tizen/distrib/ffmpeg/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             }
 396             pos2 = url_ftell(pb);
 397             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 398         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
 399             int len1, len2, len3, len4, len5;
 400
 401             len1 = get_le16(pb);
 402             len2 = get_le16(pb);
 403             len3 = get_le16(pb);
 404             len4 = get_le16(pb);
 405             len5 = get_le16(pb);
 406             get_tag(s, "title"    , 0, len1);
 407             get_tag(s, "author"   , 0, len2);
 408             get_tag(s, "copyright", 0, len3);
 409             get_tag(s, "comment"  , 0, len4);
 410             url_fskip(pb, len5);
 411         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
 412             int stream_count = get_le16(pb);
 413             int j;
 414
 415 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 416 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 417             for(j = 0; j < stream_count; j++) {
 418                 int flags, bitrate, stream_id;
 419
 420                 flags= get_le16(pb);
 421                 bitrate= get_le32(pb);
 422                 stream_id= (flags & 0x7f);
 423 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 424                 asf->stream_bitrates[stream_id]= bitrate;
 425             }
 426         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
 427             int j;
 428             int stream_count = get_le16(pb);
 429             for(j = 0; j < stream_count; j++) {
 430                 char lang[6];
 431                 unsigned int lang_len = get_byte(pb);
 432                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
 433                 if (j < 128)
 434                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 435             }
 436         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
 437             int desc_count, i;
 438
 439             desc_count = get_le16(pb);
 440             for(i=0;i<desc_count;i++) {
 441                     int name_len,value_type,value_len;
 442                     char name[1024];
 443
 444                     name_len = get_le16(pb);
 445                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 446                         name_len += 1;
 447                     get_str16_nolen(pb, name_len, name, sizeof(name));
 448                     value_type = get_le16(pb);
 449                     value_len  = get_le16(pb);
 450                     if (!value_type && value_len%2)
 451                         value_len += 1;
 452                     get_tag(s, name, value_type, value_len);
 453             }
 454         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
 455             int n, stream_num, name_len, value_len, value_type, value_num;
 456             n = get_le16(pb);
 457
 458             for(i=0;i<n;i++) {
 459                 char name[1024];
 460
 461                 get_le16(pb); //lang_list_index
 462                 stream_num= get_le16(pb);
 463                 name_len=   get_le16(pb);
 464                 value_type= get_le16(pb);
 465                 value_len=  get_le32(pb);
 466
 467                 get_str16_nolen(pb, name_len, name, sizeof(name));
 468 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 469                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 470                 url_fskip(pb, value_len - 2);
 471
 472                 if(stream_num<128){
 473                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 474                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 475                 }
 476             }
 477         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
 478             int ext_len, payload_ext_ct, stream_ct;
 479             uint32_t ext_d, leak_rate, stream_num;
 480             unsigned int stream_languageid_index;
 481
 482             get_le64(pb); // starttime
 483             get_le64(pb); // endtime
 484             leak_rate = get_le32(pb); // leak-datarate
 485             get_le32(pb); // bucket-datasize
 486             get_le32(pb); // init-bucket-fullness
 487             get_le32(pb); // alt-leak-datarate
 488             get_le32(pb); // alt-bucket-datasize
 489             get_le32(pb); // alt-init-bucket-fullness
 490             get_le32(pb); // max-object-size
 491             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 492             stream_num = get_le16(pb); // stream-num
 493
 494             stream_languageid_index = get_le16(pb); // stream-language-id-index
 495             if (stream_num < 128)
 496                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 497
 498             get_le64(pb); // avg frametime in 100ns units
 499             stream_ct = get_le16(pb); //stream-name-count
 500             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 501
 502             if (stream_num < 128)
 503                 bitrate[stream_num] = leak_rate;
 504
 505             for (i=0; i<stream_ct; i++){
 506                 get_le16(pb);
 507                 ext_len = get_le16(pb);
 508                 url_fseek(pb, ext_len, SEEK_CUR);
 509             }
 510
 511             for (i=0; i<payload_ext_ct; i++){
 512                 get_guid(pb, &g);
 513                 ext_d=get_le16(pb);
 514                 ext_len=get_le32(pb);
 515                 url_fseek(pb, ext_len, SEEK_CUR);
 516             }
 517
 518             // there could be a optional stream properties object to follow
 519             // if so the next iteration will pick it up
 520         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
 521             int v1, v2;
 522             get_guid(pb, &g);
 523             v1 = get_le32(pb);
 524             v2 = get_le16(pb);
 525         } else if (!guidcmp(&g, &ff_asf_marker_header)) {
 526             int i, count, name_len;
 527             char name[1024];
 528
 529             get_le64(pb);            // reserved 16 bytes
 530             get_le64(pb);            // ...
