libavformat/rmdec.c

   1 /*
   2  * "Real" compatible demuxer.
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/avstring.h"
  23 #include "libavutil/intreadwrite.h"
  24 #include "avformat.h"
  25 #include "rm.h"
  26
  27 struct RMStream {
  28     AVPacket pkt;      ///< place to store merged video frame / reordered audio data
  29     int videobufsize;  ///< current assembled frame size
  30     int videobufpos;   ///< position for the next slice in the video buffer
  31     int curpic_num;    ///< picture number of current frame
  32     int cur_slice, slices;
  33     int64_t pktpos;    ///< first slice position in file
  34     /// Audio descrambling matrix parameters
  35     int64_t audiotimestamp; ///< Audio packet timestamp
  36     int sub_packet_cnt; // Subpacket counter, used while reading
  37     int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
  38     int audio_framesize; /// Audio frame size from container
  39     int sub_packet_lengths[16]; /// Length of each subpacket
  40 };
  41
  42 typedef struct {
  43     int nb_packets;
  44     int old_format;
  45     int current_stream;
  46     int remaining_len;
  47     int audio_stream_num; ///< Stream number for audio packets
  48     int audio_pkt_cnt; ///< Output packet counter
  49 } RMDemuxContext;
  50
  51 static const unsigned char sipr_swaps[38][2] = {
  52     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
  53     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
  54     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
  55     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
  56     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
  57     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
  58     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
  59     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
  60     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
  61     { 67, 83 }, { 77, 80 }
  62 };
  63
  64 static const unsigned char sipr_subpk_size[4] = { 29, 19, 37, 20 };
  65
  66 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
  67 {
  68     int i;
  69     char *q, r;
  70
  71     q = buf;
  72     for(i=0;i<len;i++) {
  73         r = get_byte(pb);
  74         if (i < buf_size - 1)
  75             *q++ = r;
  76     }
  77     if (buf_size > 0) *q = '\0';
  78 }
  79
  80 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
  81 {
  82     get_strl(pb, buf, buf_size, get_byte(pb));
  83 }
  84
  85 static void rm_read_metadata(AVFormatContext *s, int wide)
  86 {
  87     char buf[1024];
  88     int i;
  89     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
  90         int len = wide ? get_be16(s->pb) : get_byte(s->pb);
  91         get_strl(s->pb, buf, sizeof(buf), len);
  92         av_metadata_set(&s->metadata, ff_rm_metadata[i], buf);
  93     }
  94 }
  95
  96 RMStream *ff_rm_alloc_rmstream (void)
  97 {
  98     RMStream *rms = av_mallocz(sizeof(RMStream));
  99     rms->curpic_num = -1;
 100     return rms;
 101 }
 102
 103 void ff_rm_free_rmstream (RMStream *rms)
 104 {
 105     av_free_packet(&rms->pkt);
 106 }
 107
 108 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
 109                                      AVStream *st, RMStream *ast, int read_all)
 110 {
 111     char buf[256];
 112     uint32_t version;
 113
 114     /* ra type header */
 115     version = get_be32(pb); /* version */
 116     if (((version >> 16) & 0xff) == 3) {
 117         int64_t startpos = url_ftell(pb);
 118         url_fskip(pb, 14);
 119         rm_read_metadata(s, 0);
 120         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
 121             // fourcc (should always be "lpcJ")
 122             get_byte(pb);
 123             get_str8(pb, buf, sizeof(buf));
 124         }
 125         // Skip extra header crap (this should never happen)
 126         if ((startpos + (version & 0xffff)) > url_ftell(pb))
 127             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
 128         st->codec->sample_rate = 8000;
 129         st->codec->channels = 1;
 130         st->codec->codec_type = CODEC_TYPE_AUDIO;
 131         st->codec->codec_id = CODEC_ID_RA_144;
 132     } else {
 133         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
 134         /* old version (4) */
 135         get_be32(pb); /* .ra4 */
 136         get_be32(pb); /* data size */
 137         get_be16(pb); /* version2 */
 138         get_be32(pb); /* header size */
 139         flavor= get_be16(pb); /* add codec info / flavor */
 140         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
 141         get_be32(pb); /* ??? */
 142         get_be32(pb); /* ??? */
 143         get_be32(pb); /* ??? */
 144         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
 145         st->codec->block_align= get_be16(pb); /* frame size */
