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 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
  38     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  39 };
  40 /**********************************/
  41 /* decoding */
  42
  43 //#define DEBUG
  44
  45 #ifdef DEBUG
  46 #define PRINT_IF_GUID(g,cmp) \
  47 if (!memcmp(g, &cmp, sizeof(GUID))) \
  48     printf("(GUID: %s) ", #cmp)
  49
  50 static void print_guid(const GUID *g)
  51 {
  52     int i;
  53     PRINT_IF_GUID(g, asf_header);
  54     else PRINT_IF_GUID(g, file_header);
  55     else PRINT_IF_GUID(g, stream_header);
  56     else PRINT_IF_GUID(g, audio_stream);
  57     else PRINT_IF_GUID(g, audio_conceal_none);
  58     else PRINT_IF_GUID(g, video_stream);
  59     else PRINT_IF_GUID(g, video_conceal_none);
  60     else PRINT_IF_GUID(g, command_stream);
  61     else PRINT_IF_GUID(g, comment_header);
  62     else PRINT_IF_GUID(g, codec_comment_header);
  63     else PRINT_IF_GUID(g, codec_comment1_header);
  64     else PRINT_IF_GUID(g, data_header);
  65     else PRINT_IF_GUID(g, index_guid);
  66     else PRINT_IF_GUID(g, head1_guid);
  67     else PRINT_IF_GUID(g, head2_guid);
  68     else PRINT_IF_GUID(g, my_guid);
  69     else PRINT_IF_GUID(g, ext_stream_header);
  70     else PRINT_IF_GUID(g, extended_content_header);
  71     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  72     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  73     else PRINT_IF_GUID(g, metadata_header);
  74     else PRINT_IF_GUID(g, stream_bitrate_guid);
  75     else
  76         printf("(GUID: unknown) ");
  77     for(i=0;i<16;i++)
  78         printf(" 0x%02x,", (*g)[i]);
  79     printf("}\n");
  80 }
  81 #undef PRINT_IF_GUID
  82 #endif
  83
  84 static void get_guid(ByteIOContext *s, GUID *g)
  85 {
  86     assert(sizeof(*g) == 16);
  87     get_buffer(s, g, sizeof(*g));
  88 }
  89
  90 #if 0
  91 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  92 {
  93     int len, c;
  94     char *q;
  95
  96     len = get_le16(pb);
  97     q = buf;
  98     while (len > 0) {
  99         c = get_le16(pb);
 100         if ((q - buf) < buf_size - 1)
 101             *q++ = c;
 102         len--;
 103     }
 104     *q = '\0';
 105 }
 106 #endif
 107
 108 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 109 {
 110     char* q = buf;
 111     len /= 2;
 112     while (len--) {
 113         uint8_t tmp;
 114         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 115     }
 116     *q = '\0';
 117 }
 118
 119 static int asf_probe(AVProbeData *pd)
 120 {
 121     /* check file header */
 122     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
 123         return AVPROBE_SCORE_MAX;
 124     else
 125         return 0;
 126 }
 127
 128 static int get_value(ByteIOContext *pb, int type){
 129     switch(type){
 130         case 2: return get_le32(pb);
 131         case 3: return get_le32(pb);
 132         case 4: return get_le64(pb);
 133         case 5: return get_le16(pb);
 134         default:return INT_MIN;
 135     }
 136 }
 137
 138 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 139 {
 140     ASFContext *asf = s->priv_data;
 141     GUID g;
 142     ByteIOContext *pb = &s->pb;
 143     AVStream *st;
 144     ASFStream *asf_st;
 145     int size, i;
 146     int64_t gsize;
 147     AVRational dar[128];
 148     uint32_t bitrate[128];
 149
 150     memset(dar, 0, sizeof(dar));
 151     memset(bitrate, 0, sizeof(bitrate));
 152
 153     get_guid(pb, &g);
 154     if (memcmp(&g, &asf_header, sizeof(GUID)))
 155         goto fail;
 156     get_le64(pb);
 157     get_le32(pb);
 158     get_byte(pb);
 159     get_byte(pb);
 160     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 161     for(;;) {
 162         get_guid(pb, &g);
 163         gsize = get_le64(pb);
 164 #ifdef DEBUG
 165         printf("%08"PRIx64": ", url_ftell(pb) - 24);
 166         print_guid(&g);
 167         printf("  size=0x%"PRIx64"\n", gsize);
 168 #endif
 169         if (!memcmp(&g, &data_header, sizeof(GUID))) {
 170             asf->data_object_offset = url_ftell(pb);
