libavformat/asfdec.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 ff_asf_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 ff_asf_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 (!guidcmp(g, &cmp)) \
  52     dprintf(NULL, "(GUID: %s) ", #cmp)
  53
  54 static void print_guid(const ff_asf_guid *g)
  55 {
  56     int i;
  57     PRINT_IF_GUID(g, ff_asf_header);
  58     else PRINT_IF_GUID(g, ff_asf_file_header);
  59     else PRINT_IF_GUID(g, ff_asf_stream_header);
  60     else PRINT_IF_GUID(g, ff_asf_audio_stream);
  61     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
  62     else PRINT_IF_GUID(g, ff_asf_video_stream);
  63     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
  64     else PRINT_IF_GUID(g, ff_asf_command_stream);
  65     else PRINT_IF_GUID(g, ff_asf_comment_header);
  66     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
  67     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
  68     else PRINT_IF_GUID(g, ff_asf_data_header);
  69     else PRINT_IF_GUID(g, index_guid);
  70     else PRINT_IF_GUID(g, ff_asf_head1_guid);
  71     else PRINT_IF_GUID(g, ff_asf_head2_guid);
  72     else PRINT_IF_GUID(g, ff_asf_my_guid);
  73     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
  74     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
  75     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
  76     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
  77     else PRINT_IF_GUID(g, ff_asf_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 int guidcmp(const void *g1, const void *g2)
  91 {
  92     return memcmp(g1, g2, sizeof(ff_asf_guid));
  93 }
  94
  95 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
  96 {
  97     assert(sizeof(*g) == 16);
  98     get_buffer(s, *g, sizeof(*g));
  99 }
 100
 101 #if 0
 102 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
 103 {
 104     int len, c;
 105     char *q;
 106
 107     len = get_le16(pb);
 108     q = buf;
 109     while (len > 0) {
 110         c = get_le16(pb);
 111         if ((q - buf) < buf_size - 1)
 112             *q++ = c;
 113         len--;
 114     }
 115     *q = '\0';
 116 }
 117 #endif
 118
 119 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 120 {
 121     char* q = buf;
 122     len /= 2;
 123     while (len--) {
 124         uint8_t tmp;
 125         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 126     }
 127     *q = '\0';
 128 }
 129
 130 static int asf_probe(AVProbeData *pd)
 131 {
 132     /* check file header */
 133     if (!guidcmp(pd->buf, &ff_asf_header))
 134         return AVPROBE_SCORE_MAX;
 135     else
 136         return 0;
 137 }
 138
 139 static int get_value(ByteIOContext *pb, int type){
 140     switch(type){
 141         case 2: return get_le32(pb);
 142         case 3: return get_le32(pb);
 143         case 4: return get_le64(pb);
 144         case 5: return get_le16(pb);
 145         default:return INT_MIN;
 146     }
 147 }
 148
 149 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 150 {
 151     char value[1024];
 152     if (type <= 1) {         // unicode or byte
 153         get_str16_nolen(s->pb, len, value, sizeof(value));
 154     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
 155         uint64_t num = get_value(s->pb, type);
 156         snprintf(value, sizeof(value), "%"PRIu64, num);
 157     } else {
 158         url_fskip(s->pb, len);
 159         return;
 160     }
 161     if (!strncmp(key, "WM/", 3))
 162         key += 3;
 163     av_metadata_set(&s->metadata, key, value);
 164 }
 165
 166 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 167 {
 168     ASFContext *asf = s->priv_data;
 169     ff_asf_guid g;
 170     ByteIOContext *pb = s->pb;
 171     AVStream *st;
 172     ASFStream *asf_st;
 173     int size, i;
 174     int64_t gsize;
 175     AVRational dar[128];
 176     uint32_t bitrate[128];
 177
 178     memset(dar, 0, sizeof(dar));
 179     memset(bitrate, 0, sizeof(bitrate));
 180
 181     get_guid(pb, &g);
 182     if (guidcmp(&g, &ff_asf_header))
 183         return -1;
 184     get_le64(pb);
 185     get_le32(pb);
 186     get_byte(pb);
 187     get_byte(pb);
 188     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 189     for(;;) {
 190         get_guid(pb, &g);
 191         gsize = get_le64(pb);
 192         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
