libavformat/asf.c

   1 /*
   2  * ASF 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/common.h"
  23 #include "libavcodec/mpegaudio.h"
  24 #include "avformat.h"
  25 #include "riff.h"
  26 #include "asf.h"
  27 #include "asfcrypt.h"
  28
  29 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  30
  31 #undef NDEBUG
  32 #include <assert.h>
  33
  34 #define FRAME_HEADER_SIZE 17
  35 // Fix Me! FRAME_HEADER_SIZE may be different.
  36
  37 static const GUID index_guid = {
  38     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  39 };
  40
  41 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
  42     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  43 };
  44 /**********************************/
  45 /* decoding */
  46
  47 //#define DEBUG
  48
  49 #ifdef DEBUG
  50 #define PRINT_IF_GUID(g,cmp) \
  51 if (!memcmp(g, &cmp, sizeof(GUID))) \
  52     dprintf(NULL, "(GUID: %s) ", #cmp)
  53
  54 static void print_guid(const GUID *g)
  55 {
  56     int i;
  57     PRINT_IF_GUID(g, asf_header);
  58     else PRINT_IF_GUID(g, file_header);
  59     else PRINT_IF_GUID(g, stream_header);
  60     else PRINT_IF_GUID(g, audio_stream);
  61     else PRINT_IF_GUID(g, audio_conceal_none);
  62     else PRINT_IF_GUID(g, video_stream);
  63     else PRINT_IF_GUID(g, video_conceal_none);
  64     else PRINT_IF_GUID(g, command_stream);
  65     else PRINT_IF_GUID(g, comment_header);
  66     else PRINT_IF_GUID(g, codec_comment_header);
  67     else PRINT_IF_GUID(g, codec_comment1_header);
  68     else PRINT_IF_GUID(g, data_header);
  69     else PRINT_IF_GUID(g, index_guid);
  70     else PRINT_IF_GUID(g, head1_guid);
  71     else PRINT_IF_GUID(g, head2_guid);
  72     else PRINT_IF_GUID(g, my_guid);
  73     else PRINT_IF_GUID(g, ext_stream_header);
  74     else PRINT_IF_GUID(g, extended_content_header);
  75     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  76     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  77     else PRINT_IF_GUID(g, metadata_header);
  78     else PRINT_IF_GUID(g, stream_bitrate_guid);
  79     else
  80         dprintf(NULL, "(GUID: unknown) ");
  81     for(i=0;i<16;i++)
  82         dprintf(NULL, " 0x%02x,", (*g)[i]);
  83     dprintf(NULL, "}\n");
  84 }
  85 #undef PRINT_IF_GUID
  86 #else
  87 #define print_guid(g)
  88 #endif
  89
  90 static void get_guid(ByteIOContext *s, GUID *g)
  91 {
  92     assert(sizeof(*g) == 16);
  93     get_buffer(s, *g, sizeof(*g));
  94 }
  95
  96 #if 0
  97 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  98 {
  99     int len, c;
 100     char *q;
 101
 102     len = get_le16(pb);
 103     q = buf;
 104     while (len > 0) {
 105         c = get_le16(pb);
 106         if ((q - buf) < buf_size - 1)
 107             *q++ = c;
 108         len--;
 109     }
 110     *q = '\0';
 111 }
 112 #endif
 113
 114 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 115 {
 116     char* q = buf;
 117     len /= 2;
 118     while (len--) {
 119         uint8_t tmp;
 120         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 121     }
 122     *q = '\0';
 123 }
 124
 125 static int asf_probe(AVProbeData *pd)
 126 {
 127     /* check file header */
 128     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
 129         return AVPROBE_SCORE_MAX;
 130     else
 131         return 0;
 132 }
 133
 134 static int get_value(ByteIOContext *pb, int type){
 135     switch(type){
 136         case 2: return get_le32(pb);
 137         case 3: return get_le32(pb);
 138         case 4: return get_le64(pb);
 139         case 5: return get_le16(pb);
 140         default:return INT_MIN;
 141     }
 142 }
 143
 144 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 145 {
 146     ASFContext *asf = s->priv_data;
 147     GUID g;
 148     ByteIOContext *pb = s->pb;
 149     AVStream *st;
 150     ASFStream *asf_st;
 151     int size, i;
 152     int64_t gsize;
 153     AVRational dar[128];
 154     uint32_t bitrate[128];
 155
 156     memset(dar, 0, sizeof(dar));
 157     memset(bitrate, 0, sizeof(bitrate));
 158
 159     get_guid(pb, &g);
 160     if (memcmp(&g, &asf_header, sizeof(GUID)))
 161         return -1;
 162     get_le64(pb);
 163     get_le32(pb);
 164     get_byte(pb);
 165     get_byte(pb);
 166     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 167     for(;;) {
 168         get_guid(pb, &g);
 169         gsize = get_le64(pb);
 170         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
