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 ASF_MAX_STREAMS 127
  39 #define FRAME_HEADER_SIZE 17
  40 // Fix Me! FRAME_HEADER_SIZE may be different.
  41
  42 static const ff_asf_guid index_guid = {
  43     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  44 };
  45
  46 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
  47     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  48 };
  49 /**********************************/
  50 /* decoding */
  51
  52 static int guidcmp(const void *g1, const void *g2)
  53 {
  54     return memcmp(g1, g2, sizeof(ff_asf_guid));
  55 }
  56
  57 #ifdef DEBUG
  58 #define PRINT_IF_GUID(g,cmp) \
  59 if (!guidcmp(g, &cmp)) \
  60     dprintf(NULL, "(GUID: %s) ", #cmp)
  61
  62 static void print_guid(const ff_asf_guid *g)
  63 {
  64     int i;
  65     PRINT_IF_GUID(g, ff_asf_header);
  66     else PRINT_IF_GUID(g, ff_asf_file_header);
  67     else PRINT_IF_GUID(g, ff_asf_stream_header);
  68     else PRINT_IF_GUID(g, ff_asf_audio_stream);
  69     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
  70     else PRINT_IF_GUID(g, ff_asf_video_stream);
  71     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
  72     else PRINT_IF_GUID(g, ff_asf_command_stream);
  73     else PRINT_IF_GUID(g, ff_asf_comment_header);
  74     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
  75     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
  76     else PRINT_IF_GUID(g, ff_asf_data_header);
  77     else PRINT_IF_GUID(g, index_guid);
  78     else PRINT_IF_GUID(g, ff_asf_head1_guid);
  79     else PRINT_IF_GUID(g, ff_asf_head2_guid);
  80     else PRINT_IF_GUID(g, ff_asf_my_guid);
  81     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
  82     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
  83     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
  84     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
  85     else PRINT_IF_GUID(g, ff_asf_metadata_header);
  86     else PRINT_IF_GUID(g, ff_asf_marker_header);
  87     else PRINT_IF_GUID(g, stream_bitrate_guid);
  88     else PRINT_IF_GUID(g, ff_asf_language_guid);
  89     else
  90         dprintf(NULL, "(GUID: unknown) ");
  91     for(i=0;i<16;i++)
  92         dprintf(NULL, " 0x%02x,", (*g)[i]);
  93     dprintf(NULL, "}\n");
  94 }
  95 #undef PRINT_IF_GUID
  96 #else
  97 #define print_guid(g)
  98 #endif
  99
 100 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
 101 {
 102     assert(sizeof(*g) == 16);
 103     get_buffer(s, *g, sizeof(*g));
 104 }
 105
 106 #if 0
 107 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
 108 {
 109     int len, c;
 110     char *q;
 111
 112     len = get_le16(pb);
 113     q = buf;
 114     while (len > 0) {
 115         c = get_le16(pb);
 116         if ((q - buf) < buf_size - 1)
 117             *q++ = c;
 118         len--;
 119     }
 120     *q = '\0';
 121 }
 122 #endif
 123
 124 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 125 {
 126     char* q = buf;
 127     while (len > 1) {
 128         uint8_t tmp;
 129         uint32_t ch;
 130
 131         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
 132         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 133     }
 134     if (len > 0)
 135         url_fskip(pb, len);
 136     *q = '\0';
 137 }
 138
 139 static int asf_probe(AVProbeData *pd)
 140 {
 141     /* check file header */
 142     if (!guidcmp(pd->buf, &ff_asf_header))
 143         return AVPROBE_SCORE_MAX;
 144     else
 145         return 0;
 146 }
 147
 148 static int get_value(ByteIOContext *pb, int type){
 149     switch(type){
 150         case 2: return get_le32(pb);
 151         case 3: return get_le32(pb);
 152         case 4: return get_le64(pb);
 153         case 5: return get_le16(pb);
 154         default:return INT_MIN;
 155     }
 156 }
 157
 158 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 159 {
 160     char *value;
 161
 162     if ((unsigned)len >= (UINT_MAX - 1)/2)
 163         return;
 164
 165     value = av_malloc(2*len+1);
 166     if (!value)
 167         return;
 168
 169     if (type == 0) {         // UTF16-LE
 170         get_str16_nolen(s->pb, len, value, 2*len + 1);
 171     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
 172         uint64_t num = get_value(s->pb, type);
 173         snprintf(value, len, "%"PRIu64, num);
 174     } else {
 175         url_fskip(s->pb, len);
 176         av_freep(&value);
 177         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
 178         return;
 179     }
 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         uint64_t gpos= url_ftell(pb);
 209         get_guid(pb, &g);
 210         gsize = get_le64(pb);
