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FFmpeg/libavformat/rmdec.c

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  1. /*

  2.  * "Real" compatible demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

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

  20.  */

  21. 

  22. #include "libavutil/avstring.h"

  23. #include "libavutil/intreadwrite.h"

  24. #include "libavutil/dict.h"

  25. #include "avformat.h"

  26. #include "internal.h"

  27. #include "riff.h"

  28. #include "rmsipr.h"

  29. #include "rm.h"

  30. 

  31. #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/Atrac

  32. #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed

  33. #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8

  34. #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro

  35. #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC

  36. #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC

  37. 

  38. struct RMStream {

  39.     AVPacket pkt;      ///< place to store merged video frame / reordered audio data

  40.     int videobufsize;  ///< current assembled frame size

  41.     int videobufpos;   ///< position for the next slice in the video buffer

  42.     int curpic_num;    ///< picture number of current frame

  43.     int cur_slice, slices;

  44.     int64_t pktpos;    ///< first slice position in file

  45.     /// Audio descrambling matrix parameters

  46.     int64_t audiotimestamp; ///< Audio packet timestamp

  47.     int sub_packet_cnt; // Subpacket counter, used while reading

  48.     int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container

  49.     int audio_framesize; /// Audio frame size from container

  50.     int sub_packet_lengths[16]; /// Length of each subpacket

  51.     int32_t deint_id;  ///< deinterleaver used in audio stream

  52. };

  53. 

  54. typedef struct {

  55.     int nb_packets;

  56.     int old_format;

  57.     int current_stream;

  58.     int remaining_len;

  59.     int audio_stream_num; ///< Stream number for audio packets

  60.     int audio_pkt_cnt; ///< Output packet counter

  61. } RMDemuxContext;

  62. 

  63. static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)

  64. {

  65.     int i;

  66.     char *q, r;

  67. 

  68.     q = buf;

  69.     for(i=0;i<len;i++) {

  70.         r = avio_r8(pb);

  71.         if (i < buf_size - 1)

  72.             *q++ = r;

  73.     }

  74.     if (buf_size > 0) *q = '\0';

  75. }

  76. 

  77. static void get_str8(AVIOContext *pb, char *buf, int buf_size)

  78. {

  79.     get_strl(pb, buf, buf_size, avio_r8(pb));

  80. }

  81. 

  82. static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)

  83. {

  84.     if (size >= 1<<24)

  85.         return -1;

  86.     avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  87.     if (!avctx->extradata)

  88.         return AVERROR(ENOMEM);

  89.     avctx->extradata_size = avio_read(pb, avctx->extradata, size);

  90.     memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  91.     if (avctx->extradata_size != size)

  92.         return AVERROR(EIO);

  93.     return 0;

  94. }

  95. 

  96. static void rm_read_metadata(AVFormatContext *s, int wide)

  97. {

  98.     char buf[1024];

  99.     int i;

  100.     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {

  101.         int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);

  102.         get_strl(s->pb, buf, sizeof(buf), len);

  103.         av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);

  104.     }

  105. }

  106. 

  107. RMStream *ff_rm_alloc_rmstream (void)

  108. {

  109.     RMStream *rms = av_mallocz(sizeof(RMStream));

  110.     rms->curpic_num = -1;

  111.     return rms;

  112. }

  113. 

  114. void ff_rm_free_rmstream (RMStream *rms)

  115. {

  116.     av_free_packet(&rms->pkt);

  117. }

  118. 

  119. static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,

  120.                                      AVStream *st, RMStream *ast, int read_all)

  121. {

  122.     char buf[256];

  123.     uint32_t version;

  124.     int ret;

  125. 

  126.     /* ra type header */

  127.     version = avio_rb16(pb); /* version */

  128.     if (version == 3) {

  129.         int header_size = avio_rb16(pb);

  130.         int64_t startpos = avio_tell(pb);

  131.         avio_skip(pb, 14);

  132.         rm_read_metadata(s, 0);

  133.         if ((startpos + header_size) >= avio_tell(pb) + 2) {

  134.             // fourcc (should always be "lpcJ")

  135.             avio_r8(pb);

  136.             get_str8(pb, buf, sizeof(buf));

  137.         }

  138.         // Skip extra header crap (this should never happen)

  139.         if ((startpos + header_size) > avio_tell(pb))

  140.             avio_skip(pb, header_size + startpos - avio_tell(pb));

