libavformat/asf.c

   1 /*
   2  * ASF compatible demuxer
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/common.h"
  23 #include "libavcodec/mpegaudio.h"
  24 #include "avformat.h"
  25 #include "riff.h"
  26 #include "asf.h"
  27 #include "asfcrypt.h"
  28
  29 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  30
  31 #undef NDEBUG
  32 #include <assert.h>
  33
  34 #define FRAME_HEADER_SIZE 17
  35 // Fix Me! FRAME_HEADER_SIZE may be different.
  36
  37 static const GUID index_guid = {
  38     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  39 };
  40
  41 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
  42     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  43 };
  44 /**********************************/
  45 /* decoding */
  46
  47 //#define DEBUG
  48
  49 #ifdef DEBUG
  50 #define PRINT_IF_GUID(g,cmp) \
  51 if (!memcmp(g, &cmp, sizeof(GUID))) \
  52     dprintf(NULL, "(GUID: %s) ", #cmp)
  53
  54 static void print_guid(const GUID *g)
  55 {
  56     int i;
  57     PRINT_IF_GUID(g, asf_header);
  58     else PRINT_IF_GUID(g, file_header);
  59     else PRINT_IF_GUID(g, stream_header);
  60     else PRINT_IF_GUID(g, audio_stream);
  61     else PRINT_IF_GUID(g, audio_conceal_none);
  62     else PRINT_IF_GUID(g, video_stream);
  63     else PRINT_IF_GUID(g, video_conceal_none);
  64     else PRINT_IF_GUID(g, command_stream);
  65     else PRINT_IF_GUID(g, comment_header);
  66     else PRINT_IF_GUID(g, codec_comment_header);
  67     else PRINT_IF_GUID(g, codec_comment1_header);
  68     else PRINT_IF_GUID(g, data_header);
  69     else PRINT_IF_GUID(g, index_guid);
  70     else PRINT_IF_GUID(g, head1_guid);
  71     else PRINT_IF_GUID(g, head2_guid);
  72     else PRINT_IF_GUID(g, my_guid);
  73     else PRINT_IF_GUID(g, ext_stream_header);
  74     else PRINT_IF_GUID(g, extended_content_header);
  75     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  76     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  77     else PRINT_IF_GUID(g, metadata_header);
  78     else PRINT_IF_GUID(g, stream_bitrate_guid);
  79     else
  80         dprintf(NULL, "(GUID: unknown) ");
  81     for(i=0;i<16;i++)
  82         dprintf(NULL, " 0x%02x,", (*g)[i]);
  83     dprintf(NULL, "}\n");
  84 }
  85 #undef PRINT_IF_GUID
  86 #else
  87 #define print_guid(g)
  88 #endif
  89
  90 static void get_guid(ByteIOContext *s, GUID *g)
  91 {
  92     assert(sizeof(*g) == 16);
  93     get_buffer(s, *g, sizeof(*g));
  94 }
  95
  96 #if 0
  97 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  98 {
  99     int len, c;
 100     char *q;
 101
 102     len = get_le16(pb);
 103     q = buf;
 104     while (len > 0) {
 105         c = get_le16(pb);
 106         if ((q - buf) < buf_size - 1)
 107             *q++ = c;
 108         len--;
 109     }
 110     *q = '\0';
 111 }
 112 #endif
 113
 114 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 115 {
 116     char* q = buf;
 117     len /= 2;
 118     while (len--) {
 119         uint8_t tmp;
 120         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 121     }
 122     *q = '\0';
 123 }
 124
 125 static int asf_probe(AVProbeData *pd)
 126 {
 127     /* check file header */
 128     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
 129         return AVPROBE_SCORE_MAX;
 130     else
 131         return 0;
 132 }
 133
 134 static int get_value(ByteIOContext *pb, int type){
 135     switch(type){
 136         case 2: return get_le32(pb);
 137         case 3: return get_le32(pb);
 138         case 4: return get_le64(pb);
 139         case 5: return get_le16(pb);
 140         default:return INT_MIN;
 141     }
 142 }
 143
 144 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 145 {
 146     char value[1024];
 147     if (type <= 1) {         // unicode or byte
 148         get_str16_nolen(s->pb, len, value, sizeof(value));
 149     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
 150         uint64_t num = get_value(s->pb, type);
 151         snprintf(value, sizeof(value), "%"PRIu64, num);
 152     } else {
 153         url_fskip(s->pb, len);
 154         return;
 155     }
 156     if (strncmp(key, "WM/", 3))
 157         key += 3;
 158     av_metadata_set(&s->metadata, key, value);
 159 }
 160
 161 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 162 {
 163     ASFContext *asf = s->priv_data;
 164     GUID g;
 165     ByteIOContext *pb = s->pb;
 166     AVStream *st;
 167     ASFStream *asf_st;
 168     int size, i;
 169     int64_t gsize;
 170     AVRational dar[128];
 171     uint32_t bitrate[128];
 172
 173     memset(dar, 0, sizeof(dar));
 174     memset(bitrate, 0, sizeof(bitrate));
 175
 176     get_guid(pb, &g);
 177     if (memcmp(&g, &asf_header, sizeof(GUID)))
