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
  22 #include "libavutil/common.h"
  23 #include "libavcodec/mpegaudio.h"
  24 #include "avformat.h"
  25 #include "riff.h"
  26 #include "asf.h"
  27 #include "asfcrypt.h"
  28
  29 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  30
  31 #undef NDEBUG
  32 #include <assert.h>
  33
  34 #define FRAME_HEADER_SIZE 17
  35 // Fix Me! FRAME_HEADER_SIZE may be different.
  36
  37 static const GUID index_guid = {
  38     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  39 };
  40
  41 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
  42     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  43 };
  44 /**********************************/
  45 /* decoding */
  46
  47 //#define DEBUG
  48
  49 #ifdef DEBUG
  50 #define PRINT_IF_GUID(g,cmp) \
  51 if (!memcmp(g, &cmp, sizeof(GUID))) \
  52     dprintf(NULL, "(GUID: %s) ", #cmp)
  53
  54 static void print_guid(const GUID *g)
  55 {
  56     int i;
  57     PRINT_IF_GUID(g, asf_header);
  58     else PRINT_IF_GUID(g, file_header);
  59     else PRINT_IF_GUID(g, stream_header);
  60     else PRINT_IF_GUID(g, audio_stream);
  61     else PRINT_IF_GUID(g, audio_conceal_none);
  62     else PRINT_IF_GUID(g, video_stream);
  63     else PRINT_IF_GUID(g, video_conceal_none);
  64     else PRINT_IF_GUID(g, command_stream);
  65     else PRINT_IF_GUID(g, comment_header);
  66     else PRINT_IF_GUID(g, codec_comment_header);
  67     else PRINT_IF_GUID(g, codec_comment1_header);
  68     else PRINT_IF_GUID(g, data_header);
  69     else PRINT_IF_GUID(g, index_guid);
  70     else PRINT_IF_GUID(g, head1_guid);
  71     else PRINT_IF_GUID(g, head2_guid);
  72     else PRINT_IF_GUID(g, my_guid);
  73     else PRINT_IF_GUID(g, ext_stream_header);
  74     else PRINT_IF_GUID(g, extended_content_header);
  75     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  76     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  77     else PRINT_IF_GUID(g, metadata_header);
  78     else PRINT_IF_GUID(g, stream_bitrate_guid);
  79     else
  80         dprintf(NULL, "(GUID: unknown) ");
  81     for(i=0;i<16;i++)
  82         dprintf(NULL, " 0x%02x,", (*g)[i]);
  83     dprintf(NULL, "}\n");
  84 }
  85 #undef PRINT_IF_GUID
  86 #else
  87 #define print_guid(g)
  88 #endif
  89
  90 static void get_guid(ByteIOContext *s, GUID *g)
  91 {
  92     assert(sizeof(*g) == 16);
  93     get_buffer(s, *g, sizeof(*g));
  94 }
  95
  96 #if 0
  97 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  98 {
  99     int len, c;
 100     char *q;
 101
 102     len = get_le16(pb);
 103     q = buf;
 104     while (len > 0) {
 105         c = get_le16(pb);
 106         if ((q - buf) < buf_size - 1)
 107             *q++ = c;
 108         len--;
 109     }
 110     *q = '\0';
 111 }
 112 #endif
 113
 114 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 115 {
 116     char* q = buf;
 117     len /= 2;
 118     while (len--) {
 119         uint8_t tmp;
 120         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 121     }
 122     *q = '\0';
 123 }
 124
 125 static int asf_probe(AVProbeData *pd)
 126 {
 127     /* check file header */
 128     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
 129         return AVPROBE_SCORE_MAX;
 130     else
 131         return 0;
 132 }
 133
 134 static int get_value(ByteIOContext *pb, int type){
 135     switch(type){
 136         case 2: return get_le32(pb);
 137         case 3: return get_le32(pb);
 138         case 4: return get_le64(pb);
 139         case 5: return get_le16(pb);
 140         default:return INT_MIN;
 141     }
 142 }
 143
 144 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 145 {
 146     char value[1024];
 147     if (type <= 1) {         // unicode or byte
 148         get_str16_nolen(s->pb, len, value, sizeof(value));
 149     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
 150         uint64_t num = get_value(s->pb, type);
 151         snprintf(value, sizeof(value), "%"PRIu64, num);
 152     } else {
 153         url_fskip(s->pb, len);
 154         return;
 155     }
 156     if (strncmp(key, "WM/", 3))
 157         key += 3;
 158     av_metadata_set(&s->metadata, key, value);
 159 }
 160
 161 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 162 {
 163     ASFContext *asf = s->priv_data;
 164     GUID g;
 165     ByteIOContext *pb = s->pb;
 166     AVStream *st;
 167     ASFStream *asf_st;
 168     int size, i;
 169     int64_t gsize;
 170     AVRational dar[128];
 171     uint32_t bitrate[128];
 172
 173     memset(dar, 0, sizeof(dar));
 174     memset(bitrate, 0, sizeof(bitrate));
 175
 176     get_guid(pb, &g);
 177     if (memcmp(&g, &asf_header, sizeof(GUID)))
