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
 296 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 297 {
 298     RMDemuxContext *rm = s->priv_data;
 299     AVStream *st;
 300
 301     rm->old_format = 1;
 302     st = av_new_stream(s, 0);
 303     if (!st)
 304         return -1;
 305     st->priv_data = ff_rm_alloc_rmstream();
 306     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
 307 }
 308
 309 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 310 {
 311     RMDemuxContext *rm = s->priv_data;
 312     AVStream *st;
 313     ByteIOContext *pb = s->pb;
 314     unsigned int tag;
 315     int tag_size;
 316     unsigned int start_time, duration;
 317     char buf[128];
 318     int flags = 0;
 319
 320     tag = get_le32(pb);
 321     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 322         /* very old .ra format */
 323         return rm_read_header_old(s, ap);
 324     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 325         return AVERROR(EIO);
 326     }
 327
 328     get_be32(pb); /* header size */
 329     get_be16(pb);
 330     get_be32(pb);
 331     get_be32(pb); /* number of headers */
 332
 333     for(;;) {
 334         if (url_feof(pb))
 335             return -1;
 336         tag = get_le32(pb);
 337         tag_size = get_be32(pb);
 338         get_be16(pb);
 339 #if 0
 340         printf("tag=%c%c%c%c (%08x) size=%d\n",
 341                (tag) & 0xff,
 342                (tag >> 8) & 0xff,
 343                (tag >> 16) & 0xff,
 344                (tag >> 24) & 0xff,
 345                tag,
 346                tag_size);
 347 #endif
 348         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 349             return -1;
 350         switch(tag) {
 351         case MKTAG('P', 'R', 'O', 'P'):
 352             /* file header */
 353             get_be32(pb); /* max bit rate */
 354             get_be32(pb); /* avg bit rate */
 355             get_be32(pb); /* max packet size */
 356             get_be32(pb); /* avg packet size */
 357             get_be32(pb); /* nb packets */
 358             get_be32(pb); /* duration */
 359             get_be32(pb); /* preroll */
 360             get_be32(pb); /* index offset */
 361             get_be32(pb); /* data offset */
 362             get_be16(pb); /* nb streams */
 363             flags = get_be16(pb); /* flags */
 364             break;
 365         case MKTAG('C', 'O', 'N', 'T'):
 366             rm_read_metadata(s, 1);
 367             break;
 368         case MKTAG('M', 'D', 'P', 'R'):
 369             st = av_new_stream(s, 0);
 370             if (!st)
 371                 return AVERROR(ENOMEM);
 372             st->id = get_be16(pb);
 373             get_be32(pb); /* max bit rate */
 374             st->codec->bit_rate = get_be32(pb); /* bit rate */
 375             get_be32(pb); /* max packet size */
 376             get_be32(pb); /* avg packet size */
 377             start_time = get_be32(pb); /* start time */
 378             get_be32(pb); /* preroll */
 379             duration = get_be32(pb); /* duration */
 380             st->start_time = start_time;
 381             st->duration = duration;
 382             get_str8(pb, buf, sizeof(buf)); /* desc */
 383             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 384             st->codec->codec_type = CODEC_TYPE_DATA;
 385             st->priv_data = ff_rm_alloc_rmstream();
 386             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
 387                                           get_be32(pb)) < 0)
 388                 return -1;
 389             break;
 390         case MKTAG('D', 'A', 'T', 'A'):
 391             goto header_end;
 392         default:
 393             /* unknown tag: skip it */
 394             url_fskip(pb, tag_size - 10);
 395             break;
 396         }
 397     }
 398  header_end:
 399     rm->nb_packets = get_be32(pb); /* number of packets */
 400     if (!rm->nb_packets && (flags & 4))
 401         rm->nb_packets = 3600 * 25;
 402     get_be32(pb); /* next data header */
 403     return 0;
 404 }
 405
 406 static int get_num(ByteIOContext *pb, int *len)
 407 {
 408     int n, n1;
 409
 410     n = get_be16(pb);
 411     (*len)-=2;
 412     n &= 0x7FFF;
 413     if (n >= 0x4000) {
 414         return n - 0x4000;
 415     } else {
 416         n1 = get_be16(pb);
 417         (*len)-=2;
 418         return (n << 16) | n1;
 419     }
 420 }
 421
 422 /* multiple of 20 bytes for ra144 (ugly) */
 423 #define RAW_PACKET_SIZE 1000
 424
 425 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 426     RMDemuxContext *rm = s->priv_data;
 427     ByteIOContext *pb = s->pb;
 428     int len, num, res, i;
 429     AVStream *st;
 430     uint32_t state=0xFFFFFFFF;
 431
 432     while(!url_feof(pb)){
 433         *pos= url_ftell(pb) - 3;
 434         if(rm->remaining_len > 0){
 435             num= rm->current_stream;
 436             len= rm->remaining_len;
 437             *timestamp = AV_NOPTS_VALUE;
 438             *flags= 0;
 439         }else{
 440             state= (state<<8) + get_byte(pb);
 441
 442             if(state == MKBETAG('I', 'N', 'D', 'X')){
 443                 len = get_be16(pb) - 6;
 444                 if(len<0)
 445                     continue;
 446                 goto skip;
 447             }
 448
 449             if(state > (unsigned)0xFFFF || state < 12)
 450                 continue;
 451             len=state;
 452             state= 0xFFFFFFFF;
 453
 454             num = get_be16(pb);
 455             *timestamp = get_be32(pb);
 456             res= get_byte(pb); /* reserved */
 457             *flags = get_byte(pb); /* flags */
 458
 459
 460             len -= 12;
 461         }
 462         for(i=0;i<s->nb_streams;i++) {
 463             st = s->streams[i];
 464             if (num == st->id)
 465                 break;
 466         }
 467         if (i == s->nb_streams) {
 468 skip:
 469             /* skip packet if unknown number */
 470             url_fskip(pb, len);
 471             rm->remaining_len -= len;
 472             continue;
 473         }
 474         *stream_index= i;
 475
 476         return len;
 477     }
 478     return -1;
 479 }
 480
 481 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
 482                                    RMDemuxContext *rm, RMStream *vst,
 483                                    AVPacket *pkt, int len)
 484 {
 485     int hdr, seq, pic_num, len2, pos;
 486     int type;
 487
 488     hdr = get_byte(pb); len--;
 489     type = hdr >> 6;
 490
 491     if(type != 3){  // not frame as a part of packet
 492         seq = get_byte(pb); len--;
 493     }
 494     if(type != 1){  // not whole frame
 495         len2 = get_num(pb, &len);
 496         pos  = get_num(pb, &len);
 497         pic_num = get_byte(pb); len--;
 498     }
 499     if(len<0)
 500         return -1;
 501     rm->remaining_len = len;
 502     if(type&1){     // frame, not slice
 503         if(type == 3)  // frame as a part of packet
 504             len= len2;
 505         if(rm->remaining_len < len)
 506             return -1;
 507         rm->remaining_len -= len;
 508         if(av_new_packet(pkt, len + 9) < 0)
 509             return AVERROR(EIO);
 510         pkt->data[0] = 0;
 511         AV_WL32(pkt->data + 1, 1);
 512         AV_WL32(pkt->data + 5, 0);
 513         get_buffer(pb, pkt->data + 9, len);
 514         return 0;
 515     }
 516     //now we have to deal with single slice
 517
 518     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
 519         vst->slices = ((hdr & 0x3F) << 1) + 1;
 520         vst->videobufsize = len2 + 8*vst->slices + 1;
 521         av_free_packet(&vst->pkt); //FIXME this should be output.
