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 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 (!guidcmp(g, &cmp)) \
  52     dprintf(NULL, "(GUID: %s) ", #cmp)
  53
  54 static void print_guid(const 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(GUID));
  93 }
  94
  95 static void get_guid(ByteIOContext *s, 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     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             int64_t pos_ex_st;
 447             pos_ex_st = url_ftell(pb);
 448
 449             get_le64(pb); // starttime
 450             get_le64(pb); // endtime
 451             leak_rate = get_le32(pb); // leak-datarate
 452             get_le32(pb); // bucket-datasize
 453             get_le32(pb); // init-bucket-fullness
 454             get_le32(pb); // alt-leak-datarate
 455             get_le32(pb); // alt-bucket-datasize
 456             get_le32(pb); // alt-init-bucket-fullness
 457             get_le32(pb); // max-object-size
 458             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 459             stream_num = get_le16(pb); // stream-num
 460             get_le16(pb); // stream-language-id-index
 461             get_le64(pb); // avg frametime in 100ns units
 462             stream_ct = get_le16(pb); //stream-name-count
 463             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 464
 465             if (stream_num < 128)
 466                 bitrate[stream_num] = leak_rate;
 467
 468             for (i=0; i<stream_ct; i++){
 469                 get_le16(pb);
 470                 ext_len = get_le16(pb);
 471                 url_fseek(pb, ext_len, SEEK_CUR);
 472             }
 473
 474             for (i=0; i<payload_ext_ct; i++){
 475                 get_guid(pb, &g);
 476                 ext_d=get_le16(pb);
 477                 ext_len=get_le32(pb);
 478                 url_fseek(pb, ext_len, SEEK_CUR);
 479             }
 480
 481             // there could be a optional stream properties object to follow
 482             // if so the next iteration will pick it up
 483         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
 484             int v1, v2;
 485             get_guid(pb, &g);
 486             v1 = get_le32(pb);
 487             v2 = get_le16(pb);
 488 #if 0
 489         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
 490             int len, v1, n, num;
 491             char str[256], *q;
 492             char tag[16];
 493
 494             get_guid(pb, &g);
 495             print_guid(&g);
 496
 497             n = get_le32(pb);
 498             for(i=0;i<n;i++) {
 499                 num = get_le16(pb); /* stream number */
 500                 get_str16(pb, str, sizeof(str));
 501                 get_str16(pb, str, sizeof(str));
 502                 len = get_le16(pb);
 503                 q = tag;
 504                 while (len > 0) {
 505                     v1 = get_byte(pb);
 506                     if ((q - tag) < sizeof(tag) - 1)
 507                         *q++ = v1;
 508                     len--;
 509                 }
 510                 *q = '\0';
 511             }
 512 #endif
 513         } else if (url_feof(pb)) {
 514             return -1;
 515         } else {
 516             url_fseek(pb, gsize - 24, SEEK_CUR);
 517         }
 518     }
 519     get_guid(pb, &g);
 520     get_le64(pb);
 521     get_byte(pb);
 522     get_byte(pb);
 523     if (url_feof(pb))
 524         return -1;
 525     asf->data_offset = url_ftell(pb);
 526     asf->packet_size_left = 0;
 527
 528
 529     for(i=0; i<128; i++){
 530         int stream_num= asf->asfid2avid[i];
 531         if(stream_num>=0){
 532             AVStream *st = s->streams[stream_num];
 533             if (!st->codec->bit_rate)
 534                 st->codec->bit_rate = bitrate[i];
 535             if (dar[i].num > 0 && dar[i].den > 0)
 536                 av_reduce(&st->sample_aspect_ratio.num,
 537                           &st->sample_aspect_ratio.den,
 538                           dar[i].num, dar[i].den, INT_MAX);
 539 //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);
 540         }
 541     }
 542
 543     return 0;
 544 }
 545
 546 #define DO_2BITS(bits, var, defval) \
 547     switch (bits & 3) \
 548     { \
 549     case 3: var = get_le32(pb); rsize += 4; break; \
 550     case 2: var = get_le16(pb); rsize += 2; break; \
 551     case 1: var = get_byte(pb); rsize++; break; \
 552     default: var = defval; break; \
 553     }
 554
 555 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 556 {
 557     ASFContext *asf = s->priv_data;
 558     uint32_t packet_length, padsize;
 559     int rsize = 8;
 560     int c, d, e, off;
 561
 562     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
 563
 564     c=d=e=-1;
 565     while(off-- > 0){
 566         c=d; d=e;
 567         e= get_byte(pb);
 568         if(c == 0x82 && !d && !e)
 569             break;
 570     }
 571
 572     if (c != 0x82) {
 573         if (!url_feof(pb))