 146         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
 147         get_be16(pb); /* ??? */
 148         if (((version >> 16) & 0xff) == 5) {
 149             get_be16(pb); get_be16(pb); get_be16(pb);
 150         }
 151         st->codec->sample_rate = get_be16(pb);
 152         get_be32(pb);
 153         st->codec->channels = get_be16(pb);
 154         if (((version >> 16) & 0xff) == 5) {
 155             get_be32(pb);
 156             get_buffer(pb, buf, 4);
 157             buf[4] = 0;
 158         } else {
 159             get_str8(pb, buf, sizeof(buf)); /* desc */
 160             get_str8(pb, buf, sizeof(buf)); /* desc */
 161         }
 162         st->codec->codec_type = CODEC_TYPE_AUDIO;
 163         if (!strcmp(buf, "dnet")) {
 164             st->codec->codec_id = CODEC_ID_AC3;
 165             st->need_parsing = AVSTREAM_PARSE_FULL;
 166         } else if (!strcmp(buf, "28_8")) {
 167             st->codec->codec_id = CODEC_ID_RA_288;
 168             st->codec->extradata_size= 0;
 169             ast->audio_framesize = st->codec->block_align;
 170             st->codec->block_align = coded_framesize;
 171
 172             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 173                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
 174                 return -1;
 175             }
 176
 177             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 178         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
 179             int codecdata_length;
 180             get_be16(pb); get_byte(pb);
 181             if (((version >> 16) & 0xff) == 5)
 182                 get_byte(pb);
 183             codecdata_length = get_be32(pb);
 184             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 185                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 186                 return -1;
 187             }
 188
 189             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
 190             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
 191             else st->codec->codec_id = CODEC_ID_ATRAC3;
 192
 193             ast->audio_framesize = st->codec->block_align;
 194             if (st->codec->codec_id == CODEC_ID_SIPR) {
 195                 if (flavor > 3) {
 196                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
 197                            flavor);
 198                     return -1;
 199                 }
 200                 st->codec->block_align = sipr_subpk_size[flavor];
 201             } else {
 202                 if(sub_packet_size <= 0){
 203                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
 204                     return -1;
 205                 }
 206                 st->codec->block_align = ast->sub_packet_size;
 207             }
 208             st->codec->extradata_size= codecdata_length;
 209             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 210             get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 211
 212             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
 213                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 214                 return -1;
 215             }
 216
 217             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
 218         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
 219             int codecdata_length;
 220             get_be16(pb); get_byte(pb);
 221             if (((version >> 16) & 0xff) == 5)
 222                 get_byte(pb);
 223             st->codec->codec_id = CODEC_ID_AAC;
 224             codecdata_length = get_be32(pb);
 225             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 226                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 227                 return -1;
 228             }
 229             if (codecdata_length >= 1) {
 230                 st->codec->extradata_size = codecdata_length - 1;
 231                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 232                 get_byte(pb);
 233                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 234             }
 235         } else {
 236             st->codec->codec_id = CODEC_ID_NONE;
 237             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
 238         }
 239         if (read_all) {
 240             get_byte(pb);
 241             get_byte(pb);
 242             get_byte(pb);
 243             rm_read_metadata(s, 0);
 244         }
 245     }
 246     return 0;
 247 }
 248
 249 int
 250 ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
 251                            AVStream *st, RMStream *rst, int codec_data_size)
 252 {
 253     unsigned int v;
 254     int size;
 255     int64_t codec_pos;
 256
 257     av_set_pts_info(st, 64, 1, 1000);
