libavformat/asfdec.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 "libavutil/avstring.h"
  24 #include "libavcodec/mpegaudio.h"
  25 #include "avformat.h"
  26 #include "riff.h"
  27 #include "asf.h"
  28 #include "asfcrypt.h"
  29 #include "avlanguage.h"
  30
  31 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  32
  33 #undef NDEBUG
  34 #include <assert.h>
  35
  36 #define FRAME_HEADER_SIZE 17
  37 // Fix Me! FRAME_HEADER_SIZE may be different.
  38
  39 static const ff_asf_guid index_guid = {
  40     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  41 };
  42
  43 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
  44     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  45 };
  46 /**********************************/
  47 /* decoding */
  48
  49 //#define DEBUG
  50
  51 #ifdef DEBUG
  52 #define PRINT_IF_GUID(g,cmp) \
  53 if (!guidcmp(g, &cmp)) \
  54     dprintf(NULL, "(GUID: %s) ", #cmp)
  55
  56 static void print_guid(const ff_asf_guid *g)
  57 {
  58     int i;
  59     PRINT_IF_GUID(g, ff_asf_header);
  60     else PRINT_IF_GUID(g, ff_asf_file_header);
  61     else PRINT_IF_GUID(g, ff_asf_stream_header);
  62     else PRINT_IF_GUID(g, ff_asf_audio_stream);
  63     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
  64     else PRINT_IF_GUID(g, ff_asf_video_stream);
  65     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
  66     else PRINT_IF_GUID(g, ff_asf_command_stream);
  67     else PRINT_IF_GUID(g, ff_asf_comment_header);
  68     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
  69     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
  70     else PRINT_IF_GUID(g, ff_asf_data_header);
  71     else PRINT_IF_GUID(g, index_guid);
  72     else PRINT_IF_GUID(g, ff_asf_head1_guid);
  73     else PRINT_IF_GUID(g, ff_asf_head2_guid);
  74     else PRINT_IF_GUID(g, ff_asf_my_guid);
  75     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
  76     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
  77     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
  78     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
  79     else PRINT_IF_GUID(g, ff_asf_metadata_header);
  80     else PRINT_IF_GUID(g, stream_bitrate_guid);
  81     else PRINT_IF_GUID(g, ff_asf_language_guid);
  82     else
  83         dprintf(NULL, "(GUID: unknown) ");
  84     for(i=0;i<16;i++)
  85         dprintf(NULL, " 0x%02x,", (*g)[i]);
  86     dprintf(NULL, "}\n");
  87 }
  88 #undef PRINT_IF_GUID
  89 #else
  90 #define print_guid(g)
  91 #endif
  92
  93 static int guidcmp(const void *g1, const void *g2)
  94 {
  95     return memcmp(g1, g2, sizeof(ff_asf_guid));
  96 }
  97
  98 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
  99 {
 100     assert(sizeof(*g) == 16);
 101     get_buffer(s, *g, sizeof(*g));
 102 }
 103
 104 #if 0
 105 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
 106 {
 107     int len, c;
 108     char *q;
 109
 110     len = get_le16(pb);
 111     q = buf;
 112     while (len > 0) {
 113         c = get_le16(pb);
 114         if ((q - buf) < buf_size - 1)
 115             *q++ = c;
 116         len--;
 117     }
 118     *q = '\0';
 119 }
 120 #endif
 121
 122 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 123 {
 124     char* q = buf;
 125     len /= 2;
 126     while (len--) {
 127         uint8_t tmp;
 128         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 129     }
 130     *q = '\0';
 131 }
 132
 133 static int asf_probe(AVProbeData *pd)
 134 {
 135     /* check file header */
 136     if (!guidcmp(pd->buf, &ff_asf_header))
 137         return AVPROBE_SCORE_MAX;
 138     else
 139         return 0;
 140 }
 141
 142 static int get_value(ByteIOContext *pb, int type){
 143     switch(type){
 144         case 2: return get_le32(pb);
 145         case 3: return get_le32(pb);
 146         case 4: return get_le64(pb);
 147         case 5: return get_le16(pb);
 148         default:return INT_MIN;
 149     }
 150 }
 151
 152 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 153 {
 154     char value[1024];
 155     if (type <= 1) {         // unicode or byte
 156         get_str16_nolen(s->pb, len, value, sizeof(value));
 157     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
 158         uint64_t num = get_value(s->pb, type);
 159         snprintf(value, sizeof(value), "%"PRIu64, num);
 160     } else {
 161         url_fskip(s->pb, len);
 162         return;
 163     }
 164     if (!strncmp(key, "WM/", 3))
 165         key += 3;
 166     av_metadata_set(&s->metadata, key, value);
 167 }
 168
 169 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 170 {
 171     ASFContext *asf = s->priv_data;
 172     ff_asf_guid g;
 173     ByteIOContext *pb = s->pb;
 174     AVStream *st;
 175     ASFStream *asf_st;
 176     int size, i;
 177     int64_t gsize;
 178     AVRational dar[128];
 179     uint32_t bitrate[128];
 180
 181     memset(dar, 0, sizeof(dar));
