libavformat/rmdec.c

   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 "avformat.h"
  25 #include "riff.h"
  26 #include "rm.h"
  27
  28 struct RMStream {
  29     AVPacket pkt;      ///< place to store merged video frame / reordered audio data
  30     int videobufsize;  ///< current assembled frame size
  31     int videobufpos;   ///< position for the next slice in the video buffer
  32     int curpic_num;    ///< picture number of current frame
  33     int cur_slice, slices;
  34     int64_t pktpos;    ///< first slice position in file
  35     /// Audio descrambling matrix parameters
  36     int64_t audiotimestamp; ///< Audio packet timestamp
  37     int sub_packet_cnt; // Subpacket counter, used while reading
  38     int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
  39     int audio_framesize; /// Audio frame size from container
  40     int sub_packet_lengths[16]; /// Length of each subpacket
  41 };
  42
  43 typedef struct {
  44     int nb_packets;
  45     int old_format;
  46     int current_stream;
  47     int remaining_len;
  48     int audio_stream_num; ///< Stream number for audio packets
  49     int audio_pkt_cnt; ///< Output packet counter
  50 } RMDemuxContext;
  51
  52 static const AVCodecTag rm_codec_tags[] = {
  53     { CODEC_ID_RV10,   MKTAG('R','V','1','0') },
  54     { CODEC_ID_RV20,   MKTAG('R','V','2','0') },
  55     { CODEC_ID_RV20,   MKTAG('R','V','T','R') },
  56     { CODEC_ID_RV30,   MKTAG('R','V','3','0') },
  57     { CODEC_ID_RV40,   MKTAG('R','V','4','0') },
  58     { CODEC_ID_AC3,    MKTAG('d','n','e','t') },
  59     { CODEC_ID_RA_144, MKTAG('l','p','c','J') },
  60     { CODEC_ID_RA_288, MKTAG('2','8','_','8') },
  61     { CODEC_ID_COOK,   MKTAG('c','o','o','k') },
  62     { CODEC_ID_ATRAC3, MKTAG('a','t','r','c') },
  63     { CODEC_ID_SIPR,   MKTAG('s','i','p','r') },
  64     { CODEC_ID_AAC,    MKTAG('r','a','a','c') },
  65     { CODEC_ID_AAC,    MKTAG('r','a','c','p') },
  66     { CODEC_ID_NONE },
  67 };
  68
  69 static const unsigned char sipr_swaps[38][2] = {
  70     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
  71     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
  72     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
  73     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
  74     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
  75     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
  76     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
  77     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
  78     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
  79     { 67, 83 }, { 77, 80 }
  80 };
  81
  82 const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
  83
  84 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
  85 {
  86     int i;
  87     char *q, r;
  88
  89     q = buf;
  90     for(i=0;i<len;i++) {
  91         r = get_byte(pb);
  92         if (i < buf_size - 1)
  93             *q++ = r;
  94     }
  95     if (buf_size > 0) *q = '\0';
  96 }
  97
  98 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
  99 {
 100     get_strl(pb, buf, buf_size, get_byte(pb));
 101 }
 102
 103 static int rm_read_extradata(ByteIOContext *pb, AVCodecContext *avctx, unsigned size)
 104 {
 105     if (size >= 1<<24)
 106         return -1;
 107     avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
 108     if (!avctx->extradata)
 109         return AVERROR_NOMEM;
 110     avctx->extradata_size = get_buffer(pb, avctx->extradata, size);
 111     memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 112     if (avctx->extradata_size != size)
 113         return AVERROR(EIO);
 114     return 0;
 115 }
 116
 117 static void rm_read_metadata(AVFormatContext *s, int wide)
 118 {
 119     char buf[1024];
 120     int i;
 121     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
 122         int len = wide ? get_be16(s->pb) : get_byte(s->pb);
 123         get_strl(s->pb, buf, sizeof(buf), len);
 124         av_metadata_set(&s->metadata, ff_rm_metadata[i], buf);
 125     }
 126 }
 127
 128 RMStream *ff_rm_alloc_rmstream (void)
 129 {
 130     RMStream *rms = av_mallocz(sizeof(RMStream));