 211         dprintf(s, "%08"PRIx64": ", gpos);
 212         print_guid(&g);
 213         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 214         if (!guidcmp(&g, &ff_asf_data_header)) {
 215             asf->data_object_offset = url_ftell(pb);
 216             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 217             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 218                 asf->data_object_size = gsize - 24;
 219             } else {
 220                 asf->data_object_size = (uint64_t)-1;
 221             }
 222             break;
 223         }
 224         if (gsize < 24)
 225             return -1;
 226         if (!guidcmp(&g, &ff_asf_file_header)) {
 227             get_guid(pb, &asf->hdr.guid);
 228             asf->hdr.file_size          = get_le64(pb);
 229             asf->hdr.create_time        = get_le64(pb);
 230             asf->nb_packets             = get_le64(pb);
 231             asf->hdr.play_time          = get_le64(pb);
 232             asf->hdr.send_time          = get_le64(pb);
 233             asf->hdr.preroll            = get_le32(pb);
 234             asf->hdr.ignore             = get_le32(pb);
 235             asf->hdr.flags              = get_le32(pb);
 236             asf->hdr.min_pktsize        = get_le32(pb);
 237             asf->hdr.max_pktsize        = get_le32(pb);
 238             asf->hdr.max_bitrate        = get_le32(pb);
 239             s->packet_size = asf->hdr.max_pktsize;
 240         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
 241             enum AVMediaType type;
 242             int type_specific_size, sizeX;
 243             uint64_t total_size;
 244             unsigned int tag1;
 245             int64_t pos1, pos2, start_time;
 246             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 247
 248             if (s->nb_streams == ASF_MAX_STREAMS) {
 249                 av_log(s, AV_LOG_ERROR, "too many streams\n");
 250                 return AVERROR(EINVAL);
 251             }
 252
 253             pos1 = url_ftell(pb);
 254
 255             st = av_new_stream(s, 0);
 256             if (!st)
 257                 return AVERROR(ENOMEM);
 258             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 259             asf_st = av_mallocz(sizeof(ASFStream));
 260             if (!asf_st)
 261                 return AVERROR(ENOMEM);
 262             st->priv_data = asf_st;
 263             start_time = asf->hdr.preroll;
 264
 265             asf_st->stream_language_index = 128; // invalid stream index means no language info
 266
 267             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 268                 st->duration = asf->hdr.play_time /
 269                     (10000000 / 1000) - start_time;
 270             }
 271             get_guid(pb, &g);
 272
 273             test_for_ext_stream_audio = 0;
 274             if (!guidcmp(&g, &ff_asf_audio_stream)) {
 275                 type = AVMEDIA_TYPE_AUDIO;
 276             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
 277                 type = AVMEDIA_TYPE_VIDEO;
 278             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
 279                 type = AVMEDIA_TYPE_DATA;
 280             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 281                 test_for_ext_stream_audio = 1;
 282                 type = AVMEDIA_TYPE_UNKNOWN;
 283             } else {
 284                 return -1;
 285             }
 286             get_guid(pb, &g);
 287             total_size = get_le64(pb);
 288             type_specific_size = get_le32(pb);
 289             get_le32(pb);
 290             st->id = get_le16(pb) & 0x7f; /* stream id */
 291             // mapping of asf ID to AV stream ID;
 292             asf->asfid2avid[st->id] = s->nb_streams - 1;
 293
 294             get_le32(pb);
 295
 296             if (test_for_ext_stream_audio) {
 297                 get_guid(pb, &g);
 298                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 299                     type = AVMEDIA_TYPE_AUDIO;
 300                     is_dvr_ms_audio=1;
 301                     get_guid(pb, &g);
 302                     get_le32(pb);
 303                     get_le32(pb);
 304                     get_le32(pb);
 305                     get_guid(pb, &g);
 306                     get_le32(pb);
 307                 }
 308             }
 309
 310             st->codec->codec_type = type;
 311             if (type == AVMEDIA_TYPE_AUDIO) {
 312                 ff_get_wav_header(pb, st->codec, type_specific_size);
 313                 if (is_dvr_ms_audio) {
 314                     // codec_id and codec_tag are unreliable in dvr_ms
 315                     // files. Set them later by probing stream.
