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 "rm.h"
  26
  27 struct RMStream {
  28     AVPacket pkt;      ///< place to store merged video frame / reordered audio data
  29     int videobufsize;  ///< current assembled frame size
  30     int videobufpos;   ///< position for the next slice in the video buffer
  31     int curpic_num;    ///< picture number of current frame
  32     int cur_slice, slices;
  33     int64_t pktpos;    ///< first slice position in file
  34     /// Audio descrambling matrix parameters
  35     int64_t audiotimestamp; ///< Audio packet timestamp
  36     int sub_packet_cnt; // Subpacket counter, used while reading
  37     int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
  38     int audio_framesize; /// Audio frame size from container
  39     int sub_packet_lengths[16]; /// Length of each subpacket
  40 };
  41
  42 typedef struct {
  43     int nb_packets;
  44     int old_format;
  45     int current_stream;
  46     int remaining_len;
  47     int audio_stream_num; ///< Stream number for audio packets
  48     int audio_pkt_cnt; ///< Output packet counter
  49 } RMDemuxContext;
  50
  51 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
  52 {
  53     int i;
  54     char *q, r;
  55
  56     q = buf;
  57     for(i=0;i<len;i++) {
  58         r = get_byte(pb);
  59         if (i < buf_size - 1)
  60             *q++ = r;
  61     }
  62     if (buf_size > 0) *q = '\0';
  63 }
  64
  65 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
  66 {
  67     get_strl(pb, buf, buf_size, get_byte(pb));
  68 }
  69
  70 static void rm_read_metadata(AVFormatContext *s, int wide)
  71 {
  72     char buf[1024];
  73     int i;
  74     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
  75         int len = wide ? get_be16(s->pb) : get_byte(s->pb);
  76         get_strl(s->pb, buf, sizeof(buf), len);
  77         av_metadata_set(&s->metadata, ff_rm_metadata[i], buf);
  78     }
  79 }
  80
  81 RMStream *ff_rm_alloc_rmstream (void)
  82 {
  83     RMStream *rms = av_mallocz(sizeof(RMStream));
  84     rms->curpic_num = -1;
  85     return rms;
  86 }
  87
  88 void ff_rm_free_rmstream (RMStream *rms)
  89 {
  90     av_free_packet(&rms->pkt);
  91 }
  92
  93 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
  94                                      AVStream *st, RMStream *ast, int read_all)
  95 {
  96     char buf[256];
  97     uint32_t version;
  98
  99     /* ra type header */
 100     version = get_be32(pb); /* version */
 101     if (((version >> 16) & 0xff) == 3) {
 102         int64_t startpos = url_ftell(pb);
 103         url_fskip(pb, 14);
 104         rm_read_metadata(s, 0);
 105         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
 106             // fourcc (should always be "lpcJ")
 107             get_byte(pb);
 108             get_str8(pb, buf, sizeof(buf));
 109         }
 110         // Skip extra header crap (this should never happen)
 111         if ((startpos + (version & 0xffff)) > url_ftell(pb))
 112             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
 113         st->codec->sample_rate = 8000;
 114         st->codec->channels = 1;
 115         st->codec->codec_type = CODEC_TYPE_AUDIO;
 116         st->codec->codec_id = CODEC_ID_RA_144;
 117     } else {
 118         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
 119         /* old version (4) */
 120         get_be32(pb); /* .ra4 */
 121         get_be32(pb); /* data size */
 122         get_be16(pb); /* version2 */
 123         get_be32(pb); /* header size */
 124         flavor= get_be16(pb); /* add codec info / flavor */
 125         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
 126         get_be32(pb); /* ??? */
 127         get_be32(pb); /* ??? */
 128         get_be32(pb); /* ??? */
 129         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
 130         st->codec->block_align= get_be16(pb); /* frame size */
 131         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
 132         get_be16(pb); /* ??? */
 133         if (((version >> 16) & 0xff) == 5) {
 134             get_be16(pb); get_be16(pb); get_be16(pb);
 135         }
 136         st->codec->sample_rate = get_be16(pb);
 137         get_be32(pb);
 138         st->codec->channels = get_be16(pb);
 139         if (((version >> 16) & 0xff) == 5) {
 140             get_be32(pb);
 141             get_buffer(pb, buf, 4);
 142             buf[4] = 0;
 143         } else {
