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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/internal.h"

  26. #include "libavutil/intreadwrite.h"

  27. #include "libavutil/dict.h"

  28. #include "avformat.h"

  29. #include "avio_internal.h"

  30. #include "internal.h"

  31. #include "rmsipr.h"

  32. #include "rm.h"

  33. 

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

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

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

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

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

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

  40. 

  41. struct RMStream {

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

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

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

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

  46.     int cur_slice, slices;

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

  48.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  55. };

  56. 

  57. typedef struct {

  58.     int nb_packets;

  59.     int old_format;

  60.     int current_stream;

  61.     int remaining_len;

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

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

  64. } RMDemuxContext;

  65. 

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

  67. {

  68.     int i;

  69.     char *q, r;

  70. 

  71.     q = buf;

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

  73.         r = avio_r8(pb);

  74.         if (i < buf_size - 1)

  75.             *q++ = r;

  76.     }

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

  78. }

  79. 

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

  81. {

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

  83. }

  84. 

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

  86. {

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

  88.         return -1;

  89.     if (ff_alloc_extradata(avctx, size))

  90.         return AVERROR(ENOMEM);

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

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

  93.         return AVERROR(EIO);

  94.     return 0;

  95. }

  96. 

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

  98. {

  99.     char buf[1024];

  100.     int i;

  101. 

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

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

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

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

  106.     }

  107. }

  108. 

  109. RMStream *ff_rm_alloc_rmstream (void)

  110. {

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

  112.     rms->curpic_num = -1;

  113.     return rms;

  114. }

  115. 

  116. void ff_rm_free_rmstream (RMStream *rms)

  117. {

  118.     av_free_packet(&rms->pkt);

  119. }

  120. 

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

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

  123. {

  124.     char buf[256];

  125.     uint32_t version;

  126.     int ret;

  127. 

  128.     /* ra type header */

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

  130.     if (version == 3) {

  131.         unsigned bytes_per_minute;

  132.         int header_size = avio_rb16(pb);

  133.         int64_t startpos = avio_tell(pb);

  134.         avio_skip(pb, 8);

  135.         bytes_per_minute = avio_rb16(pb);

  136.         avio_skip(pb, 4);

  137.         rm_read_metadata(s, pb, 0);

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

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

  140.             avio_r8(pb);

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

  142.         }

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

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

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

  146.         if (bytes_per_minute)

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

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

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

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

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

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

  153.         ast->deint_id = DEINT_ID_INT0;

  154.     } else {

  155.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  156.         int codecdata_length;

  157.         unsigned bytes_per_minute;

  158.         /* old version (4) */

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

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

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

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

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

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

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

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

  167.         bytes_per_minute = avio_rb32(pb);

  168.         if (version == 4) {

  169.             if (bytes_per_minute)

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

  171.         }

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

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

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

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

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

  177.         if (version == 5) {

  178.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  179.         }

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

  181.         avio_rb32(pb);

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

  183.         if (version == 5) {

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

  185.             avio_read(pb, buf, 4);

  186.             buf[4] = 0;

  187.         } else {

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

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

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

  191.         }

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

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

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

  195.                                                 st->codec->codec_tag);

  196. 

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

  198.         case AV_CODEC_ID_AC3:

  199.             st->need_parsing = AVSTREAM_PARSE_FULL;

  200.             break;

  201.         case AV_CODEC_ID_RA_288:

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

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

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

  205.             break;

  206.         case AV_CODEC_ID_COOK:

  207.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  208.         case AV_CODEC_ID_ATRAC3:

  209.         case AV_CODEC_ID_SIPR:

  210.             if (read_all) {

  211.                 codecdata_length = 0;

  212.             } else {

  213.                 avio_rb16(pb); avio_r8(pb);

  214.                 if (version == 5)

  215.                     avio_r8(pb);

  216.                 codecdata_length = avio_rb32(pb);

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

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

  219.                     return -1;

  220.                 }

  221.             }

  222. 

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

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

  225.                 if (flavor > 3) {

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

  227.                            flavor);

  228.                     return -1;

  229.                 }

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

  231.             } else {

  232.                 if(sub_packet_size <= 0){

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

  234.                     return -1;

  235.                 }

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

  237.             }

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

  239.                 return ret;

  240. 

