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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 "libavutil/avassert.h"

  23. #include "libavutil/avstring.h"

  24. #include "libavutil/intreadwrite.h"

  25. #include "libavutil/dict.h"

  26. #include "avformat.h"

  27. #include "internal.h"

  28. #include "riff.h"

  29. #include "rmsipr.h"

  30. #include "rm.h"

  31. 

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

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

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

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

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

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

  38. 

  39. struct RMStream {

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

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

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

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

  44.     int cur_slice, slices;

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

  46.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  53. };

  54. 

  55. typedef struct {

  56.     int nb_packets;

  57.     int old_format;

  58.     int current_stream;

  59.     int remaining_len;

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

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

  62. } RMDemuxContext;

  63. 

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

  65. {

  66.     int i;

  67.     char *q, r;

  68. 

  69.     q = buf;

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

  71.         r = avio_r8(pb);

  72.         if (i < buf_size - 1)

  73.             *q++ = r;

  74.     }

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

  76. }

  77. 

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

  79. {

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

  81. }

  82. 

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

  84. {

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

  86.         return -1;

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

  88.     if (!avctx->extradata)

  89.         return AVERROR(ENOMEM);

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

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

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

  93.         return AVERROR(EIO);

  94.     return 0;

  95. }

  96. 

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

  98. {

  99.     char buf[1024];

  100.     int i;

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

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

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

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

  105.     }

  106. }

  107. 

  108. RMStream *ff_rm_alloc_rmstream (void)

  109. {

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

  111.     rms->curpic_num = -1;

  112.     return rms;

  113. }

  114. 

  115. void ff_rm_free_rmstream (RMStream *rms)

  116. {

  117.     av_free_packet(&rms->pkt);

  118. }

  119. 

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

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

  122. {

  123.     char buf[256];

  124.     uint32_t version;

  125.     int ret;

  126. 

  127.     /* ra type header */

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

  129.     if (version == 3) {

  130.         int header_size = avio_rb16(pb);

  131.         int64_t startpos = avio_tell(pb);

  132.         avio_skip(pb, 14);

  133.         rm_read_metadata(s, 0);

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

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

  136.             avio_r8(pb);

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

  138.         }

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

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

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

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

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

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

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

  146.         ast->deint_id = DEINT_ID_INT0;

  147.     } else {

  148.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  149.         int codecdata_length;

  150.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  165.         if (version == 5) {

  166.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  167.         }

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

  169.         avio_rb32(pb);

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

  171.         if (version == 5) {

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

  173.             avio_read(pb, buf, 4);

  174.             buf[4] = 0;

  175.         } else {

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

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

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

  179.         }

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

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

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

  183.                                                 st->codec->codec_tag);

  184. 

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

  186.         case AV_CODEC_ID_AC3:

  187.             st->need_parsing = AVSTREAM_PARSE_FULL;

  188.             break;

  189.         case AV_CODEC_ID_RA_288:

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

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

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

  193.             break;

  194.         case AV_CODEC_ID_COOK:

  195.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  196.         case AV_CODEC_ID_ATRAC3:

  197.         case AV_CODEC_ID_SIPR:

  198.             avio_rb16(pb); avio_r8(pb);

  199.             if (version == 5)

  200.                 avio_r8(pb);

  201.             codecdata_length = avio_rb32(pb);

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

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

  204.                 return -1;

  205.             }

  206. 

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

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

  209.                 if (flavor > 3) {

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

  211.                            flavor);

  212.                     return -1;

  213.                 }

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

  215.             } else {

  216.                 if(sub_packet_size <= 0){

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

  218.                     return -1;

  219.                 }

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

  221.             }

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

  223.                 return ret;

  224. 