 522         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
 523             return AVERROR(ENOMEM);
 524         vst->videobufpos = 8*vst->slices + 1;
 525         vst->cur_slice = 0;
 526         vst->curpic_num = pic_num;
 527         vst->pktpos = url_ftell(pb);
 528     }
 529     if(type == 2)
 530         len = FFMIN(len, pos);
 531
 532     if(++vst->cur_slice > vst->slices)
 533         return 1;
 534     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
 535     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
 536     if(vst->videobufpos + len > vst->videobufsize)
 537         return 1;
 538     if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
 539         return AVERROR(EIO);
 540     vst->videobufpos += len;
 541     rm->remaining_len-= len;
 542
 543     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
 544         vst->pkt.data[0] = vst->cur_slice-1;
 545         *pkt= vst->pkt;
 546         vst->pkt.data= NULL;
 547         vst->pkt.size= 0;
 548         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
 549             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
 550                 vst->videobufpos - 1 - 8*vst->slices);
 551         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
 552         pkt->pts = AV_NOPTS_VALUE;
 553         pkt->pos = vst->pktpos;
 554         return 0;
 555     }
 556
 557     return 1;
 558 }
 559
 560 static inline void
 561 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
 562 {
 563     uint8_t *ptr;
 564     int j;
 565
 566     if (st->codec->codec_id == CODEC_ID_AC3) {
 567         ptr = pkt->data;
 568         for (j=0;j<pkt->size;j+=2) {
 569             FFSWAP(int, ptr[0], ptr[1]);
 570             ptr += 2;
 571         }
 572     }
 573 }
 574
 575 int
 576 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
 577                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
 578                     int *seq, int *flags, int64_t *timestamp)
 579 {
 580     RMDemuxContext *rm = s->priv_data;
 581
 582     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 583         rm->current_stream= st->id;
 584         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len))
 585             return -1; //got partial frame
 586     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 587         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
 588             (st->codec->codec_id == CODEC_ID_COOK) ||
 589             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
 590             (st->codec->codec_id == CODEC_ID_SIPR)) {
 591             int x;
 592             int sps = ast->sub_packet_size;
 593             int cfs = ast->coded_framesize;
 594             int h = ast->sub_packet_h;
 595             int y = ast->sub_packet_cnt;
 596             int w = ast->audio_framesize;
 597
 598             if (*flags & 2)
 599                 y = ast->sub_packet_cnt = 0;
 600             if (!y)
 601                 ast->audiotimestamp = *timestamp;
 602
 603             switch(st->codec->codec_id) {
 604                 case CODEC_ID_RA_288:
 605                     for (x = 0; x < h/2; x++)
 606                         get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
 607                     break;
 608                 case CODEC_ID_ATRAC3:
 609                 case CODEC_ID_COOK:
 610                     for (x = 0; x < w/sps; x++)
 611                         get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 612                     break;
 613             }
 614
 615             if (++(ast->sub_packet_cnt) < h)
 616                 return -1;
 617             else {
 618                 ast->sub_packet_cnt = 0;
 619                 rm->audio_stream_num = st->index;
 620                 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
 621                 // Release first audio packet
 622                 av_new_packet(pkt, st->codec->block_align);
 623                 memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this
 624                 *timestamp = ast->audiotimestamp;
 625                 *flags = 2; // Mark first packet as keyframe
 626             }
 627         } else if (st->codec->codec_id == CODEC_ID_AAC) {
 628             int x;
 629             rm->audio_stream_num = st->index;
 630             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
 631             if (ast->sub_packet_cnt) {
 632                 for (x = 0; x < ast->sub_packet_cnt; x++)
 633                     ast->sub_packet_lengths[x] = get_be16(pb);
 634                 // Release first audio packet
 635                 rm->audio_pkt_cnt = ast->sub_packet_cnt - 1;
 636                 av_get_packet(pb, pkt, ast->sub_packet_lengths[0]);
 637                 *flags = 2; // Mark first packet as keyframe
 638             }
 639         } else {
 640             av_get_packet(pb, pkt, len);
 641             rm_ac3_swap_bytes(st, pkt);
 642         }
 643     } else
 644         av_get_packet(pb, pkt, len);
 645
 646     if(  (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
 647        || st->discard >= AVDISCARD_ALL){
 648         av_free_packet(pkt);
 649         return -1;
 650     }
 651
 652     pkt->stream_index = st->index;
 653
 654 #if 0
 655     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 656         if(st->codec->codec_id == CODEC_ID_RV20){
 657             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 658             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
 659
 660             seq |= (*timestamp&~0x3FFF);
 661             if(seq - *timestamp >  0x2000) seq -= 0x4000;
 662             if(seq - *timestamp < -0x2000) seq += 0x4000;
 663         }
 664     }
 665 #endif
 666
 667     pkt->pts= *timestamp;
