libavformat/rmdec.c

   1 /*
   2  * "Real" compatible demuxer.
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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/channel_layout.h"
  24 #include "libavutil/intreadwrite.h"
  25 #include "libavutil/dict.h"
  26 #include "avformat.h"
  27 #include "internal.h"
  28 #include "rmsipr.h"
  29 #include "rm.h"
  30
  31 #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/Atrac
  32 #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed
  33 #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8
  34 #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro
  35 #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC
  36 #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC
  37
  38 struct RMStream {
  39     AVPacket pkt;      ///< place to store merged video frame / reordered audio data
  40     int videobufsize;  ///< current assembled frame size
  41     int videobufpos;   ///< position for the next slice in the video buffer
  42     int curpic_num;    ///< picture number of current frame
  43     int cur_slice, slices;
  44     int64_t pktpos;    ///< first slice position in file
  45     /// Audio descrambling matrix parameters
  46     int64_t audiotimestamp; ///< Audio packet timestamp
  47     int sub_packet_cnt; // Subpacket counter, used while reading
  48     int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
  49     int audio_framesize; /// Audio frame size from container
  50     int sub_packet_lengths[16]; /// Length of each subpacket
  51     int32_t deint_id;  ///< deinterleaver used in audio stream
  52 };
  53
  54 typedef struct {
  55     int nb_packets;
  56     int old_format;
  57     int current_stream;
  58     int remaining_len;
  59     int audio_stream_num; ///< Stream number for audio packets
  60     int audio_pkt_cnt; ///< Output packet counter
  61 } RMDemuxContext;
  62
  63 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
  64 {
  65     int i;
  66     char *q, r;
  67
  68     q = buf;
  69     for(i=0;i<len;i++) {
  70         r = avio_r8(pb);
  71         if (i < buf_size - 1)
  72             *q++ = r;
  73     }
  74     if (buf_size > 0) *q = '\0';
  75 }
  76
  77 static void get_str8(AVIOContext *pb, char *buf, int buf_size)
  78 {
  79     get_strl(pb, buf, buf_size, avio_r8(pb));
  80 }
  81
  82 static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
  83 {
  84     if (size >= 1<<24)
  85         return -1;
  86     avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
  87     if (!avctx->extradata)
  88         return AVERROR(ENOMEM);
  89     avctx->extradata_size = avio_read(pb, avctx->extradata, size);
  90     memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  91     if (avctx->extradata_size != size)
  92         return AVERROR(EIO);
  93     return 0;
  94 }
  95
  96 static void rm_read_metadata(AVFormatContext *s, int wide)
  97 {
  98     char buf[1024];
  99     int i;
 100     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
 101         int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);
 102         get_strl(s->pb, buf, sizeof(buf), len);
 103         av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
 104     }
 105 }
 106
 107 RMStream *ff_rm_alloc_rmstream (void)
 108 {
 109     RMStream *rms = av_mallocz(sizeof(RMStream));
 110     rms->curpic_num = -1;
 111     return rms;
 112 }
 113
 114 void ff_rm_free_rmstream (RMStream *rms)
 115 {
 116     av_free_packet(&rms->pkt);
 117 }
 118
 119 static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
 120                                      AVStream *st, RMStream *ast, int read_all)
 121 {
 122     char buf[256];
 123     uint32_t version;
 124     int ret;
 125
 126     /* ra type header */
 127     version = avio_rb16(pb); /* version */
 128     if (version == 3) {
 129         int header_size = avio_rb16(pb);
 130         int64_t startpos = avio_tell(pb);
 131         avio_skip(pb, 14);
 132         rm_read_metadata(s, 0);
 133         if ((startpos + header_size) >= avio_tell(pb) + 2) {
 134             // fourcc (should always be "lpcJ")
 135             avio_r8(pb);
 136             get_str8(pb, buf, sizeof(buf));
 137         }
 138         // Skip extra header crap (this should never happen)
 139         if ((startpos + header_size) > avio_tell(pb))
 140             avio_skip(pb, header_size + startpos - avio_tell(pb));