 171             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 172             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 173                 asf->data_object_size = gsize - 24;
 174             } else {
 175                 asf->data_object_size = (uint64_t)-1;
 176             }
 177             break;
 178         }
 179         if (gsize < 24)
 180             goto fail;
 181         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 182             get_guid(pb, &asf->hdr.guid);
 183             asf->hdr.file_size          = get_le64(pb);
 184             asf->hdr.create_time        = get_le64(pb);
 185             asf->nb_packets             = get_le64(pb);
 186             asf->hdr.send_time          = get_le64(pb);
 187             asf->hdr.play_time          = get_le64(pb);
 188             asf->hdr.preroll            = get_le32(pb);
 189             asf->hdr.ignore             = get_le32(pb);
 190             asf->hdr.flags              = get_le32(pb);
 191             asf->hdr.min_pktsize        = get_le32(pb);
 192             asf->hdr.max_pktsize        = get_le32(pb);
 193             asf->hdr.max_bitrate        = get_le32(pb);
 194             asf->packet_size = asf->hdr.max_pktsize;
 195         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 196             int type, type_specific_size, sizeX;
 197             uint64_t total_size;
 198             unsigned int tag1;
 199             int64_t pos1, pos2, start_time;
 200             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 201
 202             pos1 = url_ftell(pb);
 203
 204             st = av_new_stream(s, 0);
 205             if (!st)
 206                 goto fail;
 207             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 208             asf_st = av_mallocz(sizeof(ASFStream));
 209             if (!asf_st)
 210                 goto fail;
 211             st->priv_data = asf_st;
 212             start_time = asf->hdr.preroll;
 213
 214             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 215                 st->duration = asf->hdr.send_time /
 216                     (10000000 / 1000) - start_time;
 217             }
 218             get_guid(pb, &g);
 219
 220             test_for_ext_stream_audio = 0;
 221             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 222                 type = CODEC_TYPE_AUDIO;
 223             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 224                 type = CODEC_TYPE_VIDEO;
 225             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 226                 type = CODEC_TYPE_UNKNOWN;
 227             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 228                 test_for_ext_stream_audio = 1;
 229                 type = CODEC_TYPE_UNKNOWN;
 230             } else {
 231                 goto fail;
 232             }
 233             get_guid(pb, &g);
 234             total_size = get_le64(pb);
 235             type_specific_size = get_le32(pb);
 236             get_le32(pb);
 237             st->id = get_le16(pb) & 0x7f; /* stream id */
 238             // mapping of asf ID to AV stream ID;
 239             asf->asfid2avid[st->id] = s->nb_streams - 1;
 240
 241             get_le32(pb);
 242
 243             if (test_for_ext_stream_audio) {
 244                 get_guid(pb, &g);
 245                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 246                     type = CODEC_TYPE_AUDIO;
 247                     is_dvr_ms_audio=1;
 248                     get_guid(pb, &g);
 249                     get_le32(pb);
 250                     get_le32(pb);
 251                     get_le32(pb);
 252                     get_guid(pb, &g);
 253                     get_le32(pb);
 254                 }
 255             }
 256
 257             st->codec->codec_type = type;
 258             if (type == CODEC_TYPE_AUDIO) {
 259                 get_wav_header(pb, st->codec, type_specific_size);
 260                 if (is_dvr_ms_audio) {
 261                     // codec_id and codec_tag are unreliable in dvr_ms
 262                     // files. Set them later by probing stream.
