git.sesse.net Git - ffmpeg/blob - libavformat/asfdec.c

   1 /*
   2  * ASF compatible demuxer
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 //#define DEBUG
  23
  24 #include "libavutil/common.h"
  25 #include "libavutil/avstring.h"
  26 #include "libavcodec/mpegaudio.h"
  27 #include "avformat.h"
  28 #include "riff.h"
  29 #include "asf.h"
  30 #include "asfcrypt.h"
  31 #include "avlanguage.h"
  32
  33 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  34
  35 #undef NDEBUG
  36 #include <assert.h>
  37
  38 #define FRAME_HEADER_SIZE 17
  39 // Fix Me! FRAME_HEADER_SIZE may be different.
  40
  41 static const ff_asf_guid index_guid = {
  42     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  43 };
  44
  45 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
  46     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  47 };
  48 /**********************************/
  49 /* decoding */
  50
  51 static int guidcmp(const void *g1, const void *g2)
  52 {
  53     return memcmp(g1, g2, sizeof(ff_asf_guid));
  54 }
  55
  56 #ifdef DEBUG
  57 #define PRINT_IF_GUID(g,cmp) \
  58 if (!guidcmp(g, &cmp)) \
  59     dprintf(NULL, "(GUID: %s) ", #cmp)
  60
  61 static void print_guid(const ff_asf_guid *g)
  62 {
  63     int i;
  64     PRINT_IF_GUID(g, ff_asf_header);
  65     else PRINT_IF_GUID(g, ff_asf_file_header);
  66     else PRINT_IF_GUID(g, ff_asf_stream_header);
  67     else PRINT_IF_GUID(g, ff_asf_audio_stream);
  68     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
  69     else PRINT_IF_GUID(g, ff_asf_video_stream);
  70     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
  71     else PRINT_IF_GUID(g, ff_asf_command_stream);
  72     else PRINT_IF_GUID(g, ff_asf_comment_header);
  73     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
  74     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
  75     else PRINT_IF_GUID(g, ff_asf_data_header);
  76     else PRINT_IF_GUID(g, index_guid);
  77     else PRINT_IF_GUID(g, ff_asf_head1_guid);
  78     else PRINT_IF_GUID(g, ff_asf_head2_guid);
  79     else PRINT_IF_GUID(g, ff_asf_my_guid);
  80     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
  81     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
  82     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
  83     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
  84     else PRINT_IF_GUID(g, ff_asf_metadata_header);
  85     else PRINT_IF_GUID(g, ff_asf_marker_header);
  86     else PRINT_IF_GUID(g, stream_bitrate_guid);
  87     else PRINT_IF_GUID(g, ff_asf_language_guid);
  88     else
  89         dprintf(NULL, "(GUID: unknown) ");
  90     for(i=0;i<16;i++)
  91         dprintf(NULL, " 0x%02x,", (*g)[i]);
  92     dprintf(NULL, "}\n");
  93 }
  94 #undef PRINT_IF_GUID
  95 #else
  96 #define print_guid(g)
  97 #endif
  98
  99 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
 100 {
 101     assert(sizeof(*g) == 16);
 102     get_buffer(s, *g, sizeof(*g));
 103 }
 104
 105 #if 0
 106 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
 107 {
 108     int len, c;
 109     char *q;
 110
 111     len = get_le16(pb);
 112     q = buf;
 113     while (len > 0) {
 114         c = get_le16(pb);
 115         if ((q - buf) < buf_size - 1)
 116             *q++ = c;
 117         len--;
 118     }
 119     *q = '\0';
 120 }
 121 #endif
 122
 123 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 124 {
 125     char* q = buf;
 126     while (len > 1) {
 127         uint8_t tmp;
 128         uint32_t ch;
 129
 130         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
 131         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 132     }
 133     if (len > 0)
 134         url_fskip(pb, len);
 135     *q = '\0';
 136 }
 137
 138 static int asf_probe(AVProbeData *pd)
 139 {
 140     /* check file header */
 141     if (!guidcmp(pd->buf, &ff_asf_header))
 142         return AVPROBE_SCORE_MAX;
 143     else
 144         return 0;
 145 }
 146
 147 static int get_value(ByteIOContext *pb, int type){
 148     switch(type){
 149         case 2: return get_le32(pb);
 150         case 3: return get_le32(pb);
 151         case 4: return get_le64(pb);
 152         case 5: return get_le16(pb);
 153         default:return INT_MIN;
 154     }
 155 }
 156
 157 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 158 {
 159     char *value;
 160
 161     if ((unsigned)len >= (UINT_MAX - 1)/2)
 162         return;
 163
 164     value = av_malloc(2*len+1);
 165     if (!value)
 166         return;
 167
 168     if (type == 0) {         // UTF16-LE
 169         get_str16_nolen(s->pb, len, value, 2*len + 1);
 170     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
 171         uint64_t num = get_value(s->pb, type);
 172         snprintf(value, len, "%"PRIu64, num);
 173     } else {
 174         url_fskip(s->pb, len);
 175         av_freep(&value);
 176         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
 177         return;
 178     }
 179     av_metadata_set2(&s->metadata, key, value, 0);
 180     av_freep(&value);
 181 }
 182
