git.sesse.net Git - ffmpeg/blob - libavformat/asf.c

   1 /*
   2  * ASF compatible decoder.
   3  * Copyright (c) 2000, 2001 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19 #include "avformat.h"
  20 #include "riff.h"
  21 #include "mpegaudio.h"
  22 #include "asf.h"
  23
  24 #undef NDEBUG
  25 #include <assert.h>
  26
  27 #define FRAME_HEADER_SIZE 17
  28 // Fix Me! FRAME_HEADER_SIZE may be different.
  29
  30 static const GUID index_guid = {
  31     0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
  32 };
  33
  34 /**********************************/
  35 /* decoding */
  36
  37 //#define DEBUG
  38
  39 #ifdef DEBUG
  40 #define PRINT_IF_GUID(g,cmp) \
  41 if (!memcmp(g, &cmp, sizeof(GUID))) \
  42     printf("(GUID: %s) ", #cmp)
  43
  44 static void print_guid(const GUID *g)
  45 {
  46     int i;
  47     PRINT_IF_GUID(g, asf_header);
  48     else PRINT_IF_GUID(g, file_header);
  49     else PRINT_IF_GUID(g, stream_header);
  50     else PRINT_IF_GUID(g, audio_stream);
  51     else PRINT_IF_GUID(g, audio_conceal_none);
  52     else PRINT_IF_GUID(g, video_stream);
  53     else PRINT_IF_GUID(g, video_conceal_none);
  54     else PRINT_IF_GUID(g, command_stream);
  55     else PRINT_IF_GUID(g, comment_header);
  56     else PRINT_IF_GUID(g, codec_comment_header);
  57     else PRINT_IF_GUID(g, codec_comment1_header);
  58     else PRINT_IF_GUID(g, data_header);
  59     else PRINT_IF_GUID(g, index_guid);
  60     else PRINT_IF_GUID(g, head1_guid);
  61     else PRINT_IF_GUID(g, head2_guid);
  62     else PRINT_IF_GUID(g, my_guid);
  63     else PRINT_IF_GUID(g, ext_stream_header);
  64     else PRINT_IF_GUID(g, extended_content_header);
  65     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  66     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  67     else
  68         printf("(GUID: unknown) ");
  69     printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
  70     for(i=0;i<8;i++)
  71         printf(" 0x%02x,", g->v4[i]);
  72     printf("}\n");
  73 }
  74 #undef PRINT_IF_GUID
  75 #endif
  76
  77 static void get_guid(ByteIOContext *s, GUID *g)
  78 {
  79     int i;
  80
  81     g->v1 = get_le32(s);
  82     g->v2 = get_le16(s);
  83     g->v3 = get_le16(s);
  84     for(i=0;i<8;i++)
  85         g->v4[i] = get_byte(s);
  86 }
  87
  88 #if 0
  89 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  90 {
  91     int len, c;
  92     char *q;
  93
  94     len = get_le16(pb);
  95     q = buf;
  96     while (len > 0) {
  97         c = get_le16(pb);
  98         if ((q - buf) < buf_size - 1)
  99             *q++ = c;
 100         len--;
 101     }
 102     *q = '\0';
 103 }
 104 #endif
 105
 106 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 107 {
 108     int c;
 109     char *q;
 110
 111     q = buf;
 112     while (len > 0) {
 113         c = get_le16(pb);
 114         if ((q - buf) < buf_size - 1)
 115             *q++ = c;
 116         len-=2;
 117     }
 118     *q = '\0';
 119 }
 120
 121 static int asf_probe(AVProbeData *pd)
 122 {
 123     GUID g;
 124     const unsigned char *p;
 125     int i;
 126
 127     /* check file header */
 128     if (pd->buf_size <= 32)
 129         return 0;
 130     p = pd->buf;
 131     g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
 132     p += 4;
 133     g.v2 = p[0] | (p[1] << 8);
 134     p += 2;
 135     g.v3 = p[0] | (p[1] << 8);
 136     p += 2;
 137     for(i=0;i<8;i++)
 138         g.v4[i] = *p++;
 139
 140     if (!memcmp(&g, &asf_header, sizeof(GUID)))
 141         return AVPROBE_SCORE_MAX;
 142     else
 143         return 0;
 144 }
 145
 146 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 147 {
 148     ASFContext *asf = s->priv_data;
 149     GUID g;
 150     ByteIOContext *pb = &s->pb;
 151     AVStream *st;
 152     ASFStream *asf_st;
 153     int size, i;
 154     int64_t gsize;
 155
 156     get_guid(pb, &g);
 157     if (memcmp(&g, &asf_header, sizeof(GUID)))
 158         goto fail;
 159     get_le64(pb);
 160     get_le32(pb);
 161     get_byte(pb);
 162     get_byte(pb);
 163     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 164     for(;;) {
 165         get_guid(pb, &g);
 166         gsize = get_le64(pb);
 167 #ifdef DEBUG
 168         printf("%08Lx: ", url_ftell(pb) - 24);
 169         print_guid(&g);
 170         printf("  size=0x%Lx\n", gsize);
 171 #endif
 172         if (gsize < 24)
 173             goto fail;
 174         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 175             get_guid(pb, &asf->hdr.guid);
 176             asf->hdr.file_size          = get_le64(pb);
 177             asf->hdr.create_time        = get_le64(pb);
 178             asf->hdr.packets_count      = get_le64(pb);
 179             asf->hdr.send_time          = get_le64(pb);