 574             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 575     }
 576     if ((c & 0x8f) == 0x82) {
 577         if (d || e) {
 578             if (!url_feof(pb))
 579                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 580             return -1;
 581         }
 582         c= get_byte(pb);
 583         d= get_byte(pb);
 584         rsize+=3;
 585     }else{
 586         url_fseek(pb, -1, SEEK_CUR); //FIXME
 587     }
 588
 589     asf->packet_flags    = c;
 590     asf->packet_property = d;
 591
 592     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 593     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 594     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 595
 596     //the following checks prevent overflows and infinite loops
 597     if(packet_length >= (1U<<29)){
 598         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 599         return -1;
 600     }
 601     if(padsize >= packet_length){
 602         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 603         return -1;
 604     }
 605
 606     asf->packet_timestamp = get_le32(pb);
 607     get_le16(pb); /* duration */
 608     // rsize has at least 11 bytes which have to be present
 609
 610     if (asf->packet_flags & 0x01) {
 611         asf->packet_segsizetype = get_byte(pb); rsize++;
 612         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 613     } else {
 614         asf->packet_segments = 1;
 615         asf->packet_segsizetype = 0x80;
 616     }
 617     asf->packet_size_left = packet_length - padsize - rsize;
 618     if (packet_length < asf->hdr.min_pktsize)
 619         padsize += asf->hdr.min_pktsize - packet_length;
 620     asf->packet_padsize = padsize;
 621     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 622     return 0;
 623 }
 624
 625 /**
 626  *
 627  * @return <0 if error
 628  */
 629 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 630     ASFContext *asf = s->priv_data;
 631     int rsize = 1;
 632     int num = get_byte(pb);
 633     int64_t ts0, ts1;
 634
 635     asf->packet_segments--;
 636     asf->packet_key_frame = num >> 7;
 637     asf->stream_index = asf->asfid2avid[num & 0x7f];
 638     // sequence should be ignored!
 639     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 640     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 641     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 642 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
 643     if (asf->packet_replic_size >= 8) {
 644         asf->packet_obj_size = get_le32(pb);
 645         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 646             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 647             return -1;
 648         }
 649         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 650         if(asf->packet_replic_size >= 8+38+4){
 651 //            for(i=0; i<asf->packet_replic_size-8; i++)
 652 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 653 //            av_log(s, AV_LOG_DEBUG, "\n");
 654             url_fskip(pb, 10);
 655             ts0= get_le64(pb);
 656             ts1= get_le64(pb);
 657             url_fskip(pb, 12);
 658             get_le32(pb);
 659             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 660             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 661             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 662         }else
 663             url_fskip(pb, asf->packet_replic_size - 8);
 664         rsize += asf->packet_replic_size; // FIXME - check validity
 665     } else if (asf->packet_replic_size==1){
 666         // multipacket - frag_offset is beginning timestamp
 667         asf->packet_time_start = asf->packet_frag_offset;
 668         asf->packet_frag_offset = 0;
 669         asf->packet_frag_timestamp = asf->packet_timestamp;
 670
 671         asf->packet_time_delta = get_byte(pb);
 672         rsize++;
 673     }else if(asf->packet_replic_size!=0){
 674         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 675         return -1;
 676     }
 677     if (asf->packet_flags & 0x01) {
 678         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 679         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 680             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 681             return -1;
 682         }
 683         //printf("Fragsize %d\n", asf->packet_frag_size);
 684     } else {
 685         asf->packet_frag_size = asf->packet_size_left - rsize;
 686         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 687     }
 688     if (asf->packet_replic_size == 1) {
 689         asf->packet_multi_size = asf->packet_frag_size;
 690         if (asf->packet_multi_size > asf->packet_size_left)
 691             return -1;
 692     }
 693     asf->packet_size_left -= rsize;
 694     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 695
 696     return 0;
 697 }
 698
