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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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, comment_header);
  55     else PRINT_IF_GUID(g, codec_comment_header);
  56     else PRINT_IF_GUID(g, codec_comment1_header);
  57     else PRINT_IF_GUID(g, data_header);
  58     else PRINT_IF_GUID(g, index_guid);
  59     else PRINT_IF_GUID(g, head1_guid);
  60     else PRINT_IF_GUID(g, head2_guid);
  61     else PRINT_IF_GUID(g, my_guid);
  62     else
  63         printf("(GUID: unknown) ");
  64     printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
  65     for(i=0;i<8;i++)
  66         printf(" 0x%02x,", g->v4[i]);
  67     printf("}\n");
  68 }
  69 #undef PRINT_IF_GUID(g,cmp)
  70 #endif
  71
  72 static void get_guid(ByteIOContext *s, GUID *g)
  73 {
  74     int i;
  75
  76     g->v1 = get_le32(s);
  77     g->v2 = get_le16(s);
  78     g->v3 = get_le16(s);
  79     for(i=0;i<8;i++)
  80         g->v4[i] = get_byte(s);
  81 }
  82
  83 #if 0
  84 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  85 {
  86     int len, c;
  87     char *q;
  88
  89     len = get_le16(pb);
  90     q = buf;
  91     while (len > 0) {
  92         c = get_le16(pb);
  93         if ((q - buf) < buf_size - 1)
  94             *q++ = c;
  95         len--;
  96     }
  97     *q = '\0';
  98 }
  99 #endif
 100
 101 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 102 {
 103     int c;
 104     char *q;
 105
 106     q = buf;
 107     while (len > 0) {
 108         c = get_le16(pb);
 109         if ((q - buf) < buf_size - 1)
 110             *q++ = c;
 111         len-=2;
 112     }
 113     *q = '\0';
 114 }
 115
 116 static int asf_probe(AVProbeData *pd)
 117 {
 118     GUID g;
 119     const unsigned char *p;
 120     int i;
 121
 122     /* check file header */
 123     if (pd->buf_size <= 32)
 124         return 0;
 125     p = pd->buf;
 126     g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
 127     p += 4;
 128     g.v2 = p[0] | (p[1] << 8);
 129     p += 2;
 130     g.v3 = p[0] | (p[1] << 8);
 131     p += 2;
 132     for(i=0;i<8;i++)
 133         g.v4[i] = *p++;
 134
 135     if (!memcmp(&g, &asf_header, sizeof(GUID)))
 136         return AVPROBE_SCORE_MAX;
 137     else
 138         return 0;
 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
 151     get_guid(pb, &g);
 152     if (memcmp(&g, &asf_header, sizeof(GUID)))
 153         goto fail;
 154     get_le64(pb);
 155     get_le32(pb);
 156     get_byte(pb);
 157     get_byte(pb);
 158     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 159     for(;;) {
 160         get_guid(pb, &g);
 161         gsize = get_le64(pb);
 162 #ifdef DEBUG
 163         printf("%08Lx: ", url_ftell(pb) - 24);
 164         print_guid(&g);
 165         printf("  size=0x%Lx\n", gsize);
 166 #endif
 167         if (gsize < 24)
 168             goto fail;
 169         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 170             get_guid(pb, &asf->hdr.guid);
 171             asf->hdr.file_size          = get_le64(pb);
 172             asf->hdr.create_time        = get_le64(pb);
 173             asf->hdr.packets_count      = get_le64(pb);
 174             asf->hdr.play_time          = get_le64(pb);
 175             asf->hdr.send_time          = get_le64(pb);
 176             asf->hdr.preroll            = get_le32(pb);
 177             asf->hdr.ignore             = get_le32(pb);
 178             asf->hdr.flags              = get_le32(pb);
 179             asf->hdr.min_pktsize        = get_le32(pb);
 180             asf->hdr.max_pktsize        = get_le32(pb);
 181             asf->hdr.max_bitrate        = get_le32(pb);
 182             asf->packet_size = asf->hdr.max_pktsize;
 183             asf->nb_packets = asf->hdr.packets_count;
 184         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 185             int type, total_size, type_specific_size;
 186             unsigned int tag1;
 187             int64_t pos1, pos2;
 188
 189             pos1 = url_ftell(pb);
 190
 191             st = av_new_stream(s, 0);
 192             if (!st)
 193                 goto fail;
 194             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 195             asf_st = av_mallocz(sizeof(ASFStream));
 196             if (!asf_st)
 197                 goto fail;
 198             st->priv_data = asf_st;
 199             st->start_time = asf->hdr.preroll * (int64_t)AV_TIME_BASE / 1000;
 200             st->duration = asf->hdr.send_time /
 201                 (10000000 / AV_TIME_BASE) - st->start_time;
 202             get_guid(pb, &g);
 203             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 204                 type = CODEC_TYPE_AUDIO;
 205             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 206                 type = CODEC_TYPE_VIDEO;
 207             } else {
 208                 goto fail;
