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 #include "avformat.h"
  22 #include "riff.h"
  23 #include "mpegaudio.h"
  24 #include "asf.h"
  25 #include "common.h"
  26 #include "asfcrypt.h"
  27
  28 extern void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  29
  30 #undef NDEBUG
  31 #include <assert.h>
  32
  33 #define FRAME_HEADER_SIZE 17
  34 // Fix Me! FRAME_HEADER_SIZE may be different.
  35
  36 static const GUID index_guid = {
  37     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  38 };
  39
  40 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
  41     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  42 };
  43 /**********************************/
  44 /* decoding */
  45
  46 //#define DEBUG
  47
  48 #ifdef DEBUG
  49 #define PRINT_IF_GUID(g,cmp) \
  50 if (!memcmp(g, &cmp, sizeof(GUID))) \
  51     printf("(GUID: %s) ", #cmp)
  52
  53 static void print_guid(const GUID *g)
  54 {
  55     int i;
  56     PRINT_IF_GUID(g, asf_header);
  57     else PRINT_IF_GUID(g, file_header);
  58     else PRINT_IF_GUID(g, stream_header);
  59     else PRINT_IF_GUID(g, audio_stream);
  60     else PRINT_IF_GUID(g, audio_conceal_none);
  61     else PRINT_IF_GUID(g, video_stream);
  62     else PRINT_IF_GUID(g, video_conceal_none);
  63     else PRINT_IF_GUID(g, command_stream);
  64     else PRINT_IF_GUID(g, comment_header);
  65     else PRINT_IF_GUID(g, codec_comment_header);
  66     else PRINT_IF_GUID(g, codec_comment1_header);
  67     else PRINT_IF_GUID(g, data_header);
  68     else PRINT_IF_GUID(g, index_guid);
  69     else PRINT_IF_GUID(g, head1_guid);
  70     else PRINT_IF_GUID(g, head2_guid);
  71     else PRINT_IF_GUID(g, my_guid);
  72     else PRINT_IF_GUID(g, ext_stream_header);
  73     else PRINT_IF_GUID(g, extended_content_header);
  74     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  75     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  76     else PRINT_IF_GUID(g, metadata_header);
  77     else PRINT_IF_GUID(g, stream_bitrate_guid);
  78     else
  79         printf("(GUID: unknown) ");
  80     for(i=0;i<16;i++)
  81         printf(" 0x%02x,", (*g)[i]);
  82     printf("}\n");
  83 }
  84 #undef PRINT_IF_GUID
  85 #endif
  86
  87 static void get_guid(ByteIOContext *s, GUID *g)
  88 {
  89     assert(sizeof(*g) == 16);
  90     get_buffer(s, *g, sizeof(*g));
  91 }
  92
  93 #if 0
  94 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  95 {
  96     int len, c;
  97     char *q;
  98
  99     len = get_le16(pb);
 100     q = buf;
 101     while (len > 0) {
 102         c = get_le16(pb);
 103         if ((q - buf) < buf_size - 1)
 104             *q++ = c;
 105         len--;
 106     }
 107     *q = '\0';
 108 }
 109 #endif
 110
 111 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 112 {
 113     char* q = buf;
 114     len /= 2;
 115     while (len--) {
 116         uint8_t tmp;
 117         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 118     }
 119     *q = '\0';
 120 }
 121
 122 static int asf_probe(AVProbeData *pd)
 123 {
 124     /* check file header */
 125     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
 126         return AVPROBE_SCORE_MAX;
 127     else
 128         return 0;
 129 }
 130
 131 static int get_value(ByteIOContext *pb, int type){
 132     switch(type){
 133         case 2: return get_le32(pb);
 134         case 3: return get_le32(pb);
 135         case 4: return get_le64(pb);
 136         case 5: return get_le16(pb);
 137         default:return INT_MIN;
 138     }
 139 }
 140
 141 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 142 {
 143     ASFContext *asf = s->priv_data;
 144     GUID g;
 145     ByteIOContext *pb = s->pb;
 146     AVStream *st;
 147     ASFStream *asf_st;
 148     int size, i;
 149     int64_t gsize;
 150     AVRational dar[128];
 151     uint32_t bitrate[128];
 152
 153     memset(dar, 0, sizeof(dar));
 154     memset(bitrate, 0, sizeof(bitrate));
 155
 156     get_guid(pb, &g);
 157     if (memcmp(&g, &asf_header, sizeof(GUID)))
 158         goto fail;
 159     get_le64(pb);
 160     get_le32(pb);
 161     get_byte(pb);
 162     get_byte(pb);
 163     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 164     for(;;) {
 165         get_guid(pb, &g);
 166         gsize = get_le64(pb);
 167 #ifdef DEBUG
 168         printf("%08"PRIx64": ", url_ftell(pb) - 24);