 263                     st->codec->codec_id = CODEC_ID_NONE;
 264                     st->codec->codec_tag = 0;
 265                 }
 266                 st->need_parsing = AVSTREAM_PARSE_FULL;
 267                 /* We have to init the frame size at some point .... */
 268                 pos2 = url_ftell(pb);
 269                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 270                     asf_st->ds_span = get_byte(pb);
 271                     asf_st->ds_packet_size = get_le16(pb);
 272                     asf_st->ds_chunk_size = get_le16(pb);
 273                     get_le16(pb); //ds_data_size
 274                     get_byte(pb); //ds_silence_data
 275                 }
 276                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 277                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 278                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 279                 if (asf_st->ds_span > 1) {
 280                     if (!asf_st->ds_chunk_size
 281                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 282                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 283                         asf_st->ds_span = 0; // disable descrambling
 284                 }
 285                 switch (st->codec->codec_id) {
 286                 case CODEC_ID_MP3:
 287                     st->codec->frame_size = MPA_FRAME_SIZE;
 288                     break;
 289                 case CODEC_ID_PCM_S16LE:
 290                 case CODEC_ID_PCM_S16BE:
 291                 case CODEC_ID_PCM_U16LE:
 292                 case CODEC_ID_PCM_U16BE:
 293                 case CODEC_ID_PCM_S8:
 294                 case CODEC_ID_PCM_U8:
 295                 case CODEC_ID_PCM_ALAW:
 296                 case CODEC_ID_PCM_MULAW:
 297                     st->codec->frame_size = 1;
 298                     break;
 299                 default:
 300                     /* This is probably wrong, but it prevents a crash later */
 301                     st->codec->frame_size = 1;
 302                     break;
 303                 }
 304             } else if (type == CODEC_TYPE_VIDEO) {
 305                 get_le32(pb);
 306                 get_le32(pb);
 307                 get_byte(pb);
 308                 size = get_le16(pb); /* size */
 309                 sizeX= get_le32(pb); /* size */
 310                 st->codec->width = get_le32(pb);
 311                 st->codec->height = get_le32(pb);
 312                 /* not available for asf */
 313                 get_le16(pb); /* panes */
 314                 st->codec->bits_per_sample = get_le16(pb); /* depth */
 315                 tag1 = get_le32(pb);
 316                 url_fskip(pb, 20);
 317 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 318                 size= sizeX;
 319                 if (size > 40) {
 320                     st->codec->extradata_size = size - 40;
 321                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 322                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 323                 }
 324
 325         /* Extract palette from extradata if bpp <= 8 */
 326         /* This code assumes that extradata contains only palette */
 327         /* This is true for all paletted codecs implemented in ffmpeg */
 328         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
 329             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 330 #ifdef WORDS_BIGENDIAN
 331             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 332                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 333 #else
 334             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 335                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 336 #endif
 337             st->codec->palctrl->palette_changed = 1;
 338         }
 339
 340                 st->codec->codec_tag = tag1;
 341                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 342                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 343                     st->need_parsing = AVSTREAM_PARSE_FULL;
 344             }
 345             pos2 = url_ftell(pb);
 346             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 347         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 348             int len1, len2, len3, len4, len5;
 349
 350             len1 = get_le16(pb);
 351             len2 = get_le16(pb);
 352             len3 = get_le16(pb);
 353             len4 = get_le16(pb);
 354             len5 = get_le16(pb);
 355             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
 356             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
 357             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 358             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
 359             url_fskip(pb, len5);
 360         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
 361             int stream_count = get_le16(pb);
 362             int j;
 363
 364 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
 365 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
 366             for(j = 0; j < stream_count; j++) {
 367                 int flags, bitrate, stream_id;
 368
 369                 flags= get_le16(pb);
 370                 bitrate= get_le32(pb);
