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             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 207                 st->duration = asf->hdr.send_time /
 208                     (10000000 / 1000) - st->start_time;
 209             }
 210             get_guid(pb, &g);
 211
 212             test_for_ext_stream_audio = 0;
 213             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 214                 type = CODEC_TYPE_AUDIO;
 215             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 216                 type = CODEC_TYPE_VIDEO;
 217             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 218                 type = CODEC_TYPE_UNKNOWN;
 219             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 220                 test_for_ext_stream_audio = 1;
 221                 type = CODEC_TYPE_UNKNOWN;
 222             } else {
 223                 goto fail;
 224             }
 225             get_guid(pb, &g);
 226             total_size = get_le64(pb);
 227             type_specific_size = get_le32(pb);
 228             get_le32(pb);
 229             st->id = get_le16(pb) & 0x7f; /* stream id */
 230             // mapping of asf ID to AV stream ID;
 231             asf->asfid2avid[st->id] = s->nb_streams - 1;
 232
 233             get_le32(pb);
 234
 235             if (test_for_ext_stream_audio) {
 236                 get_guid(pb, &g);
 237                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 238                     type = CODEC_TYPE_AUDIO;
 239                     get_guid(pb, &g);
 240                     get_le32(pb);
 241                     get_le32(pb);
 242                     get_le32(pb);
 243                     get_guid(pb, &g);
 244                     get_le32(pb);
 245                 }
 246             }
 247
 248             st->codec->codec_type = type;
 249             if (type == CODEC_TYPE_AUDIO) {
 250                 get_wav_header(pb, st->codec, type_specific_size);
 251                 st->need_parsing = 1;
 252                 /* We have to init the frame size at some point .... */
 253                 pos2 = url_ftell(pb);
 254                 if (gsize > (pos2 + 8 - pos1 + 24)) {
 255                     asf_st->ds_span = get_byte(pb);
 256                     asf_st->ds_packet_size = get_le16(pb);
 257                     asf_st->ds_chunk_size = get_le16(pb);
 258                     asf_st->ds_data_size = get_le16(pb);
 259                     asf_st->ds_silence_data = get_byte(pb);
 260                 }
 261                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 262                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 263                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 264                 if (asf_st->ds_span > 1) {
 265                     if (!asf_st->ds_chunk_size
 266                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
 267                         asf_st->ds_span = 0; // disable descrambling
 268                 }
 269                 switch (st->codec->codec_id) {
 270                 case CODEC_ID_MP3:
 271                     st->codec->frame_size = MPA_FRAME_SIZE;
 272                     break;
 273                 case CODEC_ID_PCM_S16LE:
 274                 case CODEC_ID_PCM_S16BE:
 275                 case CODEC_ID_PCM_U16LE:
 276                 case CODEC_ID_PCM_U16BE:
 277                 case CODEC_ID_PCM_S8:
 278                 case CODEC_ID_PCM_U8:
 279                 case CODEC_ID_PCM_ALAW:
 280                 case CODEC_ID_PCM_MULAW:
 281                     st->codec->frame_size = 1;
 282                     break;
 283                 default:
 284                     /* This is probably wrong, but it prevents a crash later */
 285                     st->codec->frame_size = 1;
 286                     break;
 287                 }
 288             } else if (type == CODEC_TYPE_VIDEO) {
 289                 get_le32(pb);
 290                 get_le32(pb);
 291                 get_byte(pb);
 292                 size = get_le16(pb); /* size */
 293                 sizeX= get_le32(pb); /* size */
 294                 st->codec->width = get_le32(pb);
 295                 st->codec->height = get_le32(pb);
 296                 /* not available for asf */
 297                 get_le16(pb); /* panes */
 298                 st->codec->bits_per_sample = get_le16(pb); /* depth */
 299                 tag1 = get_le32(pb);
 300                 url_fskip(pb, 20);
 301 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 302                 size= sizeX;
 303                 if (size > 40) {
 304                     st->codec->extradata_size = size - 40;
 305                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 306                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 307                 }
 308
 309         /* Extract palette from extradata if bpp <= 8 */
 310         /* This code assumes that extradata contains only palette */
 311         /* This is true for all paletted codecs implemented in ffmpeg */
 312         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
 313             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 314 #ifdef WORDS_BIGENDIAN
 315             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 316                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 317 #else
 318             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 319                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 320 #endif