 178         return -1;
 179     get_le64(pb);
 180     get_le32(pb);
 181     get_byte(pb);
 182     get_byte(pb);
 183     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 184     for(;;) {
 185         get_guid(pb, &g);
 186         gsize = get_le64(pb);
 187         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
 188         print_guid(&g);
 189         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 190         if (!memcmp(&g, &data_header, sizeof(GUID))) {
 191             asf->data_object_offset = url_ftell(pb);
 192             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 193             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 194                 asf->data_object_size = gsize - 24;
 195             } else {
 196                 asf->data_object_size = (uint64_t)-1;
 197             }
 198             break;
 199         }
 200         if (gsize < 24)
 201             return -1;
 202         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 203             get_guid(pb, &asf->hdr.guid);
 204             asf->hdr.file_size          = get_le64(pb);
 205             asf->hdr.create_time        = get_le64(pb);
 206             asf->nb_packets             = get_le64(pb);
 207             asf->hdr.play_time          = get_le64(pb);
 208             asf->hdr.send_time          = get_le64(pb);
 209             asf->hdr.preroll            = get_le32(pb);
 210             asf->hdr.ignore             = get_le32(pb);
 211             asf->hdr.flags              = get_le32(pb);
 212             asf->hdr.min_pktsize        = get_le32(pb);
 213             asf->hdr.max_pktsize        = get_le32(pb);
 214             asf->hdr.max_bitrate        = get_le32(pb);
 215             asf->packet_size = asf->hdr.max_pktsize;
 216         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 217             enum CodecType type;
 218             int type_specific_size, sizeX;
 219             uint64_t total_size;
 220             unsigned int tag1;
 221             int64_t pos1, pos2, start_time;
 222             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 223
 224             pos1 = url_ftell(pb);
 225
 226             st = av_new_stream(s, 0);
 227             if (!st)
 228                 return AVERROR(ENOMEM);
 229             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 230             asf_st = av_mallocz(sizeof(ASFStream));
 231             if (!asf_st)
 232                 return AVERROR(ENOMEM);
 233             st->priv_data = asf_st;
 234             start_time = asf->hdr.preroll;
 235
 236             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 237                 st->duration = asf->hdr.send_time /
 238                     (10000000 / 1000) - start_time;
 239             }
 240             get_guid(pb, &g);
 241
 242             test_for_ext_stream_audio = 0;
 243             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 244                 type = CODEC_TYPE_AUDIO;
 245             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 246                 type = CODEC_TYPE_VIDEO;
 247             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 248                 type = CODEC_TYPE_DATA;
 249             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 250                 test_for_ext_stream_audio = 1;
 251                 type = CODEC_TYPE_UNKNOWN;
 252             } else {
 253                 return -1;
 254             }
 255             get_guid(pb, &g);
 256             total_size = get_le64(pb);
 257             type_specific_size = get_le32(pb);
 258             get_le32(pb);
 259             st->id = get_le16(pb) & 0x7f; /* stream id */
 260             // mapping of asf ID to AV stream ID;
 261             asf->asfid2avid[st->id] = s->nb_streams - 1;
 262
 263             get_le32(pb);
 264
 265             if (test_for_ext_stream_audio) {
 266                 get_guid(pb, &g);
 267                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 268                     type = CODEC_TYPE_AUDIO;
 269                     is_dvr_ms_audio=1;
 270                     get_guid(pb, &g);
 271                     get_le32(pb);
 272                     get_le32(pb);
 273                     get_le32(pb);
 274                     get_guid(pb, &g);
 275                     get_le32(pb);
 276                 }
 277             }
 278
 279             st->codec->codec_type = type;
 280             if (type == CODEC_TYPE_AUDIO) {
 281                 get_wav_header(pb, st->codec, type_specific_size);
 282                 if (is_dvr_ms_audio) {
 283                     // codec_id and codec_tag are unreliable in dvr_ms
 284                     // files. Set them later by probing stream.
