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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 {

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

  69. {

  70.     int i;

  71.     char *q, r;

  72. 

  73.     q = buf;

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

  75.         r = avio_r8(pb);

  76.         if (i < buf_size - 1)

  77.             *q++ = r;

  78.     }

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

  80. }

  81. 

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

  83. {

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

  85. }

  86. 

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

  88. {

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

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

  91.         return -1;

  92.     }

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

  94.         return AVERROR(ENOMEM);

  95.     return 0;

  96. }

  97. 

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

  99. {

  100.     char buf[1024];

  101.     int i;

  102. 

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

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

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

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

  107.     }

  108. }

  109. 

  110. RMStream *ff_rm_alloc_rmstream (void)

  111. {

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

  113.     rms->curpic_num = -1;

  114.     return rms;

  115. }

  116. 

  117. void ff_rm_free_rmstream (RMStream *rms)

  118. {

  119.     av_free_packet(&rms->pkt);

  120. }

  121. 

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

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

  124. {

  125.     char buf[256];

  126.     uint32_t version;

  127.     int ret;

  128. 

  129.     /* ra type header */

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

  131.     if (version == 3) {

  132.         unsigned bytes_per_minute;

  133.         int header_size = avio_rb16(pb);

  134.         int64_t startpos = avio_tell(pb);

  135.         avio_skip(pb, 8);

  136.         bytes_per_minute = avio_rb16(pb);

  137.         avio_skip(pb, 4);

  138.         rm_read_metadata(s, pb, 0);

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

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

  141.             avio_r8(pb);

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

  143.         }

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

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

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

  147.         if (bytes_per_minute)

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

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

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

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

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

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

  154.         ast->deint_id = DEINT_ID_INT0;

  155.     } else {

  156.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  157.         int codecdata_length;

  158.         unsigned bytes_per_minute;

  159.         /* old version (4) */

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

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

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

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

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

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

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

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

  168.         bytes_per_minute = avio_rb32(pb);

  169.         if (version == 4) {

  170.             if (bytes_per_minute)

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

  172.         }

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

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

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

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

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

  178.         if (version == 5) {

  179.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  180.         }

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

  182.         avio_rb32(pb);

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

  184.         if (version == 5) {

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

  186.             avio_read(pb, buf, 4);

  187.             buf[4] = 0;

  188.         } else {

  189.             AV_WL32(buf, 0);

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

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

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

  193.         }

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

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

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

  197.                                                 st->codec->codec_tag);

  198. 

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

  200.         case AV_CODEC_ID_AC3:

  201.             st->need_parsing = AVSTREAM_PARSE_FULL;

  202.             break;

  203.         case AV_CODEC_ID_RA_288:

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

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

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

  207.             break;

  208.         case AV_CODEC_ID_COOK:

  209.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  210.         case AV_CODEC_ID_ATRAC3:

  211.         case AV_CODEC_ID_SIPR:

  212.             if (read_all) {

  213.                 codecdata_length = 0;

  214.             } else {

  215.                 avio_rb16(pb); avio_r8(pb);

  216.                 if (version == 5)

  217.                     avio_r8(pb);

  218.                 codecdata_length = avio_rb32(pb);

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

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

  221.                     return -1;

  222.                 }

  223.             }

  224. 

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

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

  227.                 if (flavor > 3) {

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

  229.                            flavor);

  230.                     return -1;

  231.                 }

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

  233.             } else {

  234.                 if(sub_packet_size <= 0){

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

  236.                     return -1;

  237.                 }

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

  239.             }

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

  241.                 return ret;

  242. 