 668     if (*flags & 2)
 669         pkt->flags |= PKT_FLAG_KEY;
 670
 671     return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
 672 }
 673
 674 int
 675 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
 676                       AVStream *st, RMStream *ast, AVPacket *pkt)
 677 {
 678     RMDemuxContext *rm = s->priv_data;
 679
 680     assert (rm->audio_pkt_cnt > 0);
 681
 682     if (st->codec->codec_id == CODEC_ID_AAC)
 683         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
 684     else {
 685         av_new_packet(pkt, st->codec->block_align);
 686         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
 687                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 688                st->codec->block_align);
 689     }
 690     rm->audio_pkt_cnt--;
 691     pkt->flags = 0;
 692     pkt->stream_index = st->index;
 693
 694     return rm->audio_pkt_cnt;
 695 }
 696
 697 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 698 {
 699     RMDemuxContext *rm = s->priv_data;
 700     ByteIOContext *pb = s->pb;
 701     AVStream *st;
 702     int i, len;
 703     int64_t timestamp, pos;
 704     int flags;
 705
 706     if (rm->audio_pkt_cnt) {
 707         // If there are queued audio packet return them first
 708         st = s->streams[rm->audio_stream_num];
 709         ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
 710     } else if (rm->old_format) {
 711         RMStream *ast;
 712
 713         st = s->streams[0];
 714         ast = st->priv_data;
 715         if (st->codec->codec_id == CODEC_ID_RA_288) {
 716             int x, y;
 717
 718             for (y = 0; y < ast->sub_packet_h; y++)
 719                 for (x = 0; x < ast->sub_packet_h/2; x++)
 720                     if (get_buffer(pb, ast->pkt.data+x*2*ast->audio_framesize+y*ast->coded_framesize, ast->coded_framesize) <= 0)
 721                         return AVERROR(EIO);
 722             rm->audio_stream_num = 0;
 723             rm->audio_pkt_cnt = ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - 1;
 724             // Release first audio packet
 725             av_new_packet(pkt, st->codec->block_align);
 726             memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this
 727             pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
 728             pkt->stream_index = 0;
 729         } else {
 730             /* just read raw bytes */
 731             len = RAW_PACKET_SIZE;
 732             len= av_get_packet(pb, pkt, len);
 733             pkt->stream_index = 0;
 734             if (len <= 0) {
 735                 return AVERROR(EIO);
 736             }
 737             pkt->size = len;
 738         }
 739         rm_ac3_swap_bytes(st, pkt);
 740     } else {
 741         int seq=1;
 742 resync:
 743         len=sync(s, &timestamp, &flags, &i, &pos);
 744         if(len<0)
 745             return AVERROR(EIO);
 746         st = s->streams[i];
 747
 748         if (ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
 749                                 &seq, &flags, &timestamp) < 0)
 750             goto resync;
 751
 752         if((flags&2) && (seq&0x7F) == 1)
 753             av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 754     }
 755
 756     return 0;
 757 }
 758
 759 static int rm_read_close(AVFormatContext *s)
 760 {
 761     int i;
 762
 763     for (i=0;i<s->nb_streams;i++)
 764         ff_rm_free_rmstream(s->streams[i]->priv_data);
 765
 766     return 0;
 767 }
 768
 769 static int rm_probe(AVProbeData *p)
 770 {
 771     /* check file header */
 772     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 773          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 774          p->buf[4] == 0 && p->buf[5] == 0) ||
 775         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 776          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 777         return AVPROBE_SCORE_MAX;
 778     else
 779         return 0;
 780 }
 781
 782 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 783                                int64_t *ppos, int64_t pos_limit)
 784 {
 785     RMDemuxContext *rm = s->priv_data;
 786     int64_t pos, dts;
 787     int stream_index2, flags, len, h;
 788
 789     pos = *ppos;
 790
 791     if(rm->old_format)
 792         return AV_NOPTS_VALUE;
 793
 794     url_fseek(s->pb, pos, SEEK_SET);
 795     rm->remaining_len=0;
 796     for(;;){
 797         int seq=1;
 798         AVStream *st;
 799
 800         len=sync(s, &dts, &flags, &stream_index2, &pos);
 801         if(len<0)
 802             return AV_NOPTS_VALUE;
 803
 804         st = s->streams[stream_index2];
 805         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 806             h= get_byte(s->pb); len--;
 807             if(!(h & 0x40)){
 808                 seq = get_byte(s->pb); len--;
 809             }
 810         }
 811
 812         if((flags&2) && (seq&0x7F) == 1){
 813 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
 814             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 815             if(stream_index2 == stream_index)
 816                 break;
 817         }
 818
 819         url_fskip(s->pb, len);
 820     }
 821     *ppos = pos;
 822     return dts;
 823 }
 824
 825 AVInputFormat rm_demuxer = {
 826     "rm",
 827     NULL_IF_CONFIG_SMALL("RealMedia format"),
 828     sizeof(RMDemuxContext),
 829     rm_probe,
 830     rm_read_header,
 831     rm_read_packet,
 832     rm_read_close,
 833     NULL,
 834     rm_read_dts,
 835 };
 836
 837 AVInputFormat rdt_demuxer = {
 838     "rdt",
 839     NULL_IF_CONFIG_SMALL("RDT demuxer"),
 840     sizeof(RMDemuxContext),
 841     NULL,
 842     NULL,
 843     NULL,
 844     rm_read_close,
 845 };