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

   1 /*
   2  * ASF compatible decoder.
   3  * Copyright (c) 2000, 2001 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19 #include "avformat.h"
  20 #include "avi.h"
  21 #include "mpegaudio.h"
  22 #include "asf.h"
  23
  24 #undef NDEBUG
  25 #include <assert.h>
  26
  27 #define FRAME_HEADER_SIZE 17
  28 // Fix Me! FRAME_HEADER_SIZE may be different.
  29
  30 static const GUID index_guid = {
  31     0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
  32 };
  33
  34 /**********************************/
  35 /* decoding */
  36
  37 //#define DEBUG
  38
  39 #ifdef DEBUG
  40 #define PRINT_IF_GUID(g,cmp) \
  41 if (!memcmp(g, &cmp, sizeof(GUID))) \
  42     printf("(GUID: %s) ", #cmp)
  43
  44 static void print_guid(const GUID *g)
  45 {
  46     int i;
  47     PRINT_IF_GUID(g, asf_header);
  48     else PRINT_IF_GUID(g, file_header);
  49     else PRINT_IF_GUID(g, stream_header);
  50     else PRINT_IF_GUID(g, audio_stream);
  51     else PRINT_IF_GUID(g, audio_conceal_none);
  52     else PRINT_IF_GUID(g, video_stream);
  53     else PRINT_IF_GUID(g, video_conceal_none);
  54     else PRINT_IF_GUID(g, command_stream);
  55     else PRINT_IF_GUID(g, comment_header);
  56     else PRINT_IF_GUID(g, codec_comment_header);
  57     else PRINT_IF_GUID(g, codec_comment1_header);
  58     else PRINT_IF_GUID(g, data_header);
  59     else PRINT_IF_GUID(g, index_guid);
  60     else PRINT_IF_GUID(g, head1_guid);
  61     else PRINT_IF_GUID(g, head2_guid);
  62     else PRINT_IF_GUID(g, my_guid);
  63     else PRINT_IF_GUID(g, ext_stream_header);
  64     else PRINT_IF_GUID(g, extended_content_header);
  65     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  66     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  67     else
  68         printf("(GUID: unknown) ");
  69     printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
  70     for(i=0;i<8;i++)
  71         printf(" 0x%02x,", g->v4[i]);
  72     printf("}\n");
  73 }
  74 #undef PRINT_IF_GUID
  75 #endif
  76
  77 static void get_guid(ByteIOContext *s, GUID *g)
  78 {
  79     int i;
  80
  81     g->v1 = get_le32(s);
  82     g->v2 = get_le16(s);
  83     g->v3 = get_le16(s);
  84     for(i=0;i<8;i++)
  85         g->v4[i] = get_byte(s);
  86 }
  87
  88 #if 0
  89 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  90 {
  91     int len, c;
  92     char *q;
  93
  94     len = get_le16(pb);
  95     q = buf;
  96     while (len > 0) {
  97         c = get_le16(pb);
  98         if ((q - buf) < buf_size - 1)
  99             *q++ = c;
 100         len--;
 101     }
 102     *q = '\0';
 103 }
 104 #endif
 105
 106 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 107 {
 108     int c;
 109     char *q;
 110
 111     q = buf;
 112     while (len > 0) {
 113         c = get_le16(pb);
 114         if ((q - buf) < buf_size - 1)
 115             *q++ = c;
 116         len-=2;
 117     }
 118     *q = '\0';
 119 }
 120
 121 static int asf_probe(AVProbeData *pd)
 122 {
 123     GUID g;
 124     const unsigned char *p;
 125     int i;
 126
 127     /* check file header */
 128     if (pd->buf_size <= 32)
 129         return 0;
 130     p = pd->buf;
 131     g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
 132     p += 4;
 133     g.v2 = p[0] | (p[1] << 8);
 134     p += 2;
 135     g.v3 = p[0] | (p[1] << 8);
 136     p += 2;
 137     for(i=0;i<8;i++)
 138         g.v4[i] = *p++;
 139
 140     if (!memcmp(&g, &asf_header, sizeof(GUID)))
 141         return AVPROBE_SCORE_MAX;
 142     else
 143         return 0;
 144 }
 145
 146 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 147 {
 148     ASFContext *asf = s->priv_data;
 149     GUID g;
 150     ByteIOContext *pb = &s->pb;
 151     AVStream *st;
 152     ASFStream *asf_st;
 153     int size, i;
 154     int64_t gsize;
 155
 156     get_guid(pb, &g);
 157     if (memcmp(&g, &asf_header, sizeof(GUID)))
 158         goto fail;
 159     get_le64(pb);
 160     get_le32(pb);
 161     get_byte(pb);
 162     get_byte(pb);
 163     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 164     for(;;) {
 165         get_guid(pb, &g);
 166         gsize = get_le64(pb);
 167 #ifdef DEBUG
 168         printf("%08Lx: ", url_ftell(pb) - 24);
 169         print_guid(&g);
 170         printf("  size=0x%Lx\n", gsize);
 171 #endif
 172         if (gsize < 24)
 173             goto fail;
 174         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 175             get_guid(pb, &asf->hdr.guid);
 176             asf->hdr.file_size          = get_le64(pb);
 177             asf->hdr.create_time        = get_le64(pb);
