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 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
  27 {
  28     int i;
  29     char *q, r;
  30
  31     q = buf;
  32     for(i=0;i<len;i++) {
  33         r = get_byte(pb);
  34         if (i < buf_size - 1)
  35             *q++ = r;
  36     }
  37     if (buf_size > 0) *q = '\0';
  38 }
  39
  40 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  41 {
  42     get_strl(pb, buf, buf_size, get_be16(pb));
  43 }
  44
  45 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
  46 {
  47     get_strl(pb, buf, buf_size, get_byte(pb));
  48 }
  49
  50 static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
  51                                       int read_all)
  52 {
  53     RMContext *rm = s->priv_data;
  54     ByteIOContext *pb = s->pb;
  55     char buf[256];
  56     uint32_t version;
  57     int i;
  58
  59     /* ra type header */
  60     version = get_be32(pb); /* version */
  61     if (((version >> 16) & 0xff) == 3) {
  62         int64_t startpos = url_ftell(pb);
  63         /* very old version */
  64         for(i = 0; i < 14; i++)
  65             get_byte(pb);
  66         get_str8(pb, s->title, sizeof(s->title));
  67         get_str8(pb, s->author, sizeof(s->author));
  68         get_str8(pb, s->copyright, sizeof(s->copyright));
  69         get_str8(pb, s->comment, sizeof(s->comment));
  70         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
  71         // fourcc (should always be "lpcJ")
  72         get_byte(pb);
  73         get_str8(pb, buf, sizeof(buf));
  74         }
  75         // Skip extra header crap (this should never happen)
  76         if ((startpos + (version & 0xffff)) > url_ftell(pb))
  77             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
  78         st->codec->sample_rate = 8000;
  79         st->codec->channels = 1;
  80         st->codec->codec_type = CODEC_TYPE_AUDIO;
  81         st->codec->codec_id = CODEC_ID_RA_144;
  82     } else {
  83         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
  84         /* old version (4) */
  85         get_be32(pb); /* .ra4 */
  86         get_be32(pb); /* data size */
  87         get_be16(pb); /* version2 */
  88         get_be32(pb); /* header size */
  89         flavor= get_be16(pb); /* add codec info / flavor */
  90         rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
  91         get_be32(pb); /* ??? */
  92         get_be32(pb); /* ??? */
  93         get_be32(pb); /* ??? */
  94         rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
  95         st->codec->block_align= get_be16(pb); /* frame size */
  96         rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
  97         get_be16(pb); /* ??? */
  98         if (((version >> 16) & 0xff) == 5) {
  99             get_be16(pb); get_be16(pb); get_be16(pb); }
 100         st->codec->sample_rate = get_be16(pb);
 101         get_be32(pb);
 102         st->codec->channels = get_be16(pb);
 103         if (((version >> 16) & 0xff) == 5) {
 104             get_be32(pb);
 105             buf[0] = get_byte(pb);
 106             buf[1] = get_byte(pb);
 107             buf[2] = get_byte(pb);
 108             buf[3] = get_byte(pb);
 109             buf[4] = 0;
 110         } else {
 111             get_str8(pb, buf, sizeof(buf)); /* desc */
 112             get_str8(pb, buf, sizeof(buf)); /* desc */
 113         }
 114         st->codec->codec_type = CODEC_TYPE_AUDIO;
 115         if (!strcmp(buf, "dnet")) {
 116             st->codec->codec_id = CODEC_ID_AC3;
 117             st->need_parsing = AVSTREAM_PARSE_FULL;
 118         } else if (!strcmp(buf, "28_8")) {
 119             st->codec->codec_id = CODEC_ID_RA_288;
 120             st->codec->extradata_size= 0;
 121             rm->audio_framesize = st->codec->block_align;
 122             st->codec->block_align = coded_framesize;
 123
 124             if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
 125                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 126                 return -1;
 127             }
 128
 129             rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
 130         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
 131             int codecdata_length, i;
 132             get_be16(pb); get_byte(pb);
 133             if (((version >> 16) & 0xff) == 5)
 134                 get_byte(pb);
 135             codecdata_length = get_be32(pb);
 136             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 137                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 138                 return -1;
 139             }
 140
 141             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
