git.sesse.net Git - ffmpeg/blob - 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 //#define DEBUG
  23
  24 #include "libavutil/common.h"
  25 #include "libavutil/avstring.h"
  26 #include "libavcodec/mpegaudio.h"
  27 #include "avformat.h"
  28 #include "riff.h"
  29 #include "asf.h"
  30 #include "asfcrypt.h"
  31 #include "avlanguage.h"
  32
  33 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  34
  35 #undef NDEBUG
  36 #include <assert.h>
  37
  38 #define FRAME_HEADER_SIZE 17
  39 // Fix Me! FRAME_HEADER_SIZE may be different.
  40
  41 static const ff_asf_guid index_guid = {
  42     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  43 };
  44
  45 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
  46     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  47 };
  48 /**********************************/
  49 /* decoding */
  50
  51 static int guidcmp(const void *g1, const void *g2)
  52 {
  53     return memcmp(g1, g2, sizeof(ff_asf_guid));
  54 }
  55
  56 #ifdef DEBUG
  57 #define PRINT_IF_GUID(g,cmp) \
  58 if (!guidcmp(g, &cmp)) \
  59     dprintf(NULL, "(GUID: %s) ", #cmp)
  60
  61 static void print_guid(const ff_asf_guid *g)
  62 {
  63     int i;
  64     PRINT_IF_GUID(g, ff_asf_header);
  65     else PRINT_IF_GUID(g, ff_asf_file_header);
  66     else PRINT_IF_GUID(g, ff_asf_stream_header);
  67     else PRINT_IF_GUID(g, ff_asf_audio_stream);
  68     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
  69     else PRINT_IF_GUID(g, ff_asf_video_stream);
  70     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
  71     else PRINT_IF_GUID(g, ff_asf_command_stream);
  72     else PRINT_IF_GUID(g, ff_asf_comment_header);
  73     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
  74     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
  75     else PRINT_IF_GUID(g, ff_asf_data_header);
  76     else PRINT_IF_GUID(g, index_guid);
  77     else PRINT_IF_GUID(g, ff_asf_head1_guid);
  78     else PRINT_IF_GUID(g, ff_asf_head2_guid);
  79     else PRINT_IF_GUID(g, ff_asf_my_guid);
  80     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
  81     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
  82     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
  83     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
  84     else PRINT_IF_GUID(g, ff_asf_metadata_header);
  85     else PRINT_IF_GUID(g, stream_bitrate_guid);
  86     else PRINT_IF_GUID(g, ff_asf_language_guid);
  87     else
  88         dprintf(NULL, "(GUID: unknown) ");
  89     for(i=0;i<16;i++)
  90         dprintf(NULL, " 0x%02x,", (*g)[i]);
  91     dprintf(NULL, "}\n");
  92 }
  93 #undef PRINT_IF_GUID
  94 #else
  95 #define print_guid(g)
  96 #endif
  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     while (len > 1) {
 126         uint8_t tmp;
 127         uint32_t ch;
 128
 129         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
 130         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 131     }
 132     if (len > 0)
 133         url_fskip(pb, len);
 134     *q = '\0';
 135 }
 136
 137 static int asf_probe(AVProbeData *pd)
 138 {
 139     /* check file header */
 140     if (!guidcmp(pd->buf, &ff_asf_header))
 141         return AVPROBE_SCORE_MAX;
 142     else
 143         return 0;
 144 }
 145
 146 static int get_value(ByteIOContext *pb, int type){
 147     switch(type){
 148         case 2: return get_le32(pb);
 149         case 3: return get_le32(pb);
 150         case 4: return get_le64(pb);
 151         case 5: return get_le16(pb);
 152         default:return INT_MIN;
 153     }
 154 }
 155
 156 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 157 {
 158     char *value;
 159
 160     if ((unsigned)len >= (UINT_MAX - 1)/2)
 161         return;
 162
 163     value = av_malloc(2*len+1);
 164     if (!value)
 165         return;
 166
 167     if (type == 0) {         // UTF16-LE
 168         get_str16_nolen(s->pb, len, value, 2*len + 1);
 169     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
 170         uint64_t num = get_value(s->pb, type);
 171         snprintf(value, len, "%"PRIu64, num);
 172     } else {
 173         url_fskip(s->pb, len);
 174         av_freep(&value);
 175         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
 176         return;
 177     }
 178     if (!strncmp(key, "WM/", 3))
 179         key += 3;
 180     av_metadata_set2(&s->metadata, key, value, 0);
 181     av_freep(&value);
 182 }
 183
 184 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 185 {
 186     ASFContext *asf = s->priv_data;
 187     ff_asf_guid g;
 188     ByteIOContext *pb = s->pb;
 189     AVStream *st;
 190     ASFStream *asf_st;
 191     int size, i;
 192     int64_t gsize;
 193     AVRational dar[128];
 194     uint32_t bitrate[128];
 195
 196     memset(dar, 0, sizeof(dar));
 197     memset(bitrate, 0, sizeof(bitrate));
 198