 178             asf->hdr.packets_count      = get_le64(pb);
 179             asf->hdr.send_time          = get_le64(pb);
 180             asf->hdr.play_time          = get_le64(pb);
 181             asf->hdr.preroll            = get_le32(pb);
 182             asf->hdr.ignore             = get_le32(pb);
 183             asf->hdr.flags              = get_le32(pb);
 184             asf->hdr.min_pktsize        = get_le32(pb);
 185             asf->hdr.max_pktsize        = get_le32(pb);
 186             asf->hdr.max_bitrate        = get_le32(pb);
 187             asf->packet_size = asf->hdr.max_pktsize;
 188             asf->nb_packets = asf->hdr.packets_count;
 189         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 190             int type, total_size, type_specific_size, sizeX;
 191             unsigned int tag1;
 192             int64_t pos1, pos2;
 193             int test_for_ext_stream_audio;
 194
 195             pos1 = url_ftell(pb);
 196
 197             st = av_new_stream(s, 0);
 198             if (!st)
 199                 goto fail;
 200             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 201             asf_st = av_mallocz(sizeof(ASFStream));
 202             if (!asf_st)
 203                 goto fail;
 204             st->priv_data = asf_st;
 205             st->start_time = asf->hdr.preroll;
 206             st->duration = asf->hdr.send_time /
 207                 (10000000 / 1000) - st->start_time;
 208             get_guid(pb, &g);
 209
 210             test_for_ext_stream_audio = 0;
 211             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 212                 type = CODEC_TYPE_AUDIO;
 213             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 214                 type = CODEC_TYPE_VIDEO;
 215             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 216                 type = CODEC_TYPE_UNKNOWN;
 217             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 218                 test_for_ext_stream_audio = 1;
 219                 type = CODEC_TYPE_UNKNOWN;
 220             } else {
 221                 goto fail;
 222             }
 223             get_guid(pb, &g);
 224             total_size = get_le64(pb);
 225             type_specific_size = get_le32(pb);
 226             get_le32(pb);
 227             st->id = get_le16(pb) & 0x7f; /* stream id */
 228             // mapping of asf ID to AV stream ID;
 229             asf->asfid2avid[st->id] = s->nb_streams - 1;
 230
 231             get_le32(pb);
 232
 233             if (test_for_ext_stream_audio) {
 234                 get_guid(pb, &g);
 235                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 236                     type = CODEC_TYPE_AUDIO;
 237                     get_guid(pb, &g);
 238                     get_le32(pb);
 239                     get_le32(pb);
 240                     get_le32(pb);
 241                     get_guid(pb, &g);
 242                     get_le32(pb);
 243                 }
 244             }
 245
 246             st->codec->codec_type = type;
 247             if (type == CODEC_TYPE_AUDIO) {
 248                 get_wav_header(pb, st->codec, type_specific_size);
 249                 st->need_parsing = 1;
 250                 /* We have to init the frame size at some point .... */
 251                 pos2 = url_ftell(pb);
 252                 if (gsize > (pos2 + 8 - pos1 + 24)) {
 253                     asf_st->ds_span = get_byte(pb);
 254                     asf_st->ds_packet_size = get_le16(pb);
 255                     asf_st->ds_chunk_size = get_le16(pb);
 256                     asf_st->ds_data_size = get_le16(pb);
 257                     asf_st->ds_silence_data = get_byte(pb);
 258                 }
 259                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 260                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 261                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 262                 if (asf_st->ds_span > 1) {
 263                     if (!asf_st->ds_chunk_size
 264                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
 265                         asf_st->ds_span = 0; // disable descrambling
 266                 }
 267                 switch (st->codec->codec_id) {
 268                 case CODEC_ID_MP3:
 269                     st->codec->frame_size = MPA_FRAME_SIZE;
 270                     break;
 271                 case CODEC_ID_PCM_S16LE:
 272                 case CODEC_ID_PCM_S16BE:
 273                 case CODEC_ID_PCM_U16LE:
 274                 case CODEC_ID_PCM_U16BE:
 275                 case CODEC_ID_PCM_S8:
 276                 case CODEC_ID_PCM_U8:
 277                 case CODEC_ID_PCM_ALAW:
 278                 case CODEC_ID_PCM_MULAW:
 279                     st->codec->frame_size = 1;
 280                     break;
 281                 default:
 282                     /* This is probably wrong, but it prevents a crash later */
 283                     st->codec->frame_size = 1;
 284                     break;
 285                 }
 286             } else if (type == CODEC_TYPE_VIDEO) {
 287                 get_le32(pb);
 288                 get_le32(pb);
 289                 get_byte(pb);
 290                 size = get_le16(pb); /* size */
 291                 sizeX= get_le32(pb); /* size */
 292                 st->codec->width = get_le32(pb);
 293                 st->codec->height = get_le32(pb);
 294                 /* not available for asf */
 295                 get_le16(pb); /* panes */
 296                 st->codec->bits_per_sample = get_le16(pb); /* depth */
 297                 tag1 = get_le32(pb);
 298                 url_fskip(pb, 20);
 299 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 300                 size= sizeX;
 301                 if (size > 40) {
 302                     st->codec->extradata_size = size - 40;
 303                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 304                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 305                 }
 306
 307         /* Extract palette from extradata if bpp <= 8 */
 308         /* This code assumes that extradata contains only palette */
 309         /* This is true for all paletted codecs implemented in ffmpeg */
 310         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
 311             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 312 #ifdef WORDS_BIGENDIAN
 313             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 314                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 315 #else
 316             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 317                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 318 #endif
 319             st->codec->palctrl->palette_changed = 1;
 320         }
 321
 322                 st->codec->codec_tag = tag1;
 323                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 324                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 325                     st->need_parsing = 1;
 326             }
 327             pos2 = url_ftell(pb);
 328             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 329         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
 330             break;
 331         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 332             int len1, len2, len3, len4, len5;
 333
 334             len1 = get_le16(pb);
 335             len2 = get_le16(pb);
 336             len3 = get_le16(pb);
 337             len4 = get_le16(pb);
 338             len5 = get_le16(pb);
 339             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
 340             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
 341             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 342             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
 343             url_fskip(pb, len5);
 344        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 345                 int desc_count, i;
 346
 347                 desc_count = get_le16(pb);
 348                 for(i=0;i<desc_count;i++)
 349                 {
 350                         int name_len,value_type,value_len,value_num = 0;
 351                         char *name, *value;
 352
 353                         name_len = get_le16(pb);
 354                         name = (char *)av_mallocz(name_len);
 355                         get_str16_nolen(pb, name_len, name, name_len);
 356                         value_type = get_le16(pb);
 357                         value_len = get_le16(pb);
 358                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 359                         {
 360                                 value = (char *)av_mallocz(value_len);
 361                                 get_str16_nolen(pb, value_len, value, value_len);
 362                                 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
 363                                 av_free(value);
 364                         }
 365                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 366                         {
 367                                 if (value_type==2) value_num = get_le32(pb);
 368                                 if (value_type==3) value_num = get_le32(pb);
 369                                 if (value_type==4) value_num = get_le64(pb);
