git.sesse.net Git - ffmpeg/blob - libavformat/asf.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 #include "avformat.h"
  22 #include "riff.h"
  23 #include "mpegaudio.h"
  24 #include "asf.h"
  25 #include "common.h"
  26
  27 #undef NDEBUG
  28 #include <assert.h>
  29
  30 #define FRAME_HEADER_SIZE 17
  31 // Fix Me! FRAME_HEADER_SIZE may be different.
  32
  33 static const GUID index_guid = {
  34     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  35 };
  36
  37 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
  38     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  39 };
  40 /**********************************/
  41 /* decoding */
  42
  43 //#define DEBUG
  44
  45 #ifdef DEBUG
  46 #define PRINT_IF_GUID(g,cmp) \
  47 if (!memcmp(g, &cmp, sizeof(GUID))) \
  48     printf("(GUID: %s) ", #cmp)
  49
  50 static void print_guid(const GUID *g)
  51 {
  52     int i;
  53     PRINT_IF_GUID(g, asf_header);
  54     else PRINT_IF_GUID(g, file_header);
  55     else PRINT_IF_GUID(g, stream_header);
  56     else PRINT_IF_GUID(g, audio_stream);
  57     else PRINT_IF_GUID(g, audio_conceal_none);
  58     else PRINT_IF_GUID(g, video_stream);
  59     else PRINT_IF_GUID(g, video_conceal_none);
  60     else PRINT_IF_GUID(g, command_stream);
  61     else PRINT_IF_GUID(g, comment_header);
  62     else PRINT_IF_GUID(g, codec_comment_header);
  63     else PRINT_IF_GUID(g, codec_comment1_header);
  64     else PRINT_IF_GUID(g, data_header);
  65     else PRINT_IF_GUID(g, index_guid);
  66     else PRINT_IF_GUID(g, head1_guid);
  67     else PRINT_IF_GUID(g, head2_guid);
  68     else PRINT_IF_GUID(g, my_guid);
  69     else PRINT_IF_GUID(g, ext_stream_header);
  70     else PRINT_IF_GUID(g, extended_content_header);
  71     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  72     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  73     else PRINT_IF_GUID(g, metadata_header);
  74     else PRINT_IF_GUID(g, stream_bitrate_guid);
  75     else
  76         printf("(GUID: unknown) ");
  77     for(i=0;i<16;i++)
  78         printf(" 0x%02x,", (*g)[i]);
  79     printf("}\n");
  80 }
  81 #undef PRINT_IF_GUID
  82 #endif
  83
  84 static void get_guid(ByteIOContext *s, GUID *g)
  85 {
  86     assert(sizeof(*g) == 16);
  87     get_buffer(s, g, sizeof(*g));
  88 }
  89
  90 #if 0
  91 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  92 {
  93     int len, c;
  94     char *q;
  95
  96     len = get_le16(pb);
  97     q = buf;
  98     while (len > 0) {
  99         c = get_le16(pb);
 100         if ((q - buf) < buf_size - 1)
 101             *q++ = c;
 102         len--;
 103     }
 104     *q = '\0';
 105 }
 106 #endif
 107
 108 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 109 {
 110     char* q = buf;
 111     len /= 2;
 112     while (len--) {
 113         uint8_t tmp;
 114         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 115     }
 116     *q = '\0';
 117 }
 118
 119 static int asf_probe(AVProbeData *pd)
 120 {
 121     /* check file header */
 122     if (pd->buf_size <= 32)
 123         return 0;
 124
 125     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
 126         return AVPROBE_SCORE_MAX;
 127     else
 128         return 0;
 129 }
 130
 131 static int get_value(ByteIOContext *pb, int type){
 132     switch(type){
 133         case 2: return get_le32(pb);
 134         case 3: return get_le32(pb);
 135         case 4: return get_le64(pb);
 136         case 5: return get_le16(pb);
 137         default:return INT_MIN;
 138     }
 139 }
 140
 141 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 142 {
 143     ASFContext *asf = s->priv_data;
 144     GUID g;
 145     ByteIOContext *pb = &s->pb;
 146     AVStream *st;
 147     ASFStream *asf_st;
 148     int size, i;
 149     int64_t gsize;
 150     AVRational dar[128];
 151
 152     memset(dar, 0, sizeof(dar));
 153
 154     get_guid(pb, &g);
 155     if (memcmp(&g, &asf_header, sizeof(GUID)))
 156         goto fail;
 157     get_le64(pb);
 158     get_le32(pb);
 159     get_byte(pb);
 160     get_byte(pb);
 161     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 162     for(;;) {
 163         get_guid(pb, &g);
 164         gsize = get_le64(pb);
 165 #ifdef DEBUG
 166         printf("%08"PRIx64": ", url_ftell(pb) - 24);
 167         print_guid(&g);
 168         printf("  size=0x%"PRIx64"\n", gsize);
 169 #endif
 170         if (!memcmp(&g, &data_header, sizeof(GUID))) {
 171             asf->data_object_offset = url_ftell(pb);
 172             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 173             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 174                 asf->data_object_size = gsize - 24;