 169         print_guid(&g);
 170         printf("  size=0x%"PRIx64"\n", gsize);
 171 #endif
 172         if (!memcmp(&g, &data_header, sizeof(GUID))) {
 173             asf->data_object_offset = url_ftell(pb);
 174             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 175             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 176                 asf->data_object_size = gsize - 24;
 177             } else {
 178                 asf->data_object_size = (uint64_t)-1;
 179             }
 180             break;
 181         }
 182         if (gsize < 24)
 183             goto fail;
 184         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 185             get_guid(pb, &asf->hdr.guid);
 186             asf->hdr.file_size          = get_le64(pb);
 187             asf->hdr.create_time        = get_le64(pb);
 188             asf->nb_packets             = get_le64(pb);
 189             asf->hdr.send_time          = get_le64(pb);
 190             asf->hdr.play_time          = get_le64(pb);
 191             asf->hdr.preroll            = get_le32(pb);
 192             asf->hdr.ignore             = get_le32(pb);
 193             asf->hdr.flags              = get_le32(pb);
 194             asf->hdr.min_pktsize        = get_le32(pb);
 195             asf->hdr.max_pktsize        = get_le32(pb);
 196             asf->hdr.max_bitrate        = get_le32(pb);
 197             asf->packet_size = asf->hdr.max_pktsize;
 198         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 199             int type, type_specific_size, sizeX;
 200             uint64_t total_size;
 201             unsigned int tag1;
 202             int64_t pos1, pos2, start_time;
 203             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 204
 205             pos1 = url_ftell(pb);
 206
 207             st = av_new_stream(s, 0);
 208             if (!st)
 209                 goto fail;
 210             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 211             asf_st = av_mallocz(sizeof(ASFStream));
 212             if (!asf_st)
 213                 goto fail;
 214             st->priv_data = asf_st;
 215             start_time = asf->hdr.preroll;
 216
 217             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 218                 st->duration = asf->hdr.send_time /
 219                     (10000000 / 1000) - start_time;
 220             }
 221             get_guid(pb, &g);
 222
 223             test_for_ext_stream_audio = 0;
 224             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 225                 type = CODEC_TYPE_AUDIO;
 226             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 227                 type = CODEC_TYPE_VIDEO;
 228             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 229                 type = CODEC_TYPE_UNKNOWN;
 230             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 231                 test_for_ext_stream_audio = 1;
 232                 type = CODEC_TYPE_UNKNOWN;
 233             } else {
 234                 goto fail;
 235             }
 236             get_guid(pb, &g);
 237             total_size = get_le64(pb);
 238             type_specific_size = get_le32(pb);
 239             get_le32(pb);
 240             st->id = get_le16(pb) & 0x7f; /* stream id */
 241             // mapping of asf ID to AV stream ID;
 242             asf->asfid2avid[st->id] = s->nb_streams - 1;
 243
 244             get_le32(pb);
 245
 246             if (test_for_ext_stream_audio) {
 247                 get_guid(pb, &g);
 248                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 249                     type = CODEC_TYPE_AUDIO;
 250                     is_dvr_ms_audio=1;
 251                     get_guid(pb, &g);
 252                     get_le32(pb);
 253                     get_le32(pb);
 254                     get_le32(pb);
 255                     get_guid(pb, &g);
 256                     get_le32(pb);
 257                 }
 258             }
 259
 260             st->codec->codec_type = type;
 261             if (type == CODEC_TYPE_AUDIO) {
 262                 get_wav_header(pb, st->codec, type_specific_size);
 263                 if (is_dvr_ms_audio) {
 264                     // codec_id and codec_tag are unreliable in dvr_ms
 265                     // files. Set them later by probing stream.