 321             st->codec->palctrl->palette_changed = 1;
 322         }
 323
 324                 st->codec->codec_tag = tag1;
 325                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 326                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 327                     st->need_parsing = 1;
 328             }
 329             pos2 = url_ftell(pb);
 330             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 331         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
 332             asf->data_object_offset = url_ftell(pb);
 333             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 334             if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
 335                 asf->data_object_size = gsize - 24;
 336             } else {
 337                 asf->data_object_size = (uint64_t)-1;
 338             }
 339             break;
 340         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 341             int len1, len2, len3, len4, len5;
 342
 343             len1 = get_le16(pb);
 344             len2 = get_le16(pb);
 345             len3 = get_le16(pb);
 346             len4 = get_le16(pb);
 347             len5 = get_le16(pb);
 348             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
 349             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
 350             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 351             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
 352             url_fskip(pb, len5);
 353        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 354                 int desc_count, i;
 355
 356                 desc_count = get_le16(pb);
 357                 for(i=0;i<desc_count;i++)
 358                 {
 359                         int name_len,value_type,value_len;
 360                         uint64_t value_num = 0;
 361                         char *name, *value;
 362
 363                         name_len = get_le16(pb);
 364                         name = (char *)av_malloc(name_len * 2);
 365                         get_str16_nolen(pb, name_len, name, name_len * 2);
 366                         value_type = get_le16(pb);
 367                         value_len = get_le16(pb);
 368                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 369                         {
 370                                 value = (char *)av_malloc(value_len * 2);
 371                                 get_str16_nolen(pb, value_len, value,
 372                                         value_len * 2);
 373                                 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
 374                                 if (strcmp(name,"WM/Genre")==0) { pstrcpy(s->genre, sizeof(s->genre), value); }
 375                                 av_free(value);
 376                         }
 377                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 378                         {
 379                                 if (value_type==2) value_num = get_le32(pb);
 380                                 if (value_type==3) value_num = get_le32(pb);
 381                                 if (value_type==4) value_num = get_le64(pb);
 382                                 if (value_type==5) value_num = get_le16(pb);
 383                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
 384                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
 385                         }
 386                         av_free(name);
 387                 }
 388         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 389             int ext_len, payload_ext_ct, stream_ct;
 390             uint32_t ext_d;
 391             int64_t pos_ex_st;
 392             pos_ex_st = url_ftell(pb);
 393
 394             get_le64(pb);
 395             get_le64(pb);
 396             get_le32(pb);
 397             get_le32(pb);
 398             get_le32(pb);
 399             get_le32(pb);
 400             get_le32(pb);
 401             get_le32(pb);
 402             get_le32(pb);
 403             get_le32(pb);
 404             get_le16(pb);
 405             get_le16(pb);
 406             get_le64(pb);
 407             stream_ct = get_le16(pb);
 408             payload_ext_ct = get_le16(pb);
 409
 410             for (i=0; i<stream_ct; i++){
 411                 get_le16(pb);
 412                 ext_len = get_le16(pb);
 413                 url_fseek(pb, ext_len, SEEK_CUR);
 414             }
 415
 416             for (i=0; i<payload_ext_ct; i++){
 417                 get_guid(pb, &g);
 418                 ext_d=get_le16(pb);
 419                 ext_len=get_le32(pb);
 420                 url_fseek(pb, ext_len, SEEK_CUR);
 421             }
 422
 423             // there could be a optional stream properties object to follow
 424             // if so the next iteration will pick it up
 425         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 426             int v1, v2;
 427             get_guid(pb, &g);
 428             v1 = get_le32(pb);
 429             v2 = get_le16(pb);
 430 #if 0
 431         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 432             int len, v1, n, num;
 433             char str[256], *q;
 434             char tag[16];
 435
 436             get_guid(pb, &g);
 437             print_guid(&g);
 438
 439             n = get_le32(pb);
 440             for(i=0;i<n;i++) {
 441                 num = get_le16(pb); /* stream number */
 442                 get_str16(pb, str, sizeof(str));
