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

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