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_str16(ByteIOContext *pb, char *buf, int buf_size)
  66 {
  67     get_strl(pb, buf, buf_size, get_be16(pb));
  68 }
  69
  70 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
  71 {
  72     get_strl(pb, buf, buf_size, get_byte(pb));
  73 }
  74
  75 RMStream *ff_rm_alloc_rmstream (void)
  76 {
  77     RMStream *rms = av_mallocz(sizeof(RMStream));
  78     rms->curpic_num = -1;
  79     return rms;
  80 }
  81
  82 void ff_rm_free_rmstream (RMStream *rms)
  83 {
  84     av_free_packet(&rms->pkt);
  85 }
  86
  87 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
  88                                      AVStream *st, RMStream *ast, int read_all)
  89 {
  90     char buf[256];
  91     uint32_t version;
  92
  93     /* ra type header */
  94     version = get_be32(pb); /* version */
  95     if (((version >> 16) & 0xff) == 3) {
  96         int64_t startpos = url_ftell(pb);
  97         url_fskip(pb, 14);
  98         get_str8(pb, s->title, sizeof(s->title));
  99         get_str8(pb, s->author, sizeof(s->author));
 100         get_str8(pb, s->copyright, sizeof(s->copyright));
 101         get_str8(pb, s->comment, sizeof(s->comment));
 102         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
 103             // fourcc (should always be "lpcJ")
 104             get_byte(pb);
 105             get_str8(pb, buf, sizeof(buf));
 106         }
 107         // Skip extra header crap (this should never happen)
 108         if ((startpos + (version & 0xffff)) > url_ftell(pb))
 109             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
 110         st->codec->sample_rate = 8000;
 111         st->codec->channels = 1;
 112         st->codec->codec_type = CODEC_TYPE_AUDIO;
 113         st->codec->codec_id = CODEC_ID_RA_144;
 114     } else {
 115         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
 116         /* old version (4) */
 117         get_be32(pb); /* .ra4 */
 118         get_be32(pb); /* data size */
 119         get_be16(pb); /* version2 */
 120         get_be32(pb); /* header size */
 121         flavor= get_be16(pb); /* add codec info / flavor */
 122         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
 123         get_be32(pb); /* ??? */
 124         get_be32(pb); /* ??? */
 125         get_be32(pb); /* ??? */
 126         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
 127         st->codec->block_align= get_be16(pb); /* frame size */
 128         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
 129         get_be16(pb); /* ??? */
 130         if (((version >> 16) & 0xff) == 5) {
 131             get_be16(pb); get_be16(pb); get_be16(pb);
 132         }
 133         st->codec->sample_rate = get_be16(pb);
 134         get_be32(pb);
 135         st->codec->channels = get_be16(pb);
 136         if (((version >> 16) & 0xff) == 5) {
 137             get_be32(pb);
 138             get_buffer(pb, buf, 4);
 139             buf[4] = 0;
 140         } else {
 141             get_str8(pb, buf, sizeof(buf)); /* desc */
 142             get_str8(pb, buf, sizeof(buf)); /* desc */
 143         }
 144         st->codec->codec_type = CODEC_TYPE_AUDIO;
 145         if (!strcmp(buf, "dnet")) {
 146             st->codec->codec_id = CODEC_ID_AC3;
 147             st->need_parsing = AVSTREAM_PARSE_FULL;
 148         } else if (!strcmp(buf, "28_8")) {
 149             st->codec->codec_id = CODEC_ID_RA_288;
 150             st->codec->extradata_size= 0;
 151             ast->audio_framesize = st->codec->block_align;
 152             st->codec->block_align = coded_framesize;
 153
 154             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 155                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
 156                 return -1;
 157             }
 158
 159             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 160         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
 161             int codecdata_length;
 162             get_be16(pb); get_byte(pb);
 163             if (((version >> 16) & 0xff) == 5)
 164                 get_byte(pb);
 165             codecdata_length = get_be32(pb);
 166             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 167                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 168                 return -1;
 169             }
 170
 171             if(sub_packet_size <= 0){
 172                 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
 173                 return -1;
 174             }
 175
 176             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
 177             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
 178             else st->codec->codec_id = CODEC_ID_ATRAC3;
 179             st->codec->extradata_size= codecdata_length;