 183 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 184 {
 185     ASFContext *asf = s->priv_data;
 186     ff_asf_guid g;
 187     ByteIOContext *pb = s->pb;
 188     AVStream *st;
 189     ASFStream *asf_st;
 190     int size, i;
 191     int64_t gsize;
 192     AVRational dar[128];
 193     uint32_t bitrate[128];
 194
 195     memset(dar, 0, sizeof(dar));
 196     memset(bitrate, 0, sizeof(bitrate));
 197
 198     get_guid(pb, &g);
 199     if (guidcmp(&g, &ff_asf_header))
 200         return -1;
 201     get_le64(pb);
 202     get_le32(pb);
 203     get_byte(pb);
 204     get_byte(pb);
 205     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 206     for(;;) {
 207         uint64_t gpos= url_ftell(pb);
 208         get_guid(pb, &g);
 209         gsize = get_le64(pb);
 210         dprintf(s, "%08"PRIx64": ", gpos);
 211         print_guid(&g);
 212         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 213         if (!guidcmp(&g, &ff_asf_data_header)) {
 214             asf->data_object_offset = url_ftell(pb);
 215             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 216             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 217                 asf->data_object_size = gsize - 24;
 218             } else {
 219                 asf->data_object_size = (uint64_t)-1;
 220             }
 221             break;
 222         }
 223         if (gsize < 24)
 224             return -1;
 225         if (!guidcmp(&g, &ff_asf_file_header)) {
 226             get_guid(pb, &asf->hdr.guid);
 227             asf->hdr.file_size          = get_le64(pb);
 228             asf->hdr.create_time        = get_le64(pb);
 229             asf->nb_packets             = get_le64(pb);
 230             asf->hdr.play_time          = get_le64(pb);
 231             asf->hdr.send_time          = get_le64(pb);
 232             asf->hdr.preroll            = get_le32(pb);
 233             asf->hdr.ignore             = get_le32(pb);
 234             asf->hdr.flags              = get_le32(pb);
 235             asf->hdr.min_pktsize        = get_le32(pb);
 236             asf->hdr.max_pktsize        = get_le32(pb);
 237             asf->hdr.max_bitrate        = get_le32(pb);
 238             s->packet_size = asf->hdr.max_pktsize;
 239         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
 240             enum 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             pos1 = url_ftell(pb);
 248
 249             st = av_new_stream(s, 0);
 250             if (!st)
 251                 return AVERROR(ENOMEM);
 252             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 253             asf_st = av_mallocz(sizeof(ASFStream));
 254             if (!asf_st)
 255                 return AVERROR(ENOMEM);
 256             st->priv_data = asf_st;
 257             start_time = asf->hdr.preroll;
 258
 259             asf_st->stream_language_index = 128; // invalid stream index means no language info
 260
 261             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 262                 st->duration = asf->hdr.play_time /
 263                     (10000000 / 1000) - start_time;
 264             }
 265             get_guid(pb, &g);
 266
 267             test_for_ext_stream_audio = 0;
 268             if (!guidcmp(&g, &ff_asf_audio_stream)) {
 269                 type = AVMEDIA_TYPE_AUDIO;
 270             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
 271                 type = AVMEDIA_TYPE_VIDEO;
 272             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
 273                 type = AVMEDIA_TYPE_DATA;
 274             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 275                 test_for_ext_stream_audio = 1;
 276                 type = AVMEDIA_TYPE_UNKNOWN;
 277             } else {
 278                 return -1;
 279             }
 280             get_guid(pb, &g);
 281             total_size = get_le64(pb);
 282             type_specific_size = get_le32(pb);
 283             get_le32(pb);
 284             st->id = get_le16(pb) & 0x7f; /* stream id */
 285             // mapping of asf ID to AV stream ID;
 286             asf->asfid2avid[st->id] = s->nb_streams - 1;
 287
 288             get_le32(pb);
 289
 290             if (test_for_ext_stream_audio) {
 291                 get_guid(pb, &g);
 292                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 293                     type = AVMEDIA_TYPE_AUDIO;
 294                     is_dvr_ms_audio=1;
 295                     get_guid(pb, &g);
 296                     get_le32(pb);
 297                     get_le32(pb);
 298                     get_le32(pb);
 299                     get_guid(pb, &g);
 300                     get_le32(pb);
 301                 }
 302             }
 303
 304             st->codec->codec_type = type;
 305             if (type == AVMEDIA_TYPE_AUDIO) {
 306                 ff_get_wav_header(pb, st->codec, type_specific_size);
 307                 if (is_dvr_ms_audio) {
 308                     // codec_id and codec_tag are unreliable in dvr_ms
 309                     // files. Set them later by probing stream.
