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 "avformat.h"
  24 #include "rm.h"
  25
  26 struct RMStream {
  27     AVPacket pkt;      ///< place to store merged video frame / reordered audio data
  28     int videobufsize;  ///< current assembled frame size
  29     int videobufpos;   ///< position for the next slice in the video buffer
  30     int curpic_num;    ///< picture number of current frame
  31     int cur_slice, slices;
  32     int64_t pktpos;    ///< first slice position in file
  33     /// Audio descrambling matrix parameters
  34     int64_t audiotimestamp; ///< Audio packet timestamp
  35     int sub_packet_cnt; // Subpacket counter, used while reading
  36     int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
  37     int audio_framesize; /// Audio frame size from container
  38     int sub_packet_lengths[16]; /// Length of each subpacket
  39 };
  40
  41 typedef struct {
  42     int nb_packets;
  43     int old_format;
  44     int current_stream;
  45     int remaining_len;
  46     int audio_stream_num; ///< Stream number for audio packets
  47     int audio_pkt_cnt; ///< Output packet counter
  48 } RMDemuxContext;
  49
  50 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
  51 {
  52     int i;
  53     char *q, r;
  54
  55     q = buf;
  56     for(i=0;i<len;i++) {
  57         r = get_byte(pb);
  58         if (i < buf_size - 1)
  59             *q++ = r;
  60     }
  61     if (buf_size > 0) *q = '\0';
  62 }
  63
  64 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  65 {
  66     get_strl(pb, buf, buf_size, get_be16(pb));
  67 }
  68
  69 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
  70 {
  71     get_strl(pb, buf, buf_size, get_byte(pb));
  72 }
  73
  74 RMStream *ff_rm_alloc_rmstream (void)
  75 {
  76     RMStream *rms = av_mallocz(sizeof(RMStream));
  77     rms->curpic_num = -1;
  78     return rms;
  79 }
  80
  81 void ff_rm_free_rmstream (RMStream *rms)
  82 {
  83     av_free_packet(&rms->pkt);
  84 }
  85
  86 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
  87                                      AVStream *st, RMStream *ast, int read_all)
  88 {
  89     char buf[256];
  90     uint32_t version;
  91
  92     /* ra type header */
  93     version = get_be32(pb); /* version */
  94     if (((version >> 16) & 0xff) == 3) {
  95         int64_t startpos = url_ftell(pb);
  96         url_fskip(pb, 14);
  97         get_str8(pb, s->title, sizeof(s->title));
  98         get_str8(pb, s->author, sizeof(s->author));
  99         get_str8(pb, s->copyright, sizeof(s->copyright));
 100         get_str8(pb, s->comment, sizeof(s->comment));
 101         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
 102             // fourcc (should always be "lpcJ")
 103             get_byte(pb);
 104             get_str8(pb, buf, sizeof(buf));
 105         }
 106         // Skip extra header crap (this should never happen)
 107         if ((startpos + (version & 0xffff)) > url_ftell(pb))
 108             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
 109         st->codec->sample_rate = 8000;
 110         st->codec->channels = 1;
 111         st->codec->codec_type = CODEC_TYPE_AUDIO;
 112         st->codec->codec_id = CODEC_ID_RA_144;
 113     } else {
 114         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
 115         /* old version (4) */
 116         get_be32(pb); /* .ra4 */
 117         get_be32(pb); /* data size */
 118         get_be16(pb); /* version2 */
 119         get_be32(pb); /* header size */
 120         flavor= get_be16(pb); /* add codec info / flavor */
 121         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
 122         get_be32(pb); /* ??? */
 123         get_be32(pb); /* ??? */
 124         get_be32(pb); /* ??? */
 125         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
 126         st->codec->block_align= get_be16(pb); /* frame size */
 127         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
 128         get_be16(pb); /* ??? */
 129         if (((version >> 16) & 0xff) == 5) {
 130             get_be16(pb); get_be16(pb); get_be16(pb);
 131         }
 132         st->codec->sample_rate = get_be16(pb);
 133         get_be32(pb);
 134         st->codec->channels = get_be16(pb);
 135         if (((version >> 16) & 0xff) == 5) {
 136             get_be32(pb);
 137             get_buffer(pb, buf, 4);
 138             buf[4] = 0;
 139         } else {
 140             get_str8(pb, buf, sizeof(buf)); /* desc */
 141             get_str8(pb, buf, sizeof(buf)); /* desc */
 142         }
 143         st->codec->codec_type = CODEC_TYPE_AUDIO;
