falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70007 Commits
32 Branches
850MB
Tree: c0e3b46118
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'c0e3b46118'
${ noResults }
FFmpeg/libavformat/rmdec.c

1124 lines
37KB
Raw Blame History 

  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_free_packet(&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 + FF_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 + FF_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. 

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

  325.     codec_pos = avio_tell(pb);

  326.     v = avio_rb32(pb);

  327. 

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

  329.         int number_of_streams = avio_rb16(pb);

  330.         int number_of_mdpr;

  331.         int i;

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

  333.             avio_rb16(pb);

  334.         number_of_mdpr = avio_rb16(pb);

  335.         if (number_of_mdpr != 1) {

  336.             avpriv_request_sample(s, "MLTI with multiple MDPR");

  337.         }

  338.         avio_rb32(pb);

  339.         v = avio_rb32(pb);

  340.     }

  341. 

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

  343.         /* ra type header */

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

  345.             return -1;

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

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

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

  349.             return ret;

  350. 

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

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

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

  354.                                                 st->codec->codec_tag);

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

  356.         int stream_count, rule_count, property_count, i;

  357.         ff_free_stream(s, st);

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

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

  360.             goto skip;

  361.         }

  362.         stream_count = avio_rb16(pb);

  363.         avio_skip(pb, 6*stream_count);

  364.         rule_count = avio_rb16(pb);

  365.         avio_skip(pb, 2*rule_count);

  366.         property_count = avio_rb16(pb);

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

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

  369.             avio_rb32(pb);

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

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

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

  373.             }

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

  375.             switch(avio_rb32(pb)) {

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

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

  378.                 break;

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

  380.             }

  381.         }

  382.     } else {

  383.         int fps;

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

  385.         fail1:

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

  387.             goto skip;

  388.         }

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

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

  391.                                                st->codec->codec_tag);

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

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

  394.             goto fail1;

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

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

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

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

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

  400.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  401.         fps = avio_rb32(pb);

  402. 

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

  404.             return ret;

  405. 

  406.         if (fps > 0) {

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

  408.                       0x10000, fps, (1 << 30) - 1);

  409. #if FF_API_R_FRAME_RATE

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

  411. #endif

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

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

  414.             return AVERROR_INVALIDDATA;

  415.         }

  416.     }

  417. 

  418. skip:

  419.     /* skip codec info */

  420.     size = avio_tell(pb) - codec_pos;

  421.     if (codec_data_size >= size) {

  422.         avio_skip(pb, codec_data_size - size);

  423.     } else {

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

  425.     }

  426. 

  427.     return 0;

  428. }

  429. 

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

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

  432. static int rm_read_index(AVFormatContext *s)

  433. {

  434.     AVIOContext *pb = s->pb;

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

  436.     AVStream *st;

  437. 

  438.     do {

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

  440.             return -1;

  441.         size     = avio_rb32(pb);

  442.         if (size < 20)

  443.             return -1;

  444.         avio_skip(pb, 2);

  445.         n_pkts   = avio_rb32(pb);

  446.         str_id   = avio_rb16(pb);

  447.         next_off = avio_rb32(pb);

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

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

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

  451.                 break;

  452.             }

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

  454.             av_log(s, AV_LOG_ERROR,

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

  456.                    str_id, avio_tell(pb));

  457.             goto skip;

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

  459.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  464.             goto skip;

  465.         }

  466. 

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

  468.             avio_skip(pb, 2);

  469.             pts = avio_rb32(pb);

  470.             pos = avio_rb32(pb);

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

  472. 

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

  474.         }

  475. 

  476. skip:

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

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

  479.             av_log(s, AV_LOG_ERROR,

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

  481.             return -1;

  482.         }

  483.     } while (next_off);

  484. 

  485.     return 0;

  486. }

  487. 

  488. static int rm_read_header_old(AVFormatContext *s)

  489. {

  490.     RMDemuxContext *rm = s->priv_data;

  491.     AVStream *st;

  492. 

  493.     rm->old_format = 1;

  494.     st = avformat_new_stream(s, NULL);

  495.     if (!st)

  496.         return -1;

  497.     st->priv_data = ff_rm_alloc_rmstream();

  498.     if (!st->priv_data)

  499.         return AVERROR(ENOMEM);

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

  501. }

  502. 

  503. static int rm_read_header(AVFormatContext *s)

  504. {

  505.     RMDemuxContext *rm = s->priv_data;

  506.     AVStream *st;

  507.     AVIOContext *pb = s->pb;

  508.     unsigned int tag;

  509.     int tag_size;

  510.     unsigned int start_time, duration;

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

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

  513.     int flags = 0;

  514.     int ret = -1;

  515. 

  516.     tag = avio_rl32(pb);

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

  518.         /* very old .ra format */

  519.         return rm_read_header_old(s);

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

  521.         return AVERROR(EIO);

  522.     }

  523. 