 175             } else {
 176                 asf->data_object_size = (uint64_t)-1;
 177             }
 178             break;
 179         }
 180         if (gsize < 24)
 181             goto fail;
 182         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 183             get_guid(pb, &asf->hdr.guid);
 184             asf->hdr.file_size          = get_le64(pb);
 185             asf->hdr.create_time        = get_le64(pb);
 186             asf->nb_packets             = get_le64(pb);
 187             asf->hdr.send_time          = get_le64(pb);
 188             asf->hdr.play_time          = get_le64(pb);
 189             asf->hdr.preroll            = get_le32(pb);
 190             asf->hdr.ignore             = get_le32(pb);
 191             asf->hdr.flags              = get_le32(pb);
 192             asf->hdr.min_pktsize        = get_le32(pb);
 193             asf->hdr.max_pktsize        = get_le32(pb);
 194             asf->hdr.max_bitrate        = get_le32(pb);
 195             asf->packet_size = asf->hdr.max_pktsize;
 196         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 197             int type, type_specific_size, sizeX;
 198             uint64_t total_size;
 199             unsigned int tag1;
 200             int64_t pos1, pos2;
 201             int test_for_ext_stream_audio;
 202
 203             pos1 = url_ftell(pb);
 204
 205             st = av_new_stream(s, 0);
 206             if (!st)
 207                 goto fail;
 208             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 209             asf_st = av_mallocz(sizeof(ASFStream));
 210             if (!asf_st)
 211                 goto fail;
 212             st->priv_data = asf_st;
 213             st->start_time = asf->hdr.preroll;
 214             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 215                 st->duration = asf->hdr.send_time /
 216                     (10000000 / 1000) - st->start_time;
 217             }
 218             get_guid(pb, &g);
 219
 220             test_for_ext_stream_audio = 0;
 221             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 222                 type = CODEC_TYPE_AUDIO;
 223             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 224                 type = CODEC_TYPE_VIDEO;
 225             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 226                 type = CODEC_TYPE_UNKNOWN;
 227             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 228                 test_for_ext_stream_audio = 1;
 229                 type = CODEC_TYPE_UNKNOWN;
 230             } else {
 231                 goto fail;
 232             }
 233             get_guid(pb, &g);
 234             total_size = get_le64(pb);
 235             type_specific_size = get_le32(pb);
 236             get_le32(pb);
 237             st->id = get_le16(pb) & 0x7f; /* stream id */
 238             // mapping of asf ID to AV stream ID;
 239             asf->asfid2avid[st->id] = s->nb_streams - 1;
 240
 241             get_le32(pb);
 242
 243             if (test_for_ext_stream_audio) {
 244                 get_guid(pb, &g);
 245                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 246                     type = CODEC_TYPE_AUDIO;
 247                     get_guid(pb, &g);
 248                     get_le32(pb);
 249                     get_le32(pb);
 250                     get_le32(pb);
 251                     get_guid(pb, &g);
 252                     get_le32(pb);
 253                 }
 254             }
 255
 256             st->codec->codec_type = type;
 257             if (type == CODEC_TYPE_AUDIO) {
 258                 get_wav_header(pb, st->codec, type_specific_size);
 259                 st->need_parsing = 1;
 260                 /* We have to init the frame size at some point .... */
 261                 pos2 = url_ftell(pb);
 262                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 263                     asf_st->ds_span = get_byte(pb);
 264                     asf_st->ds_packet_size = get_le16(pb);
 265                     asf_st->ds_chunk_size = get_le16(pb);
 266                     get_le16(pb); //ds_data_size
 267                     get_byte(pb); //ds_silence_data
 268                 }
 269                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 270                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 271                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 272                 if (asf_st->ds_span > 1) {
 273                     if (!asf_st->ds_chunk_size
