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

   1 /*
   2  * ASF compatible demuxer
   3  * Copyright (c) 2000, 2001 Fabrice Bellard.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #include "avformat.h"
  22 #include "riff.h"
  23 #include "mpegaudio.h"
  24 #include "asf.h"
  25 #include "common.h"
  26
  27 #undef NDEBUG
  28 #include <assert.h>
  29
  30 #define FRAME_HEADER_SIZE 17
  31 // Fix Me! FRAME_HEADER_SIZE may be different.
  32
  33 static const GUID index_guid = {
  34     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  35 };
  36
  37 /**********************************/
  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 PRINT_IF_GUID(g, metadata_header);
  71     else
  72         printf("(GUID: unknown) ");
  73     for(i=0;i<16;i++)
  74         printf(" 0x%02x,", (*g)[i]);
  75     printf("}\n");
  76 }
  77 #undef PRINT_IF_GUID
  78 #endif
  79
  80 static void get_guid(ByteIOContext *s, GUID *g)
  81 {
  82     assert(sizeof(*g) == 16);
  83     get_buffer(s, g, sizeof(*g));
  84 }
  85
  86 #if 0
  87 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  88 {
  89     int len, c;
  90     char *q;
  91
  92     len = get_le16(pb);
  93     q = buf;
  94     while (len > 0) {
  95         c = get_le16(pb);
  96         if ((q - buf) < buf_size - 1)
  97             *q++ = c;
  98         len--;
  99     }
 100     *q = '\0';
 101 }
 102 #endif
 103
 104 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 105 {
 106     char* q = buf;
 107     len /= 2;
 108     while (len--) {
 109         uint8_t tmp;
 110         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 111     }
 112     *q = '\0';
 113 }
 114
 115 static int asf_probe(AVProbeData *pd)
 116 {
 117     /* check file header */
 118     if (pd->buf_size <= 32)
 119         return 0;
 120
 121     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
 122         return AVPROBE_SCORE_MAX;
 123     else
 124         return 0;
 125 }
 126
 127 static int get_value(ByteIOContext *pb, int type){
 128     switch(type){
 129         case 2: return get_le32(pb);
 130         case 3: return get_le32(pb);
 131         case 4: return get_le64(pb);
 132         case 5: return get_le16(pb);
 133         default:return INT_MIN;
 134     }
 135 }
 136
 137 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 138 {
 139     ASFContext *asf = s->priv_data;
 140     GUID g;
 141     ByteIOContext *pb = &s->pb;
 142     AVStream *st;
 143     ASFStream *asf_st;
 144     int size, i;
 145     int64_t gsize;
 146     AVRational dar[128];
 147
 148     memset(dar, 0, sizeof(dar));
 149
 150     get_guid(pb, &g);
 151     if (memcmp(&g, &asf_header, sizeof(GUID)))
 152         goto fail;
 153     get_le64(pb);
 154     get_le32(pb);
 155     get_byte(pb);
 156     get_byte(pb);
 157     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 158     for(;;) {
 159         get_guid(pb, &g);
 160         gsize = get_le64(pb);
 161 #ifdef DEBUG
 162         printf("%08"PRIx64": ", url_ftell(pb) - 24);
 163         print_guid(&g);
 164         printf("  size=0x%"PRIx64"\n", gsize);
 165 #endif
 166         if (gsize < 24)
 167             goto fail;
 168         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 169             get_guid(pb, &asf->hdr.guid);
 170             asf->hdr.file_size          = get_le64(pb);
 171             asf->hdr.create_time        = get_le64(pb);
 172             asf->nb_packets             = get_le64(pb);
 173             asf->hdr.send_time          = get_le64(pb);
 174             asf->hdr.play_time          = get_le64(pb);
 175             asf->hdr.preroll            = get_le32(pb);
 176             asf->hdr.ignore             = get_le32(pb);
 177             asf->hdr.flags              = get_le32(pb);
 178             asf->hdr.min_pktsize        = get_le32(pb);
 179             asf->hdr.max_pktsize        = get_le32(pb);
 180             asf->hdr.max_bitrate        = get_le32(pb);
 181             asf->packet_size = asf->hdr.max_pktsize;
 182         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 183             int type, type_specific_size, sizeX;
 184             uint64_t total_size;
 185             unsigned int tag1;
 186             int64_t pos1, pos2;
 187             int test_for_ext_stream_audio;
 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;
 200             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 201                 st->duration = asf->hdr.send_time /
 202                     (10000000 / 1000) - st->start_time;
 203             }
 204             get_guid(pb, &g);
 205
 206             test_for_ext_stream_audio = 0;
 207             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 208                 type = CODEC_TYPE_AUDIO;
 209             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 210                 type = CODEC_TYPE_VIDEO;
 211             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 212                 type = CODEC_TYPE_UNKNOWN;
 213             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 214                 test_for_ext_stream_audio = 1;
 215                 type = CODEC_TYPE_UNKNOWN;
 216             } else {
 217                 goto fail;
 218             }
 219             get_guid(pb, &g);