 199     get_guid(pb, &g);
 200     if (guidcmp(&g, &ff_asf_header))
 201         return -1;
 202     get_le64(pb);
 203     get_le32(pb);
 204     get_byte(pb);
 205     get_byte(pb);
 206     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 207     for(;;) {
 208         get_guid(pb, &g);
 209         gsize = get_le64(pb);
 210         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
 211         print_guid(&g);
 212         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 213         if (!guidcmp(&g, &ff_asf_data_header)) {
 214             asf->data_object_offset = url_ftell(pb);
 215             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 216             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 217                 asf->data_object_size = gsize - 24;
 218             } else {
 219                 asf->data_object_size = (uint64_t)-1;
 220             }
 221             break;
 222         }
 223         if (gsize < 24)
 224             return -1;
 225         if (!guidcmp(&g, &ff_asf_file_header)) {
 226             get_guid(pb, &asf->hdr.guid);
 227             asf->hdr.file_size          = get_le64(pb);
 228             asf->hdr.create_time        = get_le64(pb);
 229             asf->nb_packets             = get_le64(pb);
 230             asf->hdr.play_time          = get_le64(pb);
 231             asf->hdr.send_time          = get_le64(pb);
 232             asf->hdr.preroll            = get_le32(pb);
 233             asf->hdr.ignore             = get_le32(pb);
 234             asf->hdr.flags              = get_le32(pb);
 235             asf->hdr.min_pktsize        = get_le32(pb);
 236             asf->hdr.max_pktsize        = get_le32(pb);
 237             asf->hdr.max_bitrate        = get_le32(pb);
 238             s->packet_size = asf->hdr.max_pktsize;
 239         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
 240             enum CodecType type;
 241             int type_specific_size, sizeX;
 242             uint64_t total_size;
 243             unsigned int tag1;
 244             int64_t pos1, pos2, start_time;
 245             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 246
 247             pos1 = url_ftell(pb);
 248
 249             st = av_new_stream(s, 0);
 250             if (!st)
 251                 return AVERROR(ENOMEM);
 252             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 253             asf_st = av_mallocz(sizeof(ASFStream));
 254             if (!asf_st)
 255                 return AVERROR(ENOMEM);
 256             st->priv_data = asf_st;
 257             start_time = asf->hdr.preroll;
 258
 259             asf_st->stream_language_index = 128; // invalid stream index means no language info
 260
 261             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 262                 st->duration = asf->hdr.play_time /
 263                     (10000000 / 1000) - start_time;
 264             }
 265             get_guid(pb, &g);
 266
 267             test_for_ext_stream_audio = 0;
 268             if (!guidcmp(&g, &ff_asf_audio_stream)) {
 269                 type = CODEC_TYPE_AUDIO;
 270             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
 271                 type = CODEC_TYPE_VIDEO;
 272             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
 273                 type = CODEC_TYPE_DATA;
 274             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 275                 test_for_ext_stream_audio = 1;
 276                 type = CODEC_TYPE_UNKNOWN;
 277             } else {
 278                 return -1;
 279             }
 280             get_guid(pb, &g);
 281             total_size = get_le64(pb);
 282             type_specific_size = get_le32(pb);
 283             get_le32(pb);
 284             st->id = get_le16(pb) & 0x7f; /* stream id */
 285             // mapping of asf ID to AV stream ID;
 286             asf->asfid2avid[st->id] = s->nb_streams - 1;
 287
 288             get_le32(pb);
 289
 290             if (test_for_ext_stream_audio) {
 291                 get_guid(pb, &g);
 292                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 293                     type = CODEC_TYPE_AUDIO;
 294                     is_dvr_ms_audio=1;
 295                     get_guid(pb, &g);
 296                     get_le32(pb);
 297                     get_le32(pb);
 298                     get_le32(pb);
 299                     get_guid(pb, &g);
 300                     get_le32(pb);
 301                 }
 302             }
 303
 304             st->codec->codec_type = type;
 305             if (type == CODEC_TYPE_AUDIO) {
 306                 ff_get_wav_header(pb, st->codec, type_specific_size);
 307                 if (is_dvr_ms_audio) {
 308                     // codec_id and codec_tag are unreliable in dvr_ms
 309                     // files. Set them later by probing stream.