 316                     st->codec->codec_id = CODEC_ID_PROBE;
 317                     st->codec->codec_tag = 0;
 318                 }
 319                 if (st->codec->codec_id == CODEC_ID_AAC) {
 320                     st->need_parsing = AVSTREAM_PARSE_NONE;
 321                 } else {
 322                     st->need_parsing = AVSTREAM_PARSE_FULL;
 323                 }
 324                 /* We have to init the frame size at some point .... */
 325                 pos2 = url_ftell(pb);
 326                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 327                     asf_st->ds_span = get_byte(pb);
 328                     asf_st->ds_packet_size = get_le16(pb);
 329                     asf_st->ds_chunk_size = get_le16(pb);
 330                     get_le16(pb); //ds_data_size
 331                     get_byte(pb); //ds_silence_data
 332                 }
 333                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 334                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 335                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 336                 if (asf_st->ds_span > 1) {
 337                     if (!asf_st->ds_chunk_size
 338                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 339                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 340                         asf_st->ds_span = 0; // disable descrambling
 341                 }
 342                 switch (st->codec->codec_id) {
 343                 case CODEC_ID_MP3:
 344                     st->codec->frame_size = MPA_FRAME_SIZE;
 345                     break;
 346                 case CODEC_ID_PCM_S16LE:
 347                 case CODEC_ID_PCM_S16BE:
 348                 case CODEC_ID_PCM_U16LE:
 349                 case CODEC_ID_PCM_U16BE:
 350                 case CODEC_ID_PCM_S8:
 351                 case CODEC_ID_PCM_U8:
 352                 case CODEC_ID_PCM_ALAW:
 353                 case CODEC_ID_PCM_MULAW:
 354                     st->codec->frame_size = 1;
 355                     break;
 356                 default:
 357                     /* This is probably wrong, but it prevents a crash later */
 358                     st->codec->frame_size = 1;
 359                     break;
 360                 }
 361             } else if (type == AVMEDIA_TYPE_VIDEO) {
 362                 get_le32(pb);
 363                 get_le32(pb);
 364                 get_byte(pb);
 365                 size = get_le16(pb); /* size */
 366                 sizeX= get_le32(pb); /* size */
 367                 st->codec->width = get_le32(pb);
 368                 st->codec->height = get_le32(pb);
 369                 /* not available for asf */
 370                 get_le16(pb); /* panes */
 371                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 372                 tag1 = get_le32(pb);
 373                 url_fskip(pb, 20);
 374 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 375                 size= sizeX;
 376                 if (size > 40) {
 377                     st->codec->extradata_size = size - 40;
 378                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 379                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 380                 }
 381
 382                 /* Extract palette from extradata if bpp <= 8 */
 383                 /* This code assumes that extradata contains only palette */
 384                 /* This is true for all paletted codecs implemented in ffmpeg */
 385                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 386                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 387 #if HAVE_BIGENDIAN
 388                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 389                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
 390 #else
 391                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 392                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 393 #endif
 394                     st->codec->palctrl->palette_changed = 1;
 395                 }
 396
 397                 st->codec->codec_tag = tag1;
 398                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
 399                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
 400                     st->need_parsing = AVSTREAM_PARSE_FULL;
 401                     // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
 402                     st->codec->width  =
 403                     st->codec->height = 0;
 404                     av_freep(&st->codec->extradata);
 405                     st->codec->extradata_size=0;
 406                 }
 407                 if(st->codec->codec_id == CODEC_ID_H264)
 408                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
 409             }
 410             pos2 = url_ftell(pb);
 411             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 412         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
 413             int len1, len2, len3, len4, len5;
 414
 415             len1 = get_le16(pb);
 416             len2 = get_le16(pb);
 417             len3 = get_le16(pb);
 418             len4 = get_le16(pb);
 419             len5 = get_le16(pb);
 420             get_tag(s, "title"    , 0, len1);
 421             get_tag(s, "author"   , 0, len2);
 422             get_tag(s, "copyright", 0, len3);
 423             get_tag(s, "comment"  , 0, len4);
 424             url_fskip(pb, len5);
 425         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
 426             int stream_count = get_le16(pb);
 427             int j;
 428
 429 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 430 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 431             for(j = 0; j < stream_count; j++) {
 432                 int flags, bitrate, stream_id;
 433
 434                 flags= get_le16(pb);
 435                 bitrate= get_le32(pb);
 436                 stream_id= (flags & 0x7f);
 437 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 438                 asf->stream_bitrates[stream_id]= bitrate;
 439             }
 440         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
 441             int j;