  243.             break;

  244.         case AV_CODEC_ID_AAC:

  245.             avio_rb16(pb); avio_r8(pb);

  246.             if (version == 5)

  247.                 avio_r8(pb);

  248.             codecdata_length = avio_rb32(pb);

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

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

  251.                 return -1;

  252.             }

  253.             if (codecdata_length >= 1) {

  254.                 avio_r8(pb);

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

  256.                     return ret;

  257.             }

  258.             break;

  259.         }

  260.         switch (ast->deint_id) {

  261.         case DEINT_ID_INT4:

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

  263.                 sub_packet_h <= 1 ||

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

  265.                 return AVERROR_INVALIDDATA;

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

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

  268.                 return AVERROR_INVALIDDATA;

  269.             }

  270.             break;

  271.         case DEINT_ID_GENR:

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

  273.                 ast->sub_packet_size > ast->audio_framesize)

  274.                 return AVERROR_INVALIDDATA;

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

  276.                 return AVERROR_INVALIDDATA;

  277.             break;

  278.         case DEINT_ID_SIPR:

  279.         case DEINT_ID_INT0:

  280.         case DEINT_ID_VBRS:

  281.         case DEINT_ID_VBRF:

  282.             break;

  283.         default:

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

  285.             return AVERROR_INVALIDDATA;

  286.         }

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

  288.             ast->deint_id == DEINT_ID_GENR ||

  289.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  293.                 return AVERROR_INVALIDDATA;

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

  295.                 return AVERROR(ENOMEM);

  296.         }

  297. 

  298.         if (read_all) {

  299.             avio_r8(pb);

  300.             avio_r8(pb);

  301.             avio_r8(pb);

  302.             rm_read_metadata(s, pb, 0);

  303.         }

  304.     }

  305.     return 0;

  306. }

  307. 

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

  309.                               AVStream *st, RMStream *rst,

  310.                               unsigned int codec_data_size, const uint8_t *mime)

  311. {

  312.     unsigned int v;

  313.     int size;

  314.     int64_t codec_pos;

  315.     int ret;

  316. 

  317.     if (codec_data_size > INT_MAX)

  318.         return AVERROR_INVALIDDATA;

  319. 

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

  321.     codec_pos = avio_tell(pb);

  322.     v = avio_rb32(pb);

  323. 

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

  325.         int number_of_streams = avio_rb16(pb);

  326.         int number_of_mdpr;

  327.         int i;

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

  329.             avio_rb16(pb);

  330.         number_of_mdpr = avio_rb16(pb);

  331.         if (number_of_mdpr != 1) {

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

  333.         }

  334.         avio_rb32(pb);

  335.         v = avio_rb32(pb);

  336.     }

  337. 

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

  339.         /* ra type header */

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

  341.             return -1;

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

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

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

  345.             return ret;

  346. 

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

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

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

  350.                                                 st->codec->codec_tag);

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

  352.         int stream_count, rule_count, property_count, i;

  353.         ff_free_stream(s, st);

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

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

  356.             goto skip;

  357.         }

  358.         stream_count = avio_rb16(pb);

  359.         avio_skip(pb, 6*stream_count);

  360.         rule_count = avio_rb16(pb);

  361.         avio_skip(pb, 2*rule_count);

  362.         property_count = avio_rb16(pb);

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

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

  365.             avio_rb32(pb);

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

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

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

  369.             }

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

  371.             switch(avio_rb32(pb)) {

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

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

  374.                 break;

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

  376.             }

  377.         }

  378.     } else {

  379.         int fps;

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

  381.         fail1:

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

  383.             goto skip;

  384.         }

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

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

  387.                                                st->codec->codec_tag);

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

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

  390.             goto fail1;

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

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

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

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

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

  396.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  397.         fps = avio_rb32(pb);

  398. 

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

  400.             return ret;

  401. 

  402.         if (fps > 0) {

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

  404.                       0x10000, fps, (1 << 30) - 1);

  405. #if FF_API_R_FRAME_RATE

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

  407. #endif

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

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

  410.             return AVERROR_INVALIDDATA;

  411.         }

  412.     }

  413. 

  414. skip:

  415.     /* skip codec info */

  416.     size = avio_tell(pb) - codec_pos;

  417.     if (codec_data_size >= size) {

  418.         avio_skip(pb, codec_data_size - size);

  419.     } else {

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

  421.     }

  422. 