 531             count = get_le32(pb);    // markers count
 532             get_le16(pb);            // reserved 2 bytes
 533             name_len = get_le16(pb); // name length
 534             for(i=0;i<name_len;i++){
 535                 get_byte(pb); // skip the name
 536             }
 537
 538             for(i=0;i<count;i++){
 539                 int64_t pres_time;
 540                 int name_len;
 541
 542                 get_le64(pb);             // offset, 8 bytes
 543                 pres_time = get_le64(pb); // presentation time
 544                 get_le16(pb);             // entry length
 545                 get_le32(pb);             // send time
 546                 get_le32(pb);             // flags
 547                 name_len = get_le32(pb);  // name length
 548                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
 549                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
 550             }
 551 #if 0
 552         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
 553             int len, v1, n, num;
 554             char str[256], *q;
 555             char tag[16];
 556
 557             get_guid(pb, &g);
 558             print_guid(&g);
 559
 560             n = get_le32(pb);
 561             for(i=0;i<n;i++) {
 562                 num = get_le16(pb); /* stream number */
 563                 get_str16(pb, str, sizeof(str));
 564                 get_str16(pb, str, sizeof(str));
 565                 len = get_le16(pb);
 566                 q = tag;
 567                 while (len > 0) {
 568                     v1 = get_byte(pb);
 569                     if ((q - tag) < sizeof(tag) - 1)
 570                         *q++ = v1;
 571                     len--;
 572                 }
 573                 *q = '\0';
 574             }
 575 #endif
 576         } else if (url_feof(pb)) {
 577             return -1;
 578         } else {
 579             if (!s->keylen) {
 580                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
 581                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 582                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
 583                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 584                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
 585                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 586                 }
 587             }
 588         }
 589         if(url_ftell(pb) != gpos + gsize)
 590             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
 591         url_fseek(pb, gpos + gsize, SEEK_SET);
 592     }
 593     get_guid(pb, &g);
 594     get_le64(pb);
 595     get_byte(pb);
 596     get_byte(pb);
 597     if (url_feof(pb))
 598         return -1;
 599     asf->data_offset = url_ftell(pb);
 600     asf->packet_size_left = 0;
 601
 602
 603     for(i=0; i<128; i++){
 604         int stream_num= asf->asfid2avid[i];
 605         if(stream_num>=0){
 606             AVStream *st = s->streams[stream_num];
 607             if (!st->codec->bit_rate)
 608                 st->codec->bit_rate = bitrate[i];
 609             if (dar[i].num > 0 && dar[i].den > 0)
 610                 av_reduce(&st->sample_aspect_ratio.num,
 611                           &st->sample_aspect_ratio.den,
 612                           dar[i].num, dar[i].den, INT_MAX);
 613 //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);
 614
 615             // copy and convert language codes to the frontend
 616             if (asf->streams[i].stream_language_index < 128) {
 617                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 618                 if (rfc1766 && strlen(rfc1766) > 1) {
 619                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 620                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 621                     if (iso6392)
 622                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
 623                 }
 624             }
 625         }
 626     }
 627
 628     return 0;
 629 }
 630
 631 #define DO_2BITS(bits, var, defval) \
 632     switch (bits & 3) \
 633     { \
 634     case 3: var = get_le32(pb); rsize += 4; break; \
 635     case 2: var = get_le16(pb); rsize += 2; break; \
 636     case 1: var = get_byte(pb); rsize++; break; \
 637     default: var = defval; break; \
 638     }
 639
 640 /**
 641  * Load a single ASF packet into the demuxer.
