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 int ff_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 (!ff_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 void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
 101 {
 102     assert(sizeof(*g) == 16);
 103     get_buffer(s, *g, sizeof(*g));
 104 }
 105
 106 static int asf_probe(AVProbeData *pd)
 107 {
 108     /* check file header */
 109     if (!ff_guidcmp(pd->buf, &ff_asf_header))
 110         return AVPROBE_SCORE_MAX;
 111     else
 112         return 0;
 113 }
 114
 115 static int get_value(ByteIOContext *pb, int type){
 116     switch(type){
 117         case 2: return get_le32(pb);
 118         case 3: return get_le32(pb);
 119         case 4: return get_le64(pb);
 120         case 5: return get_le16(pb);
 121         default:return INT_MIN;
 122     }
 123 }
 124
 125 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 126 {
 127     char *value;
 128
 129     if ((unsigned)len >= (UINT_MAX - 1)/2)
 130         return;
 131
 132     value = av_malloc(2*len+1);
 133     if (!value)
 134         return;
 135
 136     if (type == 0) {         // UTF16-LE
 137         avio_get_str16le(s->pb, len, value, 2*len + 1);
 138     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
 139         uint64_t num = get_value(s->pb, type);
 140         snprintf(value, len, "%"PRIu64, num);
 141     } else {
 142         url_fskip(s->pb, len);
 143         av_freep(&value);
 144         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
 145         return;
 146     }
 147     av_metadata_set2(&s->metadata, key, value, 0);
 148     av_freep(&value);
 149 }
 150
 151 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 152 {
 153     ASFContext *asf = s->priv_data;
 154     ff_asf_guid g;
 155     ByteIOContext *pb = s->pb;
 156     AVStream *st;
 157     ASFStream *asf_st;
 158     int size, i;
 159     int64_t gsize;
 160     AVRational dar[128];
 161     uint32_t bitrate[128];
 162
 163     memset(dar, 0, sizeof(dar));
 164     memset(bitrate, 0, sizeof(bitrate));
 165
 166     ff_get_guid(pb, &g);
 167     if (ff_guidcmp(&g, &ff_asf_header))
 168         return -1;
 169     get_le64(pb);
 170     get_le32(pb);
 171     get_byte(pb);
 172     get_byte(pb);
 173     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 174     for(;;) {
 175         uint64_t gpos= url_ftell(pb);
 176         int ret;
 177         ff_get_guid(pb, &g);
 178         gsize = get_le64(pb);
 179         dprintf(s, "%08"PRIx64": ", gpos);
 180         print_guid(&g);
 181         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 182         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
 183             asf->data_object_offset = url_ftell(pb);
 184             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 185             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 186                 asf->data_object_size = gsize - 24;
 187             } else {
 188                 asf->data_object_size = (uint64_t)-1;
 189             }
 190             break;
 191         }
 192         if (gsize < 24)
 193             return -1;
 194         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
 195             ff_get_guid(pb, &asf->hdr.guid);
 196             asf->hdr.file_size          = get_le64(pb);
 197             asf->hdr.create_time        = get_le64(pb);
 198             asf->nb_packets             = get_le64(pb);
 199             asf->hdr.play_time          = get_le64(pb);
 200             asf->hdr.send_time          = get_le64(pb);
 201             asf->hdr.preroll            = get_le32(pb);
 202             asf->hdr.ignore             = get_le32(pb);
 203             asf->hdr.flags              = get_le32(pb);
 204             asf->hdr.min_pktsize        = get_le32(pb);
 205             asf->hdr.max_pktsize        = get_le32(pb);
 206             asf->hdr.max_bitrate        = get_le32(pb);
 207             s->packet_size = asf->hdr.max_pktsize;
 208         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
 209             enum AVMediaType type;
 210             int type_specific_size, sizeX;
 211             uint64_t total_size;
 212             unsigned int tag1;
 213             int64_t pos1, pos2, start_time;
 214             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 215
 216             if (s->nb_streams == ASF_MAX_STREAMS) {
 217                 av_log(s, AV_LOG_ERROR, "too many streams\n");
 218                 return AVERROR(EINVAL);
 219             }
 220
 221             pos1 = url_ftell(pb);
 222
 223             st = av_new_stream(s, 0);
 224             if (!st)
 225                 return AVERROR(ENOMEM);
 226             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 227             asf_st = av_mallocz(sizeof(ASFStream));
 228             if (!asf_st)
 229                 return AVERROR(ENOMEM);
 230             st->priv_data = asf_st;
 231             start_time = asf->hdr.preroll;
 232
 233             asf_st->stream_language_index = 128; // invalid stream index means no language info
 234
 235             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 236                 st->duration = asf->hdr.play_time /
 237                     (10000000 / 1000) - start_time;
 238             }
 239             ff_get_guid(pb, &g);
 240
 241             test_for_ext_stream_audio = 0;
 242             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
 243                 type = AVMEDIA_TYPE_AUDIO;
 244             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
 245                 type = AVMEDIA_TYPE_VIDEO;
 246             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
 247                 type = AVMEDIA_TYPE_VIDEO;
 248                 st->codec->codec_id = CODEC_ID_MJPEG;