 180             asf->hdr.play_time          = get_le64(pb);
 181             asf->hdr.preroll            = get_le32(pb);
 182             asf->hdr.ignore             = get_le32(pb);
 183             asf->hdr.flags              = get_le32(pb);
 184             asf->hdr.min_pktsize        = get_le32(pb);
 185             asf->hdr.max_pktsize        = get_le32(pb);
 186             asf->hdr.max_bitrate        = get_le32(pb);
 187             asf->packet_size = asf->hdr.max_pktsize;
 188             asf->nb_packets = asf->hdr.packets_count;
 189         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 190             int type, type_specific_size, sizeX;
 191             uint64_t total_size;
 192             unsigned int tag1;
 193             int64_t pos1, pos2;
 194             int test_for_ext_stream_audio;
 195
 196             pos1 = url_ftell(pb);
 197
 198             st = av_new_stream(s, 0);
 199             if (!st)
 200                 goto fail;
 201             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 202             asf_st = av_mallocz(sizeof(ASFStream));
 203             if (!asf_st)
 204                 goto fail;
 205             st->priv_data = asf_st;
 206             st->start_time = asf->hdr.preroll;
 207             st->duration = asf->hdr.send_time /
 208                 (10000000 / 1000) - st->start_time;
 209             get_guid(pb, &g);
 210
 211             test_for_ext_stream_audio = 0;
 212             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 213                 type = CODEC_TYPE_AUDIO;
 214             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 215                 type = CODEC_TYPE_VIDEO;
 216             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 217                 type = CODEC_TYPE_UNKNOWN;
 218             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 219                 test_for_ext_stream_audio = 1;
 220                 type = CODEC_TYPE_UNKNOWN;
 221             } else {
 222                 goto fail;
 223             }
 224             get_guid(pb, &g);
 225             total_size = get_le64(pb);
 226             type_specific_size = get_le32(pb);
 227             get_le32(pb);
 228             st->id = get_le16(pb) & 0x7f; /* stream id */
 229             // mapping of asf ID to AV stream ID;
 230             asf->asfid2avid[st->id] = s->nb_streams - 1;
 231
 232             get_le32(pb);
 233
 234             if (test_for_ext_stream_audio) {
 235                 get_guid(pb, &g);
 236                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 237                     type = CODEC_TYPE_AUDIO;
 238                     get_guid(pb, &g);
 239                     get_le32(pb);
 240                     get_le32(pb);
 241                     get_le32(pb);
 242                     get_guid(pb, &g);
 243                     get_le32(pb);
 244                 }
 245             }
 246
 247             st->codec->codec_type = type;
 248             if (type == CODEC_TYPE_AUDIO) {
 249                 get_wav_header(pb, st->codec, type_specific_size);
 250                 st->need_parsing = 1;
 251                 /* We have to init the frame size at some point .... */
 252                 pos2 = url_ftell(pb);
 253                 if (gsize > (pos2 + 8 - pos1 + 24)) {
 254                     asf_st->ds_span = get_byte(pb);
 255                     asf_st->ds_packet_size = get_le16(pb);
 256                     asf_st->ds_chunk_size = get_le16(pb);
 257                     asf_st->ds_data_size = get_le16(pb);
 258                     asf_st->ds_silence_data = get_byte(pb);
 259                 }
 260                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 261                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 262                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 263                 if (asf_st->ds_span > 1) {
 264                     if (!asf_st->ds_chunk_size
 265                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
 266                         asf_st->ds_span = 0; // disable descrambling
 267                 }
 268                 switch (st->codec->codec_id) {
 269                 case CODEC_ID_MP3:
 270                     st->codec->frame_size = MPA_FRAME_SIZE;
 271                     break;
 272                 case CODEC_ID_PCM_S16LE:
 273                 case CODEC_ID_PCM_S16BE:
 274                 case CODEC_ID_PCM_U16LE:
 275                 case CODEC_ID_PCM_U16BE:
 276                 case CODEC_ID_PCM_S8:
 277                 case CODEC_ID_PCM_U8:
 278                 case CODEC_ID_PCM_ALAW:
 279                 case CODEC_ID_PCM_MULAW:
 280                     st->codec->frame_size = 1;