 258     codec_pos = url_ftell(pb);
 259     v = get_be32(pb);
 260     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
 261         /* ra type header */
 262         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
 263             return -1;
 264     } else {
 265         int fps, fps2;
 266         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
 267         fail1:
 268             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
 269             goto skip;
 270         }
 271         st->codec->codec_tag = get_le32(pb);
 272 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
 273         if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
 274             && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
 275             && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
 276             && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')
 277             && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))
 278             goto fail1;
 279         st->codec->width = get_be16(pb);
 280         st->codec->height = get_be16(pb);
 281         st->codec->time_base.num= 1;
 282         fps= get_be16(pb);
 283         st->codec->codec_type = CODEC_TYPE_VIDEO;
 284         get_be32(pb);
 285         fps2= get_be16(pb);
 286         get_be16(pb);
 287
 288         st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
 289
 290         if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
 291             //check is redundant as get_buffer() will catch this
 292             av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
 293             return -1;
 294         }
 295         st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 296         if (!st->codec->extradata)
 297             return AVERROR(ENOMEM);
 298         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 299
 300 //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
 301         st->codec->time_base.den = fps * st->codec->time_base.num;
 302         switch(((uint8_t*)st->codec->extradata)[4]>>4){
 303         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
 304         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
 305         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
 306         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
 307         default: goto fail1;
 308         }
 309     }
 310
 311 skip:
 312     /* skip codec info */
 313     size = url_ftell(pb) - codec_pos;
 314     url_fskip(pb, codec_data_size - size);
 315
 316     return 0;
 317 }
 318
 319 /** this function assumes that the demuxer has already seeked to the start
 320  * of the INDX chunk, and will bail out if not. */
 321 static int rm_read_index(AVFormatContext *s)
 322 {
 323     ByteIOContext *pb = s->pb;
 324     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
 325     AVStream *st;
 326
 327     do {
 328         if (get_le32(pb) != MKTAG('I','N','D','X'))
 329             return -1;
 330         size     = get_be32(pb);
 331         if (size < 20)
 332             return -1;
 333         url_fskip(pb, 2);
 334         n_pkts   = get_be32(pb);
 335         str_id   = get_be16(pb);
 336         next_off = get_be32(pb);
 337         for (n = 0; n < s->nb_streams; n++)
 338             if (s->streams[n]->id == str_id) {
 339                 st = s->streams[n];
 340                 break;
 341             }
 342         if (n == s->nb_streams)
 343             goto skip;
 344
 345         for (n = 0; n < n_pkts; n++) {
 346             url_fskip(pb, 2);
 347             pts = get_be32(pb);
 348             pos = get_be32(pb);
 349             url_fskip(pb, 4); /* packet no. */
 350
 351             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
 352         }
 353
 354 skip:
 355         if (next_off && url_ftell(pb) != next_off &&
 356             url_fseek(pb, next_off, SEEK_SET) < 0)
 357             return -1;
 358     } while (next_off);
 359
 360     return 0;
 361 }
 362
 363 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 364 {
 365     RMDemuxContext *rm = s->priv_data;
 366     AVStream *st;
 367
 368     rm->old_format = 1;
 369     st = av_new_stream(s, 0);
 370     if (!st)
 371         return -1;
 372     st->priv_data = ff_rm_alloc_rmstream();
 373     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
 374 }
 375
 376 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 377 {
 378     RMDemuxContext *rm = s->priv_data;
 379     AVStream *st;
 380     ByteIOContext *pb = s->pb;
 381     unsigned int tag;
 382     int tag_size;
 383     unsigned int start_time, duration;
 384     unsigned int data_off = 0, indx_off = 0;
 385     char buf[128];
 386     int flags = 0;
 387
 388     tag = get_le32(pb);
 389     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 390         /* very old .ra format */