  225.             break;

  226.         case AV_CODEC_ID_AAC:

  227.             avio_rb16(pb); avio_r8(pb);

  228.             if (version == 5)

  229.                 avio_r8(pb);

  230.             codecdata_length = avio_rb32(pb);

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

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

  233.                 return -1;

  234.             }

  235.             if (codecdata_length >= 1) {

  236.                 avio_r8(pb);

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

  238.                     return ret;

  239.             }

  240.             break;

  241.         default:

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

  243.         }

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

  245.             ast->deint_id == DEINT_ID_GENR ||

  246.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  250.                 return AVERROR_INVALIDDATA;

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

  252.                 return AVERROR(ENOMEM);

  253.         }

  254.         switch (ast->deint_id) {

  255.         case DEINT_ID_INT4:

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

  257.                 sub_packet_h <= 1 ||

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

  259.                 return AVERROR_INVALIDDATA;

  260.             break;

  261.         case DEINT_ID_GENR:

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

  263.                 ast->sub_packet_size > ast->audio_framesize)

  264.                 return AVERROR_INVALIDDATA;

  265.             break;

  266.         case DEINT_ID_SIPR:

  267.         case DEINT_ID_INT0:

  268.         case DEINT_ID_VBRS:

  269.         case DEINT_ID_VBRF:

  270.             break;

  271.         default:

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

  273.             return AVERROR_INVALIDDATA;

  274.         }

  275. 

  276.         if (read_all) {

  277.             avio_r8(pb);

  278.             avio_r8(pb);

  279.             avio_r8(pb);

  280.             rm_read_metadata(s, 0);

  281.         }

  282.     }

  283.     return 0;

  284. }

  285. 

  286. int

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

  288.                            AVStream *st, RMStream *rst, int codec_data_size, const uint8_t *mime)

  289. {

  290.     unsigned int v;

  291.     int size;

  292.     int64_t codec_pos;

  293.     int ret;

  294. 

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

  296.     codec_pos = avio_tell(pb);

  297.     v = avio_rb32(pb);

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

  299.         /* ra type header */

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

  301.             return -1;

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

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

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

  305.             return ret;

  306. 

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

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

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

  310.                                                 st->codec->codec_tag);

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

  312.         int stream_count, rule_count, property_count, i;

  313.         ff_free_stream(s, st);

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

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

  316.             goto skip;

  317.         }

  318.         stream_count = avio_rb16(pb);

  319.         avio_skip(pb, 6*stream_count);

  320.         rule_count = avio_rb16(pb);

  321.         avio_skip(pb, 2*rule_count);

  322.         property_count = avio_rb16(pb);

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

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

  325.             avio_rb32(pb);

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

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

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

  329.             }

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

  331.             switch(avio_rb32(pb)) {

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

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

  334.                 break;

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

  336.             }

  337.         }

  338.     } else {

  339.         int fps;

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

  341.         fail1:

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

  343.             goto skip;

  344.         }

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

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

  347.                                                st->codec->codec_tag);

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

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

  350.             goto fail1;

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

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

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

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

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

  356.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  357.         fps = avio_rb32(pb);

  358. 

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

  360.             return ret;

  361. 

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

  363.                   0x10000, fps, (1 << 30) - 1);

  364. #if FF_API_R_FRAME_RATE

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

  366. #endif

  367.     }

  368. 

  369. skip:

  370.     /* skip codec info */

  371.     size = avio_tell(pb) - codec_pos;

  372.     avio_skip(pb, codec_data_size - size);

  373. 

  374.     return 0;

  375. }

  376. 

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

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

  379. static int rm_read_index(AVFormatContext *s)

  380. {

  381.     AVIOContext *pb = s->pb;

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

  383.     AVStream *st;

  384. 

  385.     do {

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

  387.             return -1;

  388.         size     = avio_rb32(pb);

  389.         if (size < 20)

  390.             return -1;

  391.         avio_skip(pb, 2);

  392.         n_pkts   = avio_rb32(pb);

  393.         str_id   = avio_rb16(pb);

  394.         next_off = avio_rb32(pb);

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

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

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

  398.                 break;

  399.             }

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

  401.             av_log(s, AV_LOG_ERROR,

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

  403.                    str_id, avio_tell(pb));

  404.             goto skip;

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

  406.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  411.             goto skip;

  412.         }

  413. 

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

  415.             avio_skip(pb, 2);

  416.             pts = avio_rb32(pb);

  417.             pos = avio_rb32(pb);

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

  419. 

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

  421.         }

  422. 