 281                     break;
 282                 default:
 283                     /* This is probably wrong, but it prevents a crash later */
 284                     st->codec->frame_size = 1;
 285                     break;
 286                 }
 287             } else if (type == CODEC_TYPE_VIDEO) {
 288                 get_le32(pb);
 289                 get_le32(pb);
 290                 get_byte(pb);
 291                 size = get_le16(pb); /* size */
 292                 sizeX= get_le32(pb); /* size */
 293                 st->codec->width = get_le32(pb);
 294                 st->codec->height = get_le32(pb);
 295                 /* not available for asf */
 296                 get_le16(pb); /* panes */
 297                 st->codec->bits_per_sample = get_le16(pb); /* depth */
 298                 tag1 = get_le32(pb);
 299                 url_fskip(pb, 20);
 300 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 301                 size= sizeX;
 302                 if (size > 40) {
 303                     st->codec->extradata_size = size - 40;
 304                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 305                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 306                 }
 307
 308         /* Extract palette from extradata if bpp <= 8 */
 309         /* This code assumes that extradata contains only palette */
 310         /* This is true for all paletted codecs implemented in ffmpeg */
 311         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
 312             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 313 #ifdef WORDS_BIGENDIAN
 314             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 315                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 316 #else
 317             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 318                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 319 #endif
 320             st->codec->palctrl->palette_changed = 1;
 321         }
 322
 323                 st->codec->codec_tag = tag1;
 324                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 325                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 326                     st->need_parsing = 1;
 327             }
 328             pos2 = url_ftell(pb);
 329             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 330         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
 331             asf->data_object_offset = url_ftell(pb);
 332             if (gsize != (uint64_t)-1 && gsize >= 24) {
 333                 asf->data_object_size = gsize - 24;
 334             } else {
 335                 asf->data_object_size = (uint64_t)-1;
 336             }
 337             break;
 338         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 339             int len1, len2, len3, len4, len5;
 340
 341             len1 = get_le16(pb);
 342             len2 = get_le16(pb);
 343             len3 = get_le16(pb);
 344             len4 = get_le16(pb);
 345             len5 = get_le16(pb);
 346             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
 347             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
 348             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 349             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
 350             url_fskip(pb, len5);
 351        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 352                 int desc_count, i;
 353
 354                 desc_count = get_le16(pb);
 355                 for(i=0;i<desc_count;i++)
 356                 {
 357                         int name_len,value_type,value_len,value_num = 0;
 358                         char *name, *value;
 359
 360                         name_len = get_le16(pb);
 361                         name = (char *)av_mallocz(name_len);
 362                         get_str16_nolen(pb, name_len, name, name_len);
 363                         value_type = get_le16(pb);
 364                         value_len = get_le16(pb);
 365                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 366                         {
 367                                 value = (char *)av_mallocz(value_len);
 368                                 get_str16_nolen(pb, value_len, value, value_len);
 369                                 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
 370                                 av_free(value);
 371                         }
 372                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 373                         {
 374                                 if (value_type==2) value_num = get_le32(pb);
 375                                 if (value_type==3) value_num = get_le32(pb);