 193         print_guid(&g);
 194         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 195         if (!guidcmp(&g, &ff_asf_data_header)) {
 196             asf->data_object_offset = url_ftell(pb);
 197             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 198             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 199                 asf->data_object_size = gsize - 24;
 200             } else {
 201                 asf->data_object_size = (uint64_t)-1;
 202             }
 203             break;
 204         }
 205         if (gsize < 24)
 206             return -1;
 207         if (!guidcmp(&g, &ff_asf_file_header)) {
 208             get_guid(pb, &asf->hdr.guid);
 209             asf->hdr.file_size          = get_le64(pb);
 210             asf->hdr.create_time        = get_le64(pb);
 211             asf->nb_packets             = get_le64(pb);
 212             asf->hdr.play_time          = get_le64(pb);
 213             asf->hdr.send_time          = get_le64(pb);
 214             asf->hdr.preroll            = get_le32(pb);
 215             asf->hdr.ignore             = get_le32(pb);
 216             asf->hdr.flags              = get_le32(pb);
 217             asf->hdr.min_pktsize        = get_le32(pb);
 218             asf->hdr.max_pktsize        = get_le32(pb);
 219             asf->hdr.max_bitrate        = get_le32(pb);
 220             asf->packet_size = asf->hdr.max_pktsize;
 221         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
 222             enum CodecType type;
 223             int type_specific_size, sizeX;
 224             uint64_t total_size;
 225             unsigned int tag1;
 226             int64_t pos1, pos2, start_time;
 227             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 228
 229             pos1 = url_ftell(pb);
 230
 231             st = av_new_stream(s, 0);
 232             if (!st)
 233                 return AVERROR(ENOMEM);
 234             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 235             asf_st = av_mallocz(sizeof(ASFStream));
 236             if (!asf_st)
 237                 return AVERROR(ENOMEM);
 238             st->priv_data = asf_st;
 239             start_time = asf->hdr.preroll;
 240
 241             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 242                 st->duration = asf->hdr.send_time /
 243                     (10000000 / 1000) - start_time;
 244             }
 245             get_guid(pb, &g);
 246
 247             test_for_ext_stream_audio = 0;
 248             if (!guidcmp(&g, &ff_asf_audio_stream)) {
 249                 type = CODEC_TYPE_AUDIO;
 250             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
 251                 type = CODEC_TYPE_VIDEO;
 252             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
 253                 type = CODEC_TYPE_DATA;
 254             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 255                 test_for_ext_stream_audio = 1;
 256                 type = CODEC_TYPE_UNKNOWN;
 257             } else {
 258                 return -1;
 259             }
 260             get_guid(pb, &g);
 261             total_size = get_le64(pb);
 262             type_specific_size = get_le32(pb);
 263             get_le32(pb);
 264             st->id = get_le16(pb) & 0x7f; /* stream id */
 265             // mapping of asf ID to AV stream ID;
 266             asf->asfid2avid[st->id] = s->nb_streams - 1;
 267
 268             get_le32(pb);
 269
 270             if (test_for_ext_stream_audio) {
 271                 get_guid(pb, &g);
 272                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 273                     type = CODEC_TYPE_AUDIO;
 274                     is_dvr_ms_audio=1;
 275                     get_guid(pb, &g);
 276                     get_le32(pb);
 277                     get_le32(pb);
 278                     get_le32(pb);
 279                     get_guid(pb, &g);
 280                     get_le32(pb);
 281                 }
 282             }
 283
 284             st->codec->codec_type = type;
 285             if (type == CODEC_TYPE_AUDIO) {
 286                 get_wav_header(pb, st->codec, type_specific_size);
 287                 if (is_dvr_ms_audio) {
 288                     // codec_id and codec_tag are unreliable in dvr_ms
 289                     // files. Set them later by probing stream.