 310                     st->codec->codec_id = CODEC_ID_PROBE;
 311                     st->codec->codec_tag = 0;
 312                 }
 313                 if (st->codec->codec_id == CODEC_ID_AAC) {
 314                     st->need_parsing = AVSTREAM_PARSE_NONE;
 315                 } else {
 316                     st->need_parsing = AVSTREAM_PARSE_FULL;
 317                 }
 318                 /* We have to init the frame size at some point .... */
 319                 pos2 = url_ftell(pb);
 320                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 321                     asf_st->ds_span = get_byte(pb);
 322                     asf_st->ds_packet_size = get_le16(pb);
 323                     asf_st->ds_chunk_size = get_le16(pb);
 324                     get_le16(pb); //ds_data_size
 325                     get_byte(pb); //ds_silence_data
 326                 }
 327                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 328                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 329                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 330                 if (asf_st->ds_span > 1) {
 331                     if (!asf_st->ds_chunk_size
 332                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 333                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 334                         asf_st->ds_span = 0; // disable descrambling
 335                 }
 336                 switch (st->codec->codec_id) {
 337                 case CODEC_ID_MP3:
 338                     st->codec->frame_size = MPA_FRAME_SIZE;
 339                     break;
 340                 case CODEC_ID_PCM_S16LE:
 341                 case CODEC_ID_PCM_S16BE:
 342                 case CODEC_ID_PCM_U16LE:
 343                 case CODEC_ID_PCM_U16BE:
 344                 case CODEC_ID_PCM_S8:
 345                 case CODEC_ID_PCM_U8:
 346                 case CODEC_ID_PCM_ALAW:
 347                 case CODEC_ID_PCM_MULAW:
 348                     st->codec->frame_size = 1;
 349                     break;
 350                 default:
 351                     /* This is probably wrong, but it prevents a crash later */
 352                     st->codec->frame_size = 1;
 353                     break;
 354                 }
 355             } else if (type == AVMEDIA_TYPE_VIDEO) {
 356                 get_le32(pb);
 357                 get_le32(pb);
 358                 get_byte(pb);
 359                 size = get_le16(pb); /* size */
 360                 sizeX= get_le32(pb); /* size */
 361                 st->codec->width = get_le32(pb);
 362                 st->codec->height = get_le32(pb);
 363                 /* not available for asf */
 364                 get_le16(pb); /* panes */
 365                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 366                 tag1 = get_le32(pb);
 367                 url_fskip(pb, 20);
 368 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 369                 size= sizeX;
 370                 if (size > 40) {
 371                     st->codec->extradata_size = size - 40;
 372                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 373                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 374                 }
 375
 376                 /* Extract palette from extradata if bpp <= 8 */
 377                 /* This code assumes that extradata contains only palette */
 378                 /* This is true for all paletted codecs implemented in ffmpeg */
 379                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 380                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 381 #if HAVE_BIGENDIAN
 382                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 383                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 384 #else
 385                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 386                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 387 #endif
 388                     st->codec->palctrl->palette_changed = 1;
 389                 }
 390
 391                 st->codec->codec_tag = tag1;
 392                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
 393                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 394                     st->need_parsing = AVSTREAM_PARSE_FULL;
 395                 if(st->codec->codec_id == CODEC_ID_H264)
 396                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
 397             }
 398             pos2 = url_ftell(pb);
 399             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 400         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
 401             int len1, len2, len3, len4, len5;
 402
 403             len1 = get_le16(pb);
 404             len2 = get_le16(pb);
 405             len3 = get_le16(pb);
 406             len4 = get_le16(pb);
 407             len5 = get_le16(pb);
 408             get_tag(s, "title"    , 0, len1);
 409             get_tag(s, "author"   , 0, len2);
 410             get_tag(s, "copyright", 0, len3);
 411             get_tag(s, "comment"  , 0, len4);
 412             url_fskip(pb, len5);
 413         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
 414             int stream_count = get_le16(pb);
 415             int j;
 416
 417 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 418 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 419             for(j = 0; j < stream_count; j++) {
 420                 int flags, bitrate, stream_id;
 421
 422                 flags= get_le16(pb);
 423                 bitrate= get_le32(pb);
 424                 stream_id= (flags & 0x7f);
 425 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 426                 asf->stream_bitrates[stream_id]= bitrate;
 427             }
 428         } else if (!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                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
 435                 if (j < 128)
