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     0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
  35 };
  36
  37 /**********************************/
  38 /* decoding */
  39
  40 //#define DEBUG
  41
  42 #ifdef DEBUG
  43 #define PRINT_IF_GUID(g,cmp) \
  44 if (!memcmp(g, &cmp, sizeof(GUID))) \
  45     printf("(GUID: %s) ", #cmp)
  46
  47 static void print_guid(const GUID *g)
  48 {
  49     int i;
  50     PRINT_IF_GUID(g, asf_header);
  51     else PRINT_IF_GUID(g, file_header);
  52     else PRINT_IF_GUID(g, stream_header);
  53     else PRINT_IF_GUID(g, audio_stream);
  54     else PRINT_IF_GUID(g, audio_conceal_none);
  55     else PRINT_IF_GUID(g, video_stream);
  56     else PRINT_IF_GUID(g, video_conceal_none);
  57     else PRINT_IF_GUID(g, command_stream);
  58     else PRINT_IF_GUID(g, comment_header);
  59     else PRINT_IF_GUID(g, codec_comment_header);
  60     else PRINT_IF_GUID(g, codec_comment1_header);
  61     else PRINT_IF_GUID(g, data_header);
  62     else PRINT_IF_GUID(g, index_guid);
  63     else PRINT_IF_GUID(g, head1_guid);
  64     else PRINT_IF_GUID(g, head2_guid);
  65     else PRINT_IF_GUID(g, my_guid);
  66     else PRINT_IF_GUID(g, ext_stream_header);
  67     else PRINT_IF_GUID(g, extended_content_header);
  68     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  69     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  70     else
  71         printf("(GUID: unknown) ");
  72     printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
  73     for(i=0;i<8;i++)
  74         printf(" 0x%02x,", g->v4[i]);
  75     printf("}\n");
  76 }
  77 #undef PRINT_IF_GUID
  78 #endif
  79
  80 static void get_guid(ByteIOContext *s, GUID *g)
  81 {
  82     int i;
  83
  84     g->v1 = get_le32(s);
  85     g->v2 = get_le16(s);
  86     g->v3 = get_le16(s);
  87     for(i=0;i<8;i++)
  88         g->v4[i] = get_byte(s);
  89 }
  90
  91 #if 0
  92 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  93 {
  94     int len, c;
  95     char *q;
  96
  97     len = get_le16(pb);
  98     q = buf;
  99     while (len > 0) {
 100         c = get_le16(pb);
 101         if ((q - buf) < buf_size - 1)
 102             *q++ = c;
 103         len--;
 104     }
 105     *q = '\0';
 106 }
 107 #endif
 108
 109 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 110 {
 111     char* q = buf;
 112     len /= 2;
 113     while (len--) {
 114         uint8_t tmp;
 115         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 116     }
 117     *q = '\0';
 118 }
 119
 120 static int asf_probe(AVProbeData *pd)
 121 {
 122     GUID g;
 123     const unsigned char *p;
 124     int i;
 125
 126     /* check file header */
 127     if (pd->buf_size <= 32)
 128         return 0;
 129     p = pd->buf;
 130     g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
 131     p += 4;
 132     g.v2 = p[0] | (p[1] << 8);
 133     p += 2;
 134     g.v3 = p[0] | (p[1] << 8);
 135     p += 2;
 136     for(i=0;i<8;i++)
 137         g.v4[i] = *p++;
 138
 139     if (!memcmp(&g, &asf_header, sizeof(GUID)))
 140         return AVPROBE_SCORE_MAX;
 141     else
 142         return 0;
 143 }
 144
 145 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 146 {
 147     ASFContext *asf = s->priv_data;
 148     GUID g;
 149     ByteIOContext *pb = &s->pb;
 150     AVStream *st;
 151     ASFStream *asf_st;
 152     int size, i;
 153     int64_t gsize;
 154
 155     get_guid(pb, &g);
 156     if (memcmp(&g, &asf_header, sizeof(GUID)))
 157         goto fail;
 158     get_le64(pb);
 159     get_le32(pb);
 160     get_byte(pb);
 161     get_byte(pb);
 162     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 163     for(;;) {
 164         get_guid(pb, &g);
 165         gsize = get_le64(pb);
 166 #ifdef DEBUG
 167         printf("%08"PRIx64": ", url_ftell(pb) - 24);
 168         print_guid(&g);
 169         printf("  size=0x%"PRIx64"\n", gsize);
 170 #endif
 171         if (gsize < 24)
 172             goto fail;
 173         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 174             get_guid(pb, &asf->hdr.guid);
 175             asf->hdr.file_size          = get_le64(pb);
 176             asf->hdr.create_time        = get_le64(pb);
 177             asf->hdr.packets_count      = get_le64(pb);
 178             asf->hdr.send_time          = get_le64(pb);
 179             asf->hdr.play_time          = get_le64(pb);
 180             asf->hdr.preroll            = get_le32(pb);
 181             asf->hdr.ignore             = get_le32(pb);
 182             asf->hdr.flags              = get_le32(pb);
 183             asf->hdr.min_pktsize        = get_le32(pb);
 184             asf->hdr.max_pktsize        = get_le32(pb);
 185             asf->hdr.max_bitrate        = get_le32(pb);
 186             asf->packet_size = asf->hdr.max_pktsize;
 187             asf->nb_packets = asf->hdr.packets_count;
 188         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 189             int type, type_specific_size, sizeX;
 190             uint64_t total_size;
 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             asf->data_object_offset = url_ftell(pb);