 182     memset(bitrate, 0, sizeof(bitrate));
 183
 184     get_guid(pb, &g);
 185     if (guidcmp(&g, &ff_asf_header))
 186         return -1;
 187     get_le64(pb);
 188     get_le32(pb);
 189     get_byte(pb);
 190     get_byte(pb);
 191     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 192     for(;;) {
 193         get_guid(pb, &g);
 194         gsize = get_le64(pb);
 195         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
 196         print_guid(&g);
 197         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 198         if (!guidcmp(&g, &ff_asf_data_header)) {
 199             asf->data_object_offset = url_ftell(pb);
 200             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 201             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 202                 asf->data_object_size = gsize - 24;
 203             } else {
 204                 asf->data_object_size = (uint64_t)-1;
 205             }
 206             break;
 207         }
 208         if (gsize < 24)
 209             return -1;
 210         if (!guidcmp(&g, &ff_asf_file_header)) {
 211             get_guid(pb, &asf->hdr.guid);
 212             asf->hdr.file_size          = get_le64(pb);
 213             asf->hdr.create_time        = get_le64(pb);
 214             asf->nb_packets             = get_le64(pb);
 215             asf->hdr.play_time          = get_le64(pb);
 216             asf->hdr.send_time          = get_le64(pb);
 217             asf->hdr.preroll            = get_le32(pb);
 218             asf->hdr.ignore             = get_le32(pb);
 219             asf->hdr.flags              = get_le32(pb);
 220             asf->hdr.min_pktsize        = get_le32(pb);
 221             asf->hdr.max_pktsize        = get_le32(pb);
 222             asf->hdr.max_bitrate        = get_le32(pb);
 223             asf->packet_size = asf->hdr.max_pktsize;
 224         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
 225             enum CodecType type;
 226             int type_specific_size, sizeX;
 227             uint64_t total_size;
 228             unsigned int tag1;
 229             int64_t pos1, pos2, start_time;
 230             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 231
 232             pos1 = url_ftell(pb);
 233
 234             st = av_new_stream(s, 0);
 235             if (!st)
 236                 return AVERROR(ENOMEM);
 237             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 238             asf_st = av_mallocz(sizeof(ASFStream));
 239             if (!asf_st)
 240                 return AVERROR(ENOMEM);
 241             st->priv_data = asf_st;
 242             start_time = asf->hdr.preroll;
 243
 244             asf_st->stream_language_index = 128; // invalid stream index means no language info
 245
 246             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 247                 st->duration = asf->hdr.send_time /
 248                     (10000000 / 1000) - start_time;
 249             }
 250             get_guid(pb, &g);
 251
 252             test_for_ext_stream_audio = 0;
 253             if (!guidcmp(&g, &ff_asf_audio_stream)) {
 254                 type = CODEC_TYPE_AUDIO;
 255             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
 256                 type = CODEC_TYPE_VIDEO;
 257             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
 258                 type = CODEC_TYPE_DATA;
 259             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 260                 test_for_ext_stream_audio = 1;
 261                 type = CODEC_TYPE_UNKNOWN;
 262             } else {
 263                 return -1;
 264             }
 265             get_guid(pb, &g);
 266             total_size = get_le64(pb);
 267             type_specific_size = get_le32(pb);
 268             get_le32(pb);
 269             st->id = get_le16(pb) & 0x7f; /* stream id */
 270             // mapping of asf ID to AV stream ID;
 271             asf->asfid2avid[st->id] = s->nb_streams - 1;
 272
 273             get_le32(pb);
 274
 275             if (test_for_ext_stream_audio) {
 276                 get_guid(pb, &g);
 277                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 278                     type = CODEC_TYPE_AUDIO;
 279                     is_dvr_ms_audio=1;
 280                     get_guid(pb, &g);
 281                     get_le32(pb);
 282                     get_le32(pb);
 283                     get_le32(pb);
 284                     get_guid(pb, &g);
 285                     get_le32(pb);
 286                 }
 287             }
 288
 289             st->codec->codec_type = type;
 290             if (type == CODEC_TYPE_AUDIO) {
 291                 get_wav_header(pb, st->codec, type_specific_size);
 292                 if (is_dvr_ms_audio) {
 293                     // codec_id and codec_tag are unreliable in dvr_ms
 294                     // files. Set them later by probing stream.