 178         return -1;
 179     get_le64(pb);
 180     get_le32(pb);
 181     get_byte(pb);
 182     get_byte(pb);
 183     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 184     for(;;) {
 185         get_guid(pb, &g);
 186         gsize = get_le64(pb);
 187         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
 188         print_guid(&g);
 189         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 190         if (!memcmp(&g, &data_header, sizeof(GUID))) {
 191             asf->data_object_offset = url_ftell(pb);
 192             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 193             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 194                 asf->data_object_size = gsize - 24;
 195             } else {
 196                 asf->data_object_size = (uint64_t)-1;
 197             }
 198             break;
 199         }
 200         if (gsize < 24)
 201             return -1;
 202         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 203             get_guid(pb, &asf->hdr.guid);
 204             asf->hdr.file_size          = get_le64(pb);
 205             asf->hdr.create_time        = get_le64(pb);
 206             asf->nb_packets             = get_le64(pb);
 207             asf->hdr.play_time          = get_le64(pb);
 208             asf->hdr.send_time          = get_le64(pb);
 209             asf->hdr.preroll            = get_le32(pb);
 210             asf->hdr.ignore             = get_le32(pb);
 211             asf->hdr.flags              = get_le32(pb);
 212             asf->hdr.min_pktsize        = get_le32(pb);
 213             asf->hdr.max_pktsize        = get_le32(pb);
 214             asf->hdr.max_bitrate        = get_le32(pb);
 215             asf->packet_size = asf->hdr.max_pktsize;
 216         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 217             enum CodecType type;
 218             int type_specific_size, sizeX;
 219             uint64_t total_size;
 220             unsigned int tag1;
 221             int64_t pos1, pos2, start_time;
 222             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 223
 224             pos1 = url_ftell(pb);
 225
 226             st = av_new_stream(s, 0);
 227             if (!st)
 228                 return AVERROR(ENOMEM);
 229             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 230             asf_st = av_mallocz(sizeof(ASFStream));
 231             if (!asf_st)
 232                 return AVERROR(ENOMEM);
 233             st->priv_data = asf_st;
 234             start_time = asf->hdr.preroll;
 235
 236             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 237                 st->duration = asf->hdr.send_time /
 238                     (10000000 / 1000) - start_time;
 239             }
 240             get_guid(pb, &g);
 241
 242             test_for_ext_stream_audio = 0;
 243             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 244                 type = CODEC_TYPE_AUDIO;
 245             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 246                 type = CODEC_TYPE_VIDEO;
 247             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 248                 type = CODEC_TYPE_DATA;
 249             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 250                 test_for_ext_stream_audio = 1;
 251                 type = CODEC_TYPE_UNKNOWN;
 252             } else {
 253                 return -1;
 254             }
 255             get_guid(pb, &g);
 256             total_size = get_le64(pb);
 257             type_specific_size = get_le32(pb);
 258             get_le32(pb);
 259             st->id = get_le16(pb) & 0x7f; /* stream id */
 260             // mapping of asf ID to AV stream ID;
 261             asf->asfid2avid[st->id] = s->nb_streams - 1;
 262
 263             get_le32(pb);
 264
 265             if (test_for_ext_stream_audio) {
 266                 get_guid(pb, &g);
 267                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 268                     type = CODEC_TYPE_AUDIO;
 269                     is_dvr_ms_audio=1;
 270                     get_guid(pb, &g);
 271                     get_le32(pb);
 272                     get_le32(pb);
 273                     get_le32(pb);
 274                     get_guid(pb, &g);
 275                     get_le32(pb);
 276                 }
 277             }
 278
 279             st->codec->codec_type = type;
 280             if (type == CODEC_TYPE_AUDIO) {
 281                 get_wav_header(pb, st->codec, type_specific_size);
 282                 if (is_dvr_ms_audio) {
 283                     // codec_id and codec_tag are unreliable in dvr_ms
 284                     // files. Set them later by probing stream.
