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 typedef struct {
  36     int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID
  37     ASFStream streams[128];              ///< it's max number and it's not that big
  38     uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)
  39     AVRational dar[128];
  40     char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)
  41     /* non streamed additonnal info */
  42     /* packet filling */
  43     int packet_size_left;
  44     /* only for reading */
  45     uint64_t data_offset;                ///< beginning of the first data packet
  46     uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)
  47     uint64_t data_object_size;           ///< size of the data object
  48     int index_read;
  49
  50     ASFMainHeader hdr;
  51
  52     int packet_flags;
  53     int packet_property;
  54     int packet_timestamp;
  55     int packet_segsizetype;
  56     int packet_segments;
  57     int packet_seq;
  58     int packet_replic_size;
  59     int packet_key_frame;
  60     int packet_padsize;
  61     unsigned int packet_frag_offset;
  62     unsigned int packet_frag_size;
  63     int64_t packet_frag_timestamp;
  64     int packet_multi_size;
  65     int packet_obj_size;
  66     int packet_time_delta;
  67     int packet_time_start;
  68     int64_t packet_pos;
  69
  70     int stream_index;
  71
  72     ASFStream* asf_st;                   ///< currently decoded stream
  73 } ASFContext;
  74
  75 #undef NDEBUG
  76 #include <assert.h>
  77
  78 #define ASF_MAX_STREAMS 127
  79 #define FRAME_HEADER_SIZE 17
  80 // Fix Me! FRAME_HEADER_SIZE may be different.
  81
  82 static const ff_asf_guid index_guid = {
  83     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  84 };
  85
  86 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
  87     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  88 };
  89 /**********************************/
  90 /* decoding */
  91
  92 #ifdef DEBUG
  93 #define PRINT_IF_GUID(g,cmp) \
  94 if (!ff_guidcmp(g, &cmp)) \
  95     av_dlog(NULL, "(GUID: %s) ", #cmp)
  96
  97 static void print_guid(const ff_asf_guid *g)
  98 {
  99     int i;
 100     PRINT_IF_GUID(g, ff_asf_header);
 101     else PRINT_IF_GUID(g, ff_asf_file_header);
 102     else PRINT_IF_GUID(g, ff_asf_stream_header);
 103     else PRINT_IF_GUID(g, ff_asf_audio_stream);
 104     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
 105     else PRINT_IF_GUID(g, ff_asf_video_stream);
 106     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
 107     else PRINT_IF_GUID(g, ff_asf_command_stream);
 108     else PRINT_IF_GUID(g, ff_asf_comment_header);
 109     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
 110     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
 111     else PRINT_IF_GUID(g, ff_asf_data_header);
 112     else PRINT_IF_GUID(g, index_guid);
 113     else PRINT_IF_GUID(g, ff_asf_head1_guid);
 114     else PRINT_IF_GUID(g, ff_asf_head2_guid);
 115     else PRINT_IF_GUID(g, ff_asf_my_guid);
 116     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
 117     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
 118     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
 119     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
 120     else PRINT_IF_GUID(g, ff_asf_metadata_header);
 121     else PRINT_IF_GUID(g, ff_asf_marker_header);
 122     else PRINT_IF_GUID(g, stream_bitrate_guid);
 123     else PRINT_IF_GUID(g, ff_asf_language_guid);
 124     else
 125         av_dlog(NULL, "(GUID: unknown) ");
 126     for(i=0;i<16;i++)
 127         av_dlog(NULL, " 0x%02x,", (*g)[i]);
 128     av_dlog(NULL, "}\n");
 129 }
 130 #undef PRINT_IF_GUID
 131 #else
 132 #define print_guid(g)
 133 #endif
 134
 135 void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
 136 {
 137     assert(sizeof(*g) == 16);
 138     get_buffer(s, *g, sizeof(*g));
 139 }
 140
 141 static int asf_probe(AVProbeData *pd)
 142 {
 143     /* check file header */
 144     if (!ff_guidcmp(pd->buf, &ff_asf_header))
 145         return AVPROBE_SCORE_MAX;
 146     else
 147         return 0;
 148 }
 149
 150 static int get_value(ByteIOContext *pb, int type){
 151     switch(type){
 152         case 2: return get_le32(pb);
 153         case 3: return get_le32(pb);
 154         case 4: return get_le64(pb);
 155         case 5: return get_le16(pb);
 156         default:return INT_MIN;
 157     }
 158 }
 159
 160 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 161 {
 162     char *value;
 163     int64_t off = url_ftell(s->pb);
 164
 165     if ((unsigned)len >= (UINT_MAX - 1)/2)
 166         return;
 167
 168     value = av_malloc(2*len+1);
 169     if (!value)
 170         goto finish;
 171
 172     if (type == 0) {         // UTF16-LE
 173         avio_get_str16le(s->pb, len, value, 2*len + 1);
 174     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