 295                     st->codec->codec_id = CODEC_ID_PROBE;
 296                     st->codec->codec_tag = 0;
 297                 }
 298                 if (st->codec->codec_id == CODEC_ID_AAC) {
 299                     st->need_parsing = AVSTREAM_PARSE_NONE;
 300                 } else {
 301                     st->need_parsing = AVSTREAM_PARSE_FULL;
 302                 }
 303                 /* We have to init the frame size at some point .... */
 304                 pos2 = url_ftell(pb);
 305                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 306                     asf_st->ds_span = get_byte(pb);
 307                     asf_st->ds_packet_size = get_le16(pb);
 308                     asf_st->ds_chunk_size = get_le16(pb);
 309                     get_le16(pb); //ds_data_size
 310                     get_byte(pb); //ds_silence_data
 311                 }
 312                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 313                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 314                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 315                 if (asf_st->ds_span > 1) {
 316                     if (!asf_st->ds_chunk_size
 317                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 318                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 319                         asf_st->ds_span = 0; // disable descrambling
 320                 }
 321                 switch (st->codec->codec_id) {
 322                 case CODEC_ID_MP3:
 323                     st->codec->frame_size = MPA_FRAME_SIZE;
 324                     break;
 325                 case CODEC_ID_PCM_S16LE:
 326                 case CODEC_ID_PCM_S16BE:
 327                 case CODEC_ID_PCM_U16LE:
 328                 case CODEC_ID_PCM_U16BE:
 329                 case CODEC_ID_PCM_S8:
 330                 case CODEC_ID_PCM_U8:
 331                 case CODEC_ID_PCM_ALAW:
 332                 case CODEC_ID_PCM_MULAW:
 333                     st->codec->frame_size = 1;
 334                     break;
 335                 default:
 336                     /* This is probably wrong, but it prevents a crash later */
 337                     st->codec->frame_size = 1;
 338                     break;
 339                 }
 340             } else if (type == CODEC_TYPE_VIDEO) {
 341                 get_le32(pb);
 342                 get_le32(pb);
 343                 get_byte(pb);
 344                 size = get_le16(pb); /* size */
 345                 sizeX= get_le32(pb); /* size */
 346                 st->codec->width = get_le32(pb);
 347                 st->codec->height = get_le32(pb);
 348                 /* not available for asf */
 349                 get_le16(pb); /* panes */
 350                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 351                 tag1 = get_le32(pb);
 352                 url_fskip(pb, 20);
 353 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 354                 size= sizeX;
 355                 if (size > 40) {
 356                     st->codec->extradata_size = size - 40;
 357                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 358                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 359                 }
 360
 361                 /* Extract palette from extradata if bpp <= 8 */
 362                 /* This code assumes that extradata contains only palette */
 363                 /* This is true for all paletted codecs implemented in ffmpeg */
 364                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 365                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 366 #ifdef WORDS_BIGENDIAN
 367                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 368                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 369 #else
 370                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 371                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 372 #endif
 373                     st->codec->palctrl->palette_changed = 1;
 374                 }
 375
 376                 st->codec->codec_tag = tag1;
 377                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 378                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 379                     st->need_parsing = AVSTREAM_PARSE_FULL;
 380             }
 381             pos2 = url_ftell(pb);
 382             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 383         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
 384             int len1, len2, len3, len4, len5;
 385
 386             len1 = get_le16(pb);
 387             len2 = get_le16(pb);
 388             len3 = get_le16(pb);
 389             len4 = get_le16(pb);
 390             len5 = get_le16(pb);
 391             get_tag(s, "title"    , 0, len1);
 392             get_tag(s, "author"   , 0, len2);
 393             get_tag(s, "copyright", 0, len3);
 394             get_tag(s, "comment"  , 0, len4);
 395             url_fskip(pb, len5);
 396         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
 397             int stream_count = get_le16(pb);