 144             get_str8(pb, buf, sizeof(buf)); /* desc */
 145             get_str8(pb, buf, sizeof(buf)); /* desc */
 146         }
 147         st->codec->codec_type = CODEC_TYPE_AUDIO;
 148         if (!strcmp(buf, "dnet")) {
 149             st->codec->codec_id = CODEC_ID_AC3;
 150             st->need_parsing = AVSTREAM_PARSE_FULL;
 151         } else if (!strcmp(buf, "28_8")) {
 152             st->codec->codec_id = CODEC_ID_RA_288;
 153             st->codec->extradata_size= 0;
 154             ast->audio_framesize = st->codec->block_align;
 155             st->codec->block_align = coded_framesize;
 156
 157             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 158                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
 159                 return -1;
 160             }
 161
 162             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 163         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
 164             int codecdata_length;
 165             get_be16(pb); get_byte(pb);
 166             if (((version >> 16) & 0xff) == 5)
 167                 get_byte(pb);
 168             codecdata_length = get_be32(pb);
 169             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 170                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 171                 return -1;
 172             }
 173
 174             if(sub_packet_size <= 0){
 175                 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
 176                 return -1;
 177             }
 178
 179             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
 180             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
 181             else st->codec->codec_id = CODEC_ID_ATRAC3;
 182             st->codec->extradata_size= codecdata_length;
 183             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 184             get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 185             ast->audio_framesize = st->codec->block_align;
 186             st->codec->block_align = ast->sub_packet_size;
 187
 188             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 189                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 190                 return -1;
 191             }
 192
 193             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 194         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
 195             int codecdata_length;
 196             get_be16(pb); get_byte(pb);
 197             if (((version >> 16) & 0xff) == 5)
 198                 get_byte(pb);
 199             st->codec->codec_id = CODEC_ID_AAC;
 200             codecdata_length = get_be32(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             if (codecdata_length >= 1) {
 206                 st->codec->extradata_size = codecdata_length - 1;
 207                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 208                 get_byte(pb);
 209                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 210             }
 211         } else {
 212             st->codec->codec_id = CODEC_ID_NONE;
 213             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
 214         }
 215         if (read_all) {
 216             get_byte(pb);
 217             get_byte(pb);
 218             get_byte(pb);
 219             rm_read_metadata(s, 0);
 220         }
 221     }
 222     return 0;
 223 }
 224
 225 int
 226 ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
 227                            AVStream *st, RMStream *rst, int codec_data_size)
 228 {
 229     unsigned int v;
 230     int size;
 231     int64_t codec_pos;
 232
 233     av_set_pts_info(st, 64, 1, 1000);
 234     codec_pos = url_ftell(pb);
 235     v = get_be32(pb);
 236     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
 237         /* ra type header */
 238         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
 239             return -1;
 240     } else {
 241         int fps, fps2;
 242         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
 243         fail1:
 244             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
 245             goto skip;
 246         }
 247         st->codec->codec_tag = get_le32(pb);
 248 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
 249         if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
 250             && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