 209             }
 210             get_guid(pb, &g);
 211             total_size = get_le64(pb);
 212             type_specific_size = get_le32(pb);
 213             get_le32(pb);
 214             st->id = get_le16(pb) & 0x7f; /* stream id */
 215             // mapping of asf ID to AV stream ID;
 216             asf->asfid2avid[st->id] = s->nb_streams - 1;
 217
 218             get_le32(pb);
 219             st->codec.codec_type = type;
 220             /* 1 fps default (XXX: put 0 fps instead) */
 221             st->codec.frame_rate = 1000;
 222             st->codec.frame_rate_base = 1;
 223             if (type == CODEC_TYPE_AUDIO) {
 224                 get_wav_header(pb, &st->codec, type_specific_size);
 225                 st->need_parsing = 1;
 226                 /* We have to init the frame size at some point .... */
 227                 pos2 = url_ftell(pb);
 228                 if (gsize > (pos2 + 8 - pos1 + 24)) {
 229                     asf_st->ds_span = get_byte(pb);
 230                     asf_st->ds_packet_size = get_le16(pb);
 231                     asf_st->ds_chunk_size = get_le16(pb);
 232                     asf_st->ds_data_size = get_le16(pb);
 233                     asf_st->ds_silence_data = get_byte(pb);
 234                 }
 235                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 236                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 237                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 238                 if (asf_st->ds_span > 1) {
 239                     if (!asf_st->ds_chunk_size
 240                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
 241                         asf_st->ds_span = 0; // disable descrambling
 242                 }
 243                 switch (st->codec.codec_id) {
 244                 case CODEC_ID_MP3:
 245                     st->codec.frame_size = MPA_FRAME_SIZE;
 246                     break;
 247                 case CODEC_ID_PCM_S16LE:
 248                 case CODEC_ID_PCM_S16BE:
 249                 case CODEC_ID_PCM_U16LE:
 250                 case CODEC_ID_PCM_U16BE:
 251                 case CODEC_ID_PCM_S8:
 252                 case CODEC_ID_PCM_U8:
 253                 case CODEC_ID_PCM_ALAW:
 254                 case CODEC_ID_PCM_MULAW:
 255                     st->codec.frame_size = 1;
 256                     break;
 257                 default:
 258                     /* This is probably wrong, but it prevents a crash later */
 259                     st->codec.frame_size = 1;
 260                     break;
 261                 }
 262             } else {
 263                 get_le32(pb);
 264                 get_le32(pb);
 265                 get_byte(pb);
 266                 size = get_le16(pb); /* size */
 267                 get_le32(pb); /* size */
 268                 st->codec.width = get_le32(pb);
 269                 st->codec.height = get_le32(pb);
 270                 /* not available for asf */
 271                 get_le16(pb); /* panes */
 272                 st->codec.bits_per_sample = get_le16(pb); /* depth */
 273                 tag1 = get_le32(pb);
 274                 url_fskip(pb, 20);
 275                 if (size > 40) {
 276                     st->codec.extradata_size = size - 40;
 277                     st->codec.extradata = av_mallocz(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 278                     get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
 279                 }
 280
 281         /* Extract palette from extradata if bpp <= 8 */
 282         /* This code assumes that extradata contains only palette */
 283         /* This is true for all paletted codecs implemented in ffmpeg */
 284         if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
 285             st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
 286 #ifdef WORDS_BIGENDIAN
 287             for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
 288                 st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
 289 #else
 290             memcpy(st->codec.palctrl->palette, st->codec.extradata,
 291                    FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
 292 #endif
 293             st->codec.palctrl->palette_changed = 1;
 294         }
 295
 296                 st->codec.codec_tag = tag1;
 297                 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
 298                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 299                     st->need_parsing = 1;
 300             }
 301             pos2 = url_ftell(pb);
 302             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 303         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
 304             break;
 305         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 306             int len1, len2, len3, len4, len5;
 307