 180             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 181             get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 182             ast->audio_framesize = st->codec->block_align;
 183             st->codec->block_align = ast->sub_packet_size;
 184
 185             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 186                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 187                 return -1;
 188             }
 189
 190             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 191         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
 192             int codecdata_length;
 193             get_be16(pb); get_byte(pb);
 194             if (((version >> 16) & 0xff) == 5)
 195                 get_byte(pb);
 196             st->codec->codec_id = CODEC_ID_AAC;
 197             codecdata_length = get_be32(pb);
 198             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 199                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 200                 return -1;
 201             }
 202             if (codecdata_length >= 1) {
 203                 st->codec->extradata_size = codecdata_length - 1;
 204                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 205                 get_byte(pb);
 206                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 207             }
 208         } else {
 209             st->codec->codec_id = CODEC_ID_NONE;
 210             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
 211         }
 212         if (read_all) {
 213             get_byte(pb);
 214             get_byte(pb);
 215             get_byte(pb);
 216
 217             get_str8(pb, s->title, sizeof(s->title));
 218             get_str8(pb, s->author, sizeof(s->author));
 219             get_str8(pb, s->copyright, sizeof(s->copyright));
 220             get_str8(pb, s->comment, sizeof(s->comment));
 221         }
 222     }
 223     return 0;
 224 }
 225
 226 int
 227 ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
 228                            AVStream *st, RMStream *rst, int codec_data_size)
 229 {
 230     unsigned int v;
 231     int size;
 232     int64_t codec_pos;
 233
 234     av_set_pts_info(st, 64, 1, 1000);
 235     codec_pos = url_ftell(pb);
 236     v = get_be32(pb);
 237     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
 238         /* ra type header */
 239         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
 240             return -1;
 241     } else {
 242         int fps, fps2;
 243         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
 244         fail1:
 245             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
 246             goto skip;
 247         }
 248         st->codec->codec_tag = get_le32(pb);
 249 //        av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
 250         if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
 251             && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
 252             && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
 253             && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')
 254             && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))
 255             goto fail1;
 256         st->codec->width = get_be16(pb);
 257         st->codec->height = get_be16(pb);
 258         st->codec->time_base.num= 1;
 259         fps= get_be16(pb);
 260         st->codec->codec_type = CODEC_TYPE_VIDEO;
 261         get_be32(pb);
 262         fps2= get_be16(pb);
 263         get_be16(pb);
 264
 265         st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
 266
 267         if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
 268             //check is redundant as get_buffer() will catch this
 269             av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
 270             return -1;
 271         }
 272         st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 273         if (!st->codec->extradata)
 274             return AVERROR(ENOMEM);
 275         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 276
 277 //        av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
 278         st->codec->time_base.den = fps * st->codec->time_base.num;
 279         switch(((uint8_t*)st->codec->extradata)[4]>>4){
 280         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
 281         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
 282         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
 283         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
 284         default: goto fail1;
 285         }
 286     }
 287
 288 skip:
 289     /* skip codec info */
 290     size = url_ftell(pb) - codec_pos;
 291     url_fskip(pb, codec_data_size - size);
 292
 293     return 0;
 294 }
 295
 296