 285                     st->codec->codec_id = CODEC_ID_PROBE;
 286                     st->codec->codec_tag = 0;
 287                 }
 288                 if (st->codec->codec_id == CODEC_ID_AAC) {
 289                     st->need_parsing = AVSTREAM_PARSE_NONE;
 290                 } else {
 291                     st->need_parsing = AVSTREAM_PARSE_FULL;
 292                 }
 293                 /* We have to init the frame size at some point .... */
 294                 pos2 = url_ftell(pb);
 295                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 296                     asf_st->ds_span = get_byte(pb);
 297                     asf_st->ds_packet_size = get_le16(pb);
 298                     asf_st->ds_chunk_size = get_le16(pb);
 299                     get_le16(pb); //ds_data_size
 300                     get_byte(pb); //ds_silence_data
 301                 }
 302                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 303                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 304                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 305                 if (asf_st->ds_span > 1) {
 306                     if (!asf_st->ds_chunk_size
 307                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 308                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 309                         asf_st->ds_span = 0; // disable descrambling
 310                 }
 311                 switch (st->codec->codec_id) {
 312                 case CODEC_ID_MP3:
 313                     st->codec->frame_size = MPA_FRAME_SIZE;
 314                     break;
 315                 case CODEC_ID_PCM_S16LE:
 316                 case CODEC_ID_PCM_S16BE:
 317                 case CODEC_ID_PCM_U16LE:
 318                 case CODEC_ID_PCM_U16BE:
 319                 case CODEC_ID_PCM_S8:
 320                 case CODEC_ID_PCM_U8:
 321                 case CODEC_ID_PCM_ALAW:
 322                 case CODEC_ID_PCM_MULAW:
 323                     st->codec->frame_size = 1;
 324                     break;
 325                 default:
 326                     /* This is probably wrong, but it prevents a crash later */
 327                     st->codec->frame_size = 1;
 328                     break;
 329                 }
 330             } else if (type == CODEC_TYPE_VIDEO) {
 331                 get_le32(pb);
 332                 get_le32(pb);
 333                 get_byte(pb);
 334                 size = get_le16(pb); /* size */
 335                 sizeX= get_le32(pb); /* size */
 336                 st->codec->width = get_le32(pb);
 337                 st->codec->height = get_le32(pb);
 338                 /* not available for asf */
 339                 get_le16(pb); /* panes */
 340                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 341                 tag1 = get_le32(pb);
 342                 url_fskip(pb, 20);
 343 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 344                 size= sizeX;
 345                 if (size > 40) {
 346                     st->codec->extradata_size = size - 40;
 347                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 348                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 349                 }
 350
 351         /* Extract palette from extradata if bpp <= 8 */
 352         /* This code assumes that extradata contains only palette */
 353         /* This is true for all paletted codecs implemented in ffmpeg */
 354         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 355             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 356 #ifdef WORDS_BIGENDIAN
 357             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 358                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 359 #else
 360             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 361                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 362 #endif
 363             st->codec->palctrl->palette_changed = 1;
 364         }
 365
 366                 st->codec->codec_tag = tag1;
 367                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 368                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 369                     st->need_parsing = AVSTREAM_PARSE_FULL;
 370             }
 371             pos2 = url_ftell(pb);
 372             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 373         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 374             int len1, len2, len3, len4, len5;
 375
 376             len1 = get_le16(pb);
 377             len2 = get_le16(pb);
 378             len3 = get_le16(pb);
 379             len4 = get_le16(pb);
 380             len5 = get_le16(pb);