 290                     st->codec->codec_id = CODEC_ID_PROBE;
 291                     st->codec->codec_tag = 0;
 292                 }
 293                 if (st->codec->codec_id == CODEC_ID_AAC) {
 294                     st->need_parsing = AVSTREAM_PARSE_NONE;
 295                 } else {
 296                     st->need_parsing = AVSTREAM_PARSE_FULL;
 297                 }
 298                 /* We have to init the frame size at some point .... */
 299                 pos2 = url_ftell(pb);
 300                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 301                     asf_st->ds_span = get_byte(pb);
 302                     asf_st->ds_packet_size = get_le16(pb);
 303                     asf_st->ds_chunk_size = get_le16(pb);
 304                     get_le16(pb); //ds_data_size
 305                     get_byte(pb); //ds_silence_data
 306                 }
 307                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 308                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 309                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 310                 if (asf_st->ds_span > 1) {
 311                     if (!asf_st->ds_chunk_size
 312                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 313                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 314                         asf_st->ds_span = 0; // disable descrambling
 315                 }
 316                 switch (st->codec->codec_id) {
 317                 case CODEC_ID_MP3:
 318                     st->codec->frame_size = MPA_FRAME_SIZE;
 319                     break;
 320                 case CODEC_ID_PCM_S16LE:
 321                 case CODEC_ID_PCM_S16BE:
 322                 case CODEC_ID_PCM_U16LE:
 323                 case CODEC_ID_PCM_U16BE:
 324                 case CODEC_ID_PCM_S8:
 325                 case CODEC_ID_PCM_U8:
 326                 case CODEC_ID_PCM_ALAW:
 327                 case CODEC_ID_PCM_MULAW:
 328                     st->codec->frame_size = 1;
 329                     break;
 330                 default:
 331                     /* This is probably wrong, but it prevents a crash later */
 332                     st->codec->frame_size = 1;
 333                     break;
 334                 }
 335             } else if (type == CODEC_TYPE_VIDEO) {
 336                 get_le32(pb);
 337                 get_le32(pb);
 338                 get_byte(pb);
 339                 size = get_le16(pb); /* size */
 340                 sizeX= get_le32(pb); /* size */
 341                 st->codec->width = get_le32(pb);
 342                 st->codec->height = get_le32(pb);
 343                 /* not available for asf */
 344                 get_le16(pb); /* panes */
 345                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 346                 tag1 = get_le32(pb);
 347                 url_fskip(pb, 20);
 348 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 349                 size= sizeX;
 350                 if (size > 40) {
 351                     st->codec->extradata_size = size - 40;
 352                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 353                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 354                 }
 355
 356                 /* Extract palette from extradata if bpp <= 8 */
 357                 /* This code assumes that extradata contains only palette */
 358                 /* This is true for all paletted codecs implemented in ffmpeg */
 359                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 360                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 361 #ifdef WORDS_BIGENDIAN
 362                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 363                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 364 #else
 365                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 366                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 367 #endif
 368                     st->codec->palctrl->palette_changed = 1;
 369                 }
 370
 371                 st->codec->codec_tag = tag1;
 372                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 373                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 374                     st->need_parsing = AVSTREAM_PARSE_FULL;
 375             }
 376             pos2 = url_ftell(pb);
 377             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 378         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
 379             int len1, len2, len3, len4, len5;
 380
 381             len1 = get_le16(pb);
 382             len2 = get_le16(pb);
 383             len3 = get_le16(pb);
