git.sesse.net Git - ffmpeg/blob - 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 //#define DEBUG
  23
  24 #include "libavutil/common.h"
  25 #include "libavutil/avstring.h"
  26 #include "libavcodec/mpegaudio.h"
  27 #include "avformat.h"
  28 #include "riff.h"
  29 #include "asf.h"
  30 #include "asfcrypt.h"
  31 #include "avlanguage.h"
  32
  33 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
  34
  35 typedef struct {
  36     int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID
  37     ASFStream streams[128];              ///< it's max number and it's not that big
  38     uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)
  39     AVRational dar[128];
  40     char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)
  41     /* non streamed additonnal info */
  42     /* packet filling */
  43     int packet_size_left;
  44     /* only for reading */
  45     uint64_t data_offset;                ///< beginning of the first data packet
  46     uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)
  47     uint64_t data_object_size;           ///< size of the data object
  48     int index_read;
  49
  50     ASFMainHeader hdr;
  51
  52     int packet_flags;
  53     int packet_property;
  54     int packet_timestamp;
  55     int packet_segsizetype;
  56     int packet_segments;
  57     int packet_seq;
  58     int packet_replic_size;
  59     int packet_key_frame;
  60     int packet_padsize;
  61     unsigned int packet_frag_offset;
  62     unsigned int packet_frag_size;
  63     int64_t packet_frag_timestamp;
  64     int packet_multi_size;
  65     int packet_obj_size;
  66     int packet_time_delta;
  67     int packet_time_start;
  68     int64_t packet_pos;
  69
  70     int stream_index;
  71
  72     ASFStream* asf_st;                   ///< currently decoded stream
  73 } ASFContext;
  74
  75 #undef NDEBUG
  76 #include <assert.h>
  77
  78 #define ASF_MAX_STREAMS 127
  79 #define FRAME_HEADER_SIZE 17
  80 // Fix Me! FRAME_HEADER_SIZE may be different.
  81
  82 static const ff_asf_guid index_guid = {
  83     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  84 };
  85
  86 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
  87     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  88 };
  89 /**********************************/
  90 /* decoding */
  91
  92 #ifdef DEBUG
  93 #define PRINT_IF_GUID(g,cmp) \
  94 if (!ff_guidcmp(g, &cmp)) \
  95     av_dlog(NULL, "(GUID: %s) ", #cmp)
  96
  97 static void print_guid(const ff_asf_guid *g)
  98 {
  99     int i;
 100     PRINT_IF_GUID(g, ff_asf_header);
 101     else PRINT_IF_GUID(g, ff_asf_file_header);
 102     else PRINT_IF_GUID(g, ff_asf_stream_header);
 103     else PRINT_IF_GUID(g, ff_asf_audio_stream);
 104     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
 105     else PRINT_IF_GUID(g, ff_asf_video_stream);
 106     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
 107     else PRINT_IF_GUID(g, ff_asf_command_stream);
 108     else PRINT_IF_GUID(g, ff_asf_comment_header);
 109     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
 110     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
 111     else PRINT_IF_GUID(g, ff_asf_data_header);
 112     else PRINT_IF_GUID(g, index_guid);
 113     else PRINT_IF_GUID(g, ff_asf_head1_guid);
 114     else PRINT_IF_GUID(g, ff_asf_head2_guid);
 115     else PRINT_IF_GUID(g, ff_asf_my_guid);
 116     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
 117     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
 118     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
 119     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
 120     else PRINT_IF_GUID(g, ff_asf_metadata_header);
 121     else PRINT_IF_GUID(g, ff_asf_marker_header);
 122     else PRINT_IF_GUID(g, stream_bitrate_guid);
 123     else PRINT_IF_GUID(g, ff_asf_language_guid);
 124     else
 125         av_dlog(NULL, "(GUID: unknown) ");
 126     for(i=0;i<16;i++)
 127         av_dlog(NULL, " 0x%02x,", (*g)[i]);
 128     av_dlog(NULL, "}\n");
 129 }
 130 #undef PRINT_IF_GUID
 131 #else
 132 #define print_guid(g)
 133 #endif
 134
 135 void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
 136 {
 137     assert(sizeof(*g) == 16);
 138     get_buffer(s, *g, sizeof(*g));
 139 }
 140
 141 static int asf_probe(AVProbeData *pd)
 142 {
 143     /* check file header */
 144     if (!ff_guidcmp(pd->buf, &ff_asf_header))
 145         return AVPROBE_SCORE_MAX;
 146     else
 147         return 0;
 148 }
 149
 150 static int get_value(ByteIOContext *pb, int type){
 151     switch(type){
 152         case 2: return get_le32(pb);
 153         case 3: return get_le32(pb);
 154         case 4: return get_le64(pb);
 155         case 5: return get_le16(pb);
 156         default:return INT_MIN;
 157     }
 158 }
 159
 160 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 161 {
 162     char *value;
 163     int64_t off = url_ftell(s->pb);
 164
 165     if ((unsigned)len >= (UINT_MAX - 1)/2)
 166         return;
 167
 168     value = av_malloc(2*len+1);
 169     if (!value)
 170         goto finish;
 171
 172     if (type == 0) {         // UTF16-LE
 173         avio_get_str16le(s->pb, len, value, 2*len + 1);
 174     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
 175         uint64_t num = get_value(s->pb, type);
 176         snprintf(value, len, "%"PRIu64, num);
 177     } else {
 178         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
 179         goto finish;
 180     }
 181     av_metadata_set2(&s->metadata, key, value, 0);
 182 finish:
 183     av_freep(&value);
 184     url_fseek(s->pb, off + len, SEEK_SET);
 185 }
 186
 187 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 188 {
