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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_get_extradata(avctx, pb, size) < 0)

  90.         return AVERROR(ENOMEM);

  91.     return 0;

  92. }

  93. 

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

  95. {

  96.     char buf[1024];

  97.     int i;

  98. 

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

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

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

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

  103.     }

  104. }

  105. 

  106. RMStream *ff_rm_alloc_rmstream (void)

  107. {

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

  109.     rms->curpic_num = -1;

  110.     return rms;

  111. }

  112. 

  113. void ff_rm_free_rmstream (RMStream *rms)

  114. {

  115.     av_free_packet(&rms->pkt);

  116. }

  117. 

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

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

  120. {

  121.     char buf[256];

  122.     uint32_t version;

  123.     int ret;

  124. 

  125.     /* ra type header */

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

  127.     if (version == 3) {

  128.         unsigned bytes_per_minute;

  129.         int header_size = avio_rb16(pb);

  130.         int64_t startpos = avio_tell(pb);

  131.         avio_skip(pb, 8);

  132.         bytes_per_minute = avio_rb16(pb);

  133.         avio_skip(pb, 4);

  134.         rm_read_metadata(s, pb, 0);

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

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

  137.             avio_r8(pb);

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

  139.         }

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

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

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

  143.         if (bytes_per_minute)

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

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

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

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

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

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

  150.         ast->deint_id = DEINT_ID_INT0;

  151.     } else {

  152.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  153.         int codecdata_length;

  154.         unsigned bytes_per_minute;

  155.         /* old version (4) */

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

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

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

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

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

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

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

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

  164.         bytes_per_minute = avio_rb32(pb);

  165.         if (version == 4) {

  166.             if (bytes_per_minute)

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

  168.         }

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

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

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

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

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

  174.         if (version == 5) {

  175.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  176.         }

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

  178.         avio_rb32(pb);

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

  180.         if (version == 5) {

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

  182.             avio_read(pb, buf, 4);

  183.             buf[4] = 0;

  184.         } else {

  185.             AV_WL32(buf, 0);

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

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

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

  189.         }

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

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

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

  193.                                                 st->codec->codec_tag);

  194. 

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

  196.         case AV_CODEC_ID_AC3:

  197.             st->need_parsing = AVSTREAM_PARSE_FULL;

  198.             break;

  199.         case AV_CODEC_ID_RA_288:

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

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

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

  203.             break;

  204.         case AV_CODEC_ID_COOK:

  205.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  206.         case AV_CODEC_ID_ATRAC3:

  207.         case AV_CODEC_ID_SIPR:

  208.             if (read_all) {

  209.                 codecdata_length = 0;

  210.             } else {

  211.                 avio_rb16(pb); avio_r8(pb);

  212.                 if (version == 5)

  213.                     avio_r8(pb);

  214.                 codecdata_length = avio_rb32(pb);

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

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

  217.                     return -1;

  218.                 }

  219.             }

  220. 

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

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

  223.                 if (flavor > 3) {

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

  225.                            flavor);

  226.                     return -1;

  227.                 }

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

  229.             } else {

  230.                 if(sub_packet_size <= 0){

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

  232.                     return -1;

  233.                 }

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

  235.             }

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

  237.                 return ret;

  238. 

  239.             break;

  240.         case AV_CODEC_ID_AAC:

  241.             avio_rb16(pb); avio_r8(pb);

  242.             if (version == 5)

  243.                 avio_r8(pb);

  244.             codecdata_length = avio_rb32(pb);

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

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

  247.                 return -1;

  248.             }

  249.             if (codecdata_length >= 1) {

  250.                 avio_r8(pb);

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

  252.                     return ret;

  253.             }

  254.             break;

  255.         default:

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

  257.         }

  258.         switch (ast->deint_id) {

  259.         case DEINT_ID_INT4:

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

  261.                 sub_packet_h <= 1 ||

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

  263.                 return AVERROR_INVALIDDATA;

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

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

  266.                 return AVERROR_INVALIDDATA;

  267.             }

  268.             break;

  269.         case DEINT_ID_GENR:

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

  271.                 ast->sub_packet_size > ast->audio_framesize)

  272.                 return AVERROR_INVALIDDATA;

  273.             break;

  274.         case DEINT_ID_SIPR:

  275.         case DEINT_ID_INT0:

  276.         case DEINT_ID_VBRS:

  277.         case DEINT_ID_VBRF:

  278.             break;

  279.         default:

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

  281.             return AVERROR_INVALIDDATA;

  282.         }

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

  284.             ast->deint_id == DEINT_ID_GENR ||

  285.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  289.                 return AVERROR_INVALIDDATA;

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

  291.                 return AVERROR(ENOMEM);

  292.         }

  293. 