 285                     st->codec->codec_id = CODEC_ID_PROBE;
 286                     st->codec->codec_tag = 0;
 287                 }
 288                 st->need_parsing = AVSTREAM_PARSE_FULL;
 289                 /* We have to init the frame size at some point .... */
 290                 pos2 = url_ftell(pb);
 291                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 292                     asf_st->ds_span = get_byte(pb);
 293                     asf_st->ds_packet_size = get_le16(pb);
 294                     asf_st->ds_chunk_size = get_le16(pb);
 295                     get_le16(pb); //ds_data_size
 296                     get_byte(pb); //ds_silence_data
 297                 }
 298                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 299                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 300                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 301                 if (asf_st->ds_span > 1) {
 302                     if (!asf_st->ds_chunk_size
 303                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 304                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 305                         asf_st->ds_span = 0; // disable descrambling
 306                 }
 307                 switch (st->codec->codec_id) {
 308                 case CODEC_ID_MP3:
 309                     st->codec->frame_size = MPA_FRAME_SIZE;
 310                     break;
 311                 case CODEC_ID_PCM_S16LE:
 312                 case CODEC_ID_PCM_S16BE:
 313                 case CODEC_ID_PCM_U16LE:
 314                 case CODEC_ID_PCM_U16BE:
 315                 case CODEC_ID_PCM_S8:
 316                 case CODEC_ID_PCM_U8:
 317                 case CODEC_ID_PCM_ALAW:
 318                 case CODEC_ID_PCM_MULAW:
 319                     st->codec->frame_size = 1;
 320                     break;
 321                 default:
 322                     /* This is probably wrong, but it prevents a crash later */
 323                     st->codec->frame_size = 1;
 324                     break;
 325                 }
 326             } else if (type == CODEC_TYPE_VIDEO) {
 327                 get_le32(pb);
 328                 get_le32(pb);
 329                 get_byte(pb);
 330                 size = get_le16(pb); /* size */
 331                 sizeX= get_le32(pb); /* size */
 332                 st->codec->width = get_le32(pb);
 333                 st->codec->height = get_le32(pb);
 334                 /* not available for asf */
 335                 get_le16(pb); /* panes */
 336                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 337                 tag1 = get_le32(pb);
 338                 url_fskip(pb, 20);
 339 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 340                 size= sizeX;
 341                 if (size > 40) {
 342                     st->codec->extradata_size = size - 40;
 343                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 344                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 345                 }
 346
 347         /* Extract palette from extradata if bpp <= 8 */
 348         /* This code assumes that extradata contains only palette */
 349         /* This is true for all paletted codecs implemented in ffmpeg */
 350         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 351             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 352 #ifdef WORDS_BIGENDIAN
 353             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 354                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 355 #else
 356             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 357                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 358 #endif
 359             st->codec->palctrl->palette_changed = 1;
 360         }
 361
 362                 st->codec->codec_tag = tag1;
 363                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 364                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 365                     st->need_parsing = AVSTREAM_PARSE_FULL;
 366             }
 367             pos2 = url_ftell(pb);
 368             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 369         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 370             int len1, len2, len3, len4, len5;
 371
 372             len1 = get_le16(pb);
 373             len2 = get_le16(pb);
 374             len3 = get_le16(pb);
 375             len4 = get_le16(pb);
 376             len5 = get_le16(pb);
 377             get_tag(s, "title"    , 0, len1);
 378             get_tag(s, "author"   , 0, len2);
 379             get_tag(s, "copyright", 0, len3);
