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.
45732 Commits
32 Branches
759MB
Tree: d30351363f
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'd30351363f'
${ noResults }
FFmpeg/libavformat/rmdec.c

996 lines
33KB
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/avstring.h"

  23. #include "libavutil/intreadwrite.h"

  24. #include "libavutil/dict.h"

  25. #include "avformat.h"

  26. #include "internal.h"

  27. #include "riff.h"

  28. #include "rmsipr.h"

  29. #include "rm.h"

  30. 

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

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

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

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

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

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

  37. 

  38. struct RMStream {

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

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

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

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

  43.     int cur_slice, slices;

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

  45.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  52. };

  53. 

  54. typedef struct {

  55.     int nb_packets;

  56.     int old_format;

  57.     int current_stream;

  58.     int remaining_len;

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

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

  61. } RMDemuxContext;

  62. 

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

  64. {

  65.     int i;

  66.     char *q, r;

  67. 

  68.     q = buf;

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

  70.         r = avio_r8(pb);

  71.         if (i < buf_size - 1)

  72.             *q++ = r;

  73.     }

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

  75. }

  76. 

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

  78. {

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

  80. }

  81. 

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

  83. {

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

  85.         return -1;

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

  87.     if (!avctx->extradata)

  88.         return AVERROR(ENOMEM);

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

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

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

  92.         return AVERROR(EIO);

  93.     return 0;

  94. }

  95. 

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

  97. {

  98.     char buf[1024];

  99.     int i;

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

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

  102.         get_strl(s->pb, buf, sizeof(buf), len);

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

  104.     }

  105. }

  106. 

  107. RMStream *ff_rm_alloc_rmstream (void)

  108. {

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

  110.     rms->curpic_num = -1;

  111.     return rms;

  112. }

  113. 

  114. void ff_rm_free_rmstream (RMStream *rms)

  115. {

  116.     av_free_packet(&rms->pkt);

  117. }

  118. 

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

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

  121. {

  122.     char buf[256];

  123.     uint32_t version;

  124.     int ret;

  125. 

  126.     /* ra type header */

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

  128.     if (version == 3) {

  129.         int header_size = avio_rb16(pb);

  130.         int64_t startpos = avio_tell(pb);

  131.         avio_skip(pb, 14);

  132.         rm_read_metadata(s, 0);

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

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

  135.             avio_r8(pb);

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

  137.         }

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

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

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

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

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

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

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

  145.         ast->deint_id = DEINT_ID_INT0;

  146.     } else {

  147.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  148.         int codecdata_length;

  149.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  164.         if (version == 5) {

  165.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  166.         }

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

  168.         avio_rb32(pb);

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

  170.         if (version == 5) {

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

  172.             avio_read(pb, buf, 4);

  173.             buf[4] = 0;

  174.         } else {

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

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

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

  178.         }

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

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

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

  182.                                                 st->codec->codec_tag);

  183. 

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

  185.         case AV_CODEC_ID_AC3:

  186.             st->need_parsing = AVSTREAM_PARSE_FULL;

  187.             break;

  188.         case AV_CODEC_ID_RA_288:

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

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

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

  192.             break;

  193.         case AV_CODEC_ID_COOK:

  194.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  195.         case AV_CODEC_ID_ATRAC3:

  196.         case AV_CODEC_ID_SIPR:

  197.             avio_rb16(pb); avio_r8(pb);

  198.             if (version == 5)

  199.                 avio_r8(pb);

  200.             codecdata_length = avio_rb32(pb);

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

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

  203.                 return -1;

  204.             }

  205. 

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

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

  208.                 if (flavor > 3) {

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

  210.                            flavor);

  211.                     return -1;

  212.                 }

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

  214.             } else {

  215.                 if(sub_packet_size <= 0){

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

  217.                     return -1;

  218.                 }

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

  220.             }

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

  222.                 return ret;

  223. 

