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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 cdxa_probe(AVProbeData *p)

  36. {

  37.     /* check file header */

  38.     if (p->buf[0] == 'R' && p->buf[1] == 'I' &&

  39.         p->buf[2] == 'F' && p->buf[3] == 'F' &&

  40.         p->buf[8] == 'C' && p->buf[9] == 'D' &&

  41.         p->buf[10] == 'X' && p->buf[11] == 'A')

  42.         return AVPROBE_SCORE_MAX;

  43.     else

  44.         return 0;

  45. }

  46. 

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

  48.     int pes1;

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

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

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

  52. 

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

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

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

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

  57.         p+=5;

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

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

  60.         p+=10;

  61.     }else

  62.         pes1 = *p == 0x0F;

  63. 

  64.     return pes1||pes2;

  65. }

  66. 

  67. static int mpegps_probe(AVProbeData *p)

  68. {

  69.     uint32_t code= -1;

  70.     int sys=0, pspack=0, priv1=0, vid=0, audio=0;

  71.     int i;

  72.     int score=0;

  73. 

  74.     score = cdxa_probe(p);

  75.     if (score > 0) return score;

  76. 

  77.     /* Search for MPEG stream */

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

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

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

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

  82. 

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

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

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

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

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

  88.         }

  89.     }

  90. 

  91.     if(vid || audio)            /* invalid VDR files nd short PES streams */

  92.         score= AVPROBE_SCORE_MAX/4;

  93. 

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

  95.     if(sys && sys*9 <= pspack*10)

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

  97.     if((priv1 || vid || audio) && (priv1+vid+audio)*9 <= pspack*10)

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

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

  100.         return AVPROBE_SCORE_MAX/2+2;

  101. 

  102.     //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1

  103.     return score;

  104. }

  105. 

  106. 

  107. typedef struct MpegDemuxContext {

  108.     int32_t header_state;

  109.     unsigned char psm_es_type[256];

  110. } MpegDemuxContext;

  111. 

  112. static int mpegps_read_header(AVFormatContext *s,

  113.                               AVFormatParameters *ap)

  114. {

  115.     MpegDemuxContext *m = s->priv_data;

  116.     m->header_state = 0xff;

  117.     s->ctx_flags |= AVFMTCTX_NOHEADER;

  118. 

  119.     /* no need to do more */

  120.     return 0;

  121. }

  122. 

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

  124. {

  125.     int64_t pts;

  126.     int val;

  127. 

  128.     if (c < 0)

  129.         c = get_byte(pb);

  130.     pts = (int64_t)((c >> 1) & 0x07) << 30;

  131.     val = get_be16(pb);

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

  133.     val = get_be16(pb);

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

  135.     return pts;

  136. }

  137. 

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

  139.                                 int32_t *header_state)

  140. {

  141.     unsigned int state, v;

  142.     int val, n;

  143. 

  144.     state = *header_state;

  145.     n = *size_ptr;

  146.     while (n > 0) {

  147.         if (url_feof(pb))

  148.             break;

  149.         v = get_byte(pb);

  150.         n--;

  151.         if (state == 0x000001) {

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

  153.             val = state;

  154.             goto found;

  155.         }

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

  157.     }

  158.     val = -1;

  159.  found:

  160.     *header_state = state;

  161.     *size_ptr = n;

  162.     return val;

  163. }

  164. 

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

  166. /* XXX: optimize */

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

  168. {

  169.     int64_t pos, pos_start;

  170.     int max_size, start_code;

  171. 

  172.     max_size = *size_ptr;

  173.     pos_start = url_ftell(pb);

  174. 

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

  176.     pos = pos_start - 16386;

  177.     if (pos < 0)

  178.         pos = 0;

  179.     url_fseek(pb, pos, SEEK_SET);

  180.     get_byte(pb);

  181. 

  182.     pos = pos_start;

  183.     for(;;) {

  184.         pos--;

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

  186.             start_code = -1;

  187.             goto the_end;

  188.         }

  189.         url_fseek(pb, pos, SEEK_SET);

  190.         start_code = get_be32(pb);

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

  192.             break;

  193.     }

  194.  the_end:

  195.     *size_ptr = pos_start - pos;

  196.     return start_code;

  197. }

  198. #endif

  199. 

  200. /**

  201.  * Extracts stream types from a program stream map

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

  203.  *

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

  205.  */

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

  207. {

  208.     int psm_length, ps_info_length, es_map_length;

  209. 

  210.     psm_length = get_be16(pb);

  211.     get_byte(pb);

  212.     get_byte(pb);

  213.     ps_info_length = get_be16(pb);

  214. 

  215.     /* skip program_stream_info */

  216.     url_fskip(pb, ps_info_length);

  217.     es_map_length = get_be16(pb);

  218. 