 331             if (gsize != (uint64_t)-1 && gsize >= 24) {
 332                 asf->data_object_size = gsize - 24;
 333             } else {
 334                 asf->data_object_size = (uint64_t)-1;
 335             }
 336             break;
 337         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 338             int len1, len2, len3, len4, len5;
 339
 340             len1 = get_le16(pb);
 341             len2 = get_le16(pb);
 342             len3 = get_le16(pb);
 343             len4 = get_le16(pb);
 344             len5 = get_le16(pb);
 345             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
 346             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
 347             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 348             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
 349             url_fskip(pb, len5);
 350        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 351                 int desc_count, i;
 352
 353                 desc_count = get_le16(pb);
 354                 for(i=0;i<desc_count;i++)
 355                 {
 356                         int name_len,value_type,value_len;
 357                         uint64_t value_num = 0;
 358                         char *name, *value;
 359
 360                         name_len = get_le16(pb);
 361                         name = (char *)av_malloc(name_len * 2);
 362                         get_str16_nolen(pb, name_len, name, name_len * 2);
 363                         value_type = get_le16(pb);
 364                         value_len = get_le16(pb);
 365                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 366                         {
 367                                 value = (char *)av_malloc(value_len * 2);
 368                                 get_str16_nolen(pb, value_len, value,
 369                                         value_len * 2);
 370                                 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
 371                                 av_free(value);
 372                         }
 373                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 374                         {
 375                                 if (value_type==2) value_num = get_le32(pb);
 376                                 if (value_type==3) value_num = get_le32(pb);
 377                                 if (value_type==4) value_num = get_le64(pb);
 378                                 if (value_type==5) value_num = get_le16(pb);
 379                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
 380                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
 381                         }
 382                         av_free(name);
 383                 }
 384         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 385             int ext_len, payload_ext_ct, stream_ct;
 386             uint32_t ext_d;
 387             int64_t pos_ex_st;
 388             pos_ex_st = url_ftell(pb);
 389
 390             get_le64(pb);
 391             get_le64(pb);
 392             get_le32(pb);
 393             get_le32(pb);
 394             get_le32(pb);
 395             get_le32(pb);
 396             get_le32(pb);
 397             get_le32(pb);
 398             get_le32(pb);
 399             get_le32(pb);
 400             get_le16(pb);
 401             get_le16(pb);
 402             get_le64(pb);
 403             stream_ct = get_le16(pb);
 404             payload_ext_ct = get_le16(pb);
 405
 406             for (i=0; i<stream_ct; i++){
 407                 get_le16(pb);
 408                 ext_len = get_le16(pb);
 409                 url_fseek(pb, ext_len, SEEK_CUR);
 410             }
 411
 412             for (i=0; i<payload_ext_ct; i++){
 413                 get_guid(pb, &g);
 414                 ext_d=get_le16(pb);
 415                 ext_len=get_le32(pb);
 416                 url_fseek(pb, ext_len, SEEK_CUR);
 417             }
 418
 419             // there could be a optional stream properties object to follow
 420             // if so the next iteration will pick it up
 421         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 422             int v1, v2;
 423             get_guid(pb, &g);
 424             v1 = get_le32(pb);
 425             v2 = get_le16(pb);
 426 #if 0
 427         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 428             int len, v1, n, num;
 429             char str[256], *q;
 430             char tag[16];
 431
 432             get_guid(pb, &g);
 433             print_guid(&g);
 434
 435             n = get_le32(pb);
 436             for(i=0;i<n;i++) {
 437                 num = get_le16(pb); /* stream number */
 438                 get_str16(pb, str, sizeof(str));
 439                 get_str16(pb, str, sizeof(str));
 440                 len = get_le16(pb);
 441                 q = tag;
 442                 while (len > 0) {
 443                     v1 = get_byte(pb);
 444                     if ((q - tag) < sizeof(tag) - 1)
 445                         *q++ = v1;
 446                     len--;
 447                 }
 448                 *q = '\0';
 449             }
