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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 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 <inttypes.h>

  23. 

  24. #include "libavutil/avassert.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavutil/channel_layout.h"

  27. #include "libavutil/internal.h"

  28. #include "libavutil/intreadwrite.h"

  29. #include "libavutil/dict.h"

  30. #include "avformat.h"

  31. #include "avio_internal.h"

  32. #include "internal.h"

  33. #include "rmsipr.h"

  34. #include "rm.h"

  35. 

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

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

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

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

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

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

  42. 

  43. struct RMStream {

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

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

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

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

  48.     int cur_slice, slices;

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

  50.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  57. };

  58. 

  59. typedef struct RMDemuxContext {

  60.     int nb_packets;

  61.     int old_format;

  62.     int current_stream;

  63.     int remaining_len;

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

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

  66. } RMDemuxContext;

  67. 

  68. static int rm_read_close(AVFormatContext *s);

  69. 

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

  71. {

  72.     int i;

  73.     char *q, r;

  74. 

  75.     q = buf;

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

  77.         r = avio_r8(pb);

  78.         if (i < buf_size - 1)

  79.             *q++ = r;

  80.     }

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

  82. }

  83. 

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

  85. {

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

  87. }

  88. 

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

  90. {

  91.     if (size >= 1<<24) {

  92.         av_log(avctx, AV_LOG_ERROR, "extradata size %u too large\n", size);

  93.         return -1;

  94.     }

  95.     if (ff_get_extradata(avctx, pb, size) < 0)

  96.         return AVERROR(ENOMEM);

  97.     return 0;

  98. }

  99. 

  100. static void rm_read_metadata(AVFormatContext *s, AVIOContext *pb, int wide)

  101. {

  102.     char buf[1024];

  103.     int i;

  104. 

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

  106.         int len = wide ? avio_rb16(pb) : avio_r8(pb);

  107.         get_strl(pb, buf, sizeof(buf), len);

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

  109.     }

  110. }

  111. 

  112. RMStream *ff_rm_alloc_rmstream (void)

  113. {

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

  115.     if (!rms)

  116.         return NULL;

  117.     rms->curpic_num = -1;

  118.     return rms;

  119. }

  120. 

  121. void ff_rm_free_rmstream (RMStream *rms)

  122. {

  123.     av_packet_unref(&rms->pkt);

  124. }

  125. 

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

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

  128. {

  129.     char buf[256];

  130.     uint32_t version;

  131.     int ret;

  132. 

  133.     /* ra type header */

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

  135.     if (version == 3) {

  136.         unsigned bytes_per_minute;

  137.         int header_size = avio_rb16(pb);

  138.         int64_t startpos = avio_tell(pb);

  139.         avio_skip(pb, 8);

  140.         bytes_per_minute = avio_rb16(pb);

  141.         avio_skip(pb, 4);

  142.         rm_read_metadata(s, pb, 0);

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

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

  145.             avio_r8(pb);

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

  147.         }

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

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

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

  151.         if (bytes_per_minute)

  152.             st->codec->bit_rate = 8LL * bytes_per_minute / 60;

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

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

  155.         st->codec->channel_layout = AV_CH_LAYOUT_MONO;

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

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

  158.         ast->deint_id = DEINT_ID_INT0;

  159.     } else {

  160.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  161.         int codecdata_length;

  162.         unsigned bytes_per_minute;

  163.         /* old version (4) */

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

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

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

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

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

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

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

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

  172.         bytes_per_minute = avio_rb32(pb);

  173.         if (version == 4) {

  174.             if (bytes_per_minute)

  175.                 st->codec->bit_rate = 8LL * bytes_per_minute / 60;

  176.         }

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

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

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

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

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

  182.         if (version == 5) {

  183.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  184.         }

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

  186.         avio_rb32(pb);

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

  188.         if (version == 5) {

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

  190.             avio_read(pb, buf, 4);

  191.             buf[4] = 0;

  192.         } else {

  193.             AV_WL32(buf, 0);

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

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

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

  197.         }

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

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

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

  201.                                                 st->codec->codec_tag);

  202. 