 131     rms->curpic_num = -1;
 132     return rms;
 133 }
 134
 135 void ff_rm_free_rmstream (RMStream *rms)
 136 {
 137     av_free_packet(&rms->pkt);
 138 }
 139
 140 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
 141                                      AVStream *st, RMStream *ast, int read_all)
 142 {
 143     char buf[256];
 144     uint32_t version;
 145     int ret;
 146
 147     /* ra type header */
 148     version = get_be16(pb); /* version */
 149     if (version == 3) {
 150         int header_size = get_be16(pb);
 151         int64_t startpos = url_ftell(pb);
 152         url_fskip(pb, 14);
 153         rm_read_metadata(s, 0);
 154         if ((startpos + header_size) >= url_ftell(pb) + 2) {
 155             // fourcc (should always be "lpcJ")
 156             get_byte(pb);
 157             get_str8(pb, buf, sizeof(buf));
 158         }
 159         // Skip extra header crap (this should never happen)
 160         if ((startpos + header_size) > url_ftell(pb))
 161             url_fskip(pb, header_size + startpos - url_ftell(pb));
 162         st->codec->sample_rate = 8000;
 163         st->codec->channels = 1;
 164         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 165         st->codec->codec_id = CODEC_ID_RA_144;
 166     } else {
 167         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
 168         int codecdata_length;
 169         /* old version (4) */
 170         url_fskip(pb, 2); /* unused */
 171         get_be32(pb); /* .ra4 */
 172         get_be32(pb); /* data size */
 173         get_be16(pb); /* version2 */
 174         get_be32(pb); /* header size */
 175         flavor= get_be16(pb); /* add codec info / flavor */
 176         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
 177         get_be32(pb); /* ??? */
 178         get_be32(pb); /* ??? */
 179         get_be32(pb); /* ??? */
 180         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
 181         st->codec->block_align= get_be16(pb); /* frame size */
 182         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
 183         get_be16(pb); /* ??? */
 184         if (version == 5) {
 185             get_be16(pb); get_be16(pb); get_be16(pb);
 186         }
 187         st->codec->sample_rate = get_be16(pb);
 188         get_be32(pb);
 189         st->codec->channels = get_be16(pb);
 190         if (version == 5) {
 191             get_be32(pb);
 192             get_buffer(pb, buf, 4);
 193             buf[4] = 0;
 194         } else {
 195             get_str8(pb, buf, sizeof(buf)); /* desc */
 196             get_str8(pb, buf, sizeof(buf)); /* desc */
 197         }
 198         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 199         st->codec->codec_tag  = AV_RL32(buf);
 200         st->codec->codec_id   = ff_codec_get_id(rm_codec_tags, st->codec->codec_tag);
 201         switch (st->codec->codec_id) {
 202         case CODEC_ID_AC3:
 203             st->need_parsing = AVSTREAM_PARSE_FULL;
 204             break;
 205         case CODEC_ID_RA_288:
 206             st->codec->extradata_size= 0;
 207             ast->audio_framesize = st->codec->block_align;
 208             st->codec->block_align = coded_framesize;
 209
 210             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 211                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
 212                 return -1;
 213             }
 214
 215             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 216             break;
 217         case CODEC_ID_COOK:
 218         case CODEC_ID_ATRAC3:
 219         case CODEC_ID_SIPR:
 220             get_be16(pb); get_byte(pb);
 221             if (version == 5)
 222                 get_byte(pb);
 223             codecdata_length = get_be32(pb);
 224             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 225                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 226                 return -1;
 227             }
 228
 229             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
 230             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
 231             else st->codec->codec_id = CODEC_ID_ATRAC3;