 398             int j;
 399
 400 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 401 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 402             for(j = 0; j < stream_count; j++) {
 403                 int flags, bitrate, stream_id;
 404
 405                 flags= get_le16(pb);
 406                 bitrate= get_le32(pb);
 407                 stream_id= (flags & 0x7f);
 408 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 409                 asf->stream_bitrates[stream_id]= bitrate;
 410             }
 411         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
 412             int j;
 413             int stream_count = get_le16(pb);
 414             for(j = 0; j < stream_count; j++) {
 415                 char lang[6];
 416                 unsigned int lang_len = get_byte(pb);
 417                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
 418                 if (j < 128)
 419                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 420             }
 421         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
 422             int desc_count, i;
 423
 424             desc_count = get_le16(pb);
 425             for(i=0;i<desc_count;i++) {
 426                     int name_len,value_type,value_len;
 427                     char name[1024];
 428
 429                     name_len = get_le16(pb);
 430                     get_str16_nolen(pb, name_len, name, sizeof(name));
 431                     value_type = get_le16(pb);
 432                     value_len  = get_le16(pb);
 433                     get_tag(s, name, value_type, value_len);
 434             }
 435         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
 436             int n, stream_num, name_len, value_len, value_type, value_num;
 437             n = get_le16(pb);
 438
 439             for(i=0;i<n;i++) {
 440                 char name[1024];
 441
 442                 get_le16(pb); //lang_list_index
 443                 stream_num= get_le16(pb);
 444                 name_len=   get_le16(pb);
 445                 value_type= get_le16(pb);
 446                 value_len=  get_le32(pb);
 447
 448                 get_str16_nolen(pb, name_len, name, sizeof(name));
 449 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 450                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 451                 url_fskip(pb, value_len - 2);
 452
 453                 if(stream_num<128){
 454                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 455                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 456                 }
 457             }
 458         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
 459             int ext_len, payload_ext_ct, stream_ct;
 460             uint32_t ext_d, leak_rate, stream_num;
 461             unsigned int stream_languageid_index;
 462
 463             get_le64(pb); // starttime
 464             get_le64(pb); // endtime
 465             leak_rate = get_le32(pb); // leak-datarate
 466             get_le32(pb); // bucket-datasize
 467             get_le32(pb); // init-bucket-fullness
 468             get_le32(pb); // alt-leak-datarate
 469             get_le32(pb); // alt-bucket-datasize
 470             get_le32(pb); // alt-init-bucket-fullness
 471             get_le32(pb); // max-object-size
 472             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 473             stream_num = get_le16(pb); // stream-num
 474
 475             stream_languageid_index = get_le16(pb); // stream-language-id-index
 476             if (stream_num < 128)
 477                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 478
 479             get_le64(pb); // avg frametime in 100ns units
 480             stream_ct = get_le16(pb); //stream-name-count
 481             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 482
 483             if (stream_num < 128)
 484                 bitrate[stream_num] = leak_rate;
 485
 486             for (i=0; i<stream_ct; i++){
 487                 get_le16(pb);
 488                 ext_len = get_le16(pb);
 489                 url_fseek(pb, ext_len, SEEK_CUR);
 490             }
 491
 492             for (i=0; i<payload_ext_ct; i++){
 493                 get_guid(pb, &g);
 494                 ext_d=get_le16(pb);
 495                 ext_len=get_le32(pb);
 496                 url_fseek(pb, ext_len, SEEK_CUR);
 497             }
 498
 499             // there could be a optional stream properties object to follow
 500             // if so the next iteration will pick it up
 501         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
 502             int v1, v2;
 503             get_guid(pb, &g);
 504             v1 = get_le32(pb);
 505             v2 = get_le16(pb);
 506 #if 0
 507         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
 508             int len, v1, n, num;
 509             char str[256], *q;
 510             char tag[16];
 511
 512             get_guid(pb, &g);
 513             print_guid(&g);
 514
 515             n = get_le32(pb);
 516             for(i=0;i<n;i++) {
 517                 num = get_le16(pb); /* stream number */