 141         st->codec->sample_rate = 8000;
 142         st->codec->channels = 1;
 143         st->codec->channel_layout = AV_CH_LAYOUT_MONO;
 144         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 145         st->codec->codec_id = AV_CODEC_ID_RA_144;
 146         ast->deint_id = DEINT_ID_INT0;
 147     } else {
 148         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
 149         int codecdata_length;
 150         /* old version (4) */
 151         avio_skip(pb, 2); /* unused */
 152         avio_rb32(pb); /* .ra4 */
 153         avio_rb32(pb); /* data size */
 154         avio_rb16(pb); /* version2 */
 155         avio_rb32(pb); /* header size */
 156         flavor= avio_rb16(pb); /* add codec info / flavor */
 157         ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
 158         avio_rb32(pb); /* ??? */
 159         avio_rb32(pb); /* ??? */
 160         avio_rb32(pb); /* ??? */
 161         ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
 162         st->codec->block_align= avio_rb16(pb); /* frame size */
 163         ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
 164         avio_rb16(pb); /* ??? */
 165         if (version == 5) {
 166             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
 167         }
 168         st->codec->sample_rate = avio_rb16(pb);
 169         avio_rb32(pb);
 170         st->codec->channels = avio_rb16(pb);
 171         if (version == 5) {
 172             ast->deint_id = avio_rl32(pb);
 173             avio_read(pb, buf, 4);
 174             buf[4] = 0;
 175         } else {
 176             get_str8(pb, buf, sizeof(buf)); /* desc */
 177             ast->deint_id = AV_RL32(buf);
 178             get_str8(pb, buf, sizeof(buf)); /* desc */
 179         }
 180         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 181         st->codec->codec_tag  = AV_RL32(buf);
 182         st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
 183                                                 st->codec->codec_tag);
 184
 185         switch (st->codec->codec_id) {
 186         case AV_CODEC_ID_AC3:
 187             st->need_parsing = AVSTREAM_PARSE_FULL;
 188             break;
 189         case AV_CODEC_ID_RA_288:
 190             st->codec->extradata_size= 0;
 191             ast->audio_framesize = st->codec->block_align;
 192             st->codec->block_align = coded_framesize;
 193             break;
 194         case AV_CODEC_ID_COOK:
 195             st->need_parsing = AVSTREAM_PARSE_HEADERS;
 196         case AV_CODEC_ID_ATRAC3:
 197         case AV_CODEC_ID_SIPR:
 198             avio_rb16(pb); avio_r8(pb);
 199             if (version == 5)
 200                 avio_r8(pb);
 201             codecdata_length = avio_rb32(pb);
 202             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 203                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 204                 return -1;
 205             }
 206
 207             ast->audio_framesize = st->codec->block_align;
 208             if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
 209                 if (flavor > 3) {
 210                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
 211                            flavor);
 212                     return -1;
 213                 }
 214                 st->codec->block_align = ff_sipr_subpk_size[flavor];
 215             } else {
 216                 if(sub_packet_size <= 0){
 217                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
 218                     return -1;
 219                 }
 220                 st->codec->block_align = ast->sub_packet_size;
 221             }
 222             if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
 223                 return ret;
 224             break;
 225         case AV_CODEC_ID_AAC:
 226             avio_rb16(pb); avio_r8(pb);
 227             if (version == 5)
 228                 avio_r8(pb);
 229             codecdata_length = avio_rb32(pb);
 230             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 231                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 232                 return -1;
 233             }
 234             if (codecdata_length >= 1) {
 235                 avio_r8(pb);
 236                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
 237                     return ret;
 238             }
 239             break;