 232
 233             ast->audio_framesize = st->codec->block_align;
 234             if (st->codec->codec_id == CODEC_ID_SIPR) {
 235                 if (flavor > 3) {
 236                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
 237                            flavor);
 238                     return -1;
 239                 }
 240                 st->codec->block_align = ff_sipr_subpk_size[flavor];
 241             } else {
 242                 if(sub_packet_size <= 0){
 243                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
 244                     return -1;
 245                 }
 246                 st->codec->block_align = ast->sub_packet_size;
 247             }
 248             if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
 249                 return ret;
 250
 251             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 252                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 253                 return -1;
 254             }
 255
 256             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 257             break;
 258         case CODEC_ID_AAC:
 259             get_be16(pb); get_byte(pb);
 260             if (version == 5)
 261                 get_byte(pb);
 262             st->codec->codec_id = CODEC_ID_AAC;
 263             codecdata_length = get_be32(pb);
 264             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 265                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 266                 return -1;
 267             }
 268             if (codecdata_length >= 1) {
 269                 get_byte(pb);
 270                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
 271                     return ret;
 272             }
 273             break;
 274         default:
 275             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
 276         }
 277         if (read_all) {
 278             get_byte(pb);
 279             get_byte(pb);
 280             get_byte(pb);
 281             rm_read_metadata(s, 0);
 282         }
 283     }
 284     return 0;
 285 }
 286
 287 int
 288 ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
 289                            AVStream *st, RMStream *rst, int codec_data_size)
 290 {
 291     unsigned int v;
 292     int size;
 293     int64_t codec_pos;
 294     int ret;
 295
 296     av_set_pts_info(st, 64, 1, 1000);
 297     codec_pos = url_ftell(pb);
 298     v = get_be32(pb);
 299     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
 300         /* ra type header */
 301         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
 302             return -1;
 303     } else {
 304         int fps, fps2;
 305         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
 306         fail1:
 307             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
 308             goto skip;
 309         }
 310         st->codec->codec_tag = get_le32(pb);
 311         st->codec->codec_id  = ff_codec_get_id(rm_codec_tags, st->codec->codec_tag);
 312 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
 313         if (st->codec->codec_id == CODEC_ID_NONE)
 314             goto fail1;
 315         st->codec->width = get_be16(pb);
 316         st->codec->height = get_be16(pb);
 317         st->codec->time_base.num= 1;
 318         fps= get_be16(pb);
 319         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 320         get_be32(pb);
 321         fps2= get_be16(pb);
 322         get_be16(pb);
 323
 324         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (url_ftell(pb) - codec_pos))) < 0)
 325             return ret;
 326
 327 //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
 328         st->codec->time_base.den = fps * st->codec->time_base.num;
 329         //XXX: do we really need that?
 330         switch(st->codec->extradata[4]>>4){
 331         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
 332         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
 333         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
 334         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
 335         default:
 336             av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", st->codec->extradata[0], st->codec->extradata[1], st->codec->extradata[2], st->codec->extradata[3], st->codec->extradata[4]);
 337             goto fail1;
 338         }
 339     }
 340
 341 skip:
 342     /* skip codec info */
 343     size = url_ftell(pb) - codec_pos;
 344     url_fskip(pb, codec_data_size - size);
 345
 346     return 0;
 347 }
 348
 349 /** this function assumes that the demuxer has already seeked to the start
 350  * of the INDX chunk, and will bail out if not. */
 351 static int rm_read_index(AVFormatContext *s)
 352 {
 353     ByteIOContext *pb = s->pb;
 354     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
 355     AVStream *st;
 356
 357     do {
 358         if (get_le32(pb) != MKTAG('I','N','D','X'))
 359             return -1;
 360         size     = get_be32(pb);
 361         if (size < 20)
 362             return -1;
 363         url_fskip(pb, 2);
 364         n_pkts   = get_be32(pb);
 365         str_id   = get_be16(pb);
 366         next_off = get_be32(pb);
 367         for (n = 0; n < s->nb_streams; n++)
 368             if (s->streams[n]->id == str_id) {
 369                 st = s->streams[n];
 370                 break;
 371             }
 372         if (n == s->nb_streams)
 373             goto skip;
 374
 375         for (n = 0; n < n_pkts; n++) {
 376             url_fskip(pb, 2);
 377             pts = get_be32(pb);
 378             pos = get_be32(pb);
 379             url_fskip(pb, 4); /* packet no. */
 380
 381             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
 382         }
 383
 384 skip:
 385         if (next_off && url_ftell(pb) != next_off &&
 386             url_fseek(pb, next_off, SEEK_SET) < 0)
 387             return -1;
 388     } while (next_off);
 389
 390     return 0;
 391 }
 392
 393 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 394 {
 395     RMDemuxContext *rm = s->priv_data;
 396     AVStream *st;
 397
 398     rm->old_format = 1;
 399     st = av_new_stream(s, 0);
 400     if (!st)
 401         return -1;
 402     st->priv_data = ff_rm_alloc_rmstream();
 403     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
 404 }
 405
 406 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 407 {
 408     RMDemuxContext *rm = s->priv_data;
 409     AVStream *st;
 410     ByteIOContext *pb = s->pb;
 411     unsigned int tag;
 412     int tag_size;
 413     unsigned int start_time, duration;
 414     unsigned int data_off = 0, indx_off = 0;
 415     char buf[128];
 416     int flags = 0;
 417
 418     tag = get_le32(pb);
 419     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 420         /* very old .ra format */
 421         return rm_read_header_old(s, ap);
 422     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 423         return AVERROR(EIO);
 424     }
 425
 426     get_be32(pb); /* header size */
 427     get_be16(pb);
 428     get_be32(pb);
 429     get_be32(pb); /* number of headers */
 430
 431     for(;;) {
 432         if (url_feof(pb))
 433             return -1;
 434         tag = get_le32(pb);
 435         tag_size = get_be32(pb);
 436         get_be16(pb);
 437 #if 0
 438         printf("tag=%c%c%c%c (%08x) size=%d\n",
 439                (tag) & 0xff,
 440                (tag >> 8) & 0xff,
 441                (tag >> 16) & 0xff,
 442                (tag >> 24) & 0xff,
 443                tag,
 444                tag_size);
 445 #endif
 446         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 447             return -1;
 448         switch(tag) {
 449         case MKTAG('P', 'R', 'O', 'P'):
 450             /* file header */
 451             get_be32(pb); /* max bit rate */
 452             get_be32(pb); /* avg bit rate */
 453             get_be32(pb); /* max packet size */
 454             get_be32(pb); /* avg packet size */
 455             get_be32(pb); /* nb packets */
 456             get_be32(pb); /* duration */
 457             get_be32(pb); /* preroll */
 458             indx_off = get_be32(pb); /* index offset */
 459             data_off = get_be32(pb); /* data offset */
 460             get_be16(pb); /* nb streams */