 380             get_tag(s, "comment"  , 0, len4);
 381             url_fskip(pb, len5);
 382         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
 383             int stream_count = get_le16(pb);
 384             int j;
 385
 386 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
 387 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
 388             for(j = 0; j < stream_count; j++) {
 389                 int flags, bitrate, stream_id;
 390
 391                 flags= get_le16(pb);
 392                 bitrate= get_le32(pb);
 393                 stream_id= (flags & 0x7f);
 394 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 395                 asf->stream_bitrates[stream_id]= bitrate;
 396             }
 397        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 398                 int desc_count, i;
 399
 400                 desc_count = get_le16(pb);
 401                 for(i=0;i<desc_count;i++)
 402                 {
 403                         int name_len,value_type,value_len;
 404                         char name[1024];
 405
 406                         name_len = get_le16(pb);
 407                         get_str16_nolen(pb, name_len, name, sizeof(name));
 408                         value_type = get_le16(pb);
 409                         value_len = get_le16(pb);
 410                         get_tag(s, name, value_type, value_len);
 411                 }
 412         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
 413             int n, stream_num, name_len, value_len, value_type, value_num;
 414             n = get_le16(pb);
 415
 416             for(i=0;i<n;i++) {
 417                 char name[1024];
 418
 419                 get_le16(pb); //lang_list_index
 420                 stream_num= get_le16(pb);
 421                 name_len=   get_le16(pb);
 422                 value_type= get_le16(pb);
 423                 value_len=  get_le32(pb);
 424
 425                 get_str16_nolen(pb, name_len, name, sizeof(name));
 426 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 427                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 428                 url_fskip(pb, value_len - 2);
 429
 430                 if(stream_num<128){
 431                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 432                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 433                 }
 434             }
 435         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 436             int ext_len, payload_ext_ct, stream_ct;
 437             uint32_t ext_d, leak_rate, stream_num;
 438             int64_t pos_ex_st;
 439             pos_ex_st = url_ftell(pb);
 440
 441             get_le64(pb); // starttime
 442             get_le64(pb); // endtime
 443             leak_rate = get_le32(pb); // leak-datarate
 444             get_le32(pb); // bucket-datasize
 445             get_le32(pb); // init-bucket-fullness
 446             get_le32(pb); // alt-leak-datarate
 447             get_le32(pb); // alt-bucket-datasize
 448             get_le32(pb); // alt-init-bucket-fullness
 449             get_le32(pb); // max-object-size
 450             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 451             stream_num = get_le16(pb); // stream-num
 452             get_le16(pb); // stream-language-id-index
 453             get_le64(pb); // avg frametime in 100ns units
 454             stream_ct = get_le16(pb); //stream-name-count
 455             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 456
 457             if (stream_num < 128)
 458                 bitrate[stream_num] = leak_rate;
 459
 460             for (i=0; i<stream_ct; i++){
 461                 get_le16(pb);
 462                 ext_len = get_le16(pb);
 463                 url_fseek(pb, ext_len, SEEK_CUR);
 464             }
 465
 466             for (i=0; i<payload_ext_ct; i++){
 467                 get_guid(pb, &g);
 468                 ext_d=get_le16(pb);
 469                 ext_len=get_le32(pb);
 470                 url_fseek(pb, ext_len, SEEK_CUR);
 471             }
 472
 473             // there could be a optional stream properties object to follow
 474             // if so the next iteration will pick it up
 475         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 476             int v1, v2;
 477             get_guid(pb, &g);
 478             v1 = get_le32(pb);
 479             v2 = get_le16(pb);
 480 #if 0
 481         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 482             int len, v1, n, num;
 483             char str[256], *q;
 484             char tag[16];
 485
 486             get_guid(pb, &g);
 487             print_guid(&g);
 488