 442             int stream_count = get_le16(pb);
 443             for(j = 0; j < stream_count; j++) {
 444                 char lang[6];
 445                 unsigned int lang_len = get_byte(pb);
 446                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
 447                 if (j < 128)
 448                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 449             }
 450         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
 451             int desc_count, i;
 452
 453             desc_count = get_le16(pb);
 454             for(i=0;i<desc_count;i++) {
 455                     int name_len,value_type,value_len;
 456                     char name[1024];
 457
 458                     name_len = get_le16(pb);
 459                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 460                         name_len += 1;
 461                     get_str16_nolen(pb, name_len, name, sizeof(name));
 462                     value_type = get_le16(pb);
 463                     value_len  = get_le16(pb);
 464                     if (!value_type && value_len%2)
 465                         value_len += 1;
 466                     get_tag(s, name, value_type, value_len);
 467             }
 468         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
 469             int n, stream_num, name_len, value_len, value_type, value_num;
 470             n = get_le16(pb);
 471
 472             for(i=0;i<n;i++) {
 473                 char name[1024];
 474
 475                 get_le16(pb); //lang_list_index
 476                 stream_num= get_le16(pb);
 477                 name_len=   get_le16(pb);
 478                 value_type= get_le16(pb);
 479                 value_len=  get_le32(pb);
 480
 481                 get_str16_nolen(pb, name_len, name, sizeof(name));
 482 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 483                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 484                 url_fskip(pb, value_len - 2);
 485
 486                 if(stream_num<128){
 487                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 488                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 489                 }
 490             }
 491         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
 492             int ext_len, payload_ext_ct, stream_ct;
 493             uint32_t ext_d, leak_rate, stream_num;
 494             unsigned int stream_languageid_index;
 495
 496             get_le64(pb); // starttime
 497             get_le64(pb); // endtime
 498             leak_rate = get_le32(pb); // leak-datarate
 499             get_le32(pb); // bucket-datasize
 500             get_le32(pb); // init-bucket-fullness
 501             get_le32(pb); // alt-leak-datarate
 502             get_le32(pb); // alt-bucket-datasize
 503             get_le32(pb); // alt-init-bucket-fullness
 504             get_le32(pb); // max-object-size
 505             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 506             stream_num = get_le16(pb); // stream-num
 507
 508             stream_languageid_index = get_le16(pb); // stream-language-id-index
 509             if (stream_num < 128)
 510                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 511
 512             get_le64(pb); // avg frametime in 100ns units
 513             stream_ct = get_le16(pb); //stream-name-count
 514             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 515
 516             if (stream_num < 128)
 517                 bitrate[stream_num] = leak_rate;
 518
 519             for (i=0; i<stream_ct; i++){
 520                 get_le16(pb);
 521                 ext_len = get_le16(pb);
 522                 url_fseek(pb, ext_len, SEEK_CUR);
 523             }
 524
 525             for (i=0; i<payload_ext_ct; i++){
 526                 get_guid(pb, &g);
 527                 ext_d=get_le16(pb);
 528                 ext_len=get_le32(pb);
 529                 url_fseek(pb, ext_len, SEEK_CUR);
 530             }
 531
 532             // there could be a optional stream properties object to follow
 533             // if so the next iteration will pick it up
 534             continue;
 535         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
 536             int v1, v2;
 537             get_guid(pb, &g);
 538             v1 = get_le32(pb);
 539             v2 = get_le16(pb);
 540             continue;
 541         } else if (!guidcmp(&g, &ff_asf_marker_header)) {
 542             int i, count, name_len;
 543             char name[1024];
 544
 545             get_le64(pb);            // reserved 16 bytes
 546             get_le64(pb);            // ...
 547             count = get_le32(pb);    // markers count
 548             get_le16(pb);            // reserved 2 bytes
 549             name_len = get_le16(pb); // name length
 550             for(i=0;i<name_len;i++){
 551                 get_byte(pb); // skip the name
 552             }
 553
 554             for(i=0;i<count;i++){
 555                 int64_t pres_time;
 556                 int name_len;
 557
 558                 get_le64(pb);             // offset, 8 bytes
 559                 pres_time = get_le64(pb); // presentation time
 560                 get_le16(pb);             // entry length
 561                 get_le32(pb);             // send time
 562                 get_le32(pb);             // flags
 563                 name_len = get_le32(pb);  // name length
 564                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
 565                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
 566             }
 567 #if 0
 568         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
 569             int len, v1, n, num;
 570             char str[256], *q;
 571             char tag[16];
 572
 573             get_guid(pb, &g);
 574             print_guid(&g);
 575
 576             n = get_le32(pb);
 577             for(i=0;i<n;i++) {
 578                 num = get_le16(pb); /* stream number */
 579                 get_str16(pb, str, sizeof(str));
 580                 get_str16(pb, str, sizeof(str));
 581                 len = get_le16(pb);
 582                 q = tag;
 583                 while (len > 0) {
