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

  259.             ast->deint_id == DEINT_ID_GENR ||

  260.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  264.                 return AVERROR_INVALIDDATA;

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

  266.                 return AVERROR(ENOMEM);

  267.         }

  268.         switch (ast->deint_id) {

  269.         case DEINT_ID_INT4:

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

  271.                 sub_packet_h <= 1 ||

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

  273.                 return AVERROR_INVALIDDATA;

  274.             break;

  275.         case DEINT_ID_GENR:

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

  277.                 ast->sub_packet_size > ast->audio_framesize)

  278.                 return AVERROR_INVALIDDATA;

  279.             break;

  280.         case DEINT_ID_SIPR:

  281.         case DEINT_ID_INT0:

  282.         case DEINT_ID_VBRS:

  283.         case DEINT_ID_VBRF:

  284.             break;

  285.         default:

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

  287.             return AVERROR_INVALIDDATA;

  288.         }

  289. 

  290.         if (read_all) {

  291.             avio_r8(pb);

  292.             avio_r8(pb);

  293.             avio_r8(pb);

  294.             rm_read_metadata(s, pb, 0);

  295.         }

  296.     }

  297.     return 0;

  298. }

  299. 

  300. int

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

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

  303. {

  304.     unsigned int v;

  305.     int size;

  306.     int64_t codec_pos;

  307.     int ret;

  308. 

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

  310.     codec_pos = avio_tell(pb);

  311.     v = avio_rb32(pb);

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

  313.         /* ra type header */

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

  315.             return -1;

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

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

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

  319.             return ret;

  320. 

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

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

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

  324.                                                 st->codec->codec_tag);

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

  326.         int stream_count, rule_count, property_count, i;

  327.         ff_free_stream(s, st);

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

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

  330.             goto skip;

  331.         }

  332.         stream_count = avio_rb16(pb);

  333.         avio_skip(pb, 6*stream_count);

  334.         rule_count = avio_rb16(pb);

  335.         avio_skip(pb, 2*rule_count);

  336.         property_count = avio_rb16(pb);

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

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

  339.             avio_rb32(pb);

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

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

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

  343.             }

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

  345.             switch(avio_rb32(pb)) {

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

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

  348.                 break;

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

  350.             }

  351.         }

  352.     } else {

  353.         int fps;

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

  355.         fail1:

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

  357.             goto skip;

  358.         }

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

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

  361.                                                st->codec->codec_tag);

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

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

  364.             goto fail1;

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

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

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

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

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

  370.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  371.         fps = avio_rb32(pb);

  372. 

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

  374.             return ret;

  375. 

  376.         if (fps > 0) {

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

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

  384.             return AVERROR_INVALIDDATA;

  385.         }

  386.     }

  387. 

  388. skip:

  389.     /* skip codec info */

  390.     size = avio_tell(pb) - codec_pos;

  391.     avio_skip(pb, codec_data_size - size);

  392. 

  393.     return 0;

  394. }

  395. 

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

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

  398. static int rm_read_index(AVFormatContext *s)

  399. {

  400.     AVIOContext *pb = s->pb;

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

  402.     AVStream *st;

  403. 

  404.     do {

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

  406.             return -1;

  407.         size     = avio_rb32(pb);

  408.         if (size < 20)

  409.             return -1;

  410.         avio_skip(pb, 2);

  411.         n_pkts   = avio_rb32(pb);

  412.         str_id   = avio_rb16(pb);

  413.         next_off = avio_rb32(pb);

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

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

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

  417.                 break;

  418.             }

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

  420.             av_log(s, AV_LOG_ERROR,

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

  422.                    str_id, avio_tell(pb));

  423.             goto skip;

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

  425.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  430.             goto skip;

  431.         }

  432. 

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

  434.             avio_skip(pb, 2);

  435.             pts = avio_rb32(pb);

  436.             pos = avio_rb32(pb);

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

  438. 

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

  440.         }

  441. 

  442. skip:

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

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

  445.             av_log(s, AV_LOG_ERROR,

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

  447.             return -1;

  448.         }

  449.     } while (next_off);

  450. 

  451.     return 0;

  452. }

  453. 

  454. static int rm_read_header_old(AVFormatContext *s)

  455. {

  456.     RMDemuxContext *rm = s->priv_data;

  457.     AVStream *st;

  458. 

  459.     rm->old_format = 1;

  460.     st = avformat_new_stream(s, NULL);

  461.     if (!st)

  462.         return -1;

  463.     st->priv_data = ff_rm_alloc_rmstream();

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

  465. }

  466. 