 142             else st->codec->codec_id = CODEC_ID_ATRAC3;
 143             st->codec->extradata_size= codecdata_length;
 144             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 145             for(i = 0; i < codecdata_length; i++)
 146                 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
 147             rm->audio_framesize = st->codec->block_align;
 148             st->codec->block_align = rm->sub_packet_size;
 149
 150             if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
 151                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 152                 return -1;
 153             }
 154
 155             rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
 156         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
 157             int codecdata_length, i;
 158             get_be16(pb); get_byte(pb);
 159             if (((version >> 16) & 0xff) == 5)
 160                 get_byte(pb);
 161             st->codec->codec_id = CODEC_ID_AAC;
 162             codecdata_length = get_be32(pb);
 163             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 164                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 165                 return -1;
 166             }
 167             if (codecdata_length >= 1) {
 168                 st->codec->extradata_size = codecdata_length - 1;
 169                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 170                 get_byte(pb);
 171                 for(i = 0; i < st->codec->extradata_size; i++)
 172                     ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
 173             }
 174         } else {
 175             st->codec->codec_id = CODEC_ID_NONE;
 176             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
 177         }
 178         if (read_all) {
 179             get_byte(pb);
 180             get_byte(pb);
 181             get_byte(pb);
 182
 183             get_str8(pb, s->title, sizeof(s->title));
 184             get_str8(pb, s->author, sizeof(s->author));
 185             get_str8(pb, s->copyright, sizeof(s->copyright));
 186             get_str8(pb, s->comment, sizeof(s->comment));
 187         }
 188     }
 189     return 0;
 190 }
 191
 192 int
 193 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st)
 194 {
 195     ByteIOContext *pb = s->pb;
 196     unsigned int v;
 197     int codec_data_size, size;
 198     int64_t codec_pos;
 199
 200     codec_data_size = get_be32(pb);
 201     codec_pos = url_ftell(pb);
 202     v = get_be32(pb);
 203     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
 204         /* ra type header */
 205         if (rm_read_audio_stream_info(s, st, 0))
 206             return -1;
 207     } else {
 208         int fps, fps2;
 209         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
 210         fail1:
 211             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
 212             goto skip;
 213         }
 214         st->codec->codec_tag = get_le32(pb);
 215 //        av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
 216         if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
 217             && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
 218             && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
 219             && st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
 220             goto fail1;
 221         st->codec->width = get_be16(pb);
 222         st->codec->height = get_be16(pb);
 223         st->codec->time_base.num= 1;
 224         fps= get_be16(pb);
 225         st->codec->codec_type = CODEC_TYPE_VIDEO;
 226         get_be32(pb);
 227         fps2= get_be16(pb);
 228         get_be16(pb);
 229
 230         st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
 231
 232         if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
 233             //check is redundant as get_buffer() will catch this
 234             av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
 235             return -1;
 236         }
 237         st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 238         if (!st->codec->extradata)
 239             return AVERROR(ENOMEM);
 240         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 241
 242 //        av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
 243         st->codec->time_base.den = fps * st->codec->time_base.num;
 244         switch(((uint8_t*)st->codec->extradata)[4]>>4){
 245         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
 246         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
 247         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
 248         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