 240         default:
 241             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
 242         }
 243         if (ast->deint_id == DEINT_ID_INT4 ||
 244             ast->deint_id == DEINT_ID_GENR ||
 245             ast->deint_id == DEINT_ID_SIPR) {
 246             if (st->codec->block_align <= 0 ||
 247                 ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
 248                 ast->audio_framesize * sub_packet_h < st->codec->block_align)
 249                 return AVERROR_INVALIDDATA;
 250             if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
 251                 return AVERROR(ENOMEM);
 252         }
 253         switch (ast->deint_id) {
 254         case DEINT_ID_INT4:
 255             if (ast->coded_framesize > ast->audio_framesize ||
 256                 sub_packet_h <= 1 ||
 257                 ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
 258                 return AVERROR_INVALIDDATA;
 259             break;
 260         case DEINT_ID_GENR:
 261             if (ast->sub_packet_size <= 0 ||
 262                 ast->sub_packet_size > ast->audio_framesize)
 263                 return AVERROR_INVALIDDATA;
 264             break;
 265         case DEINT_ID_SIPR:
 266         case DEINT_ID_INT0:
 267         case DEINT_ID_VBRS:
 268         case DEINT_ID_VBRF:
 269             break;
 270         default:
 271             av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);
 272             return AVERROR_INVALIDDATA;
 273         }
 274
 275         if (read_all) {
 276             avio_r8(pb);
 277             avio_r8(pb);
 278             avio_r8(pb);
 279             rm_read_metadata(s, 0);
 280         }
 281     }
 282     return 0;
 283 }
 284
 285 int
 286 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
 287                            AVStream *st, RMStream *rst, int codec_data_size)
 288 {
 289     unsigned int v;
 290     int size;
 291     int64_t codec_pos;
 292     int ret;
 293
 294     avpriv_set_pts_info(st, 64, 1, 1000);
 295     codec_pos = avio_tell(pb);
 296     v = avio_rb32(pb);
 297     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
 298         /* ra type header */
 299         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
 300             return -1;
 301     } else if (v == MKBETAG('L', 'S', 'D', ':')) {
 302         avio_seek(pb, -4, SEEK_CUR);
 303         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size)) < 0)
 304             return ret;
 305
 306         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 307         st->codec->codec_tag  = AV_RL32(st->codec->extradata);
 308         st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
 309                                                 st->codec->codec_tag);
 310     } else {
 311         int fps;
 312         if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
 313         fail1:
 314             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
 315             goto skip;
 316         }
 317         st->codec->codec_tag = avio_rl32(pb);
 318         st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,
 319                                                st->codec->codec_tag);
 320         av_dlog(s, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
 321         if (st->codec->codec_id == AV_CODEC_ID_NONE)
 322             goto fail1;
 323         st->codec->width  = avio_rb16(pb);
 324         st->codec->height = avio_rb16(pb);
 325         avio_skip(pb, 2); // looks like bits per sample
 326         avio_skip(pb, 4); // always zero?
 327         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 328         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
 329         fps = avio_rb32(pb);
 330
 331         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
 332             return ret;
 333
 334         av_reduce(&st->avg_frame_rate.den, &st->avg_frame_rate.num,
 335                   0x10000, fps, (1 << 30) - 1);
 336 #if FF_API_R_FRAME_RATE
 337         st->r_frame_rate = st->avg_frame_rate;
 338 #endif
 339     }
 340
 341 skip:
 342     /* skip codec info */
 343     size = avio_tell(pb) - codec_pos;
 344     avio_skip(pb, codec_data_size - size);
 345
 346     return 0;
 347 }
 348
 349 /** this function assumes that the demuxer has already seeked to the start
 350  * of the INDX chunk, and will bail out if not. */
 351 static int rm_read_index(AVFormatContext *s)