 381             get_tag(s, "title"    , 0, len1);
 382             get_tag(s, "author"   , 0, len2);
 383             get_tag(s, "copyright", 0, len3);
 384             get_tag(s, "comment"  , 0, len4);
 385             url_fskip(pb, len5);
 386         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
 387             int stream_count = get_le16(pb);
 388             int j;
 389
 390 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 391 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 392             for(j = 0; j < stream_count; j++) {
 393                 int flags, bitrate, stream_id;
 394
 395                 flags= get_le16(pb);
 396                 bitrate= get_le32(pb);
 397                 stream_id= (flags & 0x7f);
 398 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 399                 asf->stream_bitrates[stream_id]= bitrate;
 400             }
 401        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 402                 int desc_count, i;
 403
 404                 desc_count = get_le16(pb);
 405                 for(i=0;i<desc_count;i++)
 406                 {
 407                         int name_len,value_type,value_len;
 408                         char name[1024];
 409
 410                         name_len = get_le16(pb);
 411                         get_str16_nolen(pb, name_len, name, sizeof(name));
 412                         value_type = get_le16(pb);
 413                         value_len = get_le16(pb);
 414                         get_tag(s, name, value_type, value_len);
 415                 }
 416         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
 417             int n, stream_num, name_len, value_len, value_type, value_num;
 418             n = get_le16(pb);
 419
 420             for(i=0;i<n;i++) {
 421                 char name[1024];
 422
 423                 get_le16(pb); //lang_list_index
 424                 stream_num= get_le16(pb);
 425                 name_len=   get_le16(pb);
 426                 value_type= get_le16(pb);
 427                 value_len=  get_le32(pb);
 428
 429                 get_str16_nolen(pb, name_len, name, sizeof(name));
 430 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 431                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 432                 url_fskip(pb, value_len - 2);
 433
 434                 if(stream_num<128){
 435                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 436                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 437                 }
 438             }
 439         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 440             int ext_len, payload_ext_ct, stream_ct;
 441             uint32_t ext_d, leak_rate, stream_num;
 442             int64_t pos_ex_st;
 443             pos_ex_st = url_ftell(pb);
 444
 445             get_le64(pb); // starttime
 446             get_le64(pb); // endtime
 447             leak_rate = get_le32(pb); // leak-datarate
 448             get_le32(pb); // bucket-datasize
 449             get_le32(pb); // init-bucket-fullness
 450             get_le32(pb); // alt-leak-datarate
 451             get_le32(pb); // alt-bucket-datasize
 452             get_le32(pb); // alt-init-bucket-fullness
 453             get_le32(pb); // max-object-size
 454             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 455             stream_num = get_le16(pb); // stream-num
 456             get_le16(pb); // stream-language-id-index
 457             get_le64(pb); // avg frametime in 100ns units
 458             stream_ct = get_le16(pb); //stream-name-count
 459             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 460
 461             if (stream_num < 128)
 462                 bitrate[stream_num] = leak_rate;
 463
 464             for (i=0; i<stream_ct; i++){
 465                 get_le16(pb);
 466                 ext_len = get_le16(pb);
 467                 url_fseek(pb, ext_len, SEEK_CUR);
 468             }
 469
 470             for (i=0; i<payload_ext_ct; i++){
 471                 get_guid(pb, &g);
 472                 ext_d=get_le16(pb);
 473                 ext_len=get_le32(pb);
 474                 url_fseek(pb, ext_len, SEEK_CUR);
 475             }
 476
 477             // there could be a optional stream properties object to follow
 478             // if so the next iteration will pick it up
 479         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 480             int v1, v2;
 481             get_guid(pb, &g);
 482             v1 = get_le32(pb);
 483             v2 = get_le16(pb);
 484 #if 0
 485         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 486             int len, v1, n, num;
 487             char str[256], *q;
 488             char tag[16];
 489
