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

   1 /*
   2  * ASF compatible demuxer
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 //#define DEBUG
  23
  24 #include "libavutil/common.h"
  25 #include "libavutil/avstring.h"
  26 #include "libavcodec/mpegaudio.h"
  27 #include "avformat.h"
  28 #include "riff.h"
  29 #include "asf.h"
  30 #include "asfcrypt.h"
  31 #include "avlanguage.h"
  32
  33 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  34
  35 #undef NDEBUG
  36 #include <assert.h>
  37
  38 #define ASF_MAX_STREAMS 127
  39 #define FRAME_HEADER_SIZE 17
  40 // Fix Me! FRAME_HEADER_SIZE may be different.
  41
  42 static const ff_asf_guid index_guid = {
  43     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  44 };
  45
  46 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
  47     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  48 };
  49 /**********************************/
  50 /* decoding */
  51
  52 static int guidcmp(const void *g1, const void *g2)
  53 {
  54     return memcmp(g1, g2, sizeof(ff_asf_guid));
  55 }
  56
  57 #ifdef DEBUG
  58 #define PRINT_IF_GUID(g,cmp) \
  59 if (!guidcmp(g, &cmp)) \
  60     dprintf(NULL, "(GUID: %s) ", #cmp)
  61
  62 static void print_guid(const ff_asf_guid *g)
  63 {
  64     int i;
  65     PRINT_IF_GUID(g, ff_asf_header);
  66     else PRINT_IF_GUID(g, ff_asf_file_header);
  67     else PRINT_IF_GUID(g, ff_asf_stream_header);
  68     else PRINT_IF_GUID(g, ff_asf_audio_stream);
  69     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
  70     else PRINT_IF_GUID(g, ff_asf_video_stream);
  71     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
  72     else PRINT_IF_GUID(g, ff_asf_command_stream);
  73     else PRINT_IF_GUID(g, ff_asf_comment_header);
  74     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
  75     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
  76     else PRINT_IF_GUID(g, ff_asf_data_header);
  77     else PRINT_IF_GUID(g, index_guid);
  78     else PRINT_IF_GUID(g, ff_asf_head1_guid);
  79     else PRINT_IF_GUID(g, ff_asf_head2_guid);
  80     else PRINT_IF_GUID(g, ff_asf_my_guid);
  81     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
  82     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
  83     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
  84     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
  85     else PRINT_IF_GUID(g, ff_asf_metadata_header);
  86     else PRINT_IF_GUID(g, ff_asf_marker_header);
  87     else PRINT_IF_GUID(g, stream_bitrate_guid);
  88     else PRINT_IF_GUID(g, ff_asf_language_guid);
  89     else
  90         dprintf(NULL, "(GUID: unknown) ");
  91     for(i=0;i<16;i++)
  92         dprintf(NULL, " 0x%02x,", (*g)[i]);
  93     dprintf(NULL, "}\n");
  94 }
  95 #undef PRINT_IF_GUID
  96 #else
  97 #define print_guid(g)
  98 #endif
  99
 100 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
 101 {
 102     assert(sizeof(*g) == 16);
 103     get_buffer(s, *g, sizeof(*g));
 104 }
 105
 106 #if 0
 107 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
 108 {
 109     int len, c;
 110     char *q;
 111
 112     len = get_le16(pb);
 113     q = buf;
 114     while (len > 0) {
 115         c = get_le16(pb);
 116         if ((q - buf) < buf_size - 1)
 117             *q++ = c;
 118         len--;
 119     }
 120     *q = '\0';
 121 }
 122 #endif
 123
 124 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 125 {
 126     char* q = buf;
 127     while (len > 1) {
 128         uint8_t tmp;
 129         uint32_t ch;
 130
 131         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
 132         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 133     }
 134     if (len > 0)
 135         url_fskip(pb, len);
 136     *q = '\0';
 137 }
 138
 139 static int asf_probe(AVProbeData *pd)
 140 {
 141     /* check file header */
 142     if (!guidcmp(pd->buf, &ff_asf_header))
 143         return AVPROBE_SCORE_MAX;
 144     else
 145         return 0;
 146 }
 147
 148 static int get_value(ByteIOContext *pb, int type){
 149     switch(type){
 150         case 2: return get_le32(pb);
 151         case 3: return get_le32(pb);
 152         case 4: return get_le64(pb);
 153         case 5: return get_le16(pb);
 154         default:return INT_MIN;
 155     }
 156 }
 157
 158 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 159 {
 160     char *value;
 161
 162     if ((unsigned)len >= (UINT_MAX - 1)/2)
 163         return;
 164
 165     value = av_malloc(2*len+1);
 166     if (!value)
 167         return;
 168
 169     if (type == 0) {         // UTF16-LE
 170         get_str16_nolen(s->pb, len, value, 2*len + 1);
 171     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
 172         uint64_t num = get_value(s->pb, type);
 173         snprintf(value, len, "%"PRIu64, num);
 174     } else {
 175         url_fskip(s->pb, len);
 176         av_freep(&value);
 177         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
 178         return;
 179     }
 180     av_metadata_set2(&s->metadata, key, value, 0);
 181     av_freep(&value);
 182 }
 183
 184 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 185 {
 186     ASFContext *asf = s->priv_data;
 187     ff_asf_guid g;
 188     ByteIOContext *pb = s->pb;
 189     AVStream *st;
 190     ASFStream *asf_st;