 220             total_size = get_le64(pb);
 221             type_specific_size = get_le32(pb);
 222             get_le32(pb);
 223             st->id = get_le16(pb) & 0x7f; /* stream id */
 224             // mapping of asf ID to AV stream ID;
 225             asf->asfid2avid[st->id] = s->nb_streams - 1;
 226
 227             get_le32(pb);
 228
 229             if (test_for_ext_stream_audio) {
 230                 get_guid(pb, &g);
 231                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 232                     type = CODEC_TYPE_AUDIO;
 233                     get_guid(pb, &g);
 234                     get_le32(pb);
 235                     get_le32(pb);
 236                     get_le32(pb);
 237                     get_guid(pb, &g);
 238                     get_le32(pb);
 239                 }
 240             }
 241
 242             st->codec->codec_type = type;
 243             if (type == CODEC_TYPE_AUDIO) {
 244                 get_wav_header(pb, st->codec, type_specific_size);
 245                 st->need_parsing = 1;
 246                 /* We have to init the frame size at some point .... */
 247                 pos2 = url_ftell(pb);
 248                 if (gsize > (pos2 + 8 - pos1 + 24)) {
 249                     asf_st->ds_span = get_byte(pb);
 250                     asf_st->ds_packet_size = get_le16(pb);
 251                     asf_st->ds_chunk_size = get_le16(pb);
 252                     get_le16(pb); //ds_data_size
 253                     get_byte(pb); //ds_silence_data
 254                 }
 255                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 256                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 257                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 258                 if (asf_st->ds_span > 1) {
 259                     if (!asf_st->ds_chunk_size
 260                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 261                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 262                         asf_st->ds_span = 0; // disable descrambling
 263                 }
 264                 switch (st->codec->codec_id) {
 265                 case CODEC_ID_MP3:
 266                     st->codec->frame_size = MPA_FRAME_SIZE;
 267                     break;
 268                 case CODEC_ID_PCM_S16LE:
 269                 case CODEC_ID_PCM_S16BE:
 270                 case CODEC_ID_PCM_U16LE:
 271                 case CODEC_ID_PCM_U16BE:
 272                 case CODEC_ID_PCM_S8:
 273                 case CODEC_ID_PCM_U8:
 274                 case CODEC_ID_PCM_ALAW:
 275                 case CODEC_ID_PCM_MULAW:
 276                     st->codec->frame_size = 1;
 277                     break;
 278                 default:
 279                     /* This is probably wrong, but it prevents a crash later */
 280                     st->codec->frame_size = 1;
 281                     break;
 282                 }
 283             } else if (type == CODEC_TYPE_VIDEO) {
 284                 get_le32(pb);
 285                 get_le32(pb);
 286                 get_byte(pb);
 287                 size = get_le16(pb); /* size */
 288                 sizeX= get_le32(pb); /* size */
 289                 st->codec->width = get_le32(pb);
 290                 st->codec->height = get_le32(pb);
 291                 /* not available for asf */
 292                 get_le16(pb); /* panes */
 293                 st->codec->bits_per_sample = get_le16(pb); /* depth */
 294                 tag1 = get_le32(pb);
 295                 url_fskip(pb, 20);
 296 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 297                 size= sizeX;
 298                 if (size > 40) {
 299                     st->codec->extradata_size = size - 40;
 300                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 301                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 302                 }
 303
 304         /* Extract palette from extradata if bpp <= 8 */
 305         /* This code assumes that extradata contains only palette */
 306         /* This is true for all paletted codecs implemented in ffmpeg */
 307         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
 308             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 309 #ifdef WORDS_BIGENDIAN
 310             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 311                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 312 #else
 313             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 314                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 315 #endif
 316             st->codec->palctrl->palette_changed = 1;
 317         }
 318
 319                 st->codec->codec_tag = tag1;
 320                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 321                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 322                     st->need_parsing = 1;
 323             }
 324             pos2 = url_ftell(pb);
 325             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 326         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
 327             asf->data_object_offset = url_ftell(pb);