 490             get_guid(pb, &g);
 491             print_guid(&g);
 492
 493             n = get_le32(pb);
 494             for(i=0;i<n;i++) {
 495                 num = get_le16(pb); /* stream number */
 496                 get_str16(pb, str, sizeof(str));
 497                 get_str16(pb, str, sizeof(str));
 498                 len = get_le16(pb);
 499                 q = tag;
 500                 while (len > 0) {
 501                     v1 = get_byte(pb);
 502                     if ((q - tag) < sizeof(tag) - 1)
 503                         *q++ = v1;
 504                     len--;
 505                 }
 506                 *q = '\0';
 507             }
 508 #endif
 509         } else if (url_feof(pb)) {
 510             return -1;
 511         } else {
 512             url_fseek(pb, gsize - 24, SEEK_CUR);
 513         }
 514     }
 515     get_guid(pb, &g);
 516     get_le64(pb);
 517     get_byte(pb);
 518     get_byte(pb);
 519     if (url_feof(pb))
 520         return -1;
 521     asf->data_offset = url_ftell(pb);
 522     asf->packet_size_left = 0;
 523
 524
 525     for(i=0; i<128; i++){
 526         int stream_num= asf->asfid2avid[i];
 527         if(stream_num>=0){
 528             AVStream *st = s->streams[stream_num];
 529             if (!st->codec->bit_rate)
 530                 st->codec->bit_rate = bitrate[i];
 531             if (dar[i].num > 0 && dar[i].den > 0)
 532                 av_reduce(&st->sample_aspect_ratio.num,
 533                           &st->sample_aspect_ratio.den,
 534                           dar[i].num, dar[i].den, INT_MAX);
 535 //av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
 536         }
 537     }
 538
 539     return 0;
 540 }
 541
 542 #define DO_2BITS(bits, var, defval) \
 543     switch (bits & 3) \
 544     { \
 545     case 3: var = get_le32(pb); rsize += 4; break; \
 546     case 2: var = get_le16(pb); rsize += 2; break; \
 547     case 1: var = get_byte(pb); rsize++; break; \
 548     default: var = defval; break; \
 549     }
 550
 551 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 552 {
 553     ASFContext *asf = s->priv_data;
 554     uint32_t packet_length, padsize;
 555     int rsize = 8;
 556     int c, d, e, off;
 557
 558     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
 559
 560     c=d=e=-1;
 561     while(off-- > 0){
 562         c=d; d=e;
 563         e= get_byte(pb);
 564         if(c == 0x82 && !d && !e)
 565             break;
 566     }
 567
 568     if (c != 0x82) {
 569         if (!url_feof(pb))
 570             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 571     }
 572     if ((c & 0x8f) == 0x82) {
 573         if (d || e) {
 574             if (!url_feof(pb))
 575                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 576             return -1;
 577         }
 578         c= get_byte(pb);
 579         d= get_byte(pb);
 580         rsize+=3;
 581     }else{
 582         url_fseek(pb, -1, SEEK_CUR); //FIXME
 583     }
 584
 585     asf->packet_flags    = c;
 586     asf->packet_property = d;
 587
 588     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 589     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 590     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 591
 592     //the following checks prevent overflows and infinite loops
 593     if(packet_length >= (1U<<29)){
 594         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 595         return -1;
 596     }
 597     if(padsize >= packet_length){
 598         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 599         return -1;
 600     }
 601
 602     asf->packet_timestamp = get_le32(pb);
 603     get_le16(pb); /* duration */
 604     // rsize has at least 11 bytes which have to be present
 605
 606     if (asf->packet_flags & 0x01) {
 607         asf->packet_segsizetype = get_byte(pb); rsize++;
 608         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 609     } else {
 610         asf->packet_segments = 1;
 611         asf->packet_segsizetype = 0x80;
 612     }
 613     asf->packet_size_left = packet_length - padsize - rsize;
 614     if (packet_length < asf->hdr.min_pktsize)
 615         padsize += asf->hdr.min_pktsize - packet_length;
 616     asf->packet_padsize = padsize;
 617     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 618     return 0;
 619 }
 620
 621 /**
 622  *
 623  * @return <0 if error
 624  */
 625 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 626     ASFContext *asf = s->priv_data;
 627     int rsize = 1;
 628     int num = get_byte(pb);
 629     int64_t ts0, ts1;
 630
 631     asf->packet_segments--;
 632     asf->packet_key_frame = num >> 7;
 633     asf->stream_index = asf->asfid2avid[num & 0x7f];
 634     // sequence should be ignored!