 376                                 if (value_type==4) value_num = get_le64(pb);
 377                                 if (value_type==5) value_num = get_le16(pb);
 378                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
 379                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
 380                         }
 381                         av_free(name);
 382                 }
 383         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 384             int ext_len, payload_ext_ct, stream_ct;
 385             uint32_t ext_d;
 386             int64_t pos_ex_st;
 387             pos_ex_st = url_ftell(pb);
 388
 389             get_le64(pb);
 390             get_le64(pb);
 391             get_le32(pb);
 392             get_le32(pb);
 393             get_le32(pb);
 394             get_le32(pb);
 395             get_le32(pb);
 396             get_le32(pb);
 397             get_le32(pb);
 398             get_le32(pb);
 399             get_le16(pb);
 400             get_le16(pb);
 401             get_le64(pb);
 402             stream_ct = get_le16(pb);
 403             payload_ext_ct = get_le16(pb);
 404
 405             for (i=0; i<stream_ct; i++){
 406                 get_le16(pb);
 407                 ext_len = get_le16(pb);
 408                 url_fseek(pb, ext_len, SEEK_CUR);
 409             }
 410
 411             for (i=0; i<payload_ext_ct; i++){
 412                 get_guid(pb, &g);
 413                 ext_d=get_le16(pb);
 414                 ext_len=get_le32(pb);
 415                 url_fseek(pb, ext_len, SEEK_CUR);
 416             }
 417
 418             // there could be a optional stream properties object to follow
 419             // if so the next iteration will pick it up
 420         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 421             int v1, v2;
 422             get_guid(pb, &g);
 423             v1 = get_le32(pb);
 424             v2 = get_le16(pb);
 425 #if 0
 426         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 427             int len, v1, n, num;
 428             char str[256], *q;
 429             char tag[16];
 430
 431             get_guid(pb, &g);
 432             print_guid(&g);
 433
 434             n = get_le32(pb);
 435             for(i=0;i<n;i++) {
 436                 num = get_le16(pb); /* stream number */
 437                 get_str16(pb, str, sizeof(str));
 438                 get_str16(pb, str, sizeof(str));
 439                 len = get_le16(pb);
 440                 q = tag;
 441                 while (len > 0) {
 442                     v1 = get_byte(pb);
 443                     if ((q - tag) < sizeof(tag) - 1)
 444                         *q++ = v1;
 445                     len--;
 446                 }
 447                 *q = '\0';
 448             }
 449 #endif
 450         } else if (url_feof(pb)) {
 451             goto fail;
 452         } else {
 453             url_fseek(pb, gsize - 24, SEEK_CUR);
 454         }
 455     }
 456     get_guid(pb, &g);
 457     get_le64(pb);
 458     get_byte(pb);
 459     get_byte(pb);
 460     if (url_feof(pb))
 461         goto fail;
 462     asf->data_offset = url_ftell(pb);
 463     asf->packet_size_left = 0;
 464
 465     return 0;
 466
 467  fail:
 468      for(i=0;i<s->nb_streams;i++) {
 469         AVStream *st = s->streams[i];
 470         if (st) {
 471             av_free(st->priv_data);
 472             av_free(st->codec->extradata);
 473         }
 474         av_free(st);
 475     }
 476     return -1;
 477 }
 478
 479 #define DO_2BITS(bits, var, defval) \
 480     switch (bits & 3) \
 481     { \
 482     case 3: var = get_le32(pb); rsize += 4; break; \
 483     case 2: var = get_le16(pb); rsize += 2; break; \
 484     case 1: var = get_byte(pb); rsize++; break; \
 485     default: var = defval; break; \
 486     }
 487
 488 static int asf_get_packet(AVFormatContext *s)
 489 {
 490     ASFContext *asf = s->priv_data;
 491     ByteIOContext *pb = &s->pb;
 492     uint32_t packet_length, padsize;
 493     int rsize = 9;
 494     int c;
 495
 496     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
 497
 498     c = get_byte(pb);
 499     if (c != 0x82) {
 500         if (!url_feof(pb))
 501             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 502     }
 503     if ((c & 0x0f) == 2) { // always true for now
 504         if (get_le16(pb) != 0) {
 505             if (!url_feof(pb))
 506                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 507             return AVERROR_IO;
 508         }
 509         rsize+=2;
 510 /*    }else{
 511         if (!url_feof(pb))
 512             printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
 513         return AVERROR_IO;*/
 514     }
 515
 516     asf->packet_flags = get_byte(pb);
