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