 328             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 329             if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
 330                 asf->data_object_size = gsize - 24;
 331             } else {
 332                 asf->data_object_size = (uint64_t)-1;
 333             }
 334             break;
 335         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 336             int len1, len2, len3, len4, len5;
 337
 338             len1 = get_le16(pb);
 339             len2 = get_le16(pb);
 340             len3 = get_le16(pb);
 341             len4 = get_le16(pb);
 342             len5 = get_le16(pb);
 343             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
 344             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
 345             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 346             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
 347             url_fskip(pb, len5);
 348        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 349                 int desc_count, i;
 350
 351                 desc_count = get_le16(pb);
 352                 for(i=0;i<desc_count;i++)
 353                 {
 354                         int name_len,value_type,value_len;
 355                         uint64_t value_num = 0;
 356                         char name[1024];
 357
 358                         name_len = get_le16(pb);
 359                         get_str16_nolen(pb, name_len, name, sizeof(name));
 360                         value_type = get_le16(pb);
 361                         value_len = get_le16(pb);
 362                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 363                         {
 364                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
 365                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
 366                                 else url_fskip(pb, value_len);
 367                         }
 368                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 369                         {
 370                                 value_num= get_value(pb, value_type);
 371                                 if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
 372                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
 373                         }
 374                 }
 375         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
 376             int n, stream_num, name_len, value_len, value_type, value_num;
 377             n = get_le16(pb);
 378
 379             for(i=0;i<n;i++) {
 380                 char name[1024];
 381
 382                 get_le16(pb); //lang_list_index
 383                 stream_num= get_le16(pb);
 384                 name_len=   get_le16(pb);
 385                 value_type= get_le16(pb);
 386                 value_len=  get_le32(pb);
 387
 388                 get_str16_nolen(pb, name_len, name, sizeof(name));
 389 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 390                 value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
 391                 url_fskip(pb, value_len - 2);
 392
 393                 if(stream_num<128){
 394                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 395                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 396                 }
 397             }
 398         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 399             int ext_len, payload_ext_ct, stream_ct;
 400             uint32_t ext_d;
 401             int64_t pos_ex_st;
 402             pos_ex_st = url_ftell(pb);
 403
 404             get_le64(pb); // starttime
 405             get_le64(pb); // endtime
 406             get_le32(pb); // leak-datarate
 407             get_le32(pb); // bucket-datasize
 408             get_le32(pb); // init-bucket-fullness
 409             get_le32(pb); // alt-leak-datarate
 410             get_le32(pb); // alt-bucket-datasize
 411             get_le32(pb); // alt-init-bucket-fullness
 412             get_le32(pb); // max-object-size
 413             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 414             get_le16(pb); // stream-num
 415             get_le16(pb); // stream-language-id-index
 416             get_le64(pb); // avg frametime in 100ns units
 417             stream_ct = get_le16(pb); //stream-name-count
 418             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 419
 420             for (i=0; i<stream_ct; i++){
 421                 get_le16(pb);
 422                 ext_len = get_le16(pb);
 423                 url_fseek(pb, ext_len, SEEK_CUR);
 424             }
 425
 426             for (i=0; i<payload_ext_ct; i++){
 427                 get_guid(pb, &g);
 428                 ext_d=get_le16(pb);
 429                 ext_len=get_le32(pb);
 430                 url_fseek(pb, ext_len, SEEK_CUR);
 431             }
 432
 433             // there could be a optional stream properties object to follow
 434             // if so the next iteration will pick it up
 435         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 436             int v1, v2;
 437             get_guid(pb, &g);
 438             v1 = get_le32(pb);
 439             v2 = get_le16(pb);
 440 #if 0
 441         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 442             int len, v1, n, num;