 171         print_guid(&g);
 172         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 173         if (!memcmp(&g, &data_header, sizeof(GUID))) {
 174             asf->data_object_offset = url_ftell(pb);
 175             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 176             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 177                 asf->data_object_size = gsize - 24;
 178             } else {
 179                 asf->data_object_size = (uint64_t)-1;
 180             }
 181             break;
 182         }
 183         if (gsize < 24)
 184             return -1;
 185         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 186             get_guid(pb, &asf->hdr.guid);
 187             asf->hdr.file_size          = get_le64(pb);
 188             asf->hdr.create_time        = get_le64(pb);
 189             asf->nb_packets             = get_le64(pb);
 190             asf->hdr.play_time          = get_le64(pb);
 191             asf->hdr.send_time          = get_le64(pb);
 192             asf->hdr.preroll            = get_le32(pb);
 193             asf->hdr.ignore             = get_le32(pb);
 194             asf->hdr.flags              = get_le32(pb);
 195             asf->hdr.min_pktsize        = get_le32(pb);
 196             asf->hdr.max_pktsize        = get_le32(pb);
 197             asf->hdr.max_bitrate        = get_le32(pb);
 198             asf->packet_size = asf->hdr.max_pktsize;
 199         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 200             enum CodecType type;
 201             int type_specific_size, sizeX;
 202             uint64_t total_size;
 203             unsigned int tag1;
 204             int64_t pos1, pos2, start_time;
 205             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 206
 207             pos1 = url_ftell(pb);
 208
 209             st = av_new_stream(s, 0);
 210             if (!st)
 211                 return AVERROR(ENOMEM);
 212             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 213             asf_st = av_mallocz(sizeof(ASFStream));
 214             if (!asf_st)
 215                 return AVERROR(ENOMEM);
 216             st->priv_data = asf_st;
 217             start_time = asf->hdr.preroll;
 218
 219             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 220                 st->duration = asf->hdr.send_time /
 221                     (10000000 / 1000) - start_time;
 222             }
 223             get_guid(pb, &g);
 224
 225             test_for_ext_stream_audio = 0;
 226             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 227                 type = CODEC_TYPE_AUDIO;
 228             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 229                 type = CODEC_TYPE_VIDEO;
 230             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 231                 type = CODEC_TYPE_DATA;
 232             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 233                 test_for_ext_stream_audio = 1;
 234                 type = CODEC_TYPE_UNKNOWN;
 235             } else {
 236                 return -1;
 237             }
 238             get_guid(pb, &g);
 239             total_size = get_le64(pb);
 240             type_specific_size = get_le32(pb);
 241             get_le32(pb);
 242             st->id = get_le16(pb) & 0x7f; /* stream id */
 243             // mapping of asf ID to AV stream ID;
 244             asf->asfid2avid[st->id] = s->nb_streams - 1;
 245
 246             get_le32(pb);
 247
 248             if (test_for_ext_stream_audio) {
 249                 get_guid(pb, &g);
 250                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 251                     type = CODEC_TYPE_AUDIO;
 252                     is_dvr_ms_audio=1;
 253                     get_guid(pb, &g);
 254                     get_le32(pb);
 255                     get_le32(pb);
 256                     get_le32(pb);
 257                     get_guid(pb, &g);
 258                     get_le32(pb);
 259                 }
 260             }
 261
 262             st->codec->codec_type = type;
 263             if (type == CODEC_TYPE_AUDIO) {
 264                 get_wav_header(pb, st->codec, type_specific_size);
 265                 if (is_dvr_ms_audio) {
 266                     // codec_id and codec_tag are unreliable in dvr_ms
 267                     // files. Set them later by probing stream.