 175         uint64_t num = get_value(s->pb, type);
 176         snprintf(value, len, "%"PRIu64, num);
 177     } else {
 178         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
 179         goto finish;
 180     }
 181     av_metadata_set2(&s->metadata, key, value, 0);
 182 finish:
 183     av_freep(&value);
 184     url_fseek(s->pb, off + len, SEEK_SET);
 185 }
 186
 187 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 188 {
 189     ASFContext *asf = s->priv_data;
 190     ff_asf_guid g;
 191     ByteIOContext *pb = s->pb;
 192     AVStream *st;
 193     ASFStream *asf_st;
 194     int size, i;
 195     int64_t gsize;
 196
 197     ff_get_guid(pb, &g);
 198     if (ff_guidcmp(&g, &ff_asf_header))
 199         return -1;
 200     get_le64(pb);
 201     get_le32(pb);
 202     get_byte(pb);
 203     get_byte(pb);
 204     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 205     for(;;) {
 206         uint64_t gpos= url_ftell(pb);
 207         int ret;
 208         ff_get_guid(pb, &g);
 209         gsize = get_le64(pb);
 210         av_dlog(s, "%08"PRIx64": ", gpos);
 211         print_guid(&g);
 212         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
 213         if (!ff_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 (!ff_guidcmp(&g, &ff_asf_file_header)) {
 226             ff_get_guid(pb, &asf->hdr.guid);
 227             asf->hdr.file_size          = get_le64(pb);
 228             asf->hdr.create_time        = get_le64(pb);
 229             get_le64(pb);                               /* number of packets */
 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 (!ff_guidcmp(&g, &ff_asf_stream_header)) {
 240             enum AVMediaType 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             if (s->nb_streams == ASF_MAX_STREAMS) {
 248                 av_log(s, AV_LOG_ERROR, "too many streams\n");
 249                 return AVERROR(EINVAL);
 250             }
 251
 252             pos1 = url_ftell(pb);
 253
 254             st = av_new_stream(s, 0);
 255             if (!st)
 256                 return AVERROR(ENOMEM);
 257             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 258             asf_st = av_mallocz(sizeof(ASFStream));
 259             if (!asf_st)
 260                 return AVERROR(ENOMEM);
 261             st->priv_data = asf_st;
 262             start_time = asf->hdr.preroll;
 263
 264             asf_st->stream_language_index = 128; // invalid stream index means no language info
 265
 266             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 267                 st->duration = asf->hdr.play_time /
 268                     (10000000 / 1000) - start_time;
 269             }
 270             ff_get_guid(pb, &g);
 271
 272             test_for_ext_stream_audio = 0;
 273             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
 274                 type = AVMEDIA_TYPE_AUDIO;
 275             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
 276                 type = AVMEDIA_TYPE_VIDEO;
 277             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
 278                 type = AVMEDIA_TYPE_VIDEO;
 279                 st->codec->codec_id = CODEC_ID_MJPEG;
 280             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
 281                 type = AVMEDIA_TYPE_DATA;
 282             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 283                 test_for_ext_stream_audio = 1;
 284                 type = AVMEDIA_TYPE_UNKNOWN;
 285             } else {
 286                 return -1;
 287             }
 288             ff_get_guid(pb, &g);
 289             total_size = get_le64(pb);
 290             type_specific_size = get_le32(pb);
 291             get_le32(pb);
 292             st->id = get_le16(pb) & 0x7f; /* stream id */
 293             // mapping of asf ID to AV stream ID;
 294             asf->asfid2avid[st->id] = s->nb_streams - 1;
 295
 296             get_le32(pb);
 297
 298             if (test_for_ext_stream_audio) {
 299                 ff_get_guid(pb, &g);
 300                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 301                     type = AVMEDIA_TYPE_AUDIO;
 302                     is_dvr_ms_audio=1;
 303                     ff_get_guid(pb, &g);
 304                     get_le32(pb);
 305                     get_le32(pb);
 306                     get_le32(pb);
 307                     ff_get_guid(pb, &g);
 308                     get_le32(pb);
 309                 }
 310             }
 311
 312             st->codec->codec_type = type;
 313             if (type == AVMEDIA_TYPE_AUDIO) {
 314                 ff_get_wav_header(pb, st->codec, type_specific_size);
 315                 if (is_dvr_ms_audio) {
 316                     // codec_id and codec_tag are unreliable in dvr_ms
 317                     // files. Set them later by probing stream.