 370                                 if (value_type==5) value_num = get_le16(pb);
 371                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
 372                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
 373                         }
 374                         av_free(name);
 375                 }
 376         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 377             int ext_len, payload_ext_ct, stream_ct;
 378             uint32_t ext_d;
 379             int64_t pos_ex_st;
 380             pos_ex_st = url_ftell(pb);
 381
 382             get_le64(pb);
 383             get_le64(pb);
 384             get_le32(pb);
 385             get_le32(pb);
 386             get_le32(pb);
 387             get_le32(pb);
 388             get_le32(pb);
 389             get_le32(pb);
 390             get_le32(pb);
 391             get_le32(pb);
 392             get_le16(pb);
 393             get_le16(pb);
 394             get_le64(pb);
 395             stream_ct = get_le16(pb);
 396             payload_ext_ct = get_le16(pb);
 397
 398             for (i=0; i<stream_ct; i++){
 399                 get_le16(pb);
 400                 ext_len = get_le16(pb);
 401                 url_fseek(pb, ext_len, SEEK_CUR);
 402             }
 403
 404             for (i=0; i<payload_ext_ct; i++){
 405                 get_guid(pb, &g);
 406                 ext_d=get_le16(pb);
 407                 ext_len=get_le32(pb);
 408                 url_fseek(pb, ext_len, SEEK_CUR);
 409             }
 410
 411             // there could be a optional stream properties object to follow
 412             // if so the next iteration will pick it up
 413         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 414             int v1, v2;
 415             get_guid(pb, &g);
 416             v1 = get_le32(pb);
 417             v2 = get_le16(pb);
 418 #if 0
 419         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 420             int len, v1, n, num;
 421             char str[256], *q;
 422             char tag[16];
 423
 424             get_guid(pb, &g);
 425             print_guid(&g);
 426
 427             n = get_le32(pb);
 428             for(i=0;i<n;i++) {
 429                 num = get_le16(pb); /* stream number */
 430                 get_str16(pb, str, sizeof(str));
 431                 get_str16(pb, str, sizeof(str));
 432                 len = get_le16(pb);
 433                 q = tag;
 434                 while (len > 0) {
 435                     v1 = get_byte(pb);
 436                     if ((q - tag) < sizeof(tag) - 1)
 437                         *q++ = v1;
 438                     len--;
 439                 }
 440                 *q = '\0';
 441             }
 442 #endif
 443         } else if (url_feof(pb)) {
 444             goto fail;
 445         } else {
 446             url_fseek(pb, gsize - 24, SEEK_CUR);
 447         }
 448     }
 449     get_guid(pb, &g);
 450     get_le64(pb);
 451     get_byte(pb);
 452     get_byte(pb);
 453     if (url_feof(pb))
 454         goto fail;
 455     asf->data_offset = url_ftell(pb);
 456     asf->packet_size_left = 0;
 457
 458     return 0;
 459
 460  fail:
 461      for(i=0;i<s->nb_streams;i++) {
 462         AVStream *st = s->streams[i];
 463         if (st) {
 464             av_free(st->priv_data);
 465             av_free(st->codec->extradata);
 466         }
 467         av_free(st);
 468     }
 469     return -1;
 470 }
 471
 472 #define DO_2BITS(bits, var, defval) \
 473     switch (bits & 3) \
 474     { \
 475     case 3: var = get_le32(pb); rsize += 4; break; \
 476     case 2: var = get_le16(pb); rsize += 2; break; \
 477     case 1: var = get_byte(pb); rsize++; break; \
 478     default: var = defval; break; \
 479     }
 480
 481 static int asf_get_packet(AVFormatContext *s)
 482 {
 483     ASFContext *asf = s->priv_data;
 484     ByteIOContext *pb = &s->pb;
 485     uint32_t packet_length, padsize;
 486     int rsize = 9;
 487     int c;
 488
 489     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
 490
 491     c = get_byte(pb);
 492     if (c != 0x82) {
 493         if (!url_feof(pb))
 494             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 495     }
 496     if ((c & 0x0f) == 2) { // always true for now
 497         if (get_le16(pb) != 0) {
 498             if (!url_feof(pb))
 499                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 500             return AVERROR_IO;
 501         }
 502         rsize+=2;
 503 /*    }else{
 504         if (!url_feof(pb))
 505             printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
 506         return AVERROR_IO;*/
 507     }
 508
