falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59307 Commits
32 Branches
817MB
Tree: dd00f9cac3
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'dd00f9cac3'
${ noResults }
FFmpeg/libavformat/rmdec.c

1066 lines
35KB
Raw Blame History 

  1. /*

  2.  * "Real" compatible demuxer.

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include "libavutil/avassert.h"

  23. #include "libavutil/avstring.h"

  24. #include "libavutil/channel_layout.h"

  25. #include "libavutil/internal.h"

  26. #include "libavutil/intreadwrite.h"

  27. #include "libavutil/dict.h"

  28. #include "avformat.h"

  29. #include "avio_internal.h"

  30. #include "internal.h"

  31. #include "rmsipr.h"

  32. #include "rm.h"

  33. 

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

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

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

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

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

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

  40. 

  41. struct RMStream {

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

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

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

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

  46.     int cur_slice, slices;

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

  48.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  55. };

  56. 

  57. typedef struct {

  58.     int nb_packets;

  59.     int old_format;

  60.     int current_stream;

  61.     int remaining_len;

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

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

  64. } RMDemuxContext;

  65. 

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

  67. {

  68.     int i;

  69.     char *q, r;

  70. 

  71.     q = buf;

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

  73.         r = avio_r8(pb);

  74.         if (i < buf_size - 1)

  75.             *q++ = r;

  76.     }

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

  78. }

  79. 

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

  81. {

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

  83. }

  84. 

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

  86. {

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

  88.         return -1;

  89.     if (ff_alloc_extradata(avctx, size))

  90.         return AVERROR(ENOMEM);

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

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

  93.         return AVERROR(EIO);

  94.     return 0;

  95. }

  96. 

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

  98. {

  99.     char buf[1024];

  100.     int i;

  101. 

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

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

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

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

  106.     }

  107. }

  108. 

  109. RMStream *ff_rm_alloc_rmstream (void)

  110. {

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

  112.     rms->curpic_num = -1;

  113.     return rms;

  114. }

  115. 

  116. void ff_rm_free_rmstream (RMStream *rms)

  117. {

  118.     av_free_packet(&rms->pkt);

  119. }

  120. 

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

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

  123. {

  124.     char buf[256];

  125.     uint32_t version;

  126.     int ret;

  127. 

  128.     /* ra type header */

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

  130.     if (version == 3) {

  131.         unsigned bytes_per_minute;

  132.         int header_size = avio_rb16(pb);

  133.         int64_t startpos = avio_tell(pb);

  134.         avio_skip(pb, 8);

  135.         bytes_per_minute = avio_rb16(pb);

  136.         avio_skip(pb, 4);

  137.         rm_read_metadata(s, pb, 0);

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

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

  140.             avio_r8(pb);

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

  142.         }

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

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

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

  146.         if (bytes_per_minute)

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

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

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

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

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

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

  153.         ast->deint_id = DEINT_ID_INT0;

  154.     } else {

  155.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  156.         int codecdata_length;

  157.         unsigned bytes_per_minute;

  158.         /* old version (4) */

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

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

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

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

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

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

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

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

  167.         bytes_per_minute = avio_rb32(pb);

  168.         if (version == 4) {

  169.             if (bytes_per_minute)

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

  171.         }

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

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

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

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

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

  177.         if (version == 5) {

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

  179.         }

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

  181.         avio_rb32(pb);

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

  183.         if (version == 5) {

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

  185.             avio_read(pb, buf, 4);

  186.             buf[4] = 0;

  187.         } else {

  188.             AV_WL32(buf, 0);

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

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

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

  192.         }

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

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

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

  196.                                                 st->codec->codec_tag);

  197. 

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

  199.         case AV_CODEC_ID_AC3:

  200.             st->need_parsing = AVSTREAM_PARSE_FULL;

  201.             break;

  202.         case AV_CODEC_ID_RA_288:

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

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

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

  206.             break;

  207.         case AV_CODEC_ID_COOK:

  208.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  209.         case AV_CODEC_ID_ATRAC3:

  210.         case AV_CODEC_ID_SIPR:

  211.             if (read_all) {

  212.                 codecdata_length = 0;

  213.             } else {

  214.                 avio_rb16(pb); avio_r8(pb);

  215.                 if (version == 5)

  216.                     avio_r8(pb);

  217.                 codecdata_length = avio_rb32(pb);

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

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

  220.                     return -1;

  221.                 }

  222.             }

  223. 

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

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

  226.                 if (flavor > 3) {

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

  228.                            flavor);

  229.                     return -1;

  230.                 }

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

  232.             } else {

  233.                 if(sub_packet_size <= 0){

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

  235.                     return -1;

  236.                 }

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

  238.             }

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

  240.                 return ret;

  241. 

