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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 <inttypes.h>

  23. 

  24. #include "libavutil/avassert.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavutil/channel_layout.h"

  27. #include "libavutil/internal.h"

  28. #include "libavutil/intreadwrite.h"

  29. #include "libavutil/dict.h"

  30. #include "avformat.h"

  31. #include "avio_internal.h"

  32. #include "internal.h"

  33. #include "rmsipr.h"

  34. #include "rm.h"

  35. 

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

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

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

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

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

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

  42. 

  43. struct RMStream {

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

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

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

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

  48.     int cur_slice, slices;

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

  50.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  57. };

  58. 

  59. typedef struct {

  60.     int nb_packets;

  61.     int old_format;

  62.     int current_stream;

  63.     int remaining_len;

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

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

  66. } RMDemuxContext;

  67. 

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

  69. {

  70.     int i;

  71.     char *q, r;

  72. 

  73.     q = buf;

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

  75.         r = avio_r8(pb);

  76.         if (i < buf_size - 1)

  77.             *q++ = r;

  78.     }

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

  80. }

  81. 

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

  83. {

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

  85. }

  86. 

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

  88. {

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

  90.         return -1;

  91.     if (ff_get_extradata(avctx, pb, size) < 0)

  92.         return AVERROR(ENOMEM);

  93.     return 0;

  94. }

  95. 

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

  97. {

  98.     char buf[1024];

  99.     int i;

  100. 

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

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

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

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

  105.     }

  106. }

  107. 

  108. RMStream *ff_rm_alloc_rmstream (void)

  109. {

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

  111.     rms->curpic_num = -1;

  112.     return rms;

  113. }

  114. 

  115. void ff_rm_free_rmstream (RMStream *rms)

  116. {

  117.     av_free_packet(&rms->pkt);

  118. }

  119. 

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

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

  122. {

  123.     char buf[256];

  124.     uint32_t version;

  125.     int ret;

  126. 

  127.     /* ra type header */

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

  129.     if (version == 3) {

  130.         unsigned bytes_per_minute;

  131.         int header_size = avio_rb16(pb);

  132.         int64_t startpos = avio_tell(pb);

  133.         avio_skip(pb, 8);

  134.         bytes_per_minute = avio_rb16(pb);

  135.         avio_skip(pb, 4);

  136.         rm_read_metadata(s, pb, 0);

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

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

  139.             avio_r8(pb);

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

  141.         }

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

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

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

  145.         if (bytes_per_minute)

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

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

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

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

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

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

  152.         ast->deint_id = DEINT_ID_INT0;

  153.     } else {

  154.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  155.         int codecdata_length;

  156.         unsigned bytes_per_minute;

  157.         /* old version (4) */

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

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

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

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

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

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

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

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

  166.         bytes_per_minute = avio_rb32(pb);

  167.         if (version == 4) {

  168.             if (bytes_per_minute)

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

  170.         }

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

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

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

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

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

  176.         if (version == 5) {

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

  178.         }

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

  180.         avio_rb32(pb);

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

  182.         if (version == 5) {

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

  184.             avio_read(pb, buf, 4);

  185.             buf[4] = 0;

  186.         } else {

  187.             AV_WL32(buf, 0);

  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.         switch (ast->deint_id) {

  261.         case DEINT_ID_INT4:

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

  263.                 sub_packet_h <= 1 ||

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

  265.                 return AVERROR_INVALIDDATA;

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

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

  268.                 return AVERROR_INVALIDDATA;

  269.             }

  270.             break;

  271.         case DEINT_ID_GENR:

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

  273.                 ast->sub_packet_size > ast->audio_framesize)

  274.                 return AVERROR_INVALIDDATA;

  275.             if (ast->audio_framesize % ast->sub_packet_size)

  276.                 return AVERROR_INVALIDDATA;

  277.             break;

  278.         case DEINT_ID_SIPR:

  279.         case DEINT_ID_INT0:

  280.         case DEINT_ID_VBRS:

  281.         case DEINT_ID_VBRF:

  282.             break;

  283.         default:

  284.             av_log(s, AV_LOG_ERROR ,"Unknown interleaver %"PRIX32"\n", ast->deint_id);

  285.             return AVERROR_INVALIDDATA;

  286.         }

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

  288.             ast->deint_id == DEINT_ID_GENR ||

  289.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  293.                 return AVERROR_INVALIDDATA;

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

  295.                 return AVERROR(ENOMEM);

  296.         }

  297. 