 384             len4 = get_le16(pb);
 385             len5 = get_le16(pb);
 386             get_tag(s, "title"    , 0, len1);
 387             get_tag(s, "author"   , 0, len2);
 388             get_tag(s, "copyright", 0, len3);
 389             get_tag(s, "comment"  , 0, len4);
 390             url_fskip(pb, len5);
 391         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
 392             int stream_count = get_le16(pb);
 393             int j;
 394
 395 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 396 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 397             for(j = 0; j < stream_count; j++) {
 398                 int flags, bitrate, stream_id;
 399
 400                 flags= get_le16(pb);
 401                 bitrate= get_le32(pb);
 402                 stream_id= (flags & 0x7f);
 403 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 404                 asf->stream_bitrates[stream_id]= bitrate;
 405             }
 406         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
 407             int desc_count, i;
 408
 409             desc_count = get_le16(pb);
 410             for(i=0;i<desc_count;i++) {
 411                     int name_len,value_type,value_len;
 412                     char name[1024];
 413
 414                     name_len = get_le16(pb);
 415                     get_str16_nolen(pb, name_len, name, sizeof(name));
 416                     value_type = get_le16(pb);
 417                     value_len  = get_le16(pb);
 418                     get_tag(s, name, value_type, value_len);
 419             }
 420         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
 421             int n, stream_num, name_len, value_len, value_type, value_num;
 422             n = get_le16(pb);
 423
 424             for(i=0;i<n;i++) {
 425                 char name[1024];
 426
 427                 get_le16(pb); //lang_list_index
 428                 stream_num= get_le16(pb);
 429                 name_len=   get_le16(pb);
 430                 value_type= get_le16(pb);
 431                 value_len=  get_le32(pb);
 432
 433                 get_str16_nolen(pb, name_len, name, sizeof(name));
 434 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 435                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 436                 url_fskip(pb, value_len - 2);
 437
 438                 if(stream_num<128){
 439                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 440                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 441                 }
 442             }
 443         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
 444             int ext_len, payload_ext_ct, stream_ct;
 445             uint32_t ext_d, leak_rate, stream_num;
 446
 447             get_le64(pb); // starttime
 448             get_le64(pb); // endtime
 449             leak_rate = get_le32(pb); // leak-datarate
 450             get_le32(pb); // bucket-datasize
 451             get_le32(pb); // init-bucket-fullness
 452             get_le32(pb); // alt-leak-datarate
 453             get_le32(pb); // alt-bucket-datasize
 454             get_le32(pb); // alt-init-bucket-fullness
 455             get_le32(pb); // max-object-size
 456             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 457             stream_num = get_le16(pb); // stream-num
 458             get_le16(pb); // stream-language-id-index
 459             get_le64(pb); // avg frametime in 100ns units
 460             stream_ct = get_le16(pb); //stream-name-count
 461             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 462
 463             if (stream_num < 128)
 464                 bitrate[stream_num] = leak_rate;
 465
 466             for (i=0; i<stream_ct; i++){
 467                 get_le16(pb);
 468                 ext_len = get_le16(pb);
 469                 url_fseek(pb, ext_len, SEEK_CUR);
 470             }
 471
 472             for (i=0; i<payload_ext_ct; i++){
 473                 get_guid(pb, &g);
 474                 ext_d=get_le16(pb);
 475                 ext_len=get_le32(pb);
 476                 url_fseek(pb, ext_len, SEEK_CUR);
 477             }
 478
 479             // there could be a optional stream properties object to follow
 480             // if so the next iteration will pick it up
 481         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
 482             int v1, v2;
 483             get_guid(pb, &g);
 484             v1 = get_le32(pb);
 485             v2 = get_le16(pb);
 486 #if 0
 487         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
 488             int len, v1, n, num;
 489             char str[256], *q;
 490             char tag[16];
 491
 492             get_guid(pb, &g);