 450 #endif
 451         } else if (url_feof(pb)) {
 452             goto fail;
 453         } else {
 454             url_fseek(pb, gsize - 24, SEEK_CUR);
 455         }
 456     }
 457     get_guid(pb, &g);
 458     get_le64(pb);
 459     get_byte(pb);
 460     get_byte(pb);
 461     if (url_feof(pb))
 462         goto fail;
 463     asf->data_offset = url_ftell(pb);
 464     asf->packet_size_left = 0;
 465
 466     return 0;
 467
 468  fail:
 469      for(i=0;i<s->nb_streams;i++) {
 470         AVStream *st = s->streams[i];
 471         if (st) {
 472             av_free(st->priv_data);
 473             av_free(st->codec->extradata);
 474         }
 475         av_free(st);
 476     }
 477     return -1;
 478 }
 479
 480 #define DO_2BITS(bits, var, defval) \
 481     switch (bits & 3) \
 482     { \
 483     case 3: var = get_le32(pb); rsize += 4; break; \
 484     case 2: var = get_le16(pb); rsize += 2; break; \
 485     case 1: var = get_byte(pb); rsize++; break; \
 486     default: var = defval; break; \
 487     }
 488
 489 static int asf_get_packet(AVFormatContext *s)
 490 {
 491     ASFContext *asf = s->priv_data;
 492     ByteIOContext *pb = &s->pb;
 493     uint32_t packet_length, padsize;
 494     int rsize = 9;
 495     int c;
 496
 497     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
 498
 499     c = get_byte(pb);
 500     if (c != 0x82) {
 501         if (!url_feof(pb))
 502             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 503     }
 504     if ((c & 0x0f) == 2) { // always true for now
 505         if (get_le16(pb) != 0) {
 506             if (!url_feof(pb))
 507                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 508             return AVERROR_IO;
 509         }
 510         rsize+=2;
 511 /*    }else{
 512         if (!url_feof(pb))
 513             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 514         return AVERROR_IO;*/
 515     }
 516
 517     asf->packet_flags = get_byte(pb);
 518     asf->packet_property = get_byte(pb);
 519
 520     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 521     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 522     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 523
 524     //the following checks prevent overflows and infinite loops
 525     if(packet_length >= (1U<<29)){
 526         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 527         return 0; // FIXME this should be -1
 528     }
 529     if(padsize >= (1U<<29)){
 530         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 531         return 0; // FIXME this should be -1
 532     }
 533
 534     asf->packet_timestamp = get_le32(pb);
 535     get_le16(pb); /* duration */
 536     // rsize has at least 11 bytes which have to be present
 537
 538     if (asf->packet_flags & 0x01) {
 539         asf->packet_segsizetype = get_byte(pb); rsize++;
 540         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 541     } else {
 542         asf->packet_segments = 1;
 543         asf->packet_segsizetype = 0x80;
 544     }
 545     asf->packet_size_left = packet_length - padsize - rsize;
 546     if (packet_length < asf->hdr.min_pktsize)
 547         padsize += asf->hdr.min_pktsize - packet_length;
 548     asf->packet_padsize = padsize;
 549 #ifdef DEBUG
 550     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 551 #endif
 552     return 0;
 553 }
 554
 555 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 556 {
 557     ASFContext *asf = s->priv_data;
 558     ASFStream *asf_st = 0;
 559     ByteIOContext *pb = &s->pb;
 560     //static int pc = 0;
 561     for (;;) {
 562         int rsize = 0;
 563         if (asf->packet_size_left < FRAME_HEADER_SIZE
 564             || asf->packet_segments < 1) {
 565             //asf->packet_size_left <= asf->packet_padsize) {
 566             int ret = asf->packet_size_left + asf->packet_padsize;
 567             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 568             if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
 569                 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
 570             assert(ret>=0);
 571             /* fail safe */
 572             url_fskip(pb, ret);
 573             asf->packet_pos= url_ftell(&s->pb);
 574             if (asf->data_object_size != (uint64_t)-1 &&
 575                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 576                 return AVERROR_IO; /* Do not exceed the size of the data object */
 577             ret = asf_get_packet(s);
 578             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 579             if (ret < 0 || url_feof(pb))
 580                 return AVERROR_IO;
 581             asf->packet_time_start = 0;
 582             continue;
 583         }
 584         if (asf->packet_time_start == 0) {
 585             /* read frame header */
 586             int num = get_byte(pb);
 587             asf->packet_segments--;
 588             rsize++;
 589             asf->packet_key_frame = (num & 0x80) >> 7;
 590             asf->stream_index = asf->asfid2avid[num & 0x7f];
 591             // sequence should be ignored!