 584                     v1 = get_byte(pb);
 585                     if ((q - tag) < sizeof(tag) - 1)
 586                         *q++ = v1;
 587                     len--;
 588                 }
 589                 *q = '\0';
 590             }
 591 #endif
 592         } else if (url_feof(pb)) {
 593             return -1;
 594         } else {
 595             if (!s->keylen) {
 596                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
 597                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 598                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
 599                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 600                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
 601                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 602                 }
 603             }
 604         }
 605         if(url_ftell(pb) != gpos + gsize)
 606             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
 607         url_fseek(pb, gpos + gsize, SEEK_SET);
 608     }
 609     get_guid(pb, &g);
 610     get_le64(pb);
 611     get_byte(pb);
 612     get_byte(pb);
 613     if (url_feof(pb))
 614         return -1;
 615     asf->data_offset = url_ftell(pb);
 616     asf->packet_size_left = 0;
 617
 618
 619     for(i=0; i<128; i++){
 620         int stream_num= asf->asfid2avid[i];
 621         if(stream_num>=0){
 622             AVStream *st = s->streams[stream_num];
 623             if (!st->codec->bit_rate)
 624                 st->codec->bit_rate = bitrate[i];
 625             if (dar[i].num > 0 && dar[i].den > 0)
 626                 av_reduce(&st->sample_aspect_ratio.num,
 627                           &st->sample_aspect_ratio.den,
 628                           dar[i].num, dar[i].den, INT_MAX);
 629 //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);
 630
 631             // copy and convert language codes to the frontend
 632             if (asf->streams[i].stream_language_index < 128) {
 633                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 634                 if (rfc1766 && strlen(rfc1766) > 1) {
 635                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 636                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 637                     if (iso6392)
 638                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
 639                 }
 640             }
 641         }
 642     }
 643
 644     return 0;
 645 }
 646
 647 #define DO_2BITS(bits, var, defval) \
 648     switch (bits & 3) \
 649     { \
 650     case 3: var = get_le32(pb); rsize += 4; break; \
 651     case 2: var = get_le16(pb); rsize += 2; break; \
 652     case 1: var = get_byte(pb); rsize++; break; \
 653     default: var = defval; break; \
 654     }
 655
 656 /**
 657  * Load a single ASF packet into the demuxer.
 658  * @param s demux context
 659  * @param pb context to read data from
 660  * @return 0 on success, <0 on error
 661  */
 662 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 663 {
 664     ASFContext *asf = s->priv_data;
 665     uint32_t packet_length, padsize;
 666     int rsize = 8;
 667     int c, d, e, off;
 668
 669     // if we do not know packet size, allow skipping up to 32 kB
 670     off= 32768;
 671     if (s->packet_size > 0)
 672         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 673
 674     c=d=e=-1;
 675     while(off-- > 0){
 676         c=d; d=e;
 677         e= get_byte(pb);
 678         if(c == 0x82 && !d && !e)
 679             break;
 680     }
 681
 682     if (c != 0x82) {
 683         /**
 684          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 685          * if the packet sync code above triggers -EAGAIN). This does not
 686          * imply complete -EAGAIN handling support at random positions in
 687          * the stream.
 688          */
 689         if (url_ferror(pb) == AVERROR(EAGAIN))
 690             return AVERROR(EAGAIN);
 691         if (!url_feof(pb))
 692             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 693     }
 694     if ((c & 0x8f) == 0x82) {
 695         if (d || e) {
 696             if (!url_feof(pb))
 697                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 698             return -1;
 699         }
 700         c= get_byte(pb);
 701         d= get_byte(pb);
 702         rsize+=3;
 703     }else{
 704         url_fseek(pb, -1, SEEK_CUR); //FIXME
 705     }
 706
 707     asf->packet_flags    = c;
 708     asf->packet_property = d;
 709
 710     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 711     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 712     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 713
 714     //the following checks prevent overflows and infinite loops
 715     if(!packet_length || packet_length >= (1U<<29)){
 716         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 717         return -1;
 718     }
 719     if(padsize >= packet_length){
 720         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 721         return -1;
 722     }
 723
 724     asf->packet_timestamp = get_le32(pb);
 725     get_le16(pb); /* duration */
 726     // rsize has at least 11 bytes which have to be present
 727
 728     if (asf->packet_flags & 0x01) {
 729         asf->packet_segsizetype = get_byte(pb); rsize++;
 730         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 731     } else {
 732         asf->packet_segments = 1;
 733         asf->packet_segsizetype = 0x80;
 734     }
 735     asf->packet_size_left = packet_length - padsize - rsize;
 736     if (packet_length < asf->hdr.min_pktsize)
 737         padsize += asf->hdr.min_pktsize - packet_length;
 738     asf->packet_padsize = padsize;
 739     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 740     return 0;
 741 }
 742
 743 /**
 744  *
 745  * @return <0 if error
 746  */
 747 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 748     ASFContext *asf = s->priv_data;
 749     int rsize = 1;
 750     int num = get_byte(pb);
 751     int64_t ts0, ts1;
 752
 753     asf->packet_segments--;
 754     asf->packet_key_frame = num >> 7;
 755     asf->stream_index = asf->asfid2avid[num & 0x7f];
 756     // sequence should be ignored!