 443             char str[256], *q;
 444             char tag[16];
 445
 446             get_guid(pb, &g);
 447             print_guid(&g);
 448
 449             n = get_le32(pb);
 450             for(i=0;i<n;i++) {
 451                 num = get_le16(pb); /* stream number */
 452                 get_str16(pb, str, sizeof(str));
 453                 get_str16(pb, str, sizeof(str));
 454                 len = get_le16(pb);
 455                 q = tag;
 456                 while (len > 0) {
 457                     v1 = get_byte(pb);
 458                     if ((q - tag) < sizeof(tag) - 1)
 459                         *q++ = v1;
 460                     len--;
 461                 }
 462                 *q = '\0';
 463             }
 464 #endif
 465         } else if (url_feof(pb)) {
 466             goto fail;
 467         } else {
 468             url_fseek(pb, gsize - 24, SEEK_CUR);
 469         }
 470     }
 471     get_guid(pb, &g);
 472     get_le64(pb);
 473     get_byte(pb);
 474     get_byte(pb);
 475     if (url_feof(pb))
 476         goto fail;
 477     asf->data_offset = url_ftell(pb);
 478     asf->packet_size_left = 0;
 479
 480
 481     for(i=0; i<128; i++){
 482         int stream_num= asf->asfid2avid[i];
 483         if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){
 484             AVCodecContext *codec= s->streams[stream_num]->codec;
 485             av_reduce(&codec->sample_aspect_ratio.num,
 486                     &codec->sample_aspect_ratio.den,
 487                     dar[i].num, dar[i].den, INT_MAX);
 488 //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
 489         }
 490     }
 491
 492     return 0;
 493
 494  fail:
 495      for(i=0;i<s->nb_streams;i++) {
 496         AVStream *st = s->streams[i];
 497         if (st) {
 498             av_free(st->priv_data);
 499             av_free(st->codec->extradata);
 500         }
 501         av_free(st);
 502     }
 503     return -1;
 504 }
 505
 506 #define DO_2BITS(bits, var, defval) \
 507     switch (bits & 3) \
 508     { \
 509     case 3: var = get_le32(pb); rsize += 4; break; \
 510     case 2: var = get_le16(pb); rsize += 2; break; \
 511     case 1: var = get_byte(pb); rsize++; break; \
 512     default: var = defval; break; \
 513     }
 514
 515 /**
 516  *
 517  * @return <0 in case of an error
 518  */
 519 static int asf_get_packet(AVFormatContext *s)
 520 {
 521     ASFContext *asf = s->priv_data;
 522     ByteIOContext *pb = &s->pb;
 523     uint32_t packet_length, padsize;
 524     int rsize = 9;
 525     int c, d, e, off;
 526
 527     off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
 528
 529     c=d=e=-1;
 530     while(off-- > 0){
 531         c=d; d=e;
 532         e= get_byte(pb);
 533         if(c == 0x82 && !d && !e)
 534             break;
 535     }
 536
 537     if (c != 0x82) {
 538         if (!url_feof(pb))
 539             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 540     }
 541     if ((c & 0x0f) == 2) { // always true for now
 542         if (d || e) {
 543             if (!url_feof(pb))
 544                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 545             return -1;
 546         }
 547         d= get_byte(pb);
 548         e= get_byte(pb);
 549         rsize+=2;
 550 /*    }else{
 551         if (!url_feof(pb))
 552             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 553         return AVERROR_IO;*/
 554     }
 555
 556     asf->packet_flags = d;
 557     asf->packet_property = e;
 558
 559     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 560     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 561     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 562
 563     //the following checks prevent overflows and infinite loops
 564     if(packet_length >= (1U<<29)){
 565         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 566         return -1;
 567     }
 568     if(padsize >= packet_length){
 569         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 570         return -1;
 571     }
 572
 573     asf->packet_timestamp = get_le32(pb);
 574     get_le16(pb); /* duration */
 575     // rsize has at least 11 bytes which have to be present
 576
 577     if (asf->packet_flags & 0x01) {
 578         asf->packet_segsizetype = get_byte(pb); rsize++;
 579         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 580     } else {
 581         asf->packet_segments = 1;
 582         asf->packet_segsizetype = 0x80;
 583     }
 584     asf->packet_size_left = packet_length - padsize - rsize;
 585     if (packet_length < asf->hdr.min_pktsize)
 586         padsize += asf->hdr.min_pktsize - packet_length;
 587     asf->packet_padsize = padsize;
 588 #ifdef DEBUG
 589     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 590 #endif
 591     return 0;
 592 }
 593
 594 /**
 595  *
 596  * @return <0 if error
 597  */
 598 static int asf_read_frame_header(AVFormatContext *s){
 599     ASFContext *asf = s->priv_data;
 600     ByteIOContext *pb = &s->pb;
 601     int rsize = 1;
 602     int num = get_byte(pb);
 603     int64_t ts0, ts1;
 604
 605     asf->packet_segments--;
 606     asf->packet_key_frame = num >> 7;
 607     asf->stream_index = asf->asfid2avid[num & 0x7f];
 608     // sequence should be ignored!