 489             n = get_le32(pb);
 490             for(i=0;i<n;i++) {
 491                 num = get_le16(pb); /* stream number */
 492                 get_str16(pb, str, sizeof(str));
 493                 get_str16(pb, str, sizeof(str));
 494                 len = get_le16(pb);
 495                 q = tag;
 496                 while (len > 0) {
 497                     v1 = get_byte(pb);
 498                     if ((q - tag) < sizeof(tag) - 1)
 499                         *q++ = v1;
 500                     len--;
 501                 }
 502                 *q = '\0';
 503             }
 504 #endif
 505         } else if (url_feof(pb)) {
 506             return -1;
 507         } else {
 508             url_fseek(pb, gsize - 24, SEEK_CUR);
 509         }
 510     }
 511     get_guid(pb, &g);
 512     get_le64(pb);
 513     get_byte(pb);
 514     get_byte(pb);
 515     if (url_feof(pb))
 516         return -1;
 517     asf->data_offset = url_ftell(pb);
 518     asf->packet_size_left = 0;
 519
 520
 521     for(i=0; i<128; i++){
 522         int stream_num= asf->asfid2avid[i];
 523         if(stream_num>=0){
 524             AVStream *st = s->streams[stream_num];
 525             if (!st->codec->bit_rate)
 526                 st->codec->bit_rate = bitrate[i];
 527             if (dar[i].num > 0 && dar[i].den > 0)
 528                 av_reduce(&st->sample_aspect_ratio.num,
 529                           &st->sample_aspect_ratio.den,
 530                           dar[i].num, dar[i].den, INT_MAX);
 531 //av_log(NULL, 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);
 532         }
 533     }
 534
 535     return 0;
 536 }
 537
 538 #define DO_2BITS(bits, var, defval) \
 539     switch (bits & 3) \
 540     { \
 541     case 3: var = get_le32(pb); rsize += 4; break; \
 542     case 2: var = get_le16(pb); rsize += 2; break; \
 543     case 1: var = get_byte(pb); rsize++; break; \
 544     default: var = defval; break; \
 545     }
 546
 547 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 548 {
 549     ASFContext *asf = s->priv_data;
 550     uint32_t packet_length, padsize;
 551     int rsize = 8;
 552     int c, d, e, off;
 553
 554     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
 555
 556     c=d=e=-1;
 557     while(off-- > 0){
 558         c=d; d=e;
 559         e= get_byte(pb);
 560         if(c == 0x82 && !d && !e)
 561             break;
 562     }
 563
 564     if (c != 0x82) {
 565         if (!url_feof(pb))
 566             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 567     }
 568     if ((c & 0x8f) == 0x82) {
 569         if (d || e) {
 570             if (!url_feof(pb))
 571                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 572             return -1;
 573         }
 574         c= get_byte(pb);
 575         d= get_byte(pb);
 576         rsize+=3;
 577     }else{
 578         url_fseek(pb, -1, SEEK_CUR); //FIXME
 579     }
 580
 581     asf->packet_flags    = c;
 582     asf->packet_property = d;
 583
 584     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 585     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 586     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 587
 588     //the following checks prevent overflows and infinite loops
 589     if(packet_length >= (1U<<29)){
 590         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 591         return -1;
 592     }
 593     if(padsize >= packet_length){
 594         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 595         return -1;
 596     }
 597
 598     asf->packet_timestamp = get_le32(pb);
 599     get_le16(pb); /* duration */
 600     // rsize has at least 11 bytes which have to be present
 601
 602     if (asf->packet_flags & 0x01) {
 603         asf->packet_segsizetype = get_byte(pb); rsize++;
 604         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 605     } else {
 606         asf->packet_segments = 1;
 607         asf->packet_segsizetype = 0x80;
 608     }
 609     asf->packet_size_left = packet_length - padsize - rsize;
 610     if (packet_length < asf->hdr.min_pktsize)
 611         padsize += asf->hdr.min_pktsize - packet_length;
 612     asf->packet_padsize = padsize;
 613     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 614     return 0;
 615 }
 616
 617 /**
 618  *
 619  * @return <0 if error
 620  */
 621 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 622     ASFContext *asf = s->priv_data;
 623     int rsize = 1;
 624     int num = get_byte(pb);
 625     int64_t ts0, ts1;
 626
 627     asf->packet_segments--;
 628     asf->packet_key_frame = num >> 7;
 629     asf->stream_index = asf->asfid2avid[num & 0x7f];
 630     // sequence should be ignored!