 191     int size, i;
 192     int64_t gsize;
 193     AVRational dar[128];
 194     uint32_t bitrate[128];
 195
 196     memset(dar, 0, sizeof(dar));
 197     memset(bitrate, 0, sizeof(bitrate));
 198
 199     get_guid(pb, &g);
 200     if (guidcmp(&g, &ff_asf_header))
 201         return -1;
 202     get_le64(pb);
 203     get_le32(pb);
 204     get_byte(pb);
 205     get_byte(pb);
 206     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 207     for(;;) {
 208         uint64_t gpos= url_ftell(pb);
 209         get_guid(pb, &g);
 210         gsize = get_le64(pb);
 211         dprintf(s, "%08"PRIx64": ", gpos);
 212         print_guid(&g);
 213         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 214         if (!guidcmp(&g, &ff_asf_data_header)) {
 215             asf->data_object_offset = url_ftell(pb);
 216             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 217             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 218                 asf->data_object_size = gsize - 24;
 219             } else {
 220                 asf->data_object_size = (uint64_t)-1;
 221             }
 222             break;
 223         }
 224         if (gsize < 24)
 225             return -1;
 226         if (!guidcmp(&g, &ff_asf_file_header)) {
 227             get_guid(pb, &asf->hdr.guid);
 228             asf->hdr.file_size          = get_le64(pb);
 229             asf->hdr.create_time        = get_le64(pb);
 230             asf->nb_packets             = get_le64(pb);
 231             asf->hdr.play_time          = get_le64(pb);
 232             asf->hdr.send_time          = get_le64(pb);
 233             asf->hdr.preroll            = get_le32(pb);
 234             asf->hdr.ignore             = get_le32(pb);
 235             asf->hdr.flags              = get_le32(pb);
 236             asf->hdr.min_pktsize        = get_le32(pb);
 237             asf->hdr.max_pktsize        = get_le32(pb);
 238             asf->hdr.max_bitrate        = get_le32(pb);
 239             s->packet_size = asf->hdr.max_pktsize;
 240         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
 241             enum AVMediaType type;
 242             int type_specific_size, sizeX;
 243             uint64_t total_size;
 244             unsigned int tag1;
 245             int64_t pos1, pos2, start_time;
 246             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 247
 248             if (s->nb_streams == ASF_MAX_STREAMS) {
 249                 av_log(s, AV_LOG_ERROR, "too many streams\n");
 250                 return AVERROR(EINVAL);
 251             }
 252
 253             pos1 = url_ftell(pb);
 254
 255             st = av_new_stream(s, 0);
 256             if (!st)
 257                 return AVERROR(ENOMEM);
 258             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 259             asf_st = av_mallocz(sizeof(ASFStream));
 260             if (!asf_st)
 261                 return AVERROR(ENOMEM);
 262             st->priv_data = asf_st;
 263             start_time = asf->hdr.preroll;
 264
 265             asf_st->stream_language_index = 128; // invalid stream index means no language info
 266
 267             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 268                 st->duration = asf->hdr.play_time /
 269                     (10000000 / 1000) - start_time;
 270             }
 271             get_guid(pb, &g);
 272
 273             test_for_ext_stream_audio = 0;
 274             if (!guidcmp(&g, &ff_asf_audio_stream)) {
 275                 type = AVMEDIA_TYPE_AUDIO;
 276             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
 277                 type = AVMEDIA_TYPE_VIDEO;
 278             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
 279                 type = AVMEDIA_TYPE_DATA;
 280             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 281                 test_for_ext_stream_audio = 1;
 282                 type = AVMEDIA_TYPE_UNKNOWN;
 283             } else {
 284                 return -1;
 285             }
 286             get_guid(pb, &g);
 287             total_size = get_le64(pb);
 288             type_specific_size = get_le32(pb);
 289             get_le32(pb);
 290             st->id = get_le16(pb) & 0x7f; /* stream id */
 291             // mapping of asf ID to AV stream ID;
 292             asf->asfid2avid[st->id] = s->nb_streams - 1;
 293
 294             get_le32(pb);
 295
 296             if (test_for_ext_stream_audio) {
 297                 get_guid(pb, &g);
 298                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 299                     type = AVMEDIA_TYPE_AUDIO;
 300                     is_dvr_ms_audio=1;
 301                     get_guid(pb, &g);
 302                     get_le32(pb);
 303                     get_le32(pb);
 304                     get_le32(pb);
 305                     get_guid(pb, &g);
 306                     get_le32(pb);
 307                 }
 308             }
 309
 310             st->codec->codec_type = type;
 311             if (type == AVMEDIA_TYPE_AUDIO) {
 312                 ff_get_wav_header(pb, st->codec, type_specific_size);
 313                 if (is_dvr_ms_audio) {
 314                     // codec_id and codec_tag are unreliable in dvr_ms
 315                     // files. Set them later by probing stream.