 518                 get_str16(pb, str, sizeof(str));
 519                 get_str16(pb, str, sizeof(str));
 520                 len = get_le16(pb);
 521                 q = tag;
 522                 while (len > 0) {
 523                     v1 = get_byte(pb);
 524                     if ((q - tag) < sizeof(tag) - 1)
 525                         *q++ = v1;
 526                     len--;
 527                 }
 528                 *q = '\0';
 529             }
 530 #endif
 531         } else if (url_feof(pb)) {
 532             return -1;
 533         } else {
 534             url_fseek(pb, gsize - 24, SEEK_CUR);
 535         }
 536     }
 537     get_guid(pb, &g);
 538     get_le64(pb);
 539     get_byte(pb);
 540     get_byte(pb);
 541     if (url_feof(pb))
 542         return -1;
 543     asf->data_offset = url_ftell(pb);
 544     asf->packet_size_left = 0;
 545
 546
 547     for(i=0; i<128; i++){
 548         int stream_num= asf->asfid2avid[i];
 549         if(stream_num>=0){
 550             AVStream *st = s->streams[stream_num];
 551             if (!st->codec->bit_rate)
 552                 st->codec->bit_rate = bitrate[i];
 553             if (dar[i].num > 0 && dar[i].den > 0)
 554                 av_reduce(&st->sample_aspect_ratio.num,
 555                           &st->sample_aspect_ratio.den,
 556                           dar[i].num, dar[i].den, INT_MAX);
 557 //av_log(s, 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);
 558
 559             // copy and convert language codes to the frontend
 560             if (asf->streams[i].stream_language_index < 128) {
 561                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 562                 if (rfc1766 && strlen(rfc1766) > 1) {
 563                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 564                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 565                     if (iso6392)
 566                         av_metadata_set(&st->metadata, "language", iso6392);
 567                 }
 568             }
 569         }
 570     }
 571
 572     return 0;
 573 }
 574
 575 #define DO_2BITS(bits, var, defval) \
 576     switch (bits & 3) \
 577     { \
 578     case 3: var = get_le32(pb); rsize += 4; break; \
 579     case 2: var = get_le16(pb); rsize += 2; break; \
 580     case 1: var = get_byte(pb); rsize++; break; \
 581     default: var = defval; break; \
 582     }
 583
 584 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 585 {
 586     ASFContext *asf = s->priv_data;
 587     uint32_t packet_length, padsize;
 588     int rsize = 8;
 589     int c, d, e, off;
 590
 591     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
 592
 593     c=d=e=-1;
 594     while(off-- > 0){
 595         c=d; d=e;
 596         e= get_byte(pb);
 597         if(c == 0x82 && !d && !e)
 598             break;
 599     }
 600
 601     if (c != 0x82) {
 602         if (!url_feof(pb))
 603             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 604     }
 605     if ((c & 0x8f) == 0x82) {
 606         if (d || e) {
 607             if (!url_feof(pb))
 608                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 609             return -1;
 610         }
 611         c= get_byte(pb);
 612         d= get_byte(pb);
 613         rsize+=3;
 614     }else{
 615         url_fseek(pb, -1, SEEK_CUR); //FIXME
 616     }
 617
 618     asf->packet_flags    = c;
 619     asf->packet_property = d;
 620
 621     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 622     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 623     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 624
 625     //the following checks prevent overflows and infinite loops
 626     if(packet_length >= (1U<<29)){
 627         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 628         return -1;
 629     }
 630     if(padsize >= packet_length){
 631         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 632         return -1;
 633     }
 634
 635     asf->packet_timestamp = get_le32(pb);
 636     get_le16(pb); /* duration */
 637     // rsize has at least 11 bytes which have to be present
 638
 639     if (asf->packet_flags & 0x01) {
 640         asf->packet_segsizetype = get_byte(pb); rsize++;
 641         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 642     } else {
 643         asf->packet_segments = 1;
 644         asf->packet_segsizetype = 0x80;
 645     }
 646     asf->packet_size_left = packet_length - padsize - rsize;
 647     if (packet_length < asf->hdr.min_pktsize)
 648         padsize += asf->hdr.min_pktsize - packet_length;
 649     asf->packet_padsize = padsize;
 650     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 651     return 0;
 652 }
 653
 654 /**
 655  *
 656  * @return <0 if error
 657  */
 658 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 659     ASFContext *asf = s->priv_data;
 660     int rsize = 1;
 661     int num = get_byte(pb);
 662     int64_t ts0, ts1;
 663
 664     asf->packet_segments--;
 665     asf->packet_key_frame = num >> 7;
 666     asf->stream_index = asf->asfid2avid[num & 0x7f];
 667     // sequence should be ignored!