 249             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
 250                 type = AVMEDIA_TYPE_DATA;
 251             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 252                 test_for_ext_stream_audio = 1;
 253                 type = AVMEDIA_TYPE_UNKNOWN;
 254             } else {
 255                 return -1;
 256             }
 257             ff_get_guid(pb, &g);
 258             total_size = get_le64(pb);
 259             type_specific_size = get_le32(pb);
 260             get_le32(pb);
 261             st->id = get_le16(pb) & 0x7f; /* stream id */
 262             // mapping of asf ID to AV stream ID;
 263             asf->asfid2avid[st->id] = s->nb_streams - 1;
 264
 265             get_le32(pb);
 266
 267             if (test_for_ext_stream_audio) {
 268                 ff_get_guid(pb, &g);
 269                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 270                     type = AVMEDIA_TYPE_AUDIO;
 271                     is_dvr_ms_audio=1;
 272                     ff_get_guid(pb, &g);
 273                     get_le32(pb);
 274                     get_le32(pb);
 275                     get_le32(pb);
 276                     ff_get_guid(pb, &g);
 277                     get_le32(pb);
 278                 }
 279             }
 280
 281             st->codec->codec_type = type;
 282             if (type == AVMEDIA_TYPE_AUDIO) {
 283                 ff_get_wav_header(pb, st->codec, type_specific_size);
 284                 if (is_dvr_ms_audio) {
 285                     // codec_id and codec_tag are unreliable in dvr_ms
 286                     // files. Set them later by probing stream.
 287                     st->codec->codec_id = CODEC_ID_PROBE;
 288                     st->codec->codec_tag = 0;
 289                 }
 290                 if (st->codec->codec_id == CODEC_ID_AAC) {
 291                     st->need_parsing = AVSTREAM_PARSE_NONE;
 292                 } else {
 293                     st->need_parsing = AVSTREAM_PARSE_FULL;
 294                 }
 295                 /* We have to init the frame size at some point .... */
 296                 pos2 = url_ftell(pb);
 297                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 298                     asf_st->ds_span = get_byte(pb);
 299                     asf_st->ds_packet_size = get_le16(pb);
 300                     asf_st->ds_chunk_size = get_le16(pb);
 301                     get_le16(pb); //ds_data_size
 302                     get_byte(pb); //ds_silence_data
 303                 }
 304                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 305                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 306                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 307                 if (asf_st->ds_span > 1) {
 308                     if (!asf_st->ds_chunk_size
 309                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 310                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 311                         asf_st->ds_span = 0; // disable descrambling
 312                 }
 313                 switch (st->codec->codec_id) {
 314                 case CODEC_ID_MP3:
 315                     st->codec->frame_size = MPA_FRAME_SIZE;
 316                     break;
 317                 case CODEC_ID_PCM_S16LE:
 318                 case CODEC_ID_PCM_S16BE:
 319                 case CODEC_ID_PCM_U16LE:
 320                 case CODEC_ID_PCM_U16BE:
 321                 case CODEC_ID_PCM_S8:
 322                 case CODEC_ID_PCM_U8:
 323                 case CODEC_ID_PCM_ALAW:
 324                 case CODEC_ID_PCM_MULAW:
 325                     st->codec->frame_size = 1;
 326                     break;
 327                 default:
 328                     /* This is probably wrong, but it prevents a crash later */
 329                     st->codec->frame_size = 1;
 330                     break;
 331                 }
 332             } else if (type == AVMEDIA_TYPE_VIDEO &&
 333                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
 334                 get_le32(pb);
 335                 get_le32(pb);
 336                 get_byte(pb);
 337                 size = get_le16(pb); /* size */
 338                 sizeX= get_le32(pb); /* size */
 339                 st->codec->width = get_le32(pb);
 340                 st->codec->height = get_le32(pb);
 341                 /* not available for asf */
 342                 get_le16(pb); /* panes */
 343                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 344                 tag1 = get_le32(pb);
 345                 url_fskip(pb, 20);
 346 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 347                 size= sizeX;
 348                 if (size > 40) {
 349                     st->codec->extradata_size = size - 40;
 350                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 351                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 352                 }
 353
 354                 /* Extract palette from extradata if bpp <= 8 */
 355                 /* This code assumes that extradata contains only palette */
 356                 /* This is true for all paletted codecs implemented in ffmpeg */
 357                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 358                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 359 #if HAVE_BIGENDIAN
 360                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 361                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
 362 #else
 363                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 364                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 365 #endif
 366                     st->codec->palctrl->palette_changed = 1;