 297 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 298 {
 299     RMDemuxContext *rm = s->priv_data;
 300     AVStream *st;
 301
 302     rm->old_format = 1;
 303     st = av_new_stream(s, 0);
 304     if (!st)
 305         return -1;
 306     st->priv_data = ff_rm_alloc_rmstream();
 307     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
 308 }
 309
 310 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 311 {
 312     RMDemuxContext *rm = s->priv_data;
 313     AVStream *st;
 314     ByteIOContext *pb = s->pb;
 315     unsigned int tag;
 316     int tag_size;
 317     unsigned int start_time, duration;
 318     char buf[128];
 319     int flags = 0;
 320
 321     tag = get_le32(pb);
 322     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 323         /* very old .ra format */
 324         return rm_read_header_old(s, ap);
 325     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 326         return AVERROR(EIO);
 327     }
 328
 329     get_be32(pb); /* header size */
 330     get_be16(pb);
 331     get_be32(pb);
 332     get_be32(pb); /* number of headers */
 333
 334     for(;;) {
 335         if (url_feof(pb))
 336             return -1;
 337         tag = get_le32(pb);
 338         tag_size = get_be32(pb);
 339         get_be16(pb);
 340 #if 0
 341         printf("tag=%c%c%c%c (%08x) size=%d\n",
 342                (tag) & 0xff,
 343                (tag >> 8) & 0xff,
 344                (tag >> 16) & 0xff,
 345                (tag >> 24) & 0xff,
 346                tag,
 347                tag_size);
 348 #endif
 349         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 350             return -1;
 351         switch(tag) {
 352         case MKTAG('P', 'R', 'O', 'P'):
 353             /* file header */
 354             get_be32(pb); /* max bit rate */
 355             get_be32(pb); /* avg bit rate */
 356             get_be32(pb); /* max packet size */
 357             get_be32(pb); /* avg packet size */
 358             get_be32(pb); /* nb packets */
 359             get_be32(pb); /* duration */
 360             get_be32(pb); /* preroll */
 361             get_be32(pb); /* index offset */
 362             get_be32(pb); /* data offset */
 363             get_be16(pb); /* nb streams */
 364             flags = get_be16(pb); /* flags */
 365             break;
 366         case MKTAG('C', 'O', 'N', 'T'):
 367             get_str16(pb, s->title, sizeof(s->title));
 368             get_str16(pb, s->author, sizeof(s->author));
 369             get_str16(pb, s->copyright, sizeof(s->copyright));
 370             get_str16(pb, s->comment, sizeof(s->comment));
 371             break;
 372         case MKTAG('M', 'D', 'P', 'R'):
 373             st = av_new_stream(s, 0);
 374             if (!st)
 375                 return AVERROR(ENOMEM);
 376             st->id = get_be16(pb);
 377             get_be32(pb); /* max bit rate */
 378             st->codec->bit_rate = get_be32(pb); /* bit rate */
 379             get_be32(pb); /* max packet size */
 380             get_be32(pb); /* avg packet size */
 381             start_time = get_be32(pb); /* start time */
 382             get_be32(pb); /* preroll */
 383             duration = get_be32(pb); /* duration */
 384             st->start_time = start_time;
 385             st->duration = duration;
 386             get_str8(pb, buf, sizeof(buf)); /* desc */
 387             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 388             st->codec->codec_type = CODEC_TYPE_DATA;
 389             st->priv_data = ff_rm_alloc_rmstream();
 390             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
 391                                           get_be32(pb)) < 0)
 392                 return -1;
 393             break;
 394         case MKTAG('D', 'A', 'T', 'A'):
 395             goto header_end;
 396         default:
 397             /* unknown tag: skip it */
 398             url_fskip(pb, tag_size - 10);
 399             break;
 400         }
 401     }
 402  header_end:
 403     rm->nb_packets = get_be32(pb); /* number of packets */
 404     if (!rm->nb_packets && (flags & 4))
 405         rm->nb_packets = 3600 * 25;
 406     get_be32(pb); /* next data header */
 407     return 0;
 408 }
 409
 410 static int get_num(ByteIOContext *pb, int *len)
 411 {
 412     int n, n1;
 413
 414     n = get_be16(pb);
 415     (*len)-=2;
 416     n &= 0x7FFF;
 417     if (n >= 0x4000) {
 418         return n - 0x4000;
 419     } else {
 420         n1 = get_be16(pb);
 421         (*len)-=2;
 422         return (n << 16) | n1;
 423     }
 424 }
 425
 426 /* multiple of 20 bytes for ra144 (ugly) */
 427 #define RAW_PACKET_SIZE 1000
 428
 429 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 430     RMDemuxContext *rm = s->priv_data;
 431     ByteIOContext *pb = s->pb;
 432     int len, num, res, i;