 668     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 669     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 670     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 671 //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);
 672     if (asf->packet_replic_size >= 8) {
 673         asf->packet_obj_size = get_le32(pb);
 674         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 675             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 676             return -1;
 677         }
 678         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 679         if(asf->packet_replic_size >= 8+38+4){
 680 //            for(i=0; i<asf->packet_replic_size-8; i++)
 681 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 682 //            av_log(s, AV_LOG_DEBUG, "\n");
 683             url_fskip(pb, 10);
 684             ts0= get_le64(pb);
 685             ts1= get_le64(pb);
 686             url_fskip(pb, 12);
 687             get_le32(pb);
 688             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 689             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 690             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 691         }else
 692             url_fskip(pb, asf->packet_replic_size - 8);
 693         rsize += asf->packet_replic_size; // FIXME - check validity
 694     } else if (asf->packet_replic_size==1){
 695         // multipacket - frag_offset is beginning timestamp
 696         asf->packet_time_start = asf->packet_frag_offset;
 697         asf->packet_frag_offset = 0;
 698         asf->packet_frag_timestamp = asf->packet_timestamp;
 699
 700         asf->packet_time_delta = get_byte(pb);
 701         rsize++;
 702     }else if(asf->packet_replic_size!=0){
 703         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 704         return -1;
 705     }
 706     if (asf->packet_flags & 0x01) {
 707         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 708         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 709             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 710             return -1;
 711         }
 712         //printf("Fragsize %d\n", asf->packet_frag_size);
 713     } else {
 714         asf->packet_frag_size = asf->packet_size_left - rsize;
 715         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 716     }
 717     if (asf->packet_replic_size == 1) {
 718         asf->packet_multi_size = asf->packet_frag_size;
 719         if (asf->packet_multi_size > asf->packet_size_left)
 720             return -1;
 721     }
 722     asf->packet_size_left -= rsize;
 723     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 724
 725     return 0;
 726 }
 727
 728 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 729 {
 730     ASFContext *asf = s->priv_data;
 731     ASFStream *asf_st = 0;
 732     for (;;) {
 733         if(url_feof(pb))
 734             return AVERROR_EOF;
 735         if (asf->packet_size_left < FRAME_HEADER_SIZE
 736             || asf->packet_segments < 1) {
 737             //asf->packet_size_left <= asf->packet_padsize) {
 738             int ret = asf->packet_size_left + asf->packet_padsize;
 739             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 740             assert(ret>=0);
 741             /* fail safe */
 742             url_fskip(pb, ret);
 743
 744             asf->packet_pos= url_ftell(pb);
 745             if (asf->data_object_size != (uint64_t)-1 &&
 746                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 747                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 748             return 1;
 749         }
 750         if (asf->packet_time_start == 0) {
 751             if(asf_read_frame_header(s, pb) < 0){
 752                 asf->packet_segments= 0;
 753                 continue;
 754             }
 755             if (asf->stream_index < 0
 756                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 757                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 758                 ) {
 759                 asf->packet_time_start = 0;
 760                 /* unhandled packet (should not happen) */
 761                 url_fskip(pb, asf->packet_frag_size);
 762                 asf->packet_size_left -= asf->packet_frag_size;
 763                 if(asf->stream_index < 0)
 764                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 765                 continue;
 766             }
 767             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 768         }
 769         asf_st = asf->asf_st;
 770
 771         if (asf->packet_replic_size == 1) {
 772             // frag_offset is here used as the beginning timestamp
 773             asf->packet_frag_timestamp = asf->packet_time_start;
 774             asf->packet_time_start += asf->packet_time_delta;
 775             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 776             asf->packet_size_left--;
 777             asf->packet_multi_size--;
 778             if (asf->packet_multi_size < asf->packet_obj_size)
 779             {
 780                 asf->packet_time_start = 0;
 781                 url_fskip(pb, asf->packet_multi_size);
 782                 asf->packet_size_left -= asf->packet_multi_size;
 783                 continue;
 784             }
 785             asf->packet_multi_size -= asf->packet_obj_size;
 786             //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);
 787         }
 788         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 789               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 790            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 791             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 792                 asf_st->frag_offset, asf->packet_frag_size,
 793                 asf->packet_obj_size, asf_st->pkt.size);
