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