 251             && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
 252             && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')
 253             && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))
 254             goto fail1;
 255         st->codec->width = get_be16(pb);
 256         st->codec->height = get_be16(pb);
 257         st->codec->time_base.num= 1;
 258         fps= get_be16(pb);
 259         st->codec->codec_type = CODEC_TYPE_VIDEO;
 260         get_be32(pb);
 261         fps2= get_be16(pb);
 262         get_be16(pb);
 263
 264         st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
 265
 266         if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
 267             //check is redundant as get_buffer() will catch this
 268             av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
 269             return -1;
 270         }
 271         st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 272         if (!st->codec->extradata)
 273             return AVERROR(ENOMEM);
 274         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 275
 276 //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
 277         st->codec->time_base.den = fps * st->codec->time_base.num;
 278         switch(((uint8_t*)st->codec->extradata)[4]>>4){
 279         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
 280         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
 281         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
 282         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
 283         default: goto fail1;
 284         }
 285     }
 286
 287 skip:
 288     /* skip codec info */
 289     size = url_ftell(pb) - codec_pos;
 290     url_fskip(pb, codec_data_size - size);
 291
 292     return 0;
 293 }
 294
 295 /** this function assumes that the demuxer has already seeked to the start
 296  * of the INDX chunk, and will bail out if not. */
 297 static int rm_read_index(AVFormatContext *s)
 298 {
 299     ByteIOContext *pb = s->pb;
 300     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
 301     AVStream *st;
 302
 303     do {
 304         if (get_le32(pb) != MKTAG('I','N','D','X'))
 305             return -1;
 306         size     = get_be32(pb);
 307         if (size < 20)
 308             return -1;
 309         url_fskip(pb, 2);
 310         n_pkts   = get_be32(pb);
 311         str_id   = get_be16(pb);
 312         next_off = get_be32(pb);
 313         for (n = 0; n < s->nb_streams; n++)
 314             if (s->streams[n]->id == str_id) {
 315                 st = s->streams[n];
 316                 break;
 317             }
 318         if (n == s->nb_streams)
 319             goto skip;
 320
 321         for (n = 0; n < n_pkts; n++) {
 322             url_fskip(pb, 2);
 323             pts = get_be32(pb);
 324             pos = get_be32(pb);
 325             url_fskip(pb, 4); /* packet no. */
 326
 327             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
 328         }
 329
 330 skip:
 331         if (next_off && url_ftell(pb) != next_off &&
 332             url_fseek(pb, next_off, SEEK_SET) < 0)
 333             return -1;
 334     } while (next_off);
 335
 336     return 0;
 337 }
 338
 339 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 340 {
 341     RMDemuxContext *rm = s->priv_data;
 342     AVStream *st;
 343
 344     rm->old_format = 1;
 345     st = av_new_stream(s, 0);
 346     if (!st)
 347         return -1;
 348     st->priv_data = ff_rm_alloc_rmstream();
 349     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
 350 }
 351
 352 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 353 {
 354     RMDemuxContext *rm = s->priv_data;
 355     AVStream *st;
 356     ByteIOContext *pb = s->pb;
 357     unsigned int tag;
 358     int tag_size;
 359     unsigned int start_time, duration;
 360     unsigned int data_off = 0, indx_off = 0;
 361     char buf[128];
 362     int flags = 0;
 363
 364     tag = get_le32(pb);
 365     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 366         /* very old .ra format */
 367         return rm_read_header_old(s, ap);
 368     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 369         return AVERROR(EIO);
 370     }
 371
 372     get_be32(pb); /* header size */
 373     get_be16(pb);
 374     get_be32(pb);
 375     get_be32(pb); /* number of headers */
 376
 377     for(;;) {
 378         if (url_feof(pb))
 379             return -1;