  294.         if (read_all) {

  295.             avio_r8(pb);

  296.             avio_r8(pb);

  297.             avio_r8(pb);

  298.             rm_read_metadata(s, pb, 0);

  299.         }

  300.     }

  301.     return 0;

  302. }

  303. 

  304. int

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

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

  307. {

  308.     unsigned int v;

  309.     int size;

  310.     int64_t codec_pos;

  311.     int ret;

  312. 

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

  314.     codec_pos = avio_tell(pb);

  315.     v = avio_rb32(pb);

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

  317.         /* ra type header */

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

  319.             return -1;

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

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

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

  323.             return ret;

  324. 

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

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

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

  328.                                                 st->codec->codec_tag);

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

  330.         int stream_count, rule_count, property_count, i;

  331.         ff_free_stream(s, st);

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

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

  334.             goto skip;

  335.         }

  336.         stream_count = avio_rb16(pb);

  337.         avio_skip(pb, 6*stream_count);

  338.         rule_count = avio_rb16(pb);

  339.         avio_skip(pb, 2*rule_count);

  340.         property_count = avio_rb16(pb);

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

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

  343.             avio_rb32(pb);

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

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

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

  347.             }

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

  349.             switch(avio_rb32(pb)) {

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

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

  352.                 break;

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

  354.             }

  355.         }

  356.     } else {

  357.         int fps;

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

  359.         fail1:

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

  361.             goto skip;

  362.         }

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

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

  365.                                                st->codec->codec_tag);

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

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

  368.             goto fail1;

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

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

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

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

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

  374.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  375.         fps = avio_rb32(pb);

  376. 

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

  378.             return ret;

  379. 

  380.         if (fps > 0) {

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

  382.                       0x10000, fps, (1 << 30) - 1);

  383. #if FF_API_R_FRAME_RATE

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

  385. #endif

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

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

  388.             return AVERROR_INVALIDDATA;

  389.         }

  390.     }

  391. 

  392. skip:

  393.     /* skip codec info */

  394.     size = avio_tell(pb) - codec_pos;

  395.     avio_skip(pb, codec_data_size - size);

  396. 

  397.     return 0;

  398. }

  399. 

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

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

  402. static int rm_read_index(AVFormatContext *s)

  403. {

  404.     AVIOContext *pb = s->pb;

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

  406.     AVStream *st;

  407. 

  408.     do {

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

  410.             return -1;

  411.         size     = avio_rb32(pb);

  412.         if (size < 20)

  413.             return -1;

  414.         avio_skip(pb, 2);

  415.         n_pkts   = avio_rb32(pb);

  416.         str_id   = avio_rb16(pb);

  417.         next_off = avio_rb32(pb);

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

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

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

  421.                 break;

  422.             }

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

  424.             av_log(s, AV_LOG_ERROR,

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

  426.                    str_id, avio_tell(pb));

  427.             goto skip;

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

  429.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  434.             goto skip;

  435.         }

  436. 

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

  438.             avio_skip(pb, 2);

  439.             pts = avio_rb32(pb);

  440.             pos = avio_rb32(pb);

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

  442. 

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

  444.         }

  445. 

  446. skip:

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

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

  449.             av_log(s, AV_LOG_ERROR,

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

  451.             return -1;

  452.         }

  453.     } while (next_off);

  454. 

  455.     return 0;

  456. }

  457. 

  458. static int rm_read_header_old(AVFormatContext *s)

  459. {

  460.     RMDemuxContext *rm = s->priv_data;

  461.     AVStream *st;

  462. 

  463.     rm->old_format = 1;

  464.     st = avformat_new_stream(s, NULL);

  465.     if (!st)

  466.         return -1;

  467.     st->priv_data = ff_rm_alloc_rmstream();

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

  469. }

  470. 

  471. static int rm_read_header(AVFormatContext *s)

  472. {

  473.     RMDemuxContext *rm = s->priv_data;

  474.     AVStream *st;

  475.     AVIOContext *pb = s->pb;

  476.     unsigned int tag;

  477.     int tag_size;

  478.     unsigned int start_time, duration;

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

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

  481.     int flags = 0;

  482. 