 318                     st->codec->codec_id = CODEC_ID_PROBE;
 319                     st->codec->codec_tag = 0;
 320                 }
 321                 if (st->codec->codec_id == CODEC_ID_AAC) {
 322                     st->need_parsing = AVSTREAM_PARSE_NONE;
 323                 } else {
 324                     st->need_parsing = AVSTREAM_PARSE_FULL;
 325                 }
 326                 /* We have to init the frame size at some point .... */
 327                 pos2 = url_ftell(pb);
 328                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 329                     asf_st->ds_span = get_byte(pb);
 330                     asf_st->ds_packet_size = get_le16(pb);
 331                     asf_st->ds_chunk_size = get_le16(pb);
 332                     get_le16(pb); //ds_data_size
 333                     get_byte(pb); //ds_silence_data
 334                 }
 335                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 336                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 337                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 338                 if (asf_st->ds_span > 1) {
 339                     if (!asf_st->ds_chunk_size
 340                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 341                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 342                         asf_st->ds_span = 0; // disable descrambling
 343                 }
 344                 switch (st->codec->codec_id) {
 345                 case CODEC_ID_MP3:
 346                     st->codec->frame_size = MPA_FRAME_SIZE;
 347                     break;
 348                 case CODEC_ID_PCM_S16LE:
 349                 case CODEC_ID_PCM_S16BE:
 350                 case CODEC_ID_PCM_U16LE:
 351                 case CODEC_ID_PCM_U16BE:
 352                 case CODEC_ID_PCM_S8:
 353                 case CODEC_ID_PCM_U8:
 354                 case CODEC_ID_PCM_ALAW:
 355                 case CODEC_ID_PCM_MULAW:
 356                     st->codec->frame_size = 1;
 357                     break;
 358                 default:
 359                     /* This is probably wrong, but it prevents a crash later */
 360                     st->codec->frame_size = 1;
 361                     break;
 362                 }
 363             } else if (type == AVMEDIA_TYPE_VIDEO &&
 364                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
 365                 get_le32(pb);
 366                 get_le32(pb);
 367                 get_byte(pb);
 368                 size = get_le16(pb); /* size */
 369                 sizeX= get_le32(pb); /* size */
 370                 st->codec->width = get_le32(pb);
 371                 st->codec->height = get_le32(pb);
 372                 /* not available for asf */
 373                 get_le16(pb); /* panes */
 374                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 375                 tag1 = get_le32(pb);
 376                 url_fskip(pb, 20);
 377 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 378                 size= sizeX;
 379                 if (size > 40) {
 380                     st->codec->extradata_size = size - 40;
 381                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 382                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 383                 }
 384
 385                 /* Extract palette from extradata if bpp <= 8 */
 386                 /* This code assumes that extradata contains only palette */
 387                 /* This is true for all paletted codecs implemented in ffmpeg */
 388                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 389                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 390 #if HAVE_BIGENDIAN
 391                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 392                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
 393 #else
 394                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 395                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 396 #endif
 397                     st->codec->palctrl->palette_changed = 1;
 398                 }
 399
 400                 st->codec->codec_tag = tag1;
 401                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
 402                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
 403                     st->need_parsing = AVSTREAM_PARSE_FULL;
 404                     // 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
 405                     st->codec->width  =
 406                     st->codec->height = 0;
 407                     av_freep(&st->codec->extradata);
 408                     st->codec->extradata_size=0;
 409                 }
 410                 if(st->codec->codec_id == CODEC_ID_H264)
 411                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
 412             }
 413             pos2 = url_ftell(pb);
 414             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 415         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
 416             int len1, len2, len3, len4, len5;
 417
 418             len1 = get_le16(pb);
 419             len2 = get_le16(pb);
 420             len3 = get_le16(pb);
 421             len4 = get_le16(pb);
 422             len5 = get_le16(pb);
 423             get_tag(s, "title"    , 0, len1);
 424             get_tag(s, "author"   , 0, len2);
 425             get_tag(s, "copyright", 0, len3);
 426             get_tag(s, "comment"  , 0, len4);
 427             url_fskip(pb, len5);
 428         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
 429             int j;
 430             int stream_count = get_le16(pb);
 431             for(j = 0; j < stream_count; j++) {
 432                 char lang[6];
 433                 unsigned int lang_len = get_byte(pb);
 434                 if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
 435                     url_fskip(pb, lang_len - ret);
 436                 if (j < 128)
 437                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 438             }
 439         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
 440             int desc_count, i;
 441
 442             desc_count = get_le16(pb);
 443             for(i=0;i<desc_count;i++) {
 444                     int name_len,value_type,value_len;
 445                     char name[1024];
 446
 447                     name_len = get_le16(pb);
 448                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 449                         name_len += 1;
 450                     if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
 451                         url_fskip(pb, name_len - ret);
 452                     value_type = get_le16(pb);
 453                     value_len  = get_le16(pb);
 454                     if (!value_type && value_len%2)
 455                         value_len += 1;
 456                     /**
 457                      * My sample has that stream set to 0 maybe that mean the container.