 144         if (!strcmp(buf, "dnet")) {
 145             st->codec->codec_id = CODEC_ID_AC3;
 146             st->need_parsing = AVSTREAM_PARSE_FULL;
 147         } else if (!strcmp(buf, "28_8")) {
 148             st->codec->codec_id = CODEC_ID_RA_288;
 149             st->codec->extradata_size= 0;
 150             ast->audio_framesize = st->codec->block_align;
 151             st->codec->block_align = coded_framesize;
 152
 153             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 154                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
 155                 return -1;
 156             }
 157
 158             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 159         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
 160             int codecdata_length;
 161             get_be16(pb); get_byte(pb);
 162             if (((version >> 16) & 0xff) == 5)
 163                 get_byte(pb);
 164             codecdata_length = get_be32(pb);
 165             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 166                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 167                 return -1;
 168             }
 169
 170             if(sub_packet_size <= 0){
 171                 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
 172                 return -1;
 173             }
 174
 175             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
 176             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
 177             else st->codec->codec_id = CODEC_ID_ATRAC3;
 178             st->codec->extradata_size= codecdata_length;
 179             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 180             get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 181             ast->audio_framesize = st->codec->block_align;
 182             st->codec->block_align = ast->sub_packet_size;
 183
 184             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 185                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 186                 return -1;
 187             }
 188
 189             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 190         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
 191             int codecdata_length;
 192             get_be16(pb); get_byte(pb);
 193             if (((version >> 16) & 0xff) == 5)
 194                 get_byte(pb);
 195             st->codec->codec_id = CODEC_ID_AAC;
 196             codecdata_length = get_be32(pb);
 197             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 198                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 199                 return -1;
 200             }
 201             if (codecdata_length >= 1) {
 202                 st->codec->extradata_size = codecdata_length - 1;
 203                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 204                 get_byte(pb);
 205                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 206             }
 207         } else {
 208             st->codec->codec_id = CODEC_ID_NONE;
 209             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
 210         }
 211         if (read_all) {
 212             get_byte(pb);
 213             get_byte(pb);
 214             get_byte(pb);
 215
 216             get_str8(pb, s->title, sizeof(s->title));
 217             get_str8(pb, s->author, sizeof(s->author));
 218             get_str8(pb, s->copyright, sizeof(s->copyright));
 219             get_str8(pb, s->comment, sizeof(s->comment));
 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(NULL, 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(NULL, 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             get_str16(pb, s->title, sizeof(s->title));
 367             get_str16(pb, s->author, sizeof(s->author));
 368             get_str16(pb, s->copyright, sizeof(s->copyright));
 369             get_str16(pb, s->comment, sizeof(s->comment));
 370             break;
 371         case MKTAG('M', 'D', 'P', 'R'):
 372             st = av_new_stream(s, 0);
 373             if (!st)
 374                 return AVERROR(ENOMEM);
 375             st->id = get_be16(pb);
 376             get_be32(pb); /* max bit rate */
 377             st->codec->bit_rate = get_be32(pb); /* bit rate */
 378             get_be32(pb); /* max packet size */
 379             get_be32(pb); /* avg packet size */
 380             start_time = get_be32(pb); /* start time */
 381             get_be32(pb); /* preroll */
 382             duration = get_be32(pb); /* duration */