 380         tag = get_le32(pb);
 381         tag_size = get_be32(pb);
 382         get_be16(pb);
 383 #if 0
 384         printf("tag=%c%c%c%c (%08x) size=%d\n",
 385                (tag) & 0xff,
 386                (tag >> 8) & 0xff,
 387                (tag >> 16) & 0xff,
 388                (tag >> 24) & 0xff,
 389                tag,
 390                tag_size);
 391 #endif
 392         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 393             return -1;
 394         switch(tag) {
 395         case MKTAG('P', 'R', 'O', 'P'):
 396             /* file header */
 397             get_be32(pb); /* max bit rate */
 398             get_be32(pb); /* avg bit rate */
 399             get_be32(pb); /* max packet size */
 400             get_be32(pb); /* avg packet size */
 401             get_be32(pb); /* nb packets */
 402             get_be32(pb); /* duration */
 403             get_be32(pb); /* preroll */
 404             indx_off = get_be32(pb); /* index offset */
 405             data_off = get_be32(pb); /* data offset */
 406             get_be16(pb); /* nb streams */
 407             flags = get_be16(pb); /* flags */
 408             break;
 409         case MKTAG('C', 'O', 'N', 'T'):
 410             rm_read_metadata(s, 1);
 411             break;
 412         case MKTAG('M', 'D', 'P', 'R'):
 413             st = av_new_stream(s, 0);
 414             if (!st)
 415                 return AVERROR(ENOMEM);
 416             st->id = get_be16(pb);
 417             get_be32(pb); /* max bit rate */
 418             st->codec->bit_rate = get_be32(pb); /* bit rate */
 419             get_be32(pb); /* max packet size */
 420             get_be32(pb); /* avg packet size */
 421             start_time = get_be32(pb); /* start time */
 422             get_be32(pb); /* preroll */
 423             duration = get_be32(pb); /* duration */
 424             st->start_time = start_time;
 425             st->duration = duration;
 426             get_str8(pb, buf, sizeof(buf)); /* desc */
 427             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 428             st->codec->codec_type = CODEC_TYPE_DATA;
 429             st->priv_data = ff_rm_alloc_rmstream();
 430             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
 431                                           get_be32(pb)) < 0)
 432                 return -1;
 433             break;
 434         case MKTAG('D', 'A', 'T', 'A'):
 435             goto header_end;
 436         default:
 437             /* unknown tag: skip it */
 438             url_fskip(pb, tag_size - 10);
 439             break;
 440         }
 441     }
 442  header_end:
 443     rm->nb_packets = get_be32(pb); /* number of packets */
 444     if (!rm->nb_packets && (flags & 4))
 445         rm->nb_packets = 3600 * 25;
 446     get_be32(pb); /* next data header */
 447
 448     if (!data_off)
 449         data_off = url_ftell(pb) - 18;
 450     if (indx_off && url_fseek(pb, indx_off, SEEK_SET) >= 0) {
 451         rm_read_index(s);
 452         url_fseek(pb, data_off + 18, SEEK_SET);
 453     }
 454
 455     return 0;
 456 }
 457
 458 static int get_num(ByteIOContext *pb, int *len)
 459 {
 460     int n, n1;
 461
 462     n = get_be16(pb);
 463     (*len)-=2;
 464     n &= 0x7FFF;
 465     if (n >= 0x4000) {
 466         return n - 0x4000;
 467     } else {
 468         n1 = get_be16(pb);
 469         (*len)-=2;
 470         return (n << 16) | n1;
 471     }
 472 }
 473
 474 /* multiple of 20 bytes for ra144 (ugly) */
 475 #define RAW_PACKET_SIZE 1000
 476
 477 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 478     RMDemuxContext *rm = s->priv_data;
 479     ByteIOContext *pb = s->pb;
 480     int len, num, res, i;
 481     AVStream *st;
 482     uint32_t state=0xFFFFFFFF;
 483
 484     while(!url_feof(pb)){
 485         *pos= url_ftell(pb) - 3;
 486         if(rm->remaining_len > 0){
 487             num= rm->current_stream;
 488             len= rm->remaining_len;
 489             *timestamp = AV_NOPTS_VALUE;
 490             *flags= 0;
 491         }else{
 492             state= (state<<8) + get_byte(pb);
 493
 494             if(state == MKBETAG('I', 'N', 'D', 'X')){
 495                 int n_pkts, expected_len;
 496                 len = get_be32(pb);
 497                 url_fskip(pb, 2);
 498                 n_pkts = get_be32(pb);
 499                 expected_len = 20 + n_pkts * 14;
 500                 if (len == 20)
 501                     /* some files don't add index entries to chunk size... */