 268                     st->codec->codec_id = CODEC_ID_PROBE;
 269                     st->codec->codec_tag = 0;
 270                 }
 271                 st->need_parsing = AVSTREAM_PARSE_FULL;
 272                 /* We have to init the frame size at some point .... */
 273                 pos2 = url_ftell(pb);
 274                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 275                     asf_st->ds_span = get_byte(pb);
 276                     asf_st->ds_packet_size = get_le16(pb);
 277                     asf_st->ds_chunk_size = get_le16(pb);
 278                     get_le16(pb); //ds_data_size
 279                     get_byte(pb); //ds_silence_data
 280                 }
 281                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 282                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 283                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 284                 if (asf_st->ds_span > 1) {
 285                     if (!asf_st->ds_chunk_size
 286                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 287                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 288                         asf_st->ds_span = 0; // disable descrambling
 289                 }
 290                 switch (st->codec->codec_id) {
 291                 case CODEC_ID_MP3:
 292                     st->codec->frame_size = MPA_FRAME_SIZE;
 293                     break;
 294                 case CODEC_ID_PCM_S16LE:
 295                 case CODEC_ID_PCM_S16BE:
 296                 case CODEC_ID_PCM_U16LE:
 297                 case CODEC_ID_PCM_U16BE:
 298                 case CODEC_ID_PCM_S8:
 299                 case CODEC_ID_PCM_U8:
 300                 case CODEC_ID_PCM_ALAW:
 301                 case CODEC_ID_PCM_MULAW:
 302                     st->codec->frame_size = 1;
 303                     break;
 304                 default:
 305                     /* This is probably wrong, but it prevents a crash later */
 306                     st->codec->frame_size = 1;
 307                     break;
 308                 }
 309             } else if (type == CODEC_TYPE_VIDEO) {
 310                 get_le32(pb);
 311                 get_le32(pb);
 312                 get_byte(pb);
 313                 size = get_le16(pb); /* size */
 314                 sizeX= get_le32(pb); /* size */
 315                 st->codec->width = get_le32(pb);
 316                 st->codec->height = get_le32(pb);
 317                 /* not available for asf */
 318                 get_le16(pb); /* panes */
 319                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 320                 tag1 = get_le32(pb);
 321                 url_fskip(pb, 20);
 322 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 323                 size= sizeX;
 324                 if (size > 40) {
 325                     st->codec->extradata_size = size - 40;
 326                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 327                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 328                 }
 329
 330         /* Extract palette from extradata if bpp <= 8 */
 331         /* This code assumes that extradata contains only palette */
 332         /* This is true for all paletted codecs implemented in ffmpeg */
 333         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 334             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 335 #ifdef WORDS_BIGENDIAN
 336             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 337                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 338 #else
 339             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 340                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 341 #endif
 342             st->codec->palctrl->palette_changed = 1;
 343         }
 344
 345                 st->codec->codec_tag = tag1;
 346                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 347                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 348                     st->need_parsing = AVSTREAM_PARSE_FULL;
 349             }
 350             pos2 = url_ftell(pb);
 351             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 352         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 353             int len1, len2, len3, len4, len5;
 354
 355             len1 = get_le16(pb);
 356             len2 = get_le16(pb);
 357             len3 = get_le16(pb);
 358             len4 = get_le16(pb);
 359             len5 = get_le16(pb);
 360             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
 361             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
 362             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 363             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
 364             url_fskip(pb, len5);
 365         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
 366             int stream_count = get_le16(pb);
 367             int j;
 368
 369 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
 370 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
 371             for(j = 0; j < stream_count; j++) {
 372                 int flags, bitrate, stream_id;
 373
 374                 flags= get_le16(pb);
 375                 bitrate= get_le32(pb);
 376                 stream_id= (flags & 0x7f);