 308             len1 = get_le16(pb);
 309             len2 = get_le16(pb);
 310             len3 = get_le16(pb);
 311             len4 = get_le16(pb);
 312             len5 = get_le16(pb);
 313             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
 314             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
 315             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 316             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
 317             url_fskip(pb, len5);
 318        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 319                 int desc_count, i;
 320
 321                 desc_count = get_le16(pb);
 322                 for(i=0;i<desc_count;i++)
 323                 {
 324                         int name_len,value_type,value_len,value_num = 0;
 325                         char *name, *value;
 326
 327                         name_len = get_le16(pb);
 328                         name = (char *)av_mallocz(name_len);
 329                         get_str16_nolen(pb, name_len, name, name_len);
 330                         value_type = get_le16(pb);
 331                         value_len = get_le16(pb);
 332                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 333                         {
 334                                 value = (char *)av_mallocz(value_len);
 335                                 get_str16_nolen(pb, value_len, value, value_len);
 336                                 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
 337                                 av_free(value);
 338                         }
 339                         if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 340                         {
 341                                 if (value_type==2) value_num = get_le32(pb);
 342                                 if (value_type==3) value_num = get_le32(pb);
 343                                 if (value_type==4) value_num = get_le64(pb);
 344                                 if (value_type==5) value_num = get_le16(pb);
 345                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
 346                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
 347                         }
 348                         av_free(name);
 349                 }
 350 #if 0
 351         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 352             int v1, v2;
 353             get_guid(pb, &g);
 354             v1 = get_le32(pb);
 355             v2 = get_le16(pb);
 356         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 357             int len, v1, n, num;
 358             char str[256], *q;
 359             char tag[16];
 360
 361             get_guid(pb, &g);
 362             print_guid(&g);
 363
 364             n = get_le32(pb);
 365             for(i=0;i<n;i++) {
 366                 num = get_le16(pb); /* stream number */
 367                 get_str16(pb, str, sizeof(str));
 368                 get_str16(pb, str, sizeof(str));
 369                 len = get_le16(pb);
 370                 q = tag;
 371                 while (len > 0) {
 372                     v1 = get_byte(pb);
 373                     if ((q - tag) < sizeof(tag) - 1)
 374                         *q++ = v1;
 375                     len--;
 376                 }
 377                 *q = '\0';
 378             }
 379 #endif
 380         } else if (url_feof(pb)) {
 381             goto fail;
 382         } else {
 383             url_fseek(pb, gsize - 24, SEEK_CUR);
 384         }
 385     }
 386     get_guid(pb, &g);
 387     get_le64(pb);
 388     get_byte(pb);
 389     get_byte(pb);
 390     if (url_feof(pb))
 391         goto fail;
 392     asf->data_offset = url_ftell(pb);
 393     asf->packet_size_left = 0;
 394
 395     return 0;
 396
 397  fail:
 398      for(i=0;i<s->nb_streams;i++) {
 399         AVStream *st = s->streams[i];
 400         if (st) {
 401             av_free(st->priv_data);
 402             av_free(st->codec.extradata);
 403         }
 404         av_free(st);
 405     }
 406     return -1;
 407 }
 408
 409 #define DO_2BITS(bits, var, defval) \
 410     switch (bits & 3) \
 411     { \
 412     case 3: var = get_le32(pb); rsize += 4; break; \
 413     case 2: var = get_le16(pb); rsize += 2; break; \
 414     case 1: var = get_byte(pb); rsize++; break; \
 415     default: var = defval; break; \
 416     }
 417
 418 static int asf_get_packet(AVFormatContext *s)
 419 {
 420     ASFContext *asf = s->priv_data;
 421     ByteIOContext *pb = &s->pb;
 422     uint32_t packet_length, padsize;
 423     int rsize = 9;
 424     int c;
 425
 426     if((url_ftell(&s->pb) - s->data_offset) % asf->packet_size)
 427         return -1;
 428     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
 429
 430     c = get_byte(pb);
 431     if (c != 0x82) {
 432         if (!url_feof(pb))
 433             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