 642  * @param s demux context
 643  * @param pb context to read data from
 644  * @return 0 on success, <0 on error
 645  */
 646 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 647 {
 648     ASFContext *asf = s->priv_data;
 649     uint32_t packet_length, padsize;
 650     int rsize = 8;
 651     int c, d, e, off;
 652
 653     // if we do not know packet size, allow skipping up to 32 kB
 654     off= 32768;
 655     if (s->packet_size > 0)
 656         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 657
 658     c=d=e=-1;
 659     while(off-- > 0){
 660         c=d; d=e;
 661         e= get_byte(pb);
 662         if(c == 0x82 && !d && !e)
 663             break;
 664     }
 665
 666     if (c != 0x82) {
 667         /**
 668          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 669          * if the packet sync code above triggers -EAGAIN). This does not
 670          * imply complete -EAGAIN handling support at random positions in
 671          * the stream.
 672          */
 673         if (url_ferror(pb) == AVERROR(EAGAIN))
 674             return AVERROR(EAGAIN);
 675         if (!url_feof(pb))
 676             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 677     }
 678     if ((c & 0x8f) == 0x82) {
 679         if (d || e) {
 680             if (!url_feof(pb))
 681                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 682             return -1;
 683         }
 684         c= get_byte(pb);
 685         d= get_byte(pb);
 686         rsize+=3;
 687     }else{
 688         url_fseek(pb, -1, SEEK_CUR); //FIXME
 689     }
 690
 691     asf->packet_flags    = c;
 692     asf->packet_property = d;
 693
 694     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 695     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 696     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 697
 698     //the following checks prevent overflows and infinite loops
 699     if(!packet_length || packet_length >= (1U<<29)){
 700         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 701         return -1;
 702     }
 703     if(padsize >= packet_length){
 704         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 705         return -1;
 706     }
 707
 708     asf->packet_timestamp = get_le32(pb);
 709     get_le16(pb); /* duration */
 710     // rsize has at least 11 bytes which have to be present
 711
 712     if (asf->packet_flags & 0x01) {
 713         asf->packet_segsizetype = get_byte(pb); rsize++;
 714         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 715     } else {
 716         asf->packet_segments = 1;
 717         asf->packet_segsizetype = 0x80;
 718     }
 719     asf->packet_size_left = packet_length - padsize - rsize;
 720     if (packet_length < asf->hdr.min_pktsize)
 721         padsize += asf->hdr.min_pktsize - packet_length;
 722     asf->packet_padsize = padsize;
 723     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 724     return 0;
 725 }
 726
 727 /**
 728  *
 729  * @return <0 if error
 730  */
 731 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 732     ASFContext *asf = s->priv_data;
 733     int rsize = 1;
 734     int num = get_byte(pb);
 735     int64_t ts0, ts1;
 736
 737     asf->packet_segments--;
 738     asf->packet_key_frame = num >> 7;
 739     asf->stream_index = asf->asfid2avid[num & 0x7f];
 740     // sequence should be ignored!
 741     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 742     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 743     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 744 //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);
 745     if (asf->packet_replic_size >= 8) {
 746         asf->packet_obj_size = get_le32(pb);
 747         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 748             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 749             return -1;
 750         }
 751         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 752         if(asf->packet_replic_size >= 8+38+4){
 753 //            for(i=0; i<asf->packet_replic_size-8; i++)
 754 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 755 //            av_log(s, AV_LOG_DEBUG, "\n");
 756             url_fskip(pb, 10);
 757             ts0= get_le64(pb);
 758             ts1= get_le64(pb);
 759             url_fskip(pb, 12);
 760             get_le32(pb);
 761             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 762             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 763             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 764         }else
 765             url_fskip(pb, asf->packet_replic_size - 8);
 766         rsize += asf->packet_replic_size; // FIXME - check validity
 767     } else if (asf->packet_replic_size==1){
 768         // multipacket - frag_offset is beginning timestamp
 769         asf->packet_time_start = asf->packet_frag_offset;
 770         asf->packet_frag_offset = 0;
 771         asf->packet_frag_timestamp = asf->packet_timestamp;
 772
 773         asf->packet_time_delta = get_byte(pb);
 774         rsize++;
 775     }else if(asf->packet_replic_size!=0){
 776         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 777         return -1;
 778     }
 779     if (asf->packet_flags & 0x01) {
 780         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 781         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 782             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 783             return -1;
 784         }
 785         //printf("Fragsize %d\n", asf->packet_frag_size);
 786     } else {
 787         asf->packet_frag_size = asf->packet_size_left - rsize;
 788         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 789     }
 790     if (asf->packet_replic_size == 1) {
 791         asf->packet_multi_size = asf->packet_frag_size;
 792         if (asf->packet_multi_size > asf->packet_size_left)
 793             return -1;
 794     }
 795     asf->packet_size_left -= rsize;
 796     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 797
 798     return 0;
 799 }
 800
 801 /**
 802  * Parse data from individual ASF packets (which were previously loaded
 803  * with asf_get_packet()).