  524.     tag_size = avio_rb32(pb);

  525.     avio_skip(pb, tag_size - 8);

  526. 

  527.     for(;;) {

  528.         if (avio_feof(pb))

  529.             goto fail;

  530.         tag = avio_rl32(pb);

  531.         tag_size = avio_rb32(pb);

  532.         avio_rb16(pb);

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

  534.                 (tag      ) & 0xff,

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

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

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

  538.                 tag,

  539.                 tag_size);

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

  541.             goto fail;

  542.         switch(tag) {

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

  544.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  557.             break;

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

  559.             rm_read_metadata(s, pb, 1);

  560.             break;

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

  562.             st = avformat_new_stream(s, NULL);

  563.             if (!st) {

  564.                 ret = AVERROR(ENOMEM);

  565.                 goto fail;

  566.             }

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

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

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

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

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

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

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

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

  575.             st->start_time = start_time;

  576.             st->duration = duration;

  577.             if(duration>0)

  578.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  582.             st->priv_data = ff_rm_alloc_rmstream();

  583.             if (!st->priv_data)

  584.                 return AVERROR(ENOMEM);

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

  586.                                           avio_rb32(pb), mime) < 0)

  587.                 goto fail;

  588.             break;

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

  590.             goto header_end;

  591.         default:

  592.             /* unknown tag: skip it */

  593.             avio_skip(pb, tag_size - 10);

  594.             break;

  595.         }

  596.     }

  597.  header_end:

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

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

  600.         rm->nb_packets = 3600 * 25;

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

  602. 

  603.     if (!data_off)

  604.         data_off = avio_tell(pb) - 18;

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

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

  607.         rm_read_index(s);

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

  609.     }

  610. 

  611.     return 0;

  612. 

  613. fail:

  614.     rm_read_close(s);

  615.     return ret;

  616. }

  617. 

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

  619. {

  620.     int n, n1;

  621. 

  622.     n = avio_rb16(pb);

  623.     (*len)-=2;

  624.     n &= 0x7FFF;

  625.     if (n >= 0x4000) {

  626.         return n - 0x4000;

  627.     } else {

  628.         n1 = avio_rb16(pb);

  629.         (*len)-=2;

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

  631.     }

  632. }

  633. 

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

  635. #define RAW_PACKET_SIZE 1000

  636. 

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

  638.     RMDemuxContext *rm = s->priv_data;

  639.     AVIOContext *pb = s->pb;

  640.     AVStream *st;

  641.     uint32_t state=0xFFFFFFFF;

  642. 

  643.     while(!avio_feof(pb)){

  644.         int len, num, i;

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

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

  647.             num= rm->current_stream;

  648.             len= rm->remaining_len;

  649.             *timestamp = AV_NOPTS_VALUE;

  650.             *flags= 0;

  651.         }else{

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

  653. 

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

  655.                 int n_pkts, expected_len;

  656.                 len = avio_rb32(pb);

  657.                 avio_skip(pb, 2);

  658.                 n_pkts = avio_rb32(pb);

  659.                 expected_len = 20 + n_pkts * 14;

  660.                 if (len == 20)

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

  662.                     len = expected_len;

  663.                 else if (len != expected_len)

  664.                     av_log(s, AV_LOG_WARNING,

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

  666.                            len, n_pkts, expected_len);

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

  668.                 if(len<0)

  669.                     continue;

  670.                 goto skip;

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

  672.                 av_log(s, AV_LOG_WARNING,

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

  674.             }

  675. 

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

  677.                 continue;

  678.             len=state - 12;

  679.             state= 0xFFFFFFFF;

  680. 

  681.             num = avio_rb16(pb);

  682.             *timestamp = avio_rb32(pb);

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

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

  685.         }

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

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

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

  689.                 break;

  690.         }

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

  692. skip:

  693.             /* skip packet if unknown number */

  694.             avio_skip(pb, len);

  695.             rm->remaining_len = 0;

  696.             continue;

  697.         }

  698.         *stream_index= i;

  699. 

  700.         return len;

  701.     }

  702.     return -1;

  703. }

  704. 

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

  706.                                    RMDemuxContext *rm, RMStream *vst,

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

  708.                                    int64_t *timestamp)

  709. {

  710.     int hdr;

  711.     int seq = 0, pic_num = 0, len2 = 0, pos = 0; //init to silcense compiler warning

  712.     int type;

  713.     int ret;

  714. 

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

  716.     type = hdr >> 6;

  717. 