 310                     st->codec->codec_id = CODEC_ID_PROBE;
 311                     st->codec->codec_tag = 0;
 312                 }
 313                 if (st->codec->codec_id == CODEC_ID_AAC) {
 314                     st->need_parsing = AVSTREAM_PARSE_NONE;
 315                 } else {
 316                     st->need_parsing = AVSTREAM_PARSE_FULL;
 317                 }
 318                 /* We have to init the frame size at some point .... */
 319                 pos2 = url_ftell(pb);
 320                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 321                     asf_st->ds_span = get_byte(pb);
 322                     asf_st->ds_packet_size = get_le16(pb);
 323                     asf_st->ds_chunk_size = get_le16(pb);
 324                     get_le16(pb); //ds_data_size
 325                     get_byte(pb); //ds_silence_data
 326                 }
 327                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 328                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 329                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 330                 if (asf_st->ds_span > 1) {
 331                     if (!asf_st->ds_chunk_size
 332                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 333                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 334                         asf_st->ds_span = 0; // disable descrambling
 335                 }
 336                 switch (st->codec->codec_id) {
 337                 case CODEC_ID_MP3:
 338                     st->codec->frame_size = MPA_FRAME_SIZE;
 339                     break;
 340                 case CODEC_ID_PCM_S16LE:
 341                 case CODEC_ID_PCM_S16BE:
 342                 case CODEC_ID_PCM_U16LE:
 343                 case CODEC_ID_PCM_U16BE:
 344                 case CODEC_ID_PCM_S8:
 345                 case CODEC_ID_PCM_U8:
 346                 case CODEC_ID_PCM_ALAW:
 347                 case CODEC_ID_PCM_MULAW:
 348                     st->codec->frame_size = 1;
 349                     break;
 350                 default:
 351                     /* This is probably wrong, but it prevents a crash later */
 352                     st->codec->frame_size = 1;
 353                     break;
 354                 }
 355             } else if (type == CODEC_TYPE_VIDEO) {
 356                 get_le32(pb);
 357                 get_le32(pb);
 358                 get_byte(pb);
 359                 size = get_le16(pb); /* size */
 360                 sizeX= get_le32(pb); /* size */
 361                 st->codec->width = get_le32(pb);
 362                 st->codec->height = get_le32(pb);
 363                 /* not available for asf */
 364                 get_le16(pb); /* panes */
 365                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 366                 tag1 = get_le32(pb);
 367                 url_fskip(pb, 20);
 368 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 369                 size= sizeX;
 370                 if (size > 40) {
 371                     st->codec->extradata_size = size - 40;
 372                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 373                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 374                 }
 375
 376                 /* Extract palette from extradata if bpp <= 8 */
 377                 /* This code assumes that extradata contains only palette */
 378                 /* This is true for all paletted codecs implemented in ffmpeg */
 379                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 380                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 381 #if HAVE_BIGENDIAN
 382                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 383                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 384 #else
 385                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 386                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 387 #endif
 388                     st->codec->palctrl->palette_changed = 1;
 389                 }
 390
 391                 st->codec->codec_tag = tag1;
 392                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
 393                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 394                     st->need_parsing = AVSTREAM_PARSE_FULL;
 395             }
 396             pos2 = url_ftell(pb);
 397             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 398         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
 399             int len1, len2, len3, len4, len5;
 400
 401             len1 = get_le16(pb);
 402             len2 = get_le16(pb);
 403             len3 = get_le16(pb);
 404             len4 = get_le16(pb);
 405             len5 = get_le16(pb);
 406             get_tag(s, "title"    , 0, len1);
 407             get_tag(s, "author"   , 0, len2);
 408             get_tag(s, "copyright", 0, len3);
 409             get_tag(s, "comment"  , 0, len4);
 410             url_fskip(pb, len5);
 411         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
 412             int stream_count = get_le16(pb);
 413             int j;
 414
 415 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 416 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 417             for(j = 0; j < stream_count; j++) {
 418                 int flags, bitrate, stream_id;
 419
 420                 flags= get_le16(pb);
 421                 bitrate= get_le32(pb);
 422                 stream_id= (flags & 0x7f);
 423 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 424                 asf->stream_bitrates[stream_id]= bitrate;
 425             }
 426         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
 427             int j;
 428             int stream_count = get_le16(pb);
 429             for(j = 0; j < stream_count; j++) {
 430                 char lang[6];
 431                 unsigned int lang_len = get_byte(pb);
 432                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
 433                 if (j < 128)
 434                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 435             }
 436         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
 437             int desc_count, i;
 438
 439             desc_count = get_le16(pb);
 440             for(i=0;i<desc_count;i++) {
 441                     int name_len,value_type,value_len;
 442                     char name[1024];
 443
 444                     name_len = get_le16(pb);
 445                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 446                         name_len += 1;
 447                     get_str16_nolen(pb, name_len, name, sizeof(name));
 448                     value_type = get_le16(pb);