 367                 }
 368
 369                 st->codec->codec_tag = tag1;
 370                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
 371                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
 372                     st->need_parsing = AVSTREAM_PARSE_FULL;
 373                     // 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
 374                     st->codec->width  =
 375                     st->codec->height = 0;
 376                     av_freep(&st->codec->extradata);
 377                     st->codec->extradata_size=0;
 378                 }
 379                 if(st->codec->codec_id == CODEC_ID_H264)
 380                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
 381             }
 382             pos2 = url_ftell(pb);
 383             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 384         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
 385             int len1, len2, len3, len4, len5;
 386
 387             len1 = get_le16(pb);
 388             len2 = get_le16(pb);
 389             len3 = get_le16(pb);
 390             len4 = get_le16(pb);
 391             len5 = get_le16(pb);
 392             get_tag(s, "title"    , 0, len1);
 393             get_tag(s, "author"   , 0, len2);
 394             get_tag(s, "copyright", 0, len3);
 395             get_tag(s, "comment"  , 0, len4);
 396             url_fskip(pb, len5);
 397         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
 398             int stream_count = get_le16(pb);
 399             int j;
 400
 401 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 402 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 403             for(j = 0; j < stream_count; j++) {
 404                 int flags, bitrate, stream_id;
 405
 406                 flags= get_le16(pb);
 407                 bitrate= get_le32(pb);
 408                 stream_id= (flags & 0x7f);
 409 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 410                 asf->stream_bitrates[stream_id]= bitrate;
 411             }
 412         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
 413             int j;
 414             int stream_count = get_le16(pb);
 415             for(j = 0; j < stream_count; j++) {
 416                 char lang[6];
 417                 unsigned int lang_len = get_byte(pb);
 418                 if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
 419                     url_fskip(pb, lang_len - ret);
 420                 if (j < 128)
 421                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 422             }
 423         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
 424             int desc_count, i;
 425
 426             desc_count = get_le16(pb);
 427             for(i=0;i<desc_count;i++) {
 428                     int name_len,value_type,value_len;
 429                     char name[1024];
 430
 431                     name_len = get_le16(pb);
 432                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 433                         name_len += 1;
 434                     if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
 435                         url_fskip(pb, name_len - ret);
 436                     value_type = get_le16(pb);
 437                     value_len  = get_le16(pb);
 438                     if (!value_type && value_len%2)
 439                         value_len += 1;
 440                     /**
 441                      * My sample has that stream set to 0 maybe that mean the container.
 442                      * Asf stream count start at 1. I am using 0 to the container value since it's unused
 443                      */
 444                     if (!strcmp(name, "AspectRatioX")){
 445                         dar[0].num= get_value(s->pb, value_type);
 446                     } else if(!strcmp(name, "AspectRatioY")){
 447                         dar[0].den= get_value(s->pb, value_type);
 448                     } else
 449                         get_tag(s, name, value_type, value_len);
 450             }
 451         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
 452             int n, stream_num, name_len, value_len, value_type, value_num;
 453             n = get_le16(pb);
 454
 455             for(i=0;i<n;i++) {
 456                 char name[1024];
 457
 458                 get_le16(pb); //lang_list_index
 459                 stream_num= get_le16(pb);
 460                 name_len=   get_le16(pb);
 461                 value_type= get_le16(pb);
 462                 value_len=  get_le32(pb);
 463
 464                 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
 465                     url_fskip(pb, name_len - ret);
 466 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 467                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 468                 url_fskip(pb, value_len - 2);
 469
 470                 if(stream_num<128){
 471                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 472                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 473                 }
 474             }
 475         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
 476             int ext_len, payload_ext_ct, stream_ct;
 477             uint32_t ext_d, leak_rate, stream_num;
 478             unsigned int stream_languageid_index;
 479
 480             get_le64(pb); // starttime
 481             get_le64(pb); // endtime
 482             leak_rate = get_le32(pb); // leak-datarate
 483             get_le32(pb); // bucket-datasize
 484             get_le32(pb); // init-bucket-fullness
 485             get_le32(pb); // alt-leak-datarate
 486             get_le32(pb); // alt-bucket-datasize
 487             get_le32(pb); // alt-init-bucket-fullness