 316                     st->codec->codec_id = CODEC_ID_PROBE;
 317                     st->codec->codec_tag = 0;
 318                 }
 319                 if (st->codec->codec_id == CODEC_ID_AAC) {
 320                     st->need_parsing = AVSTREAM_PARSE_NONE;
 321                 } else {
 322                     st->need_parsing = AVSTREAM_PARSE_FULL;
 323                 }
 324                 /* We have to init the frame size at some point .... */
 325                 pos2 = url_ftell(pb);
 326                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 327                     asf_st->ds_span = get_byte(pb);
 328                     asf_st->ds_packet_size = get_le16(pb);
 329                     asf_st->ds_chunk_size = get_le16(pb);
 330                     get_le16(pb); //ds_data_size
 331                     get_byte(pb); //ds_silence_data
 332                 }
 333                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 334                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 335                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 336                 if (asf_st->ds_span > 1) {
 337                     if (!asf_st->ds_chunk_size
 338                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 339                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 340                         asf_st->ds_span = 0; // disable descrambling
 341                 }
 342                 switch (st->codec->codec_id) {
 343                 case CODEC_ID_MP3:
 344                     st->codec->frame_size = MPA_FRAME_SIZE;
 345                     break;
 346                 case CODEC_ID_PCM_S16LE:
 347                 case CODEC_ID_PCM_S16BE:
 348                 case CODEC_ID_PCM_U16LE:
 349                 case CODEC_ID_PCM_U16BE:
 350                 case CODEC_ID_PCM_S8:
 351                 case CODEC_ID_PCM_U8:
 352                 case CODEC_ID_PCM_ALAW:
 353                 case CODEC_ID_PCM_MULAW:
 354                     st->codec->frame_size = 1;
 355                     break;
 356                 default:
 357                     /* This is probably wrong, but it prevents a crash later */
 358                     st->codec->frame_size = 1;
 359                     break;
 360                 }
 361             } else if (type == AVMEDIA_TYPE_VIDEO) {
 362                 get_le32(pb);
 363                 get_le32(pb);
 364                 get_byte(pb);
 365                 size = get_le16(pb); /* size */
 366                 sizeX= get_le32(pb); /* size */
 367                 st->codec->width = get_le32(pb);
 368                 st->codec->height = get_le32(pb);
 369                 /* not available for asf */
 370                 get_le16(pb); /* panes */
 371                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 372                 tag1 = get_le32(pb);
 373                 url_fskip(pb, 20);
 374 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 375                 size= sizeX;
 376                 if (size > 40) {
 377                     st->codec->extradata_size = size - 40;
 378                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 379                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 380                 }
 381
 382                 /* Extract palette from extradata if bpp <= 8 */
 383                 /* This code assumes that extradata contains only palette */
 384                 /* This is true for all paletted codecs implemented in ffmpeg */
 385                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 386                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 387 #if HAVE_BIGENDIAN
 388                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 389                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 390 #else
 391                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 392                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 393 #endif
 394                     st->codec->palctrl->palette_changed = 1;
 395                 }
 396
 397                 st->codec->codec_tag = tag1;
 398                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
 399                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 400                     st->need_parsing = AVSTREAM_PARSE_FULL;
 401                 if(st->codec->codec_id == CODEC_ID_H264)
 402                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
 403             }
 404             pos2 = url_ftell(pb);
 405             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 406         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
 407             int len1, len2, len3, len4, len5;
 408
 409             len1 = get_le16(pb);
 410             len2 = get_le16(pb);
 411             len3 = get_le16(pb);
 412             len4 = get_le16(pb);
 413             len5 = get_le16(pb);
 414             get_tag(s, "title"    , 0, len1);
 415             get_tag(s, "author"   , 0, len2);
 416             get_tag(s, "copyright", 0, len3);
 417             get_tag(s, "comment"  , 0, len4);
 418             url_fskip(pb, len5);
 419         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
 420             int stream_count = get_le16(pb);