 635     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 636     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 637     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 638 //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);
 639     if (asf->packet_replic_size >= 8) {
 640         asf->packet_obj_size = get_le32(pb);
 641         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 642             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 643             return -1;
 644         }
 645         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 646         if(asf->packet_replic_size >= 8+38+4){
 647 //            for(i=0; i<asf->packet_replic_size-8; i++)
 648 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 649 //            av_log(s, AV_LOG_DEBUG, "\n");
 650             url_fskip(pb, 10);
 651             ts0= get_le64(pb);
 652             ts1= get_le64(pb);
 653             url_fskip(pb, 12);
 654             get_le32(pb);
 655             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 656             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 657             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 658         }else
 659             url_fskip(pb, asf->packet_replic_size - 8);
 660         rsize += asf->packet_replic_size; // FIXME - check validity
 661     } else if (asf->packet_replic_size==1){
 662         // multipacket - frag_offset is beginning timestamp
 663         asf->packet_time_start = asf->packet_frag_offset;
 664         asf->packet_frag_offset = 0;
 665         asf->packet_frag_timestamp = asf->packet_timestamp;
 666
 667         asf->packet_time_delta = get_byte(pb);
 668         rsize++;
 669     }else if(asf->packet_replic_size!=0){
 670         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 671         return -1;
 672     }
 673     if (asf->packet_flags & 0x01) {
 674         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 675         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 676             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 677             return -1;
 678         }
 679         //printf("Fragsize %d\n", asf->packet_frag_size);
 680     } else {
 681         asf->packet_frag_size = asf->packet_size_left - rsize;
 682         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 683     }
 684     if (asf->packet_replic_size == 1) {
 685         asf->packet_multi_size = asf->packet_frag_size;
 686         if (asf->packet_multi_size > asf->packet_size_left)
 687             return -1;
 688     }
 689     asf->packet_size_left -= rsize;
 690     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 691
 692     return 0;
 693 }
 694
 695 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 696 {
 697     ASFContext *asf = s->priv_data;
 698     ASFStream *asf_st = 0;
 699     for (;;) {
 700         if(url_feof(pb))
 701             return AVERROR(EIO);
 702         if (asf->packet_size_left < FRAME_HEADER_SIZE
 703             || asf->packet_segments < 1) {
 704             //asf->packet_size_left <= asf->packet_padsize) {
 705             int ret = asf->packet_size_left + asf->packet_padsize;
 706             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 707             assert(ret>=0);
 708             /* fail safe */
 709             url_fskip(pb, ret);
 710
 711             asf->packet_pos= url_ftell(pb);
 712             if (asf->data_object_size != (uint64_t)-1 &&
 713                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 714                 return AVERROR(EIO); /* Do not exceed the size of the data object */
 715             return 1;
 716         }
 717         if (asf->packet_time_start == 0) {
 718             if(asf_read_frame_header(s, pb) < 0){
 719                 asf->packet_segments= 0;
 720                 continue;
 721             }
 722             if (asf->stream_index < 0
 723                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 724                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 725                 ) {
 726                 asf->packet_time_start = 0;
 727                 /* unhandled packet (should not happen) */
 728                 url_fskip(pb, asf->packet_frag_size);
 729                 asf->packet_size_left -= asf->packet_frag_size;
 730                 if(asf->stream_index < 0)
 731                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 732                 continue;
 733             }
 734             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 735         }
 736         asf_st = asf->asf_st;
 737
 738         if (asf->packet_replic_size == 1) {
 739             // frag_offset is here used as the beginning timestamp
 740             asf->packet_frag_timestamp = asf->packet_time_start;
 741             asf->packet_time_start += asf->packet_time_delta;
 742             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 743             asf->packet_size_left--;
 744             asf->packet_multi_size--;
 745             if (asf->packet_multi_size < asf->packet_obj_size)
 746             {
 747                 asf->packet_time_start = 0;
 748                 url_fskip(pb, asf->packet_multi_size);
 749                 asf->packet_size_left -= asf->packet_multi_size;
 750                 continue;
 751             }
 752             asf->packet_multi_size -= asf->packet_obj_size;
 753             //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);
 754         }
 755         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 756               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 757            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 758             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 759                 asf_st->frag_offset, asf->packet_frag_size,
 760                 asf->packet_obj_size, asf_st->pkt.size);