 371                 stream_id= (flags & 0x7f);
 372 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 373                 asf->stream_bitrates[stream_id]= bitrate;
 374             }
 375        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 376                 int desc_count, i;
 377
 378                 desc_count = get_le16(pb);
 379                 for(i=0;i<desc_count;i++)
 380                 {
 381                         int name_len,value_type,value_len;
 382                         uint64_t value_num = 0;
 383                         char name[1024];
 384
 385                         name_len = get_le16(pb);
 386                         get_str16_nolen(pb, name_len, name, sizeof(name));
 387                         value_type = get_le16(pb);
 388                         value_len = get_le16(pb);
 389                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 390                         {
 391                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
 392                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
 393                                 else if(!strcmp(name,"WM/Track") && s->track == 0) {
 394                                     char track[8];
 395                                     get_str16_nolen(pb, value_len, track, sizeof(track));
 396                                     s->track = strtol(track, NULL, 10) + 1;
 397                                 }
 398                                 else if(!strcmp(name,"WM/TrackNumber")) {
 399                                     char track[8];
 400                                     get_str16_nolen(pb, value_len, track, sizeof(track));
 401                                     s->track = strtol(track, NULL, 10);
 402                                 }
 403                                 else url_fskip(pb, value_len);
 404                         }
 405                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 406                         {
 407                                 value_num= get_value(pb, value_type);
 408                                 if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
 409                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
 410                         }
 411                 }
 412         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
 413             int n, stream_num, name_len, value_len, value_type, value_num;
 414             n = get_le16(pb);
 415
 416             for(i=0;i<n;i++) {
 417                 char name[1024];
 418
 419                 get_le16(pb); //lang_list_index
 420                 stream_num= get_le16(pb);
 421                 name_len=   get_le16(pb);
 422                 value_type= get_le16(pb);
 423                 value_len=  get_le32(pb);
 424
 425                 get_str16_nolen(pb, name_len, name, sizeof(name));
 426 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 427                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 428                 url_fskip(pb, value_len - 2);
 429
 430                 if(stream_num<128){
 431                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 432                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 433                 }
 434             }
 435         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 436             int ext_len, payload_ext_ct, stream_ct;
 437             uint32_t ext_d, leak_rate, stream_num;
 438             int64_t pos_ex_st;
 439             pos_ex_st = url_ftell(pb);
 440
 441             get_le64(pb); // starttime
 442             get_le64(pb); // endtime
 443             leak_rate = get_le32(pb); // leak-datarate
 444             get_le32(pb); // bucket-datasize
 445             get_le32(pb); // init-bucket-fullness
 446             get_le32(pb); // alt-leak-datarate
 447             get_le32(pb); // alt-bucket-datasize
 448             get_le32(pb); // alt-init-bucket-fullness
 449             get_le32(pb); // max-object-size
 450             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 451             stream_num = get_le16(pb); // stream-num
 452             get_le16(pb); // stream-language-id-index
 453             get_le64(pb); // avg frametime in 100ns units
 454             stream_ct = get_le16(pb); //stream-name-count
 455             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 456
 457             if (stream_num < 128)
 458                 bitrate[stream_num] = leak_rate;
 459
 460             for (i=0; i<stream_ct; i++){
 461                 get_le16(pb);
 462                 ext_len = get_le16(pb);
 463                 url_fseek(pb, ext_len, SEEK_CUR);
 464             }
 465
 466             for (i=0; i<payload_ext_ct; i++){
 467                 get_guid(pb, &g);
 468                 ext_d=get_le16(pb);
 469                 ext_len=get_le32(pb);
 470                 url_fseek(pb, ext_len, SEEK_CUR);
 471             }
 472
 473             // there could be a optional stream properties object to follow
 474             // if so the next iteration will pick it up
 475         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 476             int v1, v2;
 477             get_guid(pb, &g);
 478             v1 = get_le32(pb);
 479             v2 = get_le16(pb);
 480 #if 0
 481         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 482             int len, v1, n, num;