  242.             break;

  243.         case AV_CODEC_ID_AAC:

  244.             avio_rb16(pb); avio_r8(pb);

  245.             if (version == 5)

  246.                 avio_r8(pb);

  247.             codecdata_length = avio_rb32(pb);

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

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

  250.                 return -1;

  251.             }

  252.             if (codecdata_length >= 1) {

  253.                 avio_r8(pb);

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

  255.                     return ret;

  256.             }

  257.             break;

  258.         default:

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

  260.         }

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

  262.             ast->deint_id == DEINT_ID_GENR ||

  263.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  267.                 return AVERROR_INVALIDDATA;

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

  269.                 return AVERROR(ENOMEM);

  270.         }

  271.         switch (ast->deint_id) {

  272.         case DEINT_ID_INT4:

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

  274.                 sub_packet_h <= 1 ||

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

  276.                 return AVERROR_INVALIDDATA;

  277.             break;

  278.         case DEINT_ID_GENR:

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

  280.                 ast->sub_packet_size > ast->audio_framesize)

  281.                 return AVERROR_INVALIDDATA;

  282.             break;

  283.         case DEINT_ID_SIPR:

  284.         case DEINT_ID_INT0:

  285.         case DEINT_ID_VBRS:

  286.         case DEINT_ID_VBRF:

  287.             break;

  288.         default:

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

  290.             return AVERROR_INVALIDDATA;

  291.         }

  292. 

  293.         if (read_all) {

  294.             avio_r8(pb);

  295.             avio_r8(pb);

  296.             avio_r8(pb);

  297.             rm_read_metadata(s, pb, 0);

  298.         }

  299.     }

  300.     return 0;

  301. }

  302. 

  303. int

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

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

  306. {

  307.     unsigned int v;

  308.     int size;

  309.     int64_t codec_pos;

  310.     int ret;

  311. 

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

  313.     codec_pos = avio_tell(pb);

  314.     v = avio_rb32(pb);

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

  316.         /* ra type header */

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

  318.             return -1;

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

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

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

  322.             return ret;

  323. 

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

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

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

  327.                                                 st->codec->codec_tag);

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

  329.         int stream_count, rule_count, property_count, i;

  330.         ff_free_stream(s, st);

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

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

  333.             goto skip;

  334.         }

  335.         stream_count = avio_rb16(pb);

  336.         avio_skip(pb, 6*stream_count);

  337.         rule_count = avio_rb16(pb);

  338.         avio_skip(pb, 2*rule_count);

  339.         property_count = avio_rb16(pb);

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

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

  342.             avio_rb32(pb);

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

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

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

  346.             }

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

  348.             switch(avio_rb32(pb)) {

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

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

  351.                 break;

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

  353.             }

  354.         }

  355.     } else {

  356.         int fps;

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

  358.         fail1:

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

  360.             goto skip;

  361.         }

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

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

  364.                                                st->codec->codec_tag);

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

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

  367.             goto fail1;

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

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

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

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

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

  373.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  374.         fps = avio_rb32(pb);

  375. 

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

  377.             return ret;

  378. 

  379.         if (fps > 0) {

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

  381.                       0x10000, fps, (1 << 30) - 1);

  382. #if FF_API_R_FRAME_RATE

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

  384. #endif

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

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

  387.             return AVERROR_INVALIDDATA;

  388.         }

  389.     }

  390. 

  391. skip:

  392.     /* skip codec info */

  393.     size = avio_tell(pb) - codec_pos;

  394.     avio_skip(pb, codec_data_size - size);

  395. 

  396.     return 0;

  397. }

  398. 

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

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

  401. static int rm_read_index(AVFormatContext *s)

  402. {

  403.     AVIOContext *pb = s->pb;

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

  405.     AVStream *st;

  406. 

  407.     do {

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

  409.             return -1;

  410.         size     = avio_rb32(pb);

  411.         if (size < 20)

  412.             return -1;

  413.         avio_skip(pb, 2);

  414.         n_pkts   = avio_rb32(pb);

  415.         str_id   = avio_rb16(pb);

  416.         next_off = avio_rb32(pb);

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

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

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

  420.                 break;

  421.             }

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

  423.             av_log(s, AV_LOG_ERROR,

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

  425.                    str_id, avio_tell(pb));

  426.             goto skip;

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

  428.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  433.             goto skip;

  434.         }

  435. 

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

  437.             avio_skip(pb, 2);

  438.             pts = avio_rb32(pb);

  439.             pos = avio_rb32(pb);

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

  441. 

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

  443.         }

  444. 