  298.         if (read_all) {

  299.             avio_r8(pb);

  300.             avio_r8(pb);

  301.             avio_r8(pb);

  302.             rm_read_metadata(s, pb, 0);

  303.         }

  304.     }

  305.     return 0;

  306. }

  307. 

  308. int

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

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

  311. {

  312.     unsigned int v;

  313.     int size;

  314.     int64_t codec_pos;

  315.     int ret;

  316. 

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

  318.     codec_pos = avio_tell(pb);

  319.     v = avio_rb32(pb);

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

  321.         /* ra type header */

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

  323.             return -1;

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

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

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

  327.             return ret;

  328. 

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

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

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

  332.                                                 st->codec->codec_tag);

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

  334.         int stream_count, rule_count, property_count, i;

  335.         ff_free_stream(s, st);

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

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

  338.             goto skip;

  339.         }

  340.         stream_count = avio_rb16(pb);

  341.         avio_skip(pb, 6*stream_count);

  342.         rule_count = avio_rb16(pb);

  343.         avio_skip(pb, 2*rule_count);

  344.         property_count = avio_rb16(pb);

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

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

  347.             avio_rb32(pb);

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

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

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

  351.             }

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

  353.             switch(avio_rb32(pb)) {

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

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

  356.                 break;

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

  358.             }

  359.         }

  360.     } else {

  361.         int fps;

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

  363.         fail1:

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

  365.             goto skip;

  366.         }

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

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

  369.                                                st->codec->codec_tag);

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

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

  372.             goto fail1;

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

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

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

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

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

  378.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  379.         fps = avio_rb32(pb);

  380. 

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

  382.             return ret;

  383. 

  384.         if (fps > 0) {

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

  386.                       0x10000, fps, (1 << 30) - 1);

  387. #if FF_API_R_FRAME_RATE

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

  389. #endif

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

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

  392.             return AVERROR_INVALIDDATA;

  393.         }

  394.     }

  395. 

  396. skip:

  397.     /* skip codec info */

  398.     size = avio_tell(pb) - codec_pos;

  399.     avio_skip(pb, codec_data_size - size);

  400. 

  401.     return 0;

  402. }

  403. 

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

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

  406. static int rm_read_index(AVFormatContext *s)

  407. {

  408.     AVIOContext *pb = s->pb;

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

  410.     AVStream *st;

  411. 

  412.     do {

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

  414.             return -1;

  415.         size     = avio_rb32(pb);

  416.         if (size < 20)

  417.             return -1;

  418.         avio_skip(pb, 2);

  419.         n_pkts   = avio_rb32(pb);

  420.         str_id   = avio_rb16(pb);

  421.         next_off = avio_rb32(pb);

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

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

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

  425.                 break;

  426.             }

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

  428.             av_log(s, AV_LOG_ERROR,

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

  430.                    str_id, avio_tell(pb));

  431.             goto skip;

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

  433.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  438.             goto skip;

  439.         }

  440. 

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

  442.             avio_skip(pb, 2);

  443.             pts = avio_rb32(pb);

  444.             pos = avio_rb32(pb);

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

  446. 

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

  448.         }

  449. 

  450. skip:

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

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

  453.             av_log(s, AV_LOG_ERROR,

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

  455.             return -1;

  456.         }

  457.     } while (next_off);

  458. 

  459.     return 0;

  460. }

  461. 

  462. static int rm_read_header_old(AVFormatContext *s)

  463. {

  464.     RMDemuxContext *rm = s->priv_data;

  465.     AVStream *st;

  466. 

  467.     rm->old_format = 1;

  468.     st = avformat_new_stream(s, NULL);

  469.     if (!st)

  470.         return -1;

  471.     st->priv_data = ff_rm_alloc_rmstream();

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

  473. }

  474. 

  475. static int rm_read_header(AVFormatContext *s)

  476. {

  477.     RMDemuxContext *rm = s->priv_data;

  478.     AVStream *st;

  479.     AVIOContext *pb = s->pb;

  480.     unsigned int tag;

  481.     int tag_size;

  482.     unsigned int start_time, duration;

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

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

  485.     int flags = 0;

  486. 

  487.     tag = avio_rl32(pb);

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

  489.         /* very old .ra format */

  490.         return rm_read_header_old(s);

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

  492.         return AVERROR(EIO);

  493.     }

  494. 

  495.     tag_size = avio_rb32(pb);

  496.     avio_skip(pb, tag_size - 8);

  497. 