 377 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 378                 asf->stream_bitrates[stream_id]= bitrate;
 379             }
 380        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 381                 int desc_count, i;
 382
 383                 desc_count = get_le16(pb);
 384                 for(i=0;i<desc_count;i++)
 385                 {
 386                         int name_len,value_type,value_len;
 387                         uint64_t value_num = 0;
 388                         char name[1024];
 389
 390                         name_len = get_le16(pb);
 391                         get_str16_nolen(pb, name_len, name, sizeof(name));
 392                         value_type = get_le16(pb);
 393                         value_len = get_le16(pb);
 394                         if (value_type <= 1) // unicode or byte
 395                         {
 396                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
 397                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
 398                                 else if(!strcmp(name,"WM/Year"      )) {
 399                                     char year[8];
 400                                     get_str16_nolen(pb, value_len, year, sizeof(year));
 401                                     s->year = atoi(year);
 402                                 }
 403                                 else if(!strcmp(name,"WM/Track") && s->track == 0) {
 404                                     char track[8];
 405                                     get_str16_nolen(pb, value_len, track, sizeof(track));
 406                                     s->track = strtol(track, NULL, 10) + 1;
 407                                 }
 408                                 else if(!strcmp(name,"WM/TrackNumber")) {
 409                                     char track[8];
 410                                     get_str16_nolen(pb, value_len, track, sizeof(track));
 411                                     s->track = strtol(track, NULL, 10);
 412                                 }
 413                                 else url_fskip(pb, value_len);
 414                         }
 415                         else if (value_type <= 5) // boolean or DWORD or QWORD or WORD
 416                         {
 417                                 value_num= get_value(pb, value_type);
 418                                 if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
 419                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
 420                         }else
 421                             url_fskip(pb, value_len);
 422                 }
 423         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
 424             int n, stream_num, name_len, value_len, value_type, value_num;
 425             n = get_le16(pb);
 426
 427             for(i=0;i<n;i++) {
 428                 char name[1024];
 429
 430                 get_le16(pb); //lang_list_index
 431                 stream_num= get_le16(pb);
 432                 name_len=   get_le16(pb);
 433                 value_type= get_le16(pb);
 434                 value_len=  get_le32(pb);
 435
 436                 get_str16_nolen(pb, name_len, name, sizeof(name));
 437 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 438                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 439                 url_fskip(pb, value_len - 2);
 440
 441                 if(stream_num<128){
 442                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 443                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 444                 }
 445             }
 446         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 447             int ext_len, payload_ext_ct, stream_ct;
 448             uint32_t ext_d, leak_rate, stream_num;
 449             int64_t pos_ex_st;
 450             pos_ex_st = url_ftell(pb);
 451
 452             get_le64(pb); // starttime
 453             get_le64(pb); // endtime
 454             leak_rate = get_le32(pb); // leak-datarate
 455             get_le32(pb); // bucket-datasize
 456             get_le32(pb); // init-bucket-fullness
 457             get_le32(pb); // alt-leak-datarate
 458             get_le32(pb); // alt-bucket-datasize
 459             get_le32(pb); // alt-init-bucket-fullness
 460             get_le32(pb); // max-object-size
 461             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 462             stream_num = get_le16(pb); // stream-num
 463             get_le16(pb); // stream-language-id-index
 464             get_le64(pb); // avg frametime in 100ns units
 465             stream_ct = get_le16(pb); //stream-name-count
 466             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 467
 468             if (stream_num < 128)
 469                 bitrate[stream_num] = leak_rate;
 470
 471             for (i=0; i<stream_ct; i++){
 472                 get_le16(pb);
 473                 ext_len = get_le16(pb);
 474                 url_fseek(pb, ext_len, SEEK_CUR);
 475             }
 476
 477             for (i=0; i<payload_ext_ct; i++){
 478                 get_guid(pb, &g);
 479                 ext_d=get_le16(pb);
 480                 ext_len=get_le32(pb);
 481                 url_fseek(pb, ext_len, SEEK_CUR);
 482             }
 483
 484             // there could be a optional stream properties object to follow