  445. skip:

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

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

  448.             av_log(s, AV_LOG_ERROR,

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

  450.             return -1;

  451.         }

  452.     } while (next_off);

  453. 

  454.     return 0;

  455. }

  456. 

  457. static int rm_read_header_old(AVFormatContext *s)

  458. {

  459.     RMDemuxContext *rm = s->priv_data;

  460.     AVStream *st;

  461. 

  462.     rm->old_format = 1;

  463.     st = avformat_new_stream(s, NULL);

  464.     if (!st)

  465.         return -1;

  466.     st->priv_data = ff_rm_alloc_rmstream();

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

  468. }

  469. 

  470. static int rm_read_header(AVFormatContext *s)

  471. {

  472.     RMDemuxContext *rm = s->priv_data;

  473.     AVStream *st;

  474.     AVIOContext *pb = s->pb;

  475.     unsigned int tag;

  476.     int tag_size;

  477.     unsigned int start_time, duration;

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

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

  480.     int flags = 0;

  481. 

  482.     tag = avio_rl32(pb);

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

  484.         /* very old .ra format */

  485.         return rm_read_header_old(s);

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

  487.         return AVERROR(EIO);

  488.     }

  489. 

  490.     tag_size = avio_rb32(pb);

  491.     avio_skip(pb, tag_size - 8);

  492. 

  493.     for(;;) {

  494.         if (url_feof(pb))

  495.             return -1;

  496.         tag = avio_rl32(pb);

  497.         tag_size = avio_rb32(pb);

  498.         avio_rb16(pb);

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

  500.                 (tag      ) & 0xff,

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

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

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

  504.                 tag,

  505.                 tag_size);

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

  507.             return -1;

  508.         switch(tag) {

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

  510.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  523.             break;

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

  525.             rm_read_metadata(s, pb, 1);

  526.             break;

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

  528.             st = avformat_new_stream(s, NULL);

  529.             if (!st)

  530.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  539.             st->start_time = start_time;

  540.             st->duration = duration;

  541.             if(duration>0)

  542.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  546.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  549.                 return -1;

  550.             break;

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

  552.             goto header_end;

  553.         default:

  554.             /* unknown tag: skip it */

  555.             avio_skip(pb, tag_size - 10);

  556.             break;

  557.         }

  558.     }

  559.  header_end:

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

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

  562.         rm->nb_packets = 3600 * 25;

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

  564. 

  565.     if (!data_off)

  566.         data_off = avio_tell(pb) - 18;

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

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

  569.         rm_read_index(s);

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

  571.     }

  572. 

  573.     return 0;

  574. }

  575. 

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

  577. {

  578.     int n, n1;

  579. 

  580.     n = avio_rb16(pb);

  581.     (*len)-=2;

  582.     n &= 0x7FFF;

  583.     if (n >= 0x4000) {

  584.         return n - 0x4000;

  585.     } else {

  586.         n1 = avio_rb16(pb);

  587.         (*len)-=2;

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

  589.     }

  590. }

  591. 

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

  593. #define RAW_PACKET_SIZE 1000

  594. 

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

  596.     RMDemuxContext *rm = s->priv_data;

  597.     AVIOContext *pb = s->pb;

  598.     AVStream *st;

  599.     uint32_t state=0xFFFFFFFF;

  600. 

  601.     while(!url_feof(pb)){

  602.         int len, num, i;

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

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

  605.             num= rm->current_stream;

  606.             len= rm->remaining_len;

  607.             *timestamp = AV_NOPTS_VALUE;

  608.             *flags= 0;

  609.         }else{

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

  611. 

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

  613.                 int n_pkts, expected_len;

  614.                 len = avio_rb32(pb);

  615.                 avio_skip(pb, 2);

  616.                 n_pkts = avio_rb32(pb);

  617.                 expected_len = 20 + n_pkts * 14;

  618.                 if (len == 20)

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

  620.                     len = expected_len;

  621.                 else if (len != expected_len)

  622.                     av_log(s, AV_LOG_WARNING,

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

  624.                            len, n_pkts, expected_len);

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

  626.                 if(len<0)

  627.                     continue;

  628.                 goto skip;

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

  630.                 av_log(s, AV_LOG_WARNING,

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

  632.             }

  633. 

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

  635.                 continue;

  636.             len=state - 12;

  637.             state= 0xFFFFFFFF;

  638. 

  639.             num = avio_rb16(pb);

  640.             *timestamp = avio_rb32(pb);

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

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

  643.         }

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

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

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

  647.                 break;

  648.         }

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

  650. skip:

  651.             /* skip packet if unknown number */

  652.             avio_skip(pb, len);

  653.             rm->remaining_len = 0;

  654.             continue;

  655.         }

  656.         *stream_index= i;

  657. 

