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 #undef NDEBUG
  36 #include <assert.h>
  37
  38 #define ASF_MAX_STREAMS 127
  39 #define FRAME_HEADER_SIZE 17
  40 // Fix Me! FRAME_HEADER_SIZE may be different.
  41
  42 static const ff_asf_guid index_guid = {
  43     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  44 };
  45
  46 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
  47     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
  48 };
  49 /**********************************/
  50 /* decoding */
  51
  52 int ff_guidcmp(const void *g1, const void *g2)
  53 {
  54     return memcmp(g1, g2, sizeof(ff_asf_guid));
  55 }
  56
  57 #ifdef DEBUG
  58 #define PRINT_IF_GUID(g,cmp) \
  59 if (!ff_guidcmp(g, &cmp)) \
  60     dprintf(NULL, "(GUID: %s) ", #cmp)
  61
  62 static void print_guid(const ff_asf_guid *g)
  63 {
  64     int i;
  65     PRINT_IF_GUID(g, ff_asf_header);
  66     else PRINT_IF_GUID(g, ff_asf_file_header);
  67     else PRINT_IF_GUID(g, ff_asf_stream_header);
  68     else PRINT_IF_GUID(g, ff_asf_audio_stream);
  69     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
  70     else PRINT_IF_GUID(g, ff_asf_video_stream);
  71     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
  72     else PRINT_IF_GUID(g, ff_asf_command_stream);
  73     else PRINT_IF_GUID(g, ff_asf_comment_header);
  74     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
  75     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
  76     else PRINT_IF_GUID(g, ff_asf_data_header);
  77     else PRINT_IF_GUID(g, index_guid);
  78     else PRINT_IF_GUID(g, ff_asf_head1_guid);
  79     else PRINT_IF_GUID(g, ff_asf_head2_guid);
  80     else PRINT_IF_GUID(g, ff_asf_my_guid);
  81     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
  82     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
  83     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
  84     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
  85     else PRINT_IF_GUID(g, ff_asf_metadata_header);
  86     else PRINT_IF_GUID(g, ff_asf_marker_header);
  87     else PRINT_IF_GUID(g, stream_bitrate_guid);
  88     else PRINT_IF_GUID(g, ff_asf_language_guid);
  89     else
  90         dprintf(NULL, "(GUID: unknown) ");
  91     for(i=0;i<16;i++)
  92         dprintf(NULL, " 0x%02x,", (*g)[i]);
  93     dprintf(NULL, "}\n");
  94 }
  95 #undef PRINT_IF_GUID
  96 #else
  97 #define print_guid(g)
  98 #endif
  99
 100 void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
 101 {
 102     assert(sizeof(*g) == 16);
 103     get_buffer(s, *g, sizeof(*g));
 104 }
 105
 106 #if 0
 107 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
 108 {
 109     int len, c;
 110     char *q;
 111
 112     len = get_le16(pb);
 113     q = buf;
 114     while (len > 0) {
 115         c = get_le16(pb);
 116         if ((q - buf) < buf_size - 1)
 117             *q++ = c;
 118         len--;
 119     }
 120     *q = '\0';
 121 }
 122 #endif
 123
 124 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 125 {
 126     char* q = buf;
 127     while (len > 1) {
 128         uint8_t tmp;
 129         uint32_t ch;
 130
 131         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
 132         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 133     }
 134     if (len > 0)
 135         url_fskip(pb, len);
 136     *q = '\0';
 137 }
 138
 139 static int asf_probe(AVProbeData *pd)
 140 {
 141     /* check file header */
 142     if (!ff_guidcmp(pd->buf, &ff_asf_header))
 143         return AVPROBE_SCORE_MAX;
 144     else
 145         return 0;
 146 }
 147
 148 static int get_value(ByteIOContext *pb, int type){
 149     switch(type){
 150         case 2: return get_le32(pb);
 151         case 3: return get_le32(pb);
 152         case 4: return get_le64(pb);
 153         case 5: return get_le16(pb);
 154         default:return INT_MIN;
 155     }
 156 }
 157
 158 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
 159 {
 160     char *value;
 161
 162     if ((unsigned)len >= (UINT_MAX - 1)/2)
 163         return;
 164
 165     value = av_malloc(2*len+1);
 166     if (!value)
 167         return;
 168
 169     if (type == 0) {         // UTF16-LE
 170         get_str16_nolen(s->pb, len, value, 2*len + 1);
 171     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
 172         uint64_t num = get_value(s->pb, type);
 173         snprintf(value, len, "%"PRIu64, num);
 174     } else {
 175         url_fskip(s->pb, len);
 176         av_freep(&value);
 177         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
 178         return;
 179     }
 180     av_metadata_set2(&s->metadata, key, value, 0);
 181     av_freep(&value);
 182 }
 183
 184 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 185 {
 186     ASFContext *asf = s->priv_data;
 187     ff_asf_guid g;
 188     ByteIOContext *pb = s->pb;
 189     AVStream *st;
 190     ASFStream *asf_st;
 191     int size, i;
 192     int64_t gsize;
 193     AVRational dar[128];
 194     uint32_t bitrate[128];
 195
 196     memset(dar, 0, sizeof(dar));
 197     memset(bitrate, 0, sizeof(bitrate));
 198
 199     ff_get_guid(pb, &g);
 200     if (ff_guidcmp(&g, &ff_asf_header))
 201         return -1;
 202     get_le64(pb);