  423. skip:

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

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

  426.             av_log(s, AV_LOG_ERROR,

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

  428.             return -1;

  429.         }

  430.     } while (next_off);

  431. 

  432.     return 0;

  433. }

  434. 

  435. static int rm_read_header_old(AVFormatContext *s)

  436. {

  437.     RMDemuxContext *rm = s->priv_data;

  438.     AVStream *st;

  439. 

  440.     rm->old_format = 1;

  441.     st = avformat_new_stream(s, NULL);

  442.     if (!st)

  443.         return -1;

  444.     st->priv_data = ff_rm_alloc_rmstream();

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

  446. }

  447. 

  448. static int rm_read_header(AVFormatContext *s)

  449. {

  450.     RMDemuxContext *rm = s->priv_data;

  451.     AVStream *st;

  452.     AVIOContext *pb = s->pb;

  453.     unsigned int tag;

  454.     int tag_size;

  455.     unsigned int start_time, duration;

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

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

  458.     int flags = 0;

  459. 

  460.     tag = avio_rl32(pb);

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

  462.         /* very old .ra format */

  463.         return rm_read_header_old(s);

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

  465.         return AVERROR(EIO);

  466.     }

  467. 

  468.     tag_size = avio_rb32(pb);

  469.     avio_skip(pb, tag_size - 8);

  470. 

  471.     for(;;) {

  472.         if (url_feof(pb))

  473.             return -1;

  474.         tag = avio_rl32(pb);

  475.         tag_size = avio_rb32(pb);

  476.         avio_rb16(pb);

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

  478.                 (tag      ) & 0xff,

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

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

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

  482.                 tag,

  483.                 tag_size);

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

  485.             return -1;

  486.         switch(tag) {

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

  488.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  501.             break;

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

  503.             rm_read_metadata(s, 1);

  504.             break;

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

  506.             st = avformat_new_stream(s, NULL);

  507.             if (!st)

  508.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  517.             st->start_time = start_time;

  518.             st->duration = duration;

  519.             if(duration>0)

  520.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  524.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  527.                 return -1;

  528.             break;

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

  530.             goto header_end;

  531.         default:

  532.             /* unknown tag: skip it */

  533.             avio_skip(pb, tag_size - 10);

  534.             break;

  535.         }

  536.     }

  537.  header_end:

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

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

  540.         rm->nb_packets = 3600 * 25;

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

  542. 

  543.     if (!data_off)

  544.         data_off = avio_tell(pb) - 18;

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

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

  547.         rm_read_index(s);

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

  549.     }

  550. 

  551.     return 0;

  552. }

  553. 

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

  555. {

  556.     int n, n1;

  557. 

  558.     n = avio_rb16(pb);

  559.     (*len)-=2;

  560.     n &= 0x7FFF;

  561.     if (n >= 0x4000) {

  562.         return n - 0x4000;

  563.     } else {

  564.         n1 = avio_rb16(pb);

  565.         (*len)-=2;

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

  567.     }

  568. }

  569. 

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

  571. #define RAW_PACKET_SIZE 1000

  572. 

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

  574.     RMDemuxContext *rm = s->priv_data;

  575.     AVIOContext *pb = s->pb;

  576.     AVStream *st;

  577.     uint32_t state=0xFFFFFFFF;

  578. 

  579.     while(!url_feof(pb)){

  580.         int len, num, i;

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

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

  583.             num= rm->current_stream;

  584.             len= rm->remaining_len;

  585.             *timestamp = AV_NOPTS_VALUE;

  586.             *flags= 0;

  587.         }else{

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

  589. 

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

  591.                 int n_pkts, expected_len;

  592.                 len = avio_rb32(pb);

  593.                 avio_skip(pb, 2);

  594.                 n_pkts = avio_rb32(pb);

  595.                 expected_len = 20 + n_pkts * 14;

  596.                 if (len == 20)

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

  598.                     len = expected_len;

  599.                 else if (len != expected_len)

  600.                     av_log(s, AV_LOG_WARNING,

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

  602.                            len, n_pkts, expected_len);

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

  604.                 if(len<0)

  605.                     continue;

  606.                 goto skip;

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

  608.                 av_log(s, AV_LOG_WARNING,

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

  610.             }

  611. 