 757     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 758     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 759     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 760 //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);
 761     if (asf->packet_replic_size >= 8) {
 762         asf->packet_obj_size = get_le32(pb);
 763         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 764             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 765             return -1;
 766         }
 767         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 768         if(asf->packet_replic_size >= 8+38+4){
 769 //            for(i=0; i<asf->packet_replic_size-8; i++)
 770 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 771 //            av_log(s, AV_LOG_DEBUG, "\n");
 772             url_fskip(pb, 10);
 773             ts0= get_le64(pb);
 774             ts1= get_le64(pb);
 775             url_fskip(pb, 12);
 776             get_le32(pb);
 777             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 778             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 779             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 780         }else
 781             url_fskip(pb, asf->packet_replic_size - 8);
 782         rsize += asf->packet_replic_size; // FIXME - check validity
 783     } else if (asf->packet_replic_size==1){
 784         // multipacket - frag_offset is beginning timestamp
 785         asf->packet_time_start = asf->packet_frag_offset;
 786         asf->packet_frag_offset = 0;
 787         asf->packet_frag_timestamp = asf->packet_timestamp;
 788
 789         asf->packet_time_delta = get_byte(pb);
 790         rsize++;
 791     }else if(asf->packet_replic_size!=0){
 792         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 793         return -1;
 794     }
 795     if (asf->packet_flags & 0x01) {
 796         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 797         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 798             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 799             return -1;
 800         }
 801         //printf("Fragsize %d\n", asf->packet_frag_size);
 802     } else {
 803         asf->packet_frag_size = asf->packet_size_left - rsize;
 804         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 805     }
 806     if (asf->packet_replic_size == 1) {
 807         asf->packet_multi_size = asf->packet_frag_size;
 808         if (asf->packet_multi_size > asf->packet_size_left)
 809             return -1;
 810     }
 811     asf->packet_size_left -= rsize;
 812     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 813
 814     return 0;
 815 }
 816
 817 /**
 818  * Parse data from individual ASF packets (which were previously loaded
 819  * with asf_get_packet()).
 820  * @param s demux context
 821  * @param pb context to read data from
 822  * @param pkt pointer to store packet data into
 823  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
 824  *          packets need to be loaded (through asf_get_packet())
 825  */
 826 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 827 {
 828     ASFContext *asf = s->priv_data;
 829     ASFStream *asf_st = 0;
 830     for (;;) {
 831         if(url_feof(pb))
 832             return AVERROR_EOF;
 833         if (asf->packet_size_left < FRAME_HEADER_SIZE
 834             || asf->packet_segments < 1) {
 835             //asf->packet_size_left <= asf->packet_padsize) {
 836             int ret = asf->packet_size_left + asf->packet_padsize;
 837             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 838             assert(ret>=0);
 839             /* fail safe */
 840             url_fskip(pb, ret);
 841
 842             asf->packet_pos= url_ftell(pb);
 843             if (asf->data_object_size != (uint64_t)-1 &&
 844                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 845                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 846             return 1;
 847         }
 848         if (asf->packet_time_start == 0) {
 849             if(asf_read_frame_header(s, pb) < 0){
 850                 asf->packet_segments= 0;
 851                 continue;
 852             }
 853             if (asf->stream_index < 0
 854                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 855                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 856                 ) {
 857                 asf->packet_time_start = 0;
 858                 /* unhandled packet (should not happen) */
 859                 url_fskip(pb, asf->packet_frag_size);
 860                 asf->packet_size_left -= asf->packet_frag_size;
 861                 if(asf->stream_index < 0)
 862                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 863                 continue;
 864             }
 865             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 866         }
 867         asf_st = asf->asf_st;
 868
 869         if (asf->packet_replic_size == 1) {
 870             // frag_offset is here used as the beginning timestamp
 871             asf->packet_frag_timestamp = asf->packet_time_start;
 872             asf->packet_time_start += asf->packet_time_delta;
 873             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 874             asf->packet_size_left--;
 875             asf->packet_multi_size--;
 876             if (asf->packet_multi_size < asf->packet_obj_size)
 877             {
 878                 asf->packet_time_start = 0;
 879                 url_fskip(pb, asf->packet_multi_size);
 880                 asf->packet_size_left -= asf->packet_multi_size;
 881                 continue;
 882             }
 883             asf->packet_multi_size -= asf->packet_obj_size;
 884             //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);
 885         }