 804  * @param s demux context
 805  * @param pb context to read data from
 806  * @param pkt pointer to store packet data into
 807  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
 808  *          packets need to be loaded (through asf_get_packet())
 809  */
 810 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 811 {
 812     ASFContext *asf = s->priv_data;
 813     ASFStream *asf_st = 0;
 814     for (;;) {
 815         if(url_feof(pb))
 816             return AVERROR_EOF;
 817         if (asf->packet_size_left < FRAME_HEADER_SIZE
 818             || asf->packet_segments < 1) {
 819             //asf->packet_size_left <= asf->packet_padsize) {
 820             int ret = asf->packet_size_left + asf->packet_padsize;
 821             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 822             assert(ret>=0);
 823             /* fail safe */
 824             url_fskip(pb, ret);
 825
 826             asf->packet_pos= url_ftell(pb);
 827             if (asf->data_object_size != (uint64_t)-1 &&
 828                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 829                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 830             return 1;
 831         }
 832         if (asf->packet_time_start == 0) {
 833             if(asf_read_frame_header(s, pb) < 0){
 834                 asf->packet_segments= 0;
 835                 continue;
 836             }
 837             if (asf->stream_index < 0
 838                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 839                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 840                 ) {
 841                 asf->packet_time_start = 0;
 842                 /* unhandled packet (should not happen) */
 843                 url_fskip(pb, asf->packet_frag_size);
 844                 asf->packet_size_left -= asf->packet_frag_size;
 845                 if(asf->stream_index < 0)
 846                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 847                 continue;
 848             }
 849             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 850         }
 851         asf_st = asf->asf_st;
 852
 853         if (asf->packet_replic_size == 1) {
 854             // frag_offset is here used as the beginning timestamp
 855             asf->packet_frag_timestamp = asf->packet_time_start;
 856             asf->packet_time_start += asf->packet_time_delta;
 857             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 858             asf->packet_size_left--;
 859             asf->packet_multi_size--;
 860             if (asf->packet_multi_size < asf->packet_obj_size)
 861             {
 862                 asf->packet_time_start = 0;
 863                 url_fskip(pb, asf->packet_multi_size);
 864                 asf->packet_size_left -= asf->packet_multi_size;
 865                 continue;
 866             }
 867             asf->packet_multi_size -= asf->packet_obj_size;
 868             //printf("COMPRESS size  %d  %d  %d   ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
 869         }
 870         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 871               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 872            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 873             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 874                 asf_st->frag_offset, asf->packet_frag_size,
 875                 asf->packet_obj_size, asf_st->pkt.size);
 876             asf->packet_obj_size= asf_st->pkt.size;
 877         }
 878
 879         if (   asf_st->pkt.size != asf->packet_obj_size
 880             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 881             if(asf_st->pkt.data){
 882                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 883                 asf_st->frag_offset = 0;
 884                 av_free_packet(&asf_st->pkt);
 885             }
 886             /* new packet */
 887             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 888             asf_st->seq = asf->packet_seq;
 889             asf_st->pkt.dts = asf->packet_frag_timestamp;
 890             asf_st->pkt.stream_index = asf->stream_index;
 891             asf_st->pkt.pos =
 892             asf_st->packet_pos= asf->packet_pos;
 893 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 894 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
 895 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
 896             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 897                 asf->packet_key_frame = 1;
 898             if (asf->packet_key_frame)
 899                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
 900         }
 901
 902         /* read data */
 903         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 904         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 905         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 906         asf->packet_size_left -= asf->packet_frag_size;
 907         if (asf->packet_size_left < 0)
 908             continue;
 909
 910         if(   asf->packet_frag_offset >= asf_st->pkt.size