 493             print_guid(&g);
 494
 495             n = get_le32(pb);
 496             for(i=0;i<n;i++) {
 497                 num = get_le16(pb); /* stream number */
 498                 get_str16(pb, str, sizeof(str));
 499                 get_str16(pb, str, sizeof(str));
 500                 len = get_le16(pb);
 501                 q = tag;
 502                 while (len > 0) {
 503                     v1 = get_byte(pb);
 504                     if ((q - tag) < sizeof(tag) - 1)
 505                         *q++ = v1;
 506                     len--;
 507                 }
 508                 *q = '\0';
 509             }
 510 #endif
 511         } else if (url_feof(pb)) {
 512             return -1;
 513         } else {
 514             url_fseek(pb, gsize - 24, SEEK_CUR);
 515         }
 516     }
 517     get_guid(pb, &g);
 518     get_le64(pb);
 519     get_byte(pb);
 520     get_byte(pb);
 521     if (url_feof(pb))
 522         return -1;
 523     asf->data_offset = url_ftell(pb);
 524     asf->packet_size_left = 0;
 525
 526
 527     for(i=0; i<128; i++){
 528         int stream_num= asf->asfid2avid[i];
 529         if(stream_num>=0){
 530             AVStream *st = s->streams[stream_num];
 531             if (!st->codec->bit_rate)
 532                 st->codec->bit_rate = bitrate[i];
 533             if (dar[i].num > 0 && dar[i].den > 0)
 534                 av_reduce(&st->sample_aspect_ratio.num,
 535                           &st->sample_aspect_ratio.den,
 536                           dar[i].num, dar[i].den, INT_MAX);
 537 //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);
 538         }
 539     }
 540
 541     return 0;
 542 }
 543
 544 #define DO_2BITS(bits, var, defval) \
 545     switch (bits & 3) \
 546     { \
 547     case 3: var = get_le32(pb); rsize += 4; break; \
 548     case 2: var = get_le16(pb); rsize += 2; break; \
 549     case 1: var = get_byte(pb); rsize++; break; \
 550     default: var = defval; break; \
 551     }
 552
 553 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 554 {
 555     ASFContext *asf = s->priv_data;
 556     uint32_t packet_length, padsize;
 557     int rsize = 8;
 558     int c, d, e, off;
 559
 560     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
 561
 562     c=d=e=-1;
 563     while(off-- > 0){
 564         c=d; d=e;
 565         e= get_byte(pb);
 566         if(c == 0x82 && !d && !e)
 567             break;
 568     }
 569
 570     if (c != 0x82) {
 571         if (!url_feof(pb))
 572             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 573     }
 574     if ((c & 0x8f) == 0x82) {
 575         if (d || e) {
 576             if (!url_feof(pb))
 577                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 578             return -1;
 579         }
 580         c= get_byte(pb);
 581         d= get_byte(pb);
 582         rsize+=3;
 583     }else{
 584         url_fseek(pb, -1, SEEK_CUR); //FIXME
 585     }
 586
 587     asf->packet_flags    = c;
 588     asf->packet_property = d;
 589
 590     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 591     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 592     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 593
 594     //the following checks prevent overflows and infinite loops
 595     if(packet_length >= (1U<<29)){
 596         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 597         return -1;
 598     }
 599     if(padsize >= packet_length){
 600         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 601         return -1;
 602     }
 603
 604     asf->packet_timestamp = get_le32(pb);
 605     get_le16(pb); /* duration */
 606     // rsize has at least 11 bytes which have to be present
 607
 608     if (asf->packet_flags & 0x01) {
 609         asf->packet_segsizetype = get_byte(pb); rsize++;
 610         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 611     } else {
 612         asf->packet_segments = 1;
 613         asf->packet_segsizetype = 0x80;
 614     }
 615     asf->packet_size_left = packet_length - padsize - rsize;
 616     if (packet_length < asf->hdr.min_pktsize)
 617         padsize += asf->hdr.min_pktsize - packet_length;
 618     asf->packet_padsize = padsize;
 619     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 620     return 0;
 621 }
 622
 623 /**
 624  *
 625  * @return <0 if error
 626  */
 627 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 628     ASFContext *asf = s->priv_data;
 629     int rsize = 1;
 630     int num = get_byte(pb);
 631     int64_t ts0, ts1;
 632
 633     asf->packet_segments--;
 634     asf->packet_key_frame = num >> 7;
 635     asf->stream_index = asf->asfid2avid[num & 0x7f];
 636     // sequence should be ignored!