 461             flags = get_be16(pb); /* flags */
 462             break;
 463         case MKTAG('C', 'O', 'N', 'T'):
 464             rm_read_metadata(s, 1);
 465             break;
 466         case MKTAG('M', 'D', 'P', 'R'):
 467             st = av_new_stream(s, 0);
 468             if (!st)
 469                 return AVERROR(ENOMEM);
 470             st->id = get_be16(pb);
 471             get_be32(pb); /* max bit rate */
 472             st->codec->bit_rate = get_be32(pb); /* bit rate */
 473             get_be32(pb); /* max packet size */
 474             get_be32(pb); /* avg packet size */
 475             start_time = get_be32(pb); /* start time */
 476             get_be32(pb); /* preroll */
 477             duration = get_be32(pb); /* duration */
 478             st->start_time = start_time;
 479             st->duration = duration;
 480             get_str8(pb, buf, sizeof(buf)); /* desc */
 481             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 482             st->codec->codec_type = AVMEDIA_TYPE_DATA;
 483             st->priv_data = ff_rm_alloc_rmstream();
 484             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
 485                                           get_be32(pb)) < 0)
 486                 return -1;
 487             break;
 488         case MKTAG('D', 'A', 'T', 'A'):
 489             goto header_end;
 490         default:
 491             /* unknown tag: skip it */
 492             url_fskip(pb, tag_size - 10);
 493             break;
 494         }
 495     }
 496  header_end:
 497     rm->nb_packets = get_be32(pb); /* number of packets */
 498     if (!rm->nb_packets && (flags & 4))
 499         rm->nb_packets = 3600 * 25;
 500     get_be32(pb); /* next data header */
 501
 502     if (!data_off)
 503         data_off = url_ftell(pb) - 18;
 504     if (indx_off && url_fseek(pb, indx_off, SEEK_SET) >= 0) {
 505         rm_read_index(s);
 506         url_fseek(pb, data_off + 18, SEEK_SET);
 507     }
 508
 509     return 0;
 510 }
 511
 512 static int get_num(ByteIOContext *pb, int *len)
 513 {
 514     int n, n1;
 515
 516     n = get_be16(pb);
 517     (*len)-=2;
 518     n &= 0x7FFF;
 519     if (n >= 0x4000) {
 520         return n - 0x4000;
 521     } else {
 522         n1 = get_be16(pb);
 523         (*len)-=2;
 524         return (n << 16) | n1;
 525     }
 526 }
 527
 528 /* multiple of 20 bytes for ra144 (ugly) */
 529 #define RAW_PACKET_SIZE 1000
 530
 531 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 532     RMDemuxContext *rm = s->priv_data;
 533     ByteIOContext *pb = s->pb;
 534     AVStream *st;
 535     uint32_t state=0xFFFFFFFF;
 536
 537     while(!url_feof(pb)){
 538         int len, num, res, i;
 539         *pos= url_ftell(pb) - 3;
 540         if(rm->remaining_len > 0){
 541             num= rm->current_stream;
 542             len= rm->remaining_len;
 543             *timestamp = AV_NOPTS_VALUE;
 544             *flags= 0;
 545         }else{
 546             state= (state<<8) + get_byte(pb);
 547
 548             if(state == MKBETAG('I', 'N', 'D', 'X')){
 549                 int n_pkts, expected_len;
 550                 len = get_be32(pb);
 551                 url_fskip(pb, 2);
 552                 n_pkts = get_be32(pb);
 553                 expected_len = 20 + n_pkts * 14;
 554                 if (len == 20)
 555                     /* some files don't add index entries to chunk size... */
 556                     len = expected_len;
 557                 else if (len != expected_len)
 558                     av_log(s, AV_LOG_WARNING,
 559                            "Index size %d (%d pkts) is wrong, should be %d.\n",
 560                            len, n_pkts, expected_len);
 561                 len -= 14; // we already read part of the index header
 562                 if(len<0)
 563                     continue;
 564                 goto skip;
 565             } else if (state == MKBETAG('D','A','T','A')) {
 566                 av_log(s, AV_LOG_WARNING,
 567                        "DATA tag in middle of chunk, file may be broken.\n");
 568             }
 569
 570             if(state > (unsigned)0xFFFF || state <= 12)
 571                 continue;