 203     get_le32(pb);
 204     get_byte(pb);
 205     get_byte(pb);
 206     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 207     for(;;) {
 208         uint64_t gpos= url_ftell(pb);
 209         ff_get_guid(pb, &g);
 210         gsize = get_le64(pb);
 211         dprintf(s, "%08"PRIx64": ", gpos);
 212         print_guid(&g);
 213         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
 214         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
 215             asf->data_object_offset = url_ftell(pb);
 216             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 217             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
 218                 asf->data_object_size = gsize - 24;
 219             } else {
 220                 asf->data_object_size = (uint64_t)-1;
 221             }
 222             break;
 223         }
 224         if (gsize < 24)
 225             return -1;
 226         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
 227             ff_get_guid(pb, &asf->hdr.guid);
 228             asf->hdr.file_size          = get_le64(pb);
 229             asf->hdr.create_time        = get_le64(pb);
 230             asf->nb_packets             = get_le64(pb);
 231             asf->hdr.play_time          = get_le64(pb);
 232             asf->hdr.send_time          = get_le64(pb);
 233             asf->hdr.preroll            = get_le32(pb);
 234             asf->hdr.ignore             = get_le32(pb);
 235             asf->hdr.flags              = get_le32(pb);
 236             asf->hdr.min_pktsize        = get_le32(pb);
 237             asf->hdr.max_pktsize        = get_le32(pb);
 238             asf->hdr.max_bitrate        = get_le32(pb);
 239             s->packet_size = asf->hdr.max_pktsize;
 240         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
 241             enum AVMediaType type;
 242             int type_specific_size, sizeX;
 243             uint64_t total_size;
 244             unsigned int tag1;
 245             int64_t pos1, pos2, start_time;
 246             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
 247
 248             if (s->nb_streams == ASF_MAX_STREAMS) {
 249                 av_log(s, AV_LOG_ERROR, "too many streams\n");
 250                 return AVERROR(EINVAL);
 251             }
 252
 253             pos1 = url_ftell(pb);
 254
 255             st = av_new_stream(s, 0);
 256             if (!st)
 257                 return AVERROR(ENOMEM);
 258             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 259             asf_st = av_mallocz(sizeof(ASFStream));
 260             if (!asf_st)
 261                 return AVERROR(ENOMEM);
 262             st->priv_data = asf_st;
 263             start_time = asf->hdr.preroll;
 264
 265             asf_st->stream_language_index = 128; // invalid stream index means no language info
 266
 267             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 268                 st->duration = asf->hdr.play_time /
 269                     (10000000 / 1000) - start_time;
 270             }
 271             ff_get_guid(pb, &g);
 272
 273             test_for_ext_stream_audio = 0;
 274             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
 275                 type = AVMEDIA_TYPE_AUDIO;
 276             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
 277                 type = AVMEDIA_TYPE_VIDEO;
 278             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
 279                 type = AVMEDIA_TYPE_VIDEO;
 280                 st->codec->codec_id = CODEC_ID_MJPEG;
 281             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
 282                 type = AVMEDIA_TYPE_DATA;
 283             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
 284                 test_for_ext_stream_audio = 1;
 285                 type = AVMEDIA_TYPE_UNKNOWN;
 286             } else {
 287                 return -1;
 288             }
 289             ff_get_guid(pb, &g);
 290             total_size = get_le64(pb);
 291             type_specific_size = get_le32(pb);
 292             get_le32(pb);
 293             st->id = get_le16(pb) & 0x7f; /* stream id */
 294             // mapping of asf ID to AV stream ID;
 295             asf->asfid2avid[st->id] = s->nb_streams - 1;
 296
 297             get_le32(pb);
 298
 299             if (test_for_ext_stream_audio) {
 300                 ff_get_guid(pb, &g);
 301                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
 302                     type = AVMEDIA_TYPE_AUDIO;
 303                     is_dvr_ms_audio=1;
 304                     ff_get_guid(pb, &g);
 305                     get_le32(pb);
 306                     get_le32(pb);
 307                     get_le32(pb);
 308                     ff_get_guid(pb, &g);
 309                     get_le32(pb);
 310                 }
 311             }
 312
 313             st->codec->codec_type = type;
 314             if (type == AVMEDIA_TYPE_AUDIO) {
 315                 ff_get_wav_header(pb, st->codec, type_specific_size);
 316                 if (is_dvr_ms_audio) {
 317                     // codec_id and codec_tag are unreliable in dvr_ms
 318                     // files. Set them later by probing stream.