 352 {
 353     AVIOContext *pb = s->pb;
 354     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
 355     AVStream *st;
 356
 357     do {
 358         if (avio_rl32(pb) != MKTAG('I','N','D','X'))
 359             return -1;
 360         size     = avio_rb32(pb);
 361         if (size < 20)
 362             return -1;
 363         avio_skip(pb, 2);
 364         n_pkts   = avio_rb32(pb);
 365         str_id   = avio_rb16(pb);
 366         next_off = avio_rb32(pb);
 367         for (n = 0; n < s->nb_streams; n++)
 368             if (s->streams[n]->id == str_id) {
 369                 st = s->streams[n];
 370                 break;
 371             }
 372         if (n == s->nb_streams) {
 373             av_log(s, AV_LOG_ERROR,
 374                    "Invalid stream index %d for index at pos %"PRId64"\n",
 375                    str_id, avio_tell(pb));
 376             goto skip;
 377         } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
 378             av_log(s, AV_LOG_ERROR,
 379                    "Nr. of packets in packet index for stream index %d "
 380                    "exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",
 381                    str_id, avio_size(pb), avio_tell(pb),
 382                    (avio_size(pb) - avio_tell(pb)) / 14);
 383             goto skip;
 384         }
 385
 386         for (n = 0; n < n_pkts; n++) {
 387             avio_skip(pb, 2);
 388             pts = avio_rb32(pb);
 389             pos = avio_rb32(pb);
 390             avio_skip(pb, 4); /* packet no. */
 391
 392             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
 393         }
 394
 395 skip:
 396         if (next_off && avio_tell(pb) < next_off &&
 397             avio_seek(pb, next_off, SEEK_SET) < 0) {
 398             av_log(s, AV_LOG_ERROR,
 399                    "Non-linear index detected, not supported\n");
 400             return -1;
 401         }
 402     } while (next_off);
 403
 404     return 0;
 405 }
 406
 407 static int rm_read_header_old(AVFormatContext *s)
 408 {
 409     RMDemuxContext *rm = s->priv_data;
 410     AVStream *st;
 411
 412     rm->old_format = 1;
 413     st = avformat_new_stream(s, NULL);
 414     if (!st)
 415         return -1;
 416     st->priv_data = ff_rm_alloc_rmstream();
 417     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
 418 }
 419
 420 static int rm_read_header(AVFormatContext *s)
 421 {
 422     RMDemuxContext *rm = s->priv_data;
 423     AVStream *st;
 424     AVIOContext *pb = s->pb;
 425     unsigned int tag;
 426     int tag_size;
 427     unsigned int start_time, duration;
 428     unsigned int data_off = 0, indx_off = 0;
 429     char buf[128];
 430     int flags = 0;
 431
 432     tag = avio_rl32(pb);
 433     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 434         /* very old .ra format */
 435         return rm_read_header_old(s);
 436     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 437         return AVERROR(EIO);
 438     }
 439
 440     tag_size = avio_rb32(pb);
 441     avio_skip(pb, tag_size - 8);
 442
 443     for(;;) {
 444         if (pb->eof_reached)
 445             return -1;
 446         tag = avio_rl32(pb);
 447         tag_size = avio_rb32(pb);
 448         avio_rb16(pb);
 449         av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
 450                 (tag      ) & 0xff,
 451                 (tag >>  8) & 0xff,
 452                 (tag >> 16) & 0xff,
 453                 (tag >> 24) & 0xff,
 454                 tag,
 455                 tag_size);
 456         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 457             return -1;
 458         switch(tag) {
 459         case MKTAG('P', 'R', 'O', 'P'):
 460             /* file header */
 461             avio_rb32(pb); /* max bit rate */
 462             avio_rb32(pb); /* avg bit rate */
 463             avio_rb32(pb); /* max packet size */
 464             avio_rb32(pb); /* avg packet size */
 465             avio_rb32(pb); /* nb packets */
 466             avio_rb32(pb); /* duration */
 467             avio_rb32(pb); /* preroll */
 468             indx_off = avio_rb32(pb); /* index offset */
 469             data_off = avio_rb32(pb); /* data offset */
 470             avio_rb16(pb); /* nb streams */
 471             flags = avio_rb16(pb); /* flags */
 472             break;
 473         case MKTAG('C', 'O', 'N', 'T'):
 474             rm_read_metadata(s, 1);