 433     AVStream *st;
 434     uint32_t state=0xFFFFFFFF;
 435
 436     while(!url_feof(pb)){
 437         *pos= url_ftell(pb) - 3;
 438         if(rm->remaining_len > 0){
 439             num= rm->current_stream;
 440             len= rm->remaining_len;
 441             *timestamp = AV_NOPTS_VALUE;
 442             *flags= 0;
 443         }else{
 444             state= (state<<8) + get_byte(pb);
 445
 446             if(state == MKBETAG('I', 'N', 'D', 'X')){
 447                 len = get_be16(pb) - 6;
 448                 if(len<0)
 449                     continue;
 450                 goto skip;
 451             }
 452
 453             if(state > (unsigned)0xFFFF || state < 12)
 454                 continue;
 455             len=state;
 456             state= 0xFFFFFFFF;
 457
 458             num = get_be16(pb);
 459             *timestamp = get_be32(pb);
 460             res= get_byte(pb); /* reserved */
 461             *flags = get_byte(pb); /* flags */
 462
 463
 464             len -= 12;
 465         }
 466         for(i=0;i<s->nb_streams;i++) {
 467             st = s->streams[i];
 468             if (num == st->id)
 469                 break;
 470         }
 471         if (i == s->nb_streams) {
 472 skip:
 473             /* skip packet if unknown number */
 474             url_fskip(pb, len);
 475             rm->remaining_len -= len;
 476             continue;
 477         }
 478         *stream_index= i;
 479
 480         return len;
 481     }
 482     return -1;
 483 }
 484
 485 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
 486                                    RMDemuxContext *rm, RMStream *vst,
 487                                    AVPacket *pkt, int len)
 488 {
 489     int hdr, seq, pic_num, len2, pos;
 490     int type;
 491
 492     hdr = get_byte(pb); len--;
 493     type = hdr >> 6;
 494
 495     if(type != 3){  // not frame as a part of packet
 496         seq = get_byte(pb); len--;
 497     }
 498     if(type != 1){  // not whole frame
 499         len2 = get_num(pb, &len);
 500         pos  = get_num(pb, &len);
 501         pic_num = get_byte(pb); len--;
 502     }
 503     if(len<0)
 504         return -1;
 505     rm->remaining_len = len;
 506     if(type&1){     // frame, not slice
 507         if(type == 3)  // frame as a part of packet
 508             len= len2;
 509         if(rm->remaining_len < len)
 510             return -1;
 511         rm->remaining_len -= len;
 512         if(av_new_packet(pkt, len + 9) < 0)
 513             return AVERROR(EIO);
 514         pkt->data[0] = 0;
 515         AV_WL32(pkt->data + 1, 1);
 516         AV_WL32(pkt->data + 5, 0);
 517         get_buffer(pb, pkt->data + 9, len);
 518         return 0;
 519     }
 520     //now we have to deal with single slice
 521
 522     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
 523         vst->slices = ((hdr & 0x3F) << 1) + 1;
 524         vst->videobufsize = len2 + 8*vst->slices + 1;
 525         av_free_packet(&vst->pkt); //FIXME this should be output.
 526         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
 527             return AVERROR(ENOMEM);
 528         vst->videobufpos = 8*vst->slices + 1;
 529         vst->cur_slice = 0;
 530         vst->curpic_num = pic_num;
 531         vst->pktpos = url_ftell(pb);
 532     }
 533     if(type == 2)
 534         len = FFMIN(len, pos);
 535
 536     if(++vst->cur_slice > vst->slices)
 537         return 1;
 538     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
 539     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
 540     if(vst->videobufpos + len > vst->videobufsize)
 541         return 1;
 542     if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
 543         return AVERROR(EIO);
 544     vst->videobufpos += len;
 545     rm->remaining_len-= len;
 546
 547     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
 548         vst->pkt.data[0] = vst->cur_slice-1;
 549         *pkt= vst->pkt;
 550         vst->pkt.data= NULL;
 551         vst->pkt.size= 0;
 552         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
 553             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
 554                 vst->videobufpos - 1 - 8*vst->slices);
 555         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
 556         pkt->pts = AV_NOPTS_VALUE;
 557         pkt->pos = vst->pktpos;
 558         return 0;
 559     }
 560
 561     return 1;
 562 }
 563
 564 static inline void
 565 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
 566 {
 567     uint8_t *ptr;
 568     int j;
 569
 570     if (st->codec->codec_id == CODEC_ID_AC3) {
 571         ptr = pkt->data;
 572         for (j=0;j<pkt->size;j+=2) {
 573             FFSWAP(int, ptr[0], ptr[1]);
 574             ptr += 2;
 575         }
 576     }
 577 }
 578
 579 int