  224.             break;

  225.         case AV_CODEC_ID_AAC:

  226.             avio_rb16(pb); avio_r8(pb);

  227.             if (version == 5)

  228.                 avio_r8(pb);

  229.             codecdata_length = avio_rb32(pb);

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

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

  232.                 return -1;

  233.             }

  234.             if (codecdata_length >= 1) {

  235.                 avio_r8(pb);

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

  237.                     return ret;

  238.             }

  239.             break;

  240.         default:

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

  242.         }

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

  244.             ast->deint_id == DEINT_ID_GENR ||

  245.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  249.                 return AVERROR_INVALIDDATA;

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

  251.                 return AVERROR(ENOMEM);

  252.         }

  253.         switch (ast->deint_id) {

  254.         case DEINT_ID_INT4:

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

  256.                 sub_packet_h <= 1 ||

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

  258.                 return AVERROR_INVALIDDATA;

  259.             break;

  260.         case DEINT_ID_GENR:

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

  262.                 ast->sub_packet_size > ast->audio_framesize)

  263.                 return AVERROR_INVALIDDATA;

  264.             break;

  265.         case DEINT_ID_SIPR:

  266.         case DEINT_ID_INT0:

  267.         case DEINT_ID_VBRS:

  268.         case DEINT_ID_VBRF:

  269.             break;

  270.         default:

  271.             av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);

  272.             return AVERROR_INVALIDDATA;

  273.         }

  274. 

  275.         if (read_all) {

  276.             avio_r8(pb);

  277.             avio_r8(pb);

  278.             avio_r8(pb);

  279.             rm_read_metadata(s, 0);

  280.         }

  281.     }

  282.     return 0;

  283. }

  284. 

  285. int

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

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

  288. {

  289.     unsigned int v;

  290.     int size;

  291.     int64_t codec_pos;

  292.     int ret;

  293. 

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

  295.     codec_pos = avio_tell(pb);

  296.     v = avio_rb32(pb);

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

  298.         /* ra type header */

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

  300.             return -1;

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

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

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

  304.             return ret;

  305. 

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

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

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

  309.                                                 st->codec->codec_tag);

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

  311.         int stream_count, rule_count, property_count, i;

  312.         ff_free_stream(s, st);

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

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

  315.             goto skip;

  316.         }

  317.         stream_count = avio_rb16(pb);

  318.         avio_skip(pb, 6*stream_count);

  319.         rule_count = avio_rb16(pb);

  320.         avio_skip(pb, 2*rule_count);

  321.         property_count = avio_rb16(pb);

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

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

  324.             avio_rb32(pb);

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

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

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

  328.             }

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

  330.             switch(avio_rb32(pb)) {

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

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

  333.                 break;

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

  335.             }

  336.         }

  337.     } else {

  338.         int fps;

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

  340.         fail1:

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

  342.             goto skip;

  343.         }

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

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

  346.                                                st->codec->codec_tag);

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

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

  349.             goto fail1;

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

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

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

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

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

  355.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  356.         fps = avio_rb32(pb);

  357. 

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

  359.             return ret;

  360. 

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

  362.                   0x10000, fps, (1 << 30) - 1);

  363. #if FF_API_R_FRAME_RATE

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

  365. #endif

  366.     }

  367. 

  368. skip:

  369.     /* skip codec info */

  370.     size = avio_tell(pb) - codec_pos;

  371.     avio_skip(pb, codec_data_size - size);

  372. 

  373.     return 0;

  374. }

  375. 

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

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

  378. static int rm_read_index(AVFormatContext *s)

  379. {

  380.     AVIOContext *pb = s->pb;

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

  382.     AVStream *st;

  383. 

  384.     do {

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

  386.             return -1;

  387.         size     = avio_rb32(pb);

  388.         if (size < 20)

  389.             return -1;

  390.         avio_skip(pb, 2);

  391.         n_pkts   = avio_rb32(pb);

  392.         str_id   = avio_rb16(pb);

  393.         next_off = avio_rb32(pb);

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

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

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

  397.                 break;

  398.             }

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

  400.             av_log(s, AV_LOG_ERROR,

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

  402.                    str_id, avio_tell(pb));

  403.             goto skip;

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

  405.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  410.             goto skip;

  411.         }

  412. 

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

  414.             avio_skip(pb, 2);

  415.             pts = avio_rb32(pb);

  416.             pos = avio_rb32(pb);

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

  418. 