 517     asf->packet_property = get_byte(pb);
 518
 519     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 520     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 521     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 522
 523     asf->packet_timestamp = get_le32(pb);
 524     get_le16(pb); /* duration */
 525     // rsize has at least 11 bytes which have to be present
 526
 527     if (asf->packet_flags & 0x01) {
 528         asf->packet_segsizetype = get_byte(pb); rsize++;
 529         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 530     } else {
 531         asf->packet_segments = 1;
 532         asf->packet_segsizetype = 0x80;
 533     }
 534     asf->packet_size_left = packet_length - padsize - rsize;
 535     if (packet_length < asf->hdr.min_pktsize)
 536         padsize += asf->hdr.min_pktsize - packet_length;
 537     asf->packet_padsize = padsize;
 538 #ifdef DEBUG
 539     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 540 #endif
 541     return 0;
 542 }
 543
 544 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 545 {
 546     ASFContext *asf = s->priv_data;
 547     ASFStream *asf_st = 0;
 548     ByteIOContext *pb = &s->pb;
 549     //static int pc = 0;
 550     for (;;) {
 551         int rsize = 0;
 552         if (asf->packet_size_left < FRAME_HEADER_SIZE
 553             || asf->packet_segments < 1) {
 554             //asf->packet_size_left <= asf->packet_padsize) {
 555             int ret = asf->packet_size_left + asf->packet_padsize;
 556             //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 557             if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
 558                 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
 559             /* fail safe */
 560             url_fskip(pb, ret);
 561             asf->packet_pos= url_ftell(&s->pb);
 562             if (asf->data_object_size != (uint64_t)-1 &&
 563                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 564                 return AVERROR_IO; /* Do not exceed the size of the data object */
 565             ret = asf_get_packet(s);
 566             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 567             if (ret < 0 || url_feof(pb))
 568                 return AVERROR_IO;
 569             asf->packet_time_start = 0;
 570             continue;
 571         }
 572         if (asf->packet_time_start == 0) {
 573             /* read frame header */
 574             int num = get_byte(pb);
 575             asf->packet_segments--;
 576             rsize++;
 577             asf->packet_key_frame = (num & 0x80) >> 7;
 578             asf->stream_index = asf->asfid2avid[num & 0x7f];
 579             // sequence should be ignored!
 580             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 581             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 582             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 583 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
 584             if (asf->packet_replic_size > 1) {
 585                 assert(asf->packet_replic_size >= 8);
 586                 // it should be always at least 8 bytes - FIXME validate
 587                 asf->packet_obj_size = get_le32(pb);
 588                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
 589                 if (asf->packet_replic_size > 8)
 590                     url_fskip(pb, asf->packet_replic_size - 8);
 591                 rsize += asf->packet_replic_size; // FIXME - check validity
 592             } else if (asf->packet_replic_size==1){
 593                 // multipacket - frag_offset is begining timestamp
 594                 asf->packet_time_start = asf->packet_frag_offset;
 595                 asf->packet_frag_offset = 0;
 596                 asf->packet_frag_timestamp = asf->packet_timestamp;
 597
 598                 asf->packet_time_delta = get_byte(pb);
 599                 rsize++;
 600             }else{
 601                 assert(asf->packet_replic_size==0);
 602             }
 603             if (asf->packet_flags & 0x01) {
 604                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 605 #undef DO_2BITS
 606                 //printf("Fragsize %d\n", asf->packet_frag_size);
 607             } else {
 608                 asf->packet_frag_size = asf->packet_size_left - rsize;
 609                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 610             }
 611             if (asf->packet_replic_size == 1) {
 612                 asf->packet_multi_size = asf->packet_frag_size;
 613                 if (asf->packet_multi_size > asf->packet_size_left) {
 614                     asf->packet_segments = 0;
 615                     continue;
 616                 }