 488             get_le32(pb); // max-object-size
 489             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 490             stream_num = get_le16(pb); // stream-num
 491
 492             stream_languageid_index = get_le16(pb); // stream-language-id-index
 493             if (stream_num < 128)
 494                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 495
 496             get_le64(pb); // avg frametime in 100ns units
 497             stream_ct = get_le16(pb); //stream-name-count
 498             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 499
 500             if (stream_num < 128)
 501                 bitrate[stream_num] = leak_rate;
 502
 503             for (i=0; i<stream_ct; i++){
 504                 get_le16(pb);
 505                 ext_len = get_le16(pb);
 506                 url_fseek(pb, ext_len, SEEK_CUR);
 507             }
 508
 509             for (i=0; i<payload_ext_ct; i++){
 510                 ff_get_guid(pb, &g);
 511                 ext_d=get_le16(pb);
 512                 ext_len=get_le32(pb);
 513                 url_fseek(pb, ext_len, SEEK_CUR);
 514             }
 515
 516             // there could be a optional stream properties object to follow
 517             // if so the next iteration will pick it up
 518             continue;
 519         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
 520             int v1, v2;
 521             ff_get_guid(pb, &g);
 522             v1 = get_le32(pb);
 523             v2 = get_le16(pb);
 524             continue;
 525         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
 526             int i, count, name_len;
 527             char name[1024];
 528
 529             get_le64(pb);            // reserved 16 bytes
 530             get_le64(pb);            // ...
 531             count = get_le32(pb);    // markers count
 532             get_le16(pb);            // reserved 2 bytes
 533             name_len = get_le16(pb); // name length
 534             for(i=0;i<name_len;i++){
 535                 get_byte(pb); // skip the name
 536             }
 537
 538             for(i=0;i<count;i++){
 539                 int64_t pres_time;
 540                 int name_len;
 541
 542                 get_le64(pb);             // offset, 8 bytes
 543                 pres_time = get_le64(pb); // presentation time
 544                 get_le16(pb);             // entry length
 545                 get_le32(pb);             // send time
 546                 get_le32(pb);             // flags
 547                 name_len = get_le32(pb);  // name length
 548                 if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
 549                     url_fskip(pb, name_len - ret);
 550                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
 551             }
 552         } else if (url_feof(pb)) {
 553             return -1;
 554         } else {
 555             if (!s->keylen) {
 556                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
 557                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 558                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
 559                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 560                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
 561                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 562                 }
 563             }
 564         }
 565         if(url_ftell(pb) != gpos + gsize)
 566             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
 567         url_fseek(pb, gpos + gsize, SEEK_SET);
 568     }
 569     ff_get_guid(pb, &g);
 570     get_le64(pb);
 571     get_byte(pb);
 572     get_byte(pb);
 573     if (url_feof(pb))
 574         return -1;
 575     asf->data_offset = url_ftell(pb);
 576     asf->packet_size_left = 0;
 577
 578
 579     for(i=0; i<128; i++){
 580         int stream_num= asf->asfid2avid[i];
 581         if(stream_num>=0){
 582             AVStream *st = s->streams[stream_num];
 583             if (!st->codec->bit_rate)
 584                 st->codec->bit_rate = bitrate[i];
 585             if (dar[i].num > 0 && dar[i].den > 0){
 586                 av_reduce(&st->sample_aspect_ratio.num,
 587                           &st->sample_aspect_ratio.den,
 588                           dar[i].num, dar[i].den, INT_MAX);
 589             } else if ((dar[0].num > 0) && (dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
 590                 av_reduce(&st->sample_aspect_ratio.num,
 591                           &st->sample_aspect_ratio.den,
 592                           dar[0].num, dar[0].den, INT_MAX);
 593
 594 //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);
 595
 596             // copy and convert language codes to the frontend
 597             if (asf->streams[i].stream_language_index < 128) {
 598                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 599                 if (rfc1766 && strlen(rfc1766) > 1) {
 600                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 601                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 602                     if (iso6392)
 603                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
 604                 }
 605             }
 606         }
 607     }
 608
 609     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 610
 611     return 0;
 612 }
 613
 614 #define DO_2BITS(bits, var, defval) \
 615     switch (bits & 3) \
 616     { \
 617     case 3: var = get_le32(pb); rsize += 4; break; \
 618     case 2: var = get_le16(pb); rsize += 2; break; \
 619     case 1: var = get_byte(pb); rsize++; break; \
 620     default: var = defval; break; \
 621     }
 622
 623 /**
 624  * Load a single ASF packet into the demuxer.