 274                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 275                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 276                         asf_st->ds_span = 0; // disable descrambling
 277                 }
 278                 switch (st->codec->codec_id) {
 279                 case CODEC_ID_MP3:
 280                     st->codec->frame_size = MPA_FRAME_SIZE;
 281                     break;
 282                 case CODEC_ID_PCM_S16LE:
 283                 case CODEC_ID_PCM_S16BE:
 284                 case CODEC_ID_PCM_U16LE:
 285                 case CODEC_ID_PCM_U16BE:
 286                 case CODEC_ID_PCM_S8:
 287                 case CODEC_ID_PCM_U8:
 288                 case CODEC_ID_PCM_ALAW:
 289                 case CODEC_ID_PCM_MULAW:
 290                     st->codec->frame_size = 1;
 291                     break;
 292                 default:
 293                     /* This is probably wrong, but it prevents a crash later */
 294                     st->codec->frame_size = 1;
 295                     break;
 296                 }
 297             } else if (type == CODEC_TYPE_VIDEO) {
 298                 get_le32(pb);
 299                 get_le32(pb);
 300                 get_byte(pb);
 301                 size = get_le16(pb); /* size */
 302                 sizeX= get_le32(pb); /* size */
 303                 st->codec->width = get_le32(pb);
 304                 st->codec->height = get_le32(pb);
 305                 /* not available for asf */
 306                 get_le16(pb); /* panes */
 307                 st->codec->bits_per_sample = get_le16(pb); /* depth */
 308                 tag1 = get_le32(pb);
 309                 url_fskip(pb, 20);
 310 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 311                 size= sizeX;
 312                 if (size > 40) {
 313                     st->codec->extradata_size = size - 40;
 314                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 315                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 316                 }
 317
 318         /* Extract palette from extradata if bpp <= 8 */
 319         /* This code assumes that extradata contains only palette */
 320         /* This is true for all paletted codecs implemented in ffmpeg */
 321         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
 322             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 323 #ifdef WORDS_BIGENDIAN
 324             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 325                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 326 #else
 327             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 328                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 329 #endif
 330             st->codec->palctrl->palette_changed = 1;
 331         }
 332
 333                 st->codec->codec_tag = tag1;
 334                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 335                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 336                     st->need_parsing = 1;
 337             }
 338             pos2 = url_ftell(pb);
 339             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 340         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 341             int len1, len2, len3, len4, len5;
 342
 343             len1 = get_le16(pb);
 344             len2 = get_le16(pb);
 345             len3 = get_le16(pb);
 346             len4 = get_le16(pb);
 347             len5 = get_le16(pb);
 348             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
 349             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
 350             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 351             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
 352             url_fskip(pb, len5);
 353         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
 354             int stream_count = get_le16(pb);
 355             int j;
 356
 357 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
 358 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
 359             for(j = 0; j < stream_count; j++) {
 360                 int flags, bitrate, stream_id;
 361
 362                 flags= get_le16(pb);
 363                 bitrate= get_le32(pb);
 364                 stream_id= (flags & 0x7f);
 365 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 366                 asf->stream_bitrates[stream_id-1]= bitrate;
 367             }
 368        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 369                 int desc_count, i;
 370
 371                 desc_count = get_le16(pb);
 372                 for(i=0;i<desc_count;i++)
 373                 {
