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     uint8_t *videobuf; ///< place to store merged video frame
  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     uint8_t *audiobuf; ///< place to store reordered audio data
  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_freep(&rms->videobuf);
  85     av_freep(&rms->audiobuf);
  86 }
  87
  88 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
  89                                      AVStream *st, RMStream *ast, int read_all)
  90 {
  91     char buf[256];
  92     uint32_t version;
  93
  94     /* ra type header */
  95     version = get_be32(pb); /* version */
  96     if (((version >> 16) & 0xff) == 3) {
  97         int64_t startpos = url_ftell(pb);
  98         url_fskip(pb, 14);
  99         get_str8(pb, s->title, sizeof(s->title));
 100         get_str8(pb, s->author, sizeof(s->author));
 101         get_str8(pb, s->copyright, sizeof(s->copyright));
 102         get_str8(pb, s->comment, sizeof(s->comment));
 103         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
 104             // fourcc (should always be "lpcJ")
 105             get_byte(pb);
 106             get_str8(pb, buf, sizeof(buf));
 107         }
 108         // Skip extra header crap (this should never happen)
 109         if ((startpos + (version & 0xffff)) > url_ftell(pb))
 110             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
 111         st->codec->sample_rate = 8000;
 112         st->codec->channels = 1;
 113         st->codec->codec_type = CODEC_TYPE_AUDIO;
 114         st->codec->codec_id = CODEC_ID_RA_144;
 115     } else {
 116         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
 117         /* old version (4) */
 118         get_be32(pb); /* .ra4 */
 119         get_be32(pb); /* data size */
 120         get_be16(pb); /* version2 */
 121         get_be32(pb); /* header size */
 122         flavor= get_be16(pb); /* add codec info / flavor */
 123         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
 124         get_be32(pb); /* ??? */
 125         get_be32(pb); /* ??? */
 126         get_be32(pb); /* ??? */
 127         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
 128         st->codec->block_align= get_be16(pb); /* frame size */
 129         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
 130         get_be16(pb); /* ??? */
 131         if (((version >> 16) & 0xff) == 5) {
 132             get_be16(pb); get_be16(pb); get_be16(pb);
 133         }
 134         st->codec->sample_rate = get_be16(pb);
 135         get_be32(pb);
 136         st->codec->channels = get_be16(pb);
 137         if (((version >> 16) & 0xff) == 5) {
 138             get_be32(pb);
 139             get_buffer(pb, buf, 4);
 140             buf[4] = 0;
 141         } else {
 142             get_str8(pb, buf, sizeof(buf)); /* desc */
 143             get_str8(pb, buf, sizeof(buf)); /* desc */
 144         }
 145         st->codec->codec_type = CODEC_TYPE_AUDIO;
 146         if (!strcmp(buf, "dnet")) {
 147             st->codec->codec_id = CODEC_ID_AC3;
 148             st->need_parsing = AVSTREAM_PARSE_FULL;
 149         } else if (!strcmp(buf, "28_8")) {
 150             st->codec->codec_id = CODEC_ID_RA_288;
 151             st->codec->extradata_size= 0;
 152             ast->audio_framesize = st->codec->block_align;
 153             st->codec->block_align = coded_framesize;
 154
 155             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 156                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
 157                 return -1;
 158             }
 159
 160             ast->audiobuf = av_malloc(ast->audio_framesize * sub_packet_h);
 161         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
 162             int codecdata_length;
 163             get_be16(pb); get_byte(pb);
 164             if (((version >> 16) & 0xff) == 5)
 165                 get_byte(pb);
 166             codecdata_length = get_be32(pb);
 167             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 168                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 169                 return -1;
 170             }
 171
 172             if(sub_packet_size <= 0){
 173                 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
 174                 return -1;
 175             }
 176
 177             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
 178             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
 179             else st->codec->codec_id = CODEC_ID_ATRAC3;
 180             st->codec->extradata_size= codecdata_length;
 181             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 182             get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 183             ast->audio_framesize = st->codec->block_align;