 436                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 437             }
 438         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
 439             int desc_count, i;
 440
 441             desc_count = get_le16(pb);
 442             for(i=0;i<desc_count;i++) {
 443                     int name_len,value_type,value_len;
 444                     char name[1024];
 445
 446                     name_len = get_le16(pb);
 447                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 448                         name_len += 1;
 449                     get_str16_nolen(pb, name_len, name, sizeof(name));
 450                     value_type = get_le16(pb);
 451                     value_len  = get_le16(pb);
 452                     if (!value_type && value_len%2)
 453                         value_len += 1;
 454                     get_tag(s, name, value_type, value_len);
 455             }
 456         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
 457             int n, stream_num, name_len, value_len, value_type, value_num;
 458             n = get_le16(pb);
 459
 460             for(i=0;i<n;i++) {
 461                 char name[1024];
 462
 463                 get_le16(pb); //lang_list_index
 464                 stream_num= get_le16(pb);
 465                 name_len=   get_le16(pb);
 466                 value_type= get_le16(pb);
 467                 value_len=  get_le32(pb);
 468
 469                 get_str16_nolen(pb, name_len, name, sizeof(name));
 470 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 471                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 472                 url_fskip(pb, value_len - 2);
 473
 474                 if(stream_num<128){
 475                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 476                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 477                 }
 478             }
 479         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
 480             int ext_len, payload_ext_ct, stream_ct;
 481             uint32_t ext_d, leak_rate, stream_num;
 482             unsigned int stream_languageid_index;
 483
 484             get_le64(pb); // starttime
 485             get_le64(pb); // endtime
 486             leak_rate = get_le32(pb); // leak-datarate
 487             get_le32(pb); // bucket-datasize
 488             get_le32(pb); // init-bucket-fullness
 489             get_le32(pb); // alt-leak-datarate
 490             get_le32(pb); // alt-bucket-datasize
 491             get_le32(pb); // alt-init-bucket-fullness
 492             get_le32(pb); // max-object-size
 493             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 494             stream_num = get_le16(pb); // stream-num
 495
 496             stream_languageid_index = get_le16(pb); // stream-language-id-index
 497             if (stream_num < 128)
 498                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 499
 500             get_le64(pb); // avg frametime in 100ns units
 501             stream_ct = get_le16(pb); //stream-name-count
 502             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 503
 504             if (stream_num < 128)
 505                 bitrate[stream_num] = leak_rate;
 506
 507             for (i=0; i<stream_ct; i++){
 508                 get_le16(pb);
 509                 ext_len = get_le16(pb);
 510                 url_fseek(pb, ext_len, SEEK_CUR);
 511             }
 512
 513             for (i=0; i<payload_ext_ct; i++){
 514                 get_guid(pb, &g);
 515                 ext_d=get_le16(pb);
 516                 ext_len=get_le32(pb);
 517                 url_fseek(pb, ext_len, SEEK_CUR);
 518             }
 519
 520             // there could be a optional stream properties object to follow
 521             // if so the next iteration will pick it up
 522         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
 523             int v1, v2;
 524             get_guid(pb, &g);
 525             v1 = get_le32(pb);
 526             v2 = get_le16(pb);
 527         } else if (!guidcmp(&g, &ff_asf_marker_header)) {
 528             int i, count, name_len;
 529             char name[1024];
 530
 531             get_le64(pb);            // reserved 16 bytes
 532             get_le64(pb);            // ...
 533             count = get_le32(pb);    // markers count
 534             get_le16(pb);            // reserved 2 bytes
 535             name_len = get_le16(pb); // name length
 536             for(i=0;i<name_len;i++){
 537                 get_byte(pb); // skip the name
 538             }
 539
 540             for(i=0;i<count;i++){
 541                 int64_t pres_time;
 542                 int name_len;
 543
 544                 get_le64(pb);             // offset, 8 bytes
 545                 pres_time = get_le64(pb); // presentation time
 546                 get_le16(pb);             // entry length
 547                 get_le32(pb);             // send time
 548                 get_le32(pb);             // flags
 549                 name_len = get_le32(pb);  // name length
 550                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
 551                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
 552             }
 553 #if 0
 554         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
 555             int len, v1, n, num;
 556             char str[256], *q;
 557             char tag[16];
 558
 559             get_guid(pb, &g);
 560             print_guid(&g);
 561
 562             n = get_le32(pb);
 563             for(i=0;i<n;i++) {
 564                 num = get_le16(pb); /* stream number */
 565                 get_str16(pb, str, sizeof(str));
 566                 get_str16(pb, str, sizeof(str));
 567                 len = get_le16(pb);
 568                 q = tag;
 569                 while (len > 0) {
 570                     v1 = get_byte(pb);
 571                     if ((q - tag) < sizeof(tag) - 1)
 572                         *q++ = v1;
 573                     len--;
 574                 }