  423.     return 0;

  424. }

  425. 

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

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

  428. static int rm_read_index(AVFormatContext *s)

  429. {

  430.     AVIOContext *pb = s->pb;

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

  432.     AVStream *st;

  433. 

  434.     do {

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

  436.             return -1;

  437.         size     = avio_rb32(pb);

  438.         if (size < 20)

  439.             return -1;

  440.         avio_skip(pb, 2);

  441.         n_pkts   = avio_rb32(pb);

  442.         str_id   = avio_rb16(pb);

  443.         next_off = avio_rb32(pb);

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

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

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

  447.                 break;

  448.             }

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

  450.             av_log(s, AV_LOG_ERROR,

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

  452.                    str_id, avio_tell(pb));

  453.             goto skip;

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

  455.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  460.             goto skip;

  461.         }

  462. 

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

  464.             avio_skip(pb, 2);

  465.             pts = avio_rb32(pb);

  466.             pos = avio_rb32(pb);

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

  468. 

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

  470.         }

  471. 

  472. skip:

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

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

  475.             av_log(s, AV_LOG_ERROR,

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

  477.             return -1;

  478.         }

  479.     } while (next_off);

  480. 

  481.     return 0;

  482. }

  483. 

  484. static int rm_read_header_old(AVFormatContext *s)

  485. {

  486.     RMDemuxContext *rm = s->priv_data;

  487.     AVStream *st;

  488. 

  489.     rm->old_format = 1;

  490.     st = avformat_new_stream(s, NULL);

  491.     if (!st)

  492.         return -1;

  493.     st->priv_data = ff_rm_alloc_rmstream();

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

  495. }

  496. 

  497. static int rm_read_header(AVFormatContext *s)

  498. {

  499.     RMDemuxContext *rm = s->priv_data;

  500.     AVStream *st;

  501.     AVIOContext *pb = s->pb;

  502.     unsigned int tag;

  503.     int tag_size;

  504.     unsigned int start_time, duration;

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

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

  507.     int flags = 0;

  508. 

  509.     tag = avio_rl32(pb);

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

  511.         /* very old .ra format */

  512.         return rm_read_header_old(s);

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

  514.         return AVERROR(EIO);

  515.     }

  516. 

  517.     tag_size = avio_rb32(pb);

  518.     avio_skip(pb, tag_size - 8);

  519. 

  520.     for(;;) {

  521.         if (avio_feof(pb))

  522.             return -1;

  523.         tag = avio_rl32(pb);

  524.         tag_size = avio_rb32(pb);

  525.         avio_rb16(pb);

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

  527.                 (tag      ) & 0xff,

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

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

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

  531.                 tag,

  532.                 tag_size);

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

  534.             return -1;

  535.         switch(tag) {

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

  537.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  550.             break;

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

  552.             rm_read_metadata(s, pb, 1);

  553.             break;

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

  555.             st = avformat_new_stream(s, NULL);

  556.             if (!st)

  557.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  566.             st->start_time = start_time;

  567.             st->duration = duration;

  568.             if(duration>0)

  569.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  573.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  576.                 return -1;

  577.             break;

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

  579.             goto header_end;

  580.         default:

  581.             /* unknown tag: skip it */

  582.             avio_skip(pb, tag_size - 10);

  583.             break;

  584.         }

  585.     }

  586.  header_end:

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

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

  589.         rm->nb_packets = 3600 * 25;

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

  591. 

  592.     if (!data_off)

  593.         data_off = avio_tell(pb) - 18;

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

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

  596.         rm_read_index(s);

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

  598.     }

  599. 

  600.     return 0;

  601. }

  602. 

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

  604. {

  605.     int n, n1;

  606. 

  607.     n = avio_rb16(pb);

  608.     (*len)-=2;

  609.     n &= 0x7FFF;

  610.     if (n >= 0x4000) {

  611.         return n - 0x4000;

  612.     } else {

  613.         n1 = avio_rb16(pb);

  614.         (*len)-=2;

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

  616.     }

  617. }

  618. 