 483             char str[256], *q;
 484             char tag[16];
 485
 486             get_guid(pb, &g);
 487             print_guid(&g);
 488
 489             n = get_le32(pb);
 490             for(i=0;i<n;i++) {
 491                 num = get_le16(pb); /* stream number */
 492                 get_str16(pb, str, sizeof(str));
 493                 get_str16(pb, str, sizeof(str));
 494                 len = get_le16(pb);
 495                 q = tag;
 496                 while (len > 0) {
 497                     v1 = get_byte(pb);
 498                     if ((q - tag) < sizeof(tag) - 1)
 499                         *q++ = v1;
 500                     len--;
 501                 }
 502                 *q = '\0';
 503             }
 504 #endif
 505         } else if (url_feof(pb)) {
 506             goto fail;
 507         } else {
 508             url_fseek(pb, gsize - 24, SEEK_CUR);
 509         }
 510     }
 511     get_guid(pb, &g);
 512     get_le64(pb);
 513     get_byte(pb);
 514     get_byte(pb);
 515     if (url_feof(pb))
 516         goto fail;
 517     asf->data_offset = url_ftell(pb);
 518     asf->packet_size_left = 0;
 519
 520
 521     for(i=0; i<128; i++){
 522         int stream_num= asf->asfid2avid[i];
 523         if(stream_num>=0){
 524             AVCodecContext *codec= s->streams[stream_num]->codec;
 525             if (!codec->bit_rate)
 526                 codec->bit_rate = bitrate[i];
 527             if (dar[i].num > 0 && dar[i].den > 0)
 528                 av_reduce(&codec->sample_aspect_ratio.num,
 529                           &codec->sample_aspect_ratio.den,
 530                           dar[i].num, dar[i].den, INT_MAX);
 531 //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);
 532         }
 533     }
 534
 535     return 0;
 536
 537  fail:
 538      for(i=0;i<s->nb_streams;i++) {
 539         AVStream *st = s->streams[i];
 540         if (st) {
 541             av_free(st->priv_data);
 542             av_free(st->codec->extradata);
 543         }
 544         av_free(st);
 545     }
 546     return -1;
 547 }
 548
 549 #define DO_2BITS(bits, var, defval) \
 550     switch (bits & 3) \
 551     { \
 552     case 3: var = get_le32(pb); rsize += 4; break; \
 553     case 2: var = get_le16(pb); rsize += 2; break; \
 554     case 1: var = get_byte(pb); rsize++; break; \
 555     default: var = defval; break; \
 556     }
 557
 558 /**
 559  *
 560  * @return <0 in case of an error
 561  */
 562 static int asf_get_packet(AVFormatContext *s)
 563 {
 564     ASFContext *asf = s->priv_data;
 565     ByteIOContext *pb = &s->pb;
 566     uint32_t packet_length, padsize;
 567     int rsize = 8;
 568     int c, d, e, off;
 569
 570     off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
 571
 572     c=d=e=-1;
 573     while(off-- > 0){
 574         c=d; d=e;
 575         e= get_byte(pb);
 576         if(c == 0x82 && !d && !e)
 577             break;
 578     }
 579
 580     if (c != 0x82) {
 581         if (!url_feof(pb))
 582             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 583     }
 584     if ((c & 0x8f) == 0x82) {
 585         if (d || e) {
 586             if (!url_feof(pb))
 587                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 588             return -1;
 589         }
 590         c= get_byte(pb);
 591         d= get_byte(pb);
 592         rsize+=3;
 593     }else{
 594         url_fseek(pb, -1, SEEK_CUR); //FIXME
 595     }
 596
 597     asf->packet_flags    = c;
 598     asf->packet_property = d;
 599
 600     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 601     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 602     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 603
 604     //the following checks prevent overflows and infinite loops
 605     if(packet_length >= (1U<<29)){
 606         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 607         return -1;
 608     }
 609     if(padsize >= packet_length){
 610         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 611         return -1;
 612     }
 613
 614     asf->packet_timestamp = get_le32(pb);
 615     get_le16(pb); /* duration */
 616     // rsize has at least 11 bytes which have to be present
 617
 618     if (asf->packet_flags & 0x01) {
 619         asf->packet_segsizetype = get_byte(pb); rsize++;
 620         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 621     } else {
 622         asf->packet_segments = 1;
 623         asf->packet_segsizetype = 0x80;
 624     }
 625     asf->packet_size_left = packet_length - padsize - rsize;
 626     if (packet_length < asf->hdr.min_pktsize)
 627         padsize += asf->hdr.min_pktsize - packet_length;
 628     asf->packet_padsize = padsize;
 629 #ifdef DEBUG
 630     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 631 #endif
 632     return 0;
 633 }
 634
 635 /**
 636  *
 637  * @return <0 if error
 638  */
 639 static int asf_read_frame_header(AVFormatContext *s){
 640     ASFContext *asf = s->priv_data;
 641     ByteIOContext *pb = &s->pb;
 642     int rsize = 1;
 643     int num = get_byte(pb);
 644     int64_t ts0, ts1;
 645
 646     asf->packet_segments--;
 647     asf->packet_key_frame = num >> 7;
 648     asf->stream_index = asf->asfid2avid[num & 0x7f];
 649     // sequence should be ignored!