 886         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 887               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 888            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 889             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 890                 asf_st->frag_offset, asf->packet_frag_size,
 891                 asf->packet_obj_size, asf_st->pkt.size);
 892             asf->packet_obj_size= asf_st->pkt.size;
 893         }
 894
 895         if (   asf_st->pkt.size != asf->packet_obj_size
 896             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 897             if(asf_st->pkt.data){
 898                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 899                 asf_st->frag_offset = 0;
 900                 av_free_packet(&asf_st->pkt);
 901             }
 902             /* new packet */
 903             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 904             asf_st->seq = asf->packet_seq;
 905             asf_st->pkt.dts = asf->packet_frag_timestamp;
 906             asf_st->pkt.stream_index = asf->stream_index;
 907             asf_st->pkt.pos =
 908             asf_st->packet_pos= asf->packet_pos;
 909 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 910 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
 911 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
 912             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 913                 asf->packet_key_frame = 1;
 914             if (asf->packet_key_frame)
 915                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
 916         }
 917
 918         /* read data */
 919         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 920         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 921         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 922         asf->packet_size_left -= asf->packet_frag_size;
 923         if (asf->packet_size_left < 0)
 924             continue;
 925
 926         if(   asf->packet_frag_offset >= asf_st->pkt.size
 927            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 928             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 929                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 930             continue;
 931         }
 932
 933         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 934                    asf->packet_frag_size);
 935         if (s->key && s->keylen == 20)
 936             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 937                             asf->packet_frag_size);
 938         asf_st->frag_offset += asf->packet_frag_size;
 939         /* test if whole packet is read */
 940         if (asf_st->frag_offset == asf_st->pkt.size) {
 941             //workaround for macroshit radio DVR-MS files
 942             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 943                && asf_st->pkt.size > 100){
 944                 int i;
 945                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 946                 if(i == asf_st->pkt.size){
 947                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 948                     asf_st->frag_offset = 0;
 949                     av_free_packet(&asf_st->pkt);
 950                     continue;
 951                 }
 952             }
 953
 954             /* return packet */
 955             if (asf_st->ds_span > 1) {
 956               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 957                     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);
 958               }else{
 959                 /* packet descrambling */
 960                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 961                 if (newdata) {
 962                     int offset = 0;
 963                     while (offset < asf_st->pkt.size) {
 964                         int off = offset / asf_st->ds_chunk_size;
 965                         int row = off / asf_st->ds_span;
 966                         int col = off % asf_st->ds_span;
 967                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 968                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 969
 970                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 971                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 972                         memcpy(newdata + offset,
 973                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 974                                asf_st->ds_chunk_size);
 975                         offset += asf_st->ds_chunk_size;
 976                     }
 977                     av_free(asf_st->pkt.data);
 978                     asf_st->pkt.data = newdata;
 979                 }
 980               }
 981             }
 982             asf_st->frag_offset = 0;
 983             *pkt= asf_st->pkt;
 984             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 985             asf_st->pkt.size = 0;
 986             asf_st->pkt.data = 0;
 987             break; // packet completed
 988         }
 989     }
 990     return 0;
 991 }
 992
 993 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 994 {
 995     ASFContext *asf = s->priv_data;
 996
 997     for (;;) {
 998         int ret;
 999
1000         /* parse cached packets, if any */
1001         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1002             return ret;
1003         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1004             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1005         asf->packet_time_start = 0;
1006     }
1007
1008     return 0;
1009 }
1010
1011 // Added to support seeking after packets have been read
1012 // If information is not reset, read_packet fails due to
1013 // leftover information from previous reads
1014 static void asf_reset_header(AVFormatContext *s)
1015 {
1016     ASFContext *asf = s->priv_data;
1017     ASFStream *asf_st;
1018     int i;
1019
1020     asf->packet_nb_frames = 0;
1021     asf->packet_size_left = 0;
1022     asf->packet_segments = 0;
1023     asf->packet_flags = 0;
1024     asf->packet_property = 0;
1025     asf->packet_timestamp = 0;