 449                     value_len  = get_le16(pb);
 450                     if (!value_type && value_len%2)
 451                         value_len += 1;
 452                     get_tag(s, name, value_type, value_len);
 453             }
 454         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
 455             int n, stream_num, name_len, value_len, value_type, value_num;
 456             n = get_le16(pb);
 457
 458             for(i=0;i<n;i++) {
 459                 char name[1024];
 460
 461                 get_le16(pb); //lang_list_index
 462                 stream_num= get_le16(pb);
 463                 name_len=   get_le16(pb);
 464                 value_type= get_le16(pb);
 465                 value_len=  get_le32(pb);
 466
 467                 get_str16_nolen(pb, name_len, name, sizeof(name));
 468 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 469                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 470                 url_fskip(pb, value_len - 2);
 471
 472                 if(stream_num<128){
 473                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 474                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 475                 }
 476             }
 477         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
 478             int ext_len, payload_ext_ct, stream_ct;
 479             uint32_t ext_d, leak_rate, stream_num;
 480             unsigned int stream_languageid_index;
 481
 482             get_le64(pb); // starttime
 483             get_le64(pb); // endtime
 484             leak_rate = get_le32(pb); // leak-datarate
 485             get_le32(pb); // bucket-datasize
 486             get_le32(pb); // init-bucket-fullness
 487             get_le32(pb); // alt-leak-datarate
 488             get_le32(pb); // alt-bucket-datasize
 489             get_le32(pb); // alt-init-bucket-fullness
 490             get_le32(pb); // max-object-size
 491             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 492             stream_num = get_le16(pb); // stream-num
 493
 494             stream_languageid_index = get_le16(pb); // stream-language-id-index
 495             if (stream_num < 128)
 496                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 497
 498             get_le64(pb); // avg frametime in 100ns units
 499             stream_ct = get_le16(pb); //stream-name-count
 500             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 501
 502             if (stream_num < 128)
 503                 bitrate[stream_num] = leak_rate;
 504
 505             for (i=0; i<stream_ct; i++){
 506                 get_le16(pb);
 507                 ext_len = get_le16(pb);
 508                 url_fseek(pb, ext_len, SEEK_CUR);
 509             }
 510
 511             for (i=0; i<payload_ext_ct; i++){
 512                 get_guid(pb, &g);
 513                 ext_d=get_le16(pb);
 514                 ext_len=get_le32(pb);
 515                 url_fseek(pb, ext_len, SEEK_CUR);
 516             }
 517
 518             // there could be a optional stream properties object to follow
 519             // if so the next iteration will pick it up
 520         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
 521             int v1, v2;
 522             get_guid(pb, &g);
 523             v1 = get_le32(pb);
 524             v2 = get_le16(pb);
 525 #if 0
 526         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
 527             int len, v1, n, num;
 528             char str[256], *q;
 529             char tag[16];
 530
 531             get_guid(pb, &g);
 532             print_guid(&g);
 533
 534             n = get_le32(pb);
 535             for(i=0;i<n;i++) {
 536                 num = get_le16(pb); /* stream number */
 537                 get_str16(pb, str, sizeof(str));
 538                 get_str16(pb, str, sizeof(str));
 539                 len = get_le16(pb);
 540                 q = tag;
 541                 while (len > 0) {
 542                     v1 = get_byte(pb);
 543                     if ((q - tag) < sizeof(tag) - 1)
 544                         *q++ = v1;
 545                     len--;
 546                 }
 547                 *q = '\0';
 548             }
 549 #endif
 550         } else if (url_feof(pb)) {
 551             return -1;
 552         } else {
 553             if (!s->keylen) {
 554                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
 555                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 556                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
 557                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 558                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
 559                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 560                 }
 561             }
 562             url_fseek(pb, gsize - 24, SEEK_CUR);
 563         }
 564     }
 565     get_guid(pb, &g);
 566     get_le64(pb);
 567     get_byte(pb);
 568     get_byte(pb);
 569     if (url_feof(pb))
 570         return -1;
 571     asf->data_offset = url_ftell(pb);
 572     asf->packet_size_left = 0;
 573
 574
 575     for(i=0; i<128; i++){
 576         int stream_num= asf->asfid2avid[i];
 577         if(stream_num>=0){
 578             AVStream *st = s->streams[stream_num];
 579             if (!st->codec->bit_rate)
 580                 st->codec->bit_rate = bitrate[i];
 581             if (dar[i].num > 0 && dar[i].den > 0)
 582                 av_reduce(&st->sample_aspect_ratio.num,
 583                           &st->sample_aspect_ratio.den,
 584                           dar[i].num, dar[i].den, INT_MAX);
 585 //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);
 586
 587             // copy and convert language codes to the frontend
 588             if (asf->streams[i].stream_language_index < 128) {
 589                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 590                 if (rfc1766 && strlen(rfc1766) > 1) {
 591                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 592                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 593                     if (iso6392)
 594                         av_metadata_set(&st->metadata, "language", iso6392);
 595                 }
 596             }
 597         }
 598     }
 599
 600     return 0;
 601 }
 602
 603 #define DO_2BITS(bits, var, defval) \
 604     switch (bits & 3) \
 605     { \
 606     case 3: var = get_le32(pb); rsize += 4; break; \
 607     case 2: var = get_le16(pb); rsize += 2; break; \
 608     case 1: var = get_byte(pb); rsize++; break; \
 609     default: var = defval; break; \
 610     }
 611
 612 /**
 613  * Load a single ASF packet into the demuxer.