  141.         st->codec->sample_rate = 8000;

  142.         st->codec->channels = 1;

  143.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  144.         st->codec->codec_id = AV_CODEC_ID_RA_144;

  145.         ast->deint_id = DEINT_ID_INT0;

  146.     } else {

  147.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  148.         int codecdata_length;

  149.         /* old version (4) */

  150.         avio_skip(pb, 2); /* unused */

  151.         avio_rb32(pb); /* .ra4 */

  152.         avio_rb32(pb); /* data size */

  153.         avio_rb16(pb); /* version2 */

  154.         avio_rb32(pb); /* header size */

  155.         flavor= avio_rb16(pb); /* add codec info / flavor */

  156.         ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */

  157.         avio_rb32(pb); /* ??? */

  158.         avio_rb32(pb); /* ??? */

  159.         avio_rb32(pb); /* ??? */

  160.         ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */

  161.         st->codec->block_align= avio_rb16(pb); /* frame size */

  162.         ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */

  163.         avio_rb16(pb); /* ??? */

  164.         if (version == 5) {

  165.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  166.         }

  167.         st->codec->sample_rate = avio_rb16(pb);

  168.         avio_rb32(pb);

  169.         st->codec->channels = avio_rb16(pb);

  170.         if (version == 5) {

  171.             ast->deint_id = avio_rl32(pb);

  172.             avio_read(pb, buf, 4);

  173.             buf[4] = 0;

  174.         } else {

  175.             get_str8(pb, buf, sizeof(buf)); /* desc */

  176.             ast->deint_id = AV_RL32(buf);

  177.             get_str8(pb, buf, sizeof(buf)); /* desc */

  178.         }

  179.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  180.         st->codec->codec_tag  = AV_RL32(buf);

  181.         st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,

  182.                                                 st->codec->codec_tag);

  183. 

  184.         switch (st->codec->codec_id) {

  185.         case AV_CODEC_ID_AC3:

  186.             st->need_parsing = AVSTREAM_PARSE_FULL;

  187.             break;

  188.         case AV_CODEC_ID_RA_288:

  189.             st->codec->extradata_size= 0;

  190.             ast->audio_framesize = st->codec->block_align;

  191.             st->codec->block_align = coded_framesize;

  192.             break;

  193.         case AV_CODEC_ID_COOK:

  194.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  195.         case AV_CODEC_ID_ATRAC3:

  196.         case AV_CODEC_ID_SIPR:

  197.             avio_rb16(pb); avio_r8(pb);

  198.             if (version == 5)

  199.                 avio_r8(pb);

  200.             codecdata_length = avio_rb32(pb);

  201.             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){

  202.                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");

  203.                 return -1;

  204.             }

  205. 

  206.             ast->audio_framesize = st->codec->block_align;

  207.             if (st->codec->codec_id == AV_CODEC_ID_SIPR) {

  208.                 if (flavor > 3) {

  209.                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",

  210.                            flavor);

  211.                     return -1;

  212.                 }

  213.                 st->codec->block_align = ff_sipr_subpk_size[flavor];

  214.             } else {

  215.                 if(sub_packet_size <= 0){

  216.                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");

  217.                     return -1;

  218.                 }

  219.                 st->codec->block_align = ast->sub_packet_size;

  220.             }

  221.             if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)

  222.                 return ret;

  223.             break;

  224.         case AV_CODEC_ID_AAC:

  225.             avio_rb16(pb); avio_r8(pb);

  226.             if (version == 5)

  227.                 avio_r8(pb);

  228.             codecdata_length = avio_rb32(pb);

  229.             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){

  230.                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");

  231.                 return -1;

  232.             }

  233.             if (codecdata_length >= 1) {

  234.                 avio_r8(pb);

  235.                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)

  236.                     return ret;

  237.             }

  238.             break;

  239.         default:

  240.             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));

  241.         }

  242.         if (ast->deint_id == DEINT_ID_INT4 ||

  243.             ast->deint_id == DEINT_ID_GENR ||

  244.             ast->deint_id == DEINT_ID_SIPR) {

  245.             if (st->codec->block_align <= 0 ||

  246.                 ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||

  247.                 ast->audio_framesize * sub_packet_h < st->codec->block_align)

  248.                 return AVERROR_INVALIDDATA;

  249.             if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)

  250.                 return AVERROR(ENOMEM);