  483.     tag = avio_rl32(pb);

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

  485.         /* very old .ra format */

  486.         return rm_read_header_old(s);

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

  488.         return AVERROR(EIO);

  489.     }

  490. 

  491.     tag_size = avio_rb32(pb);

  492.     avio_skip(pb, tag_size - 8);

  493. 

  494.     for(;;) {

  495.         if (url_feof(pb))

  496.             return -1;

  497.         tag = avio_rl32(pb);

  498.         tag_size = avio_rb32(pb);

  499.         avio_rb16(pb);

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

  501.                 (tag      ) & 0xff,

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

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

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

  505.                 tag,

  506.                 tag_size);

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

  508.             return -1;

  509.         switch(tag) {

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

  511.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  524.             break;

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

  526.             rm_read_metadata(s, pb, 1);

  527.             break;

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

  529.             st = avformat_new_stream(s, NULL);

  530.             if (!st)

  531.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  540.             st->start_time = start_time;

  541.             st->duration = duration;

  542.             if(duration>0)

  543.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  547.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  550.                 return -1;

  551.             break;

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

  553.             goto header_end;

  554.         default:

  555.             /* unknown tag: skip it */

  556.             avio_skip(pb, tag_size - 10);

  557.             break;

  558.         }

  559.     }

  560.  header_end:

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

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

  563.         rm->nb_packets = 3600 * 25;

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

  565. 

  566.     if (!data_off)

  567.         data_off = avio_tell(pb) - 18;

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

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

  570.         rm_read_index(s);

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

  572.     }

  573. 

  574.     return 0;

  575. }

  576. 

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

  578. {

  579.     int n, n1;

  580. 

  581.     n = avio_rb16(pb);

  582.     (*len)-=2;

  583.     n &= 0x7FFF;

  584.     if (n >= 0x4000) {

  585.         return n - 0x4000;

  586.     } else {

  587.         n1 = avio_rb16(pb);

  588.         (*len)-=2;

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

  590.     }

  591. }

  592. 

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

  594. #define RAW_PACKET_SIZE 1000

  595. 

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

  597.     RMDemuxContext *rm = s->priv_data;

  598.     AVIOContext *pb = s->pb;

  599.     AVStream *st;

  600.     uint32_t state=0xFFFFFFFF;

  601. 

  602.     while(!url_feof(pb)){

  603.         int len, num, i;

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

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

  606.             num= rm->current_stream;

  607.             len= rm->remaining_len;

  608.             *timestamp = AV_NOPTS_VALUE;

  609.             *flags= 0;

  610.         }else{

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

  612. 

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

  614.                 int n_pkts, expected_len;

  615.                 len = avio_rb32(pb);

  616.                 avio_skip(pb, 2);

  617.                 n_pkts = avio_rb32(pb);

  618.                 expected_len = 20 + n_pkts * 14;

  619.                 if (len == 20)

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

  621.                     len = expected_len;

  622.                 else if (len != expected_len)

  623.                     av_log(s, AV_LOG_WARNING,

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

  625.                            len, n_pkts, expected_len);

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

  627.                 if(len<0)

  628.                     continue;

  629.                 goto skip;

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

  631.                 av_log(s, AV_LOG_WARNING,

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

  633.             }

  634. 

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

  636.                 continue;

  637.             len=state - 12;

  638.             state= 0xFFFFFFFF;

  639. 

  640.             num = avio_rb16(pb);

  641.             *timestamp = avio_rb32(pb);

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

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

  644.         }

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

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

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

  648.                 break;

  649.         }

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

  651. skip:

  652.             /* skip packet if unknown number */

  653.             avio_skip(pb, len);

  654.             rm->remaining_len = 0;

  655.             continue;

  656.         }

  657.         *stream_index= i;

  658. 

  659.         return len;

  660.     }

  661.     return -1;

  662. }

  663. 

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

  665.                                    RMDemuxContext *rm, RMStream *vst,

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

  667.                                    int64_t *timestamp)

  668. {

  669.     int hdr;

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

  671.     int type;

  672.     int ret;

  673. 

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

  675.     type = hdr >> 6;

  676. 

