;

  400.     *ppts = pts;

  401.     *pdts = dts;

  402.     return len;

  403. }

  404. 

  405. static int mpegps_read_packet(AVFormatContext *s,

  406.                               AVPacket *pkt)

  407. {

  408.     MpegDemuxContext *m = s->priv_data;

  409.     AVStream *st;

  410.     int len, startcode, i, type, codec_id = 0, es_type;

  411.     int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work

  412. 

  413.  redo:

  414.     len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);

  415.     if (len < 0)

  416.         return len;

  417. 

  418.     /* now find stream */

  419.     for(i=0;i<s->nb_streams;i++) {

  420.         st = s->streams[i];

  421.         if (st->id == startcode)

  422.             goto found;

  423.     }

  424. 

  425.     es_type = m->psm_es_type[startcode & 0xff];

  426.     if(es_type > 0){

  427.         if(es_type == STREAM_TYPE_VIDEO_MPEG1){

  428.             codec_id = CODEC_ID_MPEG2VIDEO;

  429.             type = CODEC_TYPE_VIDEO;

  430.         } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){

  431.             codec_id = CODEC_ID_MPEG2VIDEO;

  432.             type = CODEC_TYPE_VIDEO;

  433.         } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||

  434.                   es_type == STREAM_TYPE_AUDIO_MPEG2){

  435.             codec_id = CODEC_ID_MP3;

  436.             type = CODEC_TYPE_AUDIO;

  437.         } else if(es_type == STREAM_TYPE_AUDIO_AAC){

  438.             codec_id = CODEC_ID_AAC;

  439.             type = CODEC_TYPE_AUDIO;

  440.         } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){

  441.             codec_id = CODEC_ID_MPEG4;

  442.             type = CODEC_TYPE_VIDEO;

  443.         } else if(es_type == STREAM_TYPE_VIDEO_H264){

  444.             codec_id = CODEC_ID_H264;

  445.             type = CODEC_TYPE_VIDEO;

  446.         } else if(es_type == STREAM_TYPE_AUDIO_AC3){

  447.             codec_id = CODEC_ID_AC3;

  448.             type = CODEC_TYPE_AUDIO;

  449.         } else {

  450.             goto skip;

  451.         }

  452.     } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {

  453.         static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };

  454.         unsigned char buf[8];

  455.         get_buffer(s->pb, buf, 8);

  456.         url_fseek(s->pb, -8, SEEK_CUR);

  457.         if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))

  458.             codec_id = CODEC_ID_CAVS;

  459.         else

  460.             codec_id = CODEC_ID_MPEG2VIDEO;

  461.         type = CODEC_TYPE_VIDEO;

  462.     } else if (startcode >= 0x1c0 && startcode <= 0x1df) {

  463.         type = CODEC_TYPE_AUDIO;

  464.         codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;

  465.     } else if (startcode >= 0x80 && startcode <= 0x87) {

  466.         type = CODEC_TYPE_AUDIO;

  467.         codec_id = CODEC_ID_AC3;

  468.     } else if ((startcode >= 0x88 && startcode <= 0x8f)

  469.                ||( startcode >= 0x98 && startcode <= 0x9f)) {

  470.         /* 0x90 - 0x97 is reserved for SDDS in DVD specs */

  471.         type = CODEC_TYPE_AUDIO;

  472.         codec_id = CODEC_ID_DTS;

  473.     } else if (startcode >= 0xa0 && startcode <= 0xaf) {

  474.         type = CODEC_TYPE_AUDIO;

  475.         codec_id = CODEC_ID_PCM_S16BE;

  476.     } else if (startcode >= 0xb0 && startcode <= 0xbf) {

  477.         type = CODEC_TYPE_AUDIO;

  478.         codec_id = CODEC_ID_MLP;

  479.     } else if (startcode >= 0xc0 && startcode <= 0xcf) {

  480.         /* Used for both AC-3 and E-AC-3 in EVOB files */

  481.         type = CODEC_TYPE_AUDIO;

  482.         codec_id = CODEC_ID_AC3;

  483.     } else if (startcode >= 0x20 && startcode <= 0x3f) {

  484.         type = CODEC_TYPE_SUBTITLE;

  485.         codec_id = CODEC_ID_DVD_SUBTITLE;

  486.     } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {

  487.         type = CODEC_TYPE_VIDEO;

  488.         codec_id = CODEC_ID_VC1;

  489.     } else {

  490.     skip:

  491.         /* skip packet */

  492.         url_fskip(s->pb, len);

  493.         goto redo;

  494.     }

  495.     /* no stream found: add a new stream */

  496.     st = av_new_stream(s, startcode);

  497.     if (!st)

  498.         goto skip;

  499.     st->codec->codec_type = type;

  500.     st->codec->codec_id = codec_id;

  501.     if (codec_id != CODEC_ID_PCM_S16BE)

  502.         st->need_parsing = AVSTREAM_PARSE_FULL;

  503.  found:

  504.     if(st->discard >= AVDISCARD_ALL)

  505.         goto skip;

  506.     if (startcode >= 0xa0 && startcode <= 0xaf) {

  507.         int b1, freq;

  508. 

  509.         /* for LPCM, we just skip the header and consider it is raw

  510.            audio data */

  511.         if (len <= 3)

  512.             goto skip;

  513.         get_byte(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */

  514.         b1 = get_byte(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */

  515.         get_byte(s->pb); /* dynamic range control (0x80 = off) */

  516.         len -= 3;

  517.         freq = (b1 >> 4) & 3;

  518.         st->codec->sample_rate = lpcm_freq_tab[freq];

  519.         st->codec->channels = 1 + (b1 & 7);

  520.         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 2;

  521.     }

  522.     av_new_packet(pkt, len);

  523.     get_buffer(s->pb, pkt->data, pkt->size);

  524.     pkt->pts = pts;

  525.     pkt->dts = dts;

  526.     pkt->stream_index = st->index;

  527. #if 0

  528.     av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",

  529.            pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);

  530. #endif

  531. 

  532.     return 0;

  533. }

  534. 

  535. static int mpegps_read_close(AVFormatContext *s)

  536. {

  537.     return 0;

  538. }

  539. 

  540. static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,

  541.                                int64_t *ppos, int64_t pos_limit)

  542. {

  543.     int len, startcode;

  544.     int64_t pos, pts, dts;

  545. 

  546.     pos = *ppos;

  547. #ifdef DEBUG_SEEK

  548.     printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);

  549. #endif

  550.     url_fseek(s->pb, pos, SEEK_SET);

  551.     for(;;) {

  552.         len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);

  553.         if (len < 0) {

  554. #ifdef DEBUG_SEEK

  555.             printf("none (ret=%d)\n", len);

  556. #endif

  557.             return AV_NOPTS_VALUE;

  558.         }

  559.         if (startcode == s->streams[stream_index]->id &&

  560.             dts != AV_NOPTS_VALUE) {

  561.             break;

  562.         }

  563.         url_fskip(s->pb, len);

  564.     }

  565. #ifdef DEBUG_SEEK

  566.     printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);

  567. #endif

  568.     *ppos = pos;

  569.     return dts;

  570. }

  571. 

  572. AVInputFormat mpegps_demuxer = {

  573.     "mpeg",

  574.     "MPEG PS format",

  575.     sizeof(MpegDemuxContext),

  576.     mpegps_probe,

  577.     mpegps_read_header,

  578.     mpegps_read_packet,

  579.     mpegps_read_close,

  580.     NULL, //mpegps_read_seek,

  581.     mpegps_read_dts,

  582.     .flags = AVFMT_SHOW_IDS,

  583. };