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

  220.     while (es_map_length >= 4){

  221.         unsigned char type = get_byte(pb);

  222.         unsigned char es_id = get_byte(pb);

  223.         uint16_t es_info_length = get_be16(pb);

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

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

  226.         /* skip program_stream_info */

  227.         url_fskip(pb, es_info_length);

  228.         es_map_length -= 4 + es_info_length;

  229.     }

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

  231.     return 2 + psm_length;

  232. }

  233. 

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

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

  236.  */

  237. static int mpegps_read_pes_header(AVFormatContext *s,

  238.                                   int64_t *ppos, int *pstart_code,

  239.                                   int64_t *ppts, int64_t *pdts)

  240. {

  241.     MpegDemuxContext *m = s->priv_data;

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

  243.     int pes_ext, ext2_len, id_ext, skip;

  244.     int64_t pts, dts;

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

  246. 

  247.  error_redo:

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

  249.  redo:

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

  251.         m->header_state = 0xff;

  252.         size = MAX_SYNC_SIZE;

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

  254.         last_sync = url_ftell(&s->pb);

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

  256.     if (startcode < 0)

  257.         return AVERROR(EIO);

  258.     if (startcode == PACK_START_CODE)

  259.         goto redo;

  260.     if (startcode == SYSTEM_HEADER_START_CODE)

  261.         goto redo;

  262.     if (startcode == PADDING_STREAM ||

  263.         startcode == PRIVATE_STREAM_2) {

  264.         /* skip them */

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

  266.         url_fskip(&s->pb, len);

  267.         goto redo;

  268.     }

  269.     if (startcode == PROGRAM_STREAM_MAP) {

  270.         mpegps_psm_parse(m, &s->pb);

  271.         goto redo;

  272.     }

  273. 

  274.     /* find matching stream */

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

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

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

  278.         goto redo;

  279.     if (ppos) {

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

  281.     }

  282.     len = get_be16(&s->pb);

  283.     pts =

  284.     dts = AV_NOPTS_VALUE;

  285.     /* stuffing */

  286.     for(;;) {

  287.         if (len < 1)

  288.             goto error_redo;

  289.         c = get_byte(&s->pb);

  290.         len--;

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

  292.         if (c != 0xff)

  293.             break;

  294.     }

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

  296.         /* buffer scale & size */

  297.         get_byte(&s->pb);

  298.         c = get_byte(&s->pb);

  299.         len -= 2;

  300.     }

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

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

  303.         len -= 4;

  304.         if (c & 0x10){

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

  306.             len -= 5;

  307.         }

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

  309.         /* mpeg 2 PES */

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

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

  312.             /* Encrypted multiplex not handled */

  313.             goto redo;

  314.         }

  315. #endif

  316.         flags = get_byte(&s->pb);

  317.         header_len = get_byte(&s->pb);

  318.         len -= 2;

  319.         if (header_len > len)

  320.             goto error_redo;

  321.         len -= header_len;

  322.         if (flags & 0x80) {

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

  324.             header_len -= 5;

  325.             if (flags & 0x40) {

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

  327.                 header_len -= 5;

  328.             }

  329.         }

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

  331.             pes_ext = get_byte(&s->pb);

  332.             header_len--;

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

  334.                 goto error_redo;

  335.             }

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

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

  338.             skip += skip & 0x9;

  339.             url_fskip(&s->pb, skip);

  340.             header_len -= skip;

  341. 

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

  343.                 ext2_len = get_byte(&s->pb);

  344.                 header_len--;

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

  346.                     id_ext = get_byte(&s->pb);

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

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

  349.                     header_len--;

  350.                 }

  351.             }

  352.         }

  353.         if(header_len < 0)

  354.             goto error_redo;

  355.         url_fskip(&s->pb, header_len);

  356.     }

  357.     else if( c!= 0xf )

  358.         goto redo;

  359. 

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

  361.         startcode = get_byte(&s->pb);

  362.         len--;

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

  364.             /* audio: skip header */

  365.             get_byte(&s->pb);

  366.             get_byte(&s->pb);

  367.             get_byte(&s->pb);

  368.             len -= 3;

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

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

  371.                 get_byte(&s->pb);

  372.                 len--;

  373.             }

  374.         }

  375.     }

  376.     if(len<0)

  377.         goto error_redo;

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

  379.         int i;

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

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

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

  383.             }

  384.         }

  385.     }

  386. 

  387.     *pstart_code = startcode;

  388.     *ppts = pts;

  389.     *pdts = dts;

  390.     return len;

  391. }

  392. 

  393. static int mpegps_read_packet(AVFormatContext *s,

  394.                               AVPacket *pkt)

  395. {

  396.     MpegDemuxContext *m = s->priv_data;

  397.     AVStream *st;

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

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

  400. 

  401.  redo:

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

  403.     if (len < 0)

  404.         return len;

  405. 