 592             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 593             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 594             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 595 //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);
 596             if (asf->packet_replic_size > 1) {
 597                 assert(asf->packet_replic_size >= 8);
 598                 // it should be always at least 8 bytes - FIXME validate
 599                 asf->packet_obj_size = get_le32(pb);
 600                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
 601                 if (asf->packet_replic_size > 8)
 602                     url_fskip(pb, asf->packet_replic_size - 8);
 603                 rsize += asf->packet_replic_size; // FIXME - check validity
 604             } else if (asf->packet_replic_size==1){
 605                 // multipacket - frag_offset is begining timestamp
 606                 asf->packet_time_start = asf->packet_frag_offset;
 607                 asf->packet_frag_offset = 0;
 608                 asf->packet_frag_timestamp = asf->packet_timestamp;
 609
 610                 asf->packet_time_delta = get_byte(pb);
 611                 rsize++;
 612             }else{
 613                 assert(asf->packet_replic_size==0);
 614             }
 615             if (asf->packet_flags & 0x01) {
 616                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 617 #undef DO_2BITS
 618                 //printf("Fragsize %d\n", asf->packet_frag_size);
 619             } else {
 620                 asf->packet_frag_size = asf->packet_size_left - rsize;
 621                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 622             }
 623             if (asf->packet_replic_size == 1) {
 624                 asf->packet_multi_size = asf->packet_frag_size;
 625                 if (asf->packet_multi_size > asf->packet_size_left) {
 626                     asf->packet_segments = 0;
 627                     continue;
 628                 }
 629             }
 630             asf->packet_size_left -= rsize;
 631             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 632
 633             if (asf->stream_index < 0
 634                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 635                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 636                 ) {
 637                 asf->packet_time_start = 0;
 638                 /* unhandled packet (should not happen) */
 639                 url_fskip(pb, asf->packet_frag_size);
 640                 asf->packet_size_left -= asf->packet_frag_size;
 641                 if(asf->stream_index < 0)
 642                     av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
 643                 continue;
 644             }
 645             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 646         }
 647         asf_st = asf->asf_st;
 648
 649         if ((asf->packet_frag_offset != asf_st->frag_offset
 650              || (asf->packet_frag_offset
 651                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
 652            ) {
 653             /* cannot continue current packet: free it */
 654             // FIXME better check if packet was already allocated
 655             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
 656                    asf_st->pkt.size,
 657                    asf->packet_obj_size,
 658                    asf->packet_frag_offset, asf_st->frag_offset,
 659                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
 660             if (asf_st->pkt.size)
 661                 av_free_packet(&asf_st->pkt);
 662             asf_st->frag_offset = 0;
 663             if (asf->packet_frag_offset != 0) {
 664                 url_fskip(pb, asf->packet_frag_size);
 665                 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
 666                 asf->packet_size_left -= asf->packet_frag_size;
 667                 continue;
 668             }
 669         }
 670         if (asf->packet_replic_size == 1) {
 671             // frag_offset is here used as the begining timestamp
 672             asf->packet_frag_timestamp = asf->packet_time_start;
 673             asf->packet_time_start += asf->packet_time_delta;
 674             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 675             asf->packet_size_left--;
 676             asf->packet_multi_size--;
 677             if (asf->packet_multi_size < asf->packet_obj_size)
 678             {
 679                 asf->packet_time_start = 0;
 680                 url_fskip(pb, asf->packet_multi_size);
 681                 asf->packet_size_left -= asf->packet_multi_size;
 682                 continue;
