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FFmpeg/libavformat/rmdec.c

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  1. /*

  2.  * "Real" compatible demuxer.

  3.  * Copyright (c) 2000, 2001 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "libavutil/avassert.h"

  23. #include "libavutil/avstring.h"

  24. #include "libavutil/channel_layout.h"

  25. #include "libavutil/intreadwrite.h"

  26. #include "libavutil/dict.h"

  27. #include "avformat.h"

  28. #include "avio_internal.h"

  29. #include "internal.h"

  30. #include "rmsipr.h"

  31. #include "rm.h"

  32. 

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

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

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

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

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

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

  39. 

  40. struct RMStream {

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

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

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

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

  45.     int cur_slice, slices;

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

  47.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  54. };

  55. 

  56. typedef struct {

  57.     int nb_packets;

  58.     int old_format;

  59.     int current_stream;

  60.     int remaining_len;

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

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

  63. } RMDemuxContext;

  64. 

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

  66. {

  67.     int i;

  68.     char *q, r;

  69. 

  70.     q = buf;

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

  72.         r = avio_r8(pb);

  73.         if (i < buf_size - 1)

  74.             *q++ = r;

  75.     }

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

  77. }

  78. 

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

  80. {

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

  82. }

  83. 

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

  85. {

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

  87.         return -1;

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

  89.     if (!avctx->extradata)

  90.         return AVERROR(ENOMEM);

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

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

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

  94.         return AVERROR(EIO);

  95.     return 0;

  96. }

  97. 

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

  99. {

  100.     char buf[1024];

  101.     int i;

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

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

  104.         get_strl(s->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, 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, 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.         av_reduce(&st->avg_frame_rate.den, &st->avg_frame_rate.num,

  379.                   0x10000, fps, (1 << 30) - 1);

  380. #if FF_API_R_FRAME_RATE

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

  382. #endif

  383.     }

  384. 

  385. skip:

  386.     /* skip codec info */

  387.     size = avio_tell(pb) - codec_pos;

  388.     avio_skip(pb, codec_data_size - size);

  389. 

  390.     return 0;

  391. }

  392. 

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

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

  395. static int rm_read_index(AVFormatContext *s)

  396. {

  397.     AVIOContext *pb = s->pb;

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

  399.     AVStream *st;

  400. 

  401.     do {

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

  403.             return -1;

  404.         size     = avio_rb32(pb);

  405.         if (size < 20)

  406.             return -1;

  407.         avio_skip(pb, 2);

  408.         n_pkts   = avio_rb32(pb);

  409.         str_id   = avio_rb16(pb);

  410.         next_off = avio_rb32(pb);

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

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

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

  414.                 break;

  415.             }

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

  417.             av_log(s, AV_LOG_ERROR,

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

  419.                    str_id, avio_tell(pb));

  420.             goto skip;

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

  422.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  427.             goto skip;

  428.         }

  429. 

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

  431.             avio_skip(pb, 2);

  432.             pts = avio_rb32(pb);

  433.             pos = avio_rb32(pb);

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

  435. 

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

  437.         }

  438. 

  439. skip:

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

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

  442.             av_log(s, AV_LOG_ERROR,

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

  444.             return -1;

  445.         }

  446.     } while (next_off);

  447. 

  448.     return 0;

  449. }

  450. 

  451. static int rm_read_header_old(AVFormatContext *s)

  452. {

  453.     RMDemuxContext *rm = s->priv_data;

  454.     AVStream *st;

  455. 

  456.     rm->old_format = 1;

  457.     st = avformat_new_stream(s, NULL);

  458.     if (!st)

  459.         return -1;

  460.     st->priv_data = ff_rm_alloc_rmstream();

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

  462. }

  463. 

  464. static int rm_read_header(AVFormatContext *s)

  465. {

  466.     RMDemuxContext *rm = s->priv_data;

  467.     AVStream *st;

  468.     AVIOContext *pb = s->pb;

  469.     unsigned int tag;

  470.     int tag_size;

  471.     unsigned int start_time, duration;

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

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

  474.     int flags = 0;

  475. 

  476.     tag = avio_rl32(pb);

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

  478.         /* very old .ra format */

  479.         return rm_read_header_old(s);

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

  481.         return AVERROR(EIO);

  482.     }

  483. 

  484.     tag_size = avio_rb32(pb);

  485.     avio_skip(pb, tag_size - 8);

  486. 

  487.     for(;;) {

  488.         if (url_feof(pb))

  489.             return -1;

  490.         tag = avio_rl32(pb);

  491.         tag_size = avio_rb32(pb);

  492.         avio_rb16(pb);

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

  494.                 (tag      ) & 0xff,

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

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

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

  498.                 tag,

  499.                 tag_size);

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

  501.             return -1;

  502.         switch(tag) {

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

  504.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  517.             break;

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

  519.             rm_read_metadata(s, 1);

  520.             break;

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

  522.             st = avformat_new_stream(s, NULL);

  523.             if (!st)

  524.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  533.             st->start_time = start_time;

  534.             st->duration = duration;

  535.             if(duration>0)

  536.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  540.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  543.                 return -1;

  544.             break;

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

  546.             goto header_end;

  547.         default:

  548.             /* unknown tag: skip it */

  549.             avio_skip(pb, tag_size - 10);

  550.             break;

  551.         }

  552.     }

  553.  header_end:

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

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

  556.         rm->nb_packets = 3600 * 25;

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

  558. 