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

  613.                 continue;

  614.             len=state - 12;

  615.             state= 0xFFFFFFFF;

  616. 

  617.             num = avio_rb16(pb);

  618.             *timestamp = avio_rb32(pb);

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

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

  621.         }

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

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

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

  625.                 break;

  626.         }

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

  628. skip:

  629.             /* skip packet if unknown number */

  630.             avio_skip(pb, len);

  631.             rm->remaining_len = 0;

  632.             continue;

  633.         }

  634.         *stream_index= i;

  635. 

  636.         return len;

  637.     }

  638.     return -1;

  639. }

  640. 

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

  642.                                    RMDemuxContext *rm, RMStream *vst,

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

  644.                                    int64_t *timestamp)

  645. {

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

  647.     int type;

  648. 

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

  650.     type = hdr >> 6;

  651. 

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

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

  654.     }

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

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

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

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

  659.     }

  660.     if(len<0)

  661.         return -1;

  662.     rm->remaining_len = len;

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

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

  665.             len= len2;

  666.             *timestamp = pos;

  667.         }

  668.         if(rm->remaining_len < len)

  669.             return -1;

  670.         rm->remaining_len -= len;

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

  672.             return AVERROR(EIO);

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

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

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

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

  677.         return 0;

  678.     }

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

  680. 

  681.     *pseq = seq;

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

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

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

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

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

  687.             return AVERROR(ENOMEM);

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

  689.         vst->cur_slice = 0;

  690.         vst->curpic_num = pic_num;

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

  692.     }

  693.     if(type == 2)

  694.         len = FFMIN(len, pos);

  695. 

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

  697.         return 1;

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

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

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

  701.         return 1;

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

  703.         return AVERROR(EIO);

  704.     vst->videobufpos += len;

  705.     rm->remaining_len-= len;

  706. 

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

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

  709.         *pkt= vst->pkt;

  710.         vst->pkt.data= NULL;

  711.         vst->pkt.size= 0;

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

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

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

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

  716.         pkt->pts = AV_NOPTS_VALUE;

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

  718.         vst->slices = 0;

  719.         return 0;

  720.     }

  721. 

  722.     return 1;

  723. }

  724. 

  725. static inline void

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

  727. {

  728.     uint8_t *ptr;

  729.     int j;

  730. 

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

  732.         ptr = pkt->data;

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

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

  735.             ptr += 2;

  736.         }

  737.     }

  738. }

  739. 

  740. int

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

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

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

  744. {

  745.     RMDemuxContext *rm = s->priv_data;

  746. 

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

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

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

  750.             return -1; //got partial frame

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

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

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

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

  755.             int x;

  756.             int sps = ast->sub_packet_size;

  757.             int cfs = ast->coded_framesize;

  758.             int h = ast->sub_packet_h;

  759.             int y = ast->sub_packet_cnt;

  760.             int w = ast->audio_framesize;

  761. 

  762.             if (flags & 2)

  763.                 y = ast->sub_packet_cnt = 0;

  764.             if (!y)

  765.                 ast->audiotimestamp = timestamp;

  766. 

  767.             switch (ast->deint_id) {

  768.                 case DEINT_ID_INT4:

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

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

  771.                     break;

  772.                 case DEINT_ID_GENR:

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

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

  775.                     break;

  776.                 case DEINT_ID_SIPR:

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

  778.                     break;

  779.             }

  780. 

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

  782.                 return -1;

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

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

  785. 

  786.              ast->sub_packet_cnt = 0;

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

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

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

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

  791.             int x;

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

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

  794.             if (ast->sub_packet_cnt) {

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

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

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

  798.                 ast->audiotimestamp = timestamp;

  799.             } else

  800.                 return -1;

  801.         } else {

  802.             av_get_packet(pb, pkt, len);

  803.             rm_ac3_swap_bytes(st, pkt);

  804.         }

  805.     } else

  806.         av_get_packet(pb, pkt, len);

  807. 

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

  809. 

  810. #if 0

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

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

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

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

  815. 