 443                 get_str16(pb, str, sizeof(str));
 444                 len = get_le16(pb);
 445                 q = tag;
 446                 while (len > 0) {
 447                     v1 = get_byte(pb);
 448                     if ((q - tag) < sizeof(tag) - 1)
 449                         *q++ = v1;
 450                     len--;
 451                 }
 452                 *q = '\0';
 453             }
 454 #endif
 455         } else if (url_feof(pb)) {
 456             goto fail;
 457         } else {
 458             url_fseek(pb, gsize - 24, SEEK_CUR);
 459         }
 460     }
 461     get_guid(pb, &g);
 462     get_le64(pb);
 463     get_byte(pb);
 464     get_byte(pb);
 465     if (url_feof(pb))
 466         goto fail;
 467     asf->data_offset = url_ftell(pb);
 468     asf->packet_size_left = 0;
 469
 470     return 0;
 471
 472  fail:
 473      for(i=0;i<s->nb_streams;i++) {
 474         AVStream *st = s->streams[i];
 475         if (st) {
 476             av_free(st->priv_data);
 477             av_free(st->codec->extradata);
 478         }
 479         av_free(st);
 480     }
 481     return -1;
 482 }
 483
 484 #define DO_2BITS(bits, var, defval) \
 485     switch (bits & 3) \
 486     { \
 487     case 3: var = get_le32(pb); rsize += 4; break; \
 488     case 2: var = get_le16(pb); rsize += 2; break; \
 489     case 1: var = get_byte(pb); rsize++; break; \
 490     default: var = defval; break; \
 491     }
 492
 493 static int asf_get_packet(AVFormatContext *s)
 494 {
 495     ASFContext *asf = s->priv_data;
 496     ByteIOContext *pb = &s->pb;
 497     uint32_t packet_length, padsize;
 498     int rsize = 9;
 499     int c;
 500
 501     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
 502
 503     c = get_byte(pb);
 504     if (c != 0x82) {
 505         if (!url_feof(pb))
 506             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 507     }
 508     if ((c & 0x0f) == 2) { // always true for now
 509         if (get_le16(pb) != 0) {
 510             if (!url_feof(pb))
 511                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 512             return AVERROR_IO;
 513         }
 514         rsize+=2;
 515 /*    }else{
 516         if (!url_feof(pb))
 517             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 518         return AVERROR_IO;*/
 519     }
 520
 521     asf->packet_flags = get_byte(pb);
 522     asf->packet_property = get_byte(pb);
 523
 524     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 525     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 526     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 527
 528     //the following checks prevent overflows and infinite loops
 529     if(packet_length >= (1U<<29)){
 530         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 531         return 0; // FIXME this should be -1
 532     }
 533     if(padsize >= (1U<<29)){
 534         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 535         return 0; // FIXME this should be -1
 536     }
 537
 538     asf->packet_timestamp = get_le32(pb);
 539     get_le16(pb); /* duration */
 540     // rsize has at least 11 bytes which have to be present
 541
 542     if (asf->packet_flags & 0x01) {
 543         asf->packet_segsizetype = get_byte(pb); rsize++;
 544         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 545     } else {
 546         asf->packet_segments = 1;
 547         asf->packet_segsizetype = 0x80;
 548     }
 549     asf->packet_size_left = packet_length - padsize - rsize;
 550     if (packet_length < asf->hdr.min_pktsize)
 551         padsize += asf->hdr.min_pktsize - packet_length;
 552     asf->packet_padsize = padsize;
 553 #ifdef DEBUG
 554     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 555 #endif
 556     return 0;
 557 }
 558
 559 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 560 {
 561     ASFContext *asf = s->priv_data;
 562     ASFStream *asf_st = 0;
 563     ByteIOContext *pb = &s->pb;
 564     //static int pc = 0;
 565     for (;;) {
 566         int rsize = 0;
 567         if (asf->packet_size_left < FRAME_HEADER_SIZE
 568             || asf->packet_segments < 1) {
 569             //asf->packet_size_left <= asf->packet_padsize) {
 570             int ret = asf->packet_size_left + asf->packet_padsize;
 571             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 572             if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
 573                 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
 574             assert(ret>=0);
 575             /* fail safe */
 576             url_fskip(pb, ret);
 577             asf->packet_pos= url_ftell(&s->pb);
 578             if (asf->data_object_size != (uint64_t)-1 &&
 579                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 580                 return AVERROR_IO; /* Do not exceed the size of the data object */
 581             ret = asf_get_packet(s);
 582             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 583             if (ret < 0 || url_feof(pb))
 584                 return AVERROR_IO;
 585             asf->packet_time_start = 0;
 586             continue;
 587         }
 588         if (asf->packet_time_start == 0) {
 589             /* read frame header */
 590             int num = get_byte(pb);
 591             asf->packet_segments--;
 592             rsize++;
 593             asf->packet_key_frame = (num & 0x80) >> 7;
 594             asf->stream_index = asf->asfid2avid[num & 0x7f];
 595             // sequence should be ignored!