 575                 *q = '\0';
 576             }
 577 #endif
 578         } else if (url_feof(pb)) {
 579             return -1;
 580         } else {
 581             if (!s->keylen) {
 582                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
 583                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 584                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
 585                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 586                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
 587                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 588                 }
 589             }
 590         }
 591         if(url_ftell(pb) != gpos + gsize)
 592             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
 593         url_fseek(pb, gpos + gsize, SEEK_SET);
 594     }
 595     get_guid(pb, &g);
 596     get_le64(pb);
 597     get_byte(pb);
 598     get_byte(pb);
 599     if (url_feof(pb))
 600         return -1;
 601     asf->data_offset = url_ftell(pb);
 602     asf->packet_size_left = 0;
 603
 604
 605     for(i=0; i<128; i++){
 606         int stream_num= asf->asfid2avid[i];
 607         if(stream_num>=0){
 608             AVStream *st = s->streams[stream_num];
 609             if (!st->codec->bit_rate)
 610                 st->codec->bit_rate = bitrate[i];
 611             if (dar[i].num > 0 && dar[i].den > 0)
 612                 av_reduce(&st->sample_aspect_ratio.num,
 613                           &st->sample_aspect_ratio.den,
 614                           dar[i].num, dar[i].den, INT_MAX);
 615 //av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
 616
 617             // copy and convert language codes to the frontend
 618             if (asf->streams[i].stream_language_index < 128) {
 619                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 620                 if (rfc1766 && strlen(rfc1766) > 1) {
 621                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 622                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 623                     if (iso6392)
 624                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
 625                 }
 626             }
 627         }
 628     }
 629
 630     return 0;
 631 }
 632
 633 #define DO_2BITS(bits, var, defval) \
 634     switch (bits & 3) \
 635     { \
 636     case 3: var = get_le32(pb); rsize += 4; break; \
 637     case 2: var = get_le16(pb); rsize += 2; break; \
 638     case 1: var = get_byte(pb); rsize++; break; \
 639     default: var = defval; break; \
 640     }
 641
 642 /**
 643  * Load a single ASF packet into the demuxer.
 644  * @param s demux context
 645  * @param pb context to read data from
 646  * @return 0 on success, <0 on error
 647  */
 648 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 649 {
 650     ASFContext *asf = s->priv_data;
 651     uint32_t packet_length, padsize;
 652     int rsize = 8;
 653     int c, d, e, off;
 654
 655     // if we do not know packet size, allow skipping up to 32 kB
 656     off= 32768;
 657     if (s->packet_size > 0)
 658         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 659
 660     c=d=e=-1;
 661     while(off-- > 0){
 662         c=d; d=e;
 663         e= get_byte(pb);
 664         if(c == 0x82 && !d && !e)
 665             break;
 666     }
 667
 668     if (c != 0x82) {
 669         /**
 670          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 671          * if the packet sync code above triggers -EAGAIN). This does not
 672          * imply complete -EAGAIN handling support at random positions in
 673          * the stream.
 674          */
 675         if (url_ferror(pb) == AVERROR(EAGAIN))
 676             return AVERROR(EAGAIN);
 677         if (!url_feof(pb))
 678             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 679     }
 680     if ((c & 0x8f) == 0x82) {
 681         if (d || e) {
 682             if (!url_feof(pb))
 683                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 684             return -1;
 685         }
 686         c= get_byte(pb);
 687         d= get_byte(pb);
 688         rsize+=3;
 689     }else{
 690         url_fseek(pb, -1, SEEK_CUR); //FIXME
 691     }
 692
 693     asf->packet_flags    = c;
 694     asf->packet_property = d;
 695
 696     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 697     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 698     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 699
 700     //the following checks prevent overflows and infinite loops
 701     if(!packet_length || packet_length >= (1U<<29)){
 702         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 703         return -1;
 704     }
 705     if(padsize >= packet_length){
 706         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 707         return -1;
 708     }
 709
 710     asf->packet_timestamp = get_le32(pb);
 711     get_le16(pb); /* duration */
 712     // rsize has at least 11 bytes which have to be present
 713
 714     if (asf->packet_flags & 0x01) {
 715         asf->packet_segsizetype = get_byte(pb); rsize++;
 716         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 717     } else {
 718         asf->packet_segments = 1;
 719         asf->packet_segsizetype = 0x80;
 720     }
 721     asf->packet_size_left = packet_length - padsize - rsize;
 722     if (packet_length < asf->hdr.min_pktsize)
 723         padsize += asf->hdr.min_pktsize - packet_length;
 724     asf->packet_padsize = padsize;
 725     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 726     return 0;
 727 }
 728
 729 /**
 730  *
 731  * @return <0 if error
 732  */
 733 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 734     ASFContext *asf = s->priv_data;
 735     int rsize = 1;
 736     int num = get_byte(pb);
 737     int64_t ts0, ts1;
 738
 739     asf->packet_segments--;
 740     asf->packet_key_frame = num >> 7;
 741     asf->stream_index = asf->asfid2avid[num & 0x7f];
 742     // sequence should be ignored!