 609     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 610     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 611     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 612 //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);
 613     if (asf->packet_replic_size >= 8) {
 614         asf->packet_obj_size = get_le32(pb);
 615         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 616             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 617             return -1;
 618         }
 619         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 620         if(asf->packet_replic_size >= 8+38+4){
 621 //            for(i=0; i<asf->packet_replic_size-8; i++)
 622 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 623 //            av_log(s, AV_LOG_DEBUG, "\n");
 624             url_fskip(pb, 10);
 625             ts0= get_le64(pb);
 626             ts1= get_le64(pb);
 627             url_fskip(pb, 12);
 628             get_le32(pb);
 629             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 630             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 631             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 632         }else
 633             url_fskip(pb, asf->packet_replic_size - 8);
 634         rsize += asf->packet_replic_size; // FIXME - check validity
 635     } else if (asf->packet_replic_size==1){
 636         // multipacket - frag_offset is begining timestamp
 637         asf->packet_time_start = asf->packet_frag_offset;
 638         asf->packet_frag_offset = 0;
 639         asf->packet_frag_timestamp = asf->packet_timestamp;
 640
 641         asf->packet_time_delta = get_byte(pb);
 642         rsize++;
 643     }else if(asf->packet_replic_size!=0){
 644         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 645         return -1;
 646     }
 647     if (asf->packet_flags & 0x01) {
 648         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 649         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 650             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 651             return -1;
 652         }
 653         //printf("Fragsize %d\n", asf->packet_frag_size);
 654     } else {
 655         asf->packet_frag_size = asf->packet_size_left - rsize;
 656         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 657     }
 658     if (asf->packet_replic_size == 1) {
 659         asf->packet_multi_size = asf->packet_frag_size;
 660         if (asf->packet_multi_size > asf->packet_size_left)
 661             return -1;
 662     }
 663     asf->packet_size_left -= rsize;
 664     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 665
 666     return 0;
 667 }
 668
 669 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 670 {
 671     ASFContext *asf = s->priv_data;
 672     ASFStream *asf_st = 0;
 673     ByteIOContext *pb = &s->pb;
 674     //static int pc = 0;
 675     for (;;) {
 676         if(url_feof(pb))
 677             return AVERROR_IO;
 678         if (asf->packet_size_left < FRAME_HEADER_SIZE
 679             || asf->packet_segments < 1) {
 680             //asf->packet_size_left <= asf->packet_padsize) {
 681             int ret = asf->packet_size_left + asf->packet_padsize;
 682             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 683             assert(ret>=0);
 684             /* fail safe */
 685             url_fskip(pb, ret);
 686
 687             asf->packet_pos= url_ftell(&s->pb);
 688             if (asf->data_object_size != (uint64_t)-1 &&
 689                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 690                 return AVERROR_IO; /* Do not exceed the size of the data object */
 691             ret = asf_get_packet(s);
 692             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 693             if (ret < 0)
 694                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 695             asf->packet_time_start = 0;
 696             continue;
 697         }
 698         if (asf->packet_time_start == 0) {
 699             if(asf_read_frame_header(s) < 0){
 700                 asf->packet_segments= 0;
 701                 continue;
 702             }
 703             if (asf->stream_index < 0
 704                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 705                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 706                 ) {
 707                 asf->packet_time_start = 0;
 708                 /* unhandled packet (should not happen) */
 709                 url_fskip(pb, asf->packet_frag_size);
 710                 asf->packet_size_left -= asf->packet_frag_size;
 711                 if(asf->stream_index < 0)
 712                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 713                 continue;
 714             }
 715             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 716         }
 717         asf_st = asf->asf_st;
 718
 719         if (asf->packet_replic_size == 1) {
 720             // frag_offset is here used as the begining timestamp
 721             asf->packet_frag_timestamp = asf->packet_time_start;
 722             asf->packet_time_start += asf->packet_time_delta;
 723             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 724             asf->packet_size_left--;