 699 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 700 {
 701     ASFContext *asf = s->priv_data;
 702     ASFStream *asf_st = 0;
 703     for (;;) {
 704         if(url_feof(pb))
 705             return AVERROR(EIO);
 706         if (asf->packet_size_left < FRAME_HEADER_SIZE
 707             || asf->packet_segments < 1) {
 708             //asf->packet_size_left <= asf->packet_padsize) {
 709             int ret = asf->packet_size_left + asf->packet_padsize;
 710             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 711             assert(ret>=0);
 712             /* fail safe */
 713             url_fskip(pb, ret);
 714
 715             asf->packet_pos= url_ftell(pb);
 716             if (asf->data_object_size != (uint64_t)-1 &&
 717                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 718                 return AVERROR(EIO); /* Do not exceed the size of the data object */
 719             return 1;
 720         }
 721         if (asf->packet_time_start == 0) {
 722             if(asf_read_frame_header(s, pb) < 0){
 723                 asf->packet_segments= 0;
 724                 continue;
 725             }
 726             if (asf->stream_index < 0
 727                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 728                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 729                 ) {
 730                 asf->packet_time_start = 0;
 731                 /* unhandled packet (should not happen) */
 732                 url_fskip(pb, asf->packet_frag_size);
 733                 asf->packet_size_left -= asf->packet_frag_size;
 734                 if(asf->stream_index < 0)
 735                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 736                 continue;
 737             }
 738             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 739         }
 740         asf_st = asf->asf_st;
 741
 742         if (asf->packet_replic_size == 1) {
 743             // frag_offset is here used as the beginning timestamp
 744             asf->packet_frag_timestamp = asf->packet_time_start;
 745             asf->packet_time_start += asf->packet_time_delta;
 746             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 747             asf->packet_size_left--;
 748             asf->packet_multi_size--;
 749             if (asf->packet_multi_size < asf->packet_obj_size)
 750             {
 751                 asf->packet_time_start = 0;
 752                 url_fskip(pb, asf->packet_multi_size);
 753                 asf->packet_size_left -= asf->packet_multi_size;
 754                 continue;
 755             }
 756             asf->packet_multi_size -= asf->packet_obj_size;
 757             //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);
 758         }
 759         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 760               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 761            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 762             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 763                 asf_st->frag_offset, asf->packet_frag_size,
 764                 asf->packet_obj_size, asf_st->pkt.size);
 765             asf->packet_obj_size= asf_st->pkt.size;
 766         }
 767
 768         if (   asf_st->pkt.size != asf->packet_obj_size
 769             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 770             if(asf_st->pkt.data){
 771                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 772                 asf_st->frag_offset = 0;
 773                 av_free_packet(&asf_st->pkt);
 774             }
 775             /* new packet */
 776             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 777             asf_st->seq = asf->packet_seq;
 778             asf_st->pkt.dts = asf->packet_frag_timestamp;
 779             asf_st->pkt.stream_index = asf->stream_index;
 780             asf_st->pkt.pos =
 781             asf_st->packet_pos= asf->packet_pos;
 782 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 783 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 784 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 785             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 786                 asf->packet_key_frame = 1;
 787             if (asf->packet_key_frame)
 788                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 789         }
 790
 791         /* read data */
 792         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 793         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 794         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 795         asf->packet_size_left -= asf->packet_frag_size;
 796         if (asf->packet_size_left < 0)
 797             continue;
 798
 799         if(   asf->packet_frag_offset >= asf_st->pkt.size
 800            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 801             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 802                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 803             continue;