 249         default: goto fail1;
 250         }
 251     }
 252
 253 skip:
 254     /* skip codec info */
 255     size = url_ftell(pb) - codec_pos;
 256     url_fskip(pb, codec_data_size - size);
 257
 258     return 0;
 259 }
 260
 261
 262 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 263 {
 264     RMContext *rm = s->priv_data;
 265     AVStream *st;
 266
 267     rm->old_format = 1;
 268     st = av_new_stream(s, 0);
 269     if (!st)
 270         return -1;
 271     return rm_read_audio_stream_info(s, st, 1);
 272 }
 273
 274 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 275 {
 276     RMContext *rm = s->priv_data;
 277     AVStream *st;
 278     ByteIOContext *pb = s->pb;
 279     unsigned int tag;
 280     int tag_size;
 281     unsigned int start_time, duration;
 282     char buf[128];
 283     int flags = 0;
 284
 285     tag = get_le32(pb);
 286     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 287         /* very old .ra format */
 288         return rm_read_header_old(s, ap);
 289     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 290         return AVERROR(EIO);
 291     }
 292
 293     get_be32(pb); /* header size */
 294     get_be16(pb);
 295     get_be32(pb);
 296     get_be32(pb); /* number of headers */
 297
 298     for(;;) {
 299         if (url_feof(pb))
 300             return -1;
 301         tag = get_le32(pb);
 302         tag_size = get_be32(pb);
 303         get_be16(pb);
 304 #if 0
 305         printf("tag=%c%c%c%c (%08x) size=%d\n",
 306                (tag) & 0xff,
 307                (tag >> 8) & 0xff,
 308                (tag >> 16) & 0xff,
 309                (tag >> 24) & 0xff,
 310                tag,
 311                tag_size);
 312 #endif
 313         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 314             return -1;
 315         switch(tag) {
 316         case MKTAG('P', 'R', 'O', 'P'):
 317             /* file header */
 318             get_be32(pb); /* max bit rate */
 319             get_be32(pb); /* avg bit rate */
 320             get_be32(pb); /* max packet size */
 321             get_be32(pb); /* avg packet size */
 322             get_be32(pb); /* nb packets */
 323             get_be32(pb); /* duration */
 324             get_be32(pb); /* preroll */
 325             get_be32(pb); /* index offset */
 326             get_be32(pb); /* data offset */
 327             get_be16(pb); /* nb streams */
 328             flags = get_be16(pb); /* flags */
 329             break;
 330         case MKTAG('C', 'O', 'N', 'T'):
 331             get_str16(pb, s->title, sizeof(s->title));
 332             get_str16(pb, s->author, sizeof(s->author));
 333             get_str16(pb, s->copyright, sizeof(s->copyright));
 334             get_str16(pb, s->comment, sizeof(s->comment));
 335             break;
 336         case MKTAG('M', 'D', 'P', 'R'):
 337             st = av_new_stream(s, 0);
 338             if (!st)
 339                 return AVERROR(ENOMEM);
 340             st->id = get_be16(pb);
 341             get_be32(pb); /* max bit rate */
 342             st->codec->bit_rate = get_be32(pb); /* bit rate */
 343             get_be32(pb); /* max packet size */
 344             get_be32(pb); /* avg packet size */
 345             start_time = get_be32(pb); /* start time */
 346             get_be32(pb); /* preroll */
 347             duration = get_be32(pb); /* duration */
 348             st->start_time = start_time;
 349             st->duration = duration;
 350             get_str8(pb, buf, sizeof(buf)); /* desc */
 351             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 352             st->codec->codec_type = CODEC_TYPE_DATA;
 353             av_set_pts_info(st, 64, 1, 1000);
 354             if (ff_rm_read_mdpr_codecdata(s, st) < 0)
 355                 return -1;
 356             break;
 357         case MKTAG('D', 'A', 'T', 'A'):
 358             goto header_end;
 359         default:
 360             /* unknown tag: skip it */
 361             url_fskip(pb, tag_size - 10);
 362             break;
 363         }
 364     }
 365  header_end:
 366     rm->nb_packets = get_be32(pb); /* number of packets */
 367     if (!rm->nb_packets && (flags & 4))
 368         rm->nb_packets = 3600 * 25;
 369     get_be32(pb); /* next data header */
 370     rm->curpic_num = -1;
 371     return 0;
 372 }
 373
 374 static int get_num(ByteIOContext *pb, int *len)
 375 {
 376     int n, n1;
 377
 378     n = get_be16(pb);
 379     (*len)-=2;
 380     n &= 0x7FFF;
 381     if (n >= 0x4000) {
 382         return n - 0x4000;
 383     } else {
 384         n1 = get_be16(pb);
 385         (*len)-=2;
 386         return (n << 16) | n1;
 387     }
 388 }
 389