  467. static int rm_read_header(AVFormatContext *s)

  468. {

  469.     RMDemuxContext *rm = s->priv_data;

  470.     AVStream *st;

  471.     AVIOContext *pb = s->pb;

  472.     unsigned int tag;

  473.     int tag_size;

  474.     unsigned int start_time, duration;

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

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

  477.     int flags = 0;

  478. 

  479.     tag = avio_rl32(pb);

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

  481.         /* very old .ra format */

  482.         return rm_read_header_old(s);

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

  484.         return AVERROR(EIO);

  485.     }

  486. 

  487.     tag_size = avio_rb32(pb);

  488.     avio_skip(pb, tag_size - 8);

  489. 

  490.     for(;;) {

  491.         if (url_feof(pb))

  492.             return -1;

  493.         tag = avio_rl32(pb);

  494.         tag_size = avio_rb32(pb);

  495.         avio_rb16(pb);

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

  497.                 (tag      ) & 0xff,

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

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

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

  501.                 tag,

  502.                 tag_size);

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

  504.             return -1;

  505.         switch(tag) {

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

  507.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  520.             break;

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

  522.             rm_read_metadata(s, pb, 1);

  523.             break;

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

  525.             st = avformat_new_stream(s, NULL);

  526.             if (!st)

  527.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  536.             st->start_time = start_time;

  537.             st->duration = duration;

  538.             if(duration>0)

  539.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  543.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  546.                 return -1;

  547.             break;

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

  549.             goto header_end;

  550.         default:

  551.             /* unknown tag: skip it */

  552.             avio_skip(pb, tag_size - 10);

  553.             break;

  554.         }

  555.     }

  556.  header_end:

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

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

  559.         rm->nb_packets = 3600 * 25;

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

  561. 

  562.     if (!data_off)

  563.         data_off = avio_tell(pb) - 18;

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

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

  566.         rm_read_index(s);

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

  568.     }

  569. 

  570.     return 0;

  571. }

  572. 

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

  574. {

  575.     int n, n1;

  576. 

  577.     n = avio_rb16(pb);

  578.     (*len)-=2;

  579.     n &= 0x7FFF;

  580.     if (n >= 0x4000) {

  581.         return n - 0x4000;

  582.     } else {

  583.         n1 = avio_rb16(pb);

  584.         (*len)-=2;

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

  586.     }

  587. }

  588. 

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

  590. #define RAW_PACKET_SIZE 1000

  591. 

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

  593.     RMDemuxContext *rm = s->priv_data;

  594.     AVIOContext *pb = s->pb;

  595.     AVStream *st;

  596.     uint32_t state=0xFFFFFFFF;

  597. 

  598.     while(!url_feof(pb)){

  599.         int len, num, i;

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

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

  602.             num= rm->current_stream;

  603.             len= rm->remaining_len;

  604.             *timestamp = AV_NOPTS_VALUE;

  605.             *flags= 0;

  606.         }else{

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

  608. 

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

  610.                 int n_pkts, expected_len;

  611.                 len = avio_rb32(pb);

  612.                 avio_skip(pb, 2);

  613.                 n_pkts = avio_rb32(pb);

  614.                 expected_len = 20 + n_pkts * 14;

  615.                 if (len == 20)

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

  617.                     len = expected_len;

  618.                 else if (len != expected_len)

  619.                     av_log(s, AV_LOG_WARNING,

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

  621.                            len, n_pkts, expected_len);

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

  623.                 if(len<0)

  624.                     continue;

  625.                 goto skip;

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

  627.                 av_log(s, AV_LOG_WARNING,

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

  629.             }

  630. 

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

  632.                 continue;

  633.             len=state - 12;

  634.             state= 0xFFFFFFFF;

  635. 

  636.             num = avio_rb16(pb);

  637.             *timestamp = avio_rb32(pb);

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

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

  640.         }

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

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

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

  644.                 break;

  645.         }

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

  647. skip:

  648.             /* skip packet if unknown number */

  649.             avio_skip(pb, len);

  650.             rm->remaining_len = 0;

  651.             continue;

  652.         }

  653.         *stream_index= i;

  654. 

  655.         return len;

  656.     }

  657.     return -1;

  658. }

  659. 

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

  661.                                    RMDemuxContext *rm, RMStream *vst,

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

  663.                                    int64_t *timestamp)

  664. {

  665.     int hdr;

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

  667.     int type;

  668.     int ret;

  669. 