 761             asf->packet_obj_size= asf_st->pkt.size;
 762         }
 763
 764         if (   asf_st->pkt.size != asf->packet_obj_size
 765             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 766             if(asf_st->pkt.data){
 767                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 768                 asf_st->frag_offset = 0;
 769                 av_free_packet(&asf_st->pkt);
 770             }
 771             /* new packet */
 772             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 773             asf_st->seq = asf->packet_seq;
 774             asf_st->pkt.dts = asf->packet_frag_timestamp;
 775             asf_st->pkt.stream_index = asf->stream_index;
 776             asf_st->pkt.pos =
 777             asf_st->packet_pos= asf->packet_pos;
 778 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 779 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 780 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 781             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 782                 asf->packet_key_frame = 1;
 783             if (asf->packet_key_frame)
 784                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 785         }
 786
 787         /* read data */
 788         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 789         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 790         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 791         asf->packet_size_left -= asf->packet_frag_size;
 792         if (asf->packet_size_left < 0)
 793             continue;
 794
 795         if(   asf->packet_frag_offset >= asf_st->pkt.size
 796            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 797             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 798                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 799             continue;
 800         }
 801
 802         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 803                    asf->packet_frag_size);
 804         if (s->key && s->keylen == 20)
 805             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 806                             asf->packet_frag_size);
 807         asf_st->frag_offset += asf->packet_frag_size;
 808         /* test if whole packet is read */
 809         if (asf_st->frag_offset == asf_st->pkt.size) {
 810             //workaround for macroshit radio DVR-MS files
 811             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 812                && asf_st->pkt.size > 100){
 813                 int i;
 814                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 815                 if(i == asf_st->pkt.size){
 816                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 817                     asf_st->frag_offset = 0;
 818                     av_free_packet(&asf_st->pkt);
 819                     continue;
 820                 }
 821             }
 822
 823             /* return packet */
 824             if (asf_st->ds_span > 1) {
 825               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 826                     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);
 827               }else{
 828                 /* packet descrambling */
 829                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 830                 if (newdata) {
 831                     int offset = 0;
 832                     while (offset < asf_st->pkt.size) {
 833                         int off = offset / asf_st->ds_chunk_size;
 834                         int row = off / asf_st->ds_span;
 835                         int col = off % asf_st->ds_span;
 836                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 837                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 838
 839                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 840                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 841                         memcpy(newdata + offset,
 842                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 843                                asf_st->ds_chunk_size);
 844                         offset += asf_st->ds_chunk_size;
 845                     }
 846                     av_free(asf_st->pkt.data);
 847                     asf_st->pkt.data = newdata;
 848                 }
 849               }
 850             }
 851             asf_st->frag_offset = 0;
 852             *pkt= asf_st->pkt;
 853             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 854             asf_st->pkt.size = 0;
 855             asf_st->pkt.data = 0;
 856             break; // packet completed
 857         }
 858     }
 859     return 0;
 860 }
 861
 862 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 863 {
 864     ASFContext *asf = s->priv_data;
 865
 866     for (;;) {
 867         int ret;
 868
 869         /* parse cached packets, if any */
 870         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 871             return ret;
 872         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 873             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 874         asf->packet_time_start = 0;
 875     }
 876
 877     return 0;
 878 }
 879
 880 // Added to support seeking after packets have been read
 881 // If information is not reset, read_packet fails due to
 882 // leftover information from previous reads
 883 static void asf_reset_header(AVFormatContext *s)
 884 {
 885     ASFContext *asf = s->priv_data;
 886     ASFStream *asf_st;
 887     int i;
 888
 889     asf->packet_nb_frames = 0;
 890     asf->packet_size_left = 0;
 891     asf->packet_segments = 0;
 892     asf->packet_flags = 0;
 893     asf->packet_property = 0;
 894     asf->packet_timestamp = 0;
 895     asf->packet_segsizetype = 0;
 896     asf->packet_segments = 0;
 897     asf->packet_seq = 0;