 804         }
 805
 806         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 807                    asf->packet_frag_size);
 808         if (s->key && s->keylen == 20)
 809             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 810                             asf->packet_frag_size);
 811         asf_st->frag_offset += asf->packet_frag_size;
 812         /* test if whole packet is read */
 813         if (asf_st->frag_offset == asf_st->pkt.size) {
 814             //workaround for macroshit radio DVR-MS files
 815             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 816                && asf_st->pkt.size > 100){
 817                 int i;
 818                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 819                 if(i == asf_st->pkt.size){
 820                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 821                     asf_st->frag_offset = 0;
 822                     av_free_packet(&asf_st->pkt);
 823                     continue;
 824                 }
 825             }
 826
 827             /* return packet */
 828             if (asf_st->ds_span > 1) {
 829               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 830                     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);
 831               }else{
 832                 /* packet descrambling */
 833                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 834                 if (newdata) {
 835                     int offset = 0;
 836                     while (offset < asf_st->pkt.size) {
 837                         int off = offset / asf_st->ds_chunk_size;
 838                         int row = off / asf_st->ds_span;
 839                         int col = off % asf_st->ds_span;
 840                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 841                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 842
 843                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 844                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 845                         memcpy(newdata + offset,
 846                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 847                                asf_st->ds_chunk_size);
 848                         offset += asf_st->ds_chunk_size;
 849                     }
 850                     av_free(asf_st->pkt.data);
 851                     asf_st->pkt.data = newdata;
 852                 }
 853               }
 854             }
 855             asf_st->frag_offset = 0;
 856             *pkt= asf_st->pkt;
 857             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 858             asf_st->pkt.size = 0;
 859             asf_st->pkt.data = 0;
 860             break; // packet completed
 861         }
 862     }
 863     return 0;
 864 }
 865
 866 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 867 {
 868     ASFContext *asf = s->priv_data;
 869
 870     for (;;) {
 871         int ret;
 872
 873         /* parse cached packets, if any */
 874         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 875             return ret;
 876         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 877             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 878         asf->packet_time_start = 0;
 879     }
 880
 881     return 0;
 882 }
 883
 884 // Added to support seeking after packets have been read
 885 // If information is not reset, read_packet fails due to
 886 // leftover information from previous reads
 887 static void asf_reset_header(AVFormatContext *s)
 888 {
 889     ASFContext *asf = s->priv_data;
 890     ASFStream *asf_st;
 891     int i;
 892
 893     asf->packet_nb_frames = 0;
 894     asf->packet_size_left = 0;
 895     asf->packet_segments = 0;
 896     asf->packet_flags = 0;
 897     asf->packet_property = 0;
 898     asf->packet_timestamp = 0;
 899     asf->packet_segsizetype = 0;
 900     asf->packet_segments = 0;
 901     asf->packet_seq = 0;
 902     asf->packet_replic_size = 0;
 903     asf->packet_key_frame = 0;
 904     asf->packet_padsize = 0;
 905     asf->packet_frag_offset = 0;
 906     asf->packet_frag_size = 0;
 907     asf->packet_frag_timestamp = 0;
 908     asf->packet_multi_size = 0;
 909     asf->packet_obj_size = 0;
 910     asf->packet_time_delta = 0;
 911     asf->packet_time_start = 0;
 912
 913     for(i=0; i<s->nb_streams; i++){
 914         asf_st= s->streams[i]->priv_data;
 915         av_free_packet(&asf_st->pkt);
 916         asf_st->frag_offset=0;
 917         asf_st->seq=0;
 918     }
 919     asf->asf_st= NULL;
 920 }
 921
 922 static int asf_read_close(AVFormatContext *s)
 923 {
 924     int i;
 925
 926     asf_reset_header(s);
 927     for(i=0;i<s->nb_streams;i++) {
 928         AVStream *st = s->streams[i];
 929         av_free(st->codec->palctrl);
 930     }
 931     return 0;
 932 }
 933