 458                      * Asf stream count start at 1. I am using 0 to the container value since it's unused
 459                      */
 460                     if (!strcmp(name, "AspectRatioX")){
 461                         asf->dar[0].num= get_value(s->pb, value_type);
 462                     } else if(!strcmp(name, "AspectRatioY")){
 463                         asf->dar[0].den= get_value(s->pb, value_type);
 464                     } else
 465                         get_tag(s, name, value_type, value_len);
 466             }
 467         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
 468             int n, stream_num, name_len, value_len, value_type, value_num;
 469             n = get_le16(pb);
 470
 471             for(i=0;i<n;i++) {
 472                 char name[1024];
 473
 474                 get_le16(pb); //lang_list_index
 475                 stream_num= get_le16(pb);
 476                 name_len=   get_le16(pb);
 477                 value_type= get_le16(pb);
 478                 value_len=  get_le32(pb);
 479
 480                 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
 481                     url_fskip(pb, name_len - ret);
 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")) asf->dar[stream_num].num= value_num;
 488                     else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
 489                 }
 490             }
 491         } else if (!ff_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                 asf->stream_bitrates[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                 ff_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 (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
 536             int v1, v2;
 537             ff_get_guid(pb, &g);
 538             v1 = get_le32(pb);
 539             v2 = get_le16(pb);
 540             continue;
 541         } else if (!ff_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                 if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
 565                     url_fskip(pb, name_len - ret);
 566                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
 567             }
 568         } else if (url_feof(pb)) {
 569             return -1;
 570         } else {
 571             if (!s->keylen) {
 572                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
 573                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 574                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
 575                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 576                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
 577                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 578                 }
 579             }
 580         }
 581         if(url_ftell(pb) != gpos + gsize)
 582             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
 583         url_fseek(pb, gpos + gsize, SEEK_SET);
 584     }
 585     ff_get_guid(pb, &g);
 586     get_le64(pb);
 587     get_byte(pb);
 588     get_byte(pb);
 589     if (url_feof(pb))
 590         return -1;
 591     asf->data_offset = url_ftell(pb);
 592     asf->packet_size_left = 0;
 593
 594
 595     for(i=0; i<128; i++){
 596         int stream_num= asf->asfid2avid[i];
 597         if(stream_num>=0){
 598             AVStream *st = s->streams[stream_num];
 599             if (!st->codec->bit_rate)
 600                 st->codec->bit_rate = asf->stream_bitrates[i];
 601             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
 602                 av_reduce(&st->sample_aspect_ratio.num,
 603                           &st->sample_aspect_ratio.den,
 604                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
 605             } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
 606                 av_reduce(&st->sample_aspect_ratio.num,
 607                           &st->sample_aspect_ratio.den,
 608                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
 609
 610 //av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
 611
 612             // copy and convert language codes to the frontend
 613             if (asf->streams[i].stream_language_index < 128) {
 614                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 615                 if (rfc1766 && strlen(rfc1766) > 1) {
 616                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 617                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 618                     if (iso6392)
 619                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
 620                 }
 621             }
 622         }
 623     }
 624
 625     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 626
 627     return 0;
 628 }
 629
 630 #define DO_2BITS(bits, var, defval) \
 631     switch (bits & 3) \
 632     { \
 633     case 3: var = get_le32(pb); rsize += 4; break; \
 634     case 2: var = get_le16(pb); rsize += 2; break; \
 635     case 1: var = get_byte(pb); rsize++; break; \
 636     default: var = defval; break; \
 637     }
 638
 639 /**
 640  * Load a single ASF packet into the demuxer.