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

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

  679.     }

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

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

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

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

  684.     }

  685.     if(len<0) {

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

  687.         return -1;

  688.     }

  689.     rm->remaining_len = len;

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

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

  692.             len= len2;

  693.             *timestamp = pos;

  694.         }

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

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

  697.             return -1;

  698.         }

  699.         rm->remaining_len -= len;

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

  701.             return AVERROR(EIO);

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

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

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

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

  706.             av_free_packet(pkt);

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

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

  709.         }

  710.         return 0;

  711.     }

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

  713. 

  714.     *pseq = seq;

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

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

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

  718.             return AVERROR_INVALIDDATA;

  719.         }

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

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

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

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

  724.             return AVERROR(ENOMEM);

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

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

  727.         vst->cur_slice = 0;

  728.         vst->curpic_num = pic_num;

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

  730.     }

  731.     if(type == 2)

  732.         len = FFMIN(len, pos);

  733. 

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

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

  736.         return 1;

  737.     }

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

  739.         return AVERROR(ENOMEM);

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

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

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

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

  744.         return 1;

  745.     }

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

  747.         return AVERROR(EIO);

  748.     vst->videobufpos += len;

  749.     rm->remaining_len-= len;

  750. 

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

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

  753.         *pkt= vst->pkt;

  754.         vst->pkt.data= NULL;

  755.         vst->pkt.size= 0;

  756.         vst->pkt.buf = NULL;

  757. #if FF_API_DESTRUCT_PACKET

  758. FF_DISABLE_DEPRECATION_WARNINGS

  759.         vst->pkt.destruct = NULL;

  760. FF_ENABLE_DEPRECATION_WARNINGS

  761. #endif

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

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

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

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

  766.         pkt->pts = AV_NOPTS_VALUE;

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

  768.         vst->slices = 0;

  769.         return 0;

  770.     }

  771. 

  772.     return 1;

  773. }

  774. 

  775. static inline void

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

  777. {

  778.     uint8_t *ptr;

  779.     int j;

  780. 

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

  782.         ptr = pkt->data;

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

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

  785.             ptr += 2;

  786.         }

  787.     }

  788. }

  789. 

  790. int

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

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

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

  794. {

  795.     RMDemuxContext *rm = s->priv_data;

  796.     int ret;

  797. 

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

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

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

  801.         if(ret)

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

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

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

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

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

  807.             int x;

  808.             int sps = ast->sub_packet_size;

  809.             int cfs = ast->coded_framesize;

  810.             int h = ast->sub_packet_h;

  811.             int y = ast->sub_packet_cnt;

  812.             int w = ast->audio_framesize;

  813. 

  814.             if (flags & 2)

  815.                 y = ast->sub_packet_cnt = 0;

  816.             if (!y)

  817.                 ast->audiotimestamp = timestamp;

  818. 

  819.             switch (ast->deint_id) {

  820.                 case DEINT_ID_INT4:

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

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

  823.                     break;

  824.                 case DEINT_ID_GENR:

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

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

  827.                     break;

  828.                 case DEINT_ID_SIPR:

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

  830.                     break;

  831.             }

  832. 

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

  834.                 return -1;

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

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

  837. 

  838.              ast->sub_packet_cnt = 0;

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

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

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

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

  843.             int x;

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

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

  846.             if (ast->sub_packet_cnt) {

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

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

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

  850.                 ast->audiotimestamp = timestamp;

  851.             } else

  852.                 return -1;

  853.         } else {

  854.             av_get_packet(pb, pkt, len);

  855.             rm_ac3_swap_bytes(st, pkt);

  856.         }

  857.     } else

  858.         av_get_packet(pb, pkt, len);

  859. 

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

  861. 

  862. #if 0

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

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

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

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

  867. 

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

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

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

  871.         }

  872.     }

  873. #endif

  874. 

  875.     pkt->pts = timestamp;

  876.     if (flags & 2)

  877.         pkt->flags |= AV_PKT_FLAG_KEY;

  878. 

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

  880. }

  881. 

  882. int

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

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

  885. {

  886.     RMDemuxContext *rm = s->priv_data;

  887. 

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

  889. 

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

  891.         ast->deint_id == DEINT_ID_VBRS)

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

  893.     else {

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

  895.             return AVERROR(ENOMEM);

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

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

  898.                st->codec->block_align);

  899.     }

  900.     rm->audio_pkt_cnt--;

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

  902.         ast->audiotimestamp = AV_NOPTS_VALUE;

  903.         pkt->flags = AV_PKT_FLAG_KEY;

  904.     } else

  905.         pkt->flags = 0;

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

  907. 