  241.             break;

  242.         case AV_CODEC_ID_AAC:

  243.             avio_rb16(pb); avio_r8(pb);

  244.             if (version == 5)

  245.                 avio_r8(pb);

  246.             codecdata_length = avio_rb32(pb);

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

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

  249.                 return -1;

  250.             }

  251.             if (codecdata_length >= 1) {

  252.                 avio_r8(pb);

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

  254.                     return ret;

  255.             }

  256.             break;

  257.         default:

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

  259.         }

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

  261.             ast->deint_id == DEINT_ID_GENR ||

  262.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  266.                 return AVERROR_INVALIDDATA;

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

  268.                 return AVERROR(ENOMEM);

  269.         }

  270.         switch (ast->deint_id) {

  271.         case DEINT_ID_INT4:

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

  273.                 sub_packet_h <= 1 ||

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

  275.                 return AVERROR_INVALIDDATA;

  276.             break;

  277.         case DEINT_ID_GENR:

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

  279.                 ast->sub_packet_size > ast->audio_framesize)

  280.                 return AVERROR_INVALIDDATA;

  281.             break;

  282.         case DEINT_ID_SIPR:

  283.         case DEINT_ID_INT0:

  284.         case DEINT_ID_VBRS:

  285.         case DEINT_ID_VBRF:

  286.             break;

  287.         default:

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

  289.             return AVERROR_INVALIDDATA;

  290.         }

  291. 

  292.         if (read_all) {

  293.             avio_r8(pb);

  294.             avio_r8(pb);

  295.             avio_r8(pb);

  296.             rm_read_metadata(s, pb, 0);

  297.         }

  298.     }

  299.     return 0;

  300. }

  301. 

  302. int

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

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

  305. {

  306.     unsigned int v;

  307.     int size;

  308.     int64_t codec_pos;

  309.     int ret;

  310. 

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

  312.     codec_pos = avio_tell(pb);

  313.     v = avio_rb32(pb);

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

  315.         /* ra type header */

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

  317.             return -1;

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

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

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

  321.             return ret;

  322. 

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

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

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

  326.                                                 st->codec->codec_tag);

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

  328.         int stream_count, rule_count, property_count, i;

  329.         ff_free_stream(s, st);

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

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

  332.             goto skip;

  333.         }

  334.         stream_count = avio_rb16(pb);

  335.         avio_skip(pb, 6*stream_count);

  336.         rule_count = avio_rb16(pb);

  337.         avio_skip(pb, 2*rule_count);

  338.         property_count = avio_rb16(pb);

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

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

  341.             avio_rb32(pb);

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

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

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

  345.             }

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

  347.             switch(avio_rb32(pb)) {

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

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

  350.                 break;

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

  352.             }

  353.         }

  354.     } else {

  355.         int fps;

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

  357.         fail1:

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

  359.             goto skip;

  360.         }

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

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

  363.                                                st->codec->codec_tag);

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

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

  366.             goto fail1;

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

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

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

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

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

  372.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  373.         fps = avio_rb32(pb);

  374. 

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

  376.             return ret;

  377. 

  378.         if (fps > 0) {

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

  380.                       0x10000, fps, (1 << 30) - 1);

  381. #if FF_API_R_FRAME_RATE

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

  383. #endif

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

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

  386.             return AVERROR_INVALIDDATA;

  387.         }

  388.     }

  389. 

  390. skip:

  391.     /* skip codec info */

  392.     size = avio_tell(pb) - codec_pos;

  393.     avio_skip(pb, codec_data_size - size);

  394. 

  395.     return 0;

  396. }

  397. 

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

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

  400. static int rm_read_index(AVFormatContext *s)

  401. {

  402.     AVIOContext *pb = s->pb;

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

  404.     AVStream *st;

  405. 

  406.     do {

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

  408.             return -1;

  409.         size     = avio_rb32(pb);

  410.         if (size < 20)

  411.             return -1;

  412.         avio_skip(pb, 2);

  413.         n_pkts   = avio_rb32(pb);

  414.         str_id   = avio_rb16(pb);

  415.         next_off = avio_rb32(pb);

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

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

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

  419.                 break;

  420.             }

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

  422.             av_log(s, AV_LOG_ERROR,

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

  424.                    str_id, avio_tell(pb));

  425.             goto skip;

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

  427.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  432.             goto skip;

  433.         }

  434. 

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

  436.             avio_skip(pb, 2);

  437.             pts = avio_rb32(pb);

  438.             pos = avio_rb32(pb);

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

  440. 

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

  442.         }

  443. 

  444. skip:

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

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

  447.             av_log(s, AV_LOG_ERROR,

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

  449.             return -1;

  450.         }

  451.     } while (next_off);

  452. 

  453.     return 0;

  454. }

  455. 