 641  * @param s demux context
 642  * @param pb context to read data from
 643  * @return 0 on success, <0 on error
 644  */
 645 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 646 {
 647     ASFContext *asf = s->priv_data;
 648     uint32_t packet_length, padsize;
 649     int rsize = 8;
 650     int c, d, e, off;
 651
 652     // if we do not know packet size, allow skipping up to 32 kB
 653     off= 32768;
 654     if (s->packet_size > 0)
 655         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 656
 657     c=d=e=-1;
 658     while(off-- > 0){
 659         c=d; d=e;
 660         e= get_byte(pb);
 661         if(c == 0x82 && !d && !e)
 662             break;
 663     }
 664
 665     if (c != 0x82) {
 666         /**
 667          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 668          * if the packet sync code above triggers -EAGAIN). This does not
 669          * imply complete -EAGAIN handling support at random positions in
 670          * the stream.
 671          */
 672         if (url_ferror(pb) == AVERROR(EAGAIN))
 673             return AVERROR(EAGAIN);
 674         if (!url_feof(pb))
 675             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 676     }
 677     if ((c & 0x8f) == 0x82) {
 678         if (d || e) {
 679             if (!url_feof(pb))
 680                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 681             return -1;
 682         }
 683         c= get_byte(pb);
 684         d= get_byte(pb);
 685         rsize+=3;
 686     }else{
 687         url_fseek(pb, -1, SEEK_CUR); //FIXME
 688     }
 689
 690     asf->packet_flags    = c;
 691     asf->packet_property = d;
 692
 693     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 694     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 695     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 696
 697     //the following checks prevent overflows and infinite loops
 698     if(!packet_length || packet_length >= (1U<<29)){
 699         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 700         return -1;
 701     }
 702     if(padsize >= packet_length){
 703         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 704         return -1;
 705     }
 706
 707     asf->packet_timestamp = get_le32(pb);
 708     get_le16(pb); /* duration */
 709     // rsize has at least 11 bytes which have to be present
 710
 711     if (asf->packet_flags & 0x01) {
 712         asf->packet_segsizetype = get_byte(pb); rsize++;
 713         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 714     } else {
 715         asf->packet_segments = 1;
 716         asf->packet_segsizetype = 0x80;
 717     }
 718     asf->packet_size_left = packet_length - padsize - rsize;
 719     if (packet_length < asf->hdr.min_pktsize)
 720         padsize += asf->hdr.min_pktsize - packet_length;
 721     asf->packet_padsize = padsize;
 722     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 723     return 0;
 724 }
 725
 726 /**
 727  *
 728  * @return <0 if error
 729  */
 730 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 731     ASFContext *asf = s->priv_data;
 732     int rsize = 1;
 733     int num = get_byte(pb);
 734     int64_t ts0, ts1;
 735
 736     asf->packet_segments--;
 737     asf->packet_key_frame = num >> 7;
 738     asf->stream_index = asf->asfid2avid[num & 0x7f];
 739     // sequence should be ignored!
 740     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 741     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 742     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 743 //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);
 744     if (asf->packet_replic_size >= 8) {
 745         asf->packet_obj_size = get_le32(pb);
 746         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 747             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 748             return -1;
 749         }
 750         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 751         if(asf->packet_replic_size >= 8+38+4){
 752 //            for(i=0; i<asf->packet_replic_size-8; i++)
 753 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 754 //            av_log(s, AV_LOG_DEBUG, "\n");
 755             url_fskip(pb, 10);
 756             ts0= get_le64(pb);
 757             ts1= get_le64(pb);
 758             url_fskip(pb, 12);
 759             get_le32(pb);
 760             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 761             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 762             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 763         }else
 764             url_fskip(pb, asf->packet_replic_size - 8);
 765         rsize += asf->packet_replic_size; // FIXME - check validity
 766     } else if (asf->packet_replic_size==1){
 767         // multipacket - frag_offset is beginning timestamp
 768         asf->packet_time_start = asf->packet_frag_offset;
 769         asf->packet_frag_offset = 0;
 770         asf->packet_frag_timestamp = asf->packet_timestamp;
 771
 772         asf->packet_time_delta = get_byte(pb);
 773         rsize++;
 774     }else if(asf->packet_replic_size!=0){
 775         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 776         return -1;
 777     }
 778     if (asf->packet_flags & 0x01) {
 779         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 780         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 781             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 782             return -1;
 783         }
 784         //printf("Fragsize %d\n", asf->packet_frag_size);
 785     } else {
 786         asf->packet_frag_size = asf->packet_size_left - rsize;
 787         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 788     }
 789     if (asf->packet_replic_size == 1) {
 790         asf->packet_multi_size = asf->packet_frag_size;
 791         if (asf->packet_multi_size > asf->packet_size_left)
 792             return -1;
 793     }
 794     asf->packet_size_left -= rsize;
 795     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 796
 797     return 0;
 798 }
 799
 800 /**
 801  * Parse data from individual ASF packets (which were previously loaded
 802  * with asf_get_packet()).