  498.     for(;;) {

  499.         if (url_feof(pb))

  500.             return -1;

  501.         tag = avio_rl32(pb);

  502.         tag_size = avio_rb32(pb);

  503.         avio_rb16(pb);

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

  505.                 (tag      ) & 0xff,

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

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

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

  509.                 tag,

  510.                 tag_size);

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

  512.             return -1;

  513.         switch(tag) {

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

  515.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  528.             break;

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

  530.             rm_read_metadata(s, pb, 1);

  531.             break;

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

  533.             st = avformat_new_stream(s, NULL);

  534.             if (!st)

  535.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  544.             st->start_time = start_time;

  545.             st->duration = duration;

  546.             if(duration>0)

  547.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  551.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  554.                 return -1;

  555.             break;

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

  557.             goto header_end;

  558.         default:

  559.             /* unknown tag: skip it */

  560.             avio_skip(pb, tag_size - 10);

  561.             break;

  562.         }

  563.     }

  564.  header_end:

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

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

  567.         rm->nb_packets = 3600 * 25;

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

  569. 

  570.     if (!data_off)

  571.         data_off = avio_tell(pb) - 18;

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

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

  574.         rm_read_index(s);

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

  576.     }

  577. 

  578.     return 0;

  579. }

  580. 

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

  582. {

  583.     int n, n1;

  584. 

  585.     n = avio_rb16(pb);

  586.     (*len)-=2;

  587.     n &= 0x7FFF;

  588.     if (n >= 0x4000) {

  589.         return n - 0x4000;

  590.     } else {

  591.         n1 = avio_rb16(pb);

  592.         (*len)-=2;

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

  594.     }

  595. }

  596. 

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

  598. #define RAW_PACKET_SIZE 1000

  599. 

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

  601.     RMDemuxContext *rm = s->priv_data;

  602.     AVIOContext *pb = s->pb;

  603.     AVStream *st;

  604.     uint32_t state=0xFFFFFFFF;

  605. 

  606.     while(!url_feof(pb)){

  607.         int len, num, i;

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

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

  610.             num= rm->current_stream;

  611.             len= rm->remaining_len;

  612.             *timestamp = AV_NOPTS_VALUE;

  613.             *flags= 0;

  614.         }else{

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

  616. 

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

  618.                 int n_pkts, expected_len;

  619.                 len = avio_rb32(pb);

  620.                 avio_skip(pb, 2);

  621.                 n_pkts = avio_rb32(pb);

  622.                 expected_len = 20 + n_pkts * 14;

  623.                 if (len == 20)

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

  625.                     len = expected_len;

  626.                 else if (len != expected_len)

  627.                     av_log(s, AV_LOG_WARNING,

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

  629.                            len, n_pkts, expected_len);

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

  631.                 if(len<0)

  632.                     continue;

  633.                 goto skip;

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

  635.                 av_log(s, AV_LOG_WARNING,

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

  637.             }

  638. 

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

  640.                 continue;

  641.             len=state - 12;

  642.             state= 0xFFFFFFFF;

  643. 

  644.             num = avio_rb16(pb);

  645.             *timestamp = avio_rb32(pb);

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

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

  648.         }

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

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

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

  652.                 break;

  653.         }

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

  655. skip:

  656.             /* skip packet if unknown number */

  657.             avio_skip(pb, len);

  658.             rm->remaining_len = 0;

  659.             continue;

  660.         }

  661.         *stream_index= i;

  662. 

  663.         return len;

  664.     }

  665.     return -1;

  666. }

  667. 

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

  669.                                    RMDemuxContext *rm, RMStream *vst,

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

  671.                                    int64_t *timestamp)

  672. {

  673.     int hdr;

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

  675.     int type;

  676.     int ret;

  677. 

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

  679.     type = hdr >> 6;

  680. 

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

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

  683.     }

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

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

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

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

  688.     }

  689.     if(len<0) {

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

  691.         return -1;

  692.     }

  693.     rm->remaining_len = len;

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

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

  696.             len= len2;

  697.             *timestamp = pos;

  698.         }

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

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

  701.             return -1;

  702.         }

  703.         rm->remaining_len -= len;

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

  705.             return AVERROR(EIO);

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

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

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

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

  710.             av_free_packet(pkt);

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

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

  713.         }

  714.         return 0;

  715.     }

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

  717. 