 502                     len = expected_len;
 503                 else if (len != expected_len)
 504                     av_log(s, AV_LOG_WARNING,
 505                            "Index size %d (%d pkts) is wrong, should be %d.\n",
 506                            len, n_pkts, expected_len);
 507                 len -= 14; // we already read part of the index header
 508                 if(len<0)
 509                     continue;
 510                 goto skip;
 511             }
 512
 513             if(state > (unsigned)0xFFFF || state < 12)
 514                 continue;
 515             len=state;
 516             state= 0xFFFFFFFF;
 517
 518             num = get_be16(pb);
 519             *timestamp = get_be32(pb);
 520             res= get_byte(pb); /* reserved */
 521             *flags = get_byte(pb); /* flags */
 522
 523
 524             len -= 12;
 525         }
 526         for(i=0;i<s->nb_streams;i++) {
 527             st = s->streams[i];
 528             if (num == st->id)
 529                 break;
 530         }
 531         if (i == s->nb_streams) {
 532 skip:
 533             /* skip packet if unknown number */
 534             url_fskip(pb, len);
 535             rm->remaining_len = 0;
 536             continue;
 537         }
 538         *stream_index= i;
 539
 540         return len;
 541     }
 542     return -1;
 543 }
 544
 545 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
 546                                    RMDemuxContext *rm, RMStream *vst,
 547                                    AVPacket *pkt, int len, int *pseq)
 548 {
 549     int hdr, seq, pic_num, len2, pos;
 550     int type;
 551
 552     hdr = get_byte(pb); len--;
 553     type = hdr >> 6;
 554
 555     if(type != 3){  // not frame as a part of packet
 556         seq = get_byte(pb); len--;
 557     }
 558     if(type != 1){  // not whole frame
 559         len2 = get_num(pb, &len);
 560         pos  = get_num(pb, &len);
 561         pic_num = get_byte(pb); len--;
 562     }
 563     if(len<0)
 564         return -1;
 565     rm->remaining_len = len;
 566     if(type&1){     // frame, not slice
 567         if(type == 3)  // frame as a part of packet
 568             len= len2;
 569         if(rm->remaining_len < len)
 570             return -1;
 571         rm->remaining_len -= len;
 572         if(av_new_packet(pkt, len + 9) < 0)
 573             return AVERROR(EIO);
 574         pkt->data[0] = 0;
 575         AV_WL32(pkt->data + 1, 1);
 576         AV_WL32(pkt->data + 5, 0);
 577         get_buffer(pb, pkt->data + 9, len);
 578         return 0;
 579     }
 580     //now we have to deal with single slice
 581
 582     *pseq = seq;
 583     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
 584         vst->slices = ((hdr & 0x3F) << 1) + 1;
 585         vst->videobufsize = len2 + 8*vst->slices + 1;
 586         av_free_packet(&vst->pkt); //FIXME this should be output.
 587         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
 588             return AVERROR(ENOMEM);
 589         vst->videobufpos = 8*vst->slices + 1;
 590         vst->cur_slice = 0;
 591         vst->curpic_num = pic_num;
 592         vst->pktpos = url_ftell(pb);
 593     }
 594     if(type == 2)
 595         len = FFMIN(len, pos);
 596
 597     if(++vst->cur_slice > vst->slices)
 598         return 1;
 599     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
 600     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
 601     if(vst->videobufpos + len > vst->videobufsize)
 602         return 1;
 603     if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
 604         return AVERROR(EIO);
 605     vst->videobufpos += len;
 606     rm->remaining_len-= len;
 607
 608     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
 609         vst->pkt.data[0] = vst->cur_slice-1;
 610         *pkt= vst->pkt;
 611         vst->pkt.data= NULL;
 612         vst->pkt.size= 0;
 613         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
 614             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
 615                 vst->videobufpos - 1 - 8*vst->slices);
 616         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
 617         pkt->pts = AV_NOPTS_VALUE;
 618         pkt->pos = vst->pktpos;
 619         return 0;
 620     }
 621
 622     return 1;
 623 }
 624
 625 static inline void
 626 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
 627 {
 628     uint8_t *ptr;
 629     int j;
