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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/channel_layout.h"

  25. #include "libavutil/intreadwrite.h"

  26. #include "libavutil/dict.h"

  27. #include "avformat.h"

  28. #include "internal.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.         unsigned bytes_per_minute;

  131.         int header_size = avio_rb16(pb);

  132.         int64_t startpos = avio_tell(pb);

  133.         avio_skip(pb, 8);

  134.         bytes_per_minute = avio_rb16(pb);

  135.         avio_skip(pb, 4);

  136.         rm_read_metadata(s, 0);

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

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

  139.             avio_r8(pb);

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

  141.         }

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

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

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

  145.         if (bytes_per_minute)

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

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

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

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

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

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

  152.         ast->deint_id = DEINT_ID_INT0;

  153.     } else {

  154.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  155.         int codecdata_length;

  156.         unsigned bytes_per_minute;

  157.         /* old version (4) */

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

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

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

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

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

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

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

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

  166.         bytes_per_minute = avio_rb32(pb);

  167.         if (version == 4) {

  168.             if (bytes_per_minute)

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

  170.         }

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

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

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

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

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

  176.         if (version == 5) {

  177.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  178.         }

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

  180.         avio_rb32(pb);

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

  182.         if (version == 5) {

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

  184.             avio_read(pb, buf, 4);

  185.             buf[4] = 0;

  186.         } else {

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

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

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

  190.         }

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

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

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

  194.                                                 st->codec->codec_tag);

  195. 

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

  197.         case AV_CODEC_ID_AC3:

  198.             st->need_parsing = AVSTREAM_PARSE_FULL;

  199.             break;

  200.         case AV_CODEC_ID_RA_288:

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

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

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

  204.             break;

  205.         case AV_CODEC_ID_COOK:

  206.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  207.         case AV_CODEC_ID_ATRAC3:

  208.         case AV_CODEC_ID_SIPR:

  209.             if (read_all) {

  210.                 codecdata_length = 0;

  211.             } else {

  212.                 avio_rb16(pb); avio_r8(pb);

  213.                 if (version == 5)

  214.                     avio_r8(pb);

  215.                 codecdata_length = avio_rb32(pb);

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

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

  218.                     return -1;

  219.                 }

  220.             }

  221. 

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

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

  224.                 if (flavor > 3) {

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

  226.                            flavor);

  227.                     return -1;

  228.                 }

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

  230.             } else {

  231.                 if(sub_packet_size <= 0){

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

  233.                     return -1;

  234.                 }

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

  236.             }

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

  238.                 return ret;

  239. 

  240.             break;

  241.         case AV_CODEC_ID_AAC:

  242.             avio_rb16(pb); avio_r8(pb);

  243.             if (version == 5)

  244.                 avio_r8(pb);

  245.             codecdata_length = avio_rb32(pb);

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

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

  248.                 return -1;

  249.             }

  250.             if (codecdata_length >= 1) {

  251.                 avio_r8(pb);

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

  253.                     return ret;

  254.             }

  255.             break;

  256.         default:

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

  258.         }

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

  260.             ast->deint_id == DEINT_ID_GENR ||

  261.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  265.                 return AVERROR_INVALIDDATA;

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

  267.                 return AVERROR(ENOMEM);

  268.         }

  269.         switch (ast->deint_id) {

  270.         case DEINT_ID_INT4:

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

  272.                 sub_packet_h <= 1 ||

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

  274.                 return AVERROR_INVALIDDATA;

  275.             break;

  276.         case DEINT_ID_GENR:

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

  278.                 ast->sub_packet_size > ast->audio_framesize)

  279.                 return AVERROR_INVALIDDATA;

  280.             break;

  281.         case DEINT_ID_SIPR:

  282.         case DEINT_ID_INT0:

  283.         case DEINT_ID_VBRS:

  284.         case DEINT_ID_VBRF:

  285.             break;

  286.         default:

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

  288.             return AVERROR_INVALIDDATA;

  289.         }

  290. 

  291.         if (read_all) {

  292.             avio_r8(pb);

  293.             avio_r8(pb);

  294.             avio_r8(pb);

  295.             rm_read_metadata(s, 0);

  296.         }

  297.     }

  298.     return 0;

  299. }

  300. 

  301. int

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

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

  304. {

  305.     unsigned int v;

  306.     int size;

  307.     int64_t codec_pos;

  308.     int ret;

  309. 

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

  311.     codec_pos = avio_tell(pb);

  312.     v = avio_rb32(pb);

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

  314.         /* ra type header */

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

  316.             return -1;

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

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

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

  320.             return ret;

  321. 