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

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

  720.     }

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

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

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

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

  725.     }

  726.     if(len<0) {

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

  728.         return -1;

  729.     }

  730.     rm->remaining_len = len;

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

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

  733.             len= len2;

  734.             *timestamp = pos;

  735.         }

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

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

  738.             return -1;

  739.         }

  740.         rm->remaining_len -= len;

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

  742.             return AVERROR(EIO);

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

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

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

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

  747.             av_free_packet(pkt);

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

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

  750.         }

  751.         return 0;

  752.     }

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

  754. 

  755.     *pseq = seq;

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

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

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

  759.             return AVERROR_INVALIDDATA;

  760.         }

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

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

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

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

  765.             return AVERROR(ENOMEM);

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

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

  768.         vst->cur_slice = 0;

  769.         vst->curpic_num = pic_num;

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

  771.     }

  772.     if(type == 2)

  773.         len = FFMIN(len, pos);

  774. 

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

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

  777.         return 1;

  778.     }

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

  780.         return AVERROR(ENOMEM);

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

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

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

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

  785.         return 1;

  786.     }

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

  788.         return AVERROR(EIO);

  789.     vst->videobufpos += len;

  790.     rm->remaining_len-= len;

  791. 

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

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

  794.         *pkt= vst->pkt;

  795.         vst->pkt.data= NULL;

  796.         vst->pkt.size= 0;

  797.         vst->pkt.buf = NULL;

  798. #if FF_API_DESTRUCT_PACKET

  799. FF_DISABLE_DEPRECATION_WARNINGS

  800.         vst->pkt.destruct = NULL;

  801. FF_ENABLE_DEPRECATION_WARNINGS

  802. #endif

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

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

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

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

  807.         pkt->pts = AV_NOPTS_VALUE;

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

  809.         vst->slices = 0;

  810.         return 0;

  811.     }

  812. 

  813.     return 1;

  814. }

  815. 

  816. static inline void

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

  818. {

  819.     uint8_t *ptr;

  820.     int j;

  821. 

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

  823.         ptr = pkt->data;

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

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

  826.             ptr += 2;

  827.         }

  828.     }

  829. }

  830. 

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

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

  833.     if (ret != n) {

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

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

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

  837.     }

  838.     return ret;

  839. }

  840. 

  841. int

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

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

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

  845. {

  846.     RMDemuxContext *rm = s->priv_data;

  847.     int ret;

  848. 

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

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

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

  852.         if(ret)

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

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

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

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

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

  858.             int x;

  859.             int sps = ast->sub_packet_size;

  860.             int cfs = ast->coded_framesize;

  861.             int h = ast->sub_packet_h;

  862.             int y = ast->sub_packet_cnt;

  863.             int w = ast->audio_framesize;

  864. 

  865.             if (flags & 2)

  866.                 y = ast->sub_packet_cnt = 0;

  867.             if (!y)

  868.                 ast->audiotimestamp = timestamp;

  869. 

  870.             switch (ast->deint_id) {

  871.                 case DEINT_ID_INT4:

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

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

  874.                     break;

  875.                 case DEINT_ID_GENR:

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

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

  878.                     break;

  879.                 case DEINT_ID_SIPR:

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

  881.                     break;

  882.             }

  883. 

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

  885.                 return -1;

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

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

  888. 

  889.              ast->sub_packet_cnt = 0;

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

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

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

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

  894.             int x;

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

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

  897.             if (ast->sub_packet_cnt) {

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

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

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

  901.                 ast->audiotimestamp = timestamp;

  902.             } else

  903.                 return -1;

  904.         } else {

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

  906.                 return ret;

  907.             rm_ac3_swap_bytes(st, pkt);

  908.         }

  909.     } else {

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

  911.             return ret;

  912.     }

  913. 

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

  915. 

  916. #if 0

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

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

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

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

  921. 

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

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

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

  925.         }

  926.     }

  927. #endif

  928. 

  929.     pkt->pts = timestamp;

  930.     if (flags & 2)

  931.         pkt->flags |= AV_PKT_FLAG_KEY;

  932. 

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

  934. }

  935. 

  936. int

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

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

  939. {

  940.     RMDemuxContext *rm = s->priv_data;

  941. 

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

  943. 

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

  945.         ast->deint_id == DEINT_ID_VBRS) {

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

  947.         if (ret < 0)

  948.             return ret;

  949.     } else {

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

  951.         if (ret < 0)

  952.             return ret;

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

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

  955.                st->codec->block_align);

  956.     }

  957.     rm->audio_pkt_cnt--;

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

  959.         ast->audiotimestamp = AV_NOPTS_VALUE;

  960.         pkt->flags = AV_PKT_FLAG_KEY;

  961.     } else

  962.         pkt->flags = 0;

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

  964. 

  965.     return rm->audio_pkt_cnt;

  966. }

  967. 

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

  969. {

  970.     RMDemuxContext *rm = s->priv_data;

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

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

  973.     int64_t timestamp, pos;

  974.     int flags;

  975. 