 475             break;
 476         case MKTAG('M', 'D', 'P', 'R'):
 477             st = avformat_new_stream(s, NULL);
 478             if (!st)
 479                 return AVERROR(ENOMEM);
 480             st->id = avio_rb16(pb);
 481             avio_rb32(pb); /* max bit rate */
 482             st->codec->bit_rate = avio_rb32(pb); /* bit rate */
 483             avio_rb32(pb); /* max packet size */
 484             avio_rb32(pb); /* avg packet size */
 485             start_time = avio_rb32(pb); /* start time */
 486             avio_rb32(pb); /* preroll */
 487             duration = avio_rb32(pb); /* duration */
 488             st->start_time = start_time;
 489             st->duration = duration;
 490             get_str8(pb, buf, sizeof(buf)); /* desc */
 491             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 492             st->codec->codec_type = AVMEDIA_TYPE_DATA;
 493             st->priv_data = ff_rm_alloc_rmstream();
 494             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
 495                                           avio_rb32(pb)) < 0)
 496                 return -1;
 497             break;
 498         case MKTAG('D', 'A', 'T', 'A'):
 499             goto header_end;
 500         default:
 501             /* unknown tag: skip it */
 502             avio_skip(pb, tag_size - 10);
 503             break;
 504         }
 505     }
 506  header_end:
 507     rm->nb_packets = avio_rb32(pb); /* number of packets */
 508     if (!rm->nb_packets && (flags & 4))
 509         rm->nb_packets = 3600 * 25;
 510     avio_rb32(pb); /* next data header */
 511
 512     if (!data_off)
 513         data_off = avio_tell(pb) - 18;
 514     if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
 515         avio_seek(pb, indx_off, SEEK_SET) >= 0) {
 516         rm_read_index(s);
 517         avio_seek(pb, data_off + 18, SEEK_SET);
 518     }
 519
 520     return 0;
 521 }
 522
 523 static int get_num(AVIOContext *pb, int *len)
 524 {
 525     int n, n1;
 526
 527     n = avio_rb16(pb);
 528     (*len)-=2;
 529     n &= 0x7FFF;
 530     if (n >= 0x4000) {
 531         return n - 0x4000;
 532     } else {
 533         n1 = avio_rb16(pb);
 534         (*len)-=2;
 535         return (n << 16) | n1;
 536     }
 537 }
 538
 539 /* multiple of 20 bytes for ra144 (ugly) */
 540 #define RAW_PACKET_SIZE 1000
 541
 542 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 543     RMDemuxContext *rm = s->priv_data;
 544     AVIOContext *pb = s->pb;
 545     AVStream *st;
 546     uint32_t state=0xFFFFFFFF;
 547
 548     while(!pb->eof_reached){
 549         int len, num, i;
 550         *pos= avio_tell(pb) - 3;
 551         if(rm->remaining_len > 0){
 552             num= rm->current_stream;
 553             len= rm->remaining_len;
 554             *timestamp = AV_NOPTS_VALUE;
 555             *flags= 0;
 556         }else{
 557             state= (state<<8) + avio_r8(pb);
 558
 559             if(state == MKBETAG('I', 'N', 'D', 'X')){
 560                 int n_pkts, expected_len;
 561                 len = avio_rb32(pb);
 562                 avio_skip(pb, 2);
 563                 n_pkts = avio_rb32(pb);
 564                 expected_len = 20 + n_pkts * 14;
 565                 if (len == 20)
 566                     /* some files don't add index entries to chunk size... */
 567                     len = expected_len;
 568                 else if (len != expected_len)
 569                     av_log(s, AV_LOG_WARNING,
 570                            "Index size %d (%d pkts) is wrong, should be %d.\n",
 571                            len, n_pkts, expected_len);
 572                 len -= 14; // we already read part of the index header
 573                 if(len<0)
 574                     continue;
 575                 goto skip;
 576             } else if (state == MKBETAG('D','A','T','A')) {
 577                 av_log(s, AV_LOG_WARNING,
 578                        "DATA tag in middle of chunk, file may be broken.\n");
 579             }
 580
 581             if(state > (unsigned)0xFFFF || state <= 12)
 582                 continue;
 583             len=state - 12;
 584             state= 0xFFFFFFFF;
 585
 586             num = avio_rb16(pb);
 587             *timestamp = avio_rb32(pb);
 588             avio_r8(pb); /* reserved */
 589             *flags = avio_r8(pb); /* flags */
 590         }
 591         for(i=0;i<s->nb_streams;i++) {