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

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

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

  325.                                                 st->codec->codec_tag);

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

  327.         int stream_count, rule_count, property_count, i;

  328.         ff_free_stream(s, st);

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

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

  331.             goto skip;

  332.         }

  333.         stream_count = avio_rb16(pb);

  334.         avio_skip(pb, 6*stream_count);

  335.         rule_count = avio_rb16(pb);

  336.         avio_skip(pb, 2*rule_count);

  337.         property_count = avio_rb16(pb);

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

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

  340.             avio_rb32(pb);

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

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

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

  344.             }

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

  346.             switch(avio_rb32(pb)) {

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

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

  349.                 break;

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

  351.             }

  352.         }

  353.     } else {

  354.         int fps;

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

  356.         fail1:

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

  358.             goto skip;

  359.         }

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

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

  362.                                                st->codec->codec_tag);

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

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

  365.             goto fail1;

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

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

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

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

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

  371.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  372.         fps = avio_rb32(pb);

  373. 

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

  375.             return ret;

  376. 

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

  378.                   0x10000, fps, (1 << 30) - 1);

  379. #if FF_API_R_FRAME_RATE

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

  381. #endif

  382.     }

  383. 

  384. skip:

  385.     /* skip codec info */

  386.     size = avio_tell(pb) - codec_pos;

  387.     avio_skip(pb, codec_data_size - size);

  388. 

  389.     return 0;

  390. }

  391. 

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

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

  394. static int rm_read_index(AVFormatContext *s)

  395. {

  396.     AVIOContext *pb = s->pb;

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

  398.     AVStream *st;

  399. 

  400.     do {

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

  402.             return -1;

  403.         size     = avio_rb32(pb);

  404.         if (size < 20)

  405.             return -1;

  406.         avio_skip(pb, 2);

  407.         n_pkts   = avio_rb32(pb);

  408.         str_id   = avio_rb16(pb);

  409.         next_off = avio_rb32(pb);

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

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

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

  413.                 break;

  414.             }

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

  416.             av_log(s, AV_LOG_ERROR,

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

  418.                    str_id, avio_tell(pb));

  419.             goto skip;

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

  421.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  426.             goto skip;

  427.         }

  428. 

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

  430.             avio_skip(pb, 2);

  431.             pts = avio_rb32(pb);

  432.             pos = avio_rb32(pb);

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

  434. 

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

  436.         }

  437. 

  438. skip:

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

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

  441.             av_log(s, AV_LOG_ERROR,

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

  443.             return -1;

  444.         }

  445.     } while (next_off);

  446. 

  447.     return 0;

  448. }

  449. 

  450. static int rm_read_header_old(AVFormatContext *s)

  451. {

  452.     RMDemuxContext *rm = s->priv_data;

  453.     AVStream *st;

  454. 

  455.     rm->old_format = 1;

  456.     st = avformat_new_stream(s, NULL);

  457.     if (!st)

  458.         return -1;

  459.     st->priv_data = ff_rm_alloc_rmstream();

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

  461. }

  462. 

  463. static int rm_read_header(AVFormatContext *s)

  464. {

  465.     RMDemuxContext *rm = s->priv_data;

  466.     AVStream *st;

  467.     AVIOContext *pb = s->pb;

  468.     unsigned int tag;

  469.     int tag_size;

  470.     unsigned int start_time, duration;

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

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

  473.     int flags = 0;

  474. 

  475.     tag = avio_rl32(pb);

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

  477.         /* very old .ra format */

  478.         return rm_read_header_old(s);

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

  480.         return AVERROR(EIO);

  481.     }

  482. 

  483.     tag_size = avio_rb32(pb);

  484.     avio_skip(pb, tag_size - 8);

  485. 

  486.     for(;;) {

  487.         if (url_feof(pb))

  488.             return -1;

  489.         tag = avio_rl32(pb);

  490.         tag_size = avio_rb32(pb);

  491.         avio_rb16(pb);

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

  493.                 (tag      ) & 0xff,

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

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

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

  497.                 tag,

  498.                 tag_size);

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

  500.             return -1;

  501.         switch(tag) {

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

  503.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  516.             break;

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

  518.             rm_read_metadata(s, 1);

  519.             break;

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

  521.             st = avformat_new_stream(s, NULL);

  522.             if (!st)

  523.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  532.             st->start_time = start_time;

  533.             st->duration = duration;

  534.             if(duration>0)

  535.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  539.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  542.                 return -1;

  543.             break;

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

  545.             goto header_end;

  546.         default:

  547.             /* unknown tag: skip it */

  548.             avio_skip(pb, tag_size - 10);

  549.             break;

  550.         }

  551.     }

  552.  header_end:

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

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

  555.         rm->nb_packets = 3600 * 25;

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

  557. 

  558.     if (!data_off)

  559.         data_off = avio_tell(pb) - 18;

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

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

  562.         rm_read_index(s);

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

  564.     }

  565. 

  566.     return 0;

  567. }

  568. 

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

  570. {

  571.     int n, n1;

  572. 