  559.     if (!data_off)

  560.         data_off = avio_tell(pb) - 18;

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

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

  563.         rm_read_index(s);

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

  565.     }

  566. 

  567.     return 0;

  568. }

  569. 

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

  571. {

  572.     int n, n1;

  573. 

  574.     n = avio_rb16(pb);

  575.     (*len)-=2;

  576.     n &= 0x7FFF;

  577.     if (n >= 0x4000) {

  578.         return n - 0x4000;

  579.     } else {

  580.         n1 = avio_rb16(pb);

  581.         (*len)-=2;

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

  583.     }

  584. }

  585. 

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

  587. #define RAW_PACKET_SIZE 1000

  588. 

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

  590.     RMDemuxContext *rm = s->priv_data;

  591.     AVIOContext *pb = s->pb;

  592.     AVStream *st;

  593.     uint32_t state=0xFFFFFFFF;

  594. 

  595.     while(!url_feof(pb)){

  596.         int len, num, i;

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

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

  599.             num= rm->current_stream;

  600.             len= rm->remaining_len;

  601.             *timestamp = AV_NOPTS_VALUE;

  602.             *flags= 0;

  603.         }else{

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

  605. 

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

  607.                 int n_pkts, expected_len;

  608.                 len = avio_rb32(pb);

  609.                 avio_skip(pb, 2);

  610.                 n_pkts = avio_rb32(pb);

  611.                 expected_len = 20 + n_pkts * 14;

  612.                 if (len == 20)

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

  614.                     len = expected_len;

  615.                 else if (len != expected_len)

  616.                     av_log(s, AV_LOG_WARNING,

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

  618.                            len, n_pkts, expected_len);

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

  620.                 if(len<0)

  621.                     continue;

  622.                 goto skip;

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

  624.                 av_log(s, AV_LOG_WARNING,

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

  626.             }

  627. 

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

  629.                 continue;

  630.             len=state - 12;

  631.             state= 0xFFFFFFFF;

  632. 

  633.             num = avio_rb16(pb);

  634.             *timestamp = avio_rb32(pb);

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

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

  637.         }

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

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

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

  641.                 break;

  642.         }

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

  644. skip:

  645.             /* skip packet if unknown number */

  646.             avio_skip(pb, len);

  647.             rm->remaining_len = 0;

  648.             continue;

  649.         }

  650.         *stream_index= i;

  651. 

  652.         return len;

  653.     }

  654.     return -1;

  655. }

  656. 

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

  658.                                    RMDemuxContext *rm, RMStream *vst,

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

  660.                                    int64_t *timestamp)

  661. {

  662.     int hdr;

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

  664.     int type;

  665. 

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

  667.     type = hdr >> 6;

  668. 

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

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

  671.     }

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

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

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

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

  676.     }

  677.     if(len<0)

  678.         return -1;

  679.     rm->remaining_len = len;

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

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

  682.             len= len2;

  683.             *timestamp = pos;

  684.         }

  685.         if(rm->remaining_len < len)

  686.             return -1;

  687.         rm->remaining_len -= len;

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

  689.             return AVERROR(EIO);

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

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

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

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

  694.         return 0;

  695.     }

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

  697. 

  698.     *pseq = seq;

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

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

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

  702.             return AVERROR_INVALIDDATA;

  703.         }

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

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

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

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

  708.             return AVERROR(ENOMEM);

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

  710.         vst->cur_slice = 0;

  711.         vst->curpic_num = pic_num;

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

  713.     }

  714.     if(type == 2)

  715.         len = FFMIN(len, pos);

  716. 

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

  718.         return 1;

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

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

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

  722.         return 1;

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

  724.         return AVERROR(EIO);

  725.     vst->videobufpos += len;

  726.     rm->remaining_len-= len;

  727. 

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

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

  730.         *pkt= vst->pkt;

  731.         vst->pkt.data= NULL;

  732.         vst->pkt.size= 0;

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

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

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

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

  737.         pkt->pts = AV_NOPTS_VALUE;

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

  739.         vst->slices = 0;

  740.         return 0;

  741.     }

  742. 

  743.     return 1;

  744. }

  745. 

  746. static inline void

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

  748. {

  749.     uint8_t *ptr;

  750.     int j;

  751. 

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

  753.         ptr = pkt->data;

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

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

  756.             ptr += 2;

  757.         }

  758.     }

  759. }

  760. 

  761. int

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

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

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

  765. {

  766.     RMDemuxContext *rm = s->priv_data;

  767. 

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

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

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

  771.             return -1; //got partial frame

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

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

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

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

  776.             int x;

  777.             int sps = ast->sub_packet_size;

  778.             int cfs = ast->coded_framesize;

  779.             int h = ast->sub_packet_h;

  780.             int y = ast->sub_packet_cnt;

  781.             int w = ast->audio_framesize;

  782. 