  251.         }

  252.         switch (ast->deint_id) {

  253.         case DEINT_ID_INT4:

  254.             if (ast->coded_framesize > ast->audio_framesize ||

  255.                 sub_packet_h <= 1 ||

  256.                 ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)

  257.                 return AVERROR_INVALIDDATA;

  258.             break;

  259.         case DEINT_ID_GENR:

  260.             if (ast->sub_packet_size <= 0 ||

  261.                 ast->sub_packet_size > ast->audio_framesize)

  262.                 return AVERROR_INVALIDDATA;

  263.             break;

  264.         case DEINT_ID_SIPR:

  265.         case DEINT_ID_INT0:

  266.         case DEINT_ID_VBRS:

  267.         case DEINT_ID_VBRF:

  268.             break;

  269.         default:

  270.             av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);

  271.             return AVERROR_INVALIDDATA;

  272.         }

  273. 

  274.         if (read_all) {

  275.             avio_r8(pb);

  276.             avio_r8(pb);

  277.             avio_r8(pb);

  278.             rm_read_metadata(s, 0);

  279.         }

  280.     }

  281.     return 0;

  282. }

  283. 

  284. int

  285. ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,

  286.                            AVStream *st, RMStream *rst, int codec_data_size)

  287. {

  288.     unsigned int v;

  289.     int size;

  290.     int64_t codec_pos;

  291.     int ret;

  292. 

  293.     avpriv_set_pts_info(st, 64, 1, 1000);

  294.     codec_pos = avio_tell(pb);

  295.     v = avio_rb32(pb);

  296.     if (v == MKTAG(0xfd, 'a', 'r', '.')) {

  297.         /* ra type header */

  298.         if (rm_read_audio_stream_info(s, pb, st, rst, 0))

  299.             return -1;

  300.     } else if (v == MKBETAG('L', 'S', 'D', ':')) {

  301.         avio_seek(pb, -4, SEEK_CUR);

  302.         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size)) < 0)

  303.             return ret;

  304. 

  305.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  306.         st->codec->codec_tag  = AV_RL32(st->codec->extradata);

  307.         st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,

  308.                                                 st->codec->codec_tag);

  309.     } else {

  310.         int fps;

  311.         if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {

  312.         fail1:

  313.             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");

  314.             goto skip;

  315.         }

  316.         st->codec->codec_tag = avio_rl32(pb);

  317.         st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,

  318.                                                st->codec->codec_tag);

  319.         av_dlog(s, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));

  320.         if (st->codec->codec_id == AV_CODEC_ID_NONE)

  321.             goto fail1;

  322.         st->codec->width  = avio_rb16(pb);

  323.         st->codec->height = avio_rb16(pb);

  324.         avio_skip(pb, 2); // looks like bits per sample

  325.         avio_skip(pb, 4); // always zero?

  326.         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  327.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  328.         fps = avio_rb32(pb);

  329. 

  330.         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)

  331.             return ret;

  332. 

  333.         av_reduce(&st->avg_frame_rate.den, &st->avg_frame_rate.num,

  334.                   0x10000, fps, (1 << 30) - 1);

  335. #if FF_API_R_FRAME_RATE

  336.         st->r_frame_rate = st->avg_frame_rate;

  337. #endif

  338.     }

  339. 

  340. skip:

  341.     /* skip codec info */

  342.     size = avio_tell(pb) - codec_pos;

  343.     avio_skip(pb, codec_data_size - size);

  344. 

  345.     return 0;

  346. }

  347. 

  348. /** this function assumes that the demuxer has already seeked to the start

  349.  * of the INDX chunk, and will bail out if not. */

  350. static int rm_read_index(AVFormatContext *s)

  351. {

  352.     AVIOContext *pb = s->pb;

  353.     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;

  354.     AVStream *st;

  355. 