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

  420.         }

  421. 

  422. skip:

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

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

  425.             av_log(s, AV_LOG_ERROR,

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

  427.             return -1;

  428.         }

  429.     } while (next_off);

  430. 

  431.     return 0;

  432. }

  433. 

  434. static int rm_read_header_old(AVFormatContext *s)

  435. {

  436.     RMDemuxContext *rm = s->priv_data;

  437.     AVStream *st;

  438. 

  439.     rm->old_format = 1;

  440.     st = avformat_new_stream(s, NULL);

  441.     if (!st)

  442.         return -1;

  443.     st->priv_data = ff_rm_alloc_rmstream();

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

  445. }

  446. 

  447. static int rm_read_header(AVFormatContext *s)

  448. {

  449.     RMDemuxContext *rm = s->priv_data;

  450.     AVStream *st;

  451.     AVIOContext *pb = s->pb;

  452.     unsigned int tag;

  453.     int tag_size;

  454.     unsigned int start_time, duration;

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

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

  457.     int flags = 0;

  458. 

  459.     tag = avio_rl32(pb);

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

  461.         /* very old .ra format */

  462.         return rm_read_header_old(s);

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

  464.         return AVERROR(EIO);

  465.     }

  466. 

  467.     tag_size = avio_rb32(pb);

  468.     avio_skip(pb, tag_size - 8);

  469. 

  470.     for(;;) {

  471.         if (url_feof(pb))

  472.             return -1;

  473.         tag = avio_rl32(pb);

  474.         tag_size = avio_rb32(pb);

  475.         avio_rb16(pb);

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

  477.                 (tag      ) & 0xff,

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

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

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

  481.                 tag,

  482.                 tag_size);

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

  484.             return -1;

  485.         switch(tag) {

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

  487.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  500.             break;

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

  502.             rm_read_metadata(s, 1);

  503.             break;

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

  505.             st = avformat_new_stream(s, NULL);

  506.             if (!st)

  507.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  516.             st->start_time = start_time;

  517.             st->duration = duration;

  518.             if(duration>0)

  519.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  523.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  526.                 return -1;

  527.             break;

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

  529.             goto header_end;

  530.         default:

  531.             /* unknown tag: skip it */

  532.             avio_skip(pb, tag_size - 10);

  533.             break;

  534.         }

  535.     }

  536.  header_end:

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

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

  539.         rm->nb_packets = 3600 * 25;

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

  541. 

  542.     if (!data_off)

  543.         data_off = avio_tell(pb) - 18;

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

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

  546.         rm_read_index(s);

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

  548.     }

  549. 

  550.     return 0;

  551. }

  552. 

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

  554. {

  555.     int n, n1;

  556. 

  557.     n = avio_rb16(pb);

  558.     (*len)-=2;

  559.     n &= 0x7FFF;

  560.     if (n >= 0x4000) {

  561.         return n - 0x4000;

  562.     } else {

  563.         n1 = avio_rb16(pb);

  564.         (*len)-=2;

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

  566.     }

  567. }

  568. 

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

  570. #define RAW_PACKET_SIZE 1000

  571. 

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

  573.     RMDemuxContext *rm = s->priv_data;

  574.     AVIOContext *pb = s->pb;

  575.     AVStream *st;

  576.     uint32_t state=0xFFFFFFFF;

  577. 

  578.     while(!url_feof(pb)){

  579.         int len, num, i;

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

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

  582.             num= rm->current_stream;

  583.             len= rm->remaining_len;

  584.             *timestamp = AV_NOPTS_VALUE;

  585.             *flags= 0;

  586.         }else{

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

  588. 

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

  590.                 int n_pkts, expected_len;

  591.                 len = avio_rb32(pb);

  592.                 avio_skip(pb, 2);

  593.                 n_pkts = avio_rb32(pb);

  594.                 expected_len = 20 + n_pkts * 14;

  595.                 if (len == 20)

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

  597.                     len = expected_len;

  598.                 else if (len != expected_len)

  599.                     av_log(s, AV_LOG_WARNING,

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

  601.                            len, n_pkts, expected_len);

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

  603.                 if(len<0)

  604.                     continue;

  605.                 goto skip;

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

  607.                 av_log(s, AV_LOG_WARNING,

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

  609.             }

  610. 