 572             len=state - 12;
 573             state= 0xFFFFFFFF;
 574
 575             num = get_be16(pb);
 576             *timestamp = get_be32(pb);
 577             res= get_byte(pb); /* reserved */
 578             *flags = get_byte(pb); /* flags */
 579         }
 580         for(i=0;i<s->nb_streams;i++) {
 581             st = s->streams[i];
 582             if (num == st->id)
 583                 break;
 584         }
 585         if (i == s->nb_streams) {
 586 skip:
 587             /* skip packet if unknown number */
 588             url_fskip(pb, len);
 589             rm->remaining_len = 0;
 590             continue;
 591         }
 592         *stream_index= i;
 593
 594         return len;
 595     }
 596     return -1;
 597 }
 598
 599 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
 600                                    RMDemuxContext *rm, RMStream *vst,
 601                                    AVPacket *pkt, int len, int *pseq)
 602 {
 603     int hdr, seq, pic_num, len2, pos;
 604     int type;
 605
 606     hdr = get_byte(pb); len--;
 607     type = hdr >> 6;
 608
 609     if(type != 3){  // not frame as a part of packet
 610         seq = get_byte(pb); len--;
 611     }
 612     if(type != 1){  // not whole frame
 613         len2 = get_num(pb, &len);
 614         pos  = get_num(pb, &len);
 615         pic_num = get_byte(pb); len--;
 616     }
 617     if(len<0)
 618         return -1;
 619     rm->remaining_len = len;
 620     if(type&1){     // frame, not slice
 621         if(type == 3)  // frame as a part of packet
 622             len= len2;
 623         if(rm->remaining_len < len)
 624             return -1;
 625         rm->remaining_len -= len;
 626         if(av_new_packet(pkt, len + 9) < 0)
 627             return AVERROR(EIO);
 628         pkt->data[0] = 0;
 629         AV_WL32(pkt->data + 1, 1);
 630         AV_WL32(pkt->data + 5, 0);
 631         get_buffer(pb, pkt->data + 9, len);
 632         return 0;
 633     }
 634     //now we have to deal with single slice
 635
 636     *pseq = seq;
 637     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
 638         vst->slices = ((hdr & 0x3F) << 1) + 1;
 639         vst->videobufsize = len2 + 8*vst->slices + 1;
 640         av_free_packet(&vst->pkt); //FIXME this should be output.
 641         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
 642             return AVERROR(ENOMEM);
 643         vst->videobufpos = 8*vst->slices + 1;
 644         vst->cur_slice = 0;
 645         vst->curpic_num = pic_num;
 646         vst->pktpos = url_ftell(pb);
 647     }
 648     if(type == 2)
 649         len = FFMIN(len, pos);
 650
 651     if(++vst->cur_slice > vst->slices)
 652         return 1;
 653     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
 654     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
 655     if(vst->videobufpos + len > vst->videobufsize)
 656         return 1;
 657     if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
 658         return AVERROR(EIO);
 659     vst->videobufpos += len;
 660     rm->remaining_len-= len;
 661
 662     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
 663         vst->pkt.data[0] = vst->cur_slice-1;
 664         *pkt= vst->pkt;
 665         vst->pkt.data= NULL;
 666         vst->pkt.size= 0;
 667         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
 668             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
 669                 vst->videobufpos - 1 - 8*vst->slices);
 670         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
 671         pkt->pts = AV_NOPTS_VALUE;
 672         pkt->pos = vst->pktpos;
 673         vst->slices = 0;
 674         return 0;
 675     }
 676
 677     return 1;
 678 }
 679
 680 static inline void
 681 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
 682 {
 683     uint8_t *ptr;
 684     int j;
 685
 686     if (st->codec->codec_id == CODEC_ID_AC3) {
 687         ptr = pkt->data;
 688         for (j=0;j<pkt->size;j+=2) {
 689             FFSWAP(int, ptr[0], ptr[1]);
 690             ptr += 2;
 691         }
 692     }
 693 }
 694
 695 /**
 696  * Perform 4-bit block reordering for SIPR data.