 630
 631     if (st->codec->codec_id == CODEC_ID_AC3) {
 632         ptr = pkt->data;
 633         for (j=0;j<pkt->size;j+=2) {
 634             FFSWAP(int, ptr[0], ptr[1]);
 635             ptr += 2;
 636         }
 637     }
 638 }
 639
 640 int
 641 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
 642                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
 643                     int *seq, int *flags, int64_t *timestamp)
 644 {
 645     RMDemuxContext *rm = s->priv_data;
 646
 647     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 648         rm->current_stream= st->id;
 649         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
 650             return -1; //got partial frame
 651     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 652         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
 653             (st->codec->codec_id == CODEC_ID_COOK) ||
 654             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
 655             (st->codec->codec_id == CODEC_ID_SIPR)) {
 656             int x;
 657             int sps = ast->sub_packet_size;
 658             int cfs = ast->coded_framesize;
 659             int h = ast->sub_packet_h;
 660             int y = ast->sub_packet_cnt;
 661             int w = ast->audio_framesize;
 662
 663             if (*flags & 2)
 664                 y = ast->sub_packet_cnt = 0;
 665             if (!y)
 666                 ast->audiotimestamp = *timestamp;
 667
 668             switch(st->codec->codec_id) {
 669                 case CODEC_ID_RA_288:
 670                     for (x = 0; x < h/2; x++)
 671                         get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
 672                     break;
 673                 case CODEC_ID_ATRAC3:
 674                 case CODEC_ID_COOK:
 675                     for (x = 0; x < w/sps; x++)
 676                         get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 677                     break;
 678             }
 679
 680             if (++(ast->sub_packet_cnt) < h)
 681                 return -1;
 682              ast->sub_packet_cnt = 0;
 683              rm->audio_stream_num = st->index;
 684              rm->audio_pkt_cnt = h * w / st->codec->block_align;
 685         } else if (st->codec->codec_id == CODEC_ID_AAC) {
 686             int x;
 687             rm->audio_stream_num = st->index;
 688             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
 689             if (ast->sub_packet_cnt) {
 690                 for (x = 0; x < ast->sub_packet_cnt; x++)
 691                     ast->sub_packet_lengths[x] = get_be16(pb);
 692                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
 693                 ast->audiotimestamp = *timestamp;
 694             } else
 695                 return -1;
 696         } else {
 697             av_get_packet(pb, pkt, len);
 698             rm_ac3_swap_bytes(st, pkt);
 699         }
 700     } else
 701         av_get_packet(pb, pkt, len);
 702
 703     pkt->stream_index = st->index;
 704
 705 #if 0
 706     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 707         if(st->codec->codec_id == CODEC_ID_RV20){
 708             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 709             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
 710
 711             seq |= (*timestamp&~0x3FFF);
 712             if(seq - *timestamp >  0x2000) seq -= 0x4000;
 713             if(seq - *timestamp < -0x2000) seq += 0x4000;
 714         }
 715     }
 716 #endif
 717
 718     pkt->pts= *timestamp;
 719     if (*flags & 2)
 720         pkt->flags |= PKT_FLAG_KEY;
 721
 722     return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
 723 }
 724
 725 int
 726 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
 727                       AVStream *st, RMStream *ast, AVPacket *pkt)
 728 {
 729     RMDemuxContext *rm = s->priv_data;
 730
 731     assert (rm->audio_pkt_cnt > 0);
 732
 733     if (st->codec->codec_id == CODEC_ID_AAC)
 734         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
 735     else {
 736         av_new_packet(pkt, st->codec->block_align);
 737         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
 738                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 739                st->codec->block_align);
 740     }
 741     rm->audio_pkt_cnt--;
 742     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
 743         ast->audiotimestamp = AV_NOPTS_VALUE;