 911            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 912             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 913                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 914             continue;
 915         }
 916
 917         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 918                    asf->packet_frag_size);
 919         if (s->key && s->keylen == 20)
 920             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 921                             asf->packet_frag_size);
 922         asf_st->frag_offset += asf->packet_frag_size;
 923         /* test if whole packet is read */
 924         if (asf_st->frag_offset == asf_st->pkt.size) {
 925             //workaround for macroshit radio DVR-MS files
 926             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 927                && asf_st->pkt.size > 100){
 928                 int i;
 929                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 930                 if(i == asf_st->pkt.size){
 931                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 932                     asf_st->frag_offset = 0;
 933                     av_free_packet(&asf_st->pkt);
 934                     continue;
 935                 }
 936             }
 937
 938             /* return packet */
 939             if (asf_st->ds_span > 1) {
 940               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 941                     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);
 942               }else{
 943                 /* packet descrambling */
 944                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 945                 if (newdata) {
 946                     int offset = 0;
 947                     while (offset < asf_st->pkt.size) {
 948                         int off = offset / asf_st->ds_chunk_size;
 949                         int row = off / asf_st->ds_span;
 950                         int col = off % asf_st->ds_span;
 951                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 952                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 953
 954                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 955                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 956                         memcpy(newdata + offset,
 957                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 958                                asf_st->ds_chunk_size);
 959                         offset += asf_st->ds_chunk_size;
 960                     }
 961                     av_free(asf_st->pkt.data);
 962                     asf_st->pkt.data = newdata;
 963                 }
 964               }
 965             }
 966             asf_st->frag_offset = 0;
 967             *pkt= asf_st->pkt;
 968             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 969             asf_st->pkt.size = 0;
 970             asf_st->pkt.data = 0;
 971             break; // packet completed
 972         }
 973     }
 974     return 0;
 975 }
 976
 977 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 978 {
 979     ASFContext *asf = s->priv_data;
 980
 981     for (;;) {
 982         int ret;
 983
 984         /* parse cached packets, if any */
 985         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 986             return ret;
 987         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 988             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 989         asf->packet_time_start = 0;
 990     }
 991
 992     return 0;
 993 }
 994
 995 // Added to support seeking after packets have been read
 996 // If information is not reset, read_packet fails due to
 997 // leftover information from previous reads
 998 static void asf_reset_header(AVFormatContext *s)
 999 {
1000     ASFContext *asf = s->priv_data;
1001     ASFStream *asf_st;
1002     int i;
1003
1004     asf->packet_nb_frames = 0;
1005     asf->packet_size_left = 0;
1006     asf->packet_segments = 0;
1007     asf->packet_flags = 0;
1008     asf->packet_property = 0;
1009     asf->packet_timestamp = 0;
1010     asf->packet_segsizetype = 0;
1011     asf->packet_segments = 0;
1012     asf->packet_seq = 0;
1013     asf->packet_replic_size = 0;
1014     asf->packet_key_frame = 0;
1015     asf->packet_padsize = 0;
1016     asf->packet_frag_offset = 0;
1017     asf->packet_frag_size = 0;
1018     asf->packet_frag_timestamp = 0;
1019     asf->packet_multi_size = 0;
1020     asf->packet_obj_size = 0;
1021     asf->packet_time_delta = 0;
1022     asf->packet_time_start = 0;
1023
1024     for(i=0; i<s->nb_streams; i++){
1025         asf_st= s->streams[i]->priv_data;
1026         av_free_packet(&asf_st->pkt);
1027         asf_st->frag_offset=0;
1028         asf_st->seq=0;
1029     }
1030     asf->asf_st= NULL;
1031 }
1032
1033 static int asf_read_close(AVFormatContext *s)
1034 {
1035     int i;
1036
1037     asf_reset_header(s);
1038     for(i=0;i<s->nb_streams;i++) {
1039         AVStream *st = s->streams[i];
1040         av_free(st->codec->palctrl);