 391         return rm_read_header_old(s, ap);
 392     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 393         return AVERROR(EIO);
 394     }
 395
 396     get_be32(pb); /* header size */
 397     get_be16(pb);
 398     get_be32(pb);
 399     get_be32(pb); /* number of headers */
 400
 401     for(;;) {
 402         if (url_feof(pb))
 403             return -1;
 404         tag = get_le32(pb);
 405         tag_size = get_be32(pb);
 406         get_be16(pb);
 407 #if 0
 408         printf("tag=%c%c%c%c (%08x) size=%d\n",
 409                (tag) & 0xff,
 410                (tag >> 8) & 0xff,
 411                (tag >> 16) & 0xff,
 412                (tag >> 24) & 0xff,
 413                tag,
 414                tag_size);
 415 #endif
 416         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 417             return -1;
 418         switch(tag) {
 419         case MKTAG('P', 'R', 'O', 'P'):
 420             /* file header */
 421             get_be32(pb); /* max bit rate */
 422             get_be32(pb); /* avg bit rate */
 423             get_be32(pb); /* max packet size */
 424             get_be32(pb); /* avg packet size */
 425             get_be32(pb); /* nb packets */
 426             get_be32(pb); /* duration */
 427             get_be32(pb); /* preroll */
 428             indx_off = get_be32(pb); /* index offset */
 429             data_off = get_be32(pb); /* data offset */
 430             get_be16(pb); /* nb streams */
 431             flags = get_be16(pb); /* flags */
 432             break;
 433         case MKTAG('C', 'O', 'N', 'T'):
 434             rm_read_metadata(s, 1);
 435             break;
 436         case MKTAG('M', 'D', 'P', 'R'):
 437             st = av_new_stream(s, 0);
 438             if (!st)
 439                 return AVERROR(ENOMEM);
 440             st->id = get_be16(pb);
 441             get_be32(pb); /* max bit rate */
 442             st->codec->bit_rate = get_be32(pb); /* bit rate */
 443             get_be32(pb); /* max packet size */
 444             get_be32(pb); /* avg packet size */
 445             start_time = get_be32(pb); /* start time */
 446             get_be32(pb); /* preroll */
 447             duration = get_be32(pb); /* duration */
 448             st->start_time = start_time;
 449             st->duration = duration;
 450             get_str8(pb, buf, sizeof(buf)); /* desc */
 451             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 452             st->codec->codec_type = CODEC_TYPE_DATA;
 453             st->priv_data = ff_rm_alloc_rmstream();
 454             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
 455                                           get_be32(pb)) < 0)
 456                 return -1;
 457             break;
 458         case MKTAG('D', 'A', 'T', 'A'):
 459             goto header_end;
 460         default:
 461             /* unknown tag: skip it */
 462             url_fskip(pb, tag_size - 10);
 463             break;
 464         }
 465     }
 466  header_end:
 467     rm->nb_packets = get_be32(pb); /* number of packets */
 468     if (!rm->nb_packets && (flags & 4))
 469         rm->nb_packets = 3600 * 25;
 470     get_be32(pb); /* next data header */
 471
 472     if (!data_off)
 473         data_off = url_ftell(pb) - 18;
 474     if (indx_off && url_fseek(pb, indx_off, SEEK_SET) >= 0) {
 475         rm_read_index(s);
 476         url_fseek(pb, data_off + 18, SEEK_SET);
 477     }
 478
 479     return 0;
 480 }
 481
 482 static int get_num(ByteIOContext *pb, int *len)
 483 {
 484     int n, n1;
 485
 486     n = get_be16(pb);
 487     (*len)-=2;
 488     n &= 0x7FFF;
 489     if (n >= 0x4000) {
 490         return n - 0x4000;
 491     } else {
 492         n1 = get_be16(pb);
 493         (*len)-=2;
 494         return (n << 16) | n1;
 495     }
 496 }
 497
 498 /* multiple of 20 bytes for ra144 (ugly) */
 499 #define RAW_PACKET_SIZE 1000
 500
 501 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 502     RMDemuxContext *rm = s->priv_data;
 503     ByteIOContext *pb = s->pb;
 504     AVStream *st;
 505     uint32_t state=0xFFFFFFFF;
 506
 507     while(!url_feof(pb)){
 508         int len, num, res, i;
 509         *pos= url_ftell(pb) - 3;
 510         if(rm->remaining_len > 0){
 511             num= rm->current_stream;
 512             len= rm->remaining_len;
 513             *timestamp = AV_NOPTS_VALUE;
 514             *flags= 0;
 515         }else{
 516             state= (state<<8) + get_byte(pb);
 517
 518             if(state == MKBETAG('I', 'N', 'D', 'X')){
 519                 int n_pkts, expected_len;
 520                 len = get_be32(pb);
 521                 url_fskip(pb, 2);
 522                 n_pkts = get_be32(pb);
 523                 expected_len = 20 + n_pkts * 14;
 524                 if (len == 20)