 631     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 632     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 633     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 634 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
 635     if (asf->packet_replic_size >= 8) {
 636         asf->packet_obj_size = get_le32(pb);
 637         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 638             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 639             return -1;
 640         }
 641         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 642         if(asf->packet_replic_size >= 8+38+4){
 643 //            for(i=0; i<asf->packet_replic_size-8; i++)
 644 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 645 //            av_log(s, AV_LOG_DEBUG, "\n");
 646             url_fskip(pb, 10);
 647             ts0= get_le64(pb);
 648             ts1= get_le64(pb);
 649             url_fskip(pb, 12);
 650             get_le32(pb);
 651             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 652             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 653             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 654         }else
 655             url_fskip(pb, asf->packet_replic_size - 8);
 656         rsize += asf->packet_replic_size; // FIXME - check validity
 657     } else if (asf->packet_replic_size==1){
 658         // multipacket - frag_offset is beginning timestamp
 659         asf->packet_time_start = asf->packet_frag_offset;
 660         asf->packet_frag_offset = 0;
 661         asf->packet_frag_timestamp = asf->packet_timestamp;
 662
 663         asf->packet_time_delta = get_byte(pb);
 664         rsize++;
 665     }else if(asf->packet_replic_size!=0){
 666         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 667         return -1;
 668     }
 669     if (asf->packet_flags & 0x01) {
 670         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 671         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 672             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 673             return -1;
 674         }
 675         //printf("Fragsize %d\n", asf->packet_frag_size);
 676     } else {
 677         asf->packet_frag_size = asf->packet_size_left - rsize;
 678         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 679     }
 680     if (asf->packet_replic_size == 1) {
 681         asf->packet_multi_size = asf->packet_frag_size;
 682         if (asf->packet_multi_size > asf->packet_size_left)
 683             return -1;
 684     }
 685     asf->packet_size_left -= rsize;
 686     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 687
 688     return 0;
 689 }
 690
 691 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 692 {
 693     ASFContext *asf = s->priv_data;
 694     ASFStream *asf_st = 0;
 695     for (;;) {
 696         if(url_feof(pb))
 697             return AVERROR(EIO);
 698         if (asf->packet_size_left < FRAME_HEADER_SIZE
 699             || asf->packet_segments < 1) {
 700             //asf->packet_size_left <= asf->packet_padsize) {
 701             int ret = asf->packet_size_left + asf->packet_padsize;
 702             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 703             assert(ret>=0);
 704             /* fail safe */
 705             url_fskip(pb, ret);
 706
 707             asf->packet_pos= url_ftell(pb);
 708             if (asf->data_object_size != (uint64_t)-1 &&
 709                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 710                 return AVERROR(EIO); /* Do not exceed the size of the data object */
 711             return 1;
 712         }
 713         if (asf->packet_time_start == 0) {
 714             if(asf_read_frame_header(s, pb) < 0){
 715                 asf->packet_segments= 0;
 716                 continue;
 717             }
 718             if (asf->stream_index < 0
 719                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 720                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 721                 ) {
 722                 asf->packet_time_start = 0;
 723                 /* unhandled packet (should not happen) */
 724                 url_fskip(pb, asf->packet_frag_size);
 725                 asf->packet_size_left -= asf->packet_frag_size;
 726                 if(asf->stream_index < 0)
 727                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 728                 continue;
 729             }
 730             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 731         }
 732         asf_st = asf->asf_st;
 733
 734         if (asf->packet_replic_size == 1) {
 735             // frag_offset is here used as the beginning timestamp
 736             asf->packet_frag_timestamp = asf->packet_time_start;
 737             asf->packet_time_start += asf->packet_time_delta;
 738             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 739             asf->packet_size_left--;
 740             asf->packet_multi_size--;
 741             if (asf->packet_multi_size < asf->packet_obj_size)
 742             {
 743                 asf->packet_time_start = 0;
 744                 url_fskip(pb, asf->packet_multi_size);
 745                 asf->packet_size_left -= asf->packet_multi_size;
 746                 continue;
 747             }
 748             asf->packet_multi_size -= asf->packet_obj_size;
 749             //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);
 750         }
 751         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 752               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 753            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 754             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 755                 asf_st->frag_offset, asf->packet_frag_size,
 756                 asf->packet_obj_size, asf_st->pkt.size);
