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