 580 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
 581                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
 582                     int *seq, int *flags, int64_t *timestamp)
 583 {
 584     RMDemuxContext *rm = s->priv_data;
 585
 586     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 587         rm->current_stream= st->id;
 588         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len))
 589             return -1; //got partial frame
 590     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 591         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
 592             (st->codec->codec_id == CODEC_ID_COOK) ||
 593             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
 594             (st->codec->codec_id == CODEC_ID_SIPR)) {
 595             int x;
 596             int sps = ast->sub_packet_size;
 597             int cfs = ast->coded_framesize;
 598             int h = ast->sub_packet_h;
 599             int y = ast->sub_packet_cnt;
 600             int w = ast->audio_framesize;
 601
 602             if (*flags & 2)
 603                 y = ast->sub_packet_cnt = 0;
 604             if (!y)
 605                 ast->audiotimestamp = *timestamp;
 606
 607             switch(st->codec->codec_id) {
 608                 case CODEC_ID_RA_288:
 609                     for (x = 0; x < h/2; x++)
 610                         get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
 611                     break;
 612                 case CODEC_ID_ATRAC3:
 613                 case CODEC_ID_COOK:
 614                     for (x = 0; x < w/sps; x++)
 615                         get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 616                     break;
 617             }
 618
 619             if (++(ast->sub_packet_cnt) < h)
 620                 return -1;
 621             else {
 622                 ast->sub_packet_cnt = 0;
 623                 rm->audio_stream_num = st->index;
 624                 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
 625                 // Release first audio packet
 626                 av_new_packet(pkt, st->codec->block_align);
 627                 memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this
 628                 *timestamp = ast->audiotimestamp;
 629                 *flags = 2; // Mark first packet as keyframe
 630             }
 631         } else if (st->codec->codec_id == CODEC_ID_AAC) {
 632             int x;
 633             rm->audio_stream_num = st->index;
 634             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
 635             if (ast->sub_packet_cnt) {
 636                 for (x = 0; x < ast->sub_packet_cnt; x++)
 637                     ast->sub_packet_lengths[x] = get_be16(pb);
 638                 // Release first audio packet
 639                 rm->audio_pkt_cnt = ast->sub_packet_cnt - 1;
 640                 av_get_packet(pb, pkt, ast->sub_packet_lengths[0]);
 641                 *flags = 2; // Mark first packet as keyframe
 642             }
 643         } else {
 644             av_get_packet(pb, pkt, len);
 645             rm_ac3_swap_bytes(st, pkt);
 646         }
 647     } else
 648         av_get_packet(pb, pkt, len);
 649
 650     if(  (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
 651        || st->discard >= AVDISCARD_ALL){
 652         av_free_packet(pkt);
 653         return -1;
 654     }
 655
 656     pkt->stream_index = st->index;
 657
 658 #if 0
 659     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 660         if(st->codec->codec_id == CODEC_ID_RV20){
 661             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 662             av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
 663
 664             seq |= (*timestamp&~0x3FFF);
 665             if(seq - *timestamp >  0x2000) seq -= 0x4000;
 666             if(seq - *timestamp < -0x2000) seq += 0x4000;
 667         }
 668     }
 669 #endif
 670
 671     pkt->pts= *timestamp;
 672     if (*flags & 2)
 673         pkt->flags |= PKT_FLAG_KEY;
 674
 675     return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
 676 }
 677
 678 int
 679 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
 680                       AVStream *st, RMStream *ast, AVPacket *pkt)
 681 {
 682     RMDemuxContext *rm = s->priv_data;
 683
 684     assert (rm->audio_pkt_cnt > 0);
 685
 686     if (st->codec->codec_id == CODEC_ID_AAC)
 687         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
 688     else {
 689         av_new_packet(pkt, st->codec->block_align);
 690         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
 691                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 692                st->codec->block_align);
 693     }
 694     rm->audio_pkt_cnt--;
 695     pkt->flags = 0;
 696     pkt->stream_index = st->index;