 625  * @param s demux context
 626  * @param pb context to read data from
 627  * @return 0 on success, <0 on error
 628  */
 629 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 630 {
 631     ASFContext *asf = s->priv_data;
 632     uint32_t packet_length, padsize;
 633     int rsize = 8;
 634     int c, d, e, off;
 635
 636     // if we do not know packet size, allow skipping up to 32 kB
 637     off= 32768;
 638     if (s->packet_size > 0)
 639         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 640
 641     c=d=e=-1;
 642     while(off-- > 0){
 643         c=d; d=e;
 644         e= get_byte(pb);
 645         if(c == 0x82 && !d && !e)
 646             break;
 647     }
 648
 649     if (c != 0x82) {
 650         /**
 651          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 652          * if the packet sync code above triggers -EAGAIN). This does not
 653          * imply complete -EAGAIN handling support at random positions in
 654          * the stream.
 655          */
 656         if (url_ferror(pb) == AVERROR(EAGAIN))
 657             return AVERROR(EAGAIN);
 658         if (!url_feof(pb))
 659             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 660     }
 661     if ((c & 0x8f) == 0x82) {
 662         if (d || e) {
 663             if (!url_feof(pb))
 664                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 665             return -1;
 666         }
 667         c= get_byte(pb);
 668         d= get_byte(pb);
 669         rsize+=3;
 670     }else{
 671         url_fseek(pb, -1, SEEK_CUR); //FIXME
 672     }
 673
 674     asf->packet_flags    = c;
 675     asf->packet_property = d;
 676
 677     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 678     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 679     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 680
 681     //the following checks prevent overflows and infinite loops
 682     if(!packet_length || packet_length >= (1U<<29)){
 683         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 684         return -1;
 685     }
 686     if(padsize >= packet_length){
 687         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 688         return -1;
 689     }
 690
 691     asf->packet_timestamp = get_le32(pb);
 692     get_le16(pb); /* duration */
 693     // rsize has at least 11 bytes which have to be present
 694
 695     if (asf->packet_flags & 0x01) {
 696         asf->packet_segsizetype = get_byte(pb); rsize++;
 697         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 698     } else {
 699         asf->packet_segments = 1;
 700         asf->packet_segsizetype = 0x80;
 701     }
 702     asf->packet_size_left = packet_length - padsize - rsize;
 703     if (packet_length < asf->hdr.min_pktsize)
 704         padsize += asf->hdr.min_pktsize - packet_length;
 705     asf->packet_padsize = padsize;
 706     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 707     return 0;
 708 }
 709
 710 /**
 711  *
 712  * @return <0 if error
 713  */
 714 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 715     ASFContext *asf = s->priv_data;
 716     int rsize = 1;
 717     int num = get_byte(pb);
 718     int64_t ts0, ts1;
 719
 720     asf->packet_segments--;
 721     asf->packet_key_frame = num >> 7;
 722     asf->stream_index = asf->asfid2avid[num & 0x7f];
 723     // sequence should be ignored!
 724     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 725     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 726     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 727 //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);
 728     if (asf->packet_replic_size >= 8) {
 729         asf->packet_obj_size = get_le32(pb);
 730         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 731             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 732             return -1;
 733         }
 734         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 735         if(asf->packet_replic_size >= 8+38+4){
 736 //            for(i=0; i<asf->packet_replic_size-8; i++)
 737 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 738 //            av_log(s, AV_LOG_DEBUG, "\n");
 739             url_fskip(pb, 10);
 740             ts0= get_le64(pb);
 741             ts1= get_le64(pb);
 742             url_fskip(pb, 12);
 743             get_le32(pb);
 744             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 745             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 746             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 747         }else
 748             url_fskip(pb, asf->packet_replic_size - 8);
 749         rsize += asf->packet_replic_size; // FIXME - check validity
 750     } else if (asf->packet_replic_size==1){
 751         // multipacket - frag_offset is beginning timestamp
 752         asf->packet_time_start = asf->packet_frag_offset;
 753         asf->packet_frag_offset = 0;
 754         asf->packet_frag_timestamp = asf->packet_timestamp;
 755
 756         asf->packet_time_delta = get_byte(pb);
 757         rsize++;
 758     }else if(asf->packet_replic_size!=0){
 759         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 760         return -1;
 761     }
 762     if (asf->packet_flags & 0x01) {
 763         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 764         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 765             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 766             return -1;
 767         }
 768         //printf("Fragsize %d\n", asf->packet_frag_size);
 769     } else {
 770         asf->packet_frag_size = asf->packet_size_left - rsize;
 771         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 772     }
 773     if (asf->packet_replic_size == 1) {
 774         asf->packet_multi_size = asf->packet_frag_size;
 775         if (asf->packet_multi_size > asf->packet_size_left)
 776             return -1;
 777     }
 778     asf->packet_size_left -= rsize;
 779     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 780
 781     return 0;
 782 }
 783
 784 /**
 785  * Parse data from individual ASF packets (which were previously loaded
 786  * with asf_get_packet()).