  356.     do {

  357.         if (avio_rl32(pb) != MKTAG('I','N','D','X'))

  358.             return -1;

  359.         size     = avio_rb32(pb);

  360.         if (size < 20)

  361.             return -1;

  362.         avio_skip(pb, 2);

  363.         n_pkts   = avio_rb32(pb);

  364.         str_id   = avio_rb16(pb);

  365.         next_off = avio_rb32(pb);

  366.         for (n = 0; n < s->nb_streams; n++)

  367.             if (s->streams[n]->id == str_id) {

  368.                 st = s->streams[n];

  369.                 break;

  370.             }

  371.         if (n == s->nb_streams) {

  372.             av_log(s, AV_LOG_ERROR,

  373.                    "Invalid stream index %d for index at pos %"PRId64"\n",

  374.                    str_id, avio_tell(pb));

  375.             goto skip;

  376.         } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {

  377.             av_log(s, AV_LOG_ERROR,

  378.                    "Nr. of packets in packet index for stream index %d "

  379.                    "exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",

  380.                    str_id, avio_size(pb), avio_tell(pb),

  381.                    (avio_size(pb) - avio_tell(pb)) / 14);

  382.             goto skip;

  383.         }

  384. 

  385.         for (n = 0; n < n_pkts; n++) {

  386.             avio_skip(pb, 2);

  387.             pts = avio_rb32(pb);

  388.             pos = avio_rb32(pb);

  389.             avio_skip(pb, 4); /* packet no. */

  390. 

  391.             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);

  392.         }

  393. 

  394. skip:

  395.         if (next_off && avio_tell(pb) < next_off &&

  396.             avio_seek(pb, next_off, SEEK_SET) < 0) {

  397.             av_log(s, AV_LOG_ERROR,

  398.                    "Non-linear index detected, not supported\n");

  399.             return -1;

  400.         }

  401.     } while (next_off);

  402. 

  403.     return 0;

  404. }

  405. 

  406. static int rm_read_header_old(AVFormatContext *s)

  407. {

  408.     RMDemuxContext *rm = s->priv_data;

  409.     AVStream *st;

  410. 

  411.     rm->old_format = 1;

  412.     st = avformat_new_stream(s, NULL);

  413.     if (!st)

  414.         return -1;

  415.     st->priv_data = ff_rm_alloc_rmstream();

  416.     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);

  417. }

  418. 

  419. static int rm_read_header(AVFormatContext *s)

  420. {

  421.     RMDemuxContext *rm = s->priv_data;

  422.     AVStream *st;

  423.     AVIOContext *pb = s->pb;

  424.     unsigned int tag;

  425.     int tag_size;

  426.     unsigned int start_time, duration;

  427.     unsigned int data_off = 0, indx_off = 0;

  428.     char buf[128];

  429.     int flags = 0;

  430. 

  431.     tag = avio_rl32(pb);

  432.     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {

  433.         /* very old .ra format */

  434.         return rm_read_header_old(s);

  435.     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {

  436.         return AVERROR(EIO);

  437.     }

  438. 

  439.     tag_size = avio_rb32(pb);

  440.     avio_skip(pb, tag_size - 8);

  441. 

  442.     for(;;) {

  443.         if (pb->eof_reached)

  444.             return -1;

  445.         tag = avio_rl32(pb);

  446.         tag_size = avio_rb32(pb);

  447.         avio_rb16(pb);

  448.         av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",

  449.                 (tag      ) & 0xff,

  450.                 (tag >>  8) & 0xff,

  451.                 (tag >> 16) & 0xff,

  452.                 (tag >> 24) & 0xff,

  453.                 tag,

  454.                 tag_size);

  455.         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))

  456.             return -1;

  457.         switch(tag) {

  458.         case MKTAG('P', 'R', 'O', 'P'):

  459.             /* file header */

  460.             avio_rb32(pb); /* max bit rate */

  461.             avio_rb32(pb); /* avg bit rate */

  462.             avio_rb32(pb); /* max packet size */

  463.             avio_rb32(pb); /* avg packet size */

  464.             avio_rb32(pb); /* nb packets */

  465.             avio_rb32(pb); /* duration */

  466.             avio_rb32(pb); /* preroll */

  467.             indx_off = avio_rb32(pb); /* index offset */

  468.             data_off = avio_rb32(pb); /* data offset */

  469.             avio_rb16(pb); /* nb streams */

  470.             flags = avio_rb16(pb); /* flags */

  471.             break;

  472.         case MKTAG('C', 'O', 'N', 'T'):

  473.             rm_read_metadata(s, 1);

  474.             break;

  475.         case MKTAG('M', 'D', 'P', 'R'):

  476.             st = avformat_new_stream(s, NULL);

  477.             if (!st)

  478.                 return AVERROR(ENOMEM);

  479.             st->id = avio_rb16(pb);