 637     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 638     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 639     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 640 //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);
 641     if (asf->packet_replic_size >= 8) {
 642         asf->packet_obj_size = get_le32(pb);
 643         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 644             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 645             return -1;
 646         }
 647         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 648         if(asf->packet_replic_size >= 8+38+4){
 649 //            for(i=0; i<asf->packet_replic_size-8; i++)
 650 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 651 //            av_log(s, AV_LOG_DEBUG, "\n");
 652             url_fskip(pb, 10);
 653             ts0= get_le64(pb);
 654             ts1= get_le64(pb);
 655             url_fskip(pb, 12);
 656             get_le32(pb);
 657             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 658             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 659             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 660         }else
 661             url_fskip(pb, asf->packet_replic_size - 8);
 662         rsize += asf->packet_replic_size; // FIXME - check validity
 663     } else if (asf->packet_replic_size==1){
 664         // multipacket - frag_offset is beginning timestamp
 665         asf->packet_time_start = asf->packet_frag_offset;
 666         asf->packet_frag_offset = 0;
 667         asf->packet_frag_timestamp = asf->packet_timestamp;
 668
 669         asf->packet_time_delta = get_byte(pb);
 670         rsize++;
 671     }else if(asf->packet_replic_size!=0){
 672         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 673         return -1;
 674     }
 675     if (asf->packet_flags & 0x01) {
 676         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 677         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 678             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 679             return -1;
 680         }
 681         //printf("Fragsize %d\n", asf->packet_frag_size);
 682     } else {
 683         asf->packet_frag_size = asf->packet_size_left - rsize;
 684         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 685     }
 686     if (asf->packet_replic_size == 1) {
 687         asf->packet_multi_size = asf->packet_frag_size;
 688         if (asf->packet_multi_size > asf->packet_size_left)
 689             return -1;
 690     }
 691     asf->packet_size_left -= rsize;
 692     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 693
 694     return 0;
 695 }
 696
 697 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 698 {
 699     ASFContext *asf = s->priv_data;
 700     ASFStream *asf_st = 0;
 701     for (;;) {
 702         if(url_feof(pb))
 703             return AVERROR_EOF;
 704         if (asf->packet_size_left < FRAME_HEADER_SIZE
 705             || asf->packet_segments < 1) {
 706             //asf->packet_size_left <= asf->packet_padsize) {
 707             int ret = asf->packet_size_left + asf->packet_padsize;
 708             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 709             assert(ret>=0);
 710             /* fail safe */
 711             url_fskip(pb, ret);
 712
 713             asf->packet_pos= url_ftell(pb);
 714             if (asf->data_object_size != (uint64_t)-1 &&
 715                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 716                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 717             return 1;
 718         }
 719         if (asf->packet_time_start == 0) {
 720             if(asf_read_frame_header(s, pb) < 0){
 721                 asf->packet_segments= 0;
 722                 continue;
 723             }
 724             if (asf->stream_index < 0
 725                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 726                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 727                 ) {
 728                 asf->packet_time_start = 0;
 729                 /* unhandled packet (should not happen) */
 730                 url_fskip(pb, asf->packet_frag_size);
 731                 asf->packet_size_left -= asf->packet_frag_size;
 732                 if(asf->stream_index < 0)
 733                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 734                 continue;
 735             }
 736             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 737         }
 738         asf_st = asf->asf_st;
 739
 740         if (asf->packet_replic_size == 1) {
 741             // frag_offset is here used as the beginning timestamp
 742             asf->packet_frag_timestamp = asf->packet_time_start;
 743             asf->packet_time_start += asf->packet_time_delta;
 744             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 745             asf->packet_size_left--;
 746             asf->packet_multi_size--;
 747             if (asf->packet_multi_size < asf->packet_obj_size)
 748             {
 749                 asf->packet_time_start = 0;