 683             }
 684             asf->packet_multi_size -= asf->packet_obj_size;
 685             //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);
 686         }
 687         if (asf_st->frag_offset == 0) {
 688             /* new packet */
 689             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 690             asf_st->seq = asf->packet_seq;
 691             asf_st->pkt.pts = asf->packet_frag_timestamp;
 692             asf_st->pkt.stream_index = asf->stream_index;
 693             asf_st->pkt.pos =
 694             asf_st->packet_pos= asf->packet_pos;
 695 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 696 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 697 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 698             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 699                 asf->packet_key_frame = 1;
 700             if (asf->packet_key_frame)
 701                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 702         }
 703
 704         /* read data */
 705         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 706         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 707         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 708         asf->packet_size_left -= asf->packet_frag_size;
 709         if (asf->packet_size_left < 0)
 710             continue;
 711         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 712                    asf->packet_frag_size);
 713         asf_st->frag_offset += asf->packet_frag_size;
 714         /* test if whole packet is read */
 715         if (asf_st->frag_offset == asf_st->pkt.size) {
 716             /* return packet */
 717             if (asf_st->ds_span > 1) {
 718                 /* packet descrambling */
 719                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 720                 if (newdata) {
 721                     int offset = 0;
 722                     while (offset < asf_st->pkt.size) {
 723                         int off = offset / asf_st->ds_chunk_size;
 724                         int row = off / asf_st->ds_span;
 725                         int col = off % asf_st->ds_span;
 726                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 727                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 728                         memcpy(newdata + offset,
 729                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 730                                asf_st->ds_chunk_size);
 731                         offset += asf_st->ds_chunk_size;
 732                     }
 733                     av_free(asf_st->pkt.data);
 734                     asf_st->pkt.data = newdata;
 735                 }
 736             }
 737             asf_st->frag_offset = 0;
 738             memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
 739             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 740             asf_st->pkt.size = 0;
 741             asf_st->pkt.data = 0;
 742             break; // packet completed
 743         }
 744     }
 745     return 0;
 746 }
 747
 748 static int asf_read_close(AVFormatContext *s)
 749 {
 750     int i;
 751
 752     for(i=0;i<s->nb_streams;i++) {
 753         AVStream *st = s->streams[i];
 754         av_free(st->priv_data);
 755     av_free(st->codec->palctrl);
 756     }
 757     return 0;
 758 }
 759
 760 // Added to support seeking after packets have been read
 761 // If information is not reset, read_packet fails due to
 762 // leftover information from previous reads
 763 static void asf_reset_header(AVFormatContext *s)
 764 {
 765     ASFContext *asf = s->priv_data;
 766     ASFStream *asf_st;
 767     int i;
 768
 769     asf->packet_nb_frames = 0;
 770     asf->packet_timestamp_start = -1;
 771     asf->packet_timestamp_end = -1;
 772     asf->packet_size_left = 0;
 773     asf->packet_segments = 0;
 774     asf->packet_flags = 0;
 775     asf->packet_property = 0;
 776     asf->packet_timestamp = 0;
 777     asf->packet_segsizetype = 0;
 778     asf->packet_segments = 0;
 779     asf->packet_seq = 0;
 780     asf->packet_replic_size = 0;
 781     asf->packet_key_frame = 0;
 782     asf->packet_padsize = 0;
 783     asf->packet_frag_offset = 0;
 784     asf->packet_frag_size = 0;
 785     asf->packet_frag_timestamp = 0;
 786     asf->packet_multi_size = 0;
 787     asf->packet_obj_size = 0;
 788     asf->packet_time_delta = 0;
 789     asf->packet_time_start = 0;
 790
 791     for(i=0; i<s->nb_streams; i++){
 792         asf_st= s->streams[i]->priv_data;
 793         av_free_packet(&asf_st->pkt);
 794         asf_st->frag_offset=0;
 795         asf_st->seq=0;
 796     }
 797     asf->asf_st= NULL;