 434     }
 435     if ((c & 0x0f) == 2) { // always true for now
 436         if (get_le16(pb) != 0) {
 437             if (!url_feof(pb))
 438                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 439             return AVERROR_IO;
 440         }
 441         rsize+=2;
 442 /*    }else{
 443         if (!url_feof(pb))
 444             printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
 445         return AVERROR_IO;*/
 446     }
 447
 448     asf->packet_flags = get_byte(pb);
 449     asf->packet_property = get_byte(pb);
 450
 451     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 452     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 453     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 454
 455     asf->packet_timestamp = get_le32(pb);
 456     get_le16(pb); /* duration */
 457     // rsize has at least 11 bytes which have to be present
 458
 459     if (asf->packet_flags & 0x01) {
 460         asf->packet_segsizetype = get_byte(pb); rsize++;
 461         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 462     } else {
 463         asf->packet_segments = 1;
 464         asf->packet_segsizetype = 0x80;
 465     }
 466     asf->packet_size_left = packet_length - padsize - rsize;
 467     if (packet_length < asf->hdr.min_pktsize)
 468         padsize += asf->hdr.min_pktsize - packet_length;
 469     asf->packet_padsize = padsize;
 470 #ifdef DEBUG
 471     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 472 #endif
 473     return 0;
 474 }
 475
 476 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 477 {
 478     ASFContext *asf = s->priv_data;
 479     ASFStream *asf_st = 0;
 480     ByteIOContext *pb = &s->pb;
 481     //static int pc = 0;
 482     for (;;) {
 483         int rsize = 0;
 484         if (asf->packet_size_left < FRAME_HEADER_SIZE
 485             || asf->packet_segments < 1) {
 486             //asf->packet_size_left <= asf->packet_padsize) {
 487             int ret = asf->packet_size_left + asf->packet_padsize;
 488             //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 489             /* fail safe */
 490             url_fskip(pb, ret);
 491             asf->packet_pos= url_ftell(&s->pb);
 492             ret = asf_get_packet(s);
 493             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 494             if (ret < 0 || url_feof(pb))
 495                 return AVERROR_IO;
 496             asf->packet_time_start = 0;
 497             continue;
 498         }
 499         if (asf->packet_time_start == 0) {
 500             /* read frame header */
 501             int num = get_byte(pb);
 502             asf->packet_segments--;
 503             rsize++;
 504             asf->packet_key_frame = (num & 0x80) >> 7;
 505             asf->stream_index = asf->asfid2avid[num & 0x7f];
 506             // sequence should be ignored!
 507             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 508             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 509             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 510 //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);
 511             if (asf->packet_replic_size > 1) {
 512                 assert(asf->packet_replic_size >= 8);
 513                 // it should be always at least 8 bytes - FIXME validate
 514                 asf->packet_obj_size = get_le32(pb);
 515                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
 516                 if (asf->packet_replic_size > 8)
 517                     url_fskip(pb, asf->packet_replic_size - 8);
 518                 rsize += asf->packet_replic_size; // FIXME - check validity
 519             } else if (asf->packet_replic_size==1){
 520                 // multipacket - frag_offset is begining timestamp
 521                 asf->packet_time_start = asf->packet_frag_offset;
 522                 asf->packet_frag_offset = 0;
 523                 asf->packet_frag_timestamp = asf->packet_timestamp;
 524
 525                 asf->packet_time_delta = get_byte(pb);
 526                 rsize++;
 527             }else{
 528                 assert(asf->packet_replic_size==0);
 529             }
 530             if (asf->packet_flags & 0x01) {
 531                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 532 #undef DO_2BITS
 533                 //printf("Fragsize %d\n", asf->packet_frag_size);
 534             } else {
 535                 asf->packet_frag_size = asf->packet_size_left - rsize;
 536                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 537             }
 538             if (asf->packet_replic_size == 1) {
 539                 asf->packet_multi_size = asf->packet_frag_size;
 540                 if (asf->packet_multi_size > asf->packet_size_left) {
 541                     asf->packet_segments = 0;
 542                     continue;
 543                 }