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

  620. #define RAW_PACKET_SIZE 1000

  621. 

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

  623.     RMDemuxContext *rm = s->priv_data;

  624.     AVIOContext *pb = s->pb;

  625.     AVStream *st;

  626.     uint32_t state=0xFFFFFFFF;

  627. 

  628.     while(!avio_feof(pb)){

  629.         int len, num, i;

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

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

  632.             num= rm->current_stream;

  633.             len= rm->remaining_len;

  634.             *timestamp = AV_NOPTS_VALUE;

  635.             *flags= 0;

  636.         }else{

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

  638. 

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

  640.                 int n_pkts, expected_len;

  641.                 len = avio_rb32(pb);

  642.                 avio_skip(pb, 2);

  643.                 n_pkts = avio_rb32(pb);

  644.                 expected_len = 20 + n_pkts * 14;

  645.                 if (len == 20)

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

  647.                     len = expected_len;

  648.                 else if (len != expected_len)

  649.                     av_log(s, AV_LOG_WARNING,

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

  651.                            len, n_pkts, expected_len);

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

  653.                 if(len<0)

  654.                     continue;

  655.                 goto skip;

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

  657.                 av_log(s, AV_LOG_WARNING,

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

  659.             }

  660. 

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

  662.                 continue;

  663.             len=state - 12;

  664.             state= 0xFFFFFFFF;

  665. 

  666.             num = avio_rb16(pb);

  667.             *timestamp = avio_rb32(pb);

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

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

  670.         }

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

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

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

  674.                 break;

  675.         }

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

  677. skip:

  678.             /* skip packet if unknown number */

  679.             avio_skip(pb, len);

  680.             rm->remaining_len = 0;

  681.             continue;

  682.         }

  683.         *stream_index= i;

  684. 

  685.         return len;

  686.     }

  687.     return -1;

  688. }

  689. 

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

  691.                                    RMDemuxContext *rm, RMStream *vst,

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

  693.                                    int64_t *timestamp)

  694. {

  695.     int hdr;

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

  697.     int type;

  698.     int ret;

  699. 

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

  701.     type = hdr >> 6;

  702. 

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

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

  705.     }

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

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

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

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

  710.     }

  711.     if(len<0) {

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

  713.         return -1;

  714.     }

  715.     rm->remaining_len = len;

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

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

  718.             len= len2;

  719.             *timestamp = pos;

  720.         }

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

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

  723.             return -1;

  724.         }

  725.         rm->remaining_len -= len;

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

  727.             return AVERROR(EIO);

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

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

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

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

  732.             av_free_packet(pkt);

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

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

  735.         }

  736.         return 0;

  737.     }

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

  739. 

  740.     *pseq = seq;

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

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

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

  744.             return AVERROR_INVALIDDATA;

  745.         }

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

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

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

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

  750.             return AVERROR(ENOMEM);

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

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

  753.         vst->cur_slice = 0;

  754.         vst->curpic_num = pic_num;

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

  756.     }

  757.     if(type == 2)

  758.         len = FFMIN(len, pos);

  759. 

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

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

  762.         return 1;

  763.     }

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

  765.         return AVERROR(ENOMEM);

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

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

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

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

  770.         return 1;

  771.     }

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

  773.         return AVERROR(EIO);

  774.     vst->videobufpos += len;

  775.     rm->remaining_len-= len;

  776. 

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

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

  779.         *pkt= vst->pkt;

  780.         vst->pkt.data= NULL;

  781.         vst->pkt.size= 0;

  782.         vst->pkt.buf = NULL;

  783. #if FF_API_DESTRUCT_PACKET

  784. FF_DISABLE_DEPRECATION_WARNINGS

  785.         vst->pkt.destruct = NULL;

  786. FF_ENABLE_DEPRECATION_WARNINGS

  787. #endif

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

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

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

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

  792.         pkt->pts = AV_NOPTS_VALUE;

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

  794.         vst->slices = 0;

  795.         return 0;

  796.     }

  797. 