 803  * @param s demux context
 804  * @param pb context to read data from
 805  * @param pkt pointer to store packet data into
 806  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
 807  *          packets need to be loaded (through asf_get_packet())
 808  */
 809 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 810 {
 811     ASFContext *asf = s->priv_data;
 812     ASFStream *asf_st = 0;
 813     for (;;) {
 814         int ret;
 815         if(url_feof(pb))
 816             return AVERROR_EOF;
 817         if (asf->packet_size_left < FRAME_HEADER_SIZE
 818             || asf->packet_segments < 1) {
 819             //asf->packet_size_left <= asf->packet_padsize) {
 820             int ret = asf->packet_size_left + asf->packet_padsize;
 821             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 822             assert(ret>=0);
 823             /* fail safe */
 824             url_fskip(pb, ret);
 825
 826             asf->packet_pos= url_ftell(pb);
 827             if (asf->data_object_size != (uint64_t)-1 &&
 828                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 829                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 830             return 1;
 831         }
 832         if (asf->packet_time_start == 0) {
 833             if(asf_read_frame_header(s, pb) < 0){
 834                 asf->packet_segments= 0;
 835                 continue;
 836             }
 837             if (asf->stream_index < 0
 838                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 839                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 840                 ) {
 841                 asf->packet_time_start = 0;
 842                 /* unhandled packet (should not happen) */
 843                 url_fskip(pb, asf->packet_frag_size);
 844                 asf->packet_size_left -= asf->packet_frag_size;
 845                 if(asf->stream_index < 0)
 846                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 847                 continue;
 848             }
 849             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 850         }
 851         asf_st = asf->asf_st;
 852
 853         if (asf->packet_replic_size == 1) {
 854             // frag_offset is here used as the beginning timestamp
 855             asf->packet_frag_timestamp = asf->packet_time_start;
 856             asf->packet_time_start += asf->packet_time_delta;
 857             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 858             asf->packet_size_left--;
 859             asf->packet_multi_size--;
 860             if (asf->packet_multi_size < asf->packet_obj_size)
 861             {
 862                 asf->packet_time_start = 0;
 863                 url_fskip(pb, asf->packet_multi_size);
 864                 asf->packet_size_left -= asf->packet_multi_size;
 865                 continue;
 866             }
 867             asf->packet_multi_size -= asf->packet_obj_size;
 868             //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);
 869         }
 870         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 871               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 872            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 873             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 874                 asf_st->frag_offset, asf->packet_frag_size,
 875                 asf->packet_obj_size, asf_st->pkt.size);
 876             asf->packet_obj_size= asf_st->pkt.size;
 877         }
 878
 879         if (   asf_st->pkt.size != asf->packet_obj_size
 880             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 881             if(asf_st->pkt.data){
 882                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 883                 asf_st->frag_offset = 0;
 884                 av_free_packet(&asf_st->pkt);
 885             }
 886             /* new packet */
 887             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 888             asf_st->seq = asf->packet_seq;
 889             asf_st->pkt.dts = asf->packet_frag_timestamp;
 890             asf_st->pkt.stream_index = asf->stream_index;
 891             asf_st->pkt.pos =
 892             asf_st->packet_pos= asf->packet_pos;
 893 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 894 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
 895 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
 896             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 897                 asf->packet_key_frame = 1;
 898             if (asf->packet_key_frame)
 899                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
 900         }
 901
 902         /* read data */
 903         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 904         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 905         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 906         asf->packet_size_left -= asf->packet_frag_size;
 907         if (asf->packet_size_left < 0)
 908             continue;
 909
 910         if(   asf->packet_frag_offset >= asf_st->pkt.size
 911            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 912             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 913                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 914             continue;
 915         }
 916
 917         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 918                          asf->packet_frag_size);
 919         if (ret != asf->packet_frag_size) {
 920             if (ret < 0 || asf->packet_frag_offset + ret == 0)
 921                 return ret < 0 ? ret : AVERROR_EOF;
 922             if (asf_st->ds_span > 1) {
 923                 // scrambling, we can either drop it completely or fill the remainder
 924                 // TODO: should we fill the whole packet instead of just the current
 925                 // fragment?