 650     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 651     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 652     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 653 //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);
 654     if (asf->packet_replic_size >= 8) {
 655         asf->packet_obj_size = get_le32(pb);
 656         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 657             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 658             return -1;
 659         }
 660         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 661         if(asf->packet_replic_size >= 8+38+4){
 662 //            for(i=0; i<asf->packet_replic_size-8; i++)
 663 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 664 //            av_log(s, AV_LOG_DEBUG, "\n");
 665             url_fskip(pb, 10);
 666             ts0= get_le64(pb);
 667             ts1= get_le64(pb);
 668             url_fskip(pb, 12);
 669             get_le32(pb);
 670             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 671             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 672             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 673         }else
 674             url_fskip(pb, asf->packet_replic_size - 8);
 675         rsize += asf->packet_replic_size; // FIXME - check validity
 676     } else if (asf->packet_replic_size==1){
 677         // multipacket - frag_offset is begining timestamp
 678         asf->packet_time_start = asf->packet_frag_offset;
 679         asf->packet_frag_offset = 0;
 680         asf->packet_frag_timestamp = asf->packet_timestamp;
 681
 682         asf->packet_time_delta = get_byte(pb);
 683         rsize++;
 684     }else if(asf->packet_replic_size!=0){
 685         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 686         return -1;
 687     }
 688     if (asf->packet_flags & 0x01) {
 689         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 690         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 691             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 692             return -1;
 693         }
 694         //printf("Fragsize %d\n", asf->packet_frag_size);
 695     } else {
 696         asf->packet_frag_size = asf->packet_size_left - rsize;
 697         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 698     }
 699     if (asf->packet_replic_size == 1) {
 700         asf->packet_multi_size = asf->packet_frag_size;
 701         if (asf->packet_multi_size > asf->packet_size_left)
 702             return -1;
 703     }
 704     asf->packet_size_left -= rsize;
 705     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 706
 707     return 0;
 708 }
 709
 710 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 711 {
 712     ASFContext *asf = s->priv_data;
 713     ASFStream *asf_st = 0;
 714     ByteIOContext *pb = &s->pb;
 715     //static int pc = 0;
 716     for (;;) {
 717         if(url_feof(pb))
 718             return AVERROR(EIO);
 719         if (asf->packet_size_left < FRAME_HEADER_SIZE
 720             || asf->packet_segments < 1) {
 721             //asf->packet_size_left <= asf->packet_padsize) {
 722             int ret = asf->packet_size_left + asf->packet_padsize;
 723             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 724             assert(ret>=0);
 725             /* fail safe */
 726             url_fskip(pb, ret);
 727
 728             asf->packet_pos= url_ftell(&s->pb);
 729             if (asf->data_object_size != (uint64_t)-1 &&
 730                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 731                 return AVERROR(EIO); /* Do not exceed the size of the data object */
 732             ret = asf_get_packet(s);
 733             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 734             if (ret < 0)
 735                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 736             asf->packet_time_start = 0;
 737             continue;
 738         }
 739         if (asf->packet_time_start == 0) {
 740             if(asf_read_frame_header(s) < 0){
 741                 asf->packet_segments= 0;
 742                 continue;
 743             }
 744             if (asf->stream_index < 0
 745                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 746                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 747                 ) {
 748                 asf->packet_time_start = 0;
 749                 /* unhandled packet (should not happen) */
 750                 url_fskip(pb, asf->packet_frag_size);
 751                 asf->packet_size_left -= asf->packet_frag_size;
 752                 if(asf->stream_index < 0)
 753                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 754                 continue;
 755             }
 756             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 757         }
 758         asf_st = asf->asf_st;
 759
 760         if (asf->packet_replic_size == 1) {
 761             // frag_offset is here used as the begining timestamp
 762             asf->packet_frag_timestamp = asf->packet_time_start;
 763             asf->packet_time_start += asf->packet_time_delta;
 764             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 765             asf->packet_size_left--;
 766             asf->packet_multi_size--;
 767             if (asf->packet_multi_size < asf->packet_obj_size)
 768             {
 769                 asf->packet_time_start = 0;
 770                 url_fskip(pb, asf->packet_multi_size);
 771                 asf->packet_size_left -= asf->packet_multi_size;
 772                 continue;
 773             }