 744         pkt->flags = PKT_FLAG_KEY;
 745     } else
 746         pkt->flags = 0;
 747     pkt->stream_index = st->index;
 748
 749     return rm->audio_pkt_cnt;
 750 }
 751
 752 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 753 {
 754     RMDemuxContext *rm = s->priv_data;
 755     AVStream *st;
 756     int i, len, res, seq = 1;
 757     int64_t timestamp, pos;
 758     int old_flags, flags;
 759
 760     for (;;) {
 761         if (rm->audio_pkt_cnt) {
 762             // If there are queued audio packet return them first
 763             st = s->streams[rm->audio_stream_num];
 764             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
 765         } else {
 766             if (rm->old_format) {
 767                 RMStream *ast;
 768
 769                 st = s->streams[0];
 770                 ast = st->priv_data;
 771                 timestamp = AV_NOPTS_VALUE;
 772                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
 773                     ast->coded_framesize * ast->sub_packet_h / 2;
 774                 flags = (seq++ == 1) ? 2 : 0;
 775             } else {
 776                 len=sync(s, &timestamp, &flags, &i, &pos);
 777                 if (len > 0)
 778                     st = s->streams[i];
 779             }
 780
 781             if(len<0 || url_feof(s->pb))
 782                 return AVERROR(EIO);
 783
 784             old_flags = flags;
 785             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
 786                                       &seq, &flags, &timestamp);
 787             if((old_flags&2) && (seq&0x7F) == 1)
 788                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 789             if (res)
 790                 continue;
 791         }
 792
 793         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
 794            || st->discard >= AVDISCARD_ALL){
 795             av_free_packet(pkt);
 796         } else
 797             break;
 798     }
 799
 800     return 0;
 801 }
 802
 803 static int rm_read_close(AVFormatContext *s)
 804 {
 805     int i;
 806
 807     for (i=0;i<s->nb_streams;i++)
 808         ff_rm_free_rmstream(s->streams[i]->priv_data);
 809
 810     return 0;
 811 }
 812
 813 static int rm_probe(AVProbeData *p)
 814 {
 815     /* check file header */
 816     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 817          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 818          p->buf[4] == 0 && p->buf[5] == 0) ||
 819         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 820          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 821         return AVPROBE_SCORE_MAX;
 822     else
 823         return 0;
 824 }
 825
 826 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 827                                int64_t *ppos, int64_t pos_limit)
 828 {
 829     RMDemuxContext *rm = s->priv_data;
 830     int64_t pos, dts;
 831     int stream_index2, flags, len, h;
 832
 833     pos = *ppos;
 834
 835     if(rm->old_format)
 836         return AV_NOPTS_VALUE;
 837
 838     url_fseek(s->pb, pos, SEEK_SET);
 839     rm->remaining_len=0;
 840     for(;;){
 841         int seq=1;
 842         AVStream *st;
 843
 844         len=sync(s, &dts, &flags, &stream_index2, &pos);
 845         if(len<0)
 846             return AV_NOPTS_VALUE;
 847
 848         st = s->streams[stream_index2];
 849         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 850             h= get_byte(s->pb); len--;
 851             if(!(h & 0x40)){
 852                 seq = get_byte(s->pb); len--;
 853             }
 854         }
 855
 856         if((flags&2) && (seq&0x7F) == 1){
 857 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
 858             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 859             if(stream_index2 == stream_index)
 860                 break;
 861         }
 862
 863         url_fskip(s->pb, len);
 864     }
 865     *ppos = pos;
 866     return dts;
 867 }
 868
 869 AVInputFormat rm_demuxer = {
 870     "rm",
 871     NULL_IF_CONFIG_SMALL("RealMedia format"),
 872     sizeof(RMDemuxContext),
 873     rm_probe,
 874     rm_read_header,
 875     rm_read_packet,
 876     rm_read_close,
 877     NULL,
 878     rm_read_dts,
 879 };
 880
 881 AVInputFormat rdt_demuxer = {
 882     "rdt",
 883     NULL_IF_CONFIG_SMALL("RDT demuxer"),
 884     sizeof(RMDemuxContext),
 885     NULL,
 886     NULL,
 887     NULL,
 888     rm_read_close,
 889 };