  783.             if (flags & 2)

  784.                 y = ast->sub_packet_cnt = 0;

  785.             if (!y)

  786.                 ast->audiotimestamp = timestamp;

  787. 

  788.             switch (ast->deint_id) {

  789.                 case DEINT_ID_INT4:

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

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

  792.                     break;

  793.                 case DEINT_ID_GENR:

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

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

  796.                     break;

  797.                 case DEINT_ID_SIPR:

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

  799.                     break;

  800.             }

  801. 

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

  803.                 return -1;

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

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

  806. 

  807.              ast->sub_packet_cnt = 0;

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

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

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

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

  812.             int x;

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

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

  815.             if (ast->sub_packet_cnt) {

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

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

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

  819.                 ast->audiotimestamp = timestamp;

  820.             } else

  821.                 return -1;

  822.         } else {

  823.             av_get_packet(pb, pkt, len);

  824.             rm_ac3_swap_bytes(st, pkt);

  825.         }

  826.     } else

  827.         av_get_packet(pb, pkt, len);

  828. 

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

  830. 

  831. #if 0

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

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

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

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

  836. 

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

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

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

  840.         }

  841.     }

  842. #endif

  843. 

  844.     pkt->pts = timestamp;

  845.     if (flags & 2)

  846.         pkt->flags |= AV_PKT_FLAG_KEY;

  847. 

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

  849. }

  850. 

  851. int

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

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

  854. {

  855.     RMDemuxContext *rm = s->priv_data;

  856. 

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

  858. 

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

  860.         ast->deint_id == DEINT_ID_VBRS)

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

  862.     else {

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

  864.             return AVERROR(ENOMEM);

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

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

  867.                st->codec->block_align);

  868.     }

  869.     rm->audio_pkt_cnt--;

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

  871.         ast->audiotimestamp = AV_NOPTS_VALUE;

  872.         pkt->flags = AV_PKT_FLAG_KEY;

  873.     } else

  874.         pkt->flags = 0;

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

  876. 

  877.     return rm->audio_pkt_cnt;

  878. }

  879. 

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

  881. {

  882.     RMDemuxContext *rm = s->priv_data;

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

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

  885.     int64_t timestamp, pos;

  886.     int flags;

  887. 

  888.     for (;;) {

  889.         if (rm->audio_pkt_cnt) {

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

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

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

  893.             if(res < 0)

  894.                 return res;

  895.             flags = 0;

  896.         } else {

  897.             if (rm->old_format) {

  898.                 RMStream *ast;

  899. 

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

  901.                 ast = st->priv_data;

  902.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  907.             } else {

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

  909.                 if (len > 0)

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

  911.             }

  912. 

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

  914.                 return AVERROR(EIO);

  915. 

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

  917.                                       &seq, flags, timestamp);

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

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

  920.             if (res)

  921.                 continue;

  922.         }

  923. 

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

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

  926.             av_free_packet(pkt);

  927.         } else

  928.             break;

  929.     }

  930. 

  931.     return 0;

  932. }

  933. 

  934. static int rm_read_close(AVFormatContext *s)

  935. {

  936.     int i;

  937. 

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

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

  940. 

  941.     return 0;

  942. }

  943. 

  944. static int rm_probe(AVProbeData *p)

  945. {

  946.     /* check file header */

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

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

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

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

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

  952.         return AVPROBE_SCORE_MAX;

  953.     else

  954.         return 0;

  955. }

  956. 

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

  958.                                int64_t *ppos, int64_t pos_limit)

  959. {

  960.     RMDemuxContext *rm = s->priv_data;

  961.     int64_t pos, dts;

  962.     int stream_index2, flags, len, h;

  963. 

  964.     pos = *ppos;

  965. 

  966.     if(rm->old_format)

  967.         return AV_NOPTS_VALUE;

  968. 

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

  970.         return AV_NOPTS_VALUE;

  971. 

  972.     rm->remaining_len=0;

  973.     for(;;){

  974.         int seq=1;

  975.         AVStream *st;

  976. 

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

  978.         if(len<0)

  979.             return AV_NOPTS_VALUE;

  980. 

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

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

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

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

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

  986.             }

  987.         }

  988. 

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

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

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

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

  993.             if(stream_index2 == stream_index)

  994.                 break;

  995.         }

  996. 

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

  998.     }

  999.     *ppos = pos;

  1000.     return dts;

  1001. }

  1002. 

  1003. AVInputFormat ff_rm_demuxer = {

  1004.     .name           = "rm",

  1005.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1006.     .priv_data_size = sizeof(RMDemuxContext),

  1007.     .read_probe     = rm_probe,

  1008.     .read_header    = rm_read_header,

  1009.     .read_packet    = rm_read_packet,

  1010.     .read_close     = rm_read_close,

  1011.     .read_timestamp = rm_read_dts,

  1012. };

  1013. 

  1014. AVInputFormat ff_rdt_demuxer = {

  1015.     .name           = "rdt",

  1016.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1017.     .priv_data_size = sizeof(RMDemuxContext),

  1018.     .read_close     = rm_read_close,

  1019.     .flags          = AVFMT_NOFILE,

  1020. };