 592             st = s->streams[i];
 593             if (num == st->id)
 594                 break;
 595         }
 596         if (i == s->nb_streams) {
 597 skip:
 598             /* skip packet if unknown number */
 599             avio_skip(pb, len);
 600             rm->remaining_len = 0;
 601             continue;
 602         }
 603         *stream_index= i;
 604
 605         return len;
 606     }
 607     return -1;
 608 }
 609
 610 static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
 611                                    RMDemuxContext *rm, RMStream *vst,
 612                                    AVPacket *pkt, int len, int *pseq,
 613                                    int64_t *timestamp)
 614 {
 615     int hdr, seq, pic_num, len2, pos;
 616     int type;
 617
 618     hdr = avio_r8(pb); len--;
 619     type = hdr >> 6;
 620
 621     if(type != 3){  // not frame as a part of packet
 622         seq = avio_r8(pb); len--;
 623     }
 624     if(type != 1){  // not whole frame
 625         len2 = get_num(pb, &len);
 626         pos  = get_num(pb, &len);
 627         pic_num = avio_r8(pb); len--;
 628     }
 629     if(len<0)
 630         return -1;
 631     rm->remaining_len = len;
 632     if(type&1){     // frame, not slice
 633         if(type == 3){  // frame as a part of packet
 634             len= len2;
 635             *timestamp = pos;
 636         }
 637         if(rm->remaining_len < len)
 638             return -1;
 639         rm->remaining_len -= len;
 640         if(av_new_packet(pkt, len + 9) < 0)
 641             return AVERROR(EIO);
 642         pkt->data[0] = 0;
 643         AV_WL32(pkt->data + 1, 1);
 644         AV_WL32(pkt->data + 5, 0);
 645         avio_read(pb, pkt->data + 9, len);
 646         return 0;
 647     }
 648     //now we have to deal with single slice
 649
 650     *pseq = seq;
 651     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
 652         vst->slices = ((hdr & 0x3F) << 1) + 1;
 653         vst->videobufsize = len2 + 8*vst->slices + 1;
 654         av_free_packet(&vst->pkt); //FIXME this should be output.
 655         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
 656             return AVERROR(ENOMEM);
 657         vst->videobufpos = 8*vst->slices + 1;
 658         vst->cur_slice = 0;
 659         vst->curpic_num = pic_num;
 660         vst->pktpos = avio_tell(pb);
 661     }
 662     if(type == 2)
 663         len = FFMIN(len, pos);
 664
 665     if(++vst->cur_slice > vst->slices)
 666         return 1;
 667     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
 668     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
 669     if(vst->videobufpos + len > vst->videobufsize)
 670         return 1;
 671     if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
 672         return AVERROR(EIO);
 673     vst->videobufpos += len;
 674     rm->remaining_len-= len;
 675
 676     if (type == 2 || vst->videobufpos == vst->videobufsize) {
 677         vst->pkt.data[0] = vst->cur_slice-1;
 678         *pkt= vst->pkt;
 679         vst->pkt.data= NULL;
 680         vst->pkt.size= 0;
 681         vst->pkt.buf = NULL;
 682 #if FF_API_DESTRUCT_PACKET
 683         vst->pkt.destruct = NULL;
 684 #endif
 685         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
 686             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
 687                 vst->videobufpos - 1 - 8*vst->slices);
 688         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
 689         pkt->pts = AV_NOPTS_VALUE;
 690         pkt->pos = vst->pktpos;
 691         vst->slices = 0;
 692         return 0;
 693     }
 694
 695     return 1;
 696 }
 697
 698 static inline void
 699 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
 700 {
 701     uint8_t *ptr;
 702     int j;
 703
 704     if (st->codec->codec_id == AV_CODEC_ID_AC3) {
 705         ptr = pkt->data;
 706         for (j=0;j<pkt->size;j+=2) {
 707             FFSWAP(int, ptr[0], ptr[1]);
 708             ptr += 2;
 709         }
 710     }
 711 }
 712
 713 int
 714 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
 715                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
 716                     int *seq, int flags, int64_t timestamp)
 717 {
 718     RMDemuxContext *rm = s->priv_data;
 719
 720     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 721         rm->current_stream= st->id;