 390 /* multiple of 20 bytes for ra144 (ugly) */
 391 #define RAW_PACKET_SIZE 1000
 392
 393 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 394     RMContext *rm = s->priv_data;
 395     ByteIOContext *pb = s->pb;
 396     int len, num, res, i;
 397     AVStream *st;
 398     uint32_t state=0xFFFFFFFF;
 399
 400     while(!url_feof(pb)){
 401         *pos= url_ftell(pb) - 3;
 402         if(rm->remaining_len > 0){
 403             num= rm->current_stream;
 404             len= rm->remaining_len;
 405             *timestamp = AV_NOPTS_VALUE;
 406             *flags= 0;
 407         }else{
 408             state= (state<<8) + get_byte(pb);
 409
 410             if(state == MKBETAG('I', 'N', 'D', 'X')){
 411                 len = get_be16(pb) - 6;
 412                 if(len<0)
 413                     continue;
 414                 goto skip;
 415             }
 416
 417             if(state > (unsigned)0xFFFF || state < 12)
 418                 continue;
 419             len=state;
 420             state= 0xFFFFFFFF;
 421
 422             num = get_be16(pb);
 423             *timestamp = get_be32(pb);
 424             res= get_byte(pb); /* reserved */
 425             *flags = get_byte(pb); /* flags */
 426
 427
 428             len -= 12;
 429         }
 430         for(i=0;i<s->nb_streams;i++) {
 431             st = s->streams[i];
 432             if (num == st->id)
 433                 break;
 434         }
 435         if (i == s->nb_streams) {
 436 skip:
 437             /* skip packet if unknown number */
 438             url_fskip(pb, len);
 439             rm->remaining_len -= len;
 440             continue;
 441         }
 442         *stream_index= i;
 443
 444         return len;
 445     }
 446     return -1;
 447 }
 448
 449 static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *pkt, int len)
 450 {
 451     ByteIOContext *pb = s->pb;
 452     int hdr, seq, pic_num, len2, pos;
 453     int type;
 454
 455     hdr = get_byte(pb); len--;
 456     type = hdr >> 6;
 457     switch(type){
 458     case 0: // slice
 459     case 2: // last slice
 460         seq = get_byte(pb); len--;
 461         len2 = get_num(pb, &len);
 462         pos = get_num(pb, &len);
 463         pic_num = get_byte(pb); len--;
 464         rm->remaining_len = len;
 465         break;
 466     case 1: //whole frame
 467         seq = get_byte(pb); len--;
 468         if(av_new_packet(pkt, len + 9) < 0)
 469             return AVERROR(EIO);
 470         pkt->data[0] = 0;
 471         AV_WL32(pkt->data + 1, 1);
 472         AV_WL32(pkt->data + 5, 0);
 473         get_buffer(pb, pkt->data + 9, len);
 474         rm->remaining_len = 0;
 475         return 0;
 476     case 3: //frame as a part of packet
 477         len2 = get_num(pb, &len);
 478         pos = get_num(pb, &len);
 479         pic_num = get_byte(pb); len--;
 480         rm->remaining_len = len - len2;
 481         if(av_new_packet(pkt, len2 + 9) < 0)
 482             return AVERROR(EIO);
 483         pkt->data[0] = 0;
 484         AV_WL32(pkt->data + 1, 1);
 485         AV_WL32(pkt->data + 5, 0);
 486         get_buffer(pb, pkt->data + 9, len2);
 487         return 0;
 488     }
 489     //now we have to deal with single slice
 490
 491     if((seq & 0x7F) == 1 || rm->curpic_num != pic_num){
 492         rm->slices = ((hdr & 0x3F) << 1) + 1;
 493         rm->videobufsize = len2 + 8*rm->slices + 1;
 494         av_free(rm->videobuf);
 495         if(!(rm->videobuf = av_malloc(rm->videobufsize)))
 496             return AVERROR(ENOMEM);
 497         rm->videobufpos = 8*rm->slices + 1;
 498         rm->cur_slice = 0;
 499         rm->curpic_num = pic_num;
 500         rm->pktpos = url_ftell(pb);
 501     }
 502     if(type == 2)
 503         len = FFMIN(len, pos);
 504
 505     if(++rm->cur_slice > rm->slices)
 506         return 1;
 507     AV_WL32(rm->videobuf - 7 + 8*rm->cur_slice, 1);
 508     AV_WL32(rm->videobuf - 3 + 8*rm->cur_slice, rm->videobufpos - 8*rm->slices - 1);
 509     if(rm->videobufpos + len > rm->videobufsize)
 510         return 1;
 511     if (get_buffer(pb, rm->videobuf + rm->videobufpos, len) != len)
 512         return AVERROR(EIO);
 513     rm->videobufpos += len;
 514     rm->remaining_len-= len;
 515
 516     if(type == 2 || (rm->videobufpos) == rm->videobufsize){
 517          rm->videobuf[0] = rm->cur_slice-1;
 518          if(av_new_packet(pkt, rm->videobufpos - 8*(rm->slices - rm->cur_slice)) < 0)
 519              return AVERROR(ENOMEM);
 520          memcpy(pkt->data, rm->videobuf, 1 + 8*rm->cur_slice);
 521          memcpy(pkt->data + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices,
 522                 rm->videobufpos - 1 - 8*rm->slices);
 523          pkt->pts = AV_NOPTS_VALUE;