 743     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 744     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 745     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 746 //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);
 747     if (asf->packet_replic_size >= 8) {
 748         asf->packet_obj_size = get_le32(pb);
 749         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 750             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 751             return -1;
 752         }
 753         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 754         if(asf->packet_replic_size >= 8+38+4){
 755 //            for(i=0; i<asf->packet_replic_size-8; i++)
 756 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 757 //            av_log(s, AV_LOG_DEBUG, "\n");
 758             url_fskip(pb, 10);
 759             ts0= get_le64(pb);
 760             ts1= get_le64(pb);
 761             url_fskip(pb, 12);
 762             get_le32(pb);
 763             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 764             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 765             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 766         }else
 767             url_fskip(pb, asf->packet_replic_size - 8);
 768         rsize += asf->packet_replic_size; // FIXME - check validity
 769     } else if (asf->packet_replic_size==1){
 770         // multipacket - frag_offset is beginning timestamp
 771         asf->packet_time_start = asf->packet_frag_offset;
 772         asf->packet_frag_offset = 0;
 773         asf->packet_frag_timestamp = asf->packet_timestamp;
 774
 775         asf->packet_time_delta = get_byte(pb);
 776         rsize++;
 777     }else if(asf->packet_replic_size!=0){
 778         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 779         return -1;
 780     }
 781     if (asf->packet_flags & 0x01) {
 782         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 783         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 784             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 785             return -1;
 786         }
 787         //printf("Fragsize %d\n", asf->packet_frag_size);
 788     } else {
 789         asf->packet_frag_size = asf->packet_size_left - rsize;
 790         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 791     }
 792     if (asf->packet_replic_size == 1) {
 793         asf->packet_multi_size = asf->packet_frag_size;
 794         if (asf->packet_multi_size > asf->packet_size_left)
 795             return -1;
 796     }
 797     asf->packet_size_left -= rsize;
 798     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 799
 800     return 0;
 801 }
 802
 803 /**
 804  * Parse data from individual ASF packets (which were previously loaded
 805  * with asf_get_packet()).
 806  * @param s demux context
 807  * @param pb context to read data from
 808  * @param pkt pointer to store packet data into
 809  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
 810  *          packets need to be loaded (through asf_get_packet())
 811  */
 812 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 813 {
 814     ASFContext *asf = s->priv_data;
 815     ASFStream *asf_st = 0;
 816     for (;;) {
 817         if(url_feof(pb))
 818             return AVERROR_EOF;
 819         if (asf->packet_size_left < FRAME_HEADER_SIZE
 820             || asf->packet_segments < 1) {
 821             //asf->packet_size_left <= asf->packet_padsize) {
 822             int ret = asf->packet_size_left + asf->packet_padsize;
 823             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 824             assert(ret>=0);
 825             /* fail safe */
 826             url_fskip(pb, ret);
 827
 828             asf->packet_pos= url_ftell(pb);
 829             if (asf->data_object_size != (uint64_t)-1 &&
 830                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 831                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 832             return 1;
 833         }
 834         if (asf->packet_time_start == 0) {
 835             if(asf_read_frame_header(s, pb) < 0){
 836                 asf->packet_segments= 0;
 837                 continue;
 838             }
 839             if (asf->stream_index < 0
 840                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 841                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 842                 ) {
 843                 asf->packet_time_start = 0;
 844                 /* unhandled packet (should not happen) */
 845                 url_fskip(pb, asf->packet_frag_size);
 846                 asf->packet_size_left -= asf->packet_frag_size;
 847                 if(asf->stream_index < 0)
 848                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 849                 continue;
 850             }
 851             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 852         }
 853         asf_st = asf->asf_st;
 854
 855         if (asf->packet_replic_size == 1) {
 856             // frag_offset is here used as the beginning timestamp
 857             asf->packet_frag_timestamp = asf->packet_time_start;
 858             asf->packet_time_start += asf->packet_time_delta;
 859             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 860             asf->packet_size_left--;
 861             asf->packet_multi_size--;
 862             if (asf->packet_multi_size < asf->packet_obj_size)
 863             {
 864                 asf->packet_time_start = 0;
 865                 url_fskip(pb, asf->packet_multi_size);
 866                 asf->packet_size_left -= asf->packet_multi_size;
 867                 continue;
 868             }
 869             asf->packet_multi_size -= asf->packet_obj_size;
 870             //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);
 871         }