 926                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
 927                        asf->packet_frag_size - ret);
 928                 ret = asf->packet_frag_size;
 929             } else
 930                 // no scrambling, so we can return partial packets
 931                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
 932         }
 933         if (s->key && s->keylen == 20)
 934             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 935                             ret);
 936         asf_st->frag_offset += ret;
 937         /* test if whole packet is read */
 938         if (asf_st->frag_offset == asf_st->pkt.size) {
 939             //workaround for macroshit radio DVR-MS files
 940             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 941                && asf_st->pkt.size > 100){
 942                 int i;
 943                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 944                 if(i == asf_st->pkt.size){
 945                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 946                     asf_st->frag_offset = 0;
 947                     av_free_packet(&asf_st->pkt);
 948                     continue;
 949                 }
 950             }
 951
 952             /* return packet */
 953             if (asf_st->ds_span > 1) {
 954               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 955                     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);
 956               }else{
 957                 /* packet descrambling */
 958                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
 959                 if (newdata) {
 960                     int offset = 0;
 961                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 962                     while (offset < asf_st->pkt.size) {
 963                         int off = offset / asf_st->ds_chunk_size;
 964                         int row = off / asf_st->ds_span;
 965                         int col = off % asf_st->ds_span;
 966                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 967                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 968
 969                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 970                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 971                         memcpy(newdata + offset,
 972                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 973                                asf_st->ds_chunk_size);
 974                         offset += asf_st->ds_chunk_size;
 975                     }
 976                     av_free(asf_st->pkt.data);
 977                     asf_st->pkt.data = newdata;
 978                 }
 979               }
 980             }
 981             asf_st->frag_offset = 0;
 982             *pkt= asf_st->pkt;
 983             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 984             asf_st->pkt.size = 0;
 985             asf_st->pkt.data = 0;
 986             break; // packet completed
 987         }
 988     }
 989     return 0;
 990 }
 991
 992 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 993 {
 994     ASFContext *asf = s->priv_data;
 995
 996     for (;;) {
 997         int ret;
 998
 999         /* parse cached packets, if any */
1000         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1001             return ret;
1002         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1003             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1004         asf->packet_time_start = 0;
1005     }
1006
1007     return 0;
1008 }
1009
1010 // Added to support seeking after packets have been read
1011 // If information is not reset, read_packet fails due to
1012 // leftover information from previous reads
1013 static void asf_reset_header(AVFormatContext *s)
1014 {
1015     ASFContext *asf = s->priv_data;
1016     ASFStream *asf_st;
1017     int i;
1018
1019     asf->packet_size_left = 0;
1020     asf->packet_segments = 0;
1021     asf->packet_flags = 0;
1022     asf->packet_property = 0;
1023     asf->packet_timestamp = 0;
1024     asf->packet_segsizetype = 0;
1025     asf->packet_segments = 0;
1026     asf->packet_seq = 0;
1027     asf->packet_replic_size = 0;
1028     asf->packet_key_frame = 0;
1029     asf->packet_padsize = 0;
1030     asf->packet_frag_offset = 0;
1031     asf->packet_frag_size = 0;
1032     asf->packet_frag_timestamp = 0;
1033     asf->packet_multi_size = 0;
1034     asf->packet_obj_size = 0;
1035     asf->packet_time_delta = 0;
1036     asf->packet_time_start = 0;
1037
1038     for(i=0; i<s->nb_streams; i++){
1039         asf_st= s->streams[i]->priv_data;
1040         av_free_packet(&asf_st->pkt);
1041         asf_st->frag_offset=0;
1042         asf_st->seq=0;
1043     }
1044     asf->asf_st= NULL;
1045 }
1046
1047 static int asf_read_close(AVFormatContext *s)
1048 {
1049     int i;
1050
1051     asf_reset_header(s);
1052     for(i=0;i<s->nb_streams;i++) {
1053         AVStream *st = s->streams[i];
1054         av_free(st->codec->palctrl);
1055     }
1056     return 0;
1057 }
1058
1059 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1060 {
1061     AVPacket pkt1, *pkt = &pkt1;
1062     ASFStream *asf_st;
1063     int64_t pts;
1064     int64_t pos= *ppos;