 934 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 935 {
 936     ASFContext *asf = s->priv_data;
 937     AVPacket pkt1, *pkt = &pkt1;
 938     ASFStream *asf_st;
 939     int64_t pts;
 940     int64_t pos= *ppos;
 941     int i;
 942     int64_t start_pos[s->nb_streams];
 943
 944     for(i=0; i<s->nb_streams; i++){
 945         start_pos[i]= pos;
 946     }
 947
 948     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 949     *ppos= pos;
 950     url_fseek(s->pb, pos, SEEK_SET);
 951
 952 //printf("asf_read_pts\n");
 953     asf_reset_header(s);
 954     for(;;){
 955         if (av_read_frame(s, pkt) < 0){
 956             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 957             return AV_NOPTS_VALUE;
 958         }
 959
 960         pts= pkt->pts;
 961
 962         av_free_packet(pkt);
 963         if(pkt->flags&PKT_FLAG_KEY){
 964             i= pkt->stream_index;
 965
 966             asf_st= s->streams[i]->priv_data;
 967
 968 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 969             pos= asf_st->packet_pos;
 970
 971             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 972             start_pos[i]= asf_st->packet_pos + 1;
 973
 974             if(pkt->stream_index == stream_index)
 975                break;
 976         }
 977     }
 978
 979     *ppos= pos;
 980 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 981
 982     return pts;
 983 }
 984
 985 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 986 {
 987     GUID g;
 988     ASFContext *asf = s->priv_data;
 989     int64_t gsize, itime;
 990     int64_t pos, current_pos, index_pts;
 991     int i;
 992     int pct,ict;
 993
 994     current_pos = url_ftell(s->pb);
 995
 996     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 997     get_guid(s->pb, &g);
 998     if (!guidcmp(&g, &index_guid)) {
 999         gsize = get_le64(s->pb);
1000         get_guid(s->pb, &g);
1001         itime=get_le64(s->pb);
1002         pct=get_le32(s->pb);
1003         ict=get_le32(s->pb);
1004         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1005
1006         for (i=0;i<ict;i++){
1007             int pktnum=get_le32(s->pb);
1008             int pktct =get_le16(s->pb);
1009             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1010
1011             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1012             index_pts=av_rescale(itime, i, 10000);
1013
1014             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1015         }
1016         asf->index_read= 1;
1017     }
1018     url_fseek(s->pb, current_pos, SEEK_SET);
1019 }
1020
1021 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1022 {
1023     ASFContext *asf = s->priv_data;
1024     AVStream *st = s->streams[stream_index];
1025     int64_t pos;
1026     int index;
1027
1028     if (asf->packet_size <= 0)
1029         return -1;
1030
1031     /* Try using the protocol's read_seek if available */
1032     if(s->pb) {
1033         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1034         if(ret >= 0)
1035             asf_reset_header(s);
1036         if (ret != AVERROR(ENOSYS))
1037             return ret;
1038     }
1039
1040     if (!asf->index_read)
1041         asf_build_simple_index(s, stream_index);
1042
1043     if(!(asf->index_read && st->index_entries)){
1044         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1045             return -1;
1046     }else{
1047         index= av_index_search_timestamp(st, pts, flags);
1048         if(index<0)
1049             return -1;
1050
1051         /* find the position */
1052         pos = st->index_entries[index].pos;
1053         pts = st->index_entries[index].timestamp;
1054
1055     // various attempts to find key frame have failed so far
1056     //    asf_reset_header(s);
1057     //    url_fseek(s->pb, pos, SEEK_SET);
1058     //    key_pos = pos;
1059     //     for(i=0;i<16;i++){
1060     //         pos = url_ftell(s->pb);
1061     //         if (av_read_frame(s, &pkt) < 0){
1062     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1063     //             return -1;
1064     //         }
1065     //         asf_st = s->streams[stream_index]->priv_data;
1066     //         pos += st->parser->frame_offset;
1067     //
1068     //         if (pkt.size > b) {
1069     //             b = pkt.size;
1070     //             key_pos = pos;
1071     //         }
1072     //
1073     //         av_free_packet(&pkt);
1074     //     }
1075
1076         /* do the seek */
1077         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1078         url_fseek(s->pb, pos, SEEK_SET);
1079     }
1080     asf_reset_header(s);
1081     return 0;
1082 }
1083
1084 AVInputFormat asf_demuxer = {
1085     "asf",
1086     NULL_IF_CONFIG_SMALL("ASF format"),
1087     sizeof(ASFContext),
1088     asf_probe,
1089     asf_read_header,
1090     asf_read_packet,
1091     asf_read_close,
1092     asf_read_seek,
1093     asf_read_pts,
1094     .metadata_conv = ff_asf_metadata_conv,
1095 };