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

  204.         case AV_CODEC_ID_AC3:

  205.             st->need_parsing = AVSTREAM_PARSE_FULL;

  206.             break;

  207.         case AV_CODEC_ID_RA_288:

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

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

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

  211.             break;

  212.         case AV_CODEC_ID_COOK:

  213.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  214.         case AV_CODEC_ID_ATRAC3:

  215.         case AV_CODEC_ID_SIPR:

  216.             if (read_all) {

  217.                 codecdata_length = 0;

  218.             } else {

  219.                 avio_rb16(pb); avio_r8(pb);

  220.                 if (version == 5)

  221.                     avio_r8(pb);

  222.                 codecdata_length = avio_rb32(pb);

  223.                 if(codecdata_length + AV_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){

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

  225.                     return -1;

  226.                 }

  227.             }

  228. 

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

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

  231.                 if (flavor > 3) {

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

  233.                            flavor);

  234.                     return -1;

  235.                 }

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

  237.             } else {

  238.                 if(sub_packet_size <= 0){

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

  240.                     return -1;

  241.                 }

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

  243.             }

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

  245.                 return ret;

  246. 

  247.             break;

  248.         case AV_CODEC_ID_AAC:

  249.             avio_rb16(pb); avio_r8(pb);

  250.             if (version == 5)

  251.                 avio_r8(pb);

  252.             codecdata_length = avio_rb32(pb);

  253.             if(codecdata_length + AV_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){

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

  255.                 return -1;

  256.             }

  257.             if (codecdata_length >= 1) {

  258.                 avio_r8(pb);

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

  260.                     return ret;

  261.             }

  262.             break;

  263.         }

  264.         switch (ast->deint_id) {

  265.         case DEINT_ID_INT4:

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

  267.                 sub_packet_h <= 1 ||

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

  269.                 return AVERROR_INVALIDDATA;

  270.             if (ast->coded_framesize * sub_packet_h != 2*ast->audio_framesize) {

  271.                 avpriv_request_sample(s, "mismatching interleaver parameters");

  272.                 return AVERROR_INVALIDDATA;

  273.             }

  274.             break;

  275.         case DEINT_ID_GENR:

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

  277.                 ast->sub_packet_size > ast->audio_framesize)

  278.                 return AVERROR_INVALIDDATA;

  279.             if (ast->audio_framesize % ast->sub_packet_size)

  280.                 return AVERROR_INVALIDDATA;

  281.             break;

  282.         case DEINT_ID_SIPR:

  283.         case DEINT_ID_INT0:

  284.         case DEINT_ID_VBRS:

  285.         case DEINT_ID_VBRF:

  286.             break;

  287.         default:

  288.             av_log(s, AV_LOG_ERROR ,"Unknown interleaver %"PRIX32"\n", ast->deint_id);

  289.             return AVERROR_INVALIDDATA;

  290.         }

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

  292.             ast->deint_id == DEINT_ID_GENR ||

  293.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  297.                 return AVERROR_INVALIDDATA;

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

  299.                 return AVERROR(ENOMEM);

  300.         }

  301. 

  302.         if (read_all) {

  303.             avio_r8(pb);

  304.             avio_r8(pb);

  305.             avio_r8(pb);

  306.             rm_read_metadata(s, pb, 0);

  307.         }

  308.     }

  309.     return 0;

  310. }

  311. 

  312. int ff_rm_read_mdpr_codecdata(AVFormatContext *s, AVIOContext *pb,

  313.                               AVStream *st, RMStream *rst,

  314.                               unsigned int codec_data_size, const uint8_t *mime)

  315. {

  316.     unsigned int v;

  317.     int size;

  318.     int64_t codec_pos;

  319.     int ret;

  320. 

  321.     if (codec_data_size > INT_MAX)

  322.         return AVERROR_INVALIDDATA;

  323.     if (codec_data_size == 0)

  324.         return 0;

  325. 

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

  327.     codec_pos = avio_tell(pb);

  328.     v = avio_rb32(pb);

  329. 

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

  331.         /* ra type header */

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

  333.             return -1;

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

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

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

  337.             return ret;

  338. 