 614  * @param s demux context
 615  * @param pb context to read data from
 616  * @returns 0 on success, <0 on error
 617  */
 618 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 619 {
 620     ASFContext *asf = s->priv_data;
 621     uint32_t packet_length, padsize;
 622     int rsize = 8;
 623     int c, d, e, off;
 624
 625     // if we do not know packet size, allow skipping up to 32 kB
 626     off= 32768;
 627     if (s->packet_size > 0)
 628         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 629
 630     c=d=e=-1;
 631     while(off-- > 0){
 632         c=d; d=e;
 633         e= get_byte(pb);
 634         if(c == 0x82 && !d && !e)
 635             break;
 636     }
 637
 638     if (c != 0x82) {
 639         /**
 640          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 641          * if the packet sync code above triggers -EAGAIN). This does not
 642          * imply complete -EAGAIN handling support at random positions in
 643          * the stream.
 644          */
 645         if (url_ferror(pb) == AVERROR(EAGAIN))
 646             return AVERROR(EAGAIN);
 647         if (!url_feof(pb))
 648             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 649     }
 650     if ((c & 0x8f) == 0x82) {
 651         if (d || e) {
 652             if (!url_feof(pb))
 653                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 654             return -1;
 655         }
 656         c= get_byte(pb);
 657         d= get_byte(pb);
 658         rsize+=3;
 659     }else{
 660         url_fseek(pb, -1, SEEK_CUR); //FIXME
 661     }
 662
 663     asf->packet_flags    = c;
 664     asf->packet_property = d;
 665
 666     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 667     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 668     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 669
 670     //the following checks prevent overflows and infinite loops
 671     if(!packet_length || packet_length >= (1U<<29)){
 672         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 673         return -1;
 674     }
 675     if(padsize >= packet_length){
 676         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 677         return -1;
 678     }
 679
 680     asf->packet_timestamp = get_le32(pb);
 681     get_le16(pb); /* duration */
 682     // rsize has at least 11 bytes which have to be present
 683
 684     if (asf->packet_flags & 0x01) {
 685         asf->packet_segsizetype = get_byte(pb); rsize++;
 686         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 687     } else {
 688         asf->packet_segments = 1;
 689         asf->packet_segsizetype = 0x80;
 690     }
 691     asf->packet_size_left = packet_length - padsize - rsize;
 692     if (packet_length < asf->hdr.min_pktsize)
 693         padsize += asf->hdr.min_pktsize - packet_length;
 694     asf->packet_padsize = padsize;
 695     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 696     return 0;
 697 }
 698
 699 /**
 700  *
 701  * @return <0 if error
 702  */
 703 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 704     ASFContext *asf = s->priv_data;
 705     int rsize = 1;
 706     int num = get_byte(pb);
 707     int64_t ts0, ts1;
 708
 709     asf->packet_segments--;
 710     asf->packet_key_frame = num >> 7;
 711     asf->stream_index = asf->asfid2avid[num & 0x7f];
 712     // sequence should be ignored!