 485             // if so the next iteration will pick it up
 486         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 487             int v1, v2;
 488             get_guid(pb, &g);
 489             v1 = get_le32(pb);
 490             v2 = get_le16(pb);
 491 #if 0
 492         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 493             int len, v1, n, num;
 494             char str[256], *q;
 495             char tag[16];
 496
 497             get_guid(pb, &g);
 498             print_guid(&g);
 499
 500             n = get_le32(pb);
 501             for(i=0;i<n;i++) {
 502                 num = get_le16(pb); /* stream number */
 503                 get_str16(pb, str, sizeof(str));
 504                 get_str16(pb, str, sizeof(str));
 505                 len = get_le16(pb);
 506                 q = tag;
 507                 while (len > 0) {
 508                     v1 = get_byte(pb);
 509                     if ((q - tag) < sizeof(tag) - 1)
 510                         *q++ = v1;
 511                     len--;
 512                 }
 513                 *q = '\0';
 514             }
 515 #endif
 516         } else if (url_feof(pb)) {
 517             return -1;
 518         } else {
 519             url_fseek(pb, gsize - 24, SEEK_CUR);
 520         }
 521     }
 522     get_guid(pb, &g);
 523     get_le64(pb);
 524     get_byte(pb);
 525     get_byte(pb);
 526     if (url_feof(pb))
 527         return -1;
 528     asf->data_offset = url_ftell(pb);
 529     asf->packet_size_left = 0;
 530
 531
 532     for(i=0; i<128; i++){
 533         int stream_num= asf->asfid2avid[i];
 534         if(stream_num>=0){
 535             AVStream *st = s->streams[stream_num];
 536             if (!st->codec->bit_rate)
 537                 st->codec->bit_rate = bitrate[i];
 538             if (dar[i].num > 0 && dar[i].den > 0)
 539                 av_reduce(&st->sample_aspect_ratio.num,
 540                           &st->sample_aspect_ratio.den,
 541                           dar[i].num, dar[i].den, INT_MAX);
 542 //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
 543         }
 544     }
 545
 546     return 0;
 547 }
 548
 549 #define DO_2BITS(bits, var, defval) \
 550     switch (bits & 3) \
 551     { \
 552     case 3: var = get_le32(pb); rsize += 4; break; \
 553     case 2: var = get_le16(pb); rsize += 2; break; \
 554     case 1: var = get_byte(pb); rsize++; break; \
 555     default: var = defval; break; \
 556     }
 557
 558 /**
 559  *
 560  * @return <0 in case of an error
 561  */
 562 static int asf_get_packet(AVFormatContext *s)
 563 {
 564     ASFContext *asf = s->priv_data;
 565     ByteIOContext *pb = s->pb;
 566     uint32_t packet_length, padsize;
 567     int rsize = 8;
 568     int c, d, e, off;
 569
 570     off= (url_ftell(s->pb) - s->data_offset) % asf->packet_size + 3;
 571
 572     c=d=e=-1;
 573     while(off-- > 0){
 574         c=d; d=e;
 575         e= get_byte(pb);
 576         if(c == 0x82 && !d && !e)
 577             break;
 578     }
 579
 580     if (c != 0x82) {
 581         if (!url_feof(pb))
 582             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 583     }
 584     if ((c & 0x8f) == 0x82) {
 585         if (d || e) {
 586             if (!url_feof(pb))
 587                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 588             return -1;
 589         }
 590         c= get_byte(pb);
 591         d= get_byte(pb);
 592         rsize+=3;
 593     }else{
 594         url_fseek(pb, -1, SEEK_CUR); //FIXME
 595     }
 596
 597     asf->packet_flags    = c;
 598     asf->packet_property = d;
 599
 600     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 601     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 602     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 603
 604     //the following checks prevent overflows and infinite loops
 605     if(packet_length >= (1U<<29)){
 606         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 607         return -1;
 608     }
 609     if(padsize >= packet_length){
 610         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 611         return -1;
 612     }
 613
 614     asf->packet_timestamp = get_le32(pb);
 615     get_le16(pb); /* duration */
 616     // rsize has at least 11 bytes which have to be present
 617
 618     if (asf->packet_flags & 0x01) {
 619         asf->packet_segsizetype = get_byte(pb); rsize++;
 620         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 621     } else {
 622         asf->packet_segments = 1;
 623         asf->packet_segsizetype = 0x80;
 624     }
 625     asf->packet_size_left = packet_length - padsize - rsize;
 626     if (packet_length < asf->hdr.min_pktsize)
 627         padsize += asf->hdr.min_pktsize - packet_length;
 628     asf->packet_padsize = padsize;
 629     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 630     return 0;
 631 }
 632
 633 /**
 634  *
 635  * @return <0 if error
 636  */
 637 static int asf_read_frame_header(AVFormatContext *s){
 638     ASFContext *asf = s->priv_data;
 639     ByteIOContext *pb = s->pb;
 640     int rsize = 1;
 641     int num = get_byte(pb);
 642     int64_t ts0, ts1;
 643
 644     asf->packet_segments--;
 645     asf->packet_key_frame = num >> 7;
 646     asf->stream_index = asf->asfid2avid[num & 0x7f];
 647     // sequence should be ignored!