 266                     st->codec->codec_id = CODEC_ID_NONE;
 267                     st->codec->codec_tag = 0;
 268                 }
 269                 st->need_parsing = AVSTREAM_PARSE_FULL;
 270                 /* We have to init the frame size at some point .... */
 271                 pos2 = url_ftell(pb);
 272                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 273                     asf_st->ds_span = get_byte(pb);
 274                     asf_st->ds_packet_size = get_le16(pb);
 275                     asf_st->ds_chunk_size = get_le16(pb);
 276                     get_le16(pb); //ds_data_size
 277                     get_byte(pb); //ds_silence_data
 278                 }
 279                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 280                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 281                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 282                 if (asf_st->ds_span > 1) {
 283                     if (!asf_st->ds_chunk_size
 284                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 285                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 286                         asf_st->ds_span = 0; // disable descrambling
 287                 }
 288                 switch (st->codec->codec_id) {
 289                 case CODEC_ID_MP3:
 290                     st->codec->frame_size = MPA_FRAME_SIZE;
 291                     break;
 292                 case CODEC_ID_PCM_S16LE:
 293                 case CODEC_ID_PCM_S16BE:
 294                 case CODEC_ID_PCM_U16LE:
 295                 case CODEC_ID_PCM_U16BE:
 296                 case CODEC_ID_PCM_S8:
 297                 case CODEC_ID_PCM_U8:
 298                 case CODEC_ID_PCM_ALAW:
 299                 case CODEC_ID_PCM_MULAW:
 300                     st->codec->frame_size = 1;
 301                     break;
 302                 default:
 303                     /* This is probably wrong, but it prevents a crash later */
 304                     st->codec->frame_size = 1;
 305                     break;
 306                 }
 307             } else if (type == CODEC_TYPE_VIDEO) {
 308                 get_le32(pb);
 309                 get_le32(pb);
 310                 get_byte(pb);
 311                 size = get_le16(pb); /* size */
 312                 sizeX= get_le32(pb); /* size */
 313                 st->codec->width = get_le32(pb);
 314                 st->codec->height = get_le32(pb);
 315                 /* not available for asf */
 316                 get_le16(pb); /* panes */
 317                 st->codec->bits_per_sample = get_le16(pb); /* depth */
 318                 tag1 = get_le32(pb);
 319                 url_fskip(pb, 20);
 320 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 321                 size= sizeX;
 322                 if (size > 40) {
 323                     st->codec->extradata_size = size - 40;
 324                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 325                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 326                 }
 327
 328         /* Extract palette from extradata if bpp <= 8 */
 329         /* This code assumes that extradata contains only palette */
 330         /* This is true for all paletted codecs implemented in ffmpeg */
 331         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
 332             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 333 #ifdef WORDS_BIGENDIAN
 334             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 335                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 336 #else
 337             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 338                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 339 #endif
 340             st->codec->palctrl->palette_changed = 1;
 341         }
 342
 343                 st->codec->codec_tag = tag1;
 344                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 345                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 346                     st->need_parsing = AVSTREAM_PARSE_FULL;
 347             }
 348             pos2 = url_ftell(pb);
 349             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 350         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 351             int len1, len2, len3, len4, len5;
 352
 353             len1 = get_le16(pb);
 354             len2 = get_le16(pb);
 355             len3 = get_le16(pb);
 356             len4 = get_le16(pb);
 357             len5 = get_le16(pb);
 358             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
 359             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
 360             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 361             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
 362             url_fskip(pb, len5);
 363         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
 364             int stream_count = get_le16(pb);
 365             int j;
 366
 367 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
 368 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
 369             for(j = 0; j < stream_count; j++) {
 370                 int flags, bitrate, stream_id;
 371
 372                 flags= get_le16(pb);
 373                 bitrate= get_le32(pb);
 374                 stream_id= (flags & 0x7f);
 375 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 376                 asf->stream_bitrates[stream_id]= bitrate;