 617             }
 618             asf->packet_size_left -= rsize;
 619             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 620
 621             if (asf->stream_index < 0
 622                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 623                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 624                 ) {
 625                 asf->packet_time_start = 0;
 626                 /* unhandled packet (should not happen) */
 627                 url_fskip(pb, asf->packet_frag_size);
 628                 asf->packet_size_left -= asf->packet_frag_size;
 629                 if(asf->stream_index < 0)
 630                     av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
 631                 continue;
 632             }
 633             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 634         }
 635         asf_st = asf->asf_st;
 636
 637         if ((asf->packet_frag_offset != asf_st->frag_offset
 638              || (asf->packet_frag_offset
 639                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
 640            ) {
 641             /* cannot continue current packet: free it */
 642             // FIXME better check if packet was already allocated
 643             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
 644                    asf_st->pkt.size,
 645                    asf->packet_obj_size,
 646                    asf->packet_frag_offset, asf_st->frag_offset,
 647                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
 648             if (asf_st->pkt.size)
 649                 av_free_packet(&asf_st->pkt);
 650             asf_st->frag_offset = 0;
 651             if (asf->packet_frag_offset != 0) {
 652                 url_fskip(pb, asf->packet_frag_size);
 653                 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
 654                 asf->packet_size_left -= asf->packet_frag_size;
 655                 continue;
 656             }
 657         }
 658         if (asf->packet_replic_size == 1) {
 659             // frag_offset is here used as the begining timestamp
 660             asf->packet_frag_timestamp = asf->packet_time_start;
 661             asf->packet_time_start += asf->packet_time_delta;
 662             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 663             asf->packet_size_left--;
 664             asf->packet_multi_size--;
 665             if (asf->packet_multi_size < asf->packet_obj_size)
 666             {
 667                 asf->packet_time_start = 0;
 668                 url_fskip(pb, asf->packet_multi_size);
 669                 asf->packet_size_left -= asf->packet_multi_size;
 670                 continue;
 671             }
 672             asf->packet_multi_size -= asf->packet_obj_size;
 673             //printf("COMPRESS size  %d  %d  %d   ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
 674         }
 675         if (asf_st->frag_offset == 0) {
 676             /* new packet */
 677             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 678             asf_st->seq = asf->packet_seq;
 679             asf_st->pkt.pts = asf->packet_frag_timestamp;
 680             asf_st->pkt.stream_index = asf->stream_index;
 681             asf_st->pkt.pos =
 682             asf_st->packet_pos= asf->packet_pos;
 683 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 684 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 685 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 686             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 687                 asf->packet_key_frame = 1;
 688             if (asf->packet_key_frame)
 689                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 690         }
 691
 692         /* read data */
 693         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 694         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 695         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 696         asf->packet_size_left -= asf->packet_frag_size;
 697         if (asf->packet_size_left < 0)
 698             continue;
 699         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 700                    asf->packet_frag_size);
 701         asf_st->frag_offset += asf->packet_frag_size;
 702         /* test if whole packet is read */
 703         if (asf_st->frag_offset == asf_st->pkt.size) {
 704             /* return packet */
 705             if (asf_st->ds_span > 1) {
 706                 /* packet descrambling */
 707                 char* newdata = av_malloc(asf_st->pkt.size);
 708                 if (newdata) {
 709                     int offset = 0;
 710                     while (offset < asf_st->pkt.size) {
 711                         int off = offset / asf_st->ds_chunk_size;