 525                     /* some files don't add index entries to chunk size... */
 526                     len = expected_len;
 527                 else if (len != expected_len)
 528                     av_log(s, AV_LOG_WARNING,
 529                            "Index size %d (%d pkts) is wrong, should be %d.\n",
 530                            len, n_pkts, expected_len);
 531                 len -= 14; // we already read part of the index header
 532                 if(len<0)
 533                     continue;
 534                 goto skip;
 535             }
 536
 537             if(state > (unsigned)0xFFFF || state <= 12)
 538                 continue;
 539             len=state - 12;
 540             state= 0xFFFFFFFF;
 541
 542             num = get_be16(pb);
 543             *timestamp = get_be32(pb);
 544             res= get_byte(pb); /* reserved */
 545             *flags = get_byte(pb); /* flags */
 546         }
 547         for(i=0;i<s->nb_streams;i++) {
 548             st = s->streams[i];
 549             if (num == st->id)
 550                 break;
 551         }
 552         if (i == s->nb_streams) {
 553 skip:
 554             /* skip packet if unknown number */
 555             url_fskip(pb, len);
 556             rm->remaining_len = 0;
 557             continue;
 558         }
 559         *stream_index= i;
 560
 561         return len;
 562     }
 563     return -1;
 564 }
 565
 566 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
 567                                    RMDemuxContext *rm, RMStream *vst,
 568                                    AVPacket *pkt, int len, int *pseq)
 569 {
 570     int hdr, seq, pic_num, len2, pos;
 571     int type;
 572
 573     hdr = get_byte(pb); len--;
 574     type = hdr >> 6;
 575
 576     if(type != 3){  // not frame as a part of packet
 577         seq = get_byte(pb); len--;
 578     }
 579     if(type != 1){  // not whole frame
 580         len2 = get_num(pb, &len);
 581         pos  = get_num(pb, &len);
 582         pic_num = get_byte(pb); len--;
 583     }
 584     if(len<0)
 585         return -1;
 586     rm->remaining_len = len;
 587     if(type&1){     // frame, not slice
 588         if(type == 3)  // frame as a part of packet
 589             len= len2;
 590         if(rm->remaining_len < len)
 591             return -1;
 592         rm->remaining_len -= len;
 593         if(av_new_packet(pkt, len + 9) < 0)
 594             return AVERROR(EIO);
 595         pkt->data[0] = 0;
 596         AV_WL32(pkt->data + 1, 1);
 597         AV_WL32(pkt->data + 5, 0);
 598         get_buffer(pb, pkt->data + 9, len);
 599         return 0;
 600     }
 601     //now we have to deal with single slice
 602
 603     *pseq = seq;
 604     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
 605         vst->slices = ((hdr & 0x3F) << 1) + 1;
 606         vst->videobufsize = len2 + 8*vst->slices + 1;
 607         av_free_packet(&vst->pkt); //FIXME this should be output.
 608         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
 609             return AVERROR(ENOMEM);
 610         vst->videobufpos = 8*vst->slices + 1;
 611         vst->cur_slice = 0;
 612         vst->curpic_num = pic_num;
 613         vst->pktpos = url_ftell(pb);
 614     }
 615     if(type == 2)
 616         len = FFMIN(len, pos);
 617
 618     if(++vst->cur_slice > vst->slices)
 619         return 1;
 620     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
 621     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
 622     if(vst->videobufpos + len > vst->videobufsize)
 623         return 1;
 624     if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
 625         return AVERROR(EIO);
 626     vst->videobufpos += len;
 627     rm->remaining_len-= len;
 628
 629     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
 630         vst->pkt.data[0] = vst->cur_slice-1;
 631         *pkt= vst->pkt;
 632         vst->pkt.data= NULL;
 633         vst->pkt.size= 0;
 634         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
 635             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
 636                 vst->videobufpos - 1 - 8*vst->slices);
 637         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
 638         pkt->pts = AV_NOPTS_VALUE;
 639         pkt->pos = vst->pktpos;
 640         vst->slices = 0;
 641         return 0;
 642     }
 643
 644     return 1;
 645 }
 646
 647 static inline void
 648 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
 649 {
 650     uint8_t *ptr;
 651     int j;
 652
 653     if (st->codec->codec_id == CODEC_ID_AC3) {
 654         ptr = pkt->data;
 655         for (j=0;j<pkt->size;j+=2) {
 656             FFSWAP(int, ptr[0], ptr[1]);
 657             ptr += 2;
 658         }
 659     }
 660 }
 661
 662 /**
 663  * Perform 4-bit block reordering for SIPR data.