 377             }
 378        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 379                 int desc_count, i;
 380
 381                 desc_count = get_le16(pb);
 382                 for(i=0;i<desc_count;i++)
 383                 {
 384                         int name_len,value_type,value_len;
 385                         uint64_t value_num = 0;
 386                         char name[1024];
 387
 388                         name_len = get_le16(pb);
 389                         get_str16_nolen(pb, name_len, name, sizeof(name));
 390                         value_type = get_le16(pb);
 391                         value_len = get_le16(pb);
 392                         if (value_type <= 1) // unicode or byte
 393                         {
 394                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
 395                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
 396                                 else if(!strcmp(name,"WM/Year"      )) {
 397                                     char year[8];
 398                                     get_str16_nolen(pb, value_len, year, sizeof(year));
 399                                     s->year = atoi(year);
 400                                 }
 401                                 else if(!strcmp(name,"WM/Track") && s->track == 0) {
 402                                     char track[8];
 403                                     get_str16_nolen(pb, value_len, track, sizeof(track));
 404                                     s->track = strtol(track, NULL, 10) + 1;
 405                                 }
 406                                 else if(!strcmp(name,"WM/TrackNumber")) {
 407                                     char track[8];
 408                                     get_str16_nolen(pb, value_len, track, sizeof(track));
 409                                     s->track = strtol(track, NULL, 10);
 410                                 }
 411                                 else url_fskip(pb, value_len);
 412                         }
 413                         else if (value_type <= 5) // boolean or DWORD or QWORD or WORD
 414                         {
 415                                 value_num= get_value(pb, value_type);
 416                                 if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
 417                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
 418                         }else
 419                             url_fskip(pb, value_len);
 420                 }
 421         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
 422             int n, stream_num, name_len, value_len, value_type, value_num;
 423             n = get_le16(pb);
 424
 425             for(i=0;i<n;i++) {
 426                 char name[1024];
 427
 428                 get_le16(pb); //lang_list_index
 429                 stream_num= get_le16(pb);
 430                 name_len=   get_le16(pb);
 431                 value_type= get_le16(pb);
 432                 value_len=  get_le32(pb);
 433
 434                 get_str16_nolen(pb, name_len, name, sizeof(name));
 435 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 436                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 437                 url_fskip(pb, value_len - 2);
 438
 439                 if(stream_num<128){
 440                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 441                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 442                 }
 443             }
 444         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 445             int ext_len, payload_ext_ct, stream_ct;
 446             uint32_t ext_d, leak_rate, stream_num;
 447             int64_t pos_ex_st;
 448             pos_ex_st = url_ftell(pb);
 449
 450             get_le64(pb); // starttime
 451             get_le64(pb); // endtime
 452             leak_rate = get_le32(pb); // leak-datarate
 453             get_le32(pb); // bucket-datasize
 454             get_le32(pb); // init-bucket-fullness
 455             get_le32(pb); // alt-leak-datarate
 456             get_le32(pb); // alt-bucket-datasize
 457             get_le32(pb); // alt-init-bucket-fullness
 458             get_le32(pb); // max-object-size
 459             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 460             stream_num = get_le16(pb); // stream-num
 461             get_le16(pb); // stream-language-id-index
 462             get_le64(pb); // avg frametime in 100ns units
 463             stream_ct = get_le16(pb); //stream-name-count
 464             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 465
 466             if (stream_num < 128)
 467                 bitrate[stream_num] = leak_rate;
 468
 469             for (i=0; i<stream_ct; i++){
 470                 get_le16(pb);
 471                 ext_len = get_le16(pb);
 472                 url_fseek(pb, ext_len, SEEK_CUR);
 473             }
 474
 475             for (i=0; i<payload_ext_ct; i++){
 476                 get_guid(pb, &g);
 477                 ext_d=get_le16(pb);
 478                 ext_len=get_le32(pb);
 479                 url_fseek(pb, ext_len, SEEK_CUR);
 480             }
 481
 482             // there could be a optional stream properties object to follow
 483             // if so the next iteration will pick it up
 484         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 485             int v1, v2;
 486             get_guid(pb, &g);