 750                 url_fskip(pb, asf->packet_multi_size);
 751                 asf->packet_size_left -= asf->packet_multi_size;
 752                 continue;
 753             }
 754             asf->packet_multi_size -= asf->packet_obj_size;
 755             //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);
 756         }
 757         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 758               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 759            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 760             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 761                 asf_st->frag_offset, asf->packet_frag_size,
 762                 asf->packet_obj_size, asf_st->pkt.size);
 763             asf->packet_obj_size= asf_st->pkt.size;
 764         }
 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.dts = 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         if (s->key && s->keylen == 20)
 807             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 808                             asf->packet_frag_size);
 809         asf_st->frag_offset += asf->packet_frag_size;
 810         /* test if whole packet is read */
 811         if (asf_st->frag_offset == asf_st->pkt.size) {
 812             //workaround for macroshit radio DVR-MS files
 813             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 814                && asf_st->pkt.size > 100){
 815                 int i;
 816                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 817                 if(i == asf_st->pkt.size){
 818                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 819                     asf_st->frag_offset = 0;
 820                     av_free_packet(&asf_st->pkt);
 821                     continue;
 822                 }
 823             }
 824
 825             /* return packet */
 826             if (asf_st->ds_span > 1) {
 827               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 828                     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);
 829               }else{
 830                 /* packet descrambling */
 831                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 832                 if (newdata) {
 833                     int offset = 0;
 834                     while (offset < asf_st->pkt.size) {
 835                         int off = offset / asf_st->ds_chunk_size;
 836                         int row = off / asf_st->ds_span;
 837                         int col = off % asf_st->ds_span;
 838                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 839                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 840
 841                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 842                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 843                         memcpy(newdata + offset,
 844                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 845                                asf_st->ds_chunk_size);
 846                         offset += asf_st->ds_chunk_size;
 847                     }
 848                     av_free(asf_st->pkt.data);
 849                     asf_st->pkt.data = newdata;
 850                 }
 851               }
 852             }
 853             asf_st->frag_offset = 0;
 854             *pkt= asf_st->pkt;
 855             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 856             asf_st->pkt.size = 0;
 857             asf_st->pkt.data = 0;
 858             break; // packet completed
 859         }
 860     }
 861     return 0;
 862 }
 863
 864 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 865 {
 866     ASFContext *asf = s->priv_data;
 867
 868     for (;;) {
 869         int ret;
 870
 871         /* parse cached packets, if any */
 872         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 873             return ret;
 874         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 875             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 876         asf->packet_time_start = 0;
 877     }
 878
 879     return 0;
 880 }
 881
 882 // Added to support seeking after packets have been read
 883 // If information is not reset, read_packet fails due to
 884 // leftover information from previous reads
 885 static void asf_reset_header(AVFormatContext *s)
 886 {
 887     ASFContext *asf = s->priv_data;
 888     ASFStream *asf_st;
 889     int i;
 890
 891     asf->packet_nb_frames = 0;
 892     asf->packet_size_left = 0;
 893     asf->packet_segments = 0;
 894     asf->packet_flags = 0;
 895     asf->packet_property = 0;
 896     asf->packet_timestamp = 0;
 897     asf->packet_segsizetype = 0;
 898     asf->packet_segments = 0;
 899     asf->packet_seq = 0;
 900     asf->packet_replic_size = 0;
 901     asf->packet_key_frame = 0;
 902     asf->packet_padsize = 0;
 903     asf->packet_frag_offset = 0;
 904     asf->packet_frag_size = 0;
 905     asf->packet_frag_timestamp = 0;
 906     asf->packet_multi_size = 0;
 907     asf->packet_obj_size = 0;
 908     asf->packet_time_delta = 0;
 909     asf->packet_time_start = 0;
 910