 774             asf->packet_multi_size -= asf->packet_obj_size;
 775             //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);
 776         }
 777         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 778               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 779            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 780             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 781                 asf_st->frag_offset, asf->packet_frag_size,
 782                 asf->packet_obj_size, asf_st->pkt.size);
 783             asf->packet_obj_size= asf_st->pkt.size;
 784         }
 785
 786         if (   asf_st->pkt.size != asf->packet_obj_size
 787             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 788             if(asf_st->pkt.data){
 789                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 790                 asf_st->frag_offset = 0;
 791                 av_free_packet(&asf_st->pkt);
 792             }
 793             /* new packet */
 794             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 795             asf_st->seq = asf->packet_seq;
 796             asf_st->pkt.pts = asf->packet_frag_timestamp;
 797             asf_st->pkt.stream_index = asf->stream_index;
 798             asf_st->pkt.pos =
 799             asf_st->packet_pos= asf->packet_pos;
 800 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 801 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 802 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 803             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 804                 asf->packet_key_frame = 1;
 805             if (asf->packet_key_frame)
 806                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 807         }
 808
 809         /* read data */
 810         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 811         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 812         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 813         asf->packet_size_left -= asf->packet_frag_size;
 814         if (asf->packet_size_left < 0)
 815             continue;
 816
 817         if(   asf->packet_frag_offset >= asf_st->pkt.size
 818            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 819             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 820                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 821             continue;
 822         }
 823
 824         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 825                    asf->packet_frag_size);
 826         asf_st->frag_offset += asf->packet_frag_size;
 827         /* test if whole packet is read */
 828         if (asf_st->frag_offset == asf_st->pkt.size) {
 829             //workaround for macroshit radio DVR-MS files
 830             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 831                && asf_st->pkt.size > 100){
 832                 int i;
 833                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 834                 if(i == asf_st->pkt.size){
 835                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 836                     asf_st->frag_offset = 0;
 837                     av_free_packet(&asf_st->pkt);
 838                     continue;
 839                 }
 840             }
 841
 842             /* return packet */
 843             if (asf_st->ds_span > 1) {
 844               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 845                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
 846               }else{
 847                 /* packet descrambling */
 848                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 849                 if (newdata) {
 850                     int offset = 0;
 851                     while (offset < asf_st->pkt.size) {
 852                         int off = offset / asf_st->ds_chunk_size;
 853                         int row = off / asf_st->ds_span;
 854                         int col = off % asf_st->ds_span;
 855                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 856                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 857
 858                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 859                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 860                         memcpy(newdata + offset,
 861                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 862                                asf_st->ds_chunk_size);
 863                         offset += asf_st->ds_chunk_size;
 864                     }
 865                     av_free(asf_st->pkt.data);
 866                     asf_st->pkt.data = newdata;
 867                 }
 868               }
 869             }
 870             asf_st->frag_offset = 0;
 871             *pkt= asf_st->pkt;
 872             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 873             asf_st->pkt.size = 0;
 874             asf_st->pkt.data = 0;
 875             break; // packet completed
 876         }
 877     }
 878     return 0;
 879 }
 880
 881 static int asf_read_close(AVFormatContext *s)
 882 {
 883     int i;
 884
 885     for(i=0;i<s->nb_streams;i++) {
 886         AVStream *st = s->streams[i];
 887         av_free(st->priv_data);
 888         av_free(st->codec->palctrl);
 889     }
 890     return 0;
 891 }
 892
 893 // Added to support seeking after packets have been read
 894 // If information is not reset, read_packet fails due to
 895 // leftover information from previous reads
 896 static void asf_reset_header(AVFormatContext *s)
 897 {
 898     ASFContext *asf = s->priv_data;