 544             }
 545             asf->packet_size_left -= rsize;
 546             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 547
 548             if (asf->stream_index < 0 || s->streams[asf->stream_index]->discard) {
 549                 asf->packet_time_start = 0;
 550                 /* unhandled packet (should not happen) */
 551                 url_fskip(pb, asf->packet_frag_size);
 552                 asf->packet_size_left -= asf->packet_frag_size;
 553                 if(asf->stream_index < 0)
 554                     av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
 555                 continue;
 556             }
 557             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 558         }
 559         asf_st = asf->asf_st;
 560
 561         if ((asf->packet_frag_offset != asf_st->frag_offset
 562              || (asf->packet_frag_offset
 563                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
 564            ) {
 565             /* cannot continue current packet: free it */
 566             // FIXME better check if packet was already allocated
 567             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
 568                    asf_st->pkt.size,
 569                    asf->packet_obj_size,
 570                    asf->packet_frag_offset, asf_st->frag_offset,
 571                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
 572             if (asf_st->pkt.size)
 573                 av_free_packet(&asf_st->pkt);
 574             asf_st->frag_offset = 0;
 575             if (asf->packet_frag_offset != 0) {
 576                 url_fskip(pb, asf->packet_frag_size);
 577                 av_log(s, AV_LOG_INFO, "ff asf parser skiping %db\n", asf->packet_frag_size);
 578                 asf->packet_size_left -= asf->packet_frag_size;
 579                 continue;
 580             }
 581         }
 582         if (asf->packet_replic_size == 1) {
 583             // frag_offset is here used as the begining timestamp
 584             asf->packet_frag_timestamp = asf->packet_time_start;
 585             asf->packet_time_start += asf->packet_time_delta;
 586             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 587             asf->packet_size_left--;
 588             asf->packet_multi_size--;
 589             if (asf->packet_multi_size < asf->packet_obj_size)
 590             {
 591                 asf->packet_time_start = 0;
 592                 url_fskip(pb, asf->packet_multi_size);
 593                 asf->packet_size_left -= asf->packet_multi_size;
 594                 continue;
 595             }
 596             asf->packet_multi_size -= asf->packet_obj_size;
 597             //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);
 598         }
 599         if (asf_st->frag_offset == 0) {
 600             /* new packet */
 601             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 602             asf_st->seq = asf->packet_seq;
 603             asf_st->pkt.pts = asf->packet_frag_timestamp;
 604             asf_st->pkt.stream_index = asf->stream_index;
 605             asf_st->packet_pos= asf->packet_pos;
 606 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 607 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 608 //s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 609             if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO)
 610                 asf->packet_key_frame = 1;
 611             if (asf->packet_key_frame)
 612                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 613         }
 614
 615         /* read data */
 616         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 617         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 618         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 619         asf->packet_size_left -= asf->packet_frag_size;
 620         if (asf->packet_size_left < 0)
 621             continue;
 622         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 623                    asf->packet_frag_size);
 624         asf_st->frag_offset += asf->packet_frag_size;
 625         /* test if whole packet is read */
 626         if (asf_st->frag_offset == asf_st->pkt.size) {
 627             /* return packet */
 628             if (asf_st->ds_span > 1) {
 629                 /* packet descrambling */
 630                 char* newdata = av_malloc(asf_st->pkt.size);
 631                 if (newdata) {
 632                     int offset = 0;
 633                     while (offset < asf_st->pkt.size) {
 634                         int off = offset / asf_st->ds_chunk_size;
 635                         int row = off / asf_st->ds_span;
 636                         int col = off % asf_st->ds_span;
 637                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 638                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 639                         memcpy(newdata + offset,