 374                         int name_len,value_type,value_len;
 375                         uint64_t value_num = 0;
 376                         char name[1024];
 377
 378                         name_len = get_le16(pb);
 379                         get_str16_nolen(pb, name_len, name, sizeof(name));
 380                         value_type = get_le16(pb);
 381                         value_len = get_le16(pb);
 382                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 383                         {
 384                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
 385                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
 386                                 else url_fskip(pb, value_len);
 387                         }
 388                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 389                         {
 390                                 value_num= get_value(pb, value_type);
 391                                 if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
 392                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
 393                         }
 394                 }
 395         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
 396             int n, stream_num, name_len, value_len, value_type, value_num;
 397             n = get_le16(pb);
 398
 399             for(i=0;i<n;i++) {
 400                 char name[1024];
 401
 402                 get_le16(pb); //lang_list_index
 403                 stream_num= get_le16(pb);
 404                 name_len=   get_le16(pb);
 405                 value_type= get_le16(pb);
 406                 value_len=  get_le32(pb);
 407
 408                 get_str16_nolen(pb, name_len, name, sizeof(name));
 409 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 410                 value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
 411                 url_fskip(pb, value_len - 2);
 412
 413                 if(stream_num<128){
 414                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 415                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 416                 }
 417             }
 418         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 419             int ext_len, payload_ext_ct, stream_ct;
 420             uint32_t ext_d;
 421             int64_t pos_ex_st;
 422             pos_ex_st = url_ftell(pb);
 423
 424             get_le64(pb); // starttime
 425             get_le64(pb); // endtime
 426             get_le32(pb); // leak-datarate
 427             get_le32(pb); // bucket-datasize
 428             get_le32(pb); // init-bucket-fullness
 429             get_le32(pb); // alt-leak-datarate
 430             get_le32(pb); // alt-bucket-datasize
 431             get_le32(pb); // alt-init-bucket-fullness
 432             get_le32(pb); // max-object-size
 433             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 434             get_le16(pb); // stream-num
 435             get_le16(pb); // stream-language-id-index
 436             get_le64(pb); // avg frametime in 100ns units
 437             stream_ct = get_le16(pb); //stream-name-count
 438             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 439
 440             for (i=0; i<stream_ct; i++){
 441                 get_le16(pb);
 442                 ext_len = get_le16(pb);
 443                 url_fseek(pb, ext_len, SEEK_CUR);
 444             }
 445
 446             for (i=0; i<payload_ext_ct; i++){
 447                 get_guid(pb, &g);
 448                 ext_d=get_le16(pb);
 449                 ext_len=get_le32(pb);
 450                 url_fseek(pb, ext_len, SEEK_CUR);
 451             }
 452
 453             // there could be a optional stream properties object to follow
 454             // if so the next iteration will pick it up
 455         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 456             int v1, v2;
 457             get_guid(pb, &g);
 458             v1 = get_le32(pb);
 459             v2 = get_le16(pb);
 460 #if 0
 461         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 462             int len, v1, n, num;
 463             char str[256], *q;
 464             char tag[16];
 465
 466             get_guid(pb, &g);
 467             print_guid(&g);
 468
 469             n = get_le32(pb);
 470             for(i=0;i<n;i++) {
 471                 num = get_le16(pb); /* stream number */
 472                 get_str16(pb, str, sizeof(str));
 473                 get_str16(pb, str, sizeof(str));
 474                 len = get_le16(pb);
 475                 q = tag;
 476                 while (len > 0) {
 477                     v1 = get_byte(pb);