 757             asf->packet_obj_size= asf_st->pkt.size;
 758         }
 759
 760         if (   asf_st->pkt.size != asf->packet_obj_size
 761             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 762             if(asf_st->pkt.data){
 763                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 764                 asf_st->frag_offset = 0;
 765                 av_free_packet(&asf_st->pkt);
 766             }
 767             /* new packet */
 768             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 769             asf_st->seq = asf->packet_seq;
 770             asf_st->pkt.dts = asf->packet_frag_timestamp;
 771             asf_st->pkt.stream_index = asf->stream_index;
 772             asf_st->pkt.pos =
 773             asf_st->packet_pos= asf->packet_pos;
 774 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 775 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 776 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 777             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 778                 asf->packet_key_frame = 1;
 779             if (asf->packet_key_frame)
 780                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 781         }
 782
 783         /* read data */
 784         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 785         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 786         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 787         asf->packet_size_left -= asf->packet_frag_size;
 788         if (asf->packet_size_left < 0)
 789             continue;
 790
 791         if(   asf->packet_frag_offset >= asf_st->pkt.size
 792            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 793             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 794                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 795             continue;
 796         }
 797
 798         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 799                    asf->packet_frag_size);
 800         if (s->key && s->keylen == 20)
 801             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 802                             asf->packet_frag_size);
 803         asf_st->frag_offset += asf->packet_frag_size;
 804         /* test if whole packet is read */
 805         if (asf_st->frag_offset == asf_st->pkt.size) {
 806             //workaround for macroshit radio DVR-MS files
 807             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 808                && asf_st->pkt.size > 100){
 809                 int i;
 810                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 811                 if(i == asf_st->pkt.size){
 812                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 813                     asf_st->frag_offset = 0;
 814                     av_free_packet(&asf_st->pkt);
 815                     continue;
 816                 }
 817             }
 818
 819             /* return packet */
 820             if (asf_st->ds_span > 1) {
 821               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 822                     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);
 823               }else{
 824                 /* packet descrambling */
 825                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 826                 if (newdata) {
 827                     int offset = 0;
 828                     while (offset < asf_st->pkt.size) {
 829                         int off = offset / asf_st->ds_chunk_size;
 830                         int row = off / asf_st->ds_span;
 831                         int col = off % asf_st->ds_span;
 832                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 833                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 834
 835                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 836                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 837                         memcpy(newdata + offset,
 838                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 839                                asf_st->ds_chunk_size);
 840                         offset += asf_st->ds_chunk_size;
 841                     }
 842                     av_free(asf_st->pkt.data);
 843                     asf_st->pkt.data = newdata;
 844                 }
 845               }
 846             }
 847             asf_st->frag_offset = 0;
 848             *pkt= asf_st->pkt;
 849             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 850             asf_st->pkt.size = 0;
 851             asf_st->pkt.data = 0;
 852             break; // packet completed
 853         }
 854     }
 855     return 0;
 856 }
 857
 858 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 859 {
 860     ASFContext *asf = s->priv_data;
 861
 862     for (;;) {
 863         int ret;
 864
 865         /* parse cached packets, if any */
 866         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
 867             return ret;
 868         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
 869             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
 870         asf->packet_time_start = 0;
 871     }
 872
 873     return 0;
 874 }
 875
 876 // Added to support seeking after packets have been read
 877 // If information is not reset, read_packet fails due to
 878 // leftover information from previous reads
 879 static void asf_reset_header(AVFormatContext *s)
 880 {
 881     ASFContext *asf = s->priv_data;
 882     ASFStream *asf_st;
 883     int i;
 884
 885     asf->packet_nb_frames = 0;
 886     asf->packet_size_left = 0;
 887     asf->packet_segments = 0;
 888     asf->packet_flags = 0;
 889     asf->packet_property = 0;
 890     asf->packet_timestamp = 0;
 891     asf->packet_segsizetype = 0;
 892     asf->packet_segments = 0;
 893     asf->packet_seq = 0;