 383             st->start_time = start_time;
 384             st->duration = duration;
 385             get_str8(pb, buf, sizeof(buf)); /* desc */
 386             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 387             st->codec->codec_type = CODEC_TYPE_DATA;
 388             st->priv_data = ff_rm_alloc_rmstream();
 389             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
 390                                           get_be32(pb)) < 0)
 391                 return -1;
 392             break;
 393         case MKTAG('D', 'A', 'T', 'A'):
 394             goto header_end;
 395         default:
 396             /* unknown tag: skip it */
 397             url_fskip(pb, tag_size - 10);
 398             break;
 399         }
 400     }
 401  header_end:
 402     rm->nb_packets = get_be32(pb); /* number of packets */
 403     if (!rm->nb_packets && (flags & 4))
 404         rm->nb_packets = 3600 * 25;
 405     get_be32(pb); /* next data header */
 406     return 0;
 407 }
 408
 409 static int get_num(ByteIOContext *pb, int *len)
 410 {
 411     int n, n1;
 412
 413     n = get_be16(pb);
 414     (*len)-=2;
 415     n &= 0x7FFF;
 416     if (n >= 0x4000) {
 417         return n - 0x4000;
 418     } else {
 419         n1 = get_be16(pb);
 420         (*len)-=2;
 421         return (n << 16) | n1;
 422     }
 423 }
 424
 425 /* multiple of 20 bytes for ra144 (ugly) */
 426 #define RAW_PACKET_SIZE 1000
 427
 428 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 429     RMDemuxContext *rm = s->priv_data;
 430     ByteIOContext *pb = s->pb;
 431     int len, num, res, i;
 432     AVStream *st;
 433     uint32_t state=0xFFFFFFFF;
 434
 435     while(!url_feof(pb)){
 436         *pos= url_ftell(pb) - 3;
 437         if(rm->remaining_len > 0){
 438             num= rm->current_stream;
 439             len= rm->remaining_len;
 440             *timestamp = AV_NOPTS_VALUE;
 441             *flags= 0;
 442         }else{
 443             state= (state<<8) + get_byte(pb);
 444
 445             if(state == MKBETAG('I', 'N', 'D', 'X')){
 446                 len = get_be16(pb) - 6;
 447                 if(len<0)
 448                     continue;
 449                 goto skip;
 450             }
 451
 452             if(state > (unsigned)0xFFFF || state < 12)
 453                 continue;
 454             len=state;
 455             state= 0xFFFFFFFF;
 456
 457             num = get_be16(pb);
 458             *timestamp = get_be32(pb);
 459             res= get_byte(pb); /* reserved */
 460             *flags = get_byte(pb); /* flags */
 461
 462
 463             len -= 12;
 464         }
 465         for(i=0;i<s->nb_streams;i++) {
 466             st = s->streams[i];
 467             if (num == st->id)
 468                 break;
 469         }
 470         if (i == s->nb_streams) {
 471 skip:
 472             /* skip packet if unknown number */
 473             url_fskip(pb, len);
 474             rm->remaining_len -= len;
 475             continue;
 476         }
 477         *stream_index= i;
 478
 479         return len;
 480     }
 481     return -1;
 482 }
 483
 484 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
 485                                    RMDemuxContext *rm, RMStream *vst,
 486                                    AVPacket *pkt, int len)
 487 {
 488     int hdr, seq, pic_num, len2, pos;
 489     int type;
 490
 491     hdr = get_byte(pb); len--;
 492     type = hdr >> 6;
 493
 494     if(type != 3){  // not frame as a part of packet
 495         seq = get_byte(pb); len--;
 496     }
 497     if(type != 1){  // not whole frame
 498         len2 = get_num(pb, &len);
 499         pos  = get_num(pb, &len);
 500         pic_num = get_byte(pb); len--;
 501     }
 502     if(len<0)
 503         return -1;
 504     rm->remaining_len = len;
 505     if(type&1){     // frame, not slice
 506         if(type == 3)  // frame as a part of packet
 507             len= len2;
 508         if(rm->remaining_len < len)
 509             return -1;
 510         rm->remaining_len -= len;
 511         if(av_new_packet(pkt, len + 9) < 0)
 512             return AVERROR(EIO);
 513         pkt->data[0] = 0;
 514         AV_WL32(pkt->data + 1, 1);
 515         AV_WL32(pkt->data + 5, 0);
 516         get_buffer(pb, pkt->data + 9, len);
 517         return 0;
 518     }
 519     //now we have to deal with single slice
 520
 521     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
 522         vst->slices = ((hdr & 0x3F) << 1) + 1;
 523         vst->videobufsize = len2 + 8*vst->slices + 1;
 524         av_free_packet(&vst->pkt); //FIXME this should be output.