 713     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 714     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 715     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 716 //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);
 717     if (asf->packet_replic_size >= 8) {
 718         asf->packet_obj_size = get_le32(pb);
 719         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 720             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 721             return -1;
 722         }
 723         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 724         if(asf->packet_replic_size >= 8+38+4){
 725 //            for(i=0; i<asf->packet_replic_size-8; i++)
 726 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 727 //            av_log(s, AV_LOG_DEBUG, "\n");
 728             url_fskip(pb, 10);
 729             ts0= get_le64(pb);
 730             ts1= get_le64(pb);
 731             url_fskip(pb, 12);
 732             get_le32(pb);
 733             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 734             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 735             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 736         }else
 737             url_fskip(pb, asf->packet_replic_size - 8);
 738         rsize += asf->packet_replic_size; // FIXME - check validity
 739     } else if (asf->packet_replic_size==1){
 740         // multipacket - frag_offset is beginning timestamp
 741         asf->packet_time_start = asf->packet_frag_offset;
 742         asf->packet_frag_offset = 0;
 743         asf->packet_frag_timestamp = asf->packet_timestamp;
 744
 745         asf->packet_time_delta = get_byte(pb);
 746         rsize++;
 747     }else if(asf->packet_replic_size!=0){
 748         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 749         return -1;
 750     }
 751     if (asf->packet_flags & 0x01) {
 752         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 753         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 754             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 755             return -1;
 756         }
 757         //printf("Fragsize %d\n", asf->packet_frag_size);
 758     } else {
 759         asf->packet_frag_size = asf->packet_size_left - rsize;
 760         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 761     }
 762     if (asf->packet_replic_size == 1) {
 763         asf->packet_multi_size = asf->packet_frag_size;
 764         if (asf->packet_multi_size > asf->packet_size_left)
 765             return -1;
 766     }
 767     asf->packet_size_left -= rsize;
 768     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 769
 770     return 0;
 771 }
 772
 773 /**
 774  * Parse data from individual ASF packets (which were previously loaded
 775  * with asf_get_packet()).
 776  * @param s demux context
 777  * @param pb context to read data from
 778  * @param pkt pointer to store packet data into
 779  * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
 780  *          packets need to be loaded (through asf_get_packet())
 781  */
 782 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 783 {
 784     ASFContext *asf = s->priv_data;
 785     ASFStream *asf_st = 0;
 786     for (;;) {
 787         if(url_feof(pb))
 788             return AVERROR_EOF;
 789         if (asf->packet_size_left < FRAME_HEADER_SIZE
 790             || asf->packet_segments < 1) {
 791             //asf->packet_size_left <= asf->packet_padsize) {
 792             int ret = asf->packet_size_left + asf->packet_padsize;
 793             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 794             assert(ret>=0);
 795             /* fail safe */
 796             url_fskip(pb, ret);
 797
 798             asf->packet_pos= url_ftell(pb);
 799             if (asf->data_object_size != (uint64_t)-1 &&
 800                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 801                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 802             return 1;
 803         }
 804         if (asf->packet_time_start == 0) {
 805             if(asf_read_frame_header(s, pb) < 0){
 806                 asf->packet_segments= 0;
 807                 continue;
 808             }
 809             if (asf->stream_index < 0
 810                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 811                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 812                 ) {
 813                 asf->packet_time_start = 0;
 814                 /* unhandled packet (should not happen) */
 815                 url_fskip(pb, asf->packet_frag_size);
 816                 asf->packet_size_left -= asf->packet_frag_size;
 817                 if(asf->stream_index < 0)
 818                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 819                 continue;
 820             }
 821             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 822         }
 823         asf_st = asf->asf_st;
 824
 825         if (asf->packet_replic_size == 1) {
 826             // frag_offset is here used as the beginning timestamp
 827             asf->packet_frag_timestamp = asf->packet_time_start;
 828             asf->packet_time_start += asf->packet_time_delta;
 829             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 830             asf->packet_size_left--;
 831             asf->packet_multi_size--;
 832             if (asf->packet_multi_size < asf->packet_obj_size)
 833             {
 834                 asf->packet_time_start = 0;
 835                 url_fskip(pb, asf->packet_multi_size);
 836                 asf->packet_size_left -= asf->packet_multi_size;
 837                 continue;
 838             }
 839             asf->packet_multi_size -= asf->packet_obj_size;
 840             //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);
 841         }