 189     ASFContext *asf = s->priv_data;
 190     ff_asf_guid g;
 191     ByteIOContext *pb = s->pb;
 192     AVStream *st;
 193     ASFStream *asf_st;
 194     int size, i;
 195     int64_t gsize;
 196     uint32_t bitrate[128];
 197
 198     memset(bitrate, 0, sizeof(bitrate));
 199
 200     ff_get_guid(pb, &g);
 201     if (ff_guidcmp(&g, &ff_asf_header))
 202         return -1;
 203     get_le64(pb);
 204     get_le32(pb);
 205     get_byte(pb);
 206     get_byte(pb);
 207     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 208     for(;;) {
 209         uint64_t gpos= url_ftell(pb);
 210         int ret;
 211         ff_get_guid(pb, &g);
 212         gsize = get_le64(pb);
 213         av_dlog(s, "%08"PRIx64": ", gpos);
 214         print_guid(&g);
 215         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
 216         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
 217             asf->data_object_offset = url_ftell(pb);
 218             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 219             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 220                 asf->data_object_size = gsize - 24;
 221             } else {
 222                 asf->data_object_size = (uint64_t)-1;
 223             }
 224             break;
 225         }
 226         if (gsize < 24)
 227             return -1;
 228         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
 229             ff_get_guid(pb, &asf->hdr.guid);
 230             asf->hdr.file_size          = get_le64(pb);
 231             asf->hdr.create_time        = get_le64(pb);
 232             get_le64(pb);                               /* number of packets */
 233             asf->hdr.play_time          = get_le64(pb);
 234             asf->hdr.send_time          = get_le64(pb);
 235             asf->hdr.preroll            = get_le32(pb);
 236             asf->hdr.ignore             = get_le32(pb);
 237             asf->hdr.flags              = get_le32(pb);
 238             asf->hdr.min_pktsize        = get_le32(pb);
 239             asf->hdr.max_pktsize        = get_le32(pb);
 240             asf->hdr.max_bitrate        = get_le32(pb);
 241             s->packet_size = asf->hdr.max_pktsize;
 242         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
 243             enum AVMediaType type;
 244             int type_specific_size, sizeX;
 245             uint64_t total_size;
 246             unsigned int tag1;
 247             int64_t pos1, pos2, start_time;
 248             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 249
 250             if (s->nb_streams == ASF_MAX_STREAMS) {
 251                 av_log(s, AV_LOG_ERROR, "too many streams\n");
 252                 return AVERROR(EINVAL);
 253             }
 254
 255             pos1 = url_ftell(pb);
 256
 257             st = av_new_stream(s, 0);
 258             if (!st)
 259                 return AVERROR(ENOMEM);
 260             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 261             asf_st = av_mallocz(sizeof(ASFStream));
 262             if (!asf_st)
 263                 return AVERROR(ENOMEM);
 264             st->priv_data = asf_st;
 265             start_time = asf->hdr.preroll;
 266
 267             asf_st->stream_language_index = 128; // invalid stream index means no language info
 268
 269             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 270                 st->duration = asf->hdr.play_time /
 271                     (10000000 / 1000) - start_time;
 272             }
 273             ff_get_guid(pb, &g);
 274
 275             test_for_ext_stream_audio = 0;
 276             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
 277                 type = AVMEDIA_TYPE_AUDIO;
 278             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
 279                 type = AVMEDIA_TYPE_VIDEO;
 280             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
 281                 type = AVMEDIA_TYPE_VIDEO;
 282                 st->codec->codec_id = CODEC_ID_MJPEG;
 283             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
 284                 type = AVMEDIA_TYPE_DATA;
 285             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 286                 test_for_ext_stream_audio = 1;
 287                 type = AVMEDIA_TYPE_UNKNOWN;
 288             } else {
 289                 return -1;
 290             }
 291             ff_get_guid(pb, &g);
 292             total_size = get_le64(pb);
 293             type_specific_size = get_le32(pb);
 294             get_le32(pb);
 295             st->id = get_le16(pb) & 0x7f; /* stream id */
 296             // mapping of asf ID to AV stream ID;
 297             asf->asfid2avid[st->id] = s->nb_streams - 1;
 298
 299             get_le32(pb);
 300
 301             if (test_for_ext_stream_audio) {
 302                 ff_get_guid(pb, &g);
 303                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 304                     type = AVMEDIA_TYPE_AUDIO;
 305                     is_dvr_ms_audio=1;
 306                     ff_get_guid(pb, &g);
 307                     get_le32(pb);
 308                     get_le32(pb);
 309                     get_le32(pb);
 310                     ff_get_guid(pb, &g);
 311                     get_le32(pb);
 312                 }
 313             }
 314
 315             st->codec->codec_type = type;
 316             if (type == AVMEDIA_TYPE_AUDIO) {
 317                 ff_get_wav_header(pb, st->codec, type_specific_size);
 318                 if (is_dvr_ms_audio) {
 319                     // codec_id and codec_tag are unreliable in dvr_ms
 320                     // files. Set them later by probing stream.