 712                         int row = off / asf_st->ds_span;
 713                         int col = off % asf_st->ds_span;
 714                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 715                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 716                         memcpy(newdata + offset,
 717                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 718                                asf_st->ds_chunk_size);
 719                         offset += asf_st->ds_chunk_size;
 720                     }
 721                     av_free(asf_st->pkt.data);
 722                     asf_st->pkt.data = newdata;
 723                 }
 724             }
 725             asf_st->frag_offset = 0;
 726             memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
 727             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 728             asf_st->pkt.size = 0;
 729             asf_st->pkt.data = 0;
 730             break; // packet completed
 731         }
 732     }
 733     return 0;
 734 }
 735
 736 static int asf_read_close(AVFormatContext *s)
 737 {
 738     int i;
 739
 740     for(i=0;i<s->nb_streams;i++) {
 741         AVStream *st = s->streams[i];
 742         av_free(st->priv_data);
 743     av_free(st->codec->palctrl);
 744     }
 745     return 0;
 746 }
 747
 748 // Added to support seeking after packets have been read
 749 // If information is not reset, read_packet fails due to
 750 // leftover information from previous reads
 751 static void asf_reset_header(AVFormatContext *s)
 752 {
 753     ASFContext *asf = s->priv_data;
 754     ASFStream *asf_st;
 755     int i;
 756
 757     asf->packet_nb_frames = 0;
 758     asf->packet_timestamp_start = -1;
 759     asf->packet_timestamp_end = -1;
 760     asf->packet_size_left = 0;
 761     asf->packet_segments = 0;
 762     asf->packet_flags = 0;
 763     asf->packet_property = 0;
 764     asf->packet_timestamp = 0;
 765     asf->packet_segsizetype = 0;
 766     asf->packet_segments = 0;
 767     asf->packet_seq = 0;
 768     asf->packet_replic_size = 0;
 769     asf->packet_key_frame = 0;
 770     asf->packet_padsize = 0;
 771     asf->packet_frag_offset = 0;
 772     asf->packet_frag_size = 0;
 773     asf->packet_frag_timestamp = 0;
 774     asf->packet_multi_size = 0;
 775     asf->packet_obj_size = 0;
 776     asf->packet_time_delta = 0;
 777     asf->packet_time_start = 0;
 778
 779     for(i=0; i<s->nb_streams; i++){
 780         asf_st= s->streams[i]->priv_data;
 781         av_free_packet(&asf_st->pkt);
 782         asf_st->frag_offset=0;
 783         asf_st->seq=0;
 784     }
 785     asf->asf_st= NULL;
 786 }
 787
 788 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 789 {
 790     ASFContext *asf = s->priv_data;
 791     AVPacket pkt1, *pkt = &pkt1;
 792     ASFStream *asf_st;
 793     int64_t pts;
 794     int64_t pos= *ppos;
 795     int i;
 796     int64_t start_pos[s->nb_streams];
 797
 798     for(i=0; i<s->nb_streams; i++){
 799         start_pos[i]= pos;
 800     }
 801
 802     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 803     *ppos= pos;
 804     url_fseek(&s->pb, pos, SEEK_SET);
 805
 806 //printf("asf_read_pts\n");
 807     asf_reset_header(s);
 808     for(;;){
 809         if (av_read_frame(s, pkt) < 0){
 810             av_log(s, AV_LOG_INFO, "seek failed\n");
 811             return AV_NOPTS_VALUE;
 812         }
 813
 814         pts= pkt->pts;
 815
 816         av_free_packet(pkt);
 817         if(pkt->flags&PKT_FLAG_KEY){
 818             i= pkt->stream_index;
 819
 820             asf_st= s->streams[i]->priv_data;
 821
 822             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 823             pos= asf_st->packet_pos;
 824
 825             av_add_index_entry(s->streams[i], pos, pkt->size, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 826             start_pos[i]= asf_st->packet_pos + 1;
 827
 828             if(pkt->stream_index == stream_index)
 829                break;
 830         }
 831     }
 832
 833     *ppos= pos;
 834 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
 835
 836     return pts;
 837 }
 838
 839 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 840 {
 841     ASFContext *asf = s->priv_data;
 842
 843     if (asf->packet_size <= 0)
 844         return -1;
 845
 846     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
 847         return -1;
 848
 849     asf_reset_header(s);
 850     return 0;
 851 }
 852
 853 AVInputFormat asf_demuxer = {
 854     "asf",
 855     "asf format",
 856     sizeof(ASFContext),
 857     asf_probe,
 858     asf_read_header,
 859     asf_read_packet,
 860     asf_read_close,
 861     asf_read_seek,
 862     asf_read_pts,
 863 };