 722         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))
 723             return -1; //got partial frame
 724     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 725         if ((ast->deint_id == DEINT_ID_GENR) ||
 726             (ast->deint_id == DEINT_ID_INT4) ||
 727             (ast->deint_id == DEINT_ID_SIPR)) {
 728             int x;
 729             int sps = ast->sub_packet_size;
 730             int cfs = ast->coded_framesize;
 731             int h = ast->sub_packet_h;
 732             int y = ast->sub_packet_cnt;
 733             int w = ast->audio_framesize;
 734
 735             if (flags & 2)
 736                 y = ast->sub_packet_cnt = 0;
 737             if (!y)
 738                 ast->audiotimestamp = timestamp;
 739
 740             switch (ast->deint_id) {
 741                 case DEINT_ID_INT4:
 742                     for (x = 0; x < h/2; x++)
 743                         avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
 744                     break;
 745                 case DEINT_ID_GENR:
 746                     for (x = 0; x < w/sps; x++)
 747                         avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 748                     break;
 749                 case DEINT_ID_SIPR:
 750                     avio_read(pb, ast->pkt.data + y * w, w);
 751                     break;
 752             }
 753
 754             if (++(ast->sub_packet_cnt) < h)
 755                 return -1;
 756             if (ast->deint_id == DEINT_ID_SIPR)
 757                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
 758
 759              ast->sub_packet_cnt = 0;
 760              rm->audio_stream_num = st->index;
 761              rm->audio_pkt_cnt = h * w / st->codec->block_align;
 762         } else if ((ast->deint_id == DEINT_ID_VBRF) ||
 763                    (ast->deint_id == DEINT_ID_VBRS)) {
 764             int x;
 765             rm->audio_stream_num = st->index;
 766             ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
 767             if (ast->sub_packet_cnt) {
 768                 for (x = 0; x < ast->sub_packet_cnt; x++)
 769                     ast->sub_packet_lengths[x] = avio_rb16(pb);
 770                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
 771                 ast->audiotimestamp = timestamp;
 772             } else
 773                 return -1;
 774         } else {
 775             av_get_packet(pb, pkt, len);
 776             rm_ac3_swap_bytes(st, pkt);
 777         }
 778     } else
 779         av_get_packet(pb, pkt, len);
 780
 781     pkt->stream_index = st->index;
 782
 783 #if 0
 784     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 785         if(st->codec->codec_id == AV_CODEC_ID_RV20){
 786             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 787             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
 788
 789             seq |= (timestamp&~0x3FFF);
 790             if(seq - timestamp >  0x2000) seq -= 0x4000;
 791             if(seq - timestamp < -0x2000) seq += 0x4000;
 792         }
 793     }
 794 #endif
 795
 796     pkt->pts = timestamp;
 797     if (flags & 2)
 798         pkt->flags |= AV_PKT_FLAG_KEY;
 799
 800     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
 801 }
 802
 803 int
 804 ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
 805                       AVStream *st, RMStream *ast, AVPacket *pkt)
 806 {
 807     RMDemuxContext *rm = s->priv_data;
 808
 809     assert (rm->audio_pkt_cnt > 0);
 810
 811     if (ast->deint_id == DEINT_ID_VBRF ||
 812         ast->deint_id == DEINT_ID_VBRS)
 813         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
 814     else {
 815         av_new_packet(pkt, st->codec->block_align);
 816         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
 817                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 818                st->codec->block_align);
 819     }
 820     rm->audio_pkt_cnt--;
 821     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
 822         ast->audiotimestamp = AV_NOPTS_VALUE;
 823         pkt->flags = AV_PKT_FLAG_KEY;
 824     } else
 825         pkt->flags = 0;
 826     pkt->stream_index = st->index;
 827
 828     return rm->audio_pkt_cnt;
 829 }
 830
 831 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 832 {
 833     RMDemuxContext *rm = s->priv_data;
 834     AVStream *st;