 184             st->codec->block_align = ast->sub_packet_size;
 185
 186             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 187                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 188                 return -1;
 189             }
 190
 191             ast->audiobuf = av_malloc(ast->audio_framesize * sub_packet_h);
 192         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
 193             int codecdata_length;
 194             get_be16(pb); get_byte(pb);
 195             if (((version >> 16) & 0xff) == 5)
 196                 get_byte(pb);
 197             st->codec->codec_id = CODEC_ID_AAC;
 198             codecdata_length = get_be32(pb);
 199             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 200                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 201                 return -1;
 202             }
 203             if (codecdata_length >= 1) {
 204                 st->codec->extradata_size = codecdata_length - 1;
 205                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 206                 get_byte(pb);
 207                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 208             }
 209         } else {
 210             st->codec->codec_id = CODEC_ID_NONE;
 211             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
 212         }
 213         if (read_all) {
 214             get_byte(pb);
 215             get_byte(pb);
 216             get_byte(pb);
 217
 218             get_str8(pb, s->title, sizeof(s->title));
 219             get_str8(pb, s->author, sizeof(s->author));
 220             get_str8(pb, s->copyright, sizeof(s->copyright));
 221             get_str8(pb, s->comment, sizeof(s->comment));
 222         }
 223     }
 224     return 0;
 225 }
 226
 227 int
 228 ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
 229                            AVStream *st, RMStream *rst, int codec_data_size)
 230 {
 231     unsigned int v;
 232     int size;
 233     int64_t codec_pos;
 234
 235     av_set_pts_info(st, 64, 1, 1000);
 236     codec_pos = url_ftell(pb);
 237     v = get_be32(pb);
 238     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
 239         /* ra type header */
 240         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
 241             return -1;
 242     } else {
 243         int fps, fps2;
 244         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
 245         fail1:
 246             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
 247             goto skip;
 248         }
 249         st->codec->codec_tag = get_le32(pb);
 250 //        av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
 251         if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
 252             && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
 253             && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
 254             && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')
 255             && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))
 256             goto fail1;
 257         st->codec->width = get_be16(pb);
 258         st->codec->height = get_be16(pb);
 259         st->codec->time_base.num= 1;
 260         fps= get_be16(pb);
 261         st->codec->codec_type = CODEC_TYPE_VIDEO;
 262         get_be32(pb);
 263         fps2= get_be16(pb);
 264         get_be16(pb);
 265
 266         st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
 267
 268         if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
 269             //check is redundant as get_buffer() will catch this
 270             av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
 271             return -1;
 272         }
 273         st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 274         if (!st->codec->extradata)
 275             return AVERROR(ENOMEM);
 276         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 277
 278 //        av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
 279         st->codec->time_base.den = fps * st->codec->time_base.num;
 280         switch(((uint8_t*)st->codec->extradata)[4]>>4){
 281         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
 282         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
 283         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
 284         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
 285         default: goto fail1;
 286         }
 287     }
 288
 289 skip:
 290     /* skip codec info */
 291     size = url_ftell(pb) - codec_pos;
 292     url_fskip(pb, codec_data_size - size);
 293
 294     return 0;
 295 }
 296
 297
 298 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 299 {