  658.         return len;

  659.     }

  660.     return -1;

  661. }

  662. 

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

  664.                                    RMDemuxContext *rm, RMStream *vst,

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

  666.                                    int64_t *timestamp)

  667. {

  668.     int hdr;

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

  670.     int type;

  671.     int ret;

  672. 

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

  674.     type = hdr >> 6;

  675. 

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

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

  678.     }

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

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

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

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

  683.     }

  684.     if(len<0) {

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

  686.         return -1;

  687.     }

  688.     rm->remaining_len = len;

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

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

  691.             len= len2;

  692.             *timestamp = pos;

  693.         }

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

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

  696.             return -1;

  697.         }

  698.         rm->remaining_len -= len;

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

  700.             return AVERROR(EIO);

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

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

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

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

  705.             av_free_packet(pkt);

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

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

  708.         }

  709.         return 0;

  710.     }

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

  712. 

  713.     *pseq = seq;

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

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

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

  717.             return AVERROR_INVALIDDATA;

  718.         }

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

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

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

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

  723.             return AVERROR(ENOMEM);

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

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

  726.         vst->cur_slice = 0;

  727.         vst->curpic_num = pic_num;

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

  729.     }

  730.     if(type == 2)

  731.         len = FFMIN(len, pos);

  732. 

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

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

  735.         return 1;

  736.     }

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

  738.         return AVERROR(ENOMEM);

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

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

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

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

  743.         return 1;

  744.     }

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

  746.         return AVERROR(EIO);

  747.     vst->videobufpos += len;

  748.     rm->remaining_len-= len;

  749. 

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

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

  752.         *pkt= vst->pkt;

  753.         vst->pkt.data= NULL;

  754.         vst->pkt.size= 0;

  755.         vst->pkt.buf = NULL;

  756. #if FF_API_DESTRUCT_PACKET

  757. FF_DISABLE_DEPRECATION_WARNINGS

  758.         vst->pkt.destruct = NULL;

  759. FF_ENABLE_DEPRECATION_WARNINGS

  760. #endif

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

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

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

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

  765.         pkt->pts = AV_NOPTS_VALUE;

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

  767.         vst->slices = 0;

  768.         return 0;

  769.     }

  770. 

  771.     return 1;

  772. }

  773. 

  774. static inline void

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

  776. {

  777.     uint8_t *ptr;

  778.     int j;

  779. 

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

  781.         ptr = pkt->data;

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

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

  784.             ptr += 2;

  785.         }

  786.     }

  787. }

  788. 

  789. int

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

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

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

  793. {

  794.     RMDemuxContext *rm = s->priv_data;

  795.     int ret;

  796. 

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

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

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

  800.         if(ret)

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

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

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

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

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

  806.             int x;

  807.             int sps = ast->sub_packet_size;

  808.             int cfs = ast->coded_framesize;

  809.             int h = ast->sub_packet_h;

  810.             int y = ast->sub_packet_cnt;

  811.             int w = ast->audio_framesize;

  812. 

  813.             if (flags & 2)

  814.                 y = ast->sub_packet_cnt = 0;

  815.             if (!y)

  816.                 ast->audiotimestamp = timestamp;

  817. 

  818.             switch (ast->deint_id) {

  819.                 case DEINT_ID_INT4:

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

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

  822.                     break;

  823.                 case DEINT_ID_GENR:

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

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

  826.                     break;

  827.                 case DEINT_ID_SIPR:

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

  829.                     break;

  830.             }

  831. 

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

  833.                 return -1;

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

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

  836. 

  837.              ast->sub_packet_cnt = 0;

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

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

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

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

  842.             int x;

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

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

  845.             if (ast->sub_packet_cnt) {

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

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

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

  849.                 ast->audiotimestamp = timestamp;

  850.             } else

  851.                 return -1;

  852.         } else {

  853.             av_get_packet(pb, pkt, len);

  854.             rm_ac3_swap_bytes(st, pkt);

  855.         }

  856.     } else

  857.         av_get_packet(pb, pkt, len);

  858. 

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

  860. 

  861. #if 0

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

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

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

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

  866. 

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

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

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

  870.         }

  871.     }

  872. #endif

  873. 

  874.     pkt->pts = timestamp;

  875.     if (flags & 2)

  876.         pkt->flags |= AV_PKT_FLAG_KEY;

  877. 

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

  879. }

  880. 

  881. int

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

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

  884. {

  885.     RMDemuxContext *rm = s->priv_data;

  886. 

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

  888. 