 421             int j;
 422
 423 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 424 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 425             for(j = 0; j < stream_count; j++) {
 426                 int flags, bitrate, stream_id;
 427
 428                 flags= get_le16(pb);
 429                 bitrate= get_le32(pb);
 430                 stream_id= (flags & 0x7f);
 431 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 432                 asf->stream_bitrates[stream_id]= bitrate;
 433             }
 434         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
 435             int j;
 436             int stream_count = get_le16(pb);
 437             for(j = 0; j < stream_count; j++) {
 438                 char lang[6];
 439                 unsigned int lang_len = get_byte(pb);
 440                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
 441                 if (j < 128)
 442                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 443             }
 444         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
 445             int desc_count, i;
 446
 447             desc_count = get_le16(pb);
 448             for(i=0;i<desc_count;i++) {
 449                     int name_len,value_type,value_len;
 450                     char name[1024];
 451
 452                     name_len = get_le16(pb);
 453                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 454                         name_len += 1;
 455                     get_str16_nolen(pb, name_len, name, sizeof(name));
 456                     value_type = get_le16(pb);
 457                     value_len  = get_le16(pb);
 458                     if (!value_type && value_len%2)
 459                         value_len += 1;
 460                     get_tag(s, name, value_type, value_len);
 461             }
 462         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
 463             int n, stream_num, name_len, value_len, value_type, value_num;
 464             n = get_le16(pb);
 465
 466             for(i=0;i<n;i++) {
 467                 char name[1024];
 468
 469                 get_le16(pb); //lang_list_index
 470                 stream_num= get_le16(pb);
 471                 name_len=   get_le16(pb);
 472                 value_type= get_le16(pb);
 473                 value_len=  get_le32(pb);
 474
 475                 get_str16_nolen(pb, name_len, name, sizeof(name));
 476 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 477                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 478                 url_fskip(pb, value_len - 2);
 479
 480                 if(stream_num<128){
 481                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 482                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 483                 }
 484             }
 485         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
 486             int ext_len, payload_ext_ct, stream_ct;
 487             uint32_t ext_d, leak_rate, stream_num;
 488             unsigned int stream_languageid_index;
 489
 490             get_le64(pb); // starttime
 491             get_le64(pb); // endtime
 492             leak_rate = get_le32(pb); // leak-datarate
 493             get_le32(pb); // bucket-datasize
 494             get_le32(pb); // init-bucket-fullness
 495             get_le32(pb); // alt-leak-datarate
 496             get_le32(pb); // alt-bucket-datasize
 497             get_le32(pb); // alt-init-bucket-fullness
 498             get_le32(pb); // max-object-size
 499             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 500             stream_num = get_le16(pb); // stream-num
 501
 502             stream_languageid_index = get_le16(pb); // stream-language-id-index
 503             if (stream_num < 128)
 504                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 505
 506             get_le64(pb); // avg frametime in 100ns units
 507             stream_ct = get_le16(pb); //stream-name-count
 508             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 509
 510             if (stream_num < 128)
 511                 bitrate[stream_num] = leak_rate;
 512
 513             for (i=0; i<stream_ct; i++){
 514                 get_le16(pb);
 515                 ext_len = get_le16(pb);
 516                 url_fseek(pb, ext_len, SEEK_CUR);
 517             }
 518
 519             for (i=0; i<payload_ext_ct; i++){
 520                 get_guid(pb, &g);
 521                 ext_d=get_le16(pb);
 522                 ext_len=get_le32(pb);
 523                 url_fseek(pb, ext_len, SEEK_CUR);
 524             }
 525
 526             // there could be a optional stream properties object to follow
 527             // if so the next iteration will pick it up
 528             continue;
 529         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
 530             int v1, v2;
 531             get_guid(pb, &g);
 532             v1 = get_le32(pb);
 533             v2 = get_le16(pb);
 534             continue;
 535         } else if (!guidcmp(&g, &ff_asf_marker_header)) {
 536             int i, count, name_len;
 537             char name[1024];
 538
 539             get_le64(pb);            // reserved 16 bytes
 540             get_le64(pb);            // ...