 648     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 649     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 650     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 651 //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);
 652     if (asf->packet_replic_size >= 8) {
 653         asf->packet_obj_size = get_le32(pb);
 654         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 655             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 656             return -1;
 657         }
 658         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 659         if(asf->packet_replic_size >= 8+38+4){
 660 //            for(i=0; i<asf->packet_replic_size-8; i++)
 661 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 662 //            av_log(s, AV_LOG_DEBUG, "\n");
 663             url_fskip(pb, 10);
 664             ts0= get_le64(pb);
 665             ts1= get_le64(pb);
 666             url_fskip(pb, 12);
 667             get_le32(pb);
 668             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 669             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 670             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 671         }else
 672             url_fskip(pb, asf->packet_replic_size - 8);
 673         rsize += asf->packet_replic_size; // FIXME - check validity
 674     } else if (asf->packet_replic_size==1){
 675         // multipacket - frag_offset is beginning timestamp
 676         asf->packet_time_start = asf->packet_frag_offset;
 677         asf->packet_frag_offset = 0;
 678         asf->packet_frag_timestamp = asf->packet_timestamp;
 679
 680         asf->packet_time_delta = get_byte(pb);
 681         rsize++;
 682     }else if(asf->packet_replic_size!=0){
 683         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 684         return -1;
 685     }
 686     if (asf->packet_flags & 0x01) {
 687         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 688         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 689             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 690             return -1;
 691         }
 692         //printf("Fragsize %d\n", asf->packet_frag_size);
 693     } else {
 694         asf->packet_frag_size = asf->packet_size_left - rsize;
 695         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 696     }
 697     if (asf->packet_replic_size == 1) {
 698         asf->packet_multi_size = asf->packet_frag_size;
 699         if (asf->packet_multi_size > asf->packet_size_left)
 700             return -1;
 701     }
 702     asf->packet_size_left -= rsize;
 703     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 704
 705     return 0;
 706 }
 707
 708 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 709 {
 710     ASFContext *asf = s->priv_data;
 711     ASFStream *asf_st = 0;
 712     ByteIOContext *pb = s->pb;
 713     //static int pc = 0;
 714     for (;;) {
 715         if(url_feof(pb))
 716             return AVERROR(EIO);
 717         if (asf->packet_size_left < FRAME_HEADER_SIZE
 718             || asf->packet_segments < 1) {
 719             //asf->packet_size_left <= asf->packet_padsize) {
 720             int ret = asf->packet_size_left + asf->packet_padsize;
 721             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 722             assert(ret>=0);
 723             /* fail safe */
 724             url_fskip(pb, ret);
 725
 726             asf->packet_pos= url_ftell(s->pb);
 727             if (asf->data_object_size != (uint64_t)-1 &&
 728                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 729                 return AVERROR(EIO); /* Do not exceed the size of the data object */
 730             ret = asf_get_packet(s);
 731             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 732             if (ret < 0)
 733                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 734             asf->packet_time_start = 0;
 735             continue;
 736         }
 737         if (asf->packet_time_start == 0) {
 738             if(asf_read_frame_header(s) < 0){
 739                 asf->packet_segments= 0;
 740                 continue;
 741             }
 742             if (asf->stream_index < 0
 743                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 744                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 745                 ) {
 746                 asf->packet_time_start = 0;
 747                 /* unhandled packet (should not happen) */
 748                 url_fskip(pb, asf->packet_frag_size);
 749                 asf->packet_size_left -= asf->packet_frag_size;
 750                 if(asf->stream_index < 0)
 751                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 752                 continue;
 753             }
 754             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 755         }
 756         asf_st = asf->asf_st;
 757
 758         if (asf->packet_replic_size == 1) {
 759             // frag_offset is here used as the beginning timestamp
 760             asf->packet_frag_timestamp = asf->packet_time_start;
 761             asf->packet_time_start += asf->packet_time_delta;
 762             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 763             asf->packet_size_left--;
 764             asf->packet_multi_size--;
 765             if (asf->packet_multi_size < asf->packet_obj_size)
 766             {
 767                 asf->packet_time_start = 0;
 768                 url_fskip(pb, asf->packet_multi_size);
 769                 asf->packet_size_left -= asf->packet_multi_size;
 770                 continue;
 771             }
 772             asf->packet_multi_size -= asf->packet_obj_size;
 773             //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);
 774         }