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

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

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

  342.                                                 st->codec->codec_tag);

  343.     } else if(mime && !strcmp(mime, "logical-fileinfo")){

  344.         int stream_count, rule_count, property_count, i;

  345.         ff_free_stream(s, st);

  346.         if (avio_rb16(pb) != 0) {

  347.             av_log(s, AV_LOG_WARNING, "Unsupported version\n");

  348.             goto skip;

  349.         }

  350.         stream_count = avio_rb16(pb);

  351.         avio_skip(pb, 6*stream_count);

  352.         rule_count = avio_rb16(pb);

  353.         avio_skip(pb, 2*rule_count);

  354.         property_count = avio_rb16(pb);

  355.         for(i=0; i<property_count; i++){

  356.             uint8_t name[128], val[128];

  357.             avio_rb32(pb);

  358.             if (avio_rb16(pb) != 0) {

  359.                 av_log(s, AV_LOG_WARNING, "Unsupported Name value property version\n");

  360.                 goto skip; //FIXME skip just this one

  361.             }

  362.             get_str8(pb, name, sizeof(name));

  363.             switch(avio_rb32(pb)) {

  364.             case 2: get_strl(pb, val, sizeof(val), avio_rb16(pb));

  365.                 av_dict_set(&s->metadata, name, val, 0);

  366.                 break;

  367.             default: avio_skip(pb, avio_rb16(pb));

  368.             }

  369.         }

  370.     } else {

  371.         int fps;

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

  373.         fail1:

  374.             av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);

  375.             goto skip;

  376.         }

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

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

  379.                                                st->codec->codec_tag);

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

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

  382.             goto fail1;

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

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

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

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

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

  388.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  389.         fps = avio_rb32(pb);

  390. 

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

  392.             return ret;

  393. 

  394.         if (fps > 0) {

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

  396.                       0x10000, fps, (1 << 30) - 1);

  397. #if FF_API_R_FRAME_RATE

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

  399. #endif

  400.         } else if (s->error_recognition & AV_EF_EXPLODE) {

  401.             av_log(s, AV_LOG_ERROR, "Invalid framerate\n");

  402.             return AVERROR_INVALIDDATA;

  403.         }

  404.     }

  405. 

  406. skip:

  407.     /* skip codec info */

  408.     size = avio_tell(pb) - codec_pos;

  409.     if (codec_data_size >= size) {

  410.         avio_skip(pb, codec_data_size - size);

  411.     } else {

  412.         av_log(s, AV_LOG_WARNING, "codec_data_size %u < size %d\n", codec_data_size, size);

  413.     }

  414. 

  415.     return 0;

  416. }

  417. 

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

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

  420. static int rm_read_index(AVFormatContext *s)

  421. {

  422.     AVIOContext *pb = s->pb;

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

  424.     AVStream *st;

  425. 

  426.     do {

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

  428.             return -1;

  429.         size     = avio_rb32(pb);

  430.         if (size < 20)

  431.             return -1;

  432.         avio_skip(pb, 2);

  433.         n_pkts   = avio_rb32(pb);

  434.         str_id   = avio_rb16(pb);

  435.         next_off = avio_rb32(pb);

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

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

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

  439.                 break;

  440.             }

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

  442.             av_log(s, AV_LOG_ERROR,

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

  444.                    str_id, avio_tell(pb));

  445.             goto skip;

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

  447.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  452.             goto skip;

  453.         }

  454. 

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

  456.             avio_skip(pb, 2);

  457.             pts = avio_rb32(pb);

  458.             pos = avio_rb32(pb);

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

  460. 

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

  462.         }

  463. 

  464. skip:

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

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

  467.             av_log(s, AV_LOG_ERROR,

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

  469.             return -1;

  470.         }

  471.     } while (next_off);

  472. 

  473.     return 0;

  474. }

  475. 

  476. static int rm_read_header_old(AVFormatContext *s)

  477. {

  478.     RMDemuxContext *rm = s->priv_data;

  479.     AVStream *st;

  480. 