 300     RMDemuxContext *rm = s->priv_data;
 301     AVStream *st;
 302
 303     rm->old_format = 1;
 304     st = av_new_stream(s, 0);
 305     if (!st)
 306         return -1;
 307     st->priv_data = ff_rm_alloc_rmstream();
 308     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
 309 }
 310
 311 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 312 {
 313     RMDemuxContext *rm = s->priv_data;
 314     AVStream *st;
 315     ByteIOContext *pb = s->pb;
 316     unsigned int tag;
 317     int tag_size;
 318     unsigned int start_time, duration;
 319     char buf[128];
 320     int flags = 0;
 321
 322     tag = get_le32(pb);
 323     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 324         /* very old .ra format */
 325         return rm_read_header_old(s, ap);
 326     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 327         return AVERROR(EIO);
 328     }
 329
 330     get_be32(pb); /* header size */
 331     get_be16(pb);
 332     get_be32(pb);
 333     get_be32(pb); /* number of headers */
 334
 335     for(;;) {
 336         if (url_feof(pb))
 337             return -1;
 338         tag = get_le32(pb);
 339         tag_size = get_be32(pb);
 340         get_be16(pb);
 341 #if 0
 342         printf("tag=%c%c%c%c (%08x) size=%d\n",
 343                (tag) & 0xff,
 344                (tag >> 8) & 0xff,
 345                (tag >> 16) & 0xff,
 346                (tag >> 24) & 0xff,
 347                tag,
 348                tag_size);
 349 #endif
 350         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 351             return -1;
 352         switch(tag) {
 353         case MKTAG('P', 'R', 'O', 'P'):
 354             /* file header */
 355             get_be32(pb); /* max bit rate */
 356             get_be32(pb); /* avg bit rate */
 357             get_be32(pb); /* max packet size */
 358             get_be32(pb); /* avg packet size */
 359             get_be32(pb); /* nb packets */
 360             get_be32(pb); /* duration */
 361             get_be32(pb); /* preroll */
 362             get_be32(pb); /* index offset */
 363             get_be32(pb); /* data offset */
 364             get_be16(pb); /* nb streams */
 365             flags = get_be16(pb); /* flags */
 366             break;
 367         case MKTAG('C', 'O', 'N', 'T'):
 368             get_str16(pb, s->title, sizeof(s->title));
 369             get_str16(pb, s->author, sizeof(s->author));
 370             get_str16(pb, s->copyright, sizeof(s->copyright));
 371             get_str16(pb, s->comment, sizeof(s->comment));
 372             break;
 373         case MKTAG('M', 'D', 'P', 'R'):
 374             st = av_new_stream(s, 0);
 375             if (!st)
 376                 return AVERROR(ENOMEM);
 377             st->id = get_be16(pb);
 378             get_be32(pb); /* max bit rate */
 379             st->codec->bit_rate = get_be32(pb); /* bit rate */
 380             get_be32(pb); /* max packet size */
 381             get_be32(pb); /* avg packet size */
 382             start_time = get_be32(pb); /* start time */
 383             get_be32(pb); /* preroll */
 384             duration = get_be32(pb); /* duration */
 385             st->start_time = start_time;
 386             st->duration = duration;
 387             get_str8(pb, buf, sizeof(buf)); /* desc */
 388             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 389             st->codec->codec_type = CODEC_TYPE_DATA;
 390             st->priv_data = ff_rm_alloc_rmstream();
 391             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
 392                                           get_be32(pb)) < 0)
 393                 return -1;
 394             break;
 395         case MKTAG('D', 'A', 'T', 'A'):
 396             goto header_end;
 397         default:
 398             /* unknown tag: skip it */
 399             url_fskip(pb, tag_size - 10);
 400             break;
 401         }
 402     }
 403  header_end:
 404     rm->nb_packets = get_be32(pb); /* number of packets */
 405     if (!rm->nb_packets && (flags & 4))
 406         rm->nb_packets = 3600 * 25;
 407     get_be32(pb); /* next data header */
 408     return 0;
 409 }
 410
 411 static int get_num(ByteIOContext *pb, int *len)
 412 {
 413     int n, n1;
 414
 415     n = get_be16(pb);
 416     (*len)-=2;
 417     n &= 0x7FFF;
 418     if (n >= 0x4000) {
 419         return n - 0x4000;
 420     } else {
 421         n1 = get_be16(pb);
 422         (*len)-=2;
 423         return (n << 16) | n1;
 424     }
 425 }
 426
 427 /* multiple of 20 bytes for ra144 (ugly) */
 428 #define RAW_PACKET_SIZE 1000
 429
 430 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 431     RMDemuxContext *rm = s->priv_data;
 432     ByteIOContext *pb = s->pb;
 433     int len, num, res, i;