 509     asf->packet_flags = get_byte(pb);
 510     asf->packet_property = get_byte(pb);
 511
 512     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 513     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 514     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 515
 516     asf->packet_timestamp = get_le32(pb);
 517     get_le16(pb); /* duration */
 518     // rsize has at least 11 bytes which have to be present
 519
 520     if (asf->packet_flags & 0x01) {
 521         asf->packet_segsizetype = get_byte(pb); rsize++;
 522         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 523     } else {
 524         asf->packet_segments = 1;
 525         asf->packet_segsizetype = 0x80;
 526     }
 527     asf->packet_size_left = packet_length - padsize - rsize;
 528     if (packet_length < asf->hdr.min_pktsize)
 529         padsize += asf->hdr.min_pktsize - packet_length;
 530     asf->packet_padsize = padsize;
 531 #ifdef DEBUG
 532     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 533 #endif
 534     return 0;
 535 }
 536
 537 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 538 {
 539     ASFContext *asf = s->priv_data;
 540     ASFStream *asf_st = 0;
 541     ByteIOContext *pb = &s->pb;
 542     //static int pc = 0;
 543     for (;;) {
 544         int rsize = 0;
 545         if (asf->packet_size_left < FRAME_HEADER_SIZE
 546             || asf->packet_segments < 1) {
 547             //asf->packet_size_left <= asf->packet_padsize) {
 548             int ret = asf->packet_size_left + asf->packet_padsize;
 549             //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 550             if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
 551                 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
 552             /* fail safe */
 553             url_fskip(pb, ret);
 554             asf->packet_pos= url_ftell(&s->pb);
 555             ret = asf_get_packet(s);
 556             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 557             if (ret < 0 || url_feof(pb))
 558                 return AVERROR_IO;
 559             asf->packet_time_start = 0;
 560             continue;
 561         }
 562         if (asf->packet_time_start == 0) {
 563             /* read frame header */
 564             int num = get_byte(pb);
 565             asf->packet_segments--;
 566             rsize++;
 567             asf->packet_key_frame = (num & 0x80) >> 7;
 568             asf->stream_index = asf->asfid2avid[num & 0x7f];
 569             // sequence should be ignored!
 570             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 571             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 572             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 573 //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);
 574             if (asf->packet_replic_size > 1) {
 575                 assert(asf->packet_replic_size >= 8);
 576                 // it should be always at least 8 bytes - FIXME validate
 577                 asf->packet_obj_size = get_le32(pb);
 578                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
 579                 if (asf->packet_replic_size > 8)
 580                     url_fskip(pb, asf->packet_replic_size - 8);
 581                 rsize += asf->packet_replic_size; // FIXME - check validity
 582             } else if (asf->packet_replic_size==1){
 583                 // multipacket - frag_offset is begining timestamp
 584                 asf->packet_time_start = asf->packet_frag_offset;
 585                 asf->packet_frag_offset = 0;
 586                 asf->packet_frag_timestamp = asf->packet_timestamp;
 587
 588                 asf->packet_time_delta = get_byte(pb);
 589                 rsize++;
 590             }else{
 591                 assert(asf->packet_replic_size==0);
 592             }
 593             if (asf->packet_flags & 0x01) {
 594                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 595 #undef DO_2BITS
 596                 //printf("Fragsize %d\n", asf->packet_frag_size);
 597             } else {
 598                 asf->packet_frag_size = asf->packet_size_left - rsize;
 599                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 600             }
 601             if (asf->packet_replic_size == 1) {
 602                 asf->packet_multi_size = asf->packet_frag_size;
 603                 if (asf->packet_multi_size > asf->packet_size_left) {
 604                     asf->packet_segments = 0;
 605                     continue;
 606                 }
 607             }
 608             asf->packet_size_left -= rsize;
 609             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 610