 524          pkt->pos = rm->pktpos;
 525          return 0;
 526     }
 527
 528     return 1;
 529 }
 530
 531 static inline void
 532 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
 533 {
 534     uint8_t *ptr;
 535     int j;
 536
 537     if (st->codec->codec_id == CODEC_ID_AC3) {
 538         ptr = pkt->data;
 539         for (j=0;j<pkt->size;j+=2) {
 540             FFSWAP(int, ptr[0], ptr[1]);
 541             ptr += 2;
 542         }
 543     }
 544 }
 545
 546 int
 547 ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt,
 548                     int *seq, int *flags, int64_t *timestamp)
 549 {
 550     ByteIOContext *pb = s->pb;
 551     RMContext *rm = s->priv_data;
 552
 553     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 554         rm->current_stream= st->id;
 555         if(rm_assemble_video_frame(s, rm, pkt, len) == 1)
 556             return -1; //got partial frame
 557     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 558         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
 559             (st->codec->codec_id == CODEC_ID_COOK) ||
 560             (st->codec->codec_id == CODEC_ID_ATRAC3)) {
 561             int x;
 562             int sps = rm->sub_packet_size;
 563             int cfs = rm->coded_framesize;
 564             int h = rm->sub_packet_h;
 565             int y = rm->sub_packet_cnt;
 566             int w = rm->audio_framesize;
 567
 568             if (*flags & 2)
 569                 y = rm->sub_packet_cnt = 0;
 570             if (!y)
 571                 rm->audiotimestamp = *timestamp;
 572
 573             switch(st->codec->codec_id) {
 574                 case CODEC_ID_RA_288:
 575                     for (x = 0; x < h/2; x++)
 576                         get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);
 577                     break;
 578                 case CODEC_ID_ATRAC3:
 579                 case CODEC_ID_COOK:
 580                     for (x = 0; x < w/sps; x++)
 581                         get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 582                     break;
 583             }
 584
 585             if (++(rm->sub_packet_cnt) < h)
 586                 return -1;
 587             else {
 588                 rm->sub_packet_cnt = 0;
 589                 rm->audio_stream_num = st->index;
 590                 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
 591                 // Release first audio packet
 592                 av_new_packet(pkt, st->codec->block_align);
 593                 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
 594                 *timestamp = rm->audiotimestamp;
 595                 *flags = 2; // Mark first packet as keyframe
 596             }
 597         } else if (st->codec->codec_id == CODEC_ID_AAC) {
 598             int x;
 599             rm->audio_stream_num = st->index;
 600             rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
 601             if (rm->sub_packet_cnt) {
 602                 for (x = 0; x < rm->sub_packet_cnt; x++)
 603                     rm->sub_packet_lengths[x] = get_be16(pb);
 604                 // Release first audio packet
 605                 rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;
 606                 av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);
 607                 *flags = 2; // Mark first packet as keyframe
 608             }
 609         } else {
 610             av_get_packet(pb, pkt, len);
 611             rm_ac3_swap_bytes(st, pkt);
 612         }
 613     } else
 614         av_get_packet(pb, pkt, len);
 615
 616     if(  (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
 617        || st->discard >= AVDISCARD_ALL){
 618         av_free_packet(pkt);
 619         return -1;
 620     }
 621
 622     pkt->stream_index = st->index;
 623
 624 #if 0
 625     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 626         if(st->codec->codec_id == CODEC_ID_RV20){
 627             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 628             av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
 629
 630             seq |= (*timestamp&~0x3FFF);
 631             if(seq - *timestamp >  0x2000) seq -= 0x4000;
 632             if(seq - *timestamp < -0x2000) seq += 0x4000;
 633         }
 634     }
 635 #endif
 636
 637     pkt->pts= *timestamp;
 638     if (*flags & 2)
 639         pkt->flags |= PKT_FLAG_KEY;
 640
 641     return 0;
 642 }
 643
 644 void
 645 ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt)
 646 {
 647     ByteIOContext *pb = s->pb;
 648     RMContext *rm = s->priv_data;
 649
 650     assert (rm->audio_pkt_cnt > 0);
 651
 652     if (st->codec->codec_id == CODEC_ID_AAC)
 653         av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