  481.     rm->old_format = 1;

  482.     st = avformat_new_stream(s, NULL);

  483.     if (!st)

  484.         return -1;

  485.     st->priv_data = ff_rm_alloc_rmstream();

  486.     if (!st->priv_data)

  487.         return AVERROR(ENOMEM);

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

  489. }

  490. 

  491. static int rm_read_header(AVFormatContext *s)

  492. {

  493.     RMDemuxContext *rm = s->priv_data;

  494.     AVStream *st;

  495.     AVIOContext *pb = s->pb;

  496.     unsigned int tag;

  497.     int tag_size;

  498.     unsigned int start_time, duration;

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

  500.     char buf[128], mime[128];

  501.     int flags = 0;

  502.     int ret = -1;

  503.     unsigned size, v;

  504.     int64_t codec_pos;

  505. 

  506.     tag = avio_rl32(pb);

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

  508.         /* very old .ra format */

  509.         return rm_read_header_old(s);

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

  511.         return AVERROR(EIO);

  512.     }

  513. 

  514.     tag_size = avio_rb32(pb);

  515.     avio_skip(pb, tag_size - 8);

  516. 

  517.     for(;;) {

  518.         if (avio_feof(pb))

  519.             goto fail;

  520.         tag = avio_rl32(pb);

  521.         tag_size = avio_rb32(pb);

  522.         avio_rb16(pb);

  523.         av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c (%08x) size=%d\n",

  524.                 (tag      ) & 0xff,

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

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

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

  528.                 tag,

  529.                 tag_size);

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

  531.             goto fail;

  532.         switch(tag) {

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

  534.             /* file header */

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

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

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

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

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

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

  541.             s->duration = av_rescale(duration, AV_TIME_BASE, 1000);

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

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

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

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

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

  547.             break;

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

  549.             rm_read_metadata(s, pb, 1);

  550.             break;

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

  552.             st = avformat_new_stream(s, NULL);

  553.             if (!st) {

  554.                 ret = AVERROR(ENOMEM);

  555.                 goto fail;

  556.             }

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

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

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

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

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

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

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

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

  565.             st->start_time = start_time;

  566.             st->duration = duration;

  567.             if(duration>0)

  568.                 s->duration = AV_NOPTS_VALUE;

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

  570.             get_str8(pb, mime, sizeof(mime)); /* mimetype */

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

  572.             st->priv_data = ff_rm_alloc_rmstream();

  573.             if (!st->priv_data)

  574.                 return AVERROR(ENOMEM);

  575. 

  576.             size = avio_rb32(pb);

  577.             codec_pos = avio_tell(pb);

  578. 

  579.             ffio_ensure_seekback(pb, 4);

  580.             v = avio_rb32(pb);

  581.             if (v == MKBETAG('M', 'L', 'T', 'I')) {

  582.                 int number_of_streams = avio_rb16(pb);

  583.                 int number_of_mdpr;

  584.                 int i;

  585.                 unsigned size2;

  586.                 for (i = 0; i<number_of_streams; i++)

  587.                     avio_rb16(pb);

  588.                 number_of_mdpr = avio_rb16(pb);

  589.                 if (number_of_mdpr != 1) {

  590.                     avpriv_request_sample(s, "MLTI with multiple (%d) MDPR", number_of_mdpr);

  591.                 }

  592.                 for (i = 0; i < number_of_mdpr; i++) {

  593.                     AVStream *st2;

  594.                     if (i > 0) {

  595.                         st2 = avformat_new_stream(s, NULL);

  596.                         if (!st2) {

  597.                             ret = AVERROR(ENOMEM);

  598.                             goto fail;

  599.                         }

  600.                         st2->id = st->id + (i<<16);

  601.                         st2->codec->bit_rate = st->codec->bit_rate;

  602.                         st2->start_time = st->start_time;

  603.                         st2->duration   = st->duration;

  604.                         st2->codec->codec_type = AVMEDIA_TYPE_DATA;

  605.                         st2->priv_data = ff_rm_alloc_rmstream();

  606.                         if (!st2->priv_data)

  607.                             return AVERROR(ENOMEM);

  608.                     } else

  609.                         st2 = st;

  610. 