 478                     if ((q - tag) < sizeof(tag) - 1)
 479                         *q++ = v1;
 480                     len--;
 481                 }
 482                 *q = '\0';
 483             }
 484 #endif
 485         } else if (url_feof(pb)) {
 486             goto fail;
 487         } else {
 488             url_fseek(pb, gsize - 24, SEEK_CUR);
 489         }
 490     }
 491     get_guid(pb, &g);
 492     get_le64(pb);
 493     get_byte(pb);
 494     get_byte(pb);
 495     if (url_feof(pb))
 496         goto fail;
 497     asf->data_offset = url_ftell(pb);
 498     asf->packet_size_left = 0;
 499
 500
 501     for(i=0; i<128; i++){
 502         int stream_num= asf->asfid2avid[i];
 503         if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){
 504             AVCodecContext *codec= s->streams[stream_num]->codec;
 505             av_reduce(&codec->sample_aspect_ratio.num,
 506                     &codec->sample_aspect_ratio.den,
 507                     dar[i].num, dar[i].den, INT_MAX);
 508 //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
 509         }
 510     }
 511
 512     return 0;
 513
 514  fail:
 515      for(i=0;i<s->nb_streams;i++) {
 516         AVStream *st = s->streams[i];
 517         if (st) {
 518             av_free(st->priv_data);
 519             av_free(st->codec->extradata);
 520         }
 521         av_free(st);
 522     }
 523     return -1;
 524 }
 525
 526 #define DO_2BITS(bits, var, defval) \
 527     switch (bits & 3) \
 528     { \
 529     case 3: var = get_le32(pb); rsize += 4; break; \
 530     case 2: var = get_le16(pb); rsize += 2; break; \
 531     case 1: var = get_byte(pb); rsize++; break; \
 532     default: var = defval; break; \
 533     }
 534
 535 /**
 536  *
 537  * @return <0 in case of an error
 538  */
 539 static int asf_get_packet(AVFormatContext *s)
 540 {
 541     ASFContext *asf = s->priv_data;
 542     ByteIOContext *pb = &s->pb;
 543     uint32_t packet_length, padsize;
 544     int rsize = 8;
 545     int c, d, e, off;
 546
 547     off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
 548
 549     c=d=e=-1;
 550     while(off-- > 0){
 551         c=d; d=e;
 552         e= get_byte(pb);
 553         if(c == 0x82 && !d && !e)
 554             break;
 555     }
 556
 557     if (c != 0x82) {
 558         if (!url_feof(pb))
 559             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 560     }
 561     if ((c & 0x8f) == 0x82) {
 562         if (d || e) {
 563             if (!url_feof(pb))
 564                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 565             return -1;
 566         }
 567         c= get_byte(pb);
 568         d= get_byte(pb);
 569         rsize+=3;
 570     }else{
 571         url_fseek(pb, -1, SEEK_CUR); //FIXME
 572     }
 573
 574     asf->packet_flags    = c;
 575     asf->packet_property = d;
 576
 577     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 578     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 579     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 580
 581     //the following checks prevent overflows and infinite loops
 582     if(packet_length >= (1U<<29)){
 583         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 584         return -1;
 585     }
 586     if(padsize >= packet_length){
 587         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 588         return -1;
 589     }
 590
 591     asf->packet_timestamp = get_le32(pb);
 592     get_le16(pb); /* duration */
 593     // rsize has at least 11 bytes which have to be present
 594
 595     if (asf->packet_flags & 0x01) {
 596         asf->packet_segsizetype = get_byte(pb); rsize++;
 597         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 598     } else {
 599         asf->packet_segments = 1;
 600         asf->packet_segsizetype = 0x80;
 601     }
 602     asf->packet_size_left = packet_length - padsize - rsize;
 603     if (packet_length < asf->hdr.min_pktsize)
 604         padsize += asf->hdr.min_pktsize - packet_length;
 605     asf->packet_padsize = padsize;
 606 #ifdef DEBUG
 607     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 608 #endif
 609     return 0;
 610 }
 611
 612 /**
 613  *
 614  * @return <0 if error
 615  */
 616 static int asf_read_frame_header(AVFormatContext *s){
 617     ASFContext *asf = s->priv_data;
 618     ByteIOContext *pb = &s->pb;
 619     int rsize = 1;
 620     int num = get_byte(pb);
 621     int64_t ts0, ts1;
 622
 623     asf->packet_segments--;
 624     asf->packet_key_frame = num >> 7;
 625     asf->stream_index = asf->asfid2avid[num & 0x7f];
 626     // sequence should be ignored!
