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