 596             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 597             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 598             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 599 //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);
 600             if (asf->packet_replic_size > 1) {
 601                 assert(asf->packet_replic_size >= 8);
 602                 // it should be always at least 8 bytes - FIXME validate
 603                 asf->packet_obj_size = get_le32(pb);
 604                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
 605                 if (asf->packet_replic_size > 8)
 606                     url_fskip(pb, asf->packet_replic_size - 8);
 607                 rsize += asf->packet_replic_size; // FIXME - check validity
 608             } else if (asf->packet_replic_size==1){
 609                 // multipacket - frag_offset is begining timestamp
 610                 asf->packet_time_start = asf->packet_frag_offset;
 611                 asf->packet_frag_offset = 0;
 612                 asf->packet_frag_timestamp = asf->packet_timestamp;
 613
 614                 asf->packet_time_delta = get_byte(pb);
 615                 rsize++;
 616             }else{
 617                 assert(asf->packet_replic_size==0);
 618             }
 619             if (asf->packet_flags & 0x01) {
 620                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 621 #undef DO_2BITS
 622                 //printf("Fragsize %d\n", asf->packet_frag_size);
 623             } else {
 624                 asf->packet_frag_size = asf->packet_size_left - rsize;
 625                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 626             }
 627             if (asf->packet_replic_size == 1) {
 628                 asf->packet_multi_size = asf->packet_frag_size;
 629                 if (asf->packet_multi_size > asf->packet_size_left) {
 630                     asf->packet_segments = 0;
 631                     continue;
 632                 }
 633             }
 634             asf->packet_size_left -= rsize;
 635             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 636
 637             if (asf->stream_index < 0
 638                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 639                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 640                 ) {
 641                 asf->packet_time_start = 0;
 642                 /* unhandled packet (should not happen) */
 643                 url_fskip(pb, asf->packet_frag_size);
 644                 asf->packet_size_left -= asf->packet_frag_size;
 645                 if(asf->stream_index < 0)
 646                     av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
 647                 continue;
 648             }
 649             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 650         }
 651         asf_st = asf->asf_st;
 652
 653         if ((asf->packet_frag_offset != asf_st->frag_offset
 654              || (asf->packet_frag_offset
 655                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
 656            ) {
 657             /* cannot continue current packet: free it */
 658             // FIXME better check if packet was already allocated
 659             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
 660                    asf_st->pkt.size,
 661                    asf->packet_obj_size,
 662                    asf->packet_frag_offset, asf_st->frag_offset,
 663                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
 664             if (asf_st->pkt.size)
 665                 av_free_packet(&asf_st->pkt);
 666             asf_st->frag_offset = 0;
 667             if (asf->packet_frag_offset != 0) {
 668                 url_fskip(pb, asf->packet_frag_size);
 669                 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
 670                 asf->packet_size_left -= asf->packet_frag_size;
 671                 continue;
 672             }
 673         }
 674         if (asf->packet_replic_size == 1) {
 675             // frag_offset is here used as the begining timestamp
 676             asf->packet_frag_timestamp = asf->packet_time_start;
 677             asf->packet_time_start += asf->packet_time_delta;
 678             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 679             asf->packet_size_left--;
 680             asf->packet_multi_size--;
 681             if (asf->packet_multi_size < asf->packet_obj_size)
 682             {
 683                 asf->packet_time_start = 0;
 684                 url_fskip(pb, asf->packet_multi_size);
 685                 asf->packet_size_left -= asf->packet_multi_size;
 686                 continue;