  798.     return 1;

  799. }

  800. 

  801. static inline void

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

  803. {

  804.     uint8_t *ptr;

  805.     int j;

  806. 

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

  808.         ptr = pkt->data;

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

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

  811.             ptr += 2;

  812.         }

  813.     }

  814. }

  815. 

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

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

  818.     if (ret != n) {

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

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

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

  822.     }

  823.     return ret;

  824. }

  825. 

  826. int

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

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

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

  830. {

  831.     RMDemuxContext *rm = s->priv_data;

  832.     int ret;

  833. 

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

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

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

  837.         if(ret)

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

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

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

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

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

  843.             int x;

  844.             int sps = ast->sub_packet_size;

  845.             int cfs = ast->coded_framesize;

  846.             int h = ast->sub_packet_h;

  847.             int y = ast->sub_packet_cnt;

  848.             int w = ast->audio_framesize;

  849. 

  850.             if (flags & 2)

  851.                 y = ast->sub_packet_cnt = 0;

  852.             if (!y)

  853.                 ast->audiotimestamp = timestamp;

  854. 

  855.             switch (ast->deint_id) {

  856.                 case DEINT_ID_INT4:

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

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

  859.                     break;

  860.                 case DEINT_ID_GENR:

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

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

  863.                     break;

  864.                 case DEINT_ID_SIPR:

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

  866.                     break;

  867.             }

  868. 

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

  870.                 return -1;

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

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

  873. 

  874.              ast->sub_packet_cnt = 0;

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

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

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

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

  879.             int x;

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

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

  882.             if (ast->sub_packet_cnt) {

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

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

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

  886.                 ast->audiotimestamp = timestamp;

  887.             } else

  888.                 return -1;

  889.         } else {

  890.             av_get_packet(pb, pkt, len);

  891.             rm_ac3_swap_bytes(st, pkt);

  892.         }

  893.     } else

  894.         av_get_packet(pb, pkt, len);

  895. 

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

  897. 

  898. #if 0

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

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

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

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

  903. 

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

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

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

  907.         }

  908.     }

  909. #endif

  910. 

  911.     pkt->pts = timestamp;

  912.     if (flags & 2)

  913.         pkt->flags |= AV_PKT_FLAG_KEY;

  914. 

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

  916. }

  917. 

  918. int

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

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

  921. {

  922.     RMDemuxContext *rm = s->priv_data;

  923. 

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

  925. 

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

  927.         ast->deint_id == DEINT_ID_VBRS)

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

  929.     else {

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

  931.         if (ret < 0)

  932.             return ret;

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

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

  935.                st->codec->block_align);

  936.     }

  937.     rm->audio_pkt_cnt--;

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

  939.         ast->audiotimestamp = AV_NOPTS_VALUE;

  940.         pkt->flags = AV_PKT_FLAG_KEY;

  941.     } else

  942.         pkt->flags = 0;

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

  944. 

  945.     return rm->audio_pkt_cnt;

  946. }

  947. 

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

  949. {

  950.     RMDemuxContext *rm = s->priv_data;

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

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

  953.     int64_t timestamp, pos;

  954.     int flags;

  955. 

  956.     for (;;) {

  957.         if (rm->audio_pkt_cnt) {

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

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

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

  961.             if(res < 0)

  962.                 return res;

  963.             flags = 0;

  964.         } else {

  965.             if (rm->old_format) {

  966.                 RMStream *ast;

  967. 

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

  969.                 ast = st->priv_data;

  970.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  975.             } else {

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

  977.                 if (len > 0)

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

  979.             }

  980. 

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

  982.                 return AVERROR(EIO);

  983. 

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

  985.                                       &seq, flags, timestamp);

  986.             if (res < -1)

  987.                 return res;

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

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

  990.             if (res)

  991.                 continue;

  992.         }

  993. 