  456. static int rm_read_header_old(AVFormatContext *s)

  457. {

  458.     RMDemuxContext *rm = s->priv_data;

  459.     AVStream *st;

  460. 

  461.     rm->old_format = 1;

  462.     st = avformat_new_stream(s, NULL);

  463.     if (!st)

  464.         return -1;

  465.     st->priv_data = ff_rm_alloc_rmstream();

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

  467. }

  468. 

  469. static int rm_read_header(AVFormatContext *s)

  470. {

  471.     RMDemuxContext *rm = s->priv_data;

  472.     AVStream *st;

  473.     AVIOContext *pb = s->pb;

  474.     unsigned int tag;

  475.     int tag_size;

  476.     unsigned int start_time, duration;

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

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

  479.     int flags = 0;

  480. 

  481.     tag = avio_rl32(pb);

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

  483.         /* very old .ra format */

  484.         return rm_read_header_old(s);

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

  486.         return AVERROR(EIO);

  487.     }

  488. 

  489.     tag_size = avio_rb32(pb);

  490.     avio_skip(pb, tag_size - 8);

  491. 

  492.     for(;;) {

  493.         if (url_feof(pb))

  494.             return -1;

  495.         tag = avio_rl32(pb);

  496.         tag_size = avio_rb32(pb);

  497.         avio_rb16(pb);

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

  499.                 (tag      ) & 0xff,

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

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

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

  503.                 tag,

  504.                 tag_size);

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

  506.             return -1;

  507.         switch(tag) {

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

  509.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  522.             break;

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

  524.             rm_read_metadata(s, pb, 1);

  525.             break;

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

  527.             st = avformat_new_stream(s, NULL);

  528.             if (!st)

  529.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  538.             st->start_time = start_time;

  539.             st->duration = duration;

  540.             if(duration>0)

  541.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  545.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  548.                 return -1;

  549.             break;

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

  551.             goto header_end;

  552.         default:

  553.             /* unknown tag: skip it */

  554.             avio_skip(pb, tag_size - 10);

  555.             break;

  556.         }

  557.     }

  558.  header_end:

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

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

  561.         rm->nb_packets = 3600 * 25;

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

  563. 

  564.     if (!data_off)

  565.         data_off = avio_tell(pb) - 18;

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

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

  568.         rm_read_index(s);

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

  570.     }

  571. 

  572.     return 0;

  573. }

  574. 

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

  576. {

  577.     int n, n1;

  578. 

  579.     n = avio_rb16(pb);

  580.     (*len)-=2;

  581.     n &= 0x7FFF;

  582.     if (n >= 0x4000) {

  583.         return n - 0x4000;

  584.     } else {

  585.         n1 = avio_rb16(pb);

  586.         (*len)-=2;

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

  588.     }

  589. }

  590. 

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

  592. #define RAW_PACKET_SIZE 1000

  593. 

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

  595.     RMDemuxContext *rm = s->priv_data;

  596.     AVIOContext *pb = s->pb;

  597.     AVStream *st;

  598.     uint32_t state=0xFFFFFFFF;

  599. 

  600.     while(!url_feof(pb)){

  601.         int len, num, i;

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

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

  604.             num= rm->current_stream;

  605.             len= rm->remaining_len;

  606.             *timestamp = AV_NOPTS_VALUE;

  607.             *flags= 0;

  608.         }else{

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

  610. 

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

  612.                 int n_pkts, expected_len;

  613.                 len = avio_rb32(pb);

  614.                 avio_skip(pb, 2);

  615.                 n_pkts = avio_rb32(pb);

  616.                 expected_len = 20 + n_pkts * 14;

  617.                 if (len == 20)

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

  619.                     len = expected_len;

  620.                 else if (len != expected_len)

  621.                     av_log(s, AV_LOG_WARNING,

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

  623.                            len, n_pkts, expected_len);

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

  625.                 if(len<0)

  626.                     continue;

  627.                 goto skip;

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

  629.                 av_log(s, AV_LOG_WARNING,

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

  631.             }

  632. 

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

  634.                 continue;

  635.             len=state - 12;

  636.             state= 0xFFFFFFFF;

  637. 

  638.             num = avio_rb16(pb);

  639.             *timestamp = avio_rb32(pb);

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

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

  642.         }

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

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

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

  646.                 break;

  647.         }

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

  649. skip:

  650.             /* skip packet if unknown number */

  651.             avio_skip(pb, len);

  652.             rm->remaining_len = 0;

  653.             continue;

  654.         }

  655.         *stream_index= i;

  656. 

  657.         return len;

  658.     }

  659.     return -1;

  660. }

  661. 