  611.                     size2 = avio_rb32(pb);

  612.                     if (ff_rm_read_mdpr_codecdata(s, s->pb, st2, st2->priv_data,

  613.                                                   size2, mime) < 0)

  614.                         goto fail;

  615.                 }

  616.                 avio_seek(pb, codec_pos + size, SEEK_SET);

  617.             } else {

  618.                 avio_skip(pb, -4);

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

  620.                                               size, mime) < 0)

  621.                     goto fail;

  622.             }

  623. 

  624.             break;

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

  626.             goto header_end;

  627.         default:

  628.             /* unknown tag: skip it */

  629.             avio_skip(pb, tag_size - 10);

  630.             break;

  631.         }

  632.     }

  633.  header_end:

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

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

  636.         rm->nb_packets = 3600 * 25;

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

  638. 

  639.     if (!data_off)

  640.         data_off = avio_tell(pb) - 18;

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

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

  643.         rm_read_index(s);

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

  645.     }

  646. 

  647.     return 0;

  648. 

  649. fail:

  650.     rm_read_close(s);

  651.     return ret;

  652. }

  653. 

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

  655. {

  656.     int n, n1;

  657. 

  658.     n = avio_rb16(pb);

  659.     (*len)-=2;

  660.     n &= 0x7FFF;

  661.     if (n >= 0x4000) {

  662.         return n - 0x4000;

  663.     } else {

  664.         n1 = avio_rb16(pb);

  665.         (*len)-=2;

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

  667.     }

  668. }

  669. 

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

  671. #define RAW_PACKET_SIZE 1000

  672. 

  673. static int rm_sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){

  674.     RMDemuxContext *rm = s->priv_data;

  675.     AVIOContext *pb = s->pb;

  676.     AVStream *st;

  677.     uint32_t state=0xFFFFFFFF;

  678. 

  679.     while(!avio_feof(pb)){

  680.         int len, num, i;

  681.         int mlti_id;

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

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

  684.             num= rm->current_stream;

  685.             mlti_id = 0;

  686.             len= rm->remaining_len;

  687.             *timestamp = AV_NOPTS_VALUE;

  688.             *flags= 0;

  689.         }else{

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

  691. 

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

  693.                 int n_pkts, expected_len;

  694.                 len = avio_rb32(pb);

  695.                 avio_skip(pb, 2);

  696.                 n_pkts = avio_rb32(pb);

  697.                 expected_len = 20 + n_pkts * 14;

  698.                 if (len == 20)

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

  700.                     len = expected_len;

  701.                 else if (len != expected_len)

  702.                     av_log(s, AV_LOG_WARNING,

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

  704.                            len, n_pkts, expected_len);

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

  706.                 if(len<0)

  707.                     continue;

  708.                 goto skip;

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

  710.                 av_log(s, AV_LOG_WARNING,

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

  712.             }

  713. 

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

  715.                 continue;

  716.             len=state - 12;

  717.             state= 0xFFFFFFFF;

  718. 

  719.             num = avio_rb16(pb);

  720.             *timestamp = avio_rb32(pb);

  721.             mlti_id = (avio_r8(pb)>>1)-1<<16;

  722.             mlti_id = FFMAX(mlti_id, 0);

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

  724.         }

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

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

  727.             if (mlti_id + num == st->id)

  728.                 break;

  729.         }

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

  731. skip:

  732.             /* skip packet if unknown number */

  733.             avio_skip(pb, len);

  734.             rm->remaining_len = 0;

  735.             continue;

  736.         }

  737.         *stream_index= i;

  738. 

  739.         return len;

  740.     }

  741.     return -1;

  742. }

  743. 

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

  745.                                    RMDemuxContext *rm, RMStream *vst,

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

  747.                                    int64_t *timestamp)

  748. {

  749.     int hdr;

  750.     int seq = 0, pic_num = 0, len2 = 0, pos = 0; //init to silence compiler warning

  751.     int type;

  752.     int ret;

  753. 

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

  755.     type = hdr >> 6;

  756. 