 894     asf->packet_replic_size = 0;
 895     asf->packet_key_frame = 0;
 896     asf->packet_padsize = 0;
 897     asf->packet_frag_offset = 0;
 898     asf->packet_frag_size = 0;
 899     asf->packet_frag_timestamp = 0;
 900     asf->packet_multi_size = 0;
 901     asf->packet_obj_size = 0;
 902     asf->packet_time_delta = 0;
 903     asf->packet_time_start = 0;
 904
 905     for(i=0; i<s->nb_streams; i++){
 906         asf_st= s->streams[i]->priv_data;
 907         av_free_packet(&asf_st->pkt);
 908         asf_st->frag_offset=0;
 909         asf_st->seq=0;
 910     }
 911     asf->asf_st= NULL;
 912 }
 913
 914 static int asf_read_close(AVFormatContext *s)
 915 {
 916     int i;
 917
 918     asf_reset_header(s);
 919     for(i=0;i<s->nb_streams;i++) {
 920         AVStream *st = s->streams[i];
 921         av_free(st->codec->palctrl);
 922     }
 923     return 0;
 924 }
 925
 926 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 927 {
 928     ASFContext *asf = s->priv_data;
 929     AVPacket pkt1, *pkt = &pkt1;
 930     ASFStream *asf_st;
 931     int64_t pts;
 932     int64_t pos= *ppos;
 933     int i;
 934     int64_t start_pos[s->nb_streams];
 935
 936     for(i=0; i<s->nb_streams; i++){
 937         start_pos[i]= pos;
 938     }
 939
 940     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 941     *ppos= pos;
 942     url_fseek(s->pb, pos, SEEK_SET);
 943
 944 //printf("asf_read_pts\n");
 945     asf_reset_header(s);
 946     for(;;){
 947         if (av_read_frame(s, pkt) < 0){
 948             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
 949             return AV_NOPTS_VALUE;
 950         }
 951
 952         pts= pkt->pts;
 953
 954         av_free_packet(pkt);
 955         if(pkt->flags&PKT_FLAG_KEY){
 956             i= pkt->stream_index;
 957
 958             asf_st= s->streams[i]->priv_data;
 959
 960 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 961             pos= asf_st->packet_pos;
 962
 963             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 964             start_pos[i]= asf_st->packet_pos + 1;
 965
 966             if(pkt->stream_index == stream_index)
 967                break;
 968         }
 969     }
 970
 971     *ppos= pos;
 972 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 973
 974     return pts;
 975 }
 976
 977 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 978 {
 979     GUID g;
 980     ASFContext *asf = s->priv_data;
 981     int64_t gsize, itime;
 982     int64_t pos, current_pos, index_pts;
 983     int i;
 984     int pct,ict;
 985
 986     current_pos = url_ftell(s->pb);
 987
 988     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 989     get_guid(s->pb, &g);
 990     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 991         gsize = get_le64(s->pb);
 992         get_guid(s->pb, &g);
 993         itime=get_le64(s->pb);
 994         pct=get_le32(s->pb);
 995         ict=get_le32(s->pb);
 996         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
 997
 998         for (i=0;i<ict;i++){
 999             int pktnum=get_le32(s->pb);
1000             int pktct =get_le16(s->pb);
1001             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1002
1003             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1004             index_pts=av_rescale(itime, i, 10000);
1005
1006             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1007         }
1008         asf->index_read= 1;
1009     }
1010     url_fseek(s->pb, current_pos, SEEK_SET);
1011 }
1012
1013 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1014 {
1015     ASFContext *asf = s->priv_data;
1016     AVStream *st = s->streams[stream_index];
1017     int64_t pos;
1018     int index;
1019
1020     if (asf->packet_size <= 0)
1021         return -1;
1022
1023     /* Try using the protocol's read_seek if available */
1024     if(s->pb) {
1025         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1026         if(ret >= 0)
1027             asf_reset_header(s);
1028         if (ret != AVERROR(ENOSYS))
1029             return ret;
1030     }
1031
1032     if (!asf->index_read)
1033         asf_build_simple_index(s, stream_index);
1034
1035     if(!(asf->index_read && st->index_entries)){
1036         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1037             return -1;
1038     }else{
1039         index= av_index_search_timestamp(st, pts, flags);
1040         if(index<0)
1041             return -1;
1042
1043         /* find the position */
1044         pos = st->index_entries[index].pos;
1045         pts = st->index_entries[index].timestamp;
1046
1047     // various attempts to find key frame have failed so far
1048     //    asf_reset_header(s);
1049     //    url_fseek(s->pb, pos, SEEK_SET);
1050     //    key_pos = pos;
1051     //     for(i=0;i<16;i++){
1052     //         pos = url_ftell(s->pb);
1053     //         if (av_read_frame(s, &pkt) < 0){
1054     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1055     //             return -1;
1056     //         }
1057     //         asf_st = s->streams[stream_index]->priv_data;
1058     //         pos += st->parser->frame_offset;
1059     //
1060     //         if (pkt.size > b) {
1061     //             b = pkt.size;
1062     //             key_pos = pos;
1063     //         }
1064     //
1065     //         av_free_packet(&pkt);
1066     //     }
1067
1068         /* do the seek */
1069         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1070         url_fseek(s->pb, pos, SEEK_SET);
1071     }
1072     asf_reset_header(s);
1073     return 0;
1074 }
1075
1076 AVInputFormat asf_demuxer = {
1077     "asf",
1078     NULL_IF_CONFIG_SMALL("ASF format"),
1079     sizeof(ASFContext),
1080     asf_probe,
1081     asf_read_header,
1082     asf_read_packet,
1083     asf_read_close,
1084     asf_read_seek,
1085     asf_read_pts,
1086 };