 911     for(i=0; i<s->nb_streams; i++){
 912         asf_st= s->streams[i]->priv_data;
 913         av_free_packet(&asf_st->pkt);
 914         asf_st->frag_offset=0;
 915         asf_st->seq=0;
 916     }
 917     asf->asf_st= NULL;
 918 }
 919
 920 static int asf_read_close(AVFormatContext *s)
 921 {
 922     int i;
 923
 924     asf_reset_header(s);
 925     for(i=0;i<s->nb_streams;i++) {
 926         AVStream *st = s->streams[i];
 927         av_free(st->codec->palctrl);
 928     }
 929     return 0;
 930 }
 931
 932 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 933 {
 934     ASFContext *asf = s->priv_data;
 935     AVPacket pkt1, *pkt = &pkt1;
 936     ASFStream *asf_st;
 937     int64_t pts;
 938     int64_t pos= *ppos;
 939     int i;
 940     int64_t start_pos[s->nb_streams];
 941
 942     for(i=0; i<s->nb_streams; i++){
 943         start_pos[i]= pos;
 944     }
 945
 946     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 947     *ppos= pos;
 948     url_fseek(s->pb, pos, SEEK_SET);
 949
 950 //printf("asf_read_pts\n");
 951     asf_reset_header(s);
 952     for(;;){
 953         if (av_read_frame(s, pkt) < 0){
 954             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 955             return AV_NOPTS_VALUE;
 956         }
 957
 958         pts= pkt->pts;
 959
 960         av_free_packet(pkt);
 961         if(pkt->flags&PKT_FLAG_KEY){
 962             i= pkt->stream_index;
 963
 964             asf_st= s->streams[i]->priv_data;
 965
 966 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 967             pos= asf_st->packet_pos;
 968
 969             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 970             start_pos[i]= asf_st->packet_pos + 1;
 971
 972             if(pkt->stream_index == stream_index)
 973                break;
 974         }
 975     }
 976
 977     *ppos= pos;
 978 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 979
 980     return pts;
 981 }
 982
 983 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 984 {
 985     ff_asf_guid g;
 986     ASFContext *asf = s->priv_data;
 987     int64_t current_pos= url_ftell(s->pb);
 988     int i;
 989
 990     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 991     get_guid(s->pb, &g);
 992     if (!guidcmp(&g, &index_guid)) {
 993         int64_t itime;
 994         int pct, ict;
 995         int64_t av_unused 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             int64_t pos      = s->data_offset + asf->packet_size*(int64_t)pktnum;
1006             int64_t index_pts= av_rescale(itime, i, 10000);
1007
1008             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1009             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1010         }
1011         asf->index_read= 1;
1012     }
1013     url_fseek(s->pb, current_pos, SEEK_SET);
1014 }
1015
1016 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1017 {
1018     ASFContext *asf = s->priv_data;
1019     AVStream *st = s->streams[stream_index];
1020     int64_t pos;
1021     int index;
1022
1023     if (asf->packet_size <= 0)
1024         return -1;
1025
1026     /* Try using the protocol's read_seek if available */
1027     if(s->pb) {
1028         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1029         if(ret >= 0)
1030             asf_reset_header(s);
1031         if (ret != AVERROR(ENOSYS))
1032             return ret;
1033     }
1034
1035     if (!asf->index_read)
1036         asf_build_simple_index(s, stream_index);
1037
1038     if(!(asf->index_read && st->index_entries)){
1039         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1040             return -1;
1041     }else{
1042         index= av_index_search_timestamp(st, pts, flags);
1043         if(index<0)
1044             return -1;
1045
1046         /* find the position */
1047         pos = st->index_entries[index].pos;
1048
1049     // various attempts to find key frame have failed so far
1050     //    asf_reset_header(s);
1051     //    url_fseek(s->pb, pos, SEEK_SET);
1052     //    key_pos = pos;
1053     //     for(i=0;i<16;i++){
1054     //         pos = url_ftell(s->pb);
1055     //         if (av_read_frame(s, &pkt) < 0){
1056     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1057     //             return -1;
1058     //         }
1059     //         asf_st = s->streams[stream_index]->priv_data;
1060     //         pos += st->parser->frame_offset;
1061     //
1062     //         if (pkt.size > b) {
1063     //             b = pkt.size;
1064     //             key_pos = pos;
1065     //         }
1066     //
1067     //         av_free_packet(&pkt);
1068     //     }
1069
1070         /* do the seek */
1071         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1072         url_fseek(s->pb, pos, SEEK_SET);
1073     }
1074     asf_reset_header(s);
1075     return 0;
1076 }
1077
1078 AVInputFormat asf_demuxer = {
1079     "asf",
1080     NULL_IF_CONFIG_SMALL("ASF format"),
1081     sizeof(ASFContext),
1082     asf_probe,
1083     asf_read_header,
1084     asf_read_packet,
1085     asf_read_close,
1086     asf_read_seek,
1087     asf_read_pts,
1088     .metadata_conv = ff_asf_metadata_conv,
1089 };