 898     asf->packet_replic_size = 0;
 899     asf->packet_key_frame = 0;
 900     asf->packet_padsize = 0;
 901     asf->packet_frag_offset = 0;
 902     asf->packet_frag_size = 0;
 903     asf->packet_frag_timestamp = 0;
 904     asf->packet_multi_size = 0;
 905     asf->packet_obj_size = 0;
 906     asf->packet_time_delta = 0;
 907     asf->packet_time_start = 0;
 908
 909     for(i=0; i<s->nb_streams; i++){
 910         asf_st= s->streams[i]->priv_data;
 911         av_free_packet(&asf_st->pkt);
 912         asf_st->frag_offset=0;
 913         asf_st->seq=0;
 914     }
 915     asf->asf_st= NULL;
 916 }
 917
 918 static int asf_read_close(AVFormatContext *s)
 919 {
 920     int i;
 921
 922     asf_reset_header(s);
 923     for(i=0;i<s->nb_streams;i++) {
 924         AVStream *st = s->streams[i];
 925         av_free(st->codec->palctrl);
 926     }
 927     return 0;
 928 }
 929
 930 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 931 {
 932     ASFContext *asf = s->priv_data;
 933     AVPacket pkt1, *pkt = &pkt1;
 934     ASFStream *asf_st;
 935     int64_t pts;
 936     int64_t pos= *ppos;
 937     int i;
 938     int64_t start_pos[s->nb_streams];
 939
 940     for(i=0; i<s->nb_streams; i++){
 941         start_pos[i]= pos;
 942     }
 943
 944     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 945     *ppos= pos;
 946     url_fseek(s->pb, pos, SEEK_SET);
 947
 948 //printf("asf_read_pts\n");
 949     asf_reset_header(s);
 950     for(;;){
 951         if (av_read_frame(s, pkt) < 0){
 952             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 953             return AV_NOPTS_VALUE;
 954         }
 955
 956         pts= pkt->pts;
 957
 958         av_free_packet(pkt);
 959         if(pkt->flags&PKT_FLAG_KEY){
 960             i= pkt->stream_index;
 961
 962             asf_st= s->streams[i]->priv_data;
 963
 964 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 965             pos= asf_st->packet_pos;
 966
 967             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 968             start_pos[i]= asf_st->packet_pos + 1;
 969
 970             if(pkt->stream_index == stream_index)
 971                break;
 972         }
 973     }
 974
 975     *ppos= pos;
 976 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 977
 978     return pts;
 979 }
 980
 981 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 982 {
 983     GUID g;
 984     ASFContext *asf = s->priv_data;
 985     int64_t gsize, itime;
 986     int64_t pos, current_pos, index_pts;
 987     int i;
 988     int pct,ict;
 989
 990     current_pos = url_ftell(s->pb);
 991
 992     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 993     get_guid(s->pb, &g);
 994     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 995         gsize = get_le64(s->pb);
 996         get_guid(s->pb, &g);
 997         itime=get_le64(s->pb);
 998         pct=get_le32(s->pb);
 999         ict=get_le32(s->pb);
1000         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1001
1002         for (i=0;i<ict;i++){
1003             int pktnum=get_le32(s->pb);
1004             int pktct =get_le16(s->pb);
1005             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1006
1007             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1008             index_pts=av_rescale(itime, i, 10000);
1009
1010             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1011         }
1012         asf->index_read= 1;
1013     }
1014     url_fseek(s->pb, current_pos, SEEK_SET);
1015 }
1016
1017 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1018 {
1019     ASFContext *asf = s->priv_data;
1020     AVStream *st = s->streams[stream_index];
1021     int64_t pos;
1022     int index;
1023
1024     if (asf->packet_size <= 0)
1025         return -1;
1026
1027     /* Try using the protocol's read_seek if available */
1028     if(s->pb) {
1029         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1030         if(ret >= 0)
1031             asf_reset_header(s);
1032         if (ret != AVERROR(ENOSYS))
1033             return ret;
1034     }
1035
1036     if (!asf->index_read)
1037         asf_build_simple_index(s, stream_index);
1038
1039     if(!(asf->index_read && st->index_entries)){
1040         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1041             return -1;
1042     }else{
1043         index= av_index_search_timestamp(st, pts, flags);
1044         if(index<0)
1045             return -1;
1046
1047         /* find the position */
1048         pos = st->index_entries[index].pos;
1049         pts = st->index_entries[index].timestamp;
1050
1051     // various attempts to find key frame have failed so far
1052     //    asf_reset_header(s);
1053     //    url_fseek(s->pb, pos, SEEK_SET);
1054     //    key_pos = pos;
1055     //     for(i=0;i<16;i++){
1056     //         pos = url_ftell(s->pb);
1057     //         if (av_read_frame(s, &pkt) < 0){
1058     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1059     //             return -1;
1060     //         }
1061     //         asf_st = s->streams[stream_index]->priv_data;
1062     //         pos += st->parser->frame_offset;
1063     //
1064     //         if (pkt.size > b) {
1065     //             b = pkt.size;
1066     //             key_pos = pos;
1067     //         }
1068     //
1069     //         av_free_packet(&pkt);
1070     //     }
1071
1072         /* do the seek */
1073         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1074         url_fseek(s->pb, pos, SEEK_SET);
1075     }
1076     asf_reset_header(s);
1077     return 0;
1078 }
1079
1080 AVInputFormat asf_demuxer = {
1081     "asf",
1082     NULL_IF_CONFIG_SMALL("ASF format"),
1083     sizeof(ASFContext),
1084     asf_probe,
1085     asf_read_header,
1086     asf_read_packet,
1087     asf_read_close,
1088     asf_read_seek,
1089     asf_read_pts,
1090 };