  573.     n = avio_rb16(pb);

  574.     (*len)-=2;

  575.     n &= 0x7FFF;

  576.     if (n >= 0x4000) {

  577.         return n - 0x4000;

  578.     } else {

  579.         n1 = avio_rb16(pb);

  580.         (*len)-=2;

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

  582.     }

  583. }

  584. 

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

  586. #define RAW_PACKET_SIZE 1000

  587. 

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

  589.     RMDemuxContext *rm = s->priv_data;

  590.     AVIOContext *pb = s->pb;

  591.     AVStream *st;

  592.     uint32_t state=0xFFFFFFFF;

  593. 

  594.     while(!url_feof(pb)){

  595.         int len, num, i;

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

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

  598.             num= rm->current_stream;

  599.             len= rm->remaining_len;

  600.             *timestamp = AV_NOPTS_VALUE;

  601.             *flags= 0;

  602.         }else{

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

  604. 

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

  606.                 int n_pkts, expected_len;

  607.                 len = avio_rb32(pb);

  608.                 avio_skip(pb, 2);

  609.                 n_pkts = avio_rb32(pb);

  610.                 expected_len = 20 + n_pkts * 14;

  611.                 if (len == 20)

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

  613.                     len = expected_len;

  614.                 else if (len != expected_len)

  615.                     av_log(s, AV_LOG_WARNING,

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

  617.                            len, n_pkts, expected_len);

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

  619.                 if(len<0)

  620.                     continue;

  621.                 goto skip;

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

  623.                 av_log(s, AV_LOG_WARNING,

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

  625.             }

  626. 

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

  628.                 continue;

  629.             len=state - 12;

  630.             state= 0xFFFFFFFF;

  631. 

  632.             num = avio_rb16(pb);

  633.             *timestamp = avio_rb32(pb);

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

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

  636.         }

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

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

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

  640.                 break;

  641.         }

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

  643. skip:

  644.             /* skip packet if unknown number */

  645.             avio_skip(pb, len);

  646.             rm->remaining_len = 0;

  647.             continue;

  648.         }

  649.         *stream_index= i;

  650. 

  651.         return len;

  652.     }

  653.     return -1;

  654. }

  655. 

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

  657.                                    RMDemuxContext *rm, RMStream *vst,

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

  659.                                    int64_t *timestamp)

  660. {

  661.     int hdr;

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

  663.     int type;

  664. 

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

  666.     type = hdr >> 6;

  667. 

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

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

  670.     }

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

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

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

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

  675.     }

  676.     if(len<0)

  677.         return -1;

  678.     rm->remaining_len = len;

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

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

  681.             len= len2;

  682.             *timestamp = pos;

  683.         }

  684.         if(rm->remaining_len < len)

  685.             return -1;

  686.         rm->remaining_len -= len;

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

  688.             return AVERROR(EIO);

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

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

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

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

  693.         return 0;

  694.     }

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

  696. 

  697.     *pseq = seq;

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

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

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

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

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

  703.             return AVERROR(ENOMEM);

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

  705.         vst->cur_slice = 0;

  706.         vst->curpic_num = pic_num;

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

  708.     }

  709.     if(type == 2)

  710.         len = FFMIN(len, pos);

  711. 

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

  713.         return 1;

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

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

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

  717.         return 1;

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

  719.         return AVERROR(EIO);

  720.     vst->videobufpos += len;

  721.     rm->remaining_len-= len;

  722. 

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

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

  725.         *pkt= vst->pkt;

  726.         vst->pkt.data= NULL;

  727.         vst->pkt.size= 0;

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

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

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

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

  732.         pkt->pts = AV_NOPTS_VALUE;

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

  734.         vst->slices = 0;

  735.         return 0;

  736.     }

  737. 

  738.     return 1;

  739. }

  740. 

  741. static inline void

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

  743. {

  744.     uint8_t *ptr;

  745.     int j;

  746. 

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

  748.         ptr = pkt->data;

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

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

  751.             ptr += 2;

  752.         }

  753.     }

  754. }

  755. 

  756. int

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

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

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

  760. {

  761.     RMDemuxContext *rm = s->priv_data;

  762. 

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

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

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

  766.             return -1; //got partial frame

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

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

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

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

  771.             int x;

  772.             int sps = ast->sub_packet_size;

  773.             int cfs = ast->coded_framesize;

  774.             int h = ast->sub_packet_h;

  775.             int y = ast->sub_packet_cnt;

  776.             int w = ast->audio_framesize;

  777. 

  778.             if (flags & 2)

  779.                 y = ast->sub_packet_cnt = 0;

  780.             if (!y)

  781.                 ast->audiotimestamp = timestamp;

  782. 