 687             }
 688             asf->packet_multi_size -= asf->packet_obj_size;
 689             //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);
 690         }
 691         if (asf_st->frag_offset == 0) {
 692             /* new packet */
 693             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 694             asf_st->seq = asf->packet_seq;
 695             asf_st->pkt.pts = asf->packet_frag_timestamp;
 696             asf_st->pkt.stream_index = asf->stream_index;
 697             asf_st->pkt.pos =
 698             asf_st->packet_pos= asf->packet_pos;
 699 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 700 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 701 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 702             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 703                 asf->packet_key_frame = 1;
 704             if (asf->packet_key_frame)
 705                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 706         }
 707
 708         /* read data */
 709         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 710         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 711         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 712         asf->packet_size_left -= asf->packet_frag_size;
 713         if (asf->packet_size_left < 0)
 714             continue;
 715         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 716                    asf->packet_frag_size);
 717         asf_st->frag_offset += asf->packet_frag_size;
 718         /* test if whole packet is read */
 719         if (asf_st->frag_offset == asf_st->pkt.size) {
 720             /* return packet */
 721             if (asf_st->ds_span > 1) {
 722                 /* packet descrambling */
 723                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 724                 if (newdata) {
 725                     int offset = 0;
 726                     while (offset < asf_st->pkt.size) {
 727                         int off = offset / asf_st->ds_chunk_size;
 728                         int row = off / asf_st->ds_span;
 729                         int col = off % asf_st->ds_span;
 730                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 731                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 732                         memcpy(newdata + offset,
 733                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 734                                asf_st->ds_chunk_size);
 735                         offset += asf_st->ds_chunk_size;
 736                     }
 737                     av_free(asf_st->pkt.data);
 738                     asf_st->pkt.data = newdata;
 739                 }
 740             }
 741             asf_st->frag_offset = 0;
 742             memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
 743             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 744             asf_st->pkt.size = 0;
 745             asf_st->pkt.data = 0;
 746             break; // packet completed
 747         }
 748     }
 749     return 0;
 750 }
 751
 752 static int asf_read_close(AVFormatContext *s)
 753 {
 754     int i;
 755
 756     for(i=0;i<s->nb_streams;i++) {
 757         AVStream *st = s->streams[i];
 758         av_free(st->priv_data);
 759     av_free(st->codec->palctrl);
 760     }
 761     return 0;
 762 }
 763
 764 // Added to support seeking after packets have been read
 765 // If information is not reset, read_packet fails due to
 766 // leftover information from previous reads
 767 static void asf_reset_header(AVFormatContext *s)
 768 {
 769     ASFContext *asf = s->priv_data;
 770     ASFStream *asf_st;
 771     int i;
 772
 773     asf->packet_nb_frames = 0;
 774     asf->packet_timestamp_start = -1;
 775     asf->packet_timestamp_end = -1;
 776     asf->packet_size_left = 0;
 777     asf->packet_segments = 0;
 778     asf->packet_flags = 0;
 779     asf->packet_property = 0;
 780     asf->packet_timestamp = 0;
 781     asf->packet_segsizetype = 0;
 782     asf->packet_segments = 0;
 783     asf->packet_seq = 0;
 784     asf->packet_replic_size = 0;
 785     asf->packet_key_frame = 0;
 786     asf->packet_padsize = 0;
 787     asf->packet_frag_offset = 0;
 788     asf->packet_frag_size = 0;
 789     asf->packet_frag_timestamp = 0;
 790     asf->packet_multi_size = 0;
 791     asf->packet_obj_size = 0;
 792     asf->packet_time_delta = 0;
 793     asf->packet_time_start = 0;
 794
 795     for(i=0; i<s->nb_streams; i++){
 796         asf_st= s->streams[i]->priv_data;
 797         av_free_packet(&asf_st->pkt);
 798         asf_st->frag_offset=0;
 799         asf_st->seq=0;
 800     }
 801     asf->asf_st= NULL;