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

  663.                                    RMDemuxContext *rm, RMStream *vst,

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

  665.                                    int64_t *timestamp)

  666. {

  667.     int hdr;

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

  669.     int type;

  670.     int ret;

  671. 

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

  673.     type = hdr >> 6;

  674. 

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

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

  677.     }

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

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

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

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

  682.     }

  683.     if(len<0) {

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

  685.         return -1;

  686.     }

  687.     rm->remaining_len = len;

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

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

  690.             len= len2;

  691.             *timestamp = pos;

  692.         }

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

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

  695.             return -1;

  696.         }

  697.         rm->remaining_len -= len;

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

  699.             return AVERROR(EIO);

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

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

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

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

  704.             av_free_packet(pkt);

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

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

  707.         }

  708.         return 0;

  709.     }

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

  711. 

  712.     *pseq = seq;

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

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

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

  716.             return AVERROR_INVALIDDATA;

  717.         }

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

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

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

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

  722.             return AVERROR(ENOMEM);

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

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

  725.         vst->cur_slice = 0;

  726.         vst->curpic_num = pic_num;

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

  728.     }

  729.     if(type == 2)

  730.         len = FFMIN(len, pos);

  731. 

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

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

  734.         return 1;

  735.     }

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

  737.         return AVERROR(ENOMEM);

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

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

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

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

  742.         return 1;

  743.     }

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

  745.         return AVERROR(EIO);

  746.     vst->videobufpos += len;

  747.     rm->remaining_len-= len;

  748. 

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

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

  751.         *pkt= vst->pkt;

  752.         vst->pkt.data= NULL;

  753.         vst->pkt.size= 0;

  754.         vst->pkt.buf = NULL;

  755. #if FF_API_DESTRUCT_PACKET

  756. FF_DISABLE_DEPRECATION_WARNINGS

  757.         vst->pkt.destruct = NULL;

  758. FF_ENABLE_DEPRECATION_WARNINGS

  759. #endif

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

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

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

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

  764.         pkt->pts = AV_NOPTS_VALUE;

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

  766.         vst->slices = 0;

  767.         return 0;

  768.     }

  769. 

  770.     return 1;

  771. }

  772. 

  773. static inline void

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

  775. {

  776.     uint8_t *ptr;

  777.     int j;

  778. 

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

  780.         ptr = pkt->data;

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

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

  783.             ptr += 2;

  784.         }

  785.     }

  786. }

  787. 

  788. int

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

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

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

  792. {

  793.     RMDemuxContext *rm = s->priv_data;

  794.     int ret;

  795. 

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

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

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

  799.         if(ret)

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

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

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

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

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

  805.             int x;

  806.             int sps = ast->sub_packet_size;

  807.             int cfs = ast->coded_framesize;

  808.             int h = ast->sub_packet_h;

  809.             int y = ast->sub_packet_cnt;

  810.             int w = ast->audio_framesize;

  811. 

  812.             if (flags & 2)

  813.                 y = ast->sub_packet_cnt = 0;

  814.             if (!y)

  815.                 ast->audiotimestamp = timestamp;

  816. 

  817.             switch (ast->deint_id) {

  818.                 case DEINT_ID_INT4:

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

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

  821.                     break;

  822.                 case DEINT_ID_GENR:

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

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

  825.                     break;

  826.                 case DEINT_ID_SIPR:

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

  828.                     break;

  829.             }

  830. 

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

  832.                 return -1;

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

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

  835. 

  836.              ast->sub_packet_cnt = 0;

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

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

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

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

  841.             int x;

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

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

  844.             if (ast->sub_packet_cnt) {

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

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

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

  848.                 ast->audiotimestamp = timestamp;

  849.             } else

  850.                 return -1;

  851.         } else {

  852.             av_get_packet(pb, pkt, len);

  853.             rm_ac3_swap_bytes(st, pkt);

  854.         }

  855.     } else

  856.         av_get_packet(pb, pkt, len);

  857. 

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

  859. 

  860. #if 0

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

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

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

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

  865. 

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

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

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

  869.         }

  870.     }

  871. #endif

  872. 

  873.     pkt->pts = timestamp;

  874.     if (flags & 2)

  875.         pkt->flags |= AV_PKT_FLAG_KEY;

  876. 

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

  878. }

  879. 

  880. int

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

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

  883. {

  884.     RMDemuxContext *rm = s->priv_data;

  885. 

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

  887. 