 787  * @param s demux context
 788  * @param pb context to read data from
 789  * @param pkt pointer to store packet data into
 790  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
 791  *          packets need to be loaded (through asf_get_packet())
 792  */
 793 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 794 {
 795     ASFContext *asf = s->priv_data;
 796     ASFStream *asf_st = 0;
 797     for (;;) {
 798         int ret;
 799         if(url_feof(pb))
 800             return AVERROR_EOF;
 801         if (asf->packet_size_left < FRAME_HEADER_SIZE
 802             || asf->packet_segments < 1) {
 803             //asf->packet_size_left <= asf->packet_padsize) {
 804             int ret = asf->packet_size_left + asf->packet_padsize;
 805             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 806             assert(ret>=0);
 807             /* fail safe */
 808             url_fskip(pb, ret);
 809
 810             asf->packet_pos= url_ftell(pb);
 811             if (asf->data_object_size != (uint64_t)-1 &&
 812                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 813                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 814             return 1;
 815         }
 816         if (asf->packet_time_start == 0) {
 817             if(asf_read_frame_header(s, pb) < 0){
 818                 asf->packet_segments= 0;
 819                 continue;
 820             }
 821             if (asf->stream_index < 0
 822                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 823                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 824                 ) {
 825                 asf->packet_time_start = 0;
 826                 /* unhandled packet (should not happen) */
 827                 url_fskip(pb, asf->packet_frag_size);
 828                 asf->packet_size_left -= asf->packet_frag_size;
 829                 if(asf->stream_index < 0)
 830                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 831                 continue;
 832             }
 833             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 834         }
 835         asf_st = asf->asf_st;
 836
 837         if (asf->packet_replic_size == 1) {
 838             // frag_offset is here used as the beginning timestamp
 839             asf->packet_frag_timestamp = asf->packet_time_start;
 840             asf->packet_time_start += asf->packet_time_delta;
 841             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 842             asf->packet_size_left--;
 843             asf->packet_multi_size--;
 844             if (asf->packet_multi_size < asf->packet_obj_size)
 845             {
 846                 asf->packet_time_start = 0;
 847                 url_fskip(pb, asf->packet_multi_size);
 848                 asf->packet_size_left -= asf->packet_multi_size;
 849                 continue;
 850             }
 851             asf->packet_multi_size -= asf->packet_obj_size;
 852             //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);
 853         }
 854         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 855               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 856            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 857             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 858                 asf_st->frag_offset, asf->packet_frag_size,
 859                 asf->packet_obj_size, asf_st->pkt.size);
 860             asf->packet_obj_size= asf_st->pkt.size;
 861         }
 862
 863         if (   asf_st->pkt.size != asf->packet_obj_size
 864             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 865             if(asf_st->pkt.data){
 866                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 867                 asf_st->frag_offset = 0;
 868                 av_free_packet(&asf_st->pkt);
 869             }
 870             /* new packet */
 871             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 872             asf_st->seq = asf->packet_seq;
 873             asf_st->pkt.dts = asf->packet_frag_timestamp;
 874             asf_st->pkt.stream_index = asf->stream_index;
 875             asf_st->pkt.pos =
 876             asf_st->packet_pos= asf->packet_pos;
 877 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 878 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
 879 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
 880             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 881                 asf->packet_key_frame = 1;
 882             if (asf->packet_key_frame)
 883                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
 884         }
 885
 886         /* read data */
 887         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 888         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 889         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 890         asf->packet_size_left -= asf->packet_frag_size;
 891         if (asf->packet_size_left < 0)
 892             continue;
 893
 894         if(   asf->packet_frag_offset >= asf_st->pkt.size
 895            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 896             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 897                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 898             continue;
 899         }
 900
 901         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 902                          asf->packet_frag_size);
 903         if (ret != asf->packet_frag_size) {
 904             if (ret < 0 || asf->packet_frag_offset + ret == 0)
 905                 return ret < 0 ? ret : AVERROR_EOF;
 906             if (asf_st->ds_span > 1) {
 907                 // scrambling, we can either drop it completely or fill the remainder
 908                 // TODO: should we fill the whole packet instead of just the current
 909                 // fragment?