 802 }
 803
 804 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 805 {
 806     ASFContext *asf = s->priv_data;
 807     AVPacket pkt1, *pkt = &pkt1;
 808     ASFStream *asf_st;
 809     int64_t pts;
 810     int64_t pos= *ppos;
 811     int i;
 812     int64_t start_pos[s->nb_streams];
 813
 814     for(i=0; i<s->nb_streams; i++){
 815         start_pos[i]= pos;
 816     }
 817
 818     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 819     *ppos= pos;
 820     url_fseek(&s->pb, pos, SEEK_SET);
 821
 822 //printf("asf_read_pts\n");
 823     asf_reset_header(s);
 824     for(;;){
 825         if (av_read_frame(s, pkt) < 0){
 826             av_log(s, AV_LOG_INFO, "seek failed\n");
 827             return AV_NOPTS_VALUE;
 828         }
 829
 830         pts= pkt->pts;
 831
 832         av_free_packet(pkt);
 833         if(pkt->flags&PKT_FLAG_KEY){
 834             i= pkt->stream_index;
 835
 836             asf_st= s->streams[i]->priv_data;
 837
 838             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 839             pos= asf_st->packet_pos;
 840
 841             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 842             start_pos[i]= asf_st->packet_pos + 1;
 843
 844             if(pkt->stream_index == stream_index)
 845                break;
 846         }
 847     }
 848
 849     *ppos= pos;
 850 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 851
 852     return pts;
 853 }
 854
 855 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 856 {
 857     GUID g;
 858     ASFContext *asf = s->priv_data;
 859     int64_t gsize, itime;
 860     int64_t pos, current_pos, index_pts;
 861     int i;
 862     int pct,ict;
 863
 864     current_pos = url_ftell(&s->pb);
 865
 866     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 867     get_guid(&s->pb, &g);
 868     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 869         gsize = get_le64(&s->pb);
 870         get_guid(&s->pb, &g);
 871         itime=get_le64(&s->pb);
 872         pct=get_le32(&s->pb);
 873         ict=get_le32(&s->pb);
 874         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
 875
 876         for (i=0;i<ict;i++){
 877             int pktnum=get_le32(&s->pb);
 878             int pktct =get_le16(&s->pb);
 879             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
 880
 881             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
 882             index_pts=av_rescale(itime, i, 10000);
 883
 884             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
 885         }
 886         asf->index_read= 1;
 887     }
 888     url_fseek(&s->pb, current_pos, SEEK_SET);
 889 }
 890
 891 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 892 {
 893     ASFContext *asf = s->priv_data;
 894     AVStream *st = s->streams[stream_index];
 895     int64_t pos;
 896     int index;
 897
 898     if (asf->packet_size <= 0)
 899         return -1;
 900
 901     if (!asf->index_read)
 902         asf_build_simple_index(s, stream_index);
 903
 904     if(!(asf->index_read && st->index_entries)){
 905         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
 906             return -1;
 907     }else{
 908         index= av_index_search_timestamp(st, pts, flags);
 909         if(index<0)
 910             return -1;
 911
 912         /* find the position */
 913         pos = st->index_entries[index].pos;
 914         pts = st->index_entries[index].timestamp;
 915
 916     // various attempts to find key frame have failed so far
 917     //    asf_reset_header(s);
 918     //    url_fseek(&s->pb, pos, SEEK_SET);
 919     //    key_pos = pos;
 920     //     for(i=0;i<16;i++){
 921     //         pos = url_ftell(&s->pb);
 922     //         if (av_read_frame(s, &pkt) < 0){
 923     //             av_log(s, AV_LOG_INFO, "seek failed\n");
 924     //             return -1;
 925     //         }
 926     //         asf_st = s->streams[stream_index]->priv_data;
 927     //         pos += st->parser->frame_offset;
 928     //
 929     //         if (pkt.size > b) {
 930     //             b = pkt.size;
 931     //             key_pos = pos;
 932     //         }
 933     //
 934     //         av_free_packet(&pkt);
 935     //     }
 936
 937         /* do the seek */
 938         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
 939         url_fseek(&s->pb, pos, SEEK_SET);
 940     }
 941     asf_reset_header(s);
 942     return 0;
 943 }
 944
 945 AVInputFormat asf_demuxer = {
 946     "asf",
 947     "asf format",
 948     sizeof(ASFContext),
 949     asf_probe,
 950     asf_read_header,
 951     asf_read_packet,
 952     asf_read_close,
 953     asf_read_seek,
 954     asf_read_pts,
 955 };