 434     AVStream *st;
 435     uint32_t state=0xFFFFFFFF;
 436
 437     while(!url_feof(pb)){
 438         *pos= url_ftell(pb) - 3;
 439         if(rm->remaining_len > 0){
 440             num= rm->current_stream;
 441             len= rm->remaining_len;
 442             *timestamp = AV_NOPTS_VALUE;
 443             *flags= 0;
 444         }else{
 445             state= (state<<8) + get_byte(pb);
 446
 447             if(state == MKBETAG('I', 'N', 'D', 'X')){
 448                 len = get_be16(pb) - 6;
 449                 if(len<0)
 450                     continue;
 451                 goto skip;
 452             }
 453
 454             if(state > (unsigned)0xFFFF || state < 12)
 455                 continue;
 456             len=state;
 457             state= 0xFFFFFFFF;
 458
 459             num = get_be16(pb);
 460             *timestamp = get_be32(pb);
 461             res= get_byte(pb); /* reserved */
 462             *flags = get_byte(pb); /* flags */
 463
 464
 465             len -= 12;
 466         }
 467         for(i=0;i<s->nb_streams;i++) {
 468             st = s->streams[i];
 469             if (num == st->id)
 470                 break;
 471         }
 472         if (i == s->nb_streams) {
 473 skip:
 474             /* skip packet if unknown number */
 475             url_fskip(pb, len);
 476             rm->remaining_len -= len;
 477             continue;
 478         }
 479         *stream_index= i;
 480
 481         return len;
 482     }
 483     return -1;
 484 }
 485
 486 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
 487                                    RMDemuxContext *rm, RMStream *vst,
 488                                    AVPacket *pkt, int len)
 489 {
 490     int hdr, seq, pic_num, len2, pos;
 491     int type;
 492
 493     hdr = get_byte(pb); len--;
 494     type = hdr >> 6;
 495
 496     if(type != 3){  // not frame as a part of packet
 497         seq = get_byte(pb); len--;
 498     }
 499     if(type != 1){  // not whole frame
 500         len2 = get_num(pb, &len);
 501         pos  = get_num(pb, &len);
 502         pic_num = get_byte(pb); len--;
 503     }
 504     if(len<0)
 505         return -1;
 506     rm->remaining_len = len;
 507     if(type&1){     // frame, not slice
 508         if(type == 3)  // frame as a part of packet
 509             len= len2;
 510         if(rm->remaining_len < len)
 511             return -1;
 512         rm->remaining_len -= len;
 513         if(av_new_packet(pkt, len + 9) < 0)
 514             return AVERROR(EIO);
 515         pkt->data[0] = 0;
 516         AV_WL32(pkt->data + 1, 1);
 517         AV_WL32(pkt->data + 5, 0);
 518         get_buffer(pb, pkt->data + 9, len);
 519         return 0;
 520     }
 521     //now we have to deal with single slice
 522
 523     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
 524         vst->slices = ((hdr & 0x3F) << 1) + 1;
 525         vst->videobufsize = len2 + 8*vst->slices + 1;
 526         av_free(vst->videobuf);
 527         if(!(vst->videobuf = av_malloc(vst->videobufsize)))
 528             return AVERROR(ENOMEM);
 529         vst->videobufpos = 8*vst->slices + 1;
 530         vst->cur_slice = 0;
 531         vst->curpic_num = pic_num;
 532         vst->pktpos = url_ftell(pb);
 533     }
 534     if(type == 2)
 535         len = FFMIN(len, pos);
 536
 537     if(++vst->cur_slice > vst->slices)
 538         return 1;
 539     AV_WL32(vst->videobuf - 7 + 8*vst->cur_slice, 1);
 540     AV_WL32(vst->videobuf - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
 541     if(vst->videobufpos + len > vst->videobufsize)
 542         return 1;
 543     if (get_buffer(pb, vst->videobuf + vst->videobufpos, len) != len)
 544         return AVERROR(EIO);
 545     vst->videobufpos += len;
 546     rm->remaining_len-= len;
 547
 548     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
 549          vst->videobuf[0] = vst->cur_slice-1;
 550          if(av_new_packet(pkt, vst->videobufpos - 8*(vst->slices - vst->cur_slice)) < 0)
 551              return AVERROR(ENOMEM);
 552          memcpy(pkt->data, vst->videobuf, 1 + 8*vst->cur_slice);
 553          memcpy(pkt->data + 1 + 8*vst->cur_slice, vst->videobuf + 1 + 8*vst->slices,
 554                 vst->videobufpos - 1 - 8*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->audiobuf+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->audiobuf+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->audiobuf, st->codec->block_align);
 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->audiobuf + st->codec->block_align *
 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->audiobuf+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->audiobuf, st->codec->block_align);
 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 };