 487             v1 = get_le32(pb);
 488             v2 = get_le16(pb);
 489 #if 0
 490         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 491             int len, v1, n, num;
 492             char str[256], *q;
 493             char tag[16];
 494
 495             get_guid(pb, &g);
 496             print_guid(&g);
 497
 498             n = get_le32(pb);
 499             for(i=0;i<n;i++) {
 500                 num = get_le16(pb); /* stream number */
 501                 get_str16(pb, str, sizeof(str));
 502                 get_str16(pb, str, sizeof(str));
 503                 len = get_le16(pb);
 504                 q = tag;
 505                 while (len > 0) {
 506                     v1 = get_byte(pb);
 507                     if ((q - tag) < sizeof(tag) - 1)
 508                         *q++ = v1;
 509                     len--;
 510                 }
 511                 *q = '\0';
 512             }
 513 #endif
 514         } else if (url_feof(pb)) {
 515             goto fail;
 516         } else {
 517             url_fseek(pb, gsize - 24, SEEK_CUR);
 518         }
 519     }
 520     get_guid(pb, &g);
 521     get_le64(pb);
 522     get_byte(pb);
 523     get_byte(pb);
 524     if (url_feof(pb))
 525         goto fail;
 526     asf->data_offset = url_ftell(pb);
 527     asf->packet_size_left = 0;
 528
 529
 530     for(i=0; i<128; i++){
 531         int stream_num= asf->asfid2avid[i];
 532         if(stream_num>=0){
 533             AVCodecContext *codec= s->streams[stream_num]->codec;
 534             if (!codec->bit_rate)
 535                 codec->bit_rate = bitrate[i];
 536             if (dar[i].num > 0 && dar[i].den > 0)
 537                 av_reduce(&codec->sample_aspect_ratio.num,
 538                           &codec->sample_aspect_ratio.den,
 539                           dar[i].num, dar[i].den, INT_MAX);
 540 //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
 541         }
 542     }
 543
 544     return 0;
 545
 546  fail:
 547      for(i=0;i<s->nb_streams;i++) {
 548         AVStream *st = s->streams[i];
 549         if (st) {
 550             av_free(st->priv_data);
 551             av_free(st->codec->extradata);
 552         }
 553         av_free(st);
 554     }
 555     return -1;
 556 }
 557
 558 #define DO_2BITS(bits, var, defval) \
 559     switch (bits & 3) \
 560     { \
 561     case 3: var = get_le32(pb); rsize += 4; break; \
 562     case 2: var = get_le16(pb); rsize += 2; break; \
 563     case 1: var = get_byte(pb); rsize++; break; \
 564     default: var = defval; break; \
 565     }
 566
 567 /**
 568  *
 569  * @return <0 in case of an error
 570  */
 571 static int asf_get_packet(AVFormatContext *s)
 572 {
 573     ASFContext *asf = s->priv_data;
 574     ByteIOContext *pb = s->pb;
 575     uint32_t packet_length, padsize;
 576     int rsize = 8;
 577     int c, d, e, off;
 578
 579     off= (url_ftell(s->pb) - s->data_offset) % asf->packet_size + 3;
 580
 581     c=d=e=-1;
 582     while(off-- > 0){
 583         c=d; d=e;
 584         e= get_byte(pb);
 585         if(c == 0x82 && !d && !e)
 586             break;
 587     }
 588
 589     if (c != 0x82) {
 590         if (!url_feof(pb))
 591             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 592     }
 593     if ((c & 0x8f) == 0x82) {
 594         if (d || e) {
 595             if (!url_feof(pb))
 596                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 597             return -1;
 598         }
 599         c= get_byte(pb);
 600         d= get_byte(pb);
 601         rsize+=3;
 602     }else{
 603         url_fseek(pb, -1, SEEK_CUR); //FIXME
 604     }
 605
 606     asf->packet_flags    = c;
 607     asf->packet_property = d;
 608
 609     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 610     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 611     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 612
 613     //the following checks prevent overflows and infinite loops
 614     if(packet_length >= (1U<<29)){
 615         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 616         return -1;
 617     }
 618     if(padsize >= packet_length){
 619         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 620         return -1;
 621     }
 622
 623     asf->packet_timestamp = get_le32(pb);
 624     get_le16(pb); /* duration */
 625     // rsize has at least 11 bytes which have to be present
 626
 627     if (asf->packet_flags & 0x01) {
 628         asf->packet_segsizetype = get_byte(pb); rsize++;
 629         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 630     } else {
 631         asf->packet_segments = 1;
 632         asf->packet_segsizetype = 0x80;
 633     }
 634     asf->packet_size_left = packet_length - padsize - rsize;
 635     if (packet_length < asf->hdr.min_pktsize)
 636         padsize += asf->hdr.min_pktsize - packet_length;
 637     asf->packet_padsize = padsize;
 638 #ifdef DEBUG
 639     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 640 #endif
 641     return 0;
 642 }
 643
 644 /**
 645  *
 646  * @return <0 if error
 647  */
 648 static int asf_read_frame_header(AVFormatContext *s){
 649     ASFContext *asf = s->priv_data;
 650     ByteIOContext *pb = s->pb;
 651     int rsize = 1;
 652     int num = get_byte(pb);
 653     int64_t ts0, ts1;
 654
 655     asf->packet_segments--;
 656     asf->packet_key_frame = num >> 7;
 657     asf->stream_index = asf->asfid2avid[num & 0x7f];
 658     // sequence should be ignored!