 794             asf->packet_obj_size= asf_st->pkt.size;
 795         }
 796
 797         if (   asf_st->pkt.size != asf->packet_obj_size
 798             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 799             if(asf_st->pkt.data){
 800                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 801                 asf_st->frag_offset = 0;
 802                 av_free_packet(&asf_st->pkt);
 803             }
 804             /* new packet */
 805             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 806             asf_st->seq = asf->packet_seq;
 807             asf_st->pkt.dts = asf->packet_frag_timestamp;
 808             asf_st->pkt.stream_index = asf->stream_index;
 809             asf_st->pkt.pos =
 810             asf_st->packet_pos= asf->packet_pos;
 811 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 812 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 813 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 814             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 815                 asf->packet_key_frame = 1;
 816             if (asf->packet_key_frame)
 817                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 818         }
 819
 820         /* read data */
 821         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 822         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 823         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 824         asf->packet_size_left -= asf->packet_frag_size;
 825         if (asf->packet_size_left < 0)
 826             continue;
 827
 828         if(   asf->packet_frag_offset >= asf_st->pkt.size
 829            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 830             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 831                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 832             continue;
 833         }
 834
 835         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 836                    asf->packet_frag_size);
 837         if (s->key && s->keylen == 20)
 838             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 839                             asf->packet_frag_size);
 840         asf_st->frag_offset += asf->packet_frag_size;
 841         /* test if whole packet is read */
 842         if (asf_st->frag_offset == asf_st->pkt.size) {
 843             //workaround for macroshit radio DVR-MS files
 844             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 845                && asf_st->pkt.size > 100){
 846                 int i;
 847                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 848                 if(i == asf_st->pkt.size){
 849                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 850                     asf_st->frag_offset = 0;
 851                     av_free_packet(&asf_st->pkt);
 852                     continue;
 853                 }
 854             }
 855
 856             /* return packet */
 857             if (asf_st->ds_span > 1) {
 858               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 859                     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);
 860               }else{
 861                 /* packet descrambling */
 862                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 863                 if (newdata) {
 864                     int offset = 0;
 865                     while (offset < asf_st->pkt.size) {
 866                         int off = offset / asf_st->ds_chunk_size;
 867                         int row = off / asf_st->ds_span;
 868                         int col = off % asf_st->ds_span;
 869                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 870                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 871
 872                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 873                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 874                         memcpy(newdata + offset,
 875                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 876                                asf_st->ds_chunk_size);
 877                         offset += asf_st->ds_chunk_size;
 878                     }
 879                     av_free(asf_st->pkt.data);
 880                     asf_st->pkt.data = newdata;
 881                 }
 882               }
 883             }
 884             asf_st->frag_offset = 0;
 885             *pkt= asf_st->pkt;
 886             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 887             asf_st->pkt.size = 0;
 888             asf_st->pkt.data = 0;
 889             break; // packet completed
 890         }
 891     }
 892     return 0;
 893 }
 894
 895 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 896 {
 897     ASFContext *asf = s->priv_data;
 898
 899     for (;;) {
 900         int ret;
 901
 902         /* parse cached packets, if any */
 903         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 904             return ret;
 905         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 906             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 907         asf->packet_time_start = 0;
 908     }
 909
 910     return 0;
 911 }
 912
 913 // Added to support seeking after packets have been read
 914 // If information is not reset, read_packet fails due to
 915 // leftover information from previous reads
 916 static void asf_reset_header(AVFormatContext *s)
 917 {
 918     ASFContext *asf = s->priv_data;
 919     ASFStream *asf_st;
 920     int i;
 921
 922     asf->packet_nb_frames = 0;
 923     asf->packet_size_left = 0;
 924     asf->packet_segments = 0;
 925     asf->packet_flags = 0;
 926     asf->packet_property = 0;
 927     asf->packet_timestamp = 0;
 928     asf->packet_segsizetype = 0;
 929     asf->packet_segments = 0;