 725             asf->packet_multi_size--;
 726             if (asf->packet_multi_size < asf->packet_obj_size)
 727             {
 728                 asf->packet_time_start = 0;
 729                 url_fskip(pb, asf->packet_multi_size);
 730                 asf->packet_size_left -= asf->packet_multi_size;
 731                 continue;
 732             }
 733             asf->packet_multi_size -= asf->packet_obj_size;
 734             //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);
 735         }
 736         if (   asf_st->pkt.size != asf->packet_obj_size
 737             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 738             if(asf_st->pkt.data){
 739                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 740                 asf_st->frag_offset = 0;
 741                 av_free_packet(&asf_st->pkt);
 742             }
 743             /* new packet */
 744             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 745             asf_st->seq = asf->packet_seq;
 746             asf_st->pkt.pts = asf->packet_frag_timestamp;
 747             asf_st->pkt.stream_index = asf->stream_index;
 748             asf_st->pkt.pos =
 749             asf_st->packet_pos= asf->packet_pos;
 750 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 751 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 752 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 753             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 754                 asf->packet_key_frame = 1;
 755             if (asf->packet_key_frame)
 756                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 757         }
 758
 759         /* read data */
 760         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 761         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 762         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 763         asf->packet_size_left -= asf->packet_frag_size;
 764         if (asf->packet_size_left < 0)
 765             continue;
 766
 767         if(   asf->packet_frag_offset >= asf_st->pkt.size
 768            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 769             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 770                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 771             continue;
 772         }
 773
 774         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 775                    asf->packet_frag_size);
 776         asf_st->frag_offset += asf->packet_frag_size;
 777         /* test if whole packet is read */
 778         if (asf_st->frag_offset == asf_st->pkt.size) {
 779             /* return packet */
 780             if (asf_st->ds_span > 1) {
 781               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 782                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
 783               }else{
 784                 /* packet descrambling */
 785                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 786                 if (newdata) {
 787                     int offset = 0;
 788                     while (offset < asf_st->pkt.size) {
 789                         int off = offset / asf_st->ds_chunk_size;
 790                         int row = off / asf_st->ds_span;
 791                         int col = off % asf_st->ds_span;
 792                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 793                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 794
 795                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 796                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 797                         memcpy(newdata + offset,
 798                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 799                                asf_st->ds_chunk_size);
 800                         offset += asf_st->ds_chunk_size;
 801                     }
 802                     av_free(asf_st->pkt.data);
 803                     asf_st->pkt.data = newdata;
 804                 }
 805               }
 806             }
 807             asf_st->frag_offset = 0;
 808             *pkt= asf_st->pkt;
 809             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 810             asf_st->pkt.size = 0;
 811             asf_st->pkt.data = 0;
 812             break; // packet completed
 813         }
 814     }
 815     return 0;
 816 }
 817
 818 static int asf_read_close(AVFormatContext *s)
 819 {
 820     int i;
 821
 822     for(i=0;i<s->nb_streams;i++) {
 823         AVStream *st = s->streams[i];
 824         av_free(st->priv_data);
 825         av_free(st->codec->palctrl);
 826     }
 827     return 0;
 828 }
 829
 830 // Added to support seeking after packets have been read
 831 // If information is not reset, read_packet fails due to
 832 // leftover information from previous reads
 833 static void asf_reset_header(AVFormatContext *s)
 834 {
 835     ASFContext *asf = s->priv_data;
 836     ASFStream *asf_st;
 837     int i;
 838
 839     asf->packet_nb_frames = 0;
 840     asf->packet_size_left = 0;
 841     asf->packet_segments = 0;
 842     asf->packet_flags = 0;
 843     asf->packet_property = 0;
 844     asf->packet_timestamp = 0;
 845     asf->packet_segsizetype = 0;
 846     asf->packet_segments = 0;
 847     asf->packet_seq = 0;