 659     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 660     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 661     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 662 //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);
 663     if (asf->packet_replic_size >= 8) {
 664         asf->packet_obj_size = get_le32(pb);
 665         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 666             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 667             return -1;
 668         }
 669         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 670         if(asf->packet_replic_size >= 8+38+4){
 671 //            for(i=0; i<asf->packet_replic_size-8; i++)
 672 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 673 //            av_log(s, AV_LOG_DEBUG, "\n");
 674             url_fskip(pb, 10);
 675             ts0= get_le64(pb);
 676             ts1= get_le64(pb);
 677             url_fskip(pb, 12);
 678             get_le32(pb);
 679             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 680             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 681             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 682         }else
 683             url_fskip(pb, asf->packet_replic_size - 8);
 684         rsize += asf->packet_replic_size; // FIXME - check validity
 685     } else if (asf->packet_replic_size==1){
 686         // multipacket - frag_offset is beginning timestamp
 687         asf->packet_time_start = asf->packet_frag_offset;
 688         asf->packet_frag_offset = 0;
 689         asf->packet_frag_timestamp = asf->packet_timestamp;
 690
 691         asf->packet_time_delta = get_byte(pb);
 692         rsize++;
 693     }else if(asf->packet_replic_size!=0){
 694         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 695         return -1;
 696     }
 697     if (asf->packet_flags & 0x01) {
 698         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 699         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 700             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 701             return -1;
 702         }
 703         //printf("Fragsize %d\n", asf->packet_frag_size);
 704     } else {
 705         asf->packet_frag_size = asf->packet_size_left - rsize;
 706         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 707     }
 708     if (asf->packet_replic_size == 1) {
 709         asf->packet_multi_size = asf->packet_frag_size;
 710         if (asf->packet_multi_size > asf->packet_size_left)
 711             return -1;
 712     }
 713     asf->packet_size_left -= rsize;
 714     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 715
 716     return 0;
 717 }
 718
 719 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 720 {
 721     ASFContext *asf = s->priv_data;
 722     ASFStream *asf_st = 0;
 723     ByteIOContext *pb = s->pb;
 724     //static int pc = 0;
 725     for (;;) {
 726         if(url_feof(pb))
 727             return AVERROR(EIO);
 728         if (asf->packet_size_left < FRAME_HEADER_SIZE
 729             || asf->packet_segments < 1) {
 730             //asf->packet_size_left <= asf->packet_padsize) {
 731             int ret = asf->packet_size_left + asf->packet_padsize;
 732             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 733             assert(ret>=0);
 734             /* fail safe */
 735             url_fskip(pb, ret);
 736
 737             asf->packet_pos= url_ftell(s->pb);
 738             if (asf->data_object_size != (uint64_t)-1 &&
 739                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 740                 return AVERROR(EIO); /* Do not exceed the size of the data object */
 741             ret = asf_get_packet(s);
 742             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 743             if (ret < 0)
 744                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 745             asf->packet_time_start = 0;
 746             continue;
 747         }
 748         if (asf->packet_time_start == 0) {
 749             if(asf_read_frame_header(s) < 0){
 750                 asf->packet_segments= 0;
 751                 continue;
 752             }
 753             if (asf->stream_index < 0
 754                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 755                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 756                 ) {
 757                 asf->packet_time_start = 0;
 758                 /* unhandled packet (should not happen) */
 759                 url_fskip(pb, asf->packet_frag_size);
 760                 asf->packet_size_left -= asf->packet_frag_size;
 761                 if(asf->stream_index < 0)
 762                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 763                 continue;
 764             }
 765             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 766         }
 767         asf_st = asf->asf_st;
 768
 769         if (asf->packet_replic_size == 1) {
 770             // frag_offset is here used as the beginning timestamp
 771             asf->packet_frag_timestamp = asf->packet_time_start;
 772             asf->packet_time_start += asf->packet_time_delta;
 773             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 774             asf->packet_size_left--;
 775             asf->packet_multi_size--;
 776             if (asf->packet_multi_size < asf->packet_obj_size)
 777             {
 778                 asf->packet_time_start = 0;
 779                 url_fskip(pb, asf->packet_multi_size);
 780                 asf->packet_size_left -= asf->packet_multi_size;
 781                 continue;
 782             }
 783             asf->packet_multi_size -= asf->packet_obj_size;
 784             //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);
 785         }