  718.     *pseq = seq;

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

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

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

  722.             return AVERROR_INVALIDDATA;

  723.         }

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

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

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

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

  728.             return AVERROR(ENOMEM);

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

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

  731.         vst->cur_slice = 0;

  732.         vst->curpic_num = pic_num;

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

  734.     }

  735.     if(type == 2)

  736.         len = FFMIN(len, pos);

  737. 

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

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

  740.         return 1;

  741.     }

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

  743.         return AVERROR(ENOMEM);

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

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

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

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

  748.         return 1;

  749.     }

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

  751.         return AVERROR(EIO);

  752.     vst->videobufpos += len;

  753.     rm->remaining_len-= len;

  754. 

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

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

  757.         *pkt= vst->pkt;

  758.         vst->pkt.data= NULL;

  759.         vst->pkt.size= 0;

  760.         vst->pkt.buf = NULL;

  761. #if FF_API_DESTRUCT_PACKET

  762. FF_DISABLE_DEPRECATION_WARNINGS

  763.         vst->pkt.destruct = NULL;

  764. FF_ENABLE_DEPRECATION_WARNINGS

  765. #endif

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

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

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

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

  770.         pkt->pts = AV_NOPTS_VALUE;

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

  772.         vst->slices = 0;

  773.         return 0;

  774.     }

  775. 

  776.     return 1;

  777. }

  778. 

  779. static inline void

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

  781. {

  782.     uint8_t *ptr;

  783.     int j;

  784. 

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

  786.         ptr = pkt->data;

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

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

  789.             ptr += 2;

  790.         }

  791.     }

  792. }

  793. 

  794. static int readfull(AVFormatContext *s, AVIOContext *pb, uint8_t *dst, int n) {

  795.     int ret = avio_read(pb, dst, n);

  796.     if (ret != n) {

  797.         if (ret >= 0) memset(dst + ret, 0, n - ret);

  798.         else          memset(dst      , 0, n);

  799.         av_log(s, AV_LOG_ERROR, "Failed to fully read block\n");

  800.     }

  801.     return ret;

  802. }

  803. 

  804. int

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

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

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

  808. {

  809.     RMDemuxContext *rm = s->priv_data;

  810.     int ret;

  811. 

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

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

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

  815.         if(ret)

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

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

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

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

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

  821.             int x;

  822.             int sps = ast->sub_packet_size;

  823.             int cfs = ast->coded_framesize;

  824.             int h = ast->sub_packet_h;

  825.             int y = ast->sub_packet_cnt;

  826.             int w = ast->audio_framesize;

  827. 

  828.             if (flags & 2)

  829.                 y = ast->sub_packet_cnt = 0;

  830.             if (!y)

  831.                 ast->audiotimestamp = timestamp;

  832. 

  833.             switch (ast->deint_id) {

  834.                 case DEINT_ID_INT4:

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

  836.                         readfull(s, pb, ast->pkt.data+x*2*w+y*cfs, cfs);

  837.                     break;

  838.                 case DEINT_ID_GENR:

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

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

  841.                     break;

  842.                 case DEINT_ID_SIPR:

  843.                     readfull(s, pb, ast->pkt.data + y * w, w);

  844.                     break;

  845.             }

  846. 

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

  848.                 return -1;

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

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

  851. 

  852.              ast->sub_packet_cnt = 0;

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

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

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

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

  857.             int x;

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

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

  860.             if (ast->sub_packet_cnt) {

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

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

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

  864.                 ast->audiotimestamp = timestamp;

  865.             } else

  866.                 return -1;

  867.         } else {

  868.             av_get_packet(pb, pkt, len);

  869.             rm_ac3_swap_bytes(st, pkt);

  870.         }

  871.     } else

  872.         av_get_packet(pb, pkt, len);

  873. 

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

  875. 

  876. #if 0

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

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

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

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

  881. 

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

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

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

  885.         }

  886.     }

  887. #endif

  888. 

  889.     pkt->pts = timestamp;

  890.     if (flags & 2)

  891.         pkt->flags |= AV_PKT_FLAG_KEY;

  892. 

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

  894. }

  895. 

  896. int

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

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

  899. {

  900.     RMDemuxContext *rm = s->priv_data;

  901. 

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

  903. 

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

  905.         ast->deint_id == DEINT_ID_VBRS)

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

  907.     else {

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

  909.             return AVERROR(ENOMEM);

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

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

  912.                st->codec->block_align);

  913.     }

  914.     rm->audio_pkt_cnt--;

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

  916.         ast->audiotimestamp = AV_NOPTS_VALUE;

  917.         pkt->flags = AV_PKT_FLAG_KEY;

  918.     } else

  919.         pkt->flags = 0;

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

  921. 