 872         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 873               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 874            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 875             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 876                 asf_st->frag_offset, asf->packet_frag_size,
 877                 asf->packet_obj_size, asf_st->pkt.size);
 878             asf->packet_obj_size= asf_st->pkt.size;
 879         }
 880
 881         if (   asf_st->pkt.size != asf->packet_obj_size
 882             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 883             if(asf_st->pkt.data){
 884                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 885                 asf_st->frag_offset = 0;
 886                 av_free_packet(&asf_st->pkt);
 887             }
 888             /* new packet */
 889             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 890             asf_st->seq = asf->packet_seq;
 891             asf_st->pkt.dts = asf->packet_frag_timestamp;
 892             asf_st->pkt.stream_index = asf->stream_index;
 893             asf_st->pkt.pos =
 894             asf_st->packet_pos= asf->packet_pos;
 895 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 896 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
 897 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
 898             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 899                 asf->packet_key_frame = 1;
 900             if (asf->packet_key_frame)
 901                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
 902         }
 903
 904         /* read data */
 905         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 906         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 907         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 908         asf->packet_size_left -= asf->packet_frag_size;
 909         if (asf->packet_size_left < 0)
 910             continue;
 911
 912         if(   asf->packet_frag_offset >= asf_st->pkt.size
 913            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 914             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 915                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 916             continue;
 917         }
 918
 919         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 920                    asf->packet_frag_size);
 921         if (s->key && s->keylen == 20)
 922             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 923                             asf->packet_frag_size);
 924         asf_st->frag_offset += asf->packet_frag_size;
 925         /* test if whole packet is read */
 926         if (asf_st->frag_offset == asf_st->pkt.size) {
 927             //workaround for macroshit radio DVR-MS files
 928             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 929                && asf_st->pkt.size > 100){
 930                 int i;
 931                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 932                 if(i == asf_st->pkt.size){
 933                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 934                     asf_st->frag_offset = 0;
 935                     av_free_packet(&asf_st->pkt);
 936                     continue;
 937                 }
 938             }
 939
 940             /* return packet */
 941             if (asf_st->ds_span > 1) {
 942               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 943                     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);
 944               }else{
 945                 /* packet descrambling */
 946                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 947                 if (newdata) {
 948                     int offset = 0;
 949                     while (offset < asf_st->pkt.size) {
 950                         int off = offset / asf_st->ds_chunk_size;
 951                         int row = off / asf_st->ds_span;
 952                         int col = off % asf_st->ds_span;
 953                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 954                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 955
 956                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 957                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 958                         memcpy(newdata + offset,
 959                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 960                                asf_st->ds_chunk_size);
 961                         offset += asf_st->ds_chunk_size;
 962                     }
 963                     av_free(asf_st->pkt.data);
 964                     asf_st->pkt.data = newdata;
 965                 }
 966               }
 967             }
 968             asf_st->frag_offset = 0;
 969             *pkt= asf_st->pkt;
 970             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 971             asf_st->pkt.size = 0;
 972             asf_st->pkt.data = 0;
 973             break; // packet completed
 974         }
 975     }
 976     return 0;
 977 }
 978
 979 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 980 {
 981     ASFContext *asf = s->priv_data;
 982
 983     for (;;) {
 984         int ret;
 985
 986         /* parse cached packets, if any */
 987         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 988             return ret;
 989         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 990             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 991         asf->packet_time_start = 0;
 992     }
 993
 994     return 0;
 995 }
 996
 997 // Added to support seeking after packets have been read
 998 // If information is not reset, read_packet fails due to
 999 // leftover information from previous reads
1000 static void asf_reset_header(AVFormatContext *s)
1001 {
1002     ASFContext *asf = s->priv_data;
1003     ASFStream *asf_st;
1004     int i;
1005
1006     asf->packet_nb_frames = 0;
1007     asf->packet_size_left = 0;
1008     asf->packet_segments = 0;
1009     asf->packet_flags = 0;
1010     asf->packet_property = 0;
1011     asf->packet_timestamp = 0;