 798 }
 799
 800 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 801 {
 802     ASFContext *asf = s->priv_data;
 803     AVPacket pkt1, *pkt = &pkt1;
 804     ASFStream *asf_st;
 805     int64_t pts;
 806     int64_t pos= *ppos;
 807     int i;
 808     int64_t start_pos[s->nb_streams];
 809
 810     for(i=0; i<s->nb_streams; i++){
 811         start_pos[i]= pos;
 812     }
 813
 814     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 815     *ppos= pos;
 816     url_fseek(&s->pb, pos, SEEK_SET);
 817
 818 //printf("asf_read_pts\n");
 819     asf_reset_header(s);
 820     for(;;){
 821         if (av_read_frame(s, pkt) < 0){
 822             av_log(s, AV_LOG_INFO, "seek failed\n");
 823             return AV_NOPTS_VALUE;
 824         }
 825
 826         pts= pkt->pts;
 827
 828         av_free_packet(pkt);
 829         if(pkt->flags&PKT_FLAG_KEY){
 830             i= pkt->stream_index;
 831
 832             asf_st= s->streams[i]->priv_data;
 833
 834             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 835             pos= asf_st->packet_pos;
 836
 837             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 838             start_pos[i]= asf_st->packet_pos + 1;
 839
 840             if(pkt->stream_index == stream_index)
 841                break;
 842         }
 843     }
 844
 845     *ppos= pos;
 846 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 847
 848     return pts;
 849 }
 850
 851 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 852 {
 853     GUID g;
 854     ASFContext *asf = s->priv_data;
 855     int64_t gsize, itime;
 856     int64_t pos, current_pos, index_pts;
 857     int i;
 858     int pct,ict;
 859
 860     current_pos = url_ftell(&s->pb);
 861
 862     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 863     get_guid(&s->pb, &g);
 864     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 865         gsize = get_le64(&s->pb);
 866         get_guid(&s->pb, &g);
 867         itime=get_le64(&s->pb);
 868         pct=get_le32(&s->pb);
 869         ict=get_le32(&s->pb);
 870         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
 871
 872         for (i=0;i<ict;i++){
 873             int pktnum=get_le32(&s->pb);
 874             int pktct =get_le16(&s->pb);
 875             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
 876
 877             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
 878             index_pts=av_rescale(itime, i, 10000);
 879
 880             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
 881         }
 882         asf->index_read= 1;
 883     }
 884     url_fseek(&s->pb, current_pos, SEEK_SET);
 885 }
 886
 887 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 888 {
 889     ASFContext *asf = s->priv_data;
 890     AVStream *st = s->streams[stream_index];
 891     int64_t pos;
 892     int index;
 893
 894     if (asf->packet_size <= 0)
 895         return -1;
 896
 897     if (!asf->index_read)
 898         asf_build_simple_index(s, stream_index);
 899
 900     if(!(asf->index_read && st->index_entries)){
 901         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
 902             return -1;
 903     }else{
 904         index= av_index_search_timestamp(st, pts, flags);
 905         if(index<0)
 906             return -1;
 907
 908         /* find the position */
 909         pos = st->index_entries[index].pos;
 910         pts = st->index_entries[index].timestamp;
 911
 912     // various attempts to find key frame have failed so far
 913     //    asf_reset_header(s);
 914     //    url_fseek(&s->pb, pos, SEEK_SET);
 915     //    key_pos = pos;
 916     //     for(i=0;i<16;i++){
 917     //         pos = url_ftell(&s->pb);
 918     //         if (av_read_frame(s, &pkt) < 0){
 919     //             av_log(s, AV_LOG_INFO, "seek failed\n");
 920     //             return -1;
 921     //         }
 922     //         asf_st = s->streams[stream_index]->priv_data;
 923     //         pos += st->parser->frame_offset;
 924     //
 925     //         if (pkt.size > b) {
 926     //             b = pkt.size;
 927     //             key_pos = pos;
 928     //         }
 929     //
 930     //         av_free_packet(&pkt);
 931     //     }
 932
 933         /* do the seek */
 934         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
 935         url_fseek(&s->pb, pos, SEEK_SET);
 936     }
 937     asf_reset_header(s);
 938     return 0;
 939 }
 940
 941 AVInputFormat asf_demuxer = {
 942     "asf",
 943     "asf format",
 944     sizeof(ASFContext),
 945     asf_probe,
 946     asf_read_header,
 947     asf_read_packet,
 948     asf_read_close,
 949     asf_read_seek,
 950     asf_read_pts,
 951 };