 541             count = get_le32(pb);    // markers count
 542             get_le16(pb);            // reserved 2 bytes
 543             name_len = get_le16(pb); // name length
 544             for(i=0;i<name_len;i++){
 545                 get_byte(pb); // skip the name
 546             }
 547
 548             for(i=0;i<count;i++){
 549                 int64_t pres_time;
 550                 int name_len;
 551
 552                 get_le64(pb);             // offset, 8 bytes
 553                 pres_time = get_le64(pb); // presentation time
 554                 get_le16(pb);             // entry length
 555                 get_le32(pb);             // send time
 556                 get_le32(pb);             // flags
 557                 name_len = get_le32(pb);  // name length
 558                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
 559                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
 560             }
 561 #if 0
 562         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
 563             int len, v1, n, num;
 564             char str[256], *q;
 565             char tag[16];
 566
 567             get_guid(pb, &g);
 568             print_guid(&g);
 569
 570             n = get_le32(pb);
 571             for(i=0;i<n;i++) {
 572                 num = get_le16(pb); /* stream number */
 573                 get_str16(pb, str, sizeof(str));
 574                 get_str16(pb, str, sizeof(str));
 575                 len = get_le16(pb);
 576                 q = tag;
 577                 while (len > 0) {
 578                     v1 = get_byte(pb);
 579                     if ((q - tag) < sizeof(tag) - 1)
 580                         *q++ = v1;
 581                     len--;
 582                 }
 583                 *q = '\0';
 584             }
 585 #endif
 586         } else if (url_feof(pb)) {
 587             return -1;
 588         } else {
 589             if (!s->keylen) {
 590                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
 591                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 592                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
 593                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 594                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
 595                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 596                 }
 597             }
 598         }
 599         if(url_ftell(pb) != gpos + gsize)
 600             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
 601         url_fseek(pb, gpos + gsize, SEEK_SET);
 602     }
 603     get_guid(pb, &g);
 604     get_le64(pb);
 605     get_byte(pb);
 606     get_byte(pb);
 607     if (url_feof(pb))
 608         return -1;
 609     asf->data_offset = url_ftell(pb);
 610     asf->packet_size_left = 0;
 611
 612
 613     for(i=0; i<128; i++){
 614         int stream_num= asf->asfid2avid[i];
 615         if(stream_num>=0){
 616             AVStream *st = s->streams[stream_num];
 617             if (!st->codec->bit_rate)
 618                 st->codec->bit_rate = bitrate[i];
 619             if (dar[i].num > 0 && dar[i].den > 0)
 620                 av_reduce(&st->sample_aspect_ratio.num,
 621                           &st->sample_aspect_ratio.den,
 622                           dar[i].num, dar[i].den, INT_MAX);
 623 //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);
 624
 625             // copy and convert language codes to the frontend
 626             if (asf->streams[i].stream_language_index < 128) {
 627                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 628                 if (rfc1766 && strlen(rfc1766) > 1) {
 629                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 630                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 631                     if (iso6392)
 632                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
 633                 }
 634             }
 635         }
 636     }
 637
 638     return 0;
 639 }
 640
 641 #define DO_2BITS(bits, var, defval) \
 642     switch (bits & 3) \
 643     { \
 644     case 3: var = get_le32(pb); rsize += 4; break; \
 645     case 2: var = get_le16(pb); rsize += 2; break; \
 646     case 1: var = get_byte(pb); rsize++; break; \
 647     default: var = defval; break; \
 648     }
 649
 650 /**
 651  * Load a single ASF packet into the demuxer.
 652  * @param s demux context
 653  * @param pb context to read data from
 654  * @return 0 on success, <0 on error
 655  */
 656 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 657 {
 658     ASFContext *asf = s->priv_data;
 659     uint32_t packet_length, padsize;
 660     int rsize = 8;
 661     int c, d, e, off;
 662
 663     // if we do not know packet size, allow skipping up to 32 kB
 664     off= 32768;
 665     if (s->packet_size > 0)
 666         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 667
 668     c=d=e=-1;
 669     while(off-- > 0){
 670         c=d; d=e;
 671         e= get_byte(pb);
 672         if(c == 0x82 && !d && !e)
 673             break;
 674     }
 675
 676     if (c != 0x82) {
 677         /**
 678          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 679          * if the packet sync code above triggers -EAGAIN). This does not
 680          * imply complete -EAGAIN handling support at random positions in
 681          * the stream.
 682          */
 683         if (url_ferror(pb) == AVERROR(EAGAIN))
 684             return AVERROR(EAGAIN);
 685         if (!url_feof(pb))
 686             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 687     }
 688     if ((c & 0x8f) == 0x82) {
 689         if (d || e) {
 690             if (!url_feof(pb))
 691                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 692             return -1;
 693         }
 694         c= get_byte(pb);
 695         d= get_byte(pb);
 696         rsize+=3;
 697     }else{
 698         url_fseek(pb, -1, SEEK_CUR); //FIXME
 699     }
 700
 701     asf->packet_flags    = c;
 702     asf->packet_property = d;
 703
 704     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 705     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 706     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 707
 708     //the following checks prevent overflows and infinite loops
 709     if(!packet_length || packet_length >= (1U<<29)){
 710         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 711         return -1;
 712     }
 713     if(padsize >= packet_length){
 714         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 715         return -1;
 716     }
 717
 718     asf->packet_timestamp = get_le32(pb);
 719     get_le16(pb); /* duration */
 720     // rsize has at least 11 bytes which have to be present
 721
 722     if (asf->packet_flags & 0x01) {
 723         asf->packet_segsizetype = get_byte(pb); rsize++;
 724         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 725     } else {
 726         asf->packet_segments = 1;
 727         asf->packet_segsizetype = 0x80;
 728     }
 729     asf->packet_size_left = packet_length - padsize - rsize;
 730     if (packet_length < asf->hdr.min_pktsize)
 731         padsize += asf->hdr.min_pktsize - packet_length;
 732     asf->packet_padsize = padsize;
 733     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 734     return 0;
 735 }
 736
 737 /**
 738  *
 739  * @return <0 if error
 740  */
 741 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 742     ASFContext *asf = s->priv_data;
 743     int rsize = 1;
 744     int num = get_byte(pb);
 745     int64_t ts0, ts1;
 746
 747     asf->packet_segments--;
 748     asf->packet_key_frame = num >> 7;
 749     asf->stream_index = asf->asfid2avid[num & 0x7f];
 750     // sequence should be ignored!