  406.     /* now find stream */

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

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

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

  410.             goto found;

  411.     }

  412. 

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

  414.     if(es_type > 0){

  415.         if(es_type == STREAM_TYPE_VIDEO_MPEG1){

  416.             codec_id = CODEC_ID_MPEG2VIDEO;

  417.             type = CODEC_TYPE_VIDEO;

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

  419.             codec_id = CODEC_ID_MPEG2VIDEO;

  420.             type = CODEC_TYPE_VIDEO;

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

  422.                   es_type == STREAM_TYPE_AUDIO_MPEG2){

  423.             codec_id = CODEC_ID_MP3;

  424.             type = CODEC_TYPE_AUDIO;

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

  426.             codec_id = CODEC_ID_AAC;

  427.             type = CODEC_TYPE_AUDIO;

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

  429.             codec_id = CODEC_ID_MPEG4;

  430.             type = CODEC_TYPE_VIDEO;

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

  432.             codec_id = CODEC_ID_H264;

  433.             type = CODEC_TYPE_VIDEO;

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

  435.             codec_id = CODEC_ID_AC3;

  436.             type = CODEC_TYPE_AUDIO;

  437.         } else {

  438.             goto skip;

  439.         }

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

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

  442.         unsigned char buf[8];

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

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

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

  446.             codec_id = CODEC_ID_CAVS;

  447.         else

  448.             codec_id = CODEC_ID_MPEG2VIDEO;

  449.         type = CODEC_TYPE_VIDEO;

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

  451.         type = CODEC_TYPE_AUDIO;

  452.         codec_id = CODEC_ID_MP2;

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

  454.         type = CODEC_TYPE_AUDIO;

  455.         codec_id = CODEC_ID_AC3;

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

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

  458.         /* 0x90 - 0x97 is reserved for SDDS in DVD specs */

  459.         type = CODEC_TYPE_AUDIO;

  460.         codec_id = CODEC_ID_DTS;

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

  462.         type = CODEC_TYPE_AUDIO;

  463.         codec_id = CODEC_ID_PCM_S16BE;

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

  465.         type = CODEC_TYPE_AUDIO;

  466.         codec_id = CODEC_ID_MLP;

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

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

  469.         type = CODEC_TYPE_AUDIO;

  470.         codec_id = CODEC_ID_AC3;

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

  472.         type = CODEC_TYPE_SUBTITLE;

  473.         codec_id = CODEC_ID_DVD_SUBTITLE;

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

  475.         type = CODEC_TYPE_VIDEO;

  476.         codec_id = CODEC_ID_VC1;

  477.     } else {

  478.     skip:

  479.         /* skip packet */

  480.         url_fskip(&s->pb, len);

  481.         goto redo;

  482.     }

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

  484.     st = av_new_stream(s, startcode);

  485.     if (!st)

  486.         goto skip;

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

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

  489.     if (codec_id != CODEC_ID_PCM_S16BE)

  490.         st->need_parsing = AVSTREAM_PARSE_FULL;

  491.  found:

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

  493.         goto skip;

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

  495.         int b1, freq;

  496. 

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

  498.            audio data */

  499.         if (len <= 3)

  500.             goto skip;

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

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

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

  504.         len -= 3;

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

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

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

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

  509.     }

  510.     av_new_packet(pkt, len);

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

  512.     pkt->pts = pts;

  513.     pkt->dts = dts;

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

  515. #if 0

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

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

  518. #endif

  519. 

  520.     return 0;

  521. }

  522. 

  523. static int mpegps_read_close(AVFormatContext *s)

  524. {

  525.     return 0;

  526. }

  527. 

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

  529.                                int64_t *ppos, int64_t pos_limit)

  530. {

  531.     int len, startcode;

  532.     int64_t pos, pts, dts;

  533. 

  534.     pos = *ppos;

  535. #ifdef DEBUG_SEEK

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

  537. #endif

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

  539.     for(;;) {

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

  541.         if (len < 0) {

  542. #ifdef DEBUG_SEEK

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

  544. #endif

  545.             return AV_NOPTS_VALUE;

  546.         }

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

  548.             dts != AV_NOPTS_VALUE) {

  549.             break;

  550.         }

  551.         url_fskip(&s->pb, len);

  552.     }

  553. #ifdef DEBUG_SEEK

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

  555. #endif

  556.     *ppos = pos;

  557.     return dts;

  558. }

  559. 

  560. AVInputFormat mpegps_demuxer = {

  561.     "mpeg",

  562.     "MPEG PS format",

  563.     sizeof(MpegDemuxContext),

  564.     mpegps_probe,

  565.     mpegps_read_header,

  566.     mpegps_read_packet,

  567.     mpegps_read_close,

  568.     NULL, //mpegps_read_seek,

  569.     mpegps_read_dts,

  570.     .flags = AVFMT_SHOW_IDS,

  571. };