 627     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 628     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 629     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 630 //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);
 631     if (asf->packet_replic_size >= 8) {
 632         asf->packet_obj_size = get_le32(pb);
 633         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 634             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 635             return -1;
 636         }
 637         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 638         if(asf->packet_replic_size >= 8+38+4){
 639 //            for(i=0; i<asf->packet_replic_size-8; i++)
 640 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 641 //            av_log(s, AV_LOG_DEBUG, "\n");
 642             url_fskip(pb, 10);
 643             ts0= get_le64(pb);
 644             ts1= get_le64(pb);
 645             url_fskip(pb, 12);
 646             get_le32(pb);
 647             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 648             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 649             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 650         }else
 651             url_fskip(pb, asf->packet_replic_size - 8);
 652         rsize += asf->packet_replic_size; // FIXME - check validity
 653     } else if (asf->packet_replic_size==1){
 654         // multipacket - frag_offset is begining timestamp
 655         asf->packet_time_start = asf->packet_frag_offset;
 656         asf->packet_frag_offset = 0;
 657         asf->packet_frag_timestamp = asf->packet_timestamp;
 658
 659         asf->packet_time_delta = get_byte(pb);
 660         rsize++;
 661     }else if(asf->packet_replic_size!=0){
 662         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 663         return -1;
 664     }
 665     if (asf->packet_flags & 0x01) {
 666         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 667         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 668             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 669             return -1;
 670         }
 671         //printf("Fragsize %d\n", asf->packet_frag_size);
 672     } else {
 673         asf->packet_frag_size = asf->packet_size_left - rsize;
 674         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 675     }
 676     if (asf->packet_replic_size == 1) {
 677         asf->packet_multi_size = asf->packet_frag_size;
 678         if (asf->packet_multi_size > asf->packet_size_left)
 679             return -1;
 680     }
 681     asf->packet_size_left -= rsize;
 682     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 683
 684     return 0;
 685 }
 686
 687 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 688 {
 689     ASFContext *asf = s->priv_data;
 690     ASFStream *asf_st = 0;
 691     ByteIOContext *pb = &s->pb;
 692     //static int pc = 0;
 693     for (;;) {
 694         if(url_feof(pb))
 695             return AVERROR_IO;
 696         if (asf->packet_size_left < FRAME_HEADER_SIZE
 697             || asf->packet_segments < 1) {
 698             //asf->packet_size_left <= asf->packet_padsize) {
 699             int ret = asf->packet_size_left + asf->packet_padsize;
 700             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 701             assert(ret>=0);
 702             /* fail safe */
 703             url_fskip(pb, ret);
 704
 705             asf->packet_pos= url_ftell(&s->pb);
 706             if (asf->data_object_size != (uint64_t)-1 &&
 707                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 708                 return AVERROR_IO; /* Do not exceed the size of the data object */
 709             ret = asf_get_packet(s);
 710             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 711             if (ret < 0)
 712                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 713             asf->packet_time_start = 0;
 714             continue;
 715         }
 716         if (asf->packet_time_start == 0) {
 717             if(asf_read_frame_header(s) < 0){
 718                 asf->packet_segments= 0;
 719                 continue;
 720             }
 721             if (asf->stream_index < 0
 722                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 723                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 724                 ) {
 725                 asf->packet_time_start = 0;
 726                 /* unhandled packet (should not happen) */
 727                 url_fskip(pb, asf->packet_frag_size);
 728                 asf->packet_size_left -= asf->packet_frag_size;
 729                 if(asf->stream_index < 0)
 730                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 731                 continue;
 732             }
 733             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 734         }
 735         asf_st = asf->asf_st;
 736
 737         if (asf->packet_replic_size == 1) {
 738             // frag_offset is here used as the begining timestamp
 739             asf->packet_frag_timestamp = asf->packet_time_start;
 740             asf->packet_time_start += asf->packet_time_delta;
 741             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 742             asf->packet_size_left--;