  480.             avio_rb32(pb); /* max bit rate */

  481.             st->codec->bit_rate = avio_rb32(pb); /* bit rate */

  482.             avio_rb32(pb); /* max packet size */

  483.             avio_rb32(pb); /* avg packet size */

  484.             start_time = avio_rb32(pb); /* start time */

  485.             avio_rb32(pb); /* preroll */

  486.             duration = avio_rb32(pb); /* duration */

  487.             st->start_time = start_time;

  488.             st->duration = duration;

  489.             get_str8(pb, buf, sizeof(buf)); /* desc */

  490.             get_str8(pb, buf, sizeof(buf)); /* mimetype */

  491.             st->codec->codec_type = AVMEDIA_TYPE_DATA;

  492.             st->priv_data = ff_rm_alloc_rmstream();

  493.             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,

  494.                                           avio_rb32(pb)) < 0)

  495.                 return -1;

  496.             break;

  497.         case MKTAG('D', 'A', 'T', 'A'):

  498.             goto header_end;

  499.         default:

  500.             /* unknown tag: skip it */

  501.             avio_skip(pb, tag_size - 10);

  502.             break;

  503.         }

  504.     }

  505.  header_end:

  506.     rm->nb_packets = avio_rb32(pb); /* number of packets */

  507.     if (!rm->nb_packets && (flags & 4))

  508.         rm->nb_packets = 3600 * 25;

  509.     avio_rb32(pb); /* next data header */

  510. 

  511.     if (!data_off)

  512.         data_off = avio_tell(pb) - 18;

  513.     if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&

  514.         avio_seek(pb, indx_off, SEEK_SET) >= 0) {

  515.         rm_read_index(s);

  516.         avio_seek(pb, data_off + 18, SEEK_SET);

  517.     }

  518. 

  519.     return 0;

  520. }

  521. 

  522. static int get_num(AVIOContext *pb, int *len)

  523. {

  524.     int n, n1;

  525. 

  526.     n = avio_rb16(pb);

  527.     (*len)-=2;

  528.     n &= 0x7FFF;

  529.     if (n >= 0x4000) {

  530.         return n - 0x4000;

  531.     } else {

  532.         n1 = avio_rb16(pb);

  533.         (*len)-=2;

  534.         return (n << 16) | n1;

  535.     }

  536. }

  537. 

  538. /* multiple of 20 bytes for ra144 (ugly) */

  539. #define RAW_PACKET_SIZE 1000

  540. 

  541. static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){

  542.     RMDemuxContext *rm = s->priv_data;

  543.     AVIOContext *pb = s->pb;

  544.     AVStream *st;

  545.     uint32_t state=0xFFFFFFFF;

  546. 

  547.     while(!pb->eof_reached){

  548.         int len, num, i;

  549.         *pos= avio_tell(pb) - 3;

  550.         if(rm->remaining_len > 0){

  551.             num= rm->current_stream;

  552.             len= rm->remaining_len;

  553.             *timestamp = AV_NOPTS_VALUE;

  554.             *flags= 0;

  555.         }else{

  556.             state= (state<<8) + avio_r8(pb);

  557. 

  558.             if(state == MKBETAG('I', 'N', 'D', 'X')){

  559.                 int n_pkts, expected_len;

  560.                 len = avio_rb32(pb);

  561.                 avio_skip(pb, 2);

  562.                 n_pkts = avio_rb32(pb);

  563.                 expected_len = 20 + n_pkts * 14;

  564.                 if (len == 20)

  565.                     /* some files don't add index entries to chunk size... */

  566.                     len = expected_len;

  567.                 else if (len != expected_len)

  568.                     av_log(s, AV_LOG_WARNING,

  569.                            "Index size %d (%d pkts) is wrong, should be %d.\n",

  570.                            len, n_pkts, expected_len);

  571.                 len -= 14; // we already read part of the index header

  572.                 if(len<0)

  573.                     continue;

  574.                 goto skip;

  575.             } else if (state == MKBETAG('D','A','T','A')) {

  576.                 av_log(s, AV_LOG_WARNING,

  577.                        "DATA tag in middle of chunk, file may be broken.\n");

  578.             }

  579. 

  580.             if(state > (unsigned)0xFFFF || state <= 12)

  581.                 continue;

  582.             len=state - 12;

  583.             state= 0xFFFFFFFF;

  584. 