 697  * @todo This can be optimized, e.g. use memcpy() if data blocks are aligned
 698  */
 699 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
 700 {
 701     int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
 702
 703     for (n = 0; n < 38; n++) {
 704         int j;
 705         int i = bs * sipr_swaps[n][0];
 706         int o = bs * sipr_swaps[n][1];
 707
 708         /* swap 4bit-nibbles of block 'i' with 'o' */
 709         for (j = 0; j < bs; j++, i++, o++) {
 710             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
 711                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
 712
 713             buf[o >> 1] = (x << (4 * (o & 1))) |
 714                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
 715             buf[i >> 1] = (y << (4 * (i & 1))) |
 716                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
 717         }
 718     }
 719 }
 720
 721 int
 722 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
 723                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
 724                     int *seq, int flags, int64_t timestamp)
 725 {
 726     RMDemuxContext *rm = s->priv_data;
 727
 728     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 729         rm->current_stream= st->id;
 730         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
 731             return -1; //got partial frame
 732     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 733         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
 734             (st->codec->codec_id == CODEC_ID_COOK) ||
 735             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
 736             (st->codec->codec_id == CODEC_ID_SIPR)) {
 737             int x;
 738             int sps = ast->sub_packet_size;
 739             int cfs = ast->coded_framesize;
 740             int h = ast->sub_packet_h;
 741             int y = ast->sub_packet_cnt;
 742             int w = ast->audio_framesize;
 743
 744             if (flags & 2)
 745                 y = ast->sub_packet_cnt = 0;
 746             if (!y)
 747                 ast->audiotimestamp = timestamp;
 748
 749             switch(st->codec->codec_id) {
 750                 case CODEC_ID_RA_288:
 751                     for (x = 0; x < h/2; x++)
 752                         get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
 753                     break;
 754                 case CODEC_ID_ATRAC3:
 755                 case CODEC_ID_COOK:
 756                     for (x = 0; x < w/sps; x++)
 757                         get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 758                     break;
 759                 case CODEC_ID_SIPR:
 760                     get_buffer(pb, ast->pkt.data + y * w, w);
 761                     break;
 762             }
 763
 764             if (++(ast->sub_packet_cnt) < h)
 765                 return -1;
 766             if (st->codec->codec_id == CODEC_ID_SIPR)
 767                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
 768
 769              ast->sub_packet_cnt = 0;
 770              rm->audio_stream_num = st->index;
 771              rm->audio_pkt_cnt = h * w / st->codec->block_align;
 772         } else if (st->codec->codec_id == CODEC_ID_AAC) {
 773             int x;
 774             rm->audio_stream_num = st->index;
 775             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
 776             if (ast->sub_packet_cnt) {
 777                 for (x = 0; x < ast->sub_packet_cnt; x++)
 778                     ast->sub_packet_lengths[x] = get_be16(pb);
 779                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
 780                 ast->audiotimestamp = timestamp;
 781             } else
 782                 return -1;
 783         } else {
 784             av_get_packet(pb, pkt, len);
 785             rm_ac3_swap_bytes(st, pkt);
 786         }
 787     } else
 788         av_get_packet(pb, pkt, len);
 789
 790     pkt->stream_index = st->index;
 791
 792 #if 0
 793     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 794         if(st->codec->codec_id == CODEC_ID_RV20){
 795             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 796             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
 797
 798             seq |= (timestamp&~0x3FFF);
 799             if(seq - timestamp >  0x2000) seq -= 0x4000;
 800             if(seq - timestamp < -0x2000) seq += 0x4000;
 801         }
 802     }
 803 #endif
 804
 805     pkt->pts= timestamp;
 806     if (flags & 2)
 807         pkt->flags |= AV_PKT_FLAG_KEY;
 808
 809     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
 810 }
 811
 812 int
 813 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
 814                       AVStream *st, RMStream *ast, AVPacket *pkt)
 815 {
 816     RMDemuxContext *rm = s->priv_data;
 817
 818     assert (rm->audio_pkt_cnt > 0);
 819