 321                     st->codec->codec_id = CODEC_ID_PROBE;
 322                     st->codec->codec_tag = 0;
 323                 }
 324                 if (st->codec->codec_id == CODEC_ID_AAC) {
 325                     st->need_parsing = AVSTREAM_PARSE_NONE;
 326                 } else {
 327                     st->need_parsing = AVSTREAM_PARSE_FULL;
 328                 }
 329                 /* We have to init the frame size at some point .... */
 330                 pos2 = url_ftell(pb);
 331                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 332                     asf_st->ds_span = get_byte(pb);
 333                     asf_st->ds_packet_size = get_le16(pb);
 334                     asf_st->ds_chunk_size = get_le16(pb);
 335                     get_le16(pb); //ds_data_size
 336                     get_byte(pb); //ds_silence_data
 337                 }
 338                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 339                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 340                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 341                 if (asf_st->ds_span > 1) {
 342                     if (!asf_st->ds_chunk_size
 343                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 344                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 345                         asf_st->ds_span = 0; // disable descrambling
 346                 }
 347                 switch (st->codec->codec_id) {
 348                 case CODEC_ID_MP3:
 349                     st->codec->frame_size = MPA_FRAME_SIZE;
 350                     break;
 351                 case CODEC_ID_PCM_S16LE:
 352                 case CODEC_ID_PCM_S16BE:
 353                 case CODEC_ID_PCM_U16LE:
 354                 case CODEC_ID_PCM_U16BE:
 355                 case CODEC_ID_PCM_S8:
 356                 case CODEC_ID_PCM_U8:
 357                 case CODEC_ID_PCM_ALAW:
 358                 case CODEC_ID_PCM_MULAW:
 359                     st->codec->frame_size = 1;
 360                     break;
 361                 default:
 362                     /* This is probably wrong, but it prevents a crash later */
 363                     st->codec->frame_size = 1;
 364                     break;
 365                 }
 366             } else if (type == AVMEDIA_TYPE_VIDEO &&
 367                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
 368                 get_le32(pb);
 369                 get_le32(pb);
 370                 get_byte(pb);
 371                 size = get_le16(pb); /* size */
 372                 sizeX= get_le32(pb); /* size */
 373                 st->codec->width = get_le32(pb);
 374                 st->codec->height = get_le32(pb);
 375                 /* not available for asf */
 376                 get_le16(pb); /* panes */
 377                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 378                 tag1 = get_le32(pb);
 379                 url_fskip(pb, 20);
 380 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 381                 size= sizeX;
 382                 if (size > 40) {
 383                     st->codec->extradata_size = size - 40;
 384                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 385                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 386                 }
 387
 388                 /* Extract palette from extradata if bpp <= 8 */
 389                 /* This code assumes that extradata contains only palette */
 390                 /* This is true for all paletted codecs implemented in ffmpeg */
 391                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 392                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 393 #if HAVE_BIGENDIAN
 394                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 395                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
 396 #else
 397                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 398                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 399 #endif
 400                     st->codec->palctrl->palette_changed = 1;
 401                 }
 402
 403                 st->codec->codec_tag = tag1;
 404                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
 405                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
 406                     st->need_parsing = AVSTREAM_PARSE_FULL;
 407                     // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
 408                     st->codec->width  =
 409                     st->codec->height = 0;
 410                     av_freep(&st->codec->extradata);
 411                     st->codec->extradata_size=0;
 412                 }
 413                 if(st->codec->codec_id == CODEC_ID_H264)
 414                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
 415             }
 416             pos2 = url_ftell(pb);
 417             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 418         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
 419             int len1, len2, len3, len4, len5;
 420
 421             len1 = get_le16(pb);
 422             len2 = get_le16(pb);
 423             len3 = get_le16(pb);
 424             len4 = get_le16(pb);
 425             len5 = get_le16(pb);
 426             get_tag(s, "title"    , 0, len1);
 427             get_tag(s, "author"   , 0, len2);
 428             get_tag(s, "copyright", 0, len3);
 429             get_tag(s, "comment"  , 0, len4);
 430             url_fskip(pb, len5);
 431         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
 432             int stream_count = get_le16(pb);
 433             int j;
 434
 435 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 436 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 437             for(j = 0; j < stream_count; j++) {
 438                 int flags, bitrate, stream_id;
 439
 440                 flags= get_le16(pb);
 441                 bitrate= get_le32(pb);
 442                 stream_id= (flags & 0x7f);
 443 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 444                 asf->stream_bitrates[stream_id]= bitrate;
 445             }
 446         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
 447             int j;
 448             int stream_count = get_le16(pb);
 449             for(j = 0; j < stream_count; j++) {
 450                 char lang[6];
 451                 unsigned int lang_len = get_byte(pb);
 452                 if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
 453                     url_fskip(pb, lang_len - ret);
 454                 if (j < 128)
 455                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 456             }
 457         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
 458             int desc_count, i;
 459
 460             desc_count = get_le16(pb);
 461             for(i=0;i<desc_count;i++) {
 462                     int name_len,value_type,value_len;
 463                     char name[1024];
 464
 465                     name_len = get_le16(pb);
 466                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 467                         name_len += 1;
 468                     if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
 469                         url_fskip(pb, name_len - ret);
 470                     value_type = get_le16(pb);
 471                     value_len  = get_le16(pb);
 472                     if (!value_type && value_len%2)
 473                         value_len += 1;
 474                     /**
 475                      * My sample has that stream set to 0 maybe that mean the container.