 910                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
 911                        asf->packet_frag_size - ret);
 912                 ret = asf->packet_frag_size;
 913             } else
 914                 // no scrambling, so we can return partial packets
 915                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
 916         }
 917         if (s->key && s->keylen == 20)
 918             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 919                             ret);
 920         asf_st->frag_offset += ret;
 921         /* test if whole packet is read */
 922         if (asf_st->frag_offset == asf_st->pkt.size) {
 923             //workaround for macroshit radio DVR-MS files
 924             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 925                && asf_st->pkt.size > 100){
 926                 int i;
 927                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 928                 if(i == asf_st->pkt.size){
 929                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 930                     asf_st->frag_offset = 0;
 931                     av_free_packet(&asf_st->pkt);
 932                     continue;
 933                 }
 934             }
 935
 936             /* return packet */
 937             if (asf_st->ds_span > 1) {
 938               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 939                     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);
 940               }else{
 941                 /* packet descrambling */
 942                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
 943                 if (newdata) {
 944                     int offset = 0;
 945                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 946                     while (offset < asf_st->pkt.size) {
 947                         int off = offset / asf_st->ds_chunk_size;
 948                         int row = off / asf_st->ds_span;
 949                         int col = off % asf_st->ds_span;
 950                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 951                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 952
 953                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 954                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 955                         memcpy(newdata + offset,
 956                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 957                                asf_st->ds_chunk_size);
 958                         offset += asf_st->ds_chunk_size;
 959                     }
 960                     av_free(asf_st->pkt.data);
 961                     asf_st->pkt.data = newdata;
 962                 }
 963               }
 964             }
 965             asf_st->frag_offset = 0;
 966             *pkt= asf_st->pkt;
 967             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 968             asf_st->pkt.size = 0;
 969             asf_st->pkt.data = 0;
 970             break; // packet completed
 971         }
 972     }
 973     return 0;
 974 }
 975
 976 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 977 {
 978     ASFContext *asf = s->priv_data;
 979
 980     for (;;) {
 981         int ret;
 982
 983         /* parse cached packets, if any */
 984         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 985             return ret;
 986         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 987             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 988         asf->packet_time_start = 0;
 989     }
 990
 991     return 0;
 992 }
 993
 994 // Added to support seeking after packets have been read
 995 // If information is not reset, read_packet fails due to
 996 // leftover information from previous reads
 997 static void asf_reset_header(AVFormatContext *s)
 998 {
 999     ASFContext *asf = s->priv_data;
1000     ASFStream *asf_st;
1001     int i;
1002
1003     asf->packet_nb_frames = 0;
1004     asf->packet_size_left = 0;
1005     asf->packet_segments = 0;
1006     asf->packet_flags = 0;
1007     asf->packet_property = 0;
1008     asf->packet_timestamp = 0;
1009     asf->packet_segsizetype = 0;
1010     asf->packet_segments = 0;
1011     asf->packet_seq = 0;
1012     asf->packet_replic_size = 0;
1013     asf->packet_key_frame = 0;
1014     asf->packet_padsize = 0;
1015     asf->packet_frag_offset = 0;
1016     asf->packet_frag_size = 0;
1017     asf->packet_frag_timestamp = 0;
1018     asf->packet_multi_size = 0;
1019     asf->packet_obj_size = 0;
1020     asf->packet_time_delta = 0;
1021     asf->packet_time_start = 0;
1022
1023     for(i=0; i<s->nb_streams; i++){
1024         asf_st= s->streams[i]->priv_data;
1025         av_free_packet(&asf_st->pkt);
1026         asf_st->frag_offset=0;
1027         asf_st->seq=0;
1028     }
1029     asf->asf_st= NULL;
1030 }
1031
1032 static int asf_read_close(AVFormatContext *s)
1033 {
1034     int i;
1035
1036     asf_reset_header(s);
1037     for(i=0;i<s->nb_streams;i++) {
1038         AVStream *st = s->streams[i];
1039         av_free(st->codec->palctrl);
1040     }
1041     return 0;
1042 }
1043
1044 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1045 {
1046     AVPacket pkt1, *pkt = &pkt1;
1047     ASFStream *asf_st;
1048     int64_t pts;