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

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

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

  819.         }

  820.     }

  821. #endif

  822. 

  823.     pkt->pts = timestamp;

  824.     if (flags & 2)

  825.         pkt->flags |= AV_PKT_FLAG_KEY;

  826. 

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

  828. }

  829. 

  830. int

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

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

  833. {

  834.     RMDemuxContext *rm = s->priv_data;

  835. 

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

  837. 

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

  839.         ast->deint_id == DEINT_ID_VBRS)

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

  841.     else {

  842.         if(av_new_packet(pkt, st->codec->block_align) < 0)

  843.             return AVERROR(ENOMEM);

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

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

  846.                st->codec->block_align);

  847.     }

  848.     rm->audio_pkt_cnt--;

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

  850.         ast->audiotimestamp = AV_NOPTS_VALUE;

  851.         pkt->flags = AV_PKT_FLAG_KEY;

  852.     } else

  853.         pkt->flags = 0;

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

  855. 

  856.     return rm->audio_pkt_cnt;

  857. }

  858. 

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

  860. {

  861.     RMDemuxContext *rm = s->priv_data;

  862.     AVStream *st;

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

  864.     int64_t timestamp, pos;

  865.     int flags;

  866. 

  867.     for (;;) {

  868.         if (rm->audio_pkt_cnt) {

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

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

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

  872.             if(res < 0)

  873.                 return res;

  874.             flags = 0;

  875.         } else {

  876.             if (rm->old_format) {

  877.                 RMStream *ast;

  878. 

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

  880.                 ast = st->priv_data;

  881.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  886.             } else {

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

  888.                 if (len > 0)

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

  890.             }

  891. 

  892.             if(len<0 || url_feof(s->pb))

  893.                 return AVERROR(EIO);

  894. 

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

  896.                                       &seq, flags, timestamp);

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

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

  899.             if (res)

  900.                 continue;

  901.         }

  902. 

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

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

  905.             av_free_packet(pkt);

  906.         } else

  907.             break;

  908.     }

  909. 

  910.     return 0;

  911. }

  912. 

  913. static int rm_read_close(AVFormatContext *s)

  914. {

  915.     int i;

  916. 

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

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

  919. 

  920.     return 0;

  921. }

  922. 

  923. static int rm_probe(AVProbeData *p)

  924. {

  925.     /* check file header */

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

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

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

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

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

  931.         return AVPROBE_SCORE_MAX;

  932.     else

  933.         return 0;

  934. }

  935. 

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

  937.                                int64_t *ppos, int64_t pos_limit)

  938. {

  939.     RMDemuxContext *rm = s->priv_data;

  940.     int64_t pos, dts;

  941.     int stream_index2, flags, len, h;

  942. 

  943.     pos = *ppos;

  944. 

  945.     if(rm->old_format)

  946.         return AV_NOPTS_VALUE;

  947. 

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

  949.         return AV_NOPTS_VALUE;

  950. 

  951.     rm->remaining_len=0;

  952.     for(;;){

  953.         int seq=1;

  954.         AVStream *st;

  955. 

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

  957.         if(len<0)

  958.             return AV_NOPTS_VALUE;

  959. 

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

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

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

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

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

  965.             }

  966.         }

  967. 

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

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

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

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

  972.             if(stream_index2 == stream_index)

  973.                 break;

  974.         }

  975. 

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

  977.     }

  978.     *ppos = pos;

  979.     return dts;

  980. }

  981. 

  982. AVInputFormat ff_rm_demuxer = {

  983.     .name           = "rm",

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

  985.     .priv_data_size = sizeof(RMDemuxContext),

  986.     .read_probe     = rm_probe,

  987.     .read_header    = rm_read_header,

  988.     .read_packet    = rm_read_packet,

  989.     .read_close     = rm_read_close,

  990.     .read_timestamp = rm_read_dts,

  991. };

  992. 

  993. AVInputFormat ff_rdt_demuxer = {

  994.     .name           = "rdt",

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

  996.     .priv_data_size = sizeof(RMDemuxContext),

  997.     .read_close     = rm_read_close,

  998.     .flags          = AVFMT_NOFILE,

  999. };