 930     asf->packet_seq = 0;
 931     asf->packet_replic_size = 0;
 932     asf->packet_key_frame = 0;
 933     asf->packet_padsize = 0;
 934     asf->packet_frag_offset = 0;
 935     asf->packet_frag_size = 0;
 936     asf->packet_frag_timestamp = 0;
 937     asf->packet_multi_size = 0;
 938     asf->packet_obj_size = 0;
 939     asf->packet_time_delta = 0;
 940     asf->packet_time_start = 0;
 941
 942     for(i=0; i<s->nb_streams; i++){
 943         asf_st= s->streams[i]->priv_data;
 944         av_free_packet(&asf_st->pkt);
 945         asf_st->frag_offset=0;
 946         asf_st->seq=0;
 947     }
 948     asf->asf_st= NULL;
 949 }
 950
 951 static int asf_read_close(AVFormatContext *s)
 952 {
 953     int i;
 954
 955     asf_reset_header(s);
 956     for(i=0;i<s->nb_streams;i++) {
 957         AVStream *st = s->streams[i];
 958         av_free(st->codec->palctrl);
 959     }
 960     return 0;
 961 }
 962
 963 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 964 {
 965     ASFContext *asf = s->priv_data;
 966     AVPacket pkt1, *pkt = &pkt1;
 967     ASFStream *asf_st;
 968     int64_t pts;
 969     int64_t pos= *ppos;
 970     int i;
 971     int64_t start_pos[s->nb_streams];
 972
 973     for(i=0; i<s->nb_streams; i++){
 974         start_pos[i]= pos;
 975     }
 976
 977     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 978     *ppos= pos;
 979     url_fseek(s->pb, pos, SEEK_SET);
 980
 981 //printf("asf_read_pts\n");
 982     asf_reset_header(s);
 983     for(;;){
 984         if (av_read_frame(s, pkt) < 0){
 985             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 986             return AV_NOPTS_VALUE;
 987         }
 988
 989         pts= pkt->pts;
 990
 991         av_free_packet(pkt);
 992         if(pkt->flags&PKT_FLAG_KEY){
 993             i= pkt->stream_index;
 994
 995             asf_st= s->streams[i]->priv_data;
 996
 997 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 998             pos= asf_st->packet_pos;
 999
1000             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1001             start_pos[i]= asf_st->packet_pos + 1;
1002
1003             if(pkt->stream_index == stream_index)
1004                break;
1005         }
1006     }
1007
1008     *ppos= pos;
1009 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1010
1011     return pts;
1012 }
1013
1014 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1015 {
1016     ff_asf_guid g;
1017     ASFContext *asf = s->priv_data;
1018     int64_t current_pos= url_ftell(s->pb);
1019     int i;
1020
1021     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1022     get_guid(s->pb, &g);
1023     if (!guidcmp(&g, &index_guid)) {
1024         int64_t itime;
1025         int pct, ict;
1026         int64_t av_unused gsize= get_le64(s->pb);
1027         get_guid(s->pb, &g);
1028         itime=get_le64(s->pb);
1029         pct=get_le32(s->pb);
1030         ict=get_le32(s->pb);
1031         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1032
1033         for (i=0;i<ict;i++){
1034             int pktnum=get_le32(s->pb);
1035             int pktct =get_le16(s->pb);
1036             int64_t pos      = s->data_offset + asf->packet_size*(int64_t)pktnum;
1037             int64_t index_pts= av_rescale(itime, i, 10000);
1038
1039             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1040             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1041         }
1042         asf->index_read= 1;
1043     }
1044     url_fseek(s->pb, current_pos, SEEK_SET);
1045 }
1046
1047 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1048 {
1049     ASFContext *asf = s->priv_data;
1050     AVStream *st = s->streams[stream_index];
1051     int64_t pos;
1052     int index;
1053
1054     if (asf->packet_size <= 0)
1055         return -1;
1056
1057     /* Try using the protocol's read_seek if available */
1058     if(s->pb) {
1059         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1060         if(ret >= 0)
1061             asf_reset_header(s);
1062         if (ret != AVERROR(ENOSYS))
1063             return ret;
1064     }
1065
1066     if (!asf->index_read)
1067         asf_build_simple_index(s, stream_index);
1068
1069     if(!(asf->index_read && st->index_entries)){
1070         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1071             return -1;
1072     }else{
1073         index= av_index_search_timestamp(st, pts, flags);
1074         if(index<0)
1075             return -1;
1076
1077         /* find the position */
1078         pos = st->index_entries[index].pos;
1079
1080     // various attempts to find key frame have failed so far
1081     //    asf_reset_header(s);
1082     //    url_fseek(s->pb, pos, SEEK_SET);
1083     //    key_pos = pos;
1084     //     for(i=0;i<16;i++){
1085     //         pos = url_ftell(s->pb);
1086     //         if (av_read_frame(s, &pkt) < 0){
1087     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1088     //             return -1;
1089     //         }
1090     //         asf_st = s->streams[stream_index]->priv_data;
1091     //         pos += st->parser->frame_offset;
1092     //
1093     //         if (pkt.size > b) {
1094     //             b = pkt.size;
1095     //             key_pos = pos;
1096     //         }
1097     //
1098     //         av_free_packet(&pkt);
1099     //     }
1100
1101         /* do the seek */
1102         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1103         url_fseek(s->pb, pos, SEEK_SET);
1104     }
1105     asf_reset_header(s);
1106     return 0;
1107 }
1108
1109 AVInputFormat asf_demuxer = {
1110     "asf",
1111     NULL_IF_CONFIG_SMALL("ASF format"),
1112     sizeof(ASFContext),
1113     asf_probe,
1114     asf_read_header,
1115     asf_read_packet,
1116     asf_read_close,
1117     asf_read_seek,
1118     asf_read_pts,
1119     .metadata_conv = ff_asf_metadata_conv,
1120 };