 842         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 843               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 844            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 845             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 846                 asf_st->frag_offset, asf->packet_frag_size,
 847                 asf->packet_obj_size, asf_st->pkt.size);
 848             asf->packet_obj_size= asf_st->pkt.size;
 849         }
 850
 851         if (   asf_st->pkt.size != asf->packet_obj_size
 852             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 853             if(asf_st->pkt.data){
 854                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 855                 asf_st->frag_offset = 0;
 856                 av_free_packet(&asf_st->pkt);
 857             }
 858             /* new packet */
 859             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 860             asf_st->seq = asf->packet_seq;
 861             asf_st->pkt.dts = asf->packet_frag_timestamp;
 862             asf_st->pkt.stream_index = asf->stream_index;
 863             asf_st->pkt.pos =
 864             asf_st->packet_pos= asf->packet_pos;
 865 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 866 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 867 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 868             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 869                 asf->packet_key_frame = 1;
 870             if (asf->packet_key_frame)
 871                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 872         }
 873
 874         /* read data */
 875         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 876         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 877         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 878         asf->packet_size_left -= asf->packet_frag_size;
 879         if (asf->packet_size_left < 0)
 880             continue;
 881
 882         if(   asf->packet_frag_offset >= asf_st->pkt.size
 883            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 884             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 885                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 886             continue;
 887         }
 888
 889         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 890                    asf->packet_frag_size);
 891         if (s->key && s->keylen == 20)
 892             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 893                             asf->packet_frag_size);
 894         asf_st->frag_offset += asf->packet_frag_size;
 895         /* test if whole packet is read */
 896         if (asf_st->frag_offset == asf_st->pkt.size) {
 897             //workaround for macroshit radio DVR-MS files
 898             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 899                && asf_st->pkt.size > 100){
 900                 int i;
 901                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 902                 if(i == asf_st->pkt.size){
 903                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 904                     asf_st->frag_offset = 0;
 905                     av_free_packet(&asf_st->pkt);
 906                     continue;
 907                 }
 908             }
 909
 910             /* return packet */
 911             if (asf_st->ds_span > 1) {
 912               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 913                     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);
 914               }else{
 915                 /* packet descrambling */
 916                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 917                 if (newdata) {
 918                     int offset = 0;
 919                     while (offset < asf_st->pkt.size) {
 920                         int off = offset / asf_st->ds_chunk_size;
 921                         int row = off / asf_st->ds_span;
 922                         int col = off % asf_st->ds_span;
 923                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 924                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 925
 926                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 927                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 928                         memcpy(newdata + offset,
 929                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 930                                asf_st->ds_chunk_size);
 931                         offset += asf_st->ds_chunk_size;
 932                     }
 933                     av_free(asf_st->pkt.data);
 934                     asf_st->pkt.data = newdata;
 935                 }
 936               }
 937             }
 938             asf_st->frag_offset = 0;
 939             *pkt= asf_st->pkt;
 940             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 941             asf_st->pkt.size = 0;
 942             asf_st->pkt.data = 0;
 943             break; // packet completed
 944         }
 945     }
 946     return 0;
 947 }
 948
 949 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 950 {
 951     ASFContext *asf = s->priv_data;
 952
 953     for (;;) {
 954         int ret;
 955
 956         /* parse cached packets, if any */
 957         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 958             return ret;
 959         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 960             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 961         asf->packet_time_start = 0;
 962     }
 963
 964     return 0;
 965 }
 966
 967 // Added to support seeking after packets have been read
 968 // If information is not reset, read_packet fails due to
 969 // leftover information from previous reads
 970 static void asf_reset_header(AVFormatContext *s)
 971 {
 972     ASFContext *asf = s->priv_data;
 973     ASFStream *asf_st;
 974     int i;
 975
 976     asf->packet_nb_frames = 0;
 977     asf->packet_size_left = 0;
 978     asf->packet_segments = 0;
 979     asf->packet_flags = 0;
 980     asf->packet_property = 0;
 981     asf->packet_timestamp = 0;