1065     int i;
1066     int64_t start_pos[ASF_MAX_STREAMS];
1067
1068     for(i=0; i<s->nb_streams; i++){
1069         start_pos[i]= pos;
1070     }
1071
1072     if (s->packet_size > 0)
1073         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1074     *ppos= pos;
1075     url_fseek(s->pb, pos, SEEK_SET);
1076
1077 //printf("asf_read_pts\n");
1078     asf_reset_header(s);
1079     for(;;){
1080         if (av_read_frame(s, pkt) < 0){
1081             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1082             return AV_NOPTS_VALUE;
1083         }
1084
1085         pts= pkt->pts;
1086
1087         av_free_packet(pkt);
1088         if(pkt->flags&AV_PKT_FLAG_KEY){
1089             i= pkt->stream_index;
1090
1091             asf_st= s->streams[i]->priv_data;
1092
1093 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1094             pos= asf_st->packet_pos;
1095
1096             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1097             start_pos[i]= asf_st->packet_pos + 1;
1098
1099             if(pkt->stream_index == stream_index)
1100                break;
1101         }
1102     }
1103
1104     *ppos= pos;
1105 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1106
1107     return pts;
1108 }
1109
1110 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1111 {
1112     ff_asf_guid g;
1113     ASFContext *asf = s->priv_data;
1114     int64_t current_pos= url_ftell(s->pb);
1115     int i;
1116
1117     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1118     ff_get_guid(s->pb, &g);
1119
1120     /* the data object can be followed by other top-level objects,
1121        skip them until the simple index object is reached */
1122     while (ff_guidcmp(&g, &index_guid)) {
1123         int64_t gsize= get_le64(s->pb);
1124         if (gsize < 24 || url_feof(s->pb)) {
1125             url_fseek(s->pb, current_pos, SEEK_SET);
1126             return;
1127         }
1128         url_fseek(s->pb, gsize-24, SEEK_CUR);
1129         ff_get_guid(s->pb, &g);
1130     }
1131
1132     {
1133         int64_t itime, last_pos=-1;
1134         int pct, ict;
1135         int64_t av_unused gsize= get_le64(s->pb);
1136         ff_get_guid(s->pb, &g);
1137         itime=get_le64(s->pb);
1138         pct=get_le32(s->pb);
1139         ict=get_le32(s->pb);
1140         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1141
1142         for (i=0;i<ict;i++){
1143             int pktnum=get_le32(s->pb);
1144             int pktct =get_le16(s->pb);
1145             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1146             int64_t index_pts= av_rescale(itime, i, 10000);
1147
1148             if(pos != last_pos){
1149             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1150             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1151             last_pos=pos;
1152             }
1153         }
1154         asf->index_read= 1;
1155     }
1156     url_fseek(s->pb, current_pos, SEEK_SET);
1157 }
1158
1159 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1160 {
1161     ASFContext *asf = s->priv_data;
1162     AVStream *st = s->streams[stream_index];
1163     int64_t pos;
1164     int index;
1165
1166     if (s->packet_size <= 0)
1167         return -1;
1168
1169     /* Try using the protocol's read_seek if available */
1170     if(s->pb) {
1171         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1172         if(ret >= 0)
1173             asf_reset_header(s);
1174         if (ret != AVERROR(ENOSYS))
1175             return ret;
1176     }
1177
1178     if (!asf->index_read)
1179         asf_build_simple_index(s, stream_index);
1180
1181     if(!(asf->index_read && st->index_entries)){
1182         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1183             return -1;
1184     }else{
1185         index= av_index_search_timestamp(st, pts, flags);
1186         if(index<0)
1187             return -1;
1188
1189         /* find the position */
1190         pos = st->index_entries[index].pos;
1191
1192     // various attempts to find key frame have failed so far
1193     //    asf_reset_header(s);
1194     //    url_fseek(s->pb, pos, SEEK_SET);
1195     //    key_pos = pos;
1196     //     for(i=0;i<16;i++){
1197     //         pos = url_ftell(s->pb);
1198     //         if (av_read_frame(s, &pkt) < 0){
1199     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1200     //             return -1;
1201     //         }
1202     //         asf_st = s->streams[stream_index]->priv_data;
1203     //         pos += st->parser->frame_offset;
1204     //
1205     //         if (pkt.size > b) {
1206     //             b = pkt.size;
1207     //             key_pos = pos;
1208     //         }
1209     //
1210     //         av_free_packet(&pkt);
1211     //     }
1212
1213         /* do the seek */
1214         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1215         url_fseek(s->pb, pos, SEEK_SET);
1216     }
1217     asf_reset_header(s);
1218     return 0;
1219 }
1220
1221 AVInputFormat ff_asf_demuxer = {
1222     "asf",
1223     NULL_IF_CONFIG_SMALL("ASF format"),
1224     sizeof(ASFContext),
1225     asf_probe,
1226     asf_read_header,
1227     asf_read_packet,
1228     asf_read_close,
1229     asf_read_seek,
1230     asf_read_pts,
1231 };