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

  671.     type = hdr >> 6;

  672. 

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

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

  675.     }

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

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

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

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

  680.     }

  681.     if(len<0) {

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

  683.         return -1;

  684.     }

  685.     rm->remaining_len = len;

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

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

  688.             len= len2;

  689.             *timestamp = pos;

  690.         }

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

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

  693.             return -1;

  694.         }

  695.         rm->remaining_len -= len;

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

  697.             return AVERROR(EIO);

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

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

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

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

  702.             av_free_packet(pkt);

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

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

  705.         }

  706.         return 0;

  707.     }

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

  709. 

  710.     *pseq = seq;

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

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

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

  714.             return AVERROR_INVALIDDATA;

  715.         }

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

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

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

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

  720.             return AVERROR(ENOMEM);

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

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

  723.         vst->cur_slice = 0;

  724.         vst->curpic_num = pic_num;

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

  726.     }

  727.     if(type == 2)

  728.         len = FFMIN(len, pos);

  729. 

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

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

  732.         return 1;

  733.     }

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

  735.         return AVERROR(ENOMEM);

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

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

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

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

  740.         return 1;

  741.     }

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

  743.         return AVERROR(EIO);

  744.     vst->videobufpos += len;

  745.     rm->remaining_len-= len;

  746. 

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

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

  749.         *pkt= vst->pkt;

  750.         vst->pkt.data= NULL;

  751.         vst->pkt.size= 0;

  752.         vst->pkt.buf = NULL;

  753. #if FF_API_DESTRUCT_PACKET

  754. FF_DISABLE_DEPRECATION_WARNINGS

  755.         vst->pkt.destruct = NULL;

  756. FF_ENABLE_DEPRECATION_WARNINGS

  757. #endif

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

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

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

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

  762.         pkt->pts = AV_NOPTS_VALUE;

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

  764.         vst->slices = 0;

  765.         return 0;

  766.     }

  767. 

  768.     return 1;

  769. }

  770. 

  771. static inline void

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

  773. {

  774.     uint8_t *ptr;

  775.     int j;

  776. 

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

  778.         ptr = pkt->data;

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

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

  781.             ptr += 2;

  782.         }

  783.     }

  784. }

  785. 

  786. int

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

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

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

  790. {

  791.     RMDemuxContext *rm = s->priv_data;

  792.     int ret;

  793. 

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

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

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

  797.         if(ret)

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

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

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

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

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

  803.             int x;

  804.             int sps = ast->sub_packet_size;

  805.             int cfs = ast->coded_framesize;

  806.             int h = ast->sub_packet_h;

  807.             int y = ast->sub_packet_cnt;

  808.             int w = ast->audio_framesize;

  809. 

  810.             if (flags & 2)

  811.                 y = ast->sub_packet_cnt = 0;

  812.             if (!y)

  813.                 ast->audiotimestamp = timestamp;

  814. 

  815.             switch (ast->deint_id) {

  816.                 case DEINT_ID_INT4:

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

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

  819.                     break;

  820.                 case DEINT_ID_GENR:

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

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

  823.                     break;

  824.                 case DEINT_ID_SIPR:

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

  826.                     break;

  827.             }

  828. 

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

  830.                 return -1;

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

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

  833. 

  834.              ast->sub_packet_cnt = 0;

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

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

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

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

  839.             int x;

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

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

  842.             if (ast->sub_packet_cnt) {

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

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

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

  846.                 ast->audiotimestamp = timestamp;

  847.             } else

  848.                 return -1;

  849.         } else {

  850.             av_get_packet(pb, pkt, len);

  851.             rm_ac3_swap_bytes(st, pkt);

  852.         }

  853.     } else

  854.         av_get_packet(pb, pkt, len);

  855. 

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

  857. 

  858. #if 0

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

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

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

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

  863. 

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

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

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

  867.         }

  868.     }

  869. #endif

  870. 

  871.     pkt->pts = timestamp;

  872.     if (flags & 2)

  873.         pkt->flags |= AV_PKT_FLAG_KEY;

  874. 

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

  876. }

  877. 

  878. int

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

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

  881. {

  882.     RMDemuxContext *rm = s->priv_data;

  883. 

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

  885. 