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

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

  759.     }

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

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

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

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

  764.     }

  765.     if(len<0) {

  766.         av_log(s, AV_LOG_ERROR, "Insufficient data\n");

  767.         return -1;

  768.     }

  769.     rm->remaining_len = len;

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

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

  772.             len= len2;

  773.             *timestamp = pos;

  774.         }

  775.         if(rm->remaining_len < len) {

  776.             av_log(s, AV_LOG_ERROR, "Insufficient remaining len\n");

  777.             return -1;

  778.         }

  779.         rm->remaining_len -= len;

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

  781.             return AVERROR(EIO);

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

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

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

  785.         if ((ret = avio_read(pb, pkt->data + 9, len)) != len) {

  786.             av_free_packet(pkt);

  787.             av_log(s, AV_LOG_ERROR, "Failed to read %d bytes\n", len);

  788.             return ret < 0 ? ret : AVERROR(EIO);

  789.         }

  790.         return 0;

  791.     }

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

  793. 

  794.     *pseq = seq;

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

  796.         if (len2 > ffio_limit(pb, len2)) {

  797.             av_log(s, AV_LOG_ERROR, "Impossibly sized packet\n");

  798.             return AVERROR_INVALIDDATA;

  799.         }

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

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

  802.         av_packet_unref(&vst->pkt); //FIXME this should be output.

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

  804.             return AVERROR(ENOMEM);

  805.         memset(vst->pkt.data, 0, vst->pkt.size);

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

  807.         vst->cur_slice = 0;

  808.         vst->curpic_num = pic_num;

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

  810.     }

  811.     if(type == 2)

  812.         len = FFMIN(len, pos);

  813. 

  814.     if(++vst->cur_slice > vst->slices) {

  815.         av_log(s, AV_LOG_ERROR, "cur slice %d, too large\n", vst->cur_slice);

  816.         return 1;

  817.     }

  818.     if(!vst->pkt.data)

  819.         return AVERROR(ENOMEM);

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

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

  822.     if(vst->videobufpos + len > vst->videobufsize) {

  823.         av_log(s, AV_LOG_ERROR, "outside videobufsize\n");

  824.         return 1;

  825.     }

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

  827.         return AVERROR(EIO);

  828.     vst->videobufpos += len;

  829.     rm->remaining_len-= len;

  830. 

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

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

  833.         *pkt= vst->pkt;

  834.         vst->pkt.data= NULL;

  835.         vst->pkt.size= 0;

  836.         vst->pkt.buf = NULL;

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

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

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

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

  841.         pkt->pts = AV_NOPTS_VALUE;

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

  843.         vst->slices = 0;

  844.         return 0;

  845.     }

  846. 

  847.     return 1;

  848. }

  849. 

  850. static inline void

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

  852. {

  853.     uint8_t *ptr;

  854.     int j;

  855. 

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

  857.         ptr = pkt->data;

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

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

  860.             ptr += 2;

  861.         }

  862.     }

  863. }

  864. 

  865. static int readfull(AVFormatContext *s, AVIOContext *pb, uint8_t *dst, int n) {

  866.     int ret = avio_read(pb, dst, n);

  867.     if (ret != n) {

  868.         if (ret >= 0) memset(dst + ret, 0, n - ret);

  869.         else          memset(dst      , 0, n);

  870.         av_log(s, AV_LOG_ERROR, "Failed to fully read block\n");

  871.     }

  872.     return ret;

  873. }

  874. 

  875. int

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

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

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

  879. {

  880.     RMDemuxContext *rm = s->priv_data;

  881.     int ret;

  882. 

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

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

  885.         ret = rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp);

  886.         if(ret)

  887.             return ret < 0 ? ret : -1; //got partial frame or error

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

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

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

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

  892.             int x;

  893.             int sps = ast->sub_packet_size;

  894.             int cfs = ast->coded_framesize;

  895.             int h = ast->sub_packet_h;

  896.             int y = ast->sub_packet_cnt;

  897.             int w = ast->audio_framesize;

  898. 

  899.             if (flags & 2)

  900.                 y = ast->sub_packet_cnt = 0;

  901.             if (!y)

  902.                 ast->audiotimestamp = timestamp;

  903. 