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

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

  996.             av_free_packet(pkt);

  997.         } else

  998.             break;

  999.     }

  1000. 

  1001.     return 0;

  1002. }

  1003. 

  1004. static int rm_read_close(AVFormatContext *s)

  1005. {

  1006.     int i;

  1007. 

  1008.     for (i=0;i<s->nb_streams;i++)

  1009.         ff_rm_free_rmstream(s->streams[i]->priv_data);

  1010. 

  1011.     return 0;

  1012. }

  1013. 

  1014. static int rm_probe(AVProbeData *p)

  1015. {

  1016.     /* check file header */

  1017.     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&

  1018.          p->buf[2] == 'M' && p->buf[3] == 'F' &&

  1019.          p->buf[4] == 0 && p->buf[5] == 0) ||

  1020.         (p->buf[0] == '.' && p->buf[1] == 'r' &&

  1021.          p->buf[2] == 'a' && p->buf[3] == 0xfd))

  1022.         return AVPROBE_SCORE_MAX;

  1023.     else

  1024.         return 0;

  1025. }

  1026. 

  1027. static int64_t rm_read_dts(AVFormatContext *s, int stream_index,

  1028.                                int64_t *ppos, int64_t pos_limit)

  1029. {

  1030.     RMDemuxContext *rm = s->priv_data;

  1031.     int64_t pos, dts;

  1032.     int stream_index2, flags, len, h;

  1033. 

  1034.     pos = *ppos;

  1035. 

  1036.     if(rm->old_format)

  1037.         return AV_NOPTS_VALUE;

  1038. 

  1039.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1040.         return AV_NOPTS_VALUE;

  1041. 

  1042.     rm->remaining_len=0;

  1043.     for(;;){

  1044.         int seq=1;

  1045.         AVStream *st;

  1046. 

  1047.         len = rm_sync(s, &dts, &flags, &stream_index2, &pos);

  1048.         if(len<0)

  1049.             return AV_NOPTS_VALUE;

  1050. 

  1051.         st = s->streams[stream_index2];

  1052.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1053.             h= avio_r8(s->pb); len--;

  1054.             if(!(h & 0x40)){

  1055.                 seq = avio_r8(s->pb); len--;

  1056.             }

  1057.         }

  1058. 

  1059.         if((flags&2) && (seq&0x7F) == 1){

  1060.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  1061.                     flags, stream_index2, stream_index, dts, seq);

  1062.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  1063.             if(stream_index2 == stream_index)

  1064.                 break;

  1065.         }

  1066. 

  1067.         avio_skip(s->pb, len);

  1068.     }

  1069.     *ppos = pos;

  1070.     return dts;

  1071. }

  1072. 

  1073. static int rm_read_seek(AVFormatContext *s, int stream_index,

  1074.                         int64_t pts, int flags)

  1075. {

  1076.     RMDemuxContext *rm = s->priv_data;

  1077. 

  1078.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1079.         return -1;

  1080.     rm->audio_pkt_cnt = 0;

  1081.     return 0;

  1082. }

  1083. 

  1084. 

  1085. AVInputFormat ff_rm_demuxer = {

  1086.     .name           = "rm",

  1087.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1088.     .priv_data_size = sizeof(RMDemuxContext),

  1089.     .read_probe     = rm_probe,

  1090.     .read_header    = rm_read_header,

  1091.     .read_packet    = rm_read_packet,

  1092.     .read_close     = rm_read_close,

  1093.     .read_timestamp = rm_read_dts,

  1094.     .read_seek      = rm_read_seek,

  1095. };

  1096. 

  1097. AVInputFormat ff_rdt_demuxer = {

  1098.     .name           = "rdt",

  1099.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1100.     .priv_data_size = sizeof(RMDemuxContext),

  1101.     .read_close     = rm_read_close,

  1102.     .flags          = AVFMT_NOFILE,

  1103. };