 775         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 776               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 777            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 778             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 779                 asf_st->frag_offset, asf->packet_frag_size,
 780                 asf->packet_obj_size, asf_st->pkt.size);
 781             asf->packet_obj_size= asf_st->pkt.size;
 782         }
 783
 784         if (   asf_st->pkt.size != asf->packet_obj_size
 785             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 786             if(asf_st->pkt.data){
 787                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 788                 asf_st->frag_offset = 0;
 789                 av_free_packet(&asf_st->pkt);
 790             }
 791             /* new packet */
 792             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 793             asf_st->seq = asf->packet_seq;
 794             asf_st->pkt.dts = asf->packet_frag_timestamp;
 795             asf_st->pkt.stream_index = asf->stream_index;
 796             asf_st->pkt.pos =
 797             asf_st->packet_pos= asf->packet_pos;
 798 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 799 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 800 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 801             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 802                 asf->packet_key_frame = 1;
 803             if (asf->packet_key_frame)
 804                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 805         }
 806
 807         /* read data */
 808         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 809         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 810         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 811         asf->packet_size_left -= asf->packet_frag_size;
 812         if (asf->packet_size_left < 0)
 813             continue;
 814
 815         if(   asf->packet_frag_offset >= asf_st->pkt.size
 816            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 817             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 818                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 819             continue;
 820         }
 821
 822         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 823                    asf->packet_frag_size);
 824         if (s->key && s->keylen == 20)
 825             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 826                             asf->packet_frag_size);
 827         asf_st->frag_offset += asf->packet_frag_size;
 828         /* test if whole packet is read */
 829         if (asf_st->frag_offset == asf_st->pkt.size) {
 830             //workaround for macroshit radio DVR-MS files
 831             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 832                && asf_st->pkt.size > 100){
 833                 int i;
 834                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 835                 if(i == asf_st->pkt.size){
 836                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 837                     asf_st->frag_offset = 0;
 838                     av_free_packet(&asf_st->pkt);
 839                     continue;
 840                 }
 841             }
 842
 843             /* return packet */
 844             if (asf_st->ds_span > 1) {
 845               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 846                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
 847               }else{
 848                 /* packet descrambling */
 849                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 850                 if (newdata) {
 851                     int offset = 0;
 852                     while (offset < asf_st->pkt.size) {
 853                         int off = offset / asf_st->ds_chunk_size;
 854                         int row = off / asf_st->ds_span;
 855                         int col = off % asf_st->ds_span;
 856                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 857                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 858
 859                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 860                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 861                         memcpy(newdata + offset,
 862                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 863                                asf_st->ds_chunk_size);
 864                         offset += asf_st->ds_chunk_size;
 865                     }
 866                     av_free(asf_st->pkt.data);
 867                     asf_st->pkt.data = newdata;
 868                 }
 869               }
 870             }
 871             asf_st->frag_offset = 0;
 872             *pkt= asf_st->pkt;
 873             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 874             asf_st->pkt.size = 0;
 875             asf_st->pkt.data = 0;
 876             break; // packet completed
 877         }
 878     }
 879     return 0;
 880 }
 881
 882 // Added to support seeking after packets have been read
 883 // If information is not reset, read_packet fails due to
 884 // leftover information from previous reads
 885 static void asf_reset_header(AVFormatContext *s)
 886 {
 887     ASFContext *asf = s->priv_data;
 888     ASFStream *asf_st;
 889     int i;
 890
 891     asf->packet_nb_frames = 0;
 892     asf->packet_size_left = 0;
 893     asf->packet_segments = 0;
 894     asf->packet_flags = 0;
 895     asf->packet_property = 0;
 896     asf->packet_timestamp = 0;
 897     asf->packet_segsizetype = 0;
 898     asf->packet_segments = 0;
 899     asf->packet_seq = 0;
 900     asf->packet_replic_size = 0;
 901     asf->packet_key_frame = 0;