 611             if (asf->stream_index < 0
 612                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 613                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 614                 ) {
 615                 asf->packet_time_start = 0;
 616                 /* unhandled packet (should not happen) */
 617                 url_fskip(pb, asf->packet_frag_size);
 618                 asf->packet_size_left -= asf->packet_frag_size;
 619                 if(asf->stream_index < 0)
 620                     av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
 621                 continue;
 622             }
 623             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 624         }
 625         asf_st = asf->asf_st;
 626
 627         if ((asf->packet_frag_offset != asf_st->frag_offset
 628              || (asf->packet_frag_offset
 629                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
 630            ) {
 631             /* cannot continue current packet: free it */
 632             // FIXME better check if packet was already allocated
 633             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
 634                    asf_st->pkt.size,
 635                    asf->packet_obj_size,
 636                    asf->packet_frag_offset, asf_st->frag_offset,
 637                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
 638             if (asf_st->pkt.size)
 639                 av_free_packet(&asf_st->pkt);
 640             asf_st->frag_offset = 0;
 641             if (asf->packet_frag_offset != 0) {
 642                 url_fskip(pb, asf->packet_frag_size);
 643                 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
 644                 asf->packet_size_left -= asf->packet_frag_size;
 645                 continue;
 646             }
 647         }
 648         if (asf->packet_replic_size == 1) {
 649             // frag_offset is here used as the begining timestamp
 650             asf->packet_frag_timestamp = asf->packet_time_start;
 651             asf->packet_time_start += asf->packet_time_delta;
 652             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 653             asf->packet_size_left--;
 654             asf->packet_multi_size--;
 655             if (asf->packet_multi_size < asf->packet_obj_size)
 656             {
 657                 asf->packet_time_start = 0;
 658                 url_fskip(pb, asf->packet_multi_size);
 659                 asf->packet_size_left -= asf->packet_multi_size;
 660                 continue;
 661             }
 662             asf->packet_multi_size -= asf->packet_obj_size;
 663             //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);
 664         }
 665         if (asf_st->frag_offset == 0) {
 666             /* new packet */
 667             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 668             asf_st->seq = asf->packet_seq;
 669             asf_st->pkt.pts = asf->packet_frag_timestamp;
 670             asf_st->pkt.stream_index = asf->stream_index;
 671             asf_st->pkt.pos =
 672             asf_st->packet_pos= asf->packet_pos;
 673 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 674 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 675 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 676             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 677                 asf->packet_key_frame = 1;
 678             if (asf->packet_key_frame)
 679                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 680         }
 681
 682         /* read data */
 683         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 684         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 685         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 686         asf->packet_size_left -= asf->packet_frag_size;
 687         if (asf->packet_size_left < 0)
 688             continue;
 689         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 690                    asf->packet_frag_size);
 691         asf_st->frag_offset += asf->packet_frag_size;
 692         /* test if whole packet is read */
 693         if (asf_st->frag_offset == asf_st->pkt.size) {
 694             /* return packet */
 695             if (asf_st->ds_span > 1) {
 696                 /* packet descrambling */
 697                 char* newdata = av_malloc(asf_st->pkt.size);
 698                 if (newdata) {
 699                     int offset = 0;
 700                     while (offset < asf_st->pkt.size) {
 701                         int off = offset / asf_st->ds_chunk_size;
 702                         int row = off / asf_st->ds_span;