 664  * @todo This can be optimized, e.g. use memcpy() if data blocks are aligned
 665  */
 666 static void
 667 rm_reorder_sipr_data (RMStream *ast)
 668 {
 669     int n, bs = ast->sub_packet_h * ast->audio_framesize * 2 / 96; // nibbles per subpacket
 670
 671     for (n = 0; n < 38; n++) {
 672         int j;
 673         int i = bs * sipr_swaps[n][0];
 674         int o = bs * sipr_swaps[n][1];
 675         uint8_t *buf = ast->pkt.data;
 676
 677         /* swap 4bit-nibbles of block 'i' with 'o' */
 678         for (j = 0; j < bs; j++, i++, o++) {
 679             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
 680                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
 681
 682             buf[o >> 1] = (x << (4 * (o & 1))) |
 683                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
 684             buf[i >> 1] = (y << (4 * (i & 1))) |
 685                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
 686         }
 687     }
 688 }
 689
 690 int
 691 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
 692                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
 693                     int *seq, int flags, int64_t timestamp)
 694 {
 695     RMDemuxContext *rm = s->priv_data;
 696
 697     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 698         rm->current_stream= st->id;
 699         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
 700             return -1; //got partial frame
 701     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 702         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
 703             (st->codec->codec_id == CODEC_ID_COOK) ||
 704             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
 705             (st->codec->codec_id == CODEC_ID_SIPR)) {
 706             int x;
 707             int sps = ast->sub_packet_size;
 708             int cfs = ast->coded_framesize;
 709             int h = ast->sub_packet_h;
 710             int y = ast->sub_packet_cnt;
 711             int w = ast->audio_framesize;
 712
 713             if (flags & 2)
 714                 y = ast->sub_packet_cnt = 0;
 715             if (!y)
 716                 ast->audiotimestamp = timestamp;
 717
 718             switch(st->codec->codec_id) {
 719                 case CODEC_ID_RA_288:
 720                     for (x = 0; x < h/2; x++)
 721                         get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
 722                     break;
 723                 case CODEC_ID_ATRAC3:
 724                 case CODEC_ID_COOK:
 725                     for (x = 0; x < w/sps; x++)
 726                         get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 727                     break;
 728                 case CODEC_ID_SIPR:
 729                     get_buffer(pb, ast->pkt.data + y * w, w);
 730                     break;
 731             }
 732
 733             if (++(ast->sub_packet_cnt) < h)
 734                 return -1;
 735             if (st->codec->codec_id == CODEC_ID_SIPR)
 736                 rm_reorder_sipr_data(ast);
 737
 738              ast->sub_packet_cnt = 0;
 739              rm->audio_stream_num = st->index;
 740              rm->audio_pkt_cnt = h * w / st->codec->block_align;
 741         } else if (st->codec->codec_id == CODEC_ID_AAC) {
 742             int x;
 743             rm->audio_stream_num = st->index;
 744             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
 745             if (ast->sub_packet_cnt) {
 746                 for (x = 0; x < ast->sub_packet_cnt; x++)
 747                     ast->sub_packet_lengths[x] = get_be16(pb);
 748                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
 749                 ast->audiotimestamp = timestamp;
 750             } else
 751                 return -1;
 752         } else {
 753             av_get_packet(pb, pkt, len);
 754             rm_ac3_swap_bytes(st, pkt);
 755         }
 756     } else
 757         av_get_packet(pb, pkt, len);
 758
 759     pkt->stream_index = st->index;
 760
 761 #if 0
 762     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 763         if(st->codec->codec_id == CODEC_ID_RV20){
 764             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 765             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
 766
 767             seq |= (timestamp&~0x3FFF);
 768             if(seq - timestamp >  0x2000) seq -= 0x4000;
 769             if(seq - timestamp < -0x2000) seq += 0x4000;
 770         }
 771     }
 772 #endif
 773
 774     pkt->pts= timestamp;
 775     if (flags & 2)
 776         pkt->flags |= PKT_FLAG_KEY;
 777
 778     return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
 779 }
 780
 781 int
 782 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
 783                       AVStream *st, RMStream *ast, AVPacket *pkt)
 784 {
 785     RMDemuxContext *rm = s->priv_data;
 786
 787     assert (rm->audio_pkt_cnt > 0);