  922.     return rm->audio_pkt_cnt;

  923. }

  924. 

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

  926. {

  927.     RMDemuxContext *rm = s->priv_data;

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

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

  930.     int64_t timestamp, pos;

  931.     int flags;

  932. 

  933.     for (;;) {

  934.         if (rm->audio_pkt_cnt) {

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

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

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

  938.             if(res < 0)

  939.                 return res;

  940.             flags = 0;

  941.         } else {

  942.             if (rm->old_format) {

  943.                 RMStream *ast;

  944. 

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

  946.                 ast = st->priv_data;

  947.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  952.             } else {

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

  954.                 if (len > 0)

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

  956.             }

  957. 

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

  959.                 return AVERROR(EIO);

  960. 

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

  962.                                       &seq, flags, timestamp);

  963.             if (res < -1)

  964.                 return res;

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

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

  967.             if (res)

  968.                 continue;

  969.         }

  970. 

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

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

  973.             av_free_packet(pkt);

  974.         } else

  975.             break;

  976.     }

  977. 

  978.     return 0;

  979. }

  980. 

  981. static int rm_read_close(AVFormatContext *s)

  982. {

  983.     int i;

  984. 

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

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

  987. 

  988.     return 0;

  989. }

  990. 

  991. static int rm_probe(AVProbeData *p)

  992. {

  993.     /* check file header */

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

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

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

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

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

  999.         return AVPROBE_SCORE_MAX;

  1000.     else

  1001.         return 0;

  1002. }

  1003. 

  1004. static int64_t rm_read_dts(AVFormatContext *s, int stream_index,

  1005.                                int64_t *ppos, int64_t pos_limit)

  1006. {

  1007.     RMDemuxContext *rm = s->priv_data;

  1008.     int64_t pos, dts;

  1009.     int stream_index2, flags, len, h;

  1010. 

  1011.     pos = *ppos;

  1012. 

  1013.     if(rm->old_format)

  1014.         return AV_NOPTS_VALUE;

  1015. 

  1016.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1017.         return AV_NOPTS_VALUE;

  1018. 

  1019.     rm->remaining_len=0;

  1020.     for(;;){

  1021.         int seq=1;

  1022.         AVStream *st;

  1023. 

  1024.         len=sync(s, &dts, &flags, &stream_index2, &pos);

  1025.         if(len<0)

  1026.             return AV_NOPTS_VALUE;

  1027. 

  1028.         st = s->streams[stream_index2];

  1029.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1030.             h= avio_r8(s->pb); len--;

  1031.             if(!(h & 0x40)){

  1032.                 seq = avio_r8(s->pb); len--;

  1033.             }

  1034.         }

  1035. 

  1036.         if((flags&2) && (seq&0x7F) == 1){

  1037.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  1038.                     flags, stream_index2, stream_index, dts, seq);

  1039.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  1040.             if(stream_index2 == stream_index)

  1041.                 break;

  1042.         }

  1043. 

  1044.         avio_skip(s->pb, len);

  1045.     }

  1046.     *ppos = pos;

  1047.     return dts;

  1048. }

  1049. 

  1050. static int rm_read_seek(AVFormatContext *s, int stream_index,

  1051.                         int64_t pts, int flags)

  1052. {

  1053.     RMDemuxContext *rm = s->priv_data;

  1054. 

  1055.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1056.         return -1;

  1057.     rm->audio_pkt_cnt = 0;

  1058.     return 0;

  1059. }

  1060. 

  1061. 

  1062. AVInputFormat ff_rm_demuxer = {

  1063.     .name           = "rm",

  1064.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1065.     .priv_data_size = sizeof(RMDemuxContext),

  1066.     .read_probe     = rm_probe,

  1067.     .read_header    = rm_read_header,

  1068.     .read_packet    = rm_read_packet,

  1069.     .read_close     = rm_read_close,

  1070.     .read_timestamp = rm_read_dts,

  1071.     .read_seek      = rm_read_seek,

  1072. };

  1073. 

  1074. AVInputFormat ff_rdt_demuxer = {

  1075.     .name           = "rdt",

  1076.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1077.     .priv_data_size = sizeof(RMDemuxContext),

  1078.     .read_close     = rm_read_close,

  1079.     .flags          = AVFMT_NOFILE,

  1080. };