 751     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 752     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 753     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 754 //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);
 755     if (asf->packet_replic_size >= 8) {
 756         asf->packet_obj_size = get_le32(pb);
 757         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 758             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 759             return -1;
 760         }
 761         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 762         if(asf->packet_replic_size >= 8+38+4){
 763 //            for(i=0; i<asf->packet_replic_size-8; i++)
 764 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 765 //            av_log(s, AV_LOG_DEBUG, "\n");
 766             url_fskip(pb, 10);
 767             ts0= get_le64(pb);
 768             ts1= get_le64(pb);
 769             url_fskip(pb, 12);
 770             get_le32(pb);
 771             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 772             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 773             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 774         }else
 775             url_fskip(pb, asf->packet_replic_size - 8);
 776         rsize += asf->packet_replic_size; // FIXME - check validity
 777     } else if (asf->packet_replic_size==1){
 778         // multipacket - frag_offset is beginning timestamp
 779         asf->packet_time_start = asf->packet_frag_offset;
 780         asf->packet_frag_offset = 0;
 781         asf->packet_frag_timestamp = asf->packet_timestamp;
 782
 783         asf->packet_time_delta = get_byte(pb);
 784         rsize++;
 785     }else if(asf->packet_replic_size!=0){
 786         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 787         return -1;
 788     }
 789     if (asf->packet_flags & 0x01) {
 790         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 791         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 792             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 793             return -1;
 794         }
 795         //printf("Fragsize %d\n", asf->packet_frag_size);
 796     } else {
 797         asf->packet_frag_size = asf->packet_size_left - rsize;
 798         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 799     }
 800     if (asf->packet_replic_size == 1) {
 801         asf->packet_multi_size = asf->packet_frag_size;
 802         if (asf->packet_multi_size > asf->packet_size_left)
 803             return -1;
 804     }
 805     asf->packet_size_left -= rsize;
 806     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 807
 808     return 0;
 809 }
 810
 811 /**
 812  * Parse data from individual ASF packets (which were previously loaded
 813  * with asf_get_packet()).
 814  * @param s demux context
 815  * @param pb context to read data from
 816  * @param pkt pointer to store packet data into
 817  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
 818  *          packets need to be loaded (through asf_get_packet())
 819  */
 820 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 821 {
 822     ASFContext *asf = s->priv_data;
 823     ASFStream *asf_st = 0;
 824     for (;;) {
 825         if(url_feof(pb))
 826             return AVERROR_EOF;
 827         if (asf->packet_size_left < FRAME_HEADER_SIZE
 828             || asf->packet_segments < 1) {
 829             //asf->packet_size_left <= asf->packet_padsize) {
 830             int ret = asf->packet_size_left + asf->packet_padsize;
 831             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 832             assert(ret>=0);
 833             /* fail safe */
 834             url_fskip(pb, ret);
 835
 836             asf->packet_pos= url_ftell(pb);
 837             if (asf->data_object_size != (uint64_t)-1 &&
 838                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 839                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 840             return 1;
 841         }
 842         if (asf->packet_time_start == 0) {
 843             if(asf_read_frame_header(s, pb) < 0){
 844                 asf->packet_segments= 0;
 845                 continue;
 846             }
 847             if (asf->stream_index < 0
 848                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 849                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 850                 ) {
 851                 asf->packet_time_start = 0;
 852                 /* unhandled packet (should not happen) */
 853                 url_fskip(pb, asf->packet_frag_size);
 854                 asf->packet_size_left -= asf->packet_frag_size;
 855                 if(asf->stream_index < 0)
 856                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 857                 continue;
 858             }
 859             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 860         }
 861         asf_st = asf->asf_st;
 862
 863         if (asf->packet_replic_size == 1) {
 864             // frag_offset is here used as the beginning timestamp
 865             asf->packet_frag_timestamp = asf->packet_time_start;
 866             asf->packet_time_start += asf->packet_time_delta;
 867             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 868             asf->packet_size_left--;
 869             asf->packet_multi_size--;
 870             if (asf->packet_multi_size < asf->packet_obj_size)
 871             {
 872                 asf->packet_time_start = 0;
 873                 url_fskip(pb, asf->packet_multi_size);
 874                 asf->packet_size_left -= asf->packet_multi_size;
 875                 continue;
 876             }
 877             asf->packet_multi_size -= asf->packet_obj_size;
 878             //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);
 879         }