 697
 698     return rm->audio_pkt_cnt;
 699 }
 700
 701 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 702 {
 703     RMDemuxContext *rm = s->priv_data;
 704     ByteIOContext *pb = s->pb;
 705     AVStream *st;
 706     int i, len;
 707     int64_t timestamp, pos;
 708     int flags;
 709
 710     if (rm->audio_pkt_cnt) {
 711         // If there are queued audio packet return them first
 712         st = s->streams[rm->audio_stream_num];
 713         ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
 714     } else if (rm->old_format) {
 715         RMStream *ast;
 716
 717         st = s->streams[0];
 718         ast = st->priv_data;
 719         if (st->codec->codec_id == CODEC_ID_RA_288) {
 720             int x, y;
 721
 722             for (y = 0; y < ast->sub_packet_h; y++)
 723                 for (x = 0; x < ast->sub_packet_h/2; x++)
 724                     if (get_buffer(pb, ast->pkt.data+x*2*ast->audio_framesize+y*ast->coded_framesize, ast->coded_framesize) <= 0)
 725                         return AVERROR(EIO);
 726             rm->audio_stream_num = 0;
 727             rm->audio_pkt_cnt = ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - 1;
 728             // Release first audio packet
 729             av_new_packet(pkt, st->codec->block_align);
 730             memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this
 731             pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
 732             pkt->stream_index = 0;
 733         } else {
 734             /* just read raw bytes */
 735             len = RAW_PACKET_SIZE;
 736             len= av_get_packet(pb, pkt, len);
 737             pkt->stream_index = 0;
 738             if (len <= 0) {
 739                 return AVERROR(EIO);
 740             }
 741             pkt->size = len;
 742         }
 743         rm_ac3_swap_bytes(st, pkt);
 744     } else {
 745         int seq=1;
 746 resync:
 747         len=sync(s, &timestamp, &flags, &i, &pos);
 748         if(len<0)
 749             return AVERROR(EIO);
 750         st = s->streams[i];
 751
 752         if (ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
 753                                 &seq, &flags, &timestamp) < 0)
 754             goto resync;
 755
 756         if((flags&2) && (seq&0x7F) == 1)
 757             av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 758     }
 759
 760     return 0;
 761 }
 762
 763 static int rm_read_close(AVFormatContext *s)
 764 {
 765     int i;
 766
 767     for (i=0;i<s->nb_streams;i++)
 768         ff_rm_free_rmstream(s->streams[i]->priv_data);
 769
 770     return 0;
 771 }
 772
 773 static int rm_probe(AVProbeData *p)
 774 {
 775     /* check file header */
 776     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 777          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 778          p->buf[4] == 0 && p->buf[5] == 0) ||
 779         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 780          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 781         return AVPROBE_SCORE_MAX;
 782     else
 783         return 0;
 784 }
 785
 786 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 787                                int64_t *ppos, int64_t pos_limit)
 788 {
 789     RMDemuxContext *rm = s->priv_data;
 790     int64_t pos, dts;
 791     int stream_index2, flags, len, h;
 792
 793     pos = *ppos;
 794
 795     if(rm->old_format)
 796         return AV_NOPTS_VALUE;
 797
 798     url_fseek(s->pb, pos, SEEK_SET);
 799     rm->remaining_len=0;
 800     for(;;){
 801         int seq=1;
 802         AVStream *st;
 803
 804         len=sync(s, &dts, &flags, &stream_index2, &pos);
 805         if(len<0)
 806             return AV_NOPTS_VALUE;
 807
 808         st = s->streams[stream_index2];
 809         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 810             h= get_byte(s->pb); len--;
 811             if(!(h & 0x40)){
 812                 seq = get_byte(s->pb); len--;
 813             }
 814         }
 815
 816         if((flags&2) && (seq&0x7F) == 1){
 817 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
 818             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 819             if(stream_index2 == stream_index)
 820                 break;
 821         }
 822
 823         url_fskip(s->pb, len);
 824     }
 825     *ppos = pos;
 826     return dts;
 827 }
 828
 829 AVInputFormat rm_demuxer = {
 830     "rm",
 831     NULL_IF_CONFIG_SMALL("RM format"),
 832     sizeof(RMDemuxContext),
 833     rm_probe,
 834     rm_read_header,
 835     rm_read_packet,
 836     rm_read_close,
 837     NULL,
 838     rm_read_dts,
 839 };
 840
 841 AVInputFormat rdt_demuxer = {
 842     "rdt",
 843     NULL_IF_CONFIG_SMALL("RDT demuxer"),
 844     sizeof(RMDemuxContext),
 845     NULL, NULL, NULL, rm_read_close, NULL, NULL
 846 };