 786         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 787               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 788            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 789             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 790                 asf_st->frag_offset, asf->packet_frag_size,
 791                 asf->packet_obj_size, asf_st->pkt.size);
 792             asf->packet_obj_size= asf_st->pkt.size;
 793         }
 794
 795         if (   asf_st->pkt.size != asf->packet_obj_size
 796             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 797             if(asf_st->pkt.data){
 798                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 799                 asf_st->frag_offset = 0;
 800                 av_free_packet(&asf_st->pkt);
 801             }
 802             /* new packet */
 803             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 804             asf_st->seq = asf->packet_seq;
 805             asf_st->pkt.pts = asf->packet_frag_timestamp;
 806             asf_st->pkt.stream_index = asf->stream_index;
 807             asf_st->pkt.pos =
 808             asf_st->packet_pos= asf->packet_pos;
 809 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 810 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 811 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 812             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 813                 asf->packet_key_frame = 1;
 814             if (asf->packet_key_frame)
 815                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 816         }
 817
 818         /* read data */
 819         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 820         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 821         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 822         asf->packet_size_left -= asf->packet_frag_size;
 823         if (asf->packet_size_left < 0)
 824             continue;
 825
 826         if(   asf->packet_frag_offset >= asf_st->pkt.size
 827            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 828             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 829                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 830             continue;
 831         }
 832
 833         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 834                    asf->packet_frag_size);
 835         if (s->key && s->keylen == 20)
 836             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 837                             asf->packet_frag_size);
 838         asf_st->frag_offset += asf->packet_frag_size;
 839         /* test if whole packet is read */
 840         if (asf_st->frag_offset == asf_st->pkt.size) {
 841             //workaround for macroshit radio DVR-MS files
 842             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 843                && asf_st->pkt.size > 100){
 844                 int i;
 845                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 846                 if(i == asf_st->pkt.size){
 847                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 848                     asf_st->frag_offset = 0;
 849                     av_free_packet(&asf_st->pkt);
 850                     continue;
 851                 }
 852             }
 853
 854             /* return packet */
 855             if (asf_st->ds_span > 1) {
 856               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 857                     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);
 858               }else{
 859                 /* packet descrambling */
 860                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 861                 if (newdata) {
 862                     int offset = 0;
 863                     while (offset < asf_st->pkt.size) {
 864                         int off = offset / asf_st->ds_chunk_size;
 865                         int row = off / asf_st->ds_span;
 866                         int col = off % asf_st->ds_span;
 867                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 868                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 869
 870                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 871                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 872                         memcpy(newdata + offset,
 873                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 874                                asf_st->ds_chunk_size);
 875                         offset += asf_st->ds_chunk_size;
 876                     }
 877                     av_free(asf_st->pkt.data);
 878                     asf_st->pkt.data = newdata;
 879                 }
 880               }
 881             }
 882             asf_st->frag_offset = 0;
 883             *pkt= asf_st->pkt;
 884             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 885             asf_st->pkt.size = 0;
 886             asf_st->pkt.data = 0;
 887             break; // packet completed
 888         }
 889     }
 890     return 0;
 891 }
 892
 893 // Added to support seeking after packets have been read
 894 // If information is not reset, read_packet fails due to
 895 // leftover information from previous reads
 896 static void asf_reset_header(AVFormatContext *s)
 897 {
 898     ASFContext *asf = s->priv_data;
 899     ASFStream *asf_st;
 900     int i;
 901
 902     asf->packet_nb_frames = 0;
 903     asf->packet_size_left = 0;
 904     asf->packet_segments = 0;
 905     asf->packet_flags = 0;
 906     asf->packet_property = 0;
 907     asf->packet_timestamp = 0;
 908     asf->packet_segsizetype = 0;
 909     asf->packet_segments = 0;
 910     asf->packet_seq = 0;
 911     asf->packet_replic_size = 0;
 912     asf->packet_key_frame = 0;