 820     if (st->codec->codec_id == CODEC_ID_AAC)
 821         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
 822     else {
 823         av_new_packet(pkt, st->codec->block_align);
 824         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
 825                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 826                st->codec->block_align);
 827     }
 828     rm->audio_pkt_cnt--;
 829     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
 830         ast->audiotimestamp = AV_NOPTS_VALUE;
 831         pkt->flags = AV_PKT_FLAG_KEY;
 832     } else
 833         pkt->flags = 0;
 834     pkt->stream_index = st->index;
 835
 836     return rm->audio_pkt_cnt;
 837 }
 838
 839 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 840 {
 841     RMDemuxContext *rm = s->priv_data;
 842     AVStream *st;
 843     int i, len, res, seq = 1;
 844     int64_t timestamp, pos;
 845     int flags;
 846
 847     for (;;) {
 848         if (rm->audio_pkt_cnt) {
 849             // If there are queued audio packet return them first
 850             st = s->streams[rm->audio_stream_num];
 851             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
 852         } else {
 853             if (rm->old_format) {
 854                 RMStream *ast;
 855
 856                 st = s->streams[0];
 857                 ast = st->priv_data;
 858                 timestamp = AV_NOPTS_VALUE;
 859                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
 860                     ast->coded_framesize * ast->sub_packet_h / 2;
 861                 flags = (seq++ == 1) ? 2 : 0;
 862             } else {
 863                 len=sync(s, &timestamp, &flags, &i, &pos);
 864                 if (len > 0)
 865                     st = s->streams[i];
 866             }
 867
 868             if(len<0 || url_feof(s->pb))
 869                 return AVERROR(EIO);
 870
 871             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
 872                                       &seq, flags, timestamp);
 873             if((flags&2) && (seq&0x7F) == 1)
 874                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 875             if (res)
 876                 continue;
 877         }
 878
 879         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
 880            || st->discard >= AVDISCARD_ALL){
 881             av_free_packet(pkt);
 882         } else
 883             break;
 884     }
 885
 886     return 0;
 887 }
 888
 889 static int rm_read_close(AVFormatContext *s)
 890 {
 891     int i;
 892
 893     for (i=0;i<s->nb_streams;i++)
 894         ff_rm_free_rmstream(s->streams[i]->priv_data);
 895
 896     return 0;
 897 }
 898
 899 static int rm_probe(AVProbeData *p)
 900 {
 901     /* check file header */
 902     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 903          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 904          p->buf[4] == 0 && p->buf[5] == 0) ||
 905         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 906          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 907         return AVPROBE_SCORE_MAX;
 908     else
 909         return 0;
 910 }
 911
 912 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 913                                int64_t *ppos, int64_t pos_limit)
 914 {
 915     RMDemuxContext *rm = s->priv_data;
 916     int64_t pos, dts;
 917     int stream_index2, flags, len, h;
 918
 919     pos = *ppos;
 920
 921     if(rm->old_format)
 922         return AV_NOPTS_VALUE;
 923
 924     url_fseek(s->pb, pos, SEEK_SET);
 925     rm->remaining_len=0;
 926     for(;;){
 927         int seq=1;
 928         AVStream *st;
 929
 930         len=sync(s, &dts, &flags, &stream_index2, &pos);
 931         if(len<0)
 932             return AV_NOPTS_VALUE;
 933
 934         st = s->streams[stream_index2];
 935         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 936             h= get_byte(s->pb); len--;
 937             if(!(h & 0x40)){
 938                 seq = get_byte(s->pb); len--;
 939             }
 940         }
 941
 942         if((flags&2) && (seq&0x7F) == 1){
 943 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
 944             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 945             if(stream_index2 == stream_index)
 946                 break;
 947         }
 948
 949         url_fskip(s->pb, len);
 950     }
 951     *ppos = pos;
 952     return dts;
 953 }
 954
 955 AVInputFormat rm_demuxer = {
 956     "rm",
 957     NULL_IF_CONFIG_SMALL("RealMedia format"),
 958     sizeof(RMDemuxContext),
 959     rm_probe,
 960     rm_read_header,
 961     rm_read_packet,
 962     rm_read_close,
 963     NULL,
 964     rm_read_dts,
 965 };
 966
 967 AVInputFormat rdt_demuxer = {
 968     "rdt",
 969     NULL_IF_CONFIG_SMALL("RDT demuxer"),
 970     sizeof(RMDemuxContext),
 971     NULL,
 972     NULL,
 973     NULL,
 974     rm_read_close,
 975 };