 835     int i, len, res, seq = 1;
 836     int64_t timestamp, pos;
 837     int flags;
 838
 839     for (;;) {
 840         if (rm->audio_pkt_cnt) {
 841             // If there are queued audio packet return them first
 842             st = s->streams[rm->audio_stream_num];
 843             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
 844             flags = 0;
 845         } else {
 846             if (rm->old_format) {
 847                 RMStream *ast;
 848
 849                 st = s->streams[0];
 850                 ast = st->priv_data;
 851                 timestamp = AV_NOPTS_VALUE;
 852                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
 853                     ast->coded_framesize * ast->sub_packet_h / 2;
 854                 flags = (seq++ == 1) ? 2 : 0;
 855                 pos = avio_tell(s->pb);
 856             } else {
 857                 len=sync(s, &timestamp, &flags, &i, &pos);
 858                 if (len > 0)
 859                     st = s->streams[i];
 860             }
 861
 862             if(len<0 || s->pb->eof_reached)
 863                 return AVERROR(EIO);
 864
 865             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
 866                                       &seq, flags, timestamp);
 867             if((flags&2) && (seq&0x7F) == 1)
 868                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 869             if (res)
 870                 continue;
 871         }
 872
 873         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
 874            || st->discard >= AVDISCARD_ALL){
 875             av_free_packet(pkt);
 876         } else
 877             break;
 878     }
 879
 880     return 0;
 881 }
 882
 883 static int rm_read_close(AVFormatContext *s)
 884 {
 885     int i;
 886
 887     for (i=0;i<s->nb_streams;i++)
 888         ff_rm_free_rmstream(s->streams[i]->priv_data);
 889
 890     return 0;
 891 }
 892
 893 static int rm_probe(AVProbeData *p)
 894 {
 895     /* check file header */
 896     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 897          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 898          p->buf[4] == 0 && p->buf[5] == 0) ||
 899         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 900          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 901         return AVPROBE_SCORE_MAX;
 902     else
 903         return 0;
 904 }
 905
 906 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 907                                int64_t *ppos, int64_t pos_limit)
 908 {
 909     RMDemuxContext *rm = s->priv_data;
 910     int64_t pos, dts;
 911     int stream_index2, flags, len, h;
 912
 913     pos = *ppos;
 914
 915     if(rm->old_format)
 916         return AV_NOPTS_VALUE;
 917
 918     avio_seek(s->pb, pos, SEEK_SET);
 919     rm->remaining_len=0;
 920     for(;;){
 921         int seq=1;
 922         AVStream *st;
 923
 924         len=sync(s, &dts, &flags, &stream_index2, &pos);
 925         if(len<0)
 926             return AV_NOPTS_VALUE;
 927
 928         st = s->streams[stream_index2];
 929         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 930             h= avio_r8(s->pb); len--;
 931             if(!(h & 0x40)){
 932                 seq = avio_r8(s->pb); len--;
 933             }
 934         }
 935
 936         if((flags&2) && (seq&0x7F) == 1){
 937             av_dlog(s, "%d %d-%d %"PRId64" %d\n",
 938                     flags, stream_index2, stream_index, dts, seq);
 939             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 940             if(stream_index2 == stream_index)
 941                 break;
 942         }
 943
 944         avio_skip(s->pb, len);
 945     }
 946     *ppos = pos;
 947     return dts;
 948 }
 949
 950 AVInputFormat ff_rm_demuxer = {
 951     .name           = "rm",
 952     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),
 953     .priv_data_size = sizeof(RMDemuxContext),
 954     .read_probe     = rm_probe,
 955     .read_header    = rm_read_header,
 956     .read_packet    = rm_read_packet,
 957     .read_close     = rm_read_close,
 958     .read_timestamp = rm_read_dts,
 959 };
 960
 961 AVInputFormat ff_rdt_demuxer = {
 962     .name           = "rdt",
 963     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),
 964     .priv_data_size = sizeof(RMDemuxContext),
 965     .read_close     = rm_read_close,
 966     .flags          = AVFMT_NOFILE,
 967 };