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

  887.         ast->deint_id == DEINT_ID_VBRS)

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

  889.     else {

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

  891.             return AVERROR(ENOMEM);

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

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

  894.                st->codec->block_align);

  895.     }

  896.     rm->audio_pkt_cnt--;

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

  898.         ast->audiotimestamp = AV_NOPTS_VALUE;

  899.         pkt->flags = AV_PKT_FLAG_KEY;

  900.     } else

  901.         pkt->flags = 0;

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

  903. 

  904.     return rm->audio_pkt_cnt;

  905. }

  906. 

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

  908. {

  909.     RMDemuxContext *rm = s->priv_data;

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

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

  912.     int64_t timestamp, pos;

  913.     int flags;

  914. 

  915.     for (;;) {

  916.         if (rm->audio_pkt_cnt) {

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

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

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

  920.             if(res < 0)

  921.                 return res;

  922.             flags = 0;

  923.         } else {

  924.             if (rm->old_format) {

  925.                 RMStream *ast;

  926. 

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

  928.                 ast = st->priv_data;

  929.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  934.             } else {

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

  936.                 if (len > 0)

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

  938.             }

  939. 

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

  941.                 return AVERROR(EIO);

  942. 

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

  944.                                       &seq, flags, timestamp);

  945.             if (res < -1)

  946.                 return res;

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

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

  949.             if (res)

  950.                 continue;

  951.         }

  952. 

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

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

  955.             av_free_packet(pkt);

  956.         } else

  957.             break;

  958.     }

  959. 

  960.     return 0;

  961. }

  962. 

  963. static int rm_read_close(AVFormatContext *s)

  964. {

  965.     int i;

  966. 

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

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

  969. 

  970.     return 0;

  971. }

  972. 

  973. static int rm_probe(AVProbeData *p)

  974. {

  975.     /* check file header */

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

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

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

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

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

  981.         return AVPROBE_SCORE_MAX;

  982.     else

  983.         return 0;

  984. }

  985. 

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

  987.                                int64_t *ppos, int64_t pos_limit)

  988. {

  989.     RMDemuxContext *rm = s->priv_data;

  990.     int64_t pos, dts;

  991.     int stream_index2, flags, len, h;

  992. 

  993.     pos = *ppos;

  994. 

  995.     if(rm->old_format)

  996.         return AV_NOPTS_VALUE;

  997. 

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

  999.         return AV_NOPTS_VALUE;

  1000. 

  1001.     rm->remaining_len=0;

  1002.     for(;;){

  1003.         int seq=1;

  1004.         AVStream *st;

  1005. 

  1006.         len=sync(s, &dts, &flags, &stream_index2, &pos);

  1007.         if(len<0)

  1008.             return AV_NOPTS_VALUE;

  1009. 

  1010.         st = s->streams[stream_index2];

  1011.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1012.             h= avio_r8(s->pb); len--;

  1013.             if(!(h & 0x40)){

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

  1015.             }

  1016.         }

  1017. 

  1018.         if((flags&2) && (seq&0x7F) == 1){

  1019.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  1020.                     flags, stream_index2, stream_index, dts, seq);

  1021.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  1022.             if(stream_index2 == stream_index)

  1023.                 break;

  1024.         }

  1025. 

  1026.         avio_skip(s->pb, len);

  1027.     }

  1028.     *ppos = pos;

  1029.     return dts;

  1030. }

  1031. 

  1032. static int rm_read_seek(AVFormatContext *s, int stream_index,

  1033.                         int64_t pts, int flags)

  1034. {

  1035.     RMDemuxContext *rm = s->priv_data;

  1036. 

  1037.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1038.         return -1;

  1039.     rm->audio_pkt_cnt = 0;

  1040.     return 0;

  1041. }

  1042. 

  1043. 

  1044. AVInputFormat ff_rm_demuxer = {

  1045.     .name           = "rm",

  1046.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1047.     .priv_data_size = sizeof(RMDemuxContext),

  1048.     .read_probe     = rm_probe,

  1049.     .read_header    = rm_read_header,

  1050.     .read_packet    = rm_read_packet,

  1051.     .read_close     = rm_read_close,

  1052.     .read_timestamp = rm_read_dts,

  1053.     .read_seek      = rm_read_seek,

  1054. };

  1055. 

  1056. AVInputFormat ff_rdt_demuxer = {

  1057.     .name           = "rdt",

  1058.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1059.     .priv_data_size = sizeof(RMDemuxContext),

  1060.     .read_close     = rm_read_close,

  1061.     .flags          = AVFMT_NOFILE,

  1062. };