1049     int64_t pos= *ppos;
1050     int i;
1051     int64_t start_pos[ASF_MAX_STREAMS];
1052
1053     for(i=0; i<s->nb_streams; i++){
1054         start_pos[i]= pos;
1055     }
1056
1057     if (s->packet_size > 0)
1058         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1059     *ppos= pos;
1060     url_fseek(s->pb, pos, SEEK_SET);
1061
1062 //printf("asf_read_pts\n");
1063     asf_reset_header(s);
1064     for(;;){
1065         if (av_read_frame(s, pkt) < 0){
1066             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1067             return AV_NOPTS_VALUE;
1068         }
1069
1070         pts= pkt->pts;
1071
1072         av_free_packet(pkt);
1073         if(pkt->flags&AV_PKT_FLAG_KEY){
1074             i= pkt->stream_index;
1075
1076             asf_st= s->streams[i]->priv_data;
1077
1078 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1079             pos= asf_st->packet_pos;
1080
1081             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1082             start_pos[i]= asf_st->packet_pos + 1;
1083
1084             if(pkt->stream_index == stream_index)
1085                break;
1086         }
1087     }
1088
1089     *ppos= pos;
1090 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1091
1092     return pts;
1093 }
1094
1095 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1096 {
1097     ff_asf_guid g;
1098     ASFContext *asf = s->priv_data;
1099     int64_t current_pos= url_ftell(s->pb);
1100     int i;
1101
1102     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1103     ff_get_guid(s->pb, &g);
1104
1105     /* the data object can be followed by other top-level objects,
1106        skip them until the simple index object is reached */
1107     while (ff_guidcmp(&g, &index_guid)) {
1108         int64_t gsize= get_le64(s->pb);
1109         if (gsize < 24 || url_feof(s->pb)) {
1110             url_fseek(s->pb, current_pos, SEEK_SET);
1111             return;
1112         }
1113         url_fseek(s->pb, gsize-24, SEEK_CUR);
1114         ff_get_guid(s->pb, &g);
1115     }
1116
1117     {
1118         int64_t itime, last_pos=-1;
1119         int pct, ict;
1120         int64_t av_unused gsize= get_le64(s->pb);
1121         ff_get_guid(s->pb, &g);
1122         itime=get_le64(s->pb);
1123         pct=get_le32(s->pb);
1124         ict=get_le32(s->pb);
1125         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1126
1127         for (i=0;i<ict;i++){
1128             int pktnum=get_le32(s->pb);
1129             int pktct =get_le16(s->pb);
1130             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1131             int64_t index_pts= av_rescale(itime, i, 10000);
1132
1133             if(pos != last_pos){
1134             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1135             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1136             last_pos=pos;
1137             }
1138         }
1139         asf->index_read= 1;
1140     }
1141     url_fseek(s->pb, current_pos, SEEK_SET);
1142 }
1143
1144 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1145 {
1146     ASFContext *asf = s->priv_data;
1147     AVStream *st = s->streams[stream_index];
1148     int64_t pos;
1149     int index;
1150
1151     if (s->packet_size <= 0)
1152         return -1;
1153
1154     /* Try using the protocol's read_seek if available */
1155     if(s->pb) {
1156         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1157         if(ret >= 0)
1158             asf_reset_header(s);
1159         if (ret != AVERROR(ENOSYS))
1160             return ret;
1161     }
1162
1163     if (!asf->index_read)
1164         asf_build_simple_index(s, stream_index);
1165
1166     if(!(asf->index_read && st->index_entries)){
1167         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1168             return -1;
1169     }else{
1170         index= av_index_search_timestamp(st, pts, flags);
1171         if(index<0)
1172             return -1;
1173
1174         /* find the position */
1175         pos = st->index_entries[index].pos;
1176
1177     // various attempts to find key frame have failed so far
1178     //    asf_reset_header(s);
1179     //    url_fseek(s->pb, pos, SEEK_SET);
1180     //    key_pos = pos;
1181     //     for(i=0;i<16;i++){
1182     //         pos = url_ftell(s->pb);
1183     //         if (av_read_frame(s, &pkt) < 0){
1184     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1185     //             return -1;
1186     //         }
1187     //         asf_st = s->streams[stream_index]->priv_data;
1188     //         pos += st->parser->frame_offset;
1189     //
1190     //         if (pkt.size > b) {
1191     //             b = pkt.size;
1192     //             key_pos = pos;
1193     //         }
1194     //
1195     //         av_free_packet(&pkt);
1196     //     }
1197
1198         /* do the seek */
1199         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1200         url_fseek(s->pb, pos, SEEK_SET);
1201     }
1202     asf_reset_header(s);
1203     return 0;
1204 }
1205
1206 AVInputFormat ff_asf_demuxer = {
1207     "asf",
1208     NULL_IF_CONFIG_SMALL("ASF format"),
1209     sizeof(ASFContext),
1210     asf_probe,
1211     asf_read_header,
1212     asf_read_packet,
1213     asf_read_close,
1214     asf_read_seek,
1215     asf_read_pts,
1216 };