 743             asf->packet_multi_size--;
 744             if (asf->packet_multi_size < asf->packet_obj_size)
 745             {
 746                 asf->packet_time_start = 0;
 747                 url_fskip(pb, asf->packet_multi_size);
 748                 asf->packet_size_left -= asf->packet_multi_size;
 749                 continue;
 750             }
 751             asf->packet_multi_size -= asf->packet_obj_size;
 752             //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);
 753         }
 754         if (   asf_st->pkt.size != asf->packet_obj_size
 755             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 756             if(asf_st->pkt.data){
 757                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 758                 asf_st->frag_offset = 0;
 759                 av_free_packet(&asf_st->pkt);
 760             }
 761             /* new packet */
 762             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 763             asf_st->seq = asf->packet_seq;
 764             asf_st->pkt.pts = asf->packet_frag_timestamp;
 765             asf_st->pkt.stream_index = asf->stream_index;
 766             asf_st->pkt.pos =
 767             asf_st->packet_pos= asf->packet_pos;
 768 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 769 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 770 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 771             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 772                 asf->packet_key_frame = 1;
 773             if (asf->packet_key_frame)
 774                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 775         }
 776
 777         /* read data */
 778         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 779         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 780         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 781         asf->packet_size_left -= asf->packet_frag_size;
 782         if (asf->packet_size_left < 0)
 783             continue;
 784
 785         if(   asf->packet_frag_offset >= asf_st->pkt.size
 786            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 787             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 788                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 789             continue;
 790         }
 791
 792         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 793                    asf->packet_frag_size);
 794         asf_st->frag_offset += asf->packet_frag_size;
 795         /* test if whole packet is read */
 796         if (asf_st->frag_offset == asf_st->pkt.size) {
 797             /* return packet */
 798             if (asf_st->ds_span > 1) {
 799               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 800                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
 801               }else{
 802                 /* packet descrambling */
 803                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 804                 if (newdata) {
 805                     int offset = 0;
 806                     while (offset < asf_st->pkt.size) {
 807                         int off = offset / asf_st->ds_chunk_size;
 808                         int row = off / asf_st->ds_span;
 809                         int col = off % asf_st->ds_span;
 810                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 811                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 812
 813                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 814                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 815                         memcpy(newdata + offset,
 816                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 817                                asf_st->ds_chunk_size);
 818                         offset += asf_st->ds_chunk_size;
 819                     }
 820                     av_free(asf_st->pkt.data);
 821                     asf_st->pkt.data = newdata;
 822                 }
 823               }
 824             }
 825             asf_st->frag_offset = 0;
 826             *pkt= asf_st->pkt;
 827             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 828             asf_st->pkt.size = 0;
 829             asf_st->pkt.data = 0;
 830             break; // packet completed
 831         }
 832     }
 833     return 0;
 834 }
 835
 836 static int asf_read_close(AVFormatContext *s)
 837 {
 838     int i;
 839
 840     for(i=0;i<s->nb_streams;i++) {
 841         AVStream *st = s->streams[i];
 842         av_free(st->priv_data);
 843         av_free(st->codec->palctrl);
 844     }
 845     return 0;
 846 }
 847
 848 // Added to support seeking after packets have been read
 849 // If information is not reset, read_packet fails due to
 850 // leftover information from previous reads
 851 static void asf_reset_header(AVFormatContext *s)
 852 {
 853     ASFContext *asf = s->priv_data;
 854     ASFStream *asf_st;
 855     int i;
 856
 857     asf->packet_nb_frames = 0;
 858     asf->packet_size_left = 0;
 859     asf->packet_segments = 0;
 860     asf->packet_flags = 0;
 861     asf->packet_property = 0;
 862     asf->packet_timestamp = 0;
 863     asf->packet_segsizetype = 0;
 864     asf->packet_segments = 0;
 865     asf->packet_seq = 0;