1041     }
1042     return 0;
1043 }
1044
1045 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1046 {
1047     AVPacket pkt1, *pkt = &pkt1;
1048     ASFStream *asf_st;
1049     int64_t pts;
1050     int64_t pos= *ppos;
1051     int i;
1052     int64_t start_pos[s->nb_streams];
1053
1054     for(i=0; i<s->nb_streams; i++){
1055         start_pos[i]= pos;
1056     }
1057
1058     if (s->packet_size > 0)
1059         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1060     *ppos= pos;
1061     url_fseek(s->pb, pos, SEEK_SET);
1062
1063 //printf("asf_read_pts\n");
1064     asf_reset_header(s);
1065     for(;;){
1066         if (av_read_frame(s, pkt) < 0){
1067             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1068             return AV_NOPTS_VALUE;
1069         }
1070
1071         pts= pkt->pts;
1072
1073         av_free_packet(pkt);
1074         if(pkt->flags&AV_PKT_FLAG_KEY){
1075             i= pkt->stream_index;
1076
1077             asf_st= s->streams[i]->priv_data;
1078
1079 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1080             pos= asf_st->packet_pos;
1081
1082             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1083             start_pos[i]= asf_st->packet_pos + 1;
1084
1085             if(pkt->stream_index == stream_index)
1086                break;
1087         }
1088     }
1089
1090     *ppos= pos;
1091 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1092
1093     return pts;
1094 }
1095
1096 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1097 {
1098     ff_asf_guid g;
1099     ASFContext *asf = s->priv_data;
1100     int64_t current_pos= url_ftell(s->pb);
1101     int i;
1102
1103     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1104     get_guid(s->pb, &g);
1105     if (!guidcmp(&g, &index_guid)) {
1106         int64_t itime, last_pos=-1;
1107         int pct, ict;
1108         int64_t av_unused gsize= get_le64(s->pb);
1109         get_guid(s->pb, &g);
1110         itime=get_le64(s->pb);
1111         pct=get_le32(s->pb);
1112         ict=get_le32(s->pb);
1113         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1114
1115         for (i=0;i<ict;i++){
1116             int pktnum=get_le32(s->pb);
1117             int pktct =get_le16(s->pb);
1118             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1119             int64_t index_pts= av_rescale(itime, i, 10000);
1120
1121             if(pos != last_pos){
1122             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1123             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1124             last_pos=pos;
1125             }
1126         }
1127         asf->index_read= 1;
1128     }
1129     url_fseek(s->pb, current_pos, SEEK_SET);
1130 }
1131
1132 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1133 {
1134     ASFContext *asf = s->priv_data;
1135     AVStream *st = s->streams[stream_index];
1136     int64_t pos;
1137     int index;
1138
1139     if (s->packet_size <= 0)
1140         return -1;
1141
1142     /* Try using the protocol's read_seek if available */
1143     if(s->pb) {
1144         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1145         if(ret >= 0)
1146             asf_reset_header(s);
1147         if (ret != AVERROR(ENOSYS))
1148             return ret;
1149     }
1150
1151     if (!asf->index_read)
1152         asf_build_simple_index(s, stream_index);
1153
1154     if(!(asf->index_read && st->index_entries)){
1155         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1156             return -1;
1157     }else{
1158         index= av_index_search_timestamp(st, pts, flags);
1159         if(index<0)
1160             return -1;
1161
1162         /* find the position */
1163         pos = st->index_entries[index].pos;
1164
1165     // various attempts to find key frame have failed so far
1166     //    asf_reset_header(s);
1167     //    url_fseek(s->pb, pos, SEEK_SET);
1168     //    key_pos = pos;
1169     //     for(i=0;i<16;i++){
1170     //         pos = url_ftell(s->pb);
1171     //         if (av_read_frame(s, &pkt) < 0){
1172     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1173     //             return -1;
1174     //         }
1175     //         asf_st = s->streams[stream_index]->priv_data;
1176     //         pos += st->parser->frame_offset;
1177     //
1178     //         if (pkt.size > b) {
1179     //             b = pkt.size;
1180     //             key_pos = pos;
1181     //         }
1182     //
1183     //         av_free_packet(&pkt);
1184     //     }
1185
1186         /* do the seek */
1187         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1188         url_fseek(s->pb, pos, SEEK_SET);
1189     }
1190     asf_reset_header(s);
1191     return 0;
1192 }
1193
1194 AVInputFormat asf_demuxer = {
1195     "asf",
1196     NULL_IF_CONFIG_SMALL("ASF format"),
1197     sizeof(ASFContext),
1198     asf_probe,
1199     asf_read_header,
1200     asf_read_packet,
1201     asf_read_close,
1202     asf_read_seek,
1203     asf_read_pts,
1204     .metadata_conv = ff_asf_metadata_conv,
1205 };