  904.             switch (ast->deint_id) {

  905.                 case DEINT_ID_INT4:

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

  907.                         readfull(s, pb, ast->pkt.data+x*2*w+y*cfs, cfs);

  908.                     break;

  909.                 case DEINT_ID_GENR:

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

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

  912.                     break;

  913.                 case DEINT_ID_SIPR:

  914.                     readfull(s, pb, ast->pkt.data + y * w, w);

  915.                     break;

  916.             }

  917. 

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

  919.                 return -1;

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

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

  922. 

  923.              ast->sub_packet_cnt = 0;

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

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

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

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

  928.             int x;

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

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

  931.             if (ast->sub_packet_cnt) {

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

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

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

  935.                 ast->audiotimestamp = timestamp;

  936.             } else

  937.                 return -1;

  938.         } else {

  939.             if ((ret = av_get_packet(pb, pkt, len)) < 0)

  940.                 return ret;

  941.             rm_ac3_swap_bytes(st, pkt);

  942.         }

  943.     } else {

  944.         if ((ret = av_get_packet(pb, pkt, len)) < 0)

  945.             return ret;

  946.     }

  947. 

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

  949. 

  950. #if 0

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

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

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

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

  955. 

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

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

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

  959.         }

  960.     }

  961. #endif

  962. 

  963.     pkt->pts = timestamp;

  964.     if (flags & 2)

  965.         pkt->flags |= AV_PKT_FLAG_KEY;

  966. 

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

  968. }

  969. 

  970. int

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

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

  973. {

  974.     RMDemuxContext *rm = s->priv_data;

  975. 

  976.     av_assert0 (rm->audio_pkt_cnt > 0);

  977. 

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

  979.         ast->deint_id == DEINT_ID_VBRS) {

  980.         int ret = av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);

  981.         if (ret < 0)

  982.             return ret;

  983.     } else {

  984.         int ret = av_new_packet(pkt, st->codec->block_align);

  985.         if (ret < 0)

  986.             return ret;

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

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

  989.                st->codec->block_align);

  990.     }

  991.     rm->audio_pkt_cnt--;

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

  993.         ast->audiotimestamp = AV_NOPTS_VALUE;

  994.         pkt->flags = AV_PKT_FLAG_KEY;

  995.     } else

  996.         pkt->flags = 0;

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

  998. 

  999.     return rm->audio_pkt_cnt;

  1000. }

  1001. 

  1002. static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)

  1003. {

  1004.     RMDemuxContext *rm = s->priv_data;

  1005.     AVStream *st = NULL; // init to silence compiler warning

  1006.     int i, len, res, seq = 1;

  1007.     int64_t timestamp, pos;

  1008.     int flags;

  1009. 

  1010.     for (;;) {

  1011.         if (rm->audio_pkt_cnt) {

  1012.             // If there are queued audio packet return them first

  1013.             st = s->streams[rm->audio_stream_num];

  1014.             res = ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);

  1015.             if(res < 0)

  1016.                 return res;

  1017.             flags = 0;

  1018.         } else {

  1019.             if (rm->old_format) {

  1020.                 RMStream *ast;

  1021. 

  1022.                 st = s->streams[0];

  1023.                 ast = st->priv_data;

  1024.                 timestamp = AV_NOPTS_VALUE;

  1025.                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :

  1026.                     ast->coded_framesize * ast->sub_packet_h / 2;

  1027.                 flags = (seq++ == 1) ? 2 : 0;

  1028.                 pos = avio_tell(s->pb);

  1029.             } else {

  1030.                 len = rm_sync(s, &timestamp, &flags, &i, &pos);

  1031.                 if (len > 0)

  1032.                     st = s->streams[i];

  1033.             }

  1034. 

  1035.             if (len <= 0 || avio_feof(s->pb))

  1036.                 return AVERROR(EIO);

  1037. 

  1038.             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,

  1039.                                       &seq, flags, timestamp);

  1040.             if (res < -1)

  1041.                 return res;

  1042.             if((flags&2) && (seq&0x7F) == 1)

  1043.                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);

  1044.             if (res)

  1045.                 continue;

  1046.         }

  1047. 