1012     asf->packet_segsizetype = 0;
1013     asf->packet_segments = 0;
1014     asf->packet_seq = 0;
1015     asf->packet_replic_size = 0;
1016     asf->packet_key_frame = 0;
1017     asf->packet_padsize = 0;
1018     asf->packet_frag_offset = 0;
1019     asf->packet_frag_size = 0;
1020     asf->packet_frag_timestamp = 0;
1021     asf->packet_multi_size = 0;
1022     asf->packet_obj_size = 0;
1023     asf->packet_time_delta = 0;
1024     asf->packet_time_start = 0;
1025
1026     for(i=0; i<s->nb_streams; i++){
1027         asf_st= s->streams[i]->priv_data;
1028         av_free_packet(&asf_st->pkt);
1029         asf_st->frag_offset=0;
1030         asf_st->seq=0;
1031     }
1032     asf->asf_st= NULL;
1033 }
1034
1035 static int asf_read_close(AVFormatContext *s)
1036 {
1037     int i;
1038
1039     asf_reset_header(s);
1040     for(i=0;i<s->nb_streams;i++) {
1041         AVStream *st = s->streams[i];
1042         av_free(st->codec->palctrl);
1043     }
1044     return 0;
1045 }
1046
1047 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1048 {
1049     AVPacket pkt1, *pkt = &pkt1;
1050     ASFStream *asf_st;
1051     int64_t pts;
1052     int64_t pos= *ppos;
1053     int i;
1054     int64_t start_pos[s->nb_streams];
1055
1056     for(i=0; i<s->nb_streams; i++){
1057         start_pos[i]= pos;
1058     }
1059
1060     if (s->packet_size > 0)
1061         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1062     *ppos= pos;
1063     url_fseek(s->pb, pos, SEEK_SET);
1064
1065 //printf("asf_read_pts\n");
1066     asf_reset_header(s);
1067     for(;;){
1068         if (av_read_frame(s, pkt) < 0){
1069             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1070             return AV_NOPTS_VALUE;
1071         }
1072
1073         pts= pkt->pts;
1074
1075         av_free_packet(pkt);
1076         if(pkt->flags&AV_PKT_FLAG_KEY){
1077             i= pkt->stream_index;
1078
1079             asf_st= s->streams[i]->priv_data;
1080
1081 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1082             pos= asf_st->packet_pos;
1083
1084             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1085             start_pos[i]= asf_st->packet_pos + 1;
1086
1087             if(pkt->stream_index == stream_index)
1088                break;
1089         }
1090     }
1091
1092     *ppos= pos;
1093 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1094
1095     return pts;
1096 }
1097
1098 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1099 {
1100     ff_asf_guid g;
1101     ASFContext *asf = s->priv_data;
1102     int64_t current_pos= url_ftell(s->pb);
1103     int i;
1104
1105     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1106     get_guid(s->pb, &g);
1107     if (!guidcmp(&g, &index_guid)) {
1108         int64_t itime, last_pos=-1;
1109         int pct, ict;
1110         int64_t av_unused gsize= get_le64(s->pb);
1111         get_guid(s->pb, &g);
1112         itime=get_le64(s->pb);
1113         pct=get_le32(s->pb);
1114         ict=get_le32(s->pb);
1115         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1116
1117         for (i=0;i<ict;i++){
1118             int pktnum=get_le32(s->pb);
1119             int pktct =get_le16(s->pb);
1120             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1121             int64_t index_pts= av_rescale(itime, i, 10000);
1122
1123             if(pos != last_pos){
1124             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1125             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1126             last_pos=pos;
1127             }
1128         }
1129         asf->index_read= 1;
1130     }
1131     url_fseek(s->pb, current_pos, SEEK_SET);
1132 }
1133
1134 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1135 {
1136     ASFContext *asf = s->priv_data;
1137     AVStream *st = s->streams[stream_index];
1138     int64_t pos;
1139     int index;
1140
1141     if (s->packet_size <= 0)
1142         return -1;
1143
1144     /* Try using the protocol's read_seek if available */
1145     if(s->pb) {
1146         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1147         if(ret >= 0)
1148             asf_reset_header(s);
1149         if (ret != AVERROR(ENOSYS))
1150             return ret;
1151     }
1152
1153     if (!asf->index_read)
1154         asf_build_simple_index(s, stream_index);
1155
1156     if(!(asf->index_read && st->index_entries)){
1157         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1158             return -1;
1159     }else{
1160         index= av_index_search_timestamp(st, pts, flags);
1161         if(index<0)
1162             return -1;
1163
1164         /* find the position */
1165         pos = st->index_entries[index].pos;
1166
1167     // various attempts to find key frame have failed so far
1168     //    asf_reset_header(s);
1169     //    url_fseek(s->pb, pos, SEEK_SET);
1170     //    key_pos = pos;
1171     //     for(i=0;i<16;i++){
1172     //         pos = url_ftell(s->pb);
1173     //         if (av_read_frame(s, &pkt) < 0){
1174     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1175     //             return -1;
1176     //         }
1177     //         asf_st = s->streams[stream_index]->priv_data;
1178     //         pos += st->parser->frame_offset;
1179     //
1180     //         if (pkt.size > b) {
1181     //             b = pkt.size;
1182     //             key_pos = pos;
1183     //         }
1184     //
1185     //         av_free_packet(&pkt);
1186     //     }
1187
1188         /* do the seek */
1189         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1190         url_fseek(s->pb, pos, SEEK_SET);
1191     }
1192     asf_reset_header(s);
1193     return 0;
1194 }
1195
1196 AVInputFormat asf_demuxer = {
1197     "asf",
1198     NULL_IF_CONFIG_SMALL("ASF format"),
1199     sizeof(ASFContext),
1200     asf_probe,
1201     asf_read_header,
1202     asf_read_packet,
1203     asf_read_close,
1204     asf_read_seek,
1205     asf_read_pts,
1206     .metadata_conv = ff_asf_metadata_conv,
1207 };