  585.             num = avio_rb16(pb);

  586.             *timestamp = avio_rb32(pb);

  587.             avio_r8(pb); /* reserved */

  588.             *flags = avio_r8(pb); /* flags */

  589.         }

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

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

  592.             if (num == st->id)

  593.                 break;

  594.         }

  595.         if (i == s->nb_streams) {

  596. skip:

  597.             /* skip packet if unknown number */

  598.             avio_skip(pb, len);

  599.             rm->remaining_len = 0;

  600.             continue;

  601.         }

  602.         *stream_index= i;

  603. 

  604.         return len;

  605.     }

  606.     return -1;

  607. }

  608. 

  609. static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,

  610.                                    RMDemuxContext *rm, RMStream *vst,

  611.                                    AVPacket *pkt, int len, int *pseq,

  612.                                    int64_t *timestamp)

  613. {

  614.     int hdr, seq, pic_num, len2, pos;

  615.     int type;

  616. 

  617.     hdr = avio_r8(pb); len--;

  618.     type = hdr >> 6;

  619. 

  620.     if(type != 3){  // not frame as a part of packet

  621.         seq = avio_r8(pb); len--;

  622.     }

  623.     if(type != 1){  // not whole frame

  624.         len2 = get_num(pb, &len);

  625.         pos  = get_num(pb, &len);

  626.         pic_num = avio_r8(pb); len--;

  627.     }

  628.     if(len<0)

  629.         return -1;

  630.     rm->remaining_len = len;

  631.     if(type&1){     // frame, not slice

  632.         if(type == 3){  // frame as a part of packet

  633.             len= len2;

  634.             *timestamp = pos;

  635.         }

  636.         if(rm->remaining_len < len)

  637.             return -1;

  638.         rm->remaining_len -= len;

  639.         if(av_new_packet(pkt, len + 9) < 0)

  640.             return AVERROR(EIO);

  641.         pkt->data[0] = 0;

  642.         AV_WL32(pkt->data + 1, 1);

  643.         AV_WL32(pkt->data + 5, 0);

  644.         avio_read(pb, pkt->data + 9, len);

  645.         return 0;

  646.     }

  647.     //now we have to deal with single slice

  648. 

  649.     *pseq = seq;

  650.     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){

  651.         vst->slices = ((hdr & 0x3F) << 1) + 1;

  652.         vst->videobufsize = len2 + 8*vst->slices + 1;

  653.         av_free_packet(&vst->pkt); //FIXME this should be output.

  654.         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)

  655.             return AVERROR(ENOMEM);

  656.         vst->videobufpos = 8*vst->slices + 1;

  657.         vst->cur_slice = 0;

  658.         vst->curpic_num = pic_num;

  659.         vst->pktpos = avio_tell(pb);

  660.     }

  661.     if(type == 2)

  662.         len = FFMIN(len, pos);

  663. 

  664.     if(++vst->cur_slice > vst->slices)

  665.         return 1;

  666.     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);

  667.     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);

  668.     if(vst->videobufpos + len > vst->videobufsize)

  669.         return 1;

  670.     if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)

  671.         return AVERROR(EIO);

  672.     vst->videobufpos += len;

  673.     rm->remaining_len-= len;

  674. 

  675.     if (type == 2 || vst->videobufpos == vst->videobufsize) {

  676.         vst->pkt.data[0] = vst->cur_slice-1;

  677.         *pkt= vst->pkt;

  678.         vst->pkt.data= NULL;

  679.         vst->pkt.size= 0;

  680.         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin

  681.             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,

  682.                 vst->videobufpos - 1 - 8*vst->slices);

  683.         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);

  684.         pkt->pts = AV_NOPTS_VALUE;

  685.         pkt->pos = vst->pktpos;

  686.         vst->slices = 0;

  687.         return 0;

  688.     }

  689. 

  690.     return 1;

  691. }

  692. 

  693. static inline void

  694. rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)

  695. {

  696.     uint8_t *ptr;

  697.     int j;

  698. 

  699.     if (st->codec->codec_id == AV_CODEC_ID_AC3) {

  700.         ptr = pkt->data;

  701.         for (j=0;j<pkt->size;j+=2) {

  702.             FFSWAP(int, ptr[0], ptr[1]);

  703.             ptr += 2;

  704.         }

  705.     }

  706. }

  707. 

  708. int

  709. ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,

  710.                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,

  711.                     int *seq, int flags, int64_t timestamp)

  712. {

  713.     RMDemuxContext *rm = s->priv_data;

  714. 