 525         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
 526             return AVERROR(ENOMEM);
 527         vst->videobufpos = 8*vst->slices + 1;
 528         vst->cur_slice = 0;
 529         vst->curpic_num = pic_num;
 530         vst->pktpos = url_ftell(pb);
 531     }
 532     if(type == 2)
 533         len = FFMIN(len, pos);
 534
 535     if(++vst->cur_slice > vst->slices)
 536         return 1;
 537     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
 538     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
 539     if(vst->videobufpos + len > vst->videobufsize)
 540         return 1;
 541     if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
 542         return AVERROR(EIO);
 543     vst->videobufpos += len;
 544     rm->remaining_len-= len;
 545
 546     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
 547          vst->pkt.data[0] = vst->cur_slice-1;
 548          *pkt= vst->pkt;
 549          vst->pkt.data=
 550          vst->pkt.size= 0;
 551          if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
 552             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
 553                 vst->videobufpos - 1 - 8*vst->slices);
 554          pkt->size += 8*(vst->cur_slice - vst->slices);
 555          pkt->pts = AV_NOPTS_VALUE;
 556          pkt->pos = vst->pktpos;
 557          return 0;
 558     }
 559
 560     return 1;
 561 }
 562
 563 static inline void
 564 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
 565 {
 566     uint8_t *ptr;
 567     int j;
 568
 569     if (st->codec->codec_id == CODEC_ID_AC3) {
 570         ptr = pkt->data;
 571         for (j=0;j<pkt->size;j+=2) {
 572             FFSWAP(int, ptr[0], ptr[1]);
 573             ptr += 2;
 574         }
 575     }
 576 }
 577
 578 int
 579 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
 580                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
 581                     int *seq, int *flags, int64_t *timestamp)
 582 {
 583     RMDemuxContext *rm = s->priv_data;
 584
 585     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 586         rm->current_stream= st->id;
 587         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len))
 588             return -1; //got partial frame
 589     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 590         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
 591             (st->codec->codec_id == CODEC_ID_COOK) ||
 592             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
 593             (st->codec->codec_id == CODEC_ID_SIPR)) {
 594             int x;
 595             int sps = ast->sub_packet_size;
 596             int cfs = ast->coded_framesize;
 597             int h = ast->sub_packet_h;
 598             int y = ast->sub_packet_cnt;
 599             int w = ast->audio_framesize;
 600
 601             if (*flags & 2)
 602                 y = ast->sub_packet_cnt = 0;
 603             if (!y)
 604                 ast->audiotimestamp = *timestamp;
 605
 606             switch(st->codec->codec_id) {
 607                 case CODEC_ID_RA_288:
 608                     for (x = 0; x < h/2; x++)
 609                         get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
 610                     break;
 611                 case CODEC_ID_ATRAC3:
 612                 case CODEC_ID_COOK:
 613                     for (x = 0; x < w/sps; x++)
 614                         get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 615                     break;
 616             }
 617
 618             if (++(ast->sub_packet_cnt) < h)
 619                 return -1;
 620             else {
 621                 ast->sub_packet_cnt = 0;
 622                 rm->audio_stream_num = st->index;
 623                 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
 624                 // Release first audio packet
 625                 av_new_packet(pkt, st->codec->block_align);
 626                 memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this
 627                 *timestamp = ast->audiotimestamp;
 628                 *flags = 2; // Mark first packet as keyframe
 629             }
 630         } else if (st->codec->codec_id == CODEC_ID_AAC) {
 631             int x;
 632             rm->audio_stream_num = st->index;
 633             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
 634             if (ast->sub_packet_cnt) {
 635                 for (x = 0; x < ast->sub_packet_cnt; x++)
 636                     ast->sub_packet_lengths[x] = get_be16(pb);
 637                 // Release first audio packet
 638                 rm->audio_pkt_cnt = ast->sub_packet_cnt - 1;
 639                 av_get_packet(pb, pkt, ast->sub_packet_lengths[0]);
 640                 *flags = 2; // Mark first packet as keyframe
 641             }
 642         } else {
 643             av_get_packet(pb, pkt, len);
 644             rm_ac3_swap_bytes(st, pkt);
 645         }
 646     } else
 647         av_get_packet(pb, pkt, len);
 648
 649     if(  (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
 650        || st->discard >= AVDISCARD_ALL){
 651         av_free_packet(pkt);
 652         return -1;
 653     }
 654
 655     pkt->stream_index = st->index;
 656
 657 #if 0
 658     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 659         if(st->codec->codec_id == CODEC_ID_RV20){
 660             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 661             av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
 662
 663             seq |= (*timestamp&~0x3FFF);
 664             if(seq - *timestamp >  0x2000) seq -= 0x4000;
 665             if(seq - *timestamp < -0x2000) seq += 0x4000;
 666         }
 667     }
 668 #endif
 669