 788
 789     if (st->codec->codec_id == CODEC_ID_AAC)
 790         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
 791     else {
 792         av_new_packet(pkt, st->codec->block_align);
 793         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
 794                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 795                st->codec->block_align);
 796     }
 797     rm->audio_pkt_cnt--;
 798     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
 799         ast->audiotimestamp = AV_NOPTS_VALUE;
 800         pkt->flags = PKT_FLAG_KEY;
 801     } else
 802         pkt->flags = 0;
 803     pkt->stream_index = st->index;
 804
 805     return rm->audio_pkt_cnt;
 806 }
 807
 808 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 809 {
 810     RMDemuxContext *rm = s->priv_data;
 811     AVStream *st;
 812     int i, len, res, seq = 1;
 813     int64_t timestamp, pos;
 814     int flags;
 815
 816     for (;;) {
 817         if (rm->audio_pkt_cnt) {
 818             // If there are queued audio packet return them first
 819             st = s->streams[rm->audio_stream_num];
 820             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
 821         } else {
 822             if (rm->old_format) {
 823                 RMStream *ast;
 824
 825                 st = s->streams[0];
 826                 ast = st->priv_data;
 827                 timestamp = AV_NOPTS_VALUE;
 828                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
 829                     ast->coded_framesize * ast->sub_packet_h / 2;
 830                 flags = (seq++ == 1) ? 2 : 0;
 831             } else {
 832                 len=sync(s, &timestamp, &flags, &i, &pos);
 833                 if (len > 0)
 834                     st = s->streams[i];
 835             }
 836
 837             if(len<0 || url_feof(s->pb))
 838                 return AVERROR(EIO);
 839
 840             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
 841                                       &seq, flags, timestamp);
 842             if((flags&2) && (seq&0x7F) == 1)
 843                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 844             if (res)
 845                 continue;
 846         }
 847
 848         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
 849            || st->discard >= AVDISCARD_ALL){
 850             av_free_packet(pkt);
 851         } else
 852             break;
 853     }
 854
 855     return 0;
 856 }
 857
 858 static int rm_read_close(AVFormatContext *s)
 859 {
 860     int i;
 861
 862     for (i=0;i<s->nb_streams;i++)
 863         ff_rm_free_rmstream(s->streams[i]->priv_data);
 864
 865     return 0;
 866 }
 867
 868 static int rm_probe(AVProbeData *p)
 869 {
 870     /* check file header */
 871     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 872          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 873          p->buf[4] == 0 && p->buf[5] == 0) ||
 874         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 875          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 876         return AVPROBE_SCORE_MAX;
 877     else
 878         return 0;
 879 }
 880
 881 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 882                                int64_t *ppos, int64_t pos_limit)
 883 {
 884     RMDemuxContext *rm = s->priv_data;
 885     int64_t pos, dts;
 886     int stream_index2, flags, len, h;
 887
 888     pos = *ppos;
 889
 890     if(rm->old_format)
 891         return AV_NOPTS_VALUE;
 892
 893     url_fseek(s->pb, pos, SEEK_SET);
 894     rm->remaining_len=0;
 895     for(;;){
 896         int seq=1;
 897         AVStream *st;
 898
 899         len=sync(s, &dts, &flags, &stream_index2, &pos);
 900         if(len<0)
 901             return AV_NOPTS_VALUE;
 902
 903         st = s->streams[stream_index2];
 904         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 905             h= get_byte(s->pb); len--;
 906             if(!(h & 0x40)){
 907                 seq = get_byte(s->pb); len--;
 908             }
 909         }
 910
 911         if((flags&2) && (seq&0x7F) == 1){
 912 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
 913             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 914             if(stream_index2 == stream_index)
 915                 break;
 916         }
 917
 918         url_fskip(s->pb, len);
 919     }
 920     *ppos = pos;
 921     return dts;
 922 }
 923
 924 AVInputFormat rm_demuxer = {
 925     "rm",
 926     NULL_IF_CONFIG_SMALL("RealMedia format"),
 927     sizeof(RMDemuxContext),
 928     rm_probe,
 929     rm_read_header,
 930     rm_read_packet,
 931     rm_read_close,
 932     NULL,
 933     rm_read_dts,
 934 };
 935
 936 AVInputFormat rdt_demuxer = {
 937     "rdt",
 938     NULL_IF_CONFIG_SMALL("RDT demuxer"),
 939     sizeof(RMDemuxContext),
 940     NULL,
 941     NULL,
 942     NULL,
 943     rm_read_close,
 944 };