  715.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  716.         rm->current_stream= st->id;

  717.         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))

  718.             return -1; //got partial frame

  719.     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  720.         if ((ast->deint_id == DEINT_ID_GENR) ||

  721.             (ast->deint_id == DEINT_ID_INT4) ||

  722.             (ast->deint_id == DEINT_ID_SIPR)) {

  723.             int x;

  724.             int sps = ast->sub_packet_size;

  725.             int cfs = ast->coded_framesize;

  726.             int h = ast->sub_packet_h;

  727.             int y = ast->sub_packet_cnt;

  728.             int w = ast->audio_framesize;

  729. 

  730.             if (flags & 2)

  731.                 y = ast->sub_packet_cnt = 0;

  732.             if (!y)

  733.                 ast->audiotimestamp = timestamp;

  734. 

  735.             switch (ast->deint_id) {

  736.                 case DEINT_ID_INT4:

  737.                     for (x = 0; x < h/2; x++)

  738.                         avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);

  739.                     break;

  740.                 case DEINT_ID_GENR:

  741.                     for (x = 0; x < w/sps; x++)

  742.                         avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);

  743.                     break;

  744.                 case DEINT_ID_SIPR:

  745.                     avio_read(pb, ast->pkt.data + y * w, w);

  746.                     break;

  747.             }

  748. 

  749.             if (++(ast->sub_packet_cnt) < h)

  750.                 return -1;

  751.             if (ast->deint_id == DEINT_ID_SIPR)

  752.                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);

  753. 

  754.              ast->sub_packet_cnt = 0;

  755.              rm->audio_stream_num = st->index;

  756.              rm->audio_pkt_cnt = h * w / st->codec->block_align;

  757.         } else if ((ast->deint_id == DEINT_ID_VBRF) ||

  758.                    (ast->deint_id == DEINT_ID_VBRS)) {

  759.             int x;

  760.             rm->audio_stream_num = st->index;

  761.             ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;

  762.             if (ast->sub_packet_cnt) {

  763.                 for (x = 0; x < ast->sub_packet_cnt; x++)

  764.                     ast->sub_packet_lengths[x] = avio_rb16(pb);

  765.                 rm->audio_pkt_cnt = ast->sub_packet_cnt;

  766.                 ast->audiotimestamp = timestamp;

  767.             } else

  768.                 return -1;

  769.         } else {

  770.             av_get_packet(pb, pkt, len);

  771.             rm_ac3_swap_bytes(st, pkt);

  772.         }

  773.     } else

  774.         av_get_packet(pb, pkt, len);

  775. 

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

  777. 

  778. #if 0

  779.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  780.         if(st->codec->codec_id == AV_CODEC_ID_RV20){

  781.             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);

  782.             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);

  783. 

  784.             seq |= (timestamp&~0x3FFF);

  785.             if(seq - timestamp >  0x2000) seq -= 0x4000;

  786.             if(seq - timestamp < -0x2000) seq += 0x4000;

  787.         }

  788.     }

  789. #endif

  790. 

  791.     pkt->pts = timestamp;

  792.     if (flags & 2)

  793.         pkt->flags |= AV_PKT_FLAG_KEY;

  794. 

  795.     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;

  796. }

  797. 

  798. int

  799. ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,

  800.                       AVStream *st, RMStream *ast, AVPacket *pkt)

  801. {

  802.     RMDemuxContext *rm = s->priv_data;

  803. 

  804.     assert (rm->audio_pkt_cnt > 0);

  805. 

  806.     if (ast->deint_id == DEINT_ID_VBRF ||

  807.         ast->deint_id == DEINT_ID_VBRS)

  808.         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);

  809.     else {

  810.         av_new_packet(pkt, st->codec->block_align);

  811.         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this

  812.                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),

  813.                st->codec->block_align);

  814.     }

  815.     rm->audio_pkt_cnt--;

  816.     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {

  817.         ast->audiotimestamp = AV_NOPTS_VALUE;

  818.         pkt->flags = AV_PKT_FLAG_KEY;

  819.     } else

  820.         pkt->flags = 0;

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

  822. 

  823.     return rm->audio_pkt_cnt;

  824. }

  825. 

  826. static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)

  827. {

  828.     RMDemuxContext *rm = s->priv_data;

  829.     AVStream *st;

  830.     int i, len, res, seq = 1;

  831.     int64_t timestamp, pos;

  832.     int flags;

  833. 