 476                      * Asf stream count start at 1. I am using 0 to the container value since it's unused
 477                      */
 478                     if (!strcmp(name, "AspectRatioX")){
 479                         asf->dar[0].num= get_value(s->pb, value_type);
 480                     } else if(!strcmp(name, "AspectRatioY")){
 481                         asf->dar[0].den= get_value(s->pb, value_type);
 482                     } else
 483                         get_tag(s, name, value_type, value_len);
 484             }
 485         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
 486             int n, stream_num, name_len, value_len, value_type, value_num;
 487             n = get_le16(pb);
 488
 489             for(i=0;i<n;i++) {
 490                 char name[1024];
 491
 492                 get_le16(pb); //lang_list_index
 493                 stream_num= get_le16(pb);
 494                 name_len=   get_le16(pb);
 495                 value_type= get_le16(pb);
 496                 value_len=  get_le32(pb);
 497
 498                 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
 499                     url_fskip(pb, name_len - ret);
 500 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 501                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 502                 url_fskip(pb, value_len - 2);
 503
 504                 if(stream_num<128){
 505                     if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
 506                     else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
 507                 }
 508             }
 509         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
 510             int ext_len, payload_ext_ct, stream_ct;
 511             uint32_t ext_d, leak_rate, stream_num;
 512             unsigned int stream_languageid_index;
 513
 514             get_le64(pb); // starttime
 515             get_le64(pb); // endtime
 516             leak_rate = get_le32(pb); // leak-datarate
 517             get_le32(pb); // bucket-datasize
 518             get_le32(pb); // init-bucket-fullness
 519             get_le32(pb); // alt-leak-datarate
 520             get_le32(pb); // alt-bucket-datasize
 521             get_le32(pb); // alt-init-bucket-fullness
 522             get_le32(pb); // max-object-size
 523             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 524             stream_num = get_le16(pb); // stream-num
 525
 526             stream_languageid_index = get_le16(pb); // stream-language-id-index
 527             if (stream_num < 128)
 528                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 529
 530             get_le64(pb); // avg frametime in 100ns units
 531             stream_ct = get_le16(pb); //stream-name-count
 532             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 533
 534             if (stream_num < 128)
 535                 bitrate[stream_num] = leak_rate;
 536
 537             for (i=0; i<stream_ct; i++){
 538                 get_le16(pb);
 539                 ext_len = get_le16(pb);
 540                 url_fseek(pb, ext_len, SEEK_CUR);
 541             }
 542
 543             for (i=0; i<payload_ext_ct; i++){
 544                 ff_get_guid(pb, &g);
 545                 ext_d=get_le16(pb);
 546                 ext_len=get_le32(pb);
 547                 url_fseek(pb, ext_len, SEEK_CUR);
 548             }
 549
 550             // there could be a optional stream properties object to follow
 551             // if so the next iteration will pick it up
 552             continue;
 553         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
 554             int v1, v2;
 555             ff_get_guid(pb, &g);
 556             v1 = get_le32(pb);
 557             v2 = get_le16(pb);
 558             continue;
 559         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
 560             int i, count, name_len;
 561             char name[1024];
 562
 563             get_le64(pb);            // reserved 16 bytes
 564             get_le64(pb);            // ...