  976.     for (;;) {

  977.         if (rm->audio_pkt_cnt) {

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

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

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

  981.             if(res < 0)

  982.                 return res;

  983.             flags = 0;

  984.         } else {

  985.             if (rm->old_format) {

  986.                 RMStream *ast;

  987. 

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

  989.                 ast = st->priv_data;

  990.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  995.             } else {

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

  997.                 if (len > 0)

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

  999.             }

  1000. 

  1001.             if (len <= 0 || avio_feof(s->pb))

  1002.                 return AVERROR(EIO);

  1003. 

  1004.             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,

  1005.                                       &seq, flags, timestamp);

  1006.             if (res < -1)

  1007.                 return res;

  1008.             if((flags&2) && (seq&0x7F) == 1)

  1009.                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);

  1010.             if (res)

  1011.                 continue;

  1012.         }

  1013. 

  1014.         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))

  1015.            || st->discard >= AVDISCARD_ALL){

  1016.             av_free_packet(pkt);

  1017.         } else

  1018.             break;

  1019.     }

  1020. 

  1021.     return 0;

  1022. }

  1023. 

  1024. static int rm_read_close(AVFormatContext *s)

  1025. {

  1026.     int i;

  1027. 

  1028.     for (i=0;i<s->nb_streams;i++)

  1029.         ff_rm_free_rmstream(s->streams[i]->priv_data);

  1030. 

  1031.     return 0;

  1032. }

  1033. 

  1034. static int rm_probe(AVProbeData *p)

  1035. {

  1036.     /* check file header */

  1037.     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&

  1038.          p->buf[2] == 'M' && p->buf[3] == 'F' &&

  1039.          p->buf[4] == 0 && p->buf[5] == 0) ||

  1040.         (p->buf[0] == '.' && p->buf[1] == 'r' &&

  1041.          p->buf[2] == 'a' && p->buf[3] == 0xfd))

  1042.         return AVPROBE_SCORE_MAX;

  1043.     else

  1044.         return 0;

  1045. }

  1046. 

  1047. static int64_t rm_read_dts(AVFormatContext *s, int stream_index,

  1048.                                int64_t *ppos, int64_t pos_limit)

  1049. {

  1050.     RMDemuxContext *rm = s->priv_data;

  1051.     int64_t pos, dts;

  1052.     int stream_index2, flags, len, h;

  1053. 

  1054.     pos = *ppos;

  1055. 

  1056.     if(rm->old_format)

  1057.         return AV_NOPTS_VALUE;

  1058. 

  1059.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1060.         return AV_NOPTS_VALUE;

  1061. 

  1062.     rm->remaining_len=0;

  1063.     for(;;){

  1064.         int seq=1;

  1065.         AVStream *st;

  1066. 

  1067.         len = rm_sync(s, &dts, &flags, &stream_index2, &pos);

  1068.         if(len<0)

  1069.             return AV_NOPTS_VALUE;

  1070. 

  1071.         st = s->streams[stream_index2];

  1072.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1073.             h= avio_r8(s->pb); len--;

  1074.             if(!(h & 0x40)){

  1075.                 seq = avio_r8(s->pb); len--;

  1076.             }

  1077.         }

  1078. 

  1079.         if((flags&2) && (seq&0x7F) == 1){

  1080.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  1081.                     flags, stream_index2, stream_index, dts, seq);

  1082.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  1083.             if(stream_index2 == stream_index)

  1084.                 break;

  1085.         }

  1086. 

  1087.         avio_skip(s->pb, len);

  1088.     }

  1089.     *ppos = pos;

  1090.     return dts;

  1091. }

  1092. 

  1093. static int rm_read_seek(AVFormatContext *s, int stream_index,

  1094.                         int64_t pts, int flags)

  1095. {

  1096.     RMDemuxContext *rm = s->priv_data;

  1097. 

  1098.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1099.         return -1;

  1100.     rm->audio_pkt_cnt = 0;

  1101.     return 0;

  1102. }

  1103. 

  1104. 

  1105. AVInputFormat ff_rm_demuxer = {

  1106.     .name           = "rm",

  1107.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1108.     .priv_data_size = sizeof(RMDemuxContext),

  1109.     .read_probe     = rm_probe,

  1110.     .read_header    = rm_read_header,

  1111.     .read_packet    = rm_read_packet,

  1112.     .read_close     = rm_read_close,

  1113.     .read_timestamp = rm_read_dts,

  1114.     .read_seek      = rm_read_seek,

  1115. };

  1116. 

  1117. AVInputFormat ff_rdt_demuxer = {

  1118.     .name           = "rdt",

  1119.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1120.     .priv_data_size = sizeof(RMDemuxContext),

  1121.     .read_close     = rm_read_close,

  1122.     .flags          = AVFMT_NOFILE,

  1123. };