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

  889.         ast->deint_id == DEINT_ID_VBRS)

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

  891.     else {

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

  893.             return AVERROR(ENOMEM);

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

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

  896.                st->codec->block_align);

  897.     }

  898.     rm->audio_pkt_cnt--;

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

  900.         ast->audiotimestamp = AV_NOPTS_VALUE;

  901.         pkt->flags = AV_PKT_FLAG_KEY;

  902.     } else

  903.         pkt->flags = 0;

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

  905. 

  906.     return rm->audio_pkt_cnt;

  907. }

  908. 

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

  910. {

  911.     RMDemuxContext *rm = s->priv_data;

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

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

  914.     int64_t timestamp, pos;

  915.     int flags;

  916. 

  917.     for (;;) {

  918.         if (rm->audio_pkt_cnt) {

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

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

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

  922.             if(res < 0)

  923.                 return res;

  924.             flags = 0;

  925.         } else {

  926.             if (rm->old_format) {

  927.                 RMStream *ast;

  928. 

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

  930.                 ast = st->priv_data;

  931.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  936.             } else {

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

  938.                 if (len > 0)

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

  940.             }

  941. 

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

  943.                 return AVERROR(EIO);

  944. 

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

  946.                                       &seq, flags, timestamp);

  947.             if (res < -1)

  948.                 return res;

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

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

  951.             if (res)

  952.                 continue;

  953.         }

  954. 

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

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

  957.             av_free_packet(pkt);

  958.         } else

  959.             break;

  960.     }

  961. 

  962.     return 0;

  963. }

  964. 

  965. static int rm_read_close(AVFormatContext *s)

  966. {

  967.     int i;

  968. 

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

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

  971. 

  972.     return 0;

  973. }

  974. 

  975. static int rm_probe(AVProbeData *p)

  976. {

  977.     /* check file header */

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

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

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

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

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

  983.         return AVPROBE_SCORE_MAX;

  984.     else

  985.         return 0;

  986. }

  987. 

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

  989.                                int64_t *ppos, int64_t pos_limit)

  990. {

  991.     RMDemuxContext *rm = s->priv_data;

  992.     int64_t pos, dts;

  993.     int stream_index2, flags, len, h;

  994. 

  995.     pos = *ppos;

  996. 

  997.     if(rm->old_format)

  998.         return AV_NOPTS_VALUE;

  999. 

  1000.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1001.         return AV_NOPTS_VALUE;

  1002. 

  1003.     rm->remaining_len=0;

  1004.     for(;;){

  1005.         int seq=1;

  1006.         AVStream *st;

  1007. 

  1008.         len=sync(s, &dts, &flags, &stream_index2, &pos);

  1009.         if(len<0)

  1010.             return AV_NOPTS_VALUE;

  1011. 

  1012.         st = s->streams[stream_index2];

  1013.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1014.             h= avio_r8(s->pb); len--;

  1015.             if(!(h & 0x40)){

  1016.                 seq = avio_r8(s->pb); len--;

  1017.             }

  1018.         }

  1019. 

  1020.         if((flags&2) && (seq&0x7F) == 1){

  1021.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  1022.                     flags, stream_index2, stream_index, dts, seq);

  1023.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  1024.             if(stream_index2 == stream_index)

  1025.                 break;

  1026.         }

  1027. 

  1028.         avio_skip(s->pb, len);

  1029.     }

  1030.     *ppos = pos;

  1031.     return dts;

  1032. }

  1033. 

  1034. static int rm_read_seek(AVFormatContext *s, int stream_index,

  1035.                         int64_t pts, int flags)

  1036. {

  1037.     RMDemuxContext *rm = s->priv_data;

  1038. 

  1039.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1040.         return -1;

  1041.     rm->audio_pkt_cnt = 0;

  1042.     return 0;

  1043. }

  1044. 

  1045. 

  1046. AVInputFormat ff_rm_demuxer = {

  1047.     .name           = "rm",

  1048.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1049.     .priv_data_size = sizeof(RMDemuxContext),

  1050.     .read_probe     = rm_probe,

  1051.     .read_header    = rm_read_header,

  1052.     .read_packet    = rm_read_packet,

  1053.     .read_close     = rm_read_close,

  1054.     .read_timestamp = rm_read_dts,

  1055.     .read_seek      = rm_read_seek,

  1056. };

  1057. 

  1058. AVInputFormat ff_rdt_demuxer = {

  1059.     .name           = "rdt",

  1060.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1061.     .priv_data_size = sizeof(RMDemuxContext),

  1062.     .read_close     = rm_read_close,

  1063.     .flags          = AVFMT_NOFILE,

  1064. };