 565             count = get_le32(pb);    // markers count
 566             get_le16(pb);            // reserved 2 bytes
 567             name_len = get_le16(pb); // name length
 568             for(i=0;i<name_len;i++){
 569                 get_byte(pb); // skip the name
 570             }
 571
 572             for(i=0;i<count;i++){
 573                 int64_t pres_time;
 574                 int name_len;
 575
 576                 get_le64(pb);             // offset, 8 bytes
 577                 pres_time = get_le64(pb); // presentation time
 578                 get_le16(pb);             // entry length
 579                 get_le32(pb);             // send time
 580                 get_le32(pb);             // flags
 581                 name_len = get_le32(pb);  // name length
 582                 if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
 583                     url_fskip(pb, name_len - ret);
 584                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
 585             }
 586         } else if (url_feof(pb)) {
 587             return -1;
 588         } else {
 589             if (!s->keylen) {
 590                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
 591                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 592                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
 593                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 594                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
 595                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 596                 }
 597             }
 598         }
 599         if(url_ftell(pb) != gpos + gsize)
 600             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
 601         url_fseek(pb, gpos + gsize, SEEK_SET);
 602     }
 603     ff_get_guid(pb, &g);
 604     get_le64(pb);
 605     get_byte(pb);
 606     get_byte(pb);
 607     if (url_feof(pb))
 608         return -1;
 609     asf->data_offset = url_ftell(pb);
 610     asf->packet_size_left = 0;
 611
 612
 613     for(i=0; i<128; i++){
 614         int stream_num= asf->asfid2avid[i];
 615         if(stream_num>=0){
 616             AVStream *st = s->streams[stream_num];
 617             if (!st->codec->bit_rate)
 618                 st->codec->bit_rate = bitrate[i];
 619             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
 620                 av_reduce(&st->sample_aspect_ratio.num,
 621                           &st->sample_aspect_ratio.den,
 622                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
 623             } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
 624                 av_reduce(&st->sample_aspect_ratio.num,
 625                           &st->sample_aspect_ratio.den,
 626                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
 627
 628 //av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
 629
 630             // copy and convert language codes to the frontend
 631             if (asf->streams[i].stream_language_index < 128) {
 632                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 633                 if (rfc1766 && strlen(rfc1766) > 1) {
 634                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 635                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 636                     if (iso6392)
 637                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
 638                 }
 639             }
 640         }
 641     }
 642
 643     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 644
 645     return 0;
 646 }
 647
 648 #define DO_2BITS(bits, var, defval) \
 649     switch (bits & 3) \
 650     { \
 651     case 3: var = get_le32(pb); rsize += 4; break; \
 652     case 2: var = get_le16(pb); rsize += 2; break; \
 653     case 1: var = get_byte(pb); rsize++; break; \
 654     default: var = defval; break; \
 655     }
 656
 657 /**
 658  * Load a single ASF packet into the demuxer.
 659  * @param s demux context
 660  * @param pb context to read data from
 661  * @return 0 on success, <0 on error
 662  */
 663 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 664 {
 665     ASFContext *asf = s->priv_data;
 666     uint32_t packet_length, padsize;
 667     int rsize = 8;
 668     int c, d, e, off;
 669
 670     // if we do not know packet size, allow skipping up to 32 kB
 671     off= 32768;
 672     if (s->packet_size > 0)
 673         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 674
 675     c=d=e=-1;
 676     while(off-- > 0){
 677         c=d; d=e;
 678         e= get_byte(pb);
 679         if(c == 0x82 && !d && !e)
 680             break;
 681     }
 682
 683     if (c != 0x82) {
 684         /**
 685          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 686          * if the packet sync code above triggers -EAGAIN). This does not
 687          * imply complete -EAGAIN handling support at random positions in
 688          * the stream.
 689          */
 690         if (url_ferror(pb) == AVERROR(EAGAIN))
 691             return AVERROR(EAGAIN);
 692         if (!url_feof(pb))
 693             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 694     }
 695     if ((c & 0x8f) == 0x82) {
 696         if (d || e) {
 697             if (!url_feof(pb))
 698                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 699             return -1;
 700         }
 701         c= get_byte(pb);
 702         d= get_byte(pb);
 703         rsize+=3;
 704     }else{
 705         url_fseek(pb, -1, SEEK_CUR); //FIXME
 706     }
 707
 708     asf->packet_flags    = c;
 709     asf->packet_property = d;
 710
 711     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 712     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 713     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 714
 715     //the following checks prevent overflows and infinite loops
 716     if(!packet_length || packet_length >= (1U<<29)){
 717         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 718         return -1;
 719     }
 720     if(padsize >= packet_length){
 721         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 722         return -1;
 723     }
 724
 725     asf->packet_timestamp = get_le32(pb);
 726     get_le16(pb); /* duration */
 727     // rsize has at least 11 bytes which have to be present
 728
 729     if (asf->packet_flags & 0x01) {
 730         asf->packet_segsizetype = get_byte(pb); rsize++;
 731         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 732     } else {
 733         asf->packet_segments = 1;
 734         asf->packet_segsizetype = 0x80;
 735     }
 736     asf->packet_size_left = packet_length - padsize - rsize;
 737     if (packet_length < asf->hdr.min_pktsize)
 738         padsize += asf->hdr.min_pktsize - packet_length;
 739     asf->packet_padsize = padsize;
 740     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 741     return 0;
 742 }
 743
 744 /**
 745  *
 746  * @return <0 if error
 747  */
 748 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 749     ASFContext *asf = s->priv_data;
 750     int rsize = 1;
 751     int num = get_byte(pb);
 752     int64_t ts0, ts1;
 753
 754     asf->packet_segments--;
 755     asf->packet_key_frame = num >> 7;
 756     asf->stream_index = asf->asfid2avid[num & 0x7f];
 757     // sequence should be ignored!