 640                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 641                                asf_st->ds_chunk_size);
 642                         offset += asf_st->ds_chunk_size;
 643                     }
 644                     av_free(asf_st->pkt.data);
 645                     asf_st->pkt.data = newdata;
 646                 }
 647             }
 648             asf_st->frag_offset = 0;
 649             memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
 650             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 651             asf_st->pkt.size = 0;
 652             asf_st->pkt.data = 0;
 653             break; // packet completed
 654         }
 655     }
 656     return 0;
 657 }
 658
 659 static int asf_read_close(AVFormatContext *s)
 660 {
 661     int i;
 662
 663     for(i=0;i<s->nb_streams;i++) {
 664         AVStream *st = s->streams[i];
 665         av_free(st->priv_data);
 666         av_free(st->codec.extradata);
 667     av_free(st->codec.palctrl);
 668     }
 669     return 0;
 670 }
 671
 672 // Added to support seeking after packets have been read
 673 // If information is not reset, read_packet fails due to
 674 // leftover information from previous reads
 675 static void asf_reset_header(AVFormatContext *s)
 676 {
 677     ASFContext *asf = s->priv_data;
 678     ASFStream *asf_st;
 679     int i;
 680
 681     asf->packet_nb_frames = 0;
 682     asf->packet_timestamp_start = -1;
 683     asf->packet_timestamp_end = -1;
 684     asf->packet_size_left = 0;
 685     asf->packet_segments = 0;
 686     asf->packet_flags = 0;
 687     asf->packet_property = 0;
 688     asf->packet_timestamp = 0;
 689     asf->packet_segsizetype = 0;
 690     asf->packet_segments = 0;
 691     asf->packet_seq = 0;
 692     asf->packet_replic_size = 0;
 693     asf->packet_key_frame = 0;
 694     asf->packet_padsize = 0;
 695     asf->packet_frag_offset = 0;
 696     asf->packet_frag_size = 0;
 697     asf->packet_frag_timestamp = 0;
 698     asf->packet_multi_size = 0;
 699     asf->packet_obj_size = 0;
 700     asf->packet_time_delta = 0;
 701     asf->packet_time_start = 0;
 702
 703     for(i=0; i<s->nb_streams; i++){
 704         asf_st= s->streams[i]->priv_data;
 705         av_free_packet(&asf_st->pkt);
 706         asf_st->frag_offset=0;
 707         asf_st->seq=0;
 708     }
 709     asf->asf_st= NULL;
 710 }
 711
 712 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 713 {
 714     ASFContext *asf = s->priv_data;
 715     AVPacket pkt1, *pkt = &pkt1;
 716     ASFStream *asf_st;
 717     int64_t pts;
 718     int64_t pos= *ppos;
 719     int i;
 720     int64_t start_pos[s->nb_streams];
 721
 722     for(i=0; i<s->nb_streams; i++){
 723         start_pos[i]= pos;
 724     }
 725
 726     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 727     *ppos= pos;
 728     url_fseek(&s->pb, pos, SEEK_SET);
 729
 730 //printf("asf_read_pts\n");
 731     asf_reset_header(s);
 732     for(;;){
 733         if (av_read_frame(s, pkt) < 0){
 734             av_log(s, AV_LOG_INFO, "seek failed\n");
 735             return AV_NOPTS_VALUE;
 736         }
 737
 738         pts= pkt->pts * 1000 / AV_TIME_BASE;
 739
 740         av_free_packet(pkt);
 741         if(pkt->flags&PKT_FLAG_KEY){
 742             i= pkt->stream_index;
 743
 744             asf_st= s->streams[i]->priv_data;
 745
 746             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 747             pos= asf_st->packet_pos;
 748
 749             av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 750             start_pos[i]= asf_st->packet_pos + 1;
 751
 752             if(pkt->stream_index == stream_index)
 753                break;
 754         }
 755     }
 756
 757     *ppos= pos;
 758 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
 759
 760     return pts;
 761 }
 762
 763 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 764 {
 765     ASFContext *asf = s->priv_data;
 766
 767     if (asf->packet_size <= 0)
 768         return -1;
 769
 770     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
 771         return -1;
 772
 773     asf_reset_header(s);
 774     return 0;
 775 }
 776
 777 static AVInputFormat asf_iformat = {
 778     "asf",
 779     "asf format",
 780     sizeof(ASFContext),
 781     asf_probe,
 782     asf_read_header,
 783     asf_read_packet,
 784     asf_read_close,
 785     asf_read_seek,
 786     asf_read_pts,
 787 };
 788
 789 #ifdef CONFIG_ENCODERS
 790     extern AVOutputFormat asf_oformat;
 791     extern AVOutputFormat asf_stream_oformat;
 792 #endif //CONFIG_ENCODERS
 793
 794 int asf_init(void)
 795 {
 796     av_register_input_format(&asf_iformat);
 797 #ifdef CONFIG_ENCODERS
 798     av_register_output_format(&asf_oformat);
 799     av_register_output_format(&asf_stream_oformat);
 800 #endif //CONFIG_ENCODERS
 801     return 0;
 802 }