 982     asf->packet_segsizetype = 0;
 983     asf->packet_segments = 0;
 984     asf->packet_seq = 0;
 985     asf->packet_replic_size = 0;
 986     asf->packet_key_frame = 0;
 987     asf->packet_padsize = 0;
 988     asf->packet_frag_offset = 0;
 989     asf->packet_frag_size = 0;
 990     asf->packet_frag_timestamp = 0;
 991     asf->packet_multi_size = 0;
 992     asf->packet_obj_size = 0;
 993     asf->packet_time_delta = 0;
 994     asf->packet_time_start = 0;
 995
 996     for(i=0; i<s->nb_streams; i++){
 997         asf_st= s->streams[i]->priv_data;
 998         av_free_packet(&asf_st->pkt);
 999         asf_st->frag_offset=0;
1000         asf_st->seq=0;
1001     }
1002     asf->asf_st= NULL;
1003 }
1004
1005 static int asf_read_close(AVFormatContext *s)
1006 {
1007     int i;
1008
1009     asf_reset_header(s);
1010     for(i=0;i<s->nb_streams;i++) {
1011         AVStream *st = s->streams[i];
1012         av_free(st->codec->palctrl);
1013     }
1014     return 0;
1015 }
1016
1017 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1018 {
1019     AVPacket pkt1, *pkt = &pkt1;
1020     ASFStream *asf_st;
1021     int64_t pts;
1022     int64_t pos= *ppos;
1023     int i;
1024     int64_t start_pos[s->nb_streams];
1025
1026     for(i=0; i<s->nb_streams; i++){
1027         start_pos[i]= pos;
1028     }
1029
1030     if (s->packet_size > 0)
1031         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1032     *ppos= pos;
1033     url_fseek(s->pb, pos, SEEK_SET);
1034
1035 //printf("asf_read_pts\n");
1036     asf_reset_header(s);
1037     for(;;){
1038         if (av_read_frame(s, pkt) < 0){
1039             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1040             return AV_NOPTS_VALUE;
1041         }
1042
1043         pts= pkt->pts;
1044
1045         av_free_packet(pkt);
1046         if(pkt->flags&PKT_FLAG_KEY){
1047             i= pkt->stream_index;
1048
1049             asf_st= s->streams[i]->priv_data;
1050
1051 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1052             pos= asf_st->packet_pos;
1053
1054             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1055             start_pos[i]= asf_st->packet_pos + 1;
1056
1057             if(pkt->stream_index == stream_index)
1058                break;
1059         }
1060     }
1061
1062     *ppos= pos;
1063 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1064
1065     return pts;
1066 }
1067
1068 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1069 {
1070     ff_asf_guid g;
1071     ASFContext *asf = s->priv_data;
1072     int64_t current_pos= url_ftell(s->pb);
1073     int i;
1074
1075     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1076     get_guid(s->pb, &g);
1077     if (!guidcmp(&g, &index_guid)) {
1078         int64_t itime, last_pos=-1;
1079         int pct, ict;
1080         int64_t av_unused gsize= get_le64(s->pb);
1081         get_guid(s->pb, &g);
1082         itime=get_le64(s->pb);
1083         pct=get_le32(s->pb);
1084         ict=get_le32(s->pb);
1085         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1086
1087         for (i=0;i<ict;i++){
1088             int pktnum=get_le32(s->pb);
1089             int pktct =get_le16(s->pb);
1090             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1091             int64_t index_pts= av_rescale(itime, i, 10000);
1092
1093             if(pos != last_pos){
1094             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1095             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1096             last_pos=pos;
1097             }
1098         }
1099         asf->index_read= 1;
1100     }
1101     url_fseek(s->pb, current_pos, SEEK_SET);
1102 }
1103
1104 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1105 {
1106     ASFContext *asf = s->priv_data;
1107     AVStream *st = s->streams[stream_index];
1108     int64_t pos;
1109     int index;
1110
1111     if (s->packet_size <= 0)
1112         return -1;
1113
1114     /* Try using the protocol's read_seek if available */
1115     if(s->pb) {
1116         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1117         if(ret >= 0)
1118             asf_reset_header(s);
1119         if (ret != AVERROR(ENOSYS))
1120             return ret;
1121     }
1122
1123     if (!asf->index_read)
1124         asf_build_simple_index(s, stream_index);
1125
1126     if(!(asf->index_read && st->index_entries)){
1127         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1128             return -1;
1129     }else{
1130         index= av_index_search_timestamp(st, pts, flags);
1131         if(index<0)
1132             return -1;
1133
1134         /* find the position */
1135         pos = st->index_entries[index].pos;
1136
1137     // various attempts to find key frame have failed so far
1138     //    asf_reset_header(s);
1139     //    url_fseek(s->pb, pos, SEEK_SET);
1140     //    key_pos = pos;
1141     //     for(i=0;i<16;i++){
1142     //         pos = url_ftell(s->pb);
1143     //         if (av_read_frame(s, &pkt) < 0){
1144     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1145     //             return -1;
1146     //         }
1147     //         asf_st = s->streams[stream_index]->priv_data;
1148     //         pos += st->parser->frame_offset;
1149     //
1150     //         if (pkt.size > b) {
1151     //             b = pkt.size;
1152     //             key_pos = pos;
1153     //         }
1154     //
1155     //         av_free_packet(&pkt);
1156     //     }
1157
1158         /* do the seek */
1159         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1160         url_fseek(s->pb, pos, SEEK_SET);
1161     }
1162     asf_reset_header(s);
1163     return 0;
1164 }
1165
1166 AVInputFormat asf_demuxer = {
1167     "asf",
1168     NULL_IF_CONFIG_SMALL("ASF format"),
1169     sizeof(ASFContext),
1170     asf_probe,
1171     asf_read_header,
1172     asf_read_packet,
1173     asf_read_close,
1174     asf_read_seek,
1175     asf_read_pts,
1176     .metadata_conv = ff_asf_metadata_conv,
1177 };