 880         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 881               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 882            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 883             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 884                 asf_st->frag_offset, asf->packet_frag_size,
 885                 asf->packet_obj_size, asf_st->pkt.size);
 886             asf->packet_obj_size= asf_st->pkt.size;
 887         }
 888
 889         if (   asf_st->pkt.size != asf->packet_obj_size
 890             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 891             if(asf_st->pkt.data){
 892                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 893                 asf_st->frag_offset = 0;
 894                 av_free_packet(&asf_st->pkt);
 895             }
 896             /* new packet */
 897             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 898             asf_st->seq = asf->packet_seq;
 899             asf_st->pkt.dts = asf->packet_frag_timestamp;
 900             asf_st->pkt.stream_index = asf->stream_index;
 901             asf_st->pkt.pos =
 902             asf_st->packet_pos= asf->packet_pos;
 903 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 904 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
 905 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
 906             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 907                 asf->packet_key_frame = 1;
 908             if (asf->packet_key_frame)
 909                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
 910         }
 911
 912         /* read data */
 913         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 914         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 915         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 916         asf->packet_size_left -= asf->packet_frag_size;
 917         if (asf->packet_size_left < 0)
 918             continue;
 919
 920         if(   asf->packet_frag_offset >= asf_st->pkt.size
 921            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 922             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 923                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 924             continue;
 925         }
 926
 927         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 928                    asf->packet_frag_size);
 929         if (s->key && s->keylen == 20)
 930             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 931                             asf->packet_frag_size);
 932         asf_st->frag_offset += asf->packet_frag_size;
 933         /* test if whole packet is read */
 934         if (asf_st->frag_offset == asf_st->pkt.size) {
 935             //workaround for macroshit radio DVR-MS files
 936             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 937                && asf_st->pkt.size > 100){
 938                 int i;
 939                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 940                 if(i == asf_st->pkt.size){
 941                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 942                     asf_st->frag_offset = 0;
 943                     av_free_packet(&asf_st->pkt);
 944                     continue;
 945                 }
 946             }
 947
 948             /* return packet */
 949             if (asf_st->ds_span > 1) {
 950               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 951                     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);
 952               }else{
 953                 /* packet descrambling */
 954                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 955                 if (newdata) {
 956                     int offset = 0;
 957                     while (offset < asf_st->pkt.size) {
 958                         int off = offset / asf_st->ds_chunk_size;
 959                         int row = off / asf_st->ds_span;
 960                         int col = off % asf_st->ds_span;
 961                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 962                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 963
 964                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 965                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 966                         memcpy(newdata + offset,
 967                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 968                                asf_st->ds_chunk_size);
 969                         offset += asf_st->ds_chunk_size;
 970                     }
 971                     av_free(asf_st->pkt.data);
 972                     asf_st->pkt.data = newdata;
 973                 }
 974               }
 975             }
 976             asf_st->frag_offset = 0;
 977             *pkt= asf_st->pkt;
 978             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 979             asf_st->pkt.size = 0;
 980             asf_st->pkt.data = 0;
 981             break; // packet completed
 982         }
 983     }
 984     return 0;
 985 }
 986
 987 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 988 {
 989     ASFContext *asf = s->priv_data;
 990
 991     for (;;) {
 992         int ret;
 993
 994         /* parse cached packets, if any */
 995         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 996             return ret;
 997         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 998             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 999         asf->packet_time_start = 0;
1000     }
1001
1002     return 0;
1003 }
1004
1005 // Added to support seeking after packets have been read
1006 // If information is not reset, read_packet fails due to
1007 // leftover information from previous reads
1008 static void asf_reset_header(AVFormatContext *s)
1009 {
1010     ASFContext *asf = s->priv_data;
1011     ASFStream *asf_st;
1012     int i;
1013
1014     asf->packet_nb_frames = 0;
1015     asf->packet_size_left = 0;
1016     asf->packet_segments = 0;
1017     asf->packet_flags = 0;
1018     asf->packet_property = 0;
1019     asf->packet_timestamp = 0;