 848     asf->packet_replic_size = 0;
 849     asf->packet_key_frame = 0;
 850     asf->packet_padsize = 0;
 851     asf->packet_frag_offset = 0;
 852     asf->packet_frag_size = 0;
 853     asf->packet_frag_timestamp = 0;
 854     asf->packet_multi_size = 0;
 855     asf->packet_obj_size = 0;
 856     asf->packet_time_delta = 0;
 857     asf->packet_time_start = 0;
 858
 859     for(i=0; i<s->nb_streams; i++){
 860         asf_st= s->streams[i]->priv_data;
 861         av_free_packet(&asf_st->pkt);
 862         asf_st->frag_offset=0;
 863         asf_st->seq=0;
 864     }
 865     asf->asf_st= NULL;
 866 }
 867
 868 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 869 {
 870     ASFContext *asf = s->priv_data;
 871     AVPacket pkt1, *pkt = &pkt1;
 872     ASFStream *asf_st;
 873     int64_t pts;
 874     int64_t pos= *ppos;
 875     int i;
 876     int64_t start_pos[s->nb_streams];
 877
 878     for(i=0; i<s->nb_streams; i++){
 879         start_pos[i]= pos;
 880     }
 881
 882     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 883     *ppos= pos;
 884     url_fseek(&s->pb, pos, SEEK_SET);
 885
 886 //printf("asf_read_pts\n");
 887     asf_reset_header(s);
 888     for(;;){
 889         if (av_read_frame(s, pkt) < 0){
 890             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 891             return AV_NOPTS_VALUE;
 892         }
 893
 894         pts= pkt->pts;
 895
 896         av_free_packet(pkt);
 897         if(pkt->flags&PKT_FLAG_KEY){
 898             i= pkt->stream_index;
 899
 900             asf_st= s->streams[i]->priv_data;
 901
 902 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 903             pos= asf_st->packet_pos;
 904
 905             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 906             start_pos[i]= asf_st->packet_pos + 1;
 907
 908             if(pkt->stream_index == stream_index)
 909                break;
 910         }
 911     }
 912
 913     *ppos= pos;
 914 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 915
 916     return pts;
 917 }
 918
 919 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 920 {
 921     GUID g;
 922     ASFContext *asf = s->priv_data;
 923     int64_t gsize, itime;
 924     int64_t pos, current_pos, index_pts;
 925     int i;
 926     int pct,ict;
 927
 928     current_pos = url_ftell(&s->pb);
 929
 930     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 931     get_guid(&s->pb, &g);
 932     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 933         gsize = get_le64(&s->pb);
 934         get_guid(&s->pb, &g);
 935         itime=get_le64(&s->pb);
 936         pct=get_le32(&s->pb);
 937         ict=get_le32(&s->pb);
 938         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
 939
 940         for (i=0;i<ict;i++){
 941             int pktnum=get_le32(&s->pb);
 942             int pktct =get_le16(&s->pb);
 943             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
 944
 945             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
 946             index_pts=av_rescale(itime, i, 10000);
 947
 948             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
 949         }
 950         asf->index_read= 1;
 951     }
 952     url_fseek(&s->pb, current_pos, SEEK_SET);
 953 }
 954
 955 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 956 {
 957     ASFContext *asf = s->priv_data;
 958     AVStream *st = s->streams[stream_index];
 959     int64_t pos;
 960     int index;
 961
 962     if (asf->packet_size <= 0)
 963         return -1;
 964
 965     if (!asf->index_read)
 966         asf_build_simple_index(s, stream_index);
 967
 968     if(!(asf->index_read && st->index_entries)){
 969         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
 970             return -1;
 971     }else{
 972         index= av_index_search_timestamp(st, pts, flags);
 973         if(index<0)
 974             return -1;
 975
 976         /* find the position */
 977         pos = st->index_entries[index].pos;
 978         pts = st->index_entries[index].timestamp;
 979
 980     // various attempts to find key frame have failed so far
 981     //    asf_reset_header(s);
 982     //    url_fseek(&s->pb, pos, SEEK_SET);
 983     //    key_pos = pos;
 984     //     for(i=0;i<16;i++){
 985     //         pos = url_ftell(&s->pb);
 986     //         if (av_read_frame(s, &pkt) < 0){
 987     //             av_log(s, AV_LOG_INFO, "seek failed\n");
 988     //             return -1;
 989     //         }
 990     //         asf_st = s->streams[stream_index]->priv_data;
 991     //         pos += st->parser->frame_offset;
 992     //
 993     //         if (pkt.size > b) {
 994     //             b = pkt.size;
 995     //             key_pos = pos;
 996     //         }
 997     //
 998     //         av_free_packet(&pkt);
 999     //     }
1000
1001         /* do the seek */
1002         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1003         url_fseek(&s->pb, pos, SEEK_SET);
1004     }
1005     asf_reset_header(s);
1006     return 0;
1007 }
1008
1009 AVInputFormat asf_demuxer = {
1010     "asf",
1011     "asf format",
1012     sizeof(ASFContext),
1013     asf_probe,
1014     asf_read_header,
1015     asf_read_packet,
1016     asf_read_close,
1017     asf_read_seek,
1018     asf_read_pts,
1019 };