 703                         int col = off % asf_st->ds_span;
 704                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 705                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 706                         memcpy(newdata + offset,
 707                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 708                                asf_st->ds_chunk_size);
 709                         offset += asf_st->ds_chunk_size;
 710                     }
 711                     av_free(asf_st->pkt.data);
 712                     asf_st->pkt.data = newdata;
 713                 }
 714             }
 715             asf_st->frag_offset = 0;
 716             memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
 717             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 718             asf_st->pkt.size = 0;
 719             asf_st->pkt.data = 0;
 720             break; // packet completed
 721         }
 722     }
 723     return 0;
 724 }
 725
 726 static int asf_read_close(AVFormatContext *s)
 727 {
 728     int i;
 729
 730     for(i=0;i<s->nb_streams;i++) {
 731         AVStream *st = s->streams[i];
 732         av_free(st->priv_data);
 733     av_free(st->codec->palctrl);
 734     }
 735     return 0;
 736 }
 737
 738 // Added to support seeking after packets have been read
 739 // If information is not reset, read_packet fails due to
 740 // leftover information from previous reads
 741 static void asf_reset_header(AVFormatContext *s)
 742 {
 743     ASFContext *asf = s->priv_data;
 744     ASFStream *asf_st;
 745     int i;
 746
 747     asf->packet_nb_frames = 0;
 748     asf->packet_timestamp_start = -1;
 749     asf->packet_timestamp_end = -1;
 750     asf->packet_size_left = 0;
 751     asf->packet_segments = 0;
 752     asf->packet_flags = 0;
 753     asf->packet_property = 0;
 754     asf->packet_timestamp = 0;
 755     asf->packet_segsizetype = 0;
 756     asf->packet_segments = 0;
 757     asf->packet_seq = 0;
 758     asf->packet_replic_size = 0;
 759     asf->packet_key_frame = 0;
 760     asf->packet_padsize = 0;
 761     asf->packet_frag_offset = 0;
 762     asf->packet_frag_size = 0;
 763     asf->packet_frag_timestamp = 0;
 764     asf->packet_multi_size = 0;
 765     asf->packet_obj_size = 0;
 766     asf->packet_time_delta = 0;
 767     asf->packet_time_start = 0;
 768
 769     for(i=0; i<s->nb_streams; i++){
 770         asf_st= s->streams[i]->priv_data;
 771         av_free_packet(&asf_st->pkt);
 772         asf_st->frag_offset=0;
 773         asf_st->seq=0;
 774     }
 775     asf->asf_st= NULL;
 776 }
 777
 778 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 779 {
 780     ASFContext *asf = s->priv_data;
 781     AVPacket pkt1, *pkt = &pkt1;
 782     ASFStream *asf_st;
 783     int64_t pts;
 784     int64_t pos= *ppos;
 785     int i;
 786     int64_t start_pos[s->nb_streams];
 787
 788     for(i=0; i<s->nb_streams; i++){
 789         start_pos[i]= pos;
 790     }
 791
 792     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 793     *ppos= pos;
 794     url_fseek(&s->pb, pos, SEEK_SET);
 795
 796 //printf("asf_read_pts\n");
 797     asf_reset_header(s);
 798     for(;;){
 799         if (av_read_frame(s, pkt) < 0){
 800             av_log(s, AV_LOG_INFO, "seek failed\n");
 801             return AV_NOPTS_VALUE;
 802         }
 803
 804         pts= pkt->pts;
 805
 806         av_free_packet(pkt);
 807         if(pkt->flags&PKT_FLAG_KEY){
 808             i= pkt->stream_index;
 809
 810             asf_st= s->streams[i]->priv_data;
 811
 812             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 813             pos= asf_st->packet_pos;
 814
 815             av_add_index_entry(s->streams[i], pos, pkt->size, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 816             start_pos[i]= asf_st->packet_pos + 1;
 817
 818             if(pkt->stream_index == stream_index)
 819                break;
 820         }
 821     }
 822
 823     *ppos= pos;
 824 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
 825
 826     return pts;
 827 }
 828
 829 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 830 {
 831     ASFContext *asf = s->priv_data;
 832
 833     if (asf->packet_size <= 0)
 834         return -1;
 835
 836     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
 837         return -1;
 838
 839     asf_reset_header(s);
 840     return 0;
 841 }
 842
 843 AVInputFormat asf_demuxer = {
 844     "asf",
 845     "asf format",
 846     sizeof(ASFContext),
 847     asf_probe,
 848     asf_read_header,
 849     asf_read_packet,
 850     asf_read_close,
 851     asf_read_seek,
 852     asf_read_pts,
 853 };