 654     else {
 655         av_new_packet(pkt, st->codec->block_align);
 656         memcpy(pkt->data, rm->audiobuf + st->codec->block_align *
 657                (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 658                st->codec->block_align);
 659     }
 660     rm->audio_pkt_cnt--;
 661     pkt->flags = 0;
 662     pkt->stream_index = st->index;
 663 }
 664
 665 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 666 {
 667     RMContext *rm = s->priv_data;
 668     ByteIOContext *pb = s->pb;
 669     AVStream *st;
 670     int i, len;
 671     int64_t timestamp, pos;
 672     int flags;
 673
 674     if (rm->audio_pkt_cnt) {
 675         // If there are queued audio packet return them first
 676         st = s->streams[rm->audio_stream_num];
 677         ff_rm_retrieve_cache(s, st, pkt);
 678     } else if (rm->old_format) {
 679         st = s->streams[0];
 680         if (st->codec->codec_id == CODEC_ID_RA_288) {
 681             int x, y;
 682
 683             for (y = 0; y < rm->sub_packet_h; y++)
 684                 for (x = 0; x < rm->sub_packet_h/2; x++)
 685                     if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)
 686                         return AVERROR(EIO);
 687             rm->audio_stream_num = 0;
 688             rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;
 689             // Release first audio packet
 690             av_new_packet(pkt, st->codec->block_align);
 691             memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
 692             pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
 693             pkt->stream_index = 0;
 694         } else {
 695             /* just read raw bytes */
 696             len = RAW_PACKET_SIZE;
 697             len= av_get_packet(pb, pkt, len);
 698             pkt->stream_index = 0;
 699             if (len <= 0) {
 700                 return AVERROR(EIO);
 701             }
 702             pkt->size = len;
 703         }
 704         rm_ac3_swap_bytes(st, pkt);
 705     } else {
 706         int seq=1;
 707 resync:
 708         len=sync(s, &timestamp, &flags, &i, &pos);
 709         if(len<0)
 710             return AVERROR(EIO);
 711         st = s->streams[i];
 712
 713         if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, &timestamp) < 0)
 714             goto resync;
 715
 716         if((flags&2) && (seq&0x7F) == 1)
 717             av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 718     }
 719
 720     return 0;
 721 }
 722
 723 static int rm_read_close(AVFormatContext *s)
 724 {
 725     RMContext *rm = s->priv_data;
 726
 727     av_free(rm->audiobuf);
 728     av_free(rm->videobuf);
 729     return 0;
 730 }
 731
 732 static int rm_probe(AVProbeData *p)
 733 {
 734     /* check file header */
 735     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 736          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 737          p->buf[4] == 0 && p->buf[5] == 0) ||
 738         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 739          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 740         return AVPROBE_SCORE_MAX;
 741     else
 742         return 0;
 743 }
 744
 745 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 746                                int64_t *ppos, int64_t pos_limit)
 747 {
 748     RMContext *rm = s->priv_data;
 749     int64_t pos, dts;
 750     int stream_index2, flags, len, h;
 751
 752     pos = *ppos;
 753
 754     if(rm->old_format)
 755         return AV_NOPTS_VALUE;
 756
 757     url_fseek(s->pb, pos, SEEK_SET);
 758     rm->remaining_len=0;
 759     for(;;){
 760         int seq=1;
 761         AVStream *st;
 762
 763         len=sync(s, &dts, &flags, &stream_index2, &pos);
 764         if(len<0)
 765             return AV_NOPTS_VALUE;
 766
 767         st = s->streams[stream_index2];
 768         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 769             h= get_byte(s->pb); len--;
 770             if(!(h & 0x40)){
 771                 seq = get_byte(s->pb); len--;
 772             }
 773         }
 774
 775         if((flags&2) && (seq&0x7F) == 1){
 776 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
 777             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 778             if(stream_index2 == stream_index)
 779                 break;
 780         }
 781
 782         url_fskip(s->pb, len);
 783     }
 784     *ppos = pos;
 785     return dts;
 786 }
 787
 788 AVInputFormat rm_demuxer = {
 789     "rm",
 790     NULL_IF_CONFIG_SMALL("RM format"),
 791     sizeof(RMContext),
 792     rm_probe,
 793     rm_read_header,
 794     rm_read_packet,
 795     rm_read_close,
 796     NULL,
 797     rm_read_dts,
 798 };