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

  612.                 continue;

  613.             len=state - 12;

  614.             state= 0xFFFFFFFF;

  615. 

  616.             num = avio_rb16(pb);

  617.             *timestamp = avio_rb32(pb);

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

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

  620.         }

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

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

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

  624.                 break;

  625.         }

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

  627. skip:

  628.             /* skip packet if unknown number */

  629.             avio_skip(pb, len);

  630.             rm->remaining_len = 0;

  631.             continue;

  632.         }

  633.         *stream_index= i;

  634. 

  635.         return len;

  636.     }

  637.     return -1;

  638. }

  639. 

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

  641.                                    RMDemuxContext *rm, RMStream *vst,

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

  643.                                    int64_t *timestamp)

  644. {

  645.     int hdr, seq, pic_num, len2, pos;

  646.     int type;

  647. 

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

  649.     type = hdr >> 6;

  650. 

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

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

  653.     }

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

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

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

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

  658.     }

  659.     if(len<0)

  660.         return -1;

  661.     rm->remaining_len = len;

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

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

  664.             len= len2;

  665.             *timestamp = pos;

  666.         }

  667.         if(rm->remaining_len < len)

  668.             return -1;

  669.         rm->remaining_len -= len;

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

  671.             return AVERROR(EIO);

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

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

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

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

  676.         return 0;

  677.     }

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

  679. 

  680.     *pseq = seq;

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

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

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

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

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

  686.             return AVERROR(ENOMEM);

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

  688.         vst->cur_slice = 0;

  689.         vst->curpic_num = pic_num;

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

  691.     }

  692.     if(type == 2)

  693.         len = FFMIN(len, pos);

  694. 

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

  696.         return 1;

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

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

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

  700.         return 1;

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

  702.         return AVERROR(EIO);

  703.     vst->videobufpos += len;

  704.     rm->remaining_len-= len;

  705. 

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

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

  708.         *pkt= vst->pkt;

  709.         vst->pkt.data= NULL;

  710.         vst->pkt.size= 0;

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

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

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

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

  715.         pkt->pts = AV_NOPTS_VALUE;

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

  717.         vst->slices = 0;

  718.         return 0;

  719.     }

  720. 

  721.     return 1;

  722. }

  723. 

  724. static inline void

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

  726. {

  727.     uint8_t *ptr;

  728.     int j;

  729. 

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

  731.         ptr = pkt->data;

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

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

  734.             ptr += 2;

  735.         }

  736.     }

  737. }

  738. 

  739. int

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

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

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

  743. {

  744.     RMDemuxContext *rm = s->priv_data;

  745. 

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

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

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

  749.             return -1; //got partial frame

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

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

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

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

  754.             int x;

  755.             int sps = ast->sub_packet_size;

  756.             int cfs = ast->coded_framesize;

  757.             int h = ast->sub_packet_h;

  758.             int y = ast->sub_packet_cnt;

  759.             int w = ast->audio_framesize;

  760. 

  761.             if (flags & 2)

  762.                 y = ast->sub_packet_cnt = 0;

  763.             if (!y)

  764.                 ast->audiotimestamp = timestamp;

  765. 

  766.             switch (ast->deint_id) {

  767.                 case DEINT_ID_INT4:

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

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

  770.                     break;

  771.                 case DEINT_ID_GENR:

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

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

  774.                     break;

  775.                 case DEINT_ID_SIPR:

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

  777.                     break;

  778.             }

  779. 

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

  781.                 return -1;

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

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

  784. 

  785.              ast->sub_packet_cnt = 0;

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

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

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

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

  790.             int x;

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

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

  793.             if (ast->sub_packet_cnt) {

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

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

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

  797.                 ast->audiotimestamp = timestamp;

  798.             } else

  799.                 return -1;

  800.         } else {

  801.             av_get_packet(pb, pkt, len);

  802.             rm_ac3_swap_bytes(st, pkt);

  803.         }

  804.     } else

  805.         av_get_packet(pb, pkt, len);

  806. 