 866     asf->packet_replic_size = 0;
 867     asf->packet_key_frame = 0;
 868     asf->packet_padsize = 0;
 869     asf->packet_frag_offset = 0;
 870     asf->packet_frag_size = 0;
 871     asf->packet_frag_timestamp = 0;
 872     asf->packet_multi_size = 0;
 873     asf->packet_obj_size = 0;
 874     asf->packet_time_delta = 0;
 875     asf->packet_time_start = 0;
 876
 877     for(i=0; i<s->nb_streams; i++){
 878         asf_st= s->streams[i]->priv_data;
 879         av_free_packet(&asf_st->pkt);
 880         asf_st->frag_offset=0;
 881         asf_st->seq=0;
 882     }
 883     asf->asf_st= NULL;
 884 }
 885
 886 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 887 {
 888     ASFContext *asf = s->priv_data;
 889     AVPacket pkt1, *pkt = &pkt1;
 890     ASFStream *asf_st;
 891     int64_t pts;
 892     int64_t pos= *ppos;
 893     int i;
 894     int64_t start_pos[s->nb_streams];
 895
 896     for(i=0; i<s->nb_streams; i++){
 897         start_pos[i]= pos;
 898     }
 899
 900     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 901     *ppos= pos;
 902     url_fseek(&s->pb, pos, SEEK_SET);
 903
 904 //printf("asf_read_pts\n");
 905     asf_reset_header(s);
 906     for(;;){
 907         if (av_read_frame(s, pkt) < 0){
 908             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 909             return AV_NOPTS_VALUE;
 910         }
 911
 912         pts= pkt->pts;
 913
 914         av_free_packet(pkt);
 915         if(pkt->flags&PKT_FLAG_KEY){
 916             i= pkt->stream_index;
 917
 918             asf_st= s->streams[i]->priv_data;
 919
 920 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 921             pos= asf_st->packet_pos;
 922
 923             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 924             start_pos[i]= asf_st->packet_pos + 1;
 925
 926             if(pkt->stream_index == stream_index)
 927                break;
 928         }
 929     }
 930
 931     *ppos= pos;
 932 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 933
 934     return pts;
 935 }
 936
 937 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 938 {
 939     GUID g;
 940     ASFContext *asf = s->priv_data;
 941     int64_t gsize, itime;
 942     int64_t pos, current_pos, index_pts;
 943     int i;
 944     int pct,ict;
 945
 946     current_pos = url_ftell(&s->pb);
 947
 948     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 949     get_guid(&s->pb, &g);
 950     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 951         gsize = get_le64(&s->pb);
 952         get_guid(&s->pb, &g);
 953         itime=get_le64(&s->pb);
 954         pct=get_le32(&s->pb);
 955         ict=get_le32(&s->pb);
 956         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
 957
 958         for (i=0;i<ict;i++){
 959             int pktnum=get_le32(&s->pb);
 960             int pktct =get_le16(&s->pb);
 961             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
 962
 963             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
 964             index_pts=av_rescale(itime, i, 10000);
 965
 966             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
 967         }
 968         asf->index_read= 1;
 969     }
 970     url_fseek(&s->pb, current_pos, SEEK_SET);
 971 }
 972
 973 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 974 {
 975     ASFContext *asf = s->priv_data;
 976     AVStream *st = s->streams[stream_index];
 977     int64_t pos;
 978     int index;
 979
 980     if (asf->packet_size <= 0)
 981         return -1;
 982
 983     if (!asf->index_read)
 984         asf_build_simple_index(s, stream_index);
 985
 986     if(!(asf->index_read && st->index_entries)){
 987         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
 988             return -1;
 989     }else{
 990         index= av_index_search_timestamp(st, pts, flags);
 991         if(index<0)
 992             return -1;
 993
 994         /* find the position */
 995         pos = st->index_entries[index].pos;
 996         pts = st->index_entries[index].timestamp;
 997
 998     // various attempts to find key frame have failed so far
 999     //    asf_reset_header(s);
1000     //    url_fseek(&s->pb, pos, SEEK_SET);
1001     //    key_pos = pos;
1002     //     for(i=0;i<16;i++){
1003     //         pos = url_ftell(&s->pb);
1004     //         if (av_read_frame(s, &pkt) < 0){
1005     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1006     //             return -1;
1007     //         }
1008     //         asf_st = s->streams[stream_index]->priv_data;
1009     //         pos += st->parser->frame_offset;
1010     //
1011     //         if (pkt.size > b) {
1012     //             b = pkt.size;
1013     //             key_pos = pos;
1014     //         }
1015     //
1016     //         av_free_packet(&pkt);
1017     //     }
1018
1019         /* do the seek */
1020         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1021         url_fseek(&s->pb, pos, SEEK_SET);
1022     }
1023     asf_reset_header(s);
1024     return 0;
1025 }
1026
1027 AVInputFormat asf_demuxer = {
1028     "asf",
1029     "asf format",
1030     sizeof(ASFContext),
1031     asf_probe,
1032     asf_read_header,
1033     asf_read_packet,
1034     asf_read_close,
1035     asf_read_seek,
1036     asf_read_pts,
1037 };