1020     asf->packet_segsizetype = 0;
1021     asf->packet_segments = 0;
1022     asf->packet_seq = 0;
1023     asf->packet_replic_size = 0;
1024     asf->packet_key_frame = 0;
1025     asf->packet_padsize = 0;
1026     asf->packet_frag_offset = 0;
1027     asf->packet_frag_size = 0;
1028     asf->packet_frag_timestamp = 0;
1029     asf->packet_multi_size = 0;
1030     asf->packet_obj_size = 0;
1031     asf->packet_time_delta = 0;
1032     asf->packet_time_start = 0;
1033
1034     for(i=0; i<s->nb_streams; i++){
1035         asf_st= s->streams[i]->priv_data;
1036         av_free_packet(&asf_st->pkt);
1037         asf_st->frag_offset=0;
1038         asf_st->seq=0;
1039     }
1040     asf->asf_st= NULL;
1041 }
1042
1043 static int asf_read_close(AVFormatContext *s)
1044 {
1045     int i;
1046
1047     asf_reset_header(s);
1048     for(i=0;i<s->nb_streams;i++) {
1049         AVStream *st = s->streams[i];
1050         av_free(st->codec->palctrl);
1051     }
1052     return 0;
1053 }
1054
1055 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1056 {
1057     AVPacket pkt1, *pkt = &pkt1;
1058     ASFStream *asf_st;
1059     int64_t pts;
1060     int64_t pos= *ppos;
1061     int i;
1062     int64_t start_pos[ASF_MAX_STREAMS];
1063
1064     for(i=0; i<s->nb_streams; i++){
1065         start_pos[i]= pos;
1066     }
1067
1068     if (s->packet_size > 0)
1069         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1070     *ppos= pos;
1071     url_fseek(s->pb, pos, SEEK_SET);
1072
1073 //printf("asf_read_pts\n");
1074     asf_reset_header(s);
1075     for(;;){
1076         if (av_read_frame(s, pkt) < 0){
1077             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1078             return AV_NOPTS_VALUE;
1079         }
1080
1081         pts= pkt->pts;
1082
1083         av_free_packet(pkt);
1084         if(pkt->flags&AV_PKT_FLAG_KEY){
1085             i= pkt->stream_index;
1086
1087             asf_st= s->streams[i]->priv_data;
1088
1089 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1090             pos= asf_st->packet_pos;
1091
1092             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1093             start_pos[i]= asf_st->packet_pos + 1;
1094
1095             if(pkt->stream_index == stream_index)
1096                break;
1097         }
1098     }
1099
1100     *ppos= pos;
1101 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1102
1103     return pts;
1104 }
1105
1106 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1107 {
1108     ff_asf_guid g;
1109     ASFContext *asf = s->priv_data;
1110     int64_t current_pos= url_ftell(s->pb);
1111     int i;
1112
1113     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1114     get_guid(s->pb, &g);
1115     if (!guidcmp(&g, &index_guid)) {
1116         int64_t itime, last_pos=-1;
1117         int pct, ict;
1118         int64_t av_unused gsize= get_le64(s->pb);
1119         get_guid(s->pb, &g);
1120         itime=get_le64(s->pb);
1121         pct=get_le32(s->pb);
1122         ict=get_le32(s->pb);
1123         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1124
1125         for (i=0;i<ict;i++){
1126             int pktnum=get_le32(s->pb);
1127             int pktct =get_le16(s->pb);
1128             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1129             int64_t index_pts= av_rescale(itime, i, 10000);
1130
1131             if(pos != last_pos){
1132             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1133             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1134             last_pos=pos;
1135             }
1136         }
1137         asf->index_read= 1;
1138     }
1139     url_fseek(s->pb, current_pos, SEEK_SET);
1140 }
1141
1142 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1143 {
1144     ASFContext *asf = s->priv_data;
1145     AVStream *st = s->streams[stream_index];
1146     int64_t pos;
1147     int index;
1148
1149     if (s->packet_size <= 0)
1150         return -1;
1151
1152     /* Try using the protocol's read_seek if available */
1153     if(s->pb) {
1154         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1155         if(ret >= 0)
1156             asf_reset_header(s);
1157         if (ret != AVERROR(ENOSYS))
1158             return ret;
1159     }
1160
1161     if (!asf->index_read)
1162         asf_build_simple_index(s, stream_index);
1163
1164     if(!(asf->index_read && st->index_entries)){
1165         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1166             return -1;
1167     }else{
1168         index= av_index_search_timestamp(st, pts, flags);
1169         if(index<0)
1170             return -1;
1171
1172         /* find the position */
1173         pos = st->index_entries[index].pos;
1174
1175     // various attempts to find key frame have failed so far
1176     //    asf_reset_header(s);
1177     //    url_fseek(s->pb, pos, SEEK_SET);
1178     //    key_pos = pos;
1179     //     for(i=0;i<16;i++){
1180     //         pos = url_ftell(s->pb);
1181     //         if (av_read_frame(s, &pkt) < 0){
1182     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1183     //             return -1;
1184     //         }
1185     //         asf_st = s->streams[stream_index]->priv_data;
1186     //         pos += st->parser->frame_offset;
1187     //
1188     //         if (pkt.size > b) {
1189     //             b = pkt.size;
1190     //             key_pos = pos;
1191     //         }
1192     //
1193     //         av_free_packet(&pkt);
1194     //     }
1195
1196         /* do the seek */
1197         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1198         url_fseek(s->pb, pos, SEEK_SET);
1199     }
1200     asf_reset_header(s);
1201     return 0;
1202 }
1203
1204 AVInputFormat asf_demuxer = {
1205     "asf",
1206     NULL_IF_CONFIG_SMALL("ASF format"),
1207     sizeof(ASFContext),
1208     asf_probe,
1209     asf_read_header,
1210     asf_read_packet,
1211     asf_read_close,
1212     asf_read_seek,
1213     asf_read_pts,
1214     .metadata_conv = ff_asf_metadata_conv,
1215 };