 758     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 759     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 760     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 761 //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);
 762     if (asf->packet_replic_size >= 8) {
 763         asf->packet_obj_size = get_le32(pb);
 764         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 765             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 766             return -1;
 767         }
 768         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 769         if(asf->packet_replic_size >= 8+38+4){
 770 //            for(i=0; i<asf->packet_replic_size-8; i++)
 771 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 772 //            av_log(s, AV_LOG_DEBUG, "\n");
 773             url_fskip(pb, 10);
 774             ts0= get_le64(pb);
 775             ts1= get_le64(pb);
 776             url_fskip(pb, 12);
 777             get_le32(pb);
 778             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 779             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 780             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 781         }else
 782             url_fskip(pb, asf->packet_replic_size - 8);
 783         rsize += asf->packet_replic_size; // FIXME - check validity
 784     } else if (asf->packet_replic_size==1){
 785         // multipacket - frag_offset is beginning timestamp
 786         asf->packet_time_start = asf->packet_frag_offset;
 787         asf->packet_frag_offset = 0;
 788         asf->packet_frag_timestamp = asf->packet_timestamp;
 789
 790         asf->packet_time_delta = get_byte(pb);
 791         rsize++;
 792     }else if(asf->packet_replic_size!=0){
 793         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 794         return -1;
 795     }
 796     if (asf->packet_flags & 0x01) {
 797         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 798         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 799             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 800             return -1;
 801         }
 802         //printf("Fragsize %d\n", asf->packet_frag_size);
 803     } else {
 804         asf->packet_frag_size = asf->packet_size_left - rsize;
 805         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 806     }
 807     if (asf->packet_replic_size == 1) {
 808         asf->packet_multi_size = asf->packet_frag_size;
 809         if (asf->packet_multi_size > asf->packet_size_left)
 810             return -1;
 811     }
 812     asf->packet_size_left -= rsize;
 813     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 814
 815     return 0;
 816 }
 817
 818 /**
 819  * Parse data from individual ASF packets (which were previously loaded
 820  * with asf_get_packet()).
 821  * @param s demux context
 822  * @param pb context to read data from
 823  * @param pkt pointer to store packet data into
 824  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
 825  *          packets need to be loaded (through asf_get_packet())
 826  */
 827 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 828 {
 829     ASFContext *asf = s->priv_data;
 830     ASFStream *asf_st = 0;
 831     for (;;) {
 832         int ret;
 833         if(url_feof(pb))
 834             return AVERROR_EOF;
 835         if (asf->packet_size_left < FRAME_HEADER_SIZE
 836             || asf->packet_segments < 1) {
 837             //asf->packet_size_left <= asf->packet_padsize) {
 838             int ret = asf->packet_size_left + asf->packet_padsize;
 839             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 840             assert(ret>=0);
 841             /* fail safe */
 842             url_fskip(pb, ret);
 843
 844             asf->packet_pos= url_ftell(pb);
 845             if (asf->data_object_size != (uint64_t)-1 &&
 846                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 847                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 848             return 1;
 849         }
 850         if (asf->packet_time_start == 0) {
 851             if(asf_read_frame_header(s, pb) < 0){
 852                 asf->packet_segments= 0;
 853                 continue;
 854             }
 855             if (asf->stream_index < 0
 856                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 857                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 858                 ) {
 859                 asf->packet_time_start = 0;
 860                 /* unhandled packet (should not happen) */
 861                 url_fskip(pb, asf->packet_frag_size);
 862                 asf->packet_size_left -= asf->packet_frag_size;
 863                 if(asf->stream_index < 0)
 864                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 865                 continue;
 866             }
 867             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 868         }
 869         asf_st = asf->asf_st;
 870
 871         if (asf->packet_replic_size == 1) {
 872             // frag_offset is here used as the beginning timestamp
 873             asf->packet_frag_timestamp = asf->packet_time_start;
 874             asf->packet_time_start += asf->packet_time_delta;
 875             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 876             asf->packet_size_left--;
 877             asf->packet_multi_size--;
 878             if (asf->packet_multi_size < asf->packet_obj_size)
 879             {
 880                 asf->packet_time_start = 0;
 881                 url_fskip(pb, asf->packet_multi_size);
 882                 asf->packet_size_left -= asf->packet_multi_size;
 883                 continue;
 884             }
 885             asf->packet_multi_size -= asf->packet_obj_size;
 886             //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);
 887         }
 888         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 889               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 890            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 891             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 892                 asf_st->frag_offset, asf->packet_frag_size,
 893                 asf->packet_obj_size, asf_st->pkt.size);
 894             asf->packet_obj_size= asf_st->pkt.size;
 895         }
 896
 897         if (   asf_st->pkt.size != asf->packet_obj_size
 898             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 899             if(asf_st->pkt.data){
 900                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 901                 asf_st->frag_offset = 0;
 902                 av_free_packet(&asf_st->pkt);
 903             }
 904             /* new packet */
 905             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 906             asf_st->seq = asf->packet_seq;
 907             asf_st->pkt.dts = asf->packet_frag_timestamp;
 908             asf_st->pkt.stream_index = asf->stream_index;
 909             asf_st->pkt.pos =
 910             asf_st->packet_pos= asf->packet_pos;
 911 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 912 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
 913 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
 914             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 915                 asf->packet_key_frame = 1;
 916             if (asf->packet_key_frame)
 917                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
 918         }
 919
 920         /* read data */
 921         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 922         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 923         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 924         asf->packet_size_left -= asf->packet_frag_size;
 925         if (asf->packet_size_left < 0)
 926             continue;
 927
 928         if(   asf->packet_frag_offset >= asf_st->pkt.size
 929            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 930             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 931                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 932             continue;
 933         }
 934
 935         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 936                          asf->packet_frag_size);
 937         if (ret != asf->packet_frag_size) {
 938             if (ret < 0 || asf->packet_frag_offset + ret == 0)
 939                 return ret < 0 ? ret : AVERROR_EOF;
 940             if (asf_st->ds_span > 1) {
 941                 // scrambling, we can either drop it completely or fill the remainder
 942                 // TODO: should we fill the whole packet instead of just the current
 943                 // fragment?