  1048.         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))

  1049.            || st->discard >= AVDISCARD_ALL){

  1050.             av_packet_unref(pkt);

  1051.         } else

  1052.             break;

  1053.     }

  1054. 

  1055.     return 0;

  1056. }

  1057. 

  1058. static int rm_read_close(AVFormatContext *s)

  1059. {

  1060.     int i;

  1061. 

  1062.     for (i=0;i<s->nb_streams;i++)

  1063.         ff_rm_free_rmstream(s->streams[i]->priv_data);

  1064. 

  1065.     return 0;

  1066. }

  1067. 

  1068. static int rm_probe(AVProbeData *p)

  1069. {

  1070.     /* check file header */

  1071.     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&

  1072.          p->buf[2] == 'M' && p->buf[3] == 'F' &&

  1073.          p->buf[4] == 0 && p->buf[5] == 0) ||

  1074.         (p->buf[0] == '.' && p->buf[1] == 'r' &&

  1075.          p->buf[2] == 'a' && p->buf[3] == 0xfd))

  1076.         return AVPROBE_SCORE_MAX;

  1077.     else

  1078.         return 0;

  1079. }

  1080. 

  1081. static int64_t rm_read_dts(AVFormatContext *s, int stream_index,

  1082.                                int64_t *ppos, int64_t pos_limit)

  1083. {

  1084.     RMDemuxContext *rm = s->priv_data;

  1085.     int64_t pos, dts;

  1086.     int stream_index2, flags, len, h;

  1087. 

  1088.     pos = *ppos;

  1089. 

  1090.     if(rm->old_format)

  1091.         return AV_NOPTS_VALUE;

  1092. 

  1093.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1094.         return AV_NOPTS_VALUE;

  1095. 

  1096.     rm->remaining_len=0;

  1097.     for(;;){

  1098.         int seq=1;

  1099.         AVStream *st;

  1100. 

  1101.         len = rm_sync(s, &dts, &flags, &stream_index2, &pos);

  1102.         if(len<0)

  1103.             return AV_NOPTS_VALUE;

  1104. 

  1105.         st = s->streams[stream_index2];

  1106.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1107.             h= avio_r8(s->pb); len--;

  1108.             if(!(h & 0x40)){

  1109.                 seq = avio_r8(s->pb); len--;

  1110.             }

  1111.         }

  1112. 

  1113.         if((flags&2) && (seq&0x7F) == 1){

  1114.             av_log(s, AV_LOG_TRACE, "%d %d-%d %"PRId64" %d\n",

  1115.                     flags, stream_index2, stream_index, dts, seq);

  1116.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  1117.             if(stream_index2 == stream_index)

  1118.                 break;

  1119.         }

  1120. 

  1121.         avio_skip(s->pb, len);

  1122.     }

  1123.     *ppos = pos;

  1124.     return dts;

  1125. }

  1126. 

  1127. static int rm_read_seek(AVFormatContext *s, int stream_index,

  1128.                         int64_t pts, int flags)

  1129. {

  1130.     RMDemuxContext *rm = s->priv_data;

  1131. 

  1132.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1133.         return -1;

  1134.     rm->audio_pkt_cnt = 0;

  1135.     return 0;

  1136. }

  1137. 

  1138. 

  1139. AVInputFormat ff_rm_demuxer = {

  1140.     .name           = "rm",

  1141.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1142.     .priv_data_size = sizeof(RMDemuxContext),

  1143.     .read_probe     = rm_probe,

  1144.     .read_header    = rm_read_header,

  1145.     .read_packet    = rm_read_packet,

  1146.     .read_close     = rm_read_close,

  1147.     .read_timestamp = rm_read_dts,

  1148.     .read_seek      = rm_read_seek,

  1149. };

  1150. 

  1151. AVInputFormat ff_rdt_demuxer = {

  1152.     .name           = "rdt",

  1153.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1154.     .priv_data_size = sizeof(RMDemuxContext),

  1155.     .read_close     = rm_read_close,

  1156.     .flags          = AVFMT_NOFILE,

  1157. };