 902     asf->packet_padsize = 0;
 903     asf->packet_frag_offset = 0;
 904     asf->packet_frag_size = 0;
 905     asf->packet_frag_timestamp = 0;
 906     asf->packet_multi_size = 0;
 907     asf->packet_obj_size = 0;
 908     asf->packet_time_delta = 0;
 909     asf->packet_time_start = 0;
 910
 911     for(i=0; i<s->nb_streams; i++){
 912         asf_st= s->streams[i]->priv_data;
 913         av_free_packet(&asf_st->pkt);
 914         asf_st->frag_offset=0;
 915         asf_st->seq=0;
 916     }
 917     asf->asf_st= NULL;
 918 }
 919
 920 static int asf_read_close(AVFormatContext *s)
 921 {
 922     int i;
 923
 924     asf_reset_header(s);
 925     for(i=0;i<s->nb_streams;i++) {
 926         AVStream *st = s->streams[i];
 927         av_free(st->codec->palctrl);
 928     }
 929     return 0;
 930 }
 931
 932 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 933 {
 934     ASFContext *asf = s->priv_data;
 935     AVPacket pkt1, *pkt = &pkt1;
 936     ASFStream *asf_st;
 937     int64_t pts;
 938     int64_t pos= *ppos;
 939     int i;
 940     int64_t start_pos[s->nb_streams];
 941
 942     for(i=0; i<s->nb_streams; i++){
 943         start_pos[i]= pos;
 944     }
 945
 946     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 947     *ppos= pos;
 948     url_fseek(s->pb, pos, SEEK_SET);
 949
 950 //printf("asf_read_pts\n");
 951     asf_reset_header(s);
 952     for(;;){
 953         if (av_read_frame(s, pkt) < 0){
 954             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 955             return AV_NOPTS_VALUE;
 956         }
 957
 958         pts= pkt->pts;
 959
 960         av_free_packet(pkt);
 961         if(pkt->flags&PKT_FLAG_KEY){
 962             i= pkt->stream_index;
 963
 964             asf_st= s->streams[i]->priv_data;
 965
 966 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 967             pos= asf_st->packet_pos;
 968
 969             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 970             start_pos[i]= asf_st->packet_pos + 1;
 971
 972             if(pkt->stream_index == stream_index)
 973                break;
 974         }
 975     }
 976
 977     *ppos= pos;
 978 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 979
 980     return pts;
 981 }
 982
 983 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 984 {
 985     GUID g;
 986     ASFContext *asf = s->priv_data;
 987     int64_t gsize, itime;
 988     int64_t pos, current_pos, index_pts;
 989     int i;
 990     int pct,ict;
 991
 992     current_pos = url_ftell(s->pb);
 993
 994     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 995     get_guid(s->pb, &g);
 996     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 997         gsize = get_le64(s->pb);
 998         get_guid(s->pb, &g);
 999         itime=get_le64(s->pb);
1000         pct=get_le32(s->pb);
1001         ict=get_le32(s->pb);
1002         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1003
1004         for (i=0;i<ict;i++){
1005             int pktnum=get_le32(s->pb);
1006             int pktct =get_le16(s->pb);
1007             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1008
1009             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1010             index_pts=av_rescale(itime, i, 10000);
1011
1012             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1013         }
1014         asf->index_read= 1;
1015     }
1016     url_fseek(s->pb, current_pos, SEEK_SET);
1017 }
1018
1019 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1020 {
1021     ASFContext *asf = s->priv_data;
1022     AVStream *st = s->streams[stream_index];
1023     int64_t pos;
1024     int index;
1025
1026     if (asf->packet_size <= 0)
1027         return -1;
1028
1029     /* Try using the protocol's read_seek if available */
1030     if(s->pb) {
1031         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1032         if(ret >= 0)
1033             asf_reset_header(s);
1034         if (ret != AVERROR(ENOSYS))
1035             return ret;
1036     }
1037
1038     if (!asf->index_read)
1039         asf_build_simple_index(s, stream_index);
1040
1041     if(!(asf->index_read && st->index_entries)){
1042         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1043             return -1;
1044     }else{
1045         index= av_index_search_timestamp(st, pts, flags);
1046         if(index<0)
1047             return -1;
1048
1049         /* find the position */
1050         pos = st->index_entries[index].pos;
1051         pts = st->index_entries[index].timestamp;
1052
1053     // various attempts to find key frame have failed so far
1054     //    asf_reset_header(s);
1055     //    url_fseek(s->pb, pos, SEEK_SET);
1056     //    key_pos = pos;
1057     //     for(i=0;i<16;i++){
1058     //         pos = url_ftell(s->pb);
1059     //         if (av_read_frame(s, &pkt) < 0){
1060     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1061     //             return -1;
1062     //         }
1063     //         asf_st = s->streams[stream_index]->priv_data;
1064     //         pos += st->parser->frame_offset;
1065     //
1066     //         if (pkt.size > b) {
1067     //             b = pkt.size;
1068     //             key_pos = pos;
1069     //         }
1070     //
1071     //         av_free_packet(&pkt);
1072     //     }
1073
1074         /* do the seek */
1075         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1076         url_fseek(s->pb, pos, SEEK_SET);
1077     }
1078     asf_reset_header(s);
1079     return 0;
1080 }
1081
1082 AVInputFormat asf_demuxer = {
1083     "asf",
1084     NULL_IF_CONFIG_SMALL("ASF format"),
1085     sizeof(ASFContext),
1086     asf_probe,
1087     asf_read_header,
1088     asf_read_packet,
1089     asf_read_close,
1090     asf_read_seek,
1091     asf_read_pts,
1092 };