 913     asf->packet_padsize = 0;
 914     asf->packet_frag_offset = 0;
 915     asf->packet_frag_size = 0;
 916     asf->packet_frag_timestamp = 0;
 917     asf->packet_multi_size = 0;
 918     asf->packet_obj_size = 0;
 919     asf->packet_time_delta = 0;
 920     asf->packet_time_start = 0;
 921
 922     for(i=0; i<s->nb_streams; i++){
 923         asf_st= s->streams[i]->priv_data;
 924         av_free_packet(&asf_st->pkt);
 925         asf_st->frag_offset=0;
 926         asf_st->seq=0;
 927     }
 928     asf->asf_st= NULL;
 929 }
 930
 931 static int asf_read_close(AVFormatContext *s)
 932 {
 933     int i;
 934
 935     asf_reset_header(s);
 936     for(i=0;i<s->nb_streams;i++) {
 937         AVStream *st = s->streams[i];
 938         av_free(st->priv_data);
 939         av_free(st->codec->palctrl);
 940     }
 941     return 0;
 942 }
 943
 944 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 945 {
 946     ASFContext *asf = s->priv_data;
 947     AVPacket pkt1, *pkt = &pkt1;
 948     ASFStream *asf_st;
 949     int64_t pts;
 950     int64_t pos= *ppos;
 951     int i;
 952     int64_t start_pos[s->nb_streams];
 953
 954     for(i=0; i<s->nb_streams; i++){
 955         start_pos[i]= pos;
 956     }
 957
 958     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 959     *ppos= pos;
 960     url_fseek(s->pb, pos, SEEK_SET);
 961
 962 //printf("asf_read_pts\n");
 963     asf_reset_header(s);
 964     for(;;){
 965         if (av_read_frame(s, pkt) < 0){
 966             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 967             return AV_NOPTS_VALUE;
 968         }
 969
 970         pts= pkt->pts;
 971
 972         av_free_packet(pkt);
 973         if(pkt->flags&PKT_FLAG_KEY){
 974             i= pkt->stream_index;
 975
 976             asf_st= s->streams[i]->priv_data;
 977
 978 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 979             pos= asf_st->packet_pos;
 980
 981             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 982             start_pos[i]= asf_st->packet_pos + 1;
 983
 984             if(pkt->stream_index == stream_index)
 985                break;
 986         }
 987     }
 988
 989     *ppos= pos;
 990 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 991
 992     return pts;
 993 }
 994
 995 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 996 {
 997     GUID g;
 998     ASFContext *asf = s->priv_data;
 999     int64_t gsize, itime;
1000     int64_t pos, current_pos, index_pts;
1001     int i;
1002     int pct,ict;
1003
1004     current_pos = url_ftell(s->pb);
1005
1006     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1007     get_guid(s->pb, &g);
1008     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
1009         gsize = get_le64(s->pb);
1010         get_guid(s->pb, &g);
1011         itime=get_le64(s->pb);
1012         pct=get_le32(s->pb);
1013         ict=get_le32(s->pb);
1014         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1015
1016         for (i=0;i<ict;i++){
1017             int pktnum=get_le32(s->pb);
1018             int pktct =get_le16(s->pb);
1019             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1020
1021             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1022             index_pts=av_rescale(itime, i, 10000);
1023
1024             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1025         }
1026         asf->index_read= 1;
1027     }
1028     url_fseek(s->pb, current_pos, SEEK_SET);
1029 }
1030
1031 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1032 {
1033     ASFContext *asf = s->priv_data;
1034     AVStream *st = s->streams[stream_index];
1035     int64_t pos;
1036     int index;
1037
1038     if (asf->packet_size <= 0)
1039         return -1;
1040
1041     /* Try using the protocol's read_seek if available */
1042     if(s->pb) {
1043         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1044         if(ret >= 0)
1045             asf_reset_header(s);
1046         if (ret != AVERROR(ENOSYS))
1047             return ret;
1048     }
1049
1050     if (!asf->index_read)
1051         asf_build_simple_index(s, stream_index);
1052
1053     if(!(asf->index_read && st->index_entries)){
1054         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1055             return -1;
1056     }else{
1057         index= av_index_search_timestamp(st, pts, flags);
1058         if(index<0)
1059             return -1;
1060
1061         /* find the position */
1062         pos = st->index_entries[index].pos;
1063         pts = st->index_entries[index].timestamp;
1064
1065     // various attempts to find key frame have failed so far
1066     //    asf_reset_header(s);
1067     //    url_fseek(s->pb, pos, SEEK_SET);
1068     //    key_pos = pos;
1069     //     for(i=0;i<16;i++){
1070     //         pos = url_ftell(s->pb);
1071     //         if (av_read_frame(s, &pkt) < 0){
1072     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1073     //             return -1;
1074     //         }
1075     //         asf_st = s->streams[stream_index]->priv_data;
1076     //         pos += st->parser->frame_offset;
1077     //
1078     //         if (pkt.size > b) {
1079     //             b = pkt.size;
1080     //             key_pos = pos;
1081     //         }
1082     //
1083     //         av_free_packet(&pkt);
1084     //     }
1085
1086         /* do the seek */
1087         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1088         url_fseek(s->pb, pos, SEEK_SET);
1089     }
1090     asf_reset_header(s);
1091     return 0;
1092 }
1093
1094 AVInputFormat asf_demuxer = {
1095     "asf",
1096     "asf format",
1097     sizeof(ASFContext),
1098     asf_probe,
1099     asf_read_header,
1100     asf_read_packet,
1101     asf_read_close,
1102     asf_read_seek,
1103     asf_read_pts,
1104 };