  783.             switch (ast->deint_id) {

  784.                 case DEINT_ID_INT4:

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

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

  787.                     break;

  788.                 case DEINT_ID_GENR:

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

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

  791.                     break;

  792.                 case DEINT_ID_SIPR:

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

  794.                     break;

  795.             }

  796. 

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

  798.                 return -1;

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

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

  801. 

  802.              ast->sub_packet_cnt = 0;

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

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

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

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

  807.             int x;

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

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

  810.             if (ast->sub_packet_cnt) {

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

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

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

  814.                 ast->audiotimestamp = timestamp;

  815.             } else

  816.                 return -1;

  817.         } else {

  818.             av_get_packet(pb, pkt, len);

  819.             rm_ac3_swap_bytes(st, pkt);

  820.         }

  821.     } else

  822.         av_get_packet(pb, pkt, len);

  823. 

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

  825. 

  826. #if 0

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

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

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

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

  831. 

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

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

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

  835.         }

  836.     }

  837. #endif

  838. 

  839.     pkt->pts = timestamp;

  840.     if (flags & 2)

  841.         pkt->flags |= AV_PKT_FLAG_KEY;

  842. 

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

  844. }

  845. 

  846. int

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

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

  849. {

  850.     RMDemuxContext *rm = s->priv_data;

  851. 

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

  853. 

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

  855.         ast->deint_id == DEINT_ID_VBRS)

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

  857.     else {

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

  859.             return AVERROR(ENOMEM);

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

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

  862.                st->codec->block_align);

  863.     }

  864.     rm->audio_pkt_cnt--;

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

  866.         ast->audiotimestamp = AV_NOPTS_VALUE;

  867.         pkt->flags = AV_PKT_FLAG_KEY;

  868.     } else

  869.         pkt->flags = 0;

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

  871. 

  872.     return rm->audio_pkt_cnt;

  873. }

  874. 

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

  876. {

  877.     RMDemuxContext *rm = s->priv_data;

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

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

  880.     int64_t timestamp, pos;

  881.     int flags;

  882. 

  883.     for (;;) {

  884.         if (rm->audio_pkt_cnt) {

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

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

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

  888.             if(res < 0)

  889.                 return res;

  890.             flags = 0;

  891.         } else {

  892.             if (rm->old_format) {

  893.                 RMStream *ast;

  894. 

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

  896.                 ast = st->priv_data;

  897.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  902.             } else {

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

  904.                 if (len > 0)

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

  906.             }

  907. 

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

  909.                 return AVERROR(EIO);

  910. 

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

  912.                                       &seq, flags, timestamp);

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

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

  915.             if (res)

  916.                 continue;

  917.         }

  918. 

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

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

  921.             av_free_packet(pkt);

  922.         } else

  923.             break;

  924.     }

  925. 

  926.     return 0;

  927. }

  928. 

  929. static int rm_read_close(AVFormatContext *s)

  930. {

  931.     int i;

  932. 

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

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

  935. 

  936.     return 0;

  937. }

  938. 

  939. static int rm_probe(AVProbeData *p)

  940. {

  941.     /* check file header */

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

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

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

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

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

  947.         return AVPROBE_SCORE_MAX;

  948.     else

  949.         return 0;

  950. }

  951. 

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

  953.                                int64_t *ppos, int64_t pos_limit)

  954. {

  955.     RMDemuxContext *rm = s->priv_data;

  956.     int64_t pos, dts;

  957.     int stream_index2, flags, len, h;

  958. 

  959.     pos = *ppos;

  960. 

  961.     if(rm->old_format)

  962.         return AV_NOPTS_VALUE;

  963. 

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

  965.         return AV_NOPTS_VALUE;

  966. 

  967.     rm->remaining_len=0;

  968.     for(;;){

  969.         int seq=1;

  970.         AVStream *st;

  971. 

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

  973.         if(len<0)

  974.             return AV_NOPTS_VALUE;

  975. 

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

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

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

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

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

  981.             }

  982.         }

  983. 

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

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

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

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

  988.             if(stream_index2 == stream_index)

  989.                 break;

  990.         }

  991. 

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

  993.     }

  994.     *ppos = pos;

  995.     return dts;

  996. }

  997. 

  998. AVInputFormat ff_rm_demuxer = {

  999.     .name           = "rm",

  1000.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1001.     .priv_data_size = sizeof(RMDemuxContext),

  1002.     .read_probe     = rm_probe,

  1003.     .read_header    = rm_read_header,

  1004.     .read_packet    = rm_read_packet,

  1005.     .read_close     = rm_read_close,

  1006.     .read_timestamp = rm_read_dts,

  1007. };

  1008. 

  1009. AVInputFormat ff_rdt_demuxer = {

  1010.     .name           = "rdt",

  1011.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1012.     .priv_data_size = sizeof(RMDemuxContext),

  1013.     .read_close     = rm_read_close,

  1014.     .flags          = AVFMT_NOFILE,

  1015. };