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

  890.         ast->deint_id == DEINT_ID_VBRS)

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

  892.     else {

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

  894.             return AVERROR(ENOMEM);

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

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

  897.                st->codec->block_align);

  898.     }

  899.     rm->audio_pkt_cnt--;

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

  901.         ast->audiotimestamp = AV_NOPTS_VALUE;

  902.         pkt->flags = AV_PKT_FLAG_KEY;

  903.     } else

  904.         pkt->flags = 0;

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

  906. 

  907.     return rm->audio_pkt_cnt;

  908. }

  909. 

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

  911. {

  912.     RMDemuxContext *rm = s->priv_data;

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

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

  915.     int64_t timestamp, pos;

  916.     int flags;

  917. 

  918.     for (;;) {

  919.         if (rm->audio_pkt_cnt) {

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

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

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

  923.             if(res < 0)

  924.                 return res;

  925.             flags = 0;

  926.         } else {

  927.             if (rm->old_format) {

  928.                 RMStream *ast;

  929. 

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

  931.                 ast = st->priv_data;

  932.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  937.             } else {

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

  939.                 if (len > 0)

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

  941.             }

  942. 

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

  944.                 return AVERROR(EIO);

  945. 

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

  947.                                       &seq, flags, timestamp);

  948.             if (res < -1)

  949.                 return res;

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

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

  952.             if (res)

  953.                 continue;

  954.         }

  955. 

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

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

  958.             av_free_packet(pkt);

  959.         } else

  960.             break;

  961.     }

  962. 

  963.     return 0;

  964. }

  965. 

  966. static int rm_read_close(AVFormatContext *s)

  967. {

  968.     int i;

  969. 

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

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

  972. 

  973.     return 0;

  974. }

  975. 

  976. static int rm_probe(AVProbeData *p)

  977. {

  978.     /* check file header */

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

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

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

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

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

  984.         return AVPROBE_SCORE_MAX;

  985.     else

  986.         return 0;

  987. }

  988. 

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

  990.                                int64_t *ppos, int64_t pos_limit)

  991. {

  992.     RMDemuxContext *rm = s->priv_data;

  993.     int64_t pos, dts;

  994.     int stream_index2, flags, len, h;

  995. 

  996.     pos = *ppos;

  997. 

  998.     if(rm->old_format)

  999.         return AV_NOPTS_VALUE;

  1000. 

  1001.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1002.         return AV_NOPTS_VALUE;

  1003. 

  1004.     rm->remaining_len=0;

  1005.     for(;;){

  1006.         int seq=1;

  1007.         AVStream *st;

  1008. 

  1009.         len=sync(s, &dts, &flags, &stream_index2, &pos);

  1010.         if(len<0)

  1011.             return AV_NOPTS_VALUE;

  1012. 

  1013.         st = s->streams[stream_index2];

  1014.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1015.             h= avio_r8(s->pb); len--;

  1016.             if(!(h & 0x40)){

  1017.                 seq = avio_r8(s->pb); len--;

  1018.             }

  1019.         }

  1020. 

  1021.         if((flags&2) && (seq&0x7F) == 1){

  1022.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  1023.                     flags, stream_index2, stream_index, dts, seq);

  1024.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  1025.             if(stream_index2 == stream_index)

  1026.                 break;

  1027.         }

  1028. 

  1029.         avio_skip(s->pb, len);

  1030.     }

  1031.     *ppos = pos;

  1032.     return dts;

  1033. }

  1034. 

  1035. static int rm_read_seek(AVFormatContext *s, int stream_index,

  1036.                         int64_t pts, int flags)

  1037. {

  1038.     RMDemuxContext *rm = s->priv_data;

  1039. 

  1040.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1041.         return -1;

  1042.     rm->audio_pkt_cnt = 0;

  1043.     return 0;

  1044. }

  1045. 

  1046. 

  1047. AVInputFormat ff_rm_demuxer = {

  1048.     .name           = "rm",

  1049.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  1050.     .priv_data_size = sizeof(RMDemuxContext),

  1051.     .read_probe     = rm_probe,

  1052.     .read_header    = rm_read_header,

  1053.     .read_packet    = rm_read_packet,

  1054.     .read_close     = rm_read_close,

  1055.     .read_timestamp = rm_read_dts,

  1056.     .read_seek      = rm_read_seek,

  1057. };

  1058. 

  1059. AVInputFormat ff_rdt_demuxer = {

  1060.     .name           = "rdt",

  1061.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1062.     .priv_data_size = sizeof(RMDemuxContext),

  1063.     .read_close     = rm_read_close,

  1064.     .flags          = AVFMT_NOFILE,

  1065. };