 670     pkt->pts= *timestamp;
 671     if (*flags & 2)
 672         pkt->flags |= PKT_FLAG_KEY;
 673
 674     return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
 675 }
 676
 677 int
 678 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
 679                       AVStream *st, RMStream *ast, AVPacket *pkt)
 680 {
 681     RMDemuxContext *rm = s->priv_data;
 682
 683     assert (rm->audio_pkt_cnt > 0);
 684
 685     if (st->codec->codec_id == CODEC_ID_AAC)
 686         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
 687     else {
 688         av_new_packet(pkt, st->codec->block_align);
 689         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
 690                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 691                st->codec->block_align);
 692     }
 693     rm->audio_pkt_cnt--;
 694     pkt->flags = 0;
 695     pkt->stream_index = st->index;
 696
 697     return rm->audio_pkt_cnt;
 698 }
 699
 700 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 701 {
 702     RMDemuxContext *rm = s->priv_data;
 703     ByteIOContext *pb = s->pb;
 704     AVStream *st;
 705     int i, len;
 706     int64_t timestamp, pos;
 707     int flags;
 708
 709     if (rm->audio_pkt_cnt) {
 710         // If there are queued audio packet return them first
 711         st = s->streams[rm->audio_stream_num];
 712         ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
 713     } else if (rm->old_format) {
 714         RMStream *ast;
 715
 716         st = s->streams[0];
 717         ast = st->priv_data;
 718         if (st->codec->codec_id == CODEC_ID_RA_288) {
 719             int x, y;
 720
 721             for (y = 0; y < ast->sub_packet_h; y++)
 722                 for (x = 0; x < ast->sub_packet_h/2; x++)
 723                     if (get_buffer(pb, ast->pkt.data+x*2*ast->audio_framesize+y*ast->coded_framesize, ast->coded_framesize) <= 0)
 724                         return AVERROR(EIO);
 725             rm->audio_stream_num = 0;
 726             rm->audio_pkt_cnt = ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - 1;
 727             // Release first audio packet
 728             av_new_packet(pkt, st->codec->block_align);
 729             memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this
 730             pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
 731             pkt->stream_index = 0;
 732         } else {
 733             /* just read raw bytes */
 734             len = RAW_PACKET_SIZE;
 735             len= av_get_packet(pb, pkt, len);
 736             pkt->stream_index = 0;
 737             if (len <= 0) {
 738                 return AVERROR(EIO);
 739             }
 740             pkt->size = len;
 741         }
 742         rm_ac3_swap_bytes(st, pkt);
 743     } else {
 744         int seq=1;
 745 resync:
 746         len=sync(s, &timestamp, &flags, &i, &pos);
 747         if(len<0)
 748             return AVERROR(EIO);
 749         st = s->streams[i];
 750
 751         if (ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
 752                                 &seq, &flags, &timestamp) < 0)
 753             goto resync;
 754
 755         if((flags&2) && (seq&0x7F) == 1)
 756             av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 757     }
 758
 759     return 0;
 760 }
 761
 762 static int rm_read_close(AVFormatContext *s)
 763 {
 764     int i;
 765
 766     for (i=0;i<s->nb_streams;i++)
 767         ff_rm_free_rmstream(s->streams[i]->priv_data);
 768
 769     return 0;
 770 }
 771
 772 static int rm_probe(AVProbeData *p)
 773 {
 774     /* check file header */
 775     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 776          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 777          p->buf[4] == 0 && p->buf[5] == 0) ||
 778         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 779          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 780         return AVPROBE_SCORE_MAX;
 781     else
 782         return 0;
 783 }
 784
 785 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 786                                int64_t *ppos, int64_t pos_limit)
 787 {
 788     RMDemuxContext *rm = s->priv_data;
 789     int64_t pos, dts;
 790     int stream_index2, flags, len, h;
 791
 792     pos = *ppos;
 793
 794     if(rm->old_format)
 795         return AV_NOPTS_VALUE;
 796
 797     url_fseek(s->pb, pos, SEEK_SET);
 798     rm->remaining_len=0;
 799     for(;;){
 800         int seq=1;
 801         AVStream *st;
 802
 803         len=sync(s, &dts, &flags, &stream_index2, &pos);
 804         if(len<0)
 805             return AV_NOPTS_VALUE;
 806
 807         st = s->streams[stream_index2];
 808         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 809             h= get_byte(s->pb); len--;
 810             if(!(h & 0x40)){
 811                 seq = get_byte(s->pb); len--;
 812             }
 813         }
 814
 815         if((flags&2) && (seq&0x7F) == 1){
 816 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
 817             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 818             if(stream_index2 == stream_index)
 819                 break;
 820         }
 821
 822         url_fskip(s->pb, len);
 823     }
 824     *ppos = pos;
 825     return dts;
 826 }
 827
 828 AVInputFormat rm_demuxer = {
 829     "rm",
 830     NULL_IF_CONFIG_SMALL("RM format"),
 831     sizeof(RMDemuxContext),
 832     rm_probe,
 833     rm_read_header,
 834     rm_read_packet,
 835     rm_read_close,
 836     NULL,
 837     rm_read_dts,
 838 };
 839
 840 AVInputFormat rdt_demuxer = {
 841     "rdt",
 842     NULL_IF_CONFIG_SMALL("RDT demuxer"),
 843     sizeof(RMDemuxContext),
 844     NULL, NULL, NULL, rm_read_close, NULL, NULL
 845 };