  834.     for (;;) {

  835.         if (rm->audio_pkt_cnt) {

  836.             // If there are queued audio packet return them first

  837.             st = s->streams[rm->audio_stream_num];

  838.             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);

  839.             flags = 0;

  840.         } else {

  841.             if (rm->old_format) {

  842.                 RMStream *ast;

  843. 

  844.                 st = s->streams[0];

  845.                 ast = st->priv_data;

  846.                 timestamp = AV_NOPTS_VALUE;

  847.                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :

  848.                     ast->coded_framesize * ast->sub_packet_h / 2;

  849.                 flags = (seq++ == 1) ? 2 : 0;

  850.                 pos = avio_tell(s->pb);

  851.             } else {

  852.                 len=sync(s, &timestamp, &flags, &i, &pos);

  853.                 if (len > 0)

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

  855.             }

  856. 

  857.             if(len<0 || s->pb->eof_reached)

  858.                 return AVERROR(EIO);

  859. 

  860.             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,

  861.                                       &seq, flags, timestamp);

  862.             if((flags&2) && (seq&0x7F) == 1)

  863.                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);

  864.             if (res)

  865.                 continue;

  866.         }

  867. 

  868.         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))

  869.            || st->discard >= AVDISCARD_ALL){

  870.             av_free_packet(pkt);

  871.         } else

  872.             break;

  873.     }

  874. 

  875.     return 0;

  876. }

  877. 

  878. static int rm_read_close(AVFormatContext *s)

  879. {

  880.     int i;

  881. 

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

  883.         ff_rm_free_rmstream(s->streams[i]->priv_data);

  884. 

  885.     return 0;

  886. }

  887. 

  888. static int rm_probe(AVProbeData *p)

  889. {

  890.     /* check file header */

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

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

  893.          p->buf[4] == 0 && p->buf[5] == 0) ||

  894.         (p->buf[0] == '.' && p->buf[1] == 'r' &&

  895.          p->buf[2] == 'a' && p->buf[3] == 0xfd))

  896.         return AVPROBE_SCORE_MAX;

  897.     else

  898.         return 0;

  899. }

  900. 

  901. static int64_t rm_read_dts(AVFormatContext *s, int stream_index,

  902.                                int64_t *ppos, int64_t pos_limit)

  903. {

  904.     RMDemuxContext *rm = s->priv_data;

  905.     int64_t pos, dts;

  906.     int stream_index2, flags, len, h;

  907. 

  908.     pos = *ppos;

  909. 

  910.     if(rm->old_format)

  911.         return AV_NOPTS_VALUE;

  912. 

  913.     avio_seek(s->pb, pos, SEEK_SET);

  914.     rm->remaining_len=0;

  915.     for(;;){

  916.         int seq=1;

  917.         AVStream *st;

  918. 

  919.         len=sync(s, &dts, &flags, &stream_index2, &pos);

  920.         if(len<0)

  921.             return AV_NOPTS_VALUE;

  922. 

  923.         st = s->streams[stream_index2];

  924.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  925.             h= avio_r8(s->pb); len--;

  926.             if(!(h & 0x40)){

  927.                 seq = avio_r8(s->pb); len--;

  928.             }

  929.         }

  930. 

  931.         if((flags&2) && (seq&0x7F) == 1){

  932.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  933.                     flags, stream_index2, stream_index, dts, seq);

  934.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  935.             if(stream_index2 == stream_index)

  936.                 break;

  937.         }

  938. 

  939.         avio_skip(s->pb, len);

  940.     }

  941.     *ppos = pos;

  942.     return dts;

  943. }

  944. 

  945. AVInputFormat ff_rm_demuxer = {

  946.     .name           = "rm",

  947.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  948.     .priv_data_size = sizeof(RMDemuxContext),

  949.     .read_probe     = rm_probe,

  950.     .read_header    = rm_read_header,

  951.     .read_packet    = rm_read_packet,

  952.     .read_close     = rm_read_close,

  953.     .read_timestamp = rm_read_dts,

  954. };

  955. 

  956. AVInputFormat ff_rdt_demuxer = {

  957.     .name           = "rdt",

  958.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  959.     .priv_data_size = sizeof(RMDemuxContext),

  960.     .read_close     = rm_read_close,

  961.     .flags          = AVFMT_NOFILE,

  962. };