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

  808. 

  809. #if 0

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

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

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

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

  814. 

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

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

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

  818.         }

  819.     }

  820. #endif

  821. 

  822.     pkt->pts = timestamp;

  823.     if (flags & 2)

  824.         pkt->flags |= AV_PKT_FLAG_KEY;

  825. 

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

  827. }

  828. 

  829. int

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

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

  832. {

  833.     RMDemuxContext *rm = s->priv_data;

  834. 

  835.     assert (rm->audio_pkt_cnt > 0);

  836. 

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

  838.         ast->deint_id == DEINT_ID_VBRS)

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

  840.     else {

  841.         av_new_packet(pkt, st->codec->block_align);

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

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

  844.                st->codec->block_align);

  845.     }

  846.     rm->audio_pkt_cnt--;

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

  848.         ast->audiotimestamp = AV_NOPTS_VALUE;

  849.         pkt->flags = AV_PKT_FLAG_KEY;

  850.     } else

  851.         pkt->flags = 0;

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

  853. 

  854.     return rm->audio_pkt_cnt;

  855. }

  856. 

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

  858. {

  859.     RMDemuxContext *rm = s->priv_data;

  860.     AVStream *st;

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

  862.     int64_t timestamp, pos;

  863.     int flags;

  864. 

  865.     for (;;) {

  866.         if (rm->audio_pkt_cnt) {

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

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

  869.             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);

  870.             flags = 0;

  871.         } else {

  872.             if (rm->old_format) {

  873.                 RMStream *ast;

  874. 

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

  876.                 ast = st->priv_data;

  877.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  882.             } else {

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

  884.                 if (len > 0)

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

  886.             }

  887. 

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

  889.                 return AVERROR(EIO);

  890. 

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

  892.                                       &seq, flags, timestamp);

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

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

  895.             if (res)

  896.                 continue;

  897.         }

  898. 

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

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

  901.             av_free_packet(pkt);

  902.         } else

  903.             break;

  904.     }

  905. 

  906.     return 0;

  907. }

  908. 

  909. static int rm_read_close(AVFormatContext *s)

  910. {

  911.     int i;

  912. 

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

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

  915. 

  916.     return 0;

  917. }

  918. 

  919. static int rm_probe(AVProbeData *p)

  920. {

  921.     /* check file header */

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

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

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

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

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

  927.         return AVPROBE_SCORE_MAX;

  928.     else

  929.         return 0;

  930. }

  931. 

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

  933.                                int64_t *ppos, int64_t pos_limit)

  934. {

  935.     RMDemuxContext *rm = s->priv_data;

  936.     int64_t pos, dts;

  937.     int stream_index2, flags, len, h;

  938. 

  939.     pos = *ppos;

  940. 

  941.     if(rm->old_format)

  942.         return AV_NOPTS_VALUE;

  943. 

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

  945.         return AV_NOPTS_VALUE;

  946. 

  947.     rm->remaining_len=0;

  948.     for(;;){

  949.         int seq=1;

  950.         AVStream *st;

  951. 

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

  953.         if(len<0)

  954.             return AV_NOPTS_VALUE;

  955. 

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

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

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

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

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

  961.             }

  962.         }

  963. 

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

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

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

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

  968.             if(stream_index2 == stream_index)

  969.                 break;

  970.         }

  971. 

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

  973.     }

  974.     *ppos = pos;

  975.     return dts;

  976. }

  977. 

  978. AVInputFormat ff_rm_demuxer = {

  979.     .name           = "rm",

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

  981.     .priv_data_size = sizeof(RMDemuxContext),

  982.     .read_probe     = rm_probe,

  983.     .read_header    = rm_read_header,

  984.     .read_packet    = rm_read_packet,

  985.     .read_close     = rm_read_close,

  986.     .read_timestamp = rm_read_dts,

  987. };

  988. 

  989. AVInputFormat ff_rdt_demuxer = {

  990.     .name           = "rdt",

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

  992.     .priv_data_size = sizeof(RMDemuxContext),

  993.     .read_close     = rm_read_close,

  994.     .flags          = AVFMT_NOFILE,

  995. };