 944                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
 945                        asf->packet_frag_size - ret);
 946                 ret = asf->packet_frag_size;
 947             } else
 948                 // no scrambling, so we can return partial packets
 949                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
 950         }
 951         if (s->key && s->keylen == 20)
 952             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 953                             ret);
 954         asf_st->frag_offset += ret;
 955         /* test if whole packet is read */
 956         if (asf_st->frag_offset == asf_st->pkt.size) {
 957             //workaround for macroshit radio DVR-MS files
 958             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 959                && asf_st->pkt.size > 100){
 960                 int i;
 961                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 962                 if(i == asf_st->pkt.size){
 963                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 964                     asf_st->frag_offset = 0;
 965                     av_free_packet(&asf_st->pkt);
 966                     continue;
 967                 }
 968             }
 969
 970             /* return packet */
 971             if (asf_st->ds_span > 1) {
 972               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 973                     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);
 974               }else{
 975                 /* packet descrambling */
 976                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
 977                 if (newdata) {
 978                     int offset = 0;
 979                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 980                     while (offset < asf_st->pkt.size) {
 981                         int off = offset / asf_st->ds_chunk_size;
 982                         int row = off / asf_st->ds_span;
 983                         int col = off % asf_st->ds_span;
 984                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 985                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 986
 987                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 988                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 989                         memcpy(newdata + offset,
 990                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 991                                asf_st->ds_chunk_size);
 992                         offset += asf_st->ds_chunk_size;
 993                     }
 994                     av_free(asf_st->pkt.data);
 995                     asf_st->pkt.data = newdata;
 996                 }
 997               }
 998             }
 999             asf_st->frag_offset = 0;
1000             *pkt= asf_st->pkt;
1001             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
1002             asf_st->pkt.size = 0;
1003             asf_st->pkt.data = 0;
1004             break; // packet completed
1005         }
1006     }
1007     return 0;
1008 }
1009
1010 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1011 {
1012     ASFContext *asf = s->priv_data;
1013
1014     for (;;) {
1015         int ret;
1016
1017         /* parse cached packets, if any */
1018         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1019             return ret;
1020         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1021             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1022         asf->packet_time_start = 0;
1023     }
1024
1025     return 0;
1026 }
1027
1028 // Added to support seeking after packets have been read
1029 // If information is not reset, read_packet fails due to
1030 // leftover information from previous reads
1031 static void asf_reset_header(AVFormatContext *s)
1032 {
1033     ASFContext *asf = s->priv_data;
1034     ASFStream *asf_st;
1035     int i;
1036
1037     asf->packet_size_left = 0;
1038     asf->packet_segments = 0;
1039     asf->packet_flags = 0;
1040     asf->packet_property = 0;
1041     asf->packet_timestamp = 0;
1042     asf->packet_segsizetype = 0;
1043     asf->packet_segments = 0;
1044     asf->packet_seq = 0;
1045     asf->packet_replic_size = 0;
1046     asf->packet_key_frame = 0;
1047     asf->packet_padsize = 0;
1048     asf->packet_frag_offset = 0;
1049     asf->packet_frag_size = 0;
1050     asf->packet_frag_timestamp = 0;
1051     asf->packet_multi_size = 0;
1052     asf->packet_obj_size = 0;
1053     asf->packet_time_delta = 0;
1054     asf->packet_time_start = 0;
1055
1056     for(i=0; i<s->nb_streams; i++){
1057         asf_st= s->streams[i]->priv_data;
1058         av_free_packet(&asf_st->pkt);
1059         asf_st->frag_offset=0;
1060         asf_st->seq=0;
1061     }
1062     asf->asf_st= NULL;
1063 }
1064
1065 static int asf_read_close(AVFormatContext *s)
1066 {
1067     int i;
1068
1069     asf_reset_header(s);
1070     for(i=0;i<s->nb_streams;i++) {
1071         AVStream *st = s->streams[i];
1072         av_free(st->codec->palctrl);
1073     }
1074     return 0;
1075 }
1076
1077 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1078 {
1079     AVPacket pkt1, *pkt = &pkt1;
1080     ASFStream *asf_st;
1081     int64_t pts;
1082     int64_t pos= *ppos;