  908.     return rm->audio_pkt_cnt;

  909. }

  910. 

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

  912. {

  913.     RMDemuxContext *rm = s->priv_data;

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

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

  916.     int64_t timestamp, pos;

  917.     int flags;

  918. 

  919.     for (;;) {

  920.         if (rm->audio_pkt_cnt) {

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

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

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

  924.             if(res < 0)

  925.                 return res;

  926.             flags = 0;

  927.         } else {

  928.             if (rm->old_format) {

  929.                 RMStream *ast;

  930. 

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

  932.                 ast = st->priv_data;

  933.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  938.             } else {

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

  940.                 if (len > 0)

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

  942.             }

  943. 

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

  945.                 return AVERROR(EIO);

  946. 

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

  948.                                       &seq, flags, timestamp);

  949.             if (res < -1)

  950.                 return res;

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

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

  953.             if (res)

  954.                 continue;

  955.         }

  956. 

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

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

  959.             av_free_packet(pkt);

  960.         } else

  961.             break;

  962.     }

  963. 

  964.     return 0;

  965. }

  966. 

  967. static int rm_read_close(AVFormatContext *s)

  968. {

  969.     int i;

  970. 

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

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

  973. 

  974.     return 0;

  975. }

  976. 

  977. static int rm_probe(AVProbeData *p)

  978. {

  979.     /* check file header */

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

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

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

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

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

  985.         return AVPROBE_SCORE_MAX;

  986.     else

  987.         return 0;

  988. }

  989. 

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

  991.                                int64_t *ppos, int64_t pos_limit)

  992. {

  993.     RMDemuxContext *rm = s->priv_data;

  994.     int64_t pos, dts;

  995.     int stream_index2, flags, len, h;

  996. 

  997.     pos = *ppos;

  998. 

  999.     if(rm->old_format)

  1000.         return AV_NOPTS_VALUE;

  1001. 

  1002.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1003.         return AV_NOPTS_VALUE;

  1004. 

  1005.     rm->remaining_len=0;

  1006.     for(;;){

  1007.         int seq=1;

  1008.         AVStream *st;

  1009. 

  1010.         len=sync(s, &dts, &flags, &stream_index2, &pos);

  1011.         if(len<0)

  1012.             return AV_NOPTS_VALUE;

  1013. 

  1014.         st = s->streams[stream_index2];

  1015.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

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

  1017.             if(!(h & 0x40)){

  1018.                 seq = avio_r8(s->pb); len--;

  1019.             }

  1020.         }

  1021. 

  1022.         if((flags&2) && (seq&0x7F) == 1){

  1023.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  1024.                     flags, stream_index2, stream_index, dts, seq);

  1025.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  1026.             if(stream_index2 == stream_index)

  1027.                 break;

  1028.         }

  1029. 

  1030.         avio_skip(s->pb, len);

  1031.     }

  1032.     *ppos = pos;

  1033.     return dts;

  1034. }

  1035. 

  1036. static int rm_read_seek(AVFormatContext *s, int stream_index,

  1037.                         int64_t pts, int flags)

  1038. {

  1039.     RMDemuxContext *rm = s->priv_data;

  1040. 

  1041.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1042.         return -1;

  1043.     rm->audio_pkt_cnt = 0;

  1044.     return 0;

  1045. }

  1046. 

  1047. 

  1048. AVInputFormat ff_rm_demuxer = {

  1049.     .name           = "rm",

  1050.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1051.     .priv_data_size = sizeof(RMDemuxContext),

  1052.     .read_probe     = rm_probe,

  1053.     .read_header    = rm_read_header,

  1054.     .read_packet    = rm_read_packet,

  1055.     .read_close     = rm_read_close,

  1056.     .read_timestamp = rm_read_dts,

  1057.     .read_seek      = rm_read_seek,

  1058. };

  1059. 

  1060. AVInputFormat ff_rdt_demuxer = {

  1061.     .name           = "rdt",

  1062.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1063.     .priv_data_size = sizeof(RMDemuxContext),

  1064.     .read_close     = rm_read_close,

  1065.     .flags          = AVFMT_NOFILE,

  1066. };