 899     ASFStream *asf_st;
 900     int i;
 901
 902     asf->packet_nb_frames = 0;
 903     asf->packet_size_left = 0;
 904     asf->packet_segments = 0;
 905     asf->packet_flags = 0;
 906     asf->packet_property = 0;
 907     asf->packet_timestamp = 0;
 908     asf->packet_segsizetype = 0;
 909     asf->packet_segments = 0;
 910     asf->packet_seq = 0;
 911     asf->packet_replic_size = 0;
 912     asf->packet_key_frame = 0;
 913     asf->packet_padsize = 0;
 914     asf->packet_frag_offset = 0;
 915     asf->packet_frag_size = 0;
 916     asf->packet_frag_timestamp = 0;
 917     asf->packet_multi_size = 0;
 918     asf->packet_obj_size = 0;
 919     asf->packet_time_delta = 0;
 920     asf->packet_time_start = 0;
 921
 922     for(i=0; i<s->nb_streams; i++){
 923         asf_st= s->streams[i]->priv_data;
 924         av_free_packet(&asf_st->pkt);
 925         asf_st->frag_offset=0;
 926         asf_st->seq=0;
 927     }
 928     asf->asf_st= NULL;
 929 }
 930
 931 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 932 {
 933     ASFContext *asf = s->priv_data;
 934     AVPacket pkt1, *pkt = &pkt1;
 935     ASFStream *asf_st;
 936     int64_t pts;
 937     int64_t pos= *ppos;
 938     int i;
 939     int64_t start_pos[s->nb_streams];
 940
 941     for(i=0; i<s->nb_streams; i++){
 942         start_pos[i]= pos;
 943     }
 944
 945     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 946     *ppos= pos;
 947     url_fseek(&s->pb, pos, SEEK_SET);
 948
 949 //printf("asf_read_pts\n");
 950     asf_reset_header(s);
 951     for(;;){
 952         if (av_read_frame(s, pkt) < 0){
 953             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 954             return AV_NOPTS_VALUE;
 955         }
 956
 957         pts= pkt->pts;
 958
 959         av_free_packet(pkt);
 960         if(pkt->flags&PKT_FLAG_KEY){
 961             i= pkt->stream_index;
 962
 963             asf_st= s->streams[i]->priv_data;
 964
 965 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 966             pos= asf_st->packet_pos;
 967
 968             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 969             start_pos[i]= asf_st->packet_pos + 1;
 970
 971             if(pkt->stream_index == stream_index)
 972                break;
 973         }
 974     }
 975
 976     *ppos= pos;
 977 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 978
 979     return pts;
 980 }
 981
 982 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 983 {
 984     GUID g;
 985     ASFContext *asf = s->priv_data;
 986     int64_t gsize, itime;
 987     int64_t pos, current_pos, index_pts;
 988     int i;
 989     int pct,ict;
 990
 991     current_pos = url_ftell(&s->pb);
 992
 993     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 994     get_guid(&s->pb, &g);
 995     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 996         gsize = get_le64(&s->pb);
 997         get_guid(&s->pb, &g);
 998         itime=get_le64(&s->pb);
 999         pct=get_le32(&s->pb);
1000         ict=get_le32(&s->pb);
1001         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1002
1003         for (i=0;i<ict;i++){
1004             int pktnum=get_le32(&s->pb);
1005             int pktct =get_le16(&s->pb);
1006             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1007
1008             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1009             index_pts=av_rescale(itime, i, 10000);
1010
1011             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1012         }
1013         asf->index_read= 1;
1014     }
1015     url_fseek(&s->pb, current_pos, SEEK_SET);
1016 }
1017
1018 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1019 {
1020     ASFContext *asf = s->priv_data;
1021     AVStream *st = s->streams[stream_index];
1022     int64_t pos;
1023     int index;
1024
1025     if (asf->packet_size <= 0)
1026         return -1;
1027
1028     if (!asf->index_read)
1029         asf_build_simple_index(s, stream_index);
1030
1031     if(!(asf->index_read && st->index_entries)){
1032         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1033             return -1;
1034     }else{
1035         index= av_index_search_timestamp(st, pts, flags);
1036         if(index<0)
1037             return -1;
1038
1039         /* find the position */
1040         pos = st->index_entries[index].pos;
1041         pts = st->index_entries[index].timestamp;
1042
1043     // various attempts to find key frame have failed so far
1044     //    asf_reset_header(s);
1045     //    url_fseek(&s->pb, pos, SEEK_SET);
1046     //    key_pos = pos;
1047     //     for(i=0;i<16;i++){
1048     //         pos = url_ftell(&s->pb);
1049     //         if (av_read_frame(s, &pkt) < 0){
1050     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1051     //             return -1;
1052     //         }
1053     //         asf_st = s->streams[stream_index]->priv_data;
1054     //         pos += st->parser->frame_offset;
1055     //
1056     //         if (pkt.size > b) {
1057     //             b = pkt.size;
1058     //             key_pos = pos;
1059     //         }
1060     //
1061     //         av_free_packet(&pkt);
1062     //     }
1063
1064         /* do the seek */
1065         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1066         url_fseek(&s->pb, pos, SEEK_SET);
1067     }
1068     asf_reset_header(s);
1069     return 0;
1070 }
1071
1072 AVInputFormat asf_demuxer = {
1073     "asf",
1074     "asf format",
1075     sizeof(ASFContext),
1076     asf_probe,
1077     asf_read_header,
1078     asf_read_packet,
1079     asf_read_close,
1080     asf_read_seek,
1081     asf_read_pts,
1082 };