1083     int i;
1084     int64_t start_pos[ASF_MAX_STREAMS];
1085
1086     for(i=0; i<s->nb_streams; i++){
1087         start_pos[i]= pos;
1088     }
1089
1090     if (s->packet_size > 0)
1091         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1092     *ppos= pos;
1093     url_fseek(s->pb, pos, SEEK_SET);
1094
1095 //printf("asf_read_pts\n");
1096     asf_reset_header(s);
1097     for(;;){
1098         if (av_read_frame(s, pkt) < 0){
1099             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1100             return AV_NOPTS_VALUE;
1101         }
1102
1103         pts= pkt->pts;
1104
1105         av_free_packet(pkt);
1106         if(pkt->flags&AV_PKT_FLAG_KEY){
1107             i= pkt->stream_index;
1108
1109             asf_st= s->streams[i]->priv_data;
1110
1111 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1112             pos= asf_st->packet_pos;
1113
1114             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1115             start_pos[i]= asf_st->packet_pos + 1;
1116
1117             if(pkt->stream_index == stream_index)
1118                break;
1119         }
1120     }
1121
1122     *ppos= pos;
1123 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1124
1125     return pts;
1126 }
1127
1128 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1129 {
1130     ff_asf_guid g;
1131     ASFContext *asf = s->priv_data;
1132     int64_t current_pos= url_ftell(s->pb);
1133     int i;
1134
1135     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1136     ff_get_guid(s->pb, &g);
1137
1138     /* the data object can be followed by other top-level objects,
1139        skip them until the simple index object is reached */
1140     while (ff_guidcmp(&g, &index_guid)) {
1141         int64_t gsize= get_le64(s->pb);
1142         if (gsize < 24 || url_feof(s->pb)) {
1143             url_fseek(s->pb, current_pos, SEEK_SET);
1144             return;
1145         }
1146         url_fseek(s->pb, gsize-24, SEEK_CUR);
1147         ff_get_guid(s->pb, &g);
1148     }
1149
1150     {
1151         int64_t itime, last_pos=-1;
1152         int pct, ict;
1153         int64_t av_unused gsize= get_le64(s->pb);
1154         ff_get_guid(s->pb, &g);
1155         itime=get_le64(s->pb);
1156         pct=get_le32(s->pb);
1157         ict=get_le32(s->pb);
1158         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1159
1160         for (i=0;i<ict;i++){
1161             int pktnum=get_le32(s->pb);
1162             int pktct =get_le16(s->pb);
1163             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1164             int64_t index_pts= av_rescale(itime, i, 10000);
1165
1166             if(pos != last_pos){
1167             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1168             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1169             last_pos=pos;
1170             }
1171         }
1172         asf->index_read= 1;
1173     }
1174     url_fseek(s->pb, current_pos, SEEK_SET);
1175 }
1176
1177 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1178 {
1179     ASFContext *asf = s->priv_data;
1180     AVStream *st = s->streams[stream_index];
1181     int64_t pos;
1182     int index;
1183
1184     if (s->packet_size <= 0)
1185         return -1;
1186
1187     /* Try using the protocol's read_seek if available */
1188     if(s->pb) {
1189         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1190         if(ret >= 0)
1191             asf_reset_header(s);
1192         if (ret != AVERROR(ENOSYS))
1193             return ret;
1194     }
1195
1196     if (!asf->index_read)
1197         asf_build_simple_index(s, stream_index);
1198
1199     if(!(asf->index_read && st->index_entries)){
1200         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1201             return -1;
1202     }else{
1203         index= av_index_search_timestamp(st, pts, flags);
1204         if(index<0)
1205             return -1;
1206
1207         /* find the position */
1208         pos = st->index_entries[index].pos;
1209
1210     // various attempts to find key frame have failed so far
1211     //    asf_reset_header(s);
1212     //    url_fseek(s->pb, pos, SEEK_SET);
1213     //    key_pos = pos;
1214     //     for(i=0;i<16;i++){
1215     //         pos = url_ftell(s->pb);
1216     //         if (av_read_frame(s, &pkt) < 0){
1217     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1218     //             return -1;
1219     //         }
1220     //         asf_st = s->streams[stream_index]->priv_data;
1221     //         pos += st->parser->frame_offset;
1222     //
1223     //         if (pkt.size > b) {
1224     //             b = pkt.size;
1225     //             key_pos = pos;
1226     //         }
1227     //
1228     //         av_free_packet(&pkt);
1229     //     }
1230
1231         /* do the seek */
1232         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1233         url_fseek(s->pb, pos, SEEK_SET);
1234     }
1235     asf_reset_header(s);
1236     return 0;
1237 }
1238
1239 AVInputFormat ff_asf_demuxer = {
1240     "asf",
1241     NULL_IF_CONFIG_SMALL("ASF format"),
1242     sizeof(ASFContext),
1243     asf_probe,
1244     asf_read_header,
1245     asf_read_packet,
1246     asf_read_close,
1247     asf_read_seek,
1248     asf_read_pts,
1249 };