1026     asf->packet_segsizetype = 0;
1027     asf->packet_segments = 0;
1028     asf->packet_seq = 0;
1029     asf->packet_replic_size = 0;
1030     asf->packet_key_frame = 0;
1031     asf->packet_padsize = 0;
1032     asf->packet_frag_offset = 0;
1033     asf->packet_frag_size = 0;
1034     asf->packet_frag_timestamp = 0;
1035     asf->packet_multi_size = 0;
1036     asf->packet_obj_size = 0;
1037     asf->packet_time_delta = 0;
1038     asf->packet_time_start = 0;
1039
1040     for(i=0; i<s->nb_streams; i++){
1041         asf_st= s->streams[i]->priv_data;
1042         av_free_packet(&asf_st->pkt);
1043         asf_st->frag_offset=0;
1044         asf_st->seq=0;
1045     }
1046     asf->asf_st= NULL;
1047 }
1048
1049 static int asf_read_close(AVFormatContext *s)
1050 {
1051     int i;
1052
1053     asf_reset_header(s);
1054     for(i=0;i<s->nb_streams;i++) {
1055         AVStream *st = s->streams[i];
1056         av_free(st->codec->palctrl);
1057     }
1058     return 0;
1059 }
1060
1061 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1062 {
1063     AVPacket pkt1, *pkt = &pkt1;
1064     ASFStream *asf_st;
1065     int64_t pts;
1066     int64_t pos= *ppos;
1067     int i;
1068     int64_t start_pos[ASF_MAX_STREAMS];
1069
1070     for(i=0; i<s->nb_streams; i++){
1071         start_pos[i]= pos;
1072     }
1073
1074     if (s->packet_size > 0)
1075         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1076     *ppos= pos;
1077     url_fseek(s->pb, pos, SEEK_SET);
1078
1079 //printf("asf_read_pts\n");
1080     asf_reset_header(s);
1081     for(;;){
1082         if (av_read_frame(s, pkt) < 0){
1083             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1084             return AV_NOPTS_VALUE;
1085         }
1086
1087         pts= pkt->pts;
1088
1089         av_free_packet(pkt);
1090         if(pkt->flags&AV_PKT_FLAG_KEY){
1091             i= pkt->stream_index;
1092
1093             asf_st= s->streams[i]->priv_data;
1094
1095 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1096             pos= asf_st->packet_pos;
1097
1098             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1099             start_pos[i]= asf_st->packet_pos + 1;
1100
1101             if(pkt->stream_index == stream_index)
1102                break;
1103         }
1104     }
1105
1106     *ppos= pos;
1107 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1108
1109     return pts;
1110 }
1111
1112 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1113 {
1114     ff_asf_guid g;
1115     ASFContext *asf = s->priv_data;
1116     int64_t current_pos= url_ftell(s->pb);
1117     int i;
1118
1119     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1120     get_guid(s->pb, &g);
1121     if (!guidcmp(&g, &index_guid)) {
1122         int64_t itime, last_pos=-1;
1123         int pct, ict;
1124         int64_t av_unused gsize= get_le64(s->pb);
1125         get_guid(s->pb, &g);
1126         itime=get_le64(s->pb);
1127         pct=get_le32(s->pb);
1128         ict=get_le32(s->pb);
1129         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1130
1131         for (i=0;i<ict;i++){
1132             int pktnum=get_le32(s->pb);
1133             int pktct =get_le16(s->pb);
1134             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1135             int64_t index_pts= av_rescale(itime, i, 10000);
1136
1137             if(pos != last_pos){
1138             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1139             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1140             last_pos=pos;
1141             }
1142         }
1143         asf->index_read= 1;
1144     }
1145     url_fseek(s->pb, current_pos, SEEK_SET);
1146 }
1147
1148 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1149 {
1150     ASFContext *asf = s->priv_data;
1151     AVStream *st = s->streams[stream_index];
1152     int64_t pos;
1153     int index;
1154
1155     if (s->packet_size <= 0)
1156         return -1;
1157
1158     /* Try using the protocol's read_seek if available */
1159     if(s->pb) {
1160         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1161         if(ret >= 0)
1162             asf_reset_header(s);
1163         if (ret != AVERROR(ENOSYS))
1164             return ret;
1165     }
1166
1167     if (!asf->index_read)
1168         asf_build_simple_index(s, stream_index);
1169
1170     if(!(asf->index_read && st->index_entries)){
1171         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1172             return -1;
1173     }else{
1174         index= av_index_search_timestamp(st, pts, flags);
1175         if(index<0)
1176             return -1;
1177
1178         /* find the position */
1179         pos = st->index_entries[index].pos;
1180
1181     // various attempts to find key frame have failed so far
1182     //    asf_reset_header(s);
1183     //    url_fseek(s->pb, pos, SEEK_SET);
1184     //    key_pos = pos;
1185     //     for(i=0;i<16;i++){
1186     //         pos = url_ftell(s->pb);
1187     //         if (av_read_frame(s, &pkt) < 0){
1188     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1189     //             return -1;
1190     //         }
1191     //         asf_st = s->streams[stream_index]->priv_data;
1192     //         pos += st->parser->frame_offset;
1193     //
1194     //         if (pkt.size > b) {
1195     //             b = pkt.size;
1196     //             key_pos = pos;
1197     //         }
1198     //
1199     //         av_free_packet(&pkt);
1200     //     }
1201
1202         /* do the seek */
1203         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1204         url_fseek(s->pb, pos, SEEK_SET);
1205     }
1206     asf_reset_header(s);
1207     return 0;
1208 }
1209
1210 AVInputFormat asf_demuxer = {
1211     "asf",
1212     NULL_IF_CONFIG_SMALL("ASF format"),
1213     sizeof(ASFContext),
1214     asf_probe,
1215     asf_read_header,
1216     asf_read_packet,
1217     asf_read_close,
1218     asf_read_seek,
1219     asf_read_pts,
1220     .metadata_conv = ff_asf_metadata_conv,
1221 };