 319                     st->codec->codec_id = CODEC_ID_PROBE;
 320                     st->codec->codec_tag = 0;
 321                 }
 322                 if (st->codec->codec_id == CODEC_ID_AAC) {
 323                     st->need_parsing = AVSTREAM_PARSE_NONE;
 324                 } else {
 325                     st->need_parsing = AVSTREAM_PARSE_FULL;
 326                 }
 327                 /* We have to init the frame size at some point .... */
 328                 pos2 = url_ftell(pb);
 329                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
 330                     asf_st->ds_span = get_byte(pb);
 331                     asf_st->ds_packet_size = get_le16(pb);
 332                     asf_st->ds_chunk_size = get_le16(pb);
 333                     get_le16(pb); //ds_data_size
 334                     get_byte(pb); //ds_silence_data
 335                 }
 336                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 337                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 338                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 339                 if (asf_st->ds_span > 1) {
 340                     if (!asf_st->ds_chunk_size
 341                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 342                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 343                         asf_st->ds_span = 0; // disable descrambling
 344                 }
 345                 switch (st->codec->codec_id) {
 346                 case CODEC_ID_MP3:
 347                     st->codec->frame_size = MPA_FRAME_SIZE;
 348                     break;
 349                 case CODEC_ID_PCM_S16LE:
 350                 case CODEC_ID_PCM_S16BE:
 351                 case CODEC_ID_PCM_U16LE:
 352                 case CODEC_ID_PCM_U16BE:
 353                 case CODEC_ID_PCM_S8:
 354                 case CODEC_ID_PCM_U8:
 355                 case CODEC_ID_PCM_ALAW:
 356                 case CODEC_ID_PCM_MULAW:
 357                     st->codec->frame_size = 1;
 358                     break;
 359                 default:
 360                     /* This is probably wrong, but it prevents a crash later */
 361                     st->codec->frame_size = 1;
 362                     break;
 363                 }
 364             } else if (type == AVMEDIA_TYPE_VIDEO &&
 365                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
 366                 get_le32(pb);
 367                 get_le32(pb);
 368                 get_byte(pb);
 369                 size = get_le16(pb); /* size */
 370                 sizeX= get_le32(pb); /* size */
 371                 st->codec->width = get_le32(pb);
 372                 st->codec->height = get_le32(pb);
 373                 /* not available for asf */
 374                 get_le16(pb); /* panes */
 375                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
 376                 tag1 = get_le32(pb);
 377                 url_fskip(pb, 20);
 378 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 379                 size= sizeX;
 380                 if (size > 40) {
 381                     st->codec->extradata_size = size - 40;
 382                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 383                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 384                 }
 385
 386                 /* Extract palette from extradata if bpp <= 8 */
 387                 /* This code assumes that extradata contains only palette */
 388                 /* This is true for all paletted codecs implemented in ffmpeg */
 389                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
 390                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 391 #if HAVE_BIGENDIAN
 392                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 393                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
 394 #else
 395                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
 396                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 397 #endif
 398                     st->codec->palctrl->palette_changed = 1;
 399                 }
 400
 401                 st->codec->codec_tag = tag1;
 402                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
 403                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
 404                     st->need_parsing = AVSTREAM_PARSE_FULL;
 405                     // 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
 406                     st->codec->width  =
 407                     st->codec->height = 0;
 408                     av_freep(&st->codec->extradata);
 409                     st->codec->extradata_size=0;
 410                 }
 411                 if(st->codec->codec_id == CODEC_ID_H264)
 412                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
 413             }
 414             pos2 = url_ftell(pb);
 415             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 416         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
 417             int len1, len2, len3, len4, len5;
 418
 419             len1 = get_le16(pb);
 420             len2 = get_le16(pb);
 421             len3 = get_le16(pb);
 422             len4 = get_le16(pb);
 423             len5 = get_le16(pb);
 424             get_tag(s, "title"    , 0, len1);
 425             get_tag(s, "author"   , 0, len2);
 426             get_tag(s, "copyright", 0, len3);
 427             get_tag(s, "comment"  , 0, len4);
 428             url_fskip(pb, len5);
 429         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
 430             int stream_count = get_le16(pb);
 431             int j;
 432
 433 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
 434 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
 435             for(j = 0; j < stream_count; j++) {
 436                 int flags, bitrate, stream_id;
 437
 438                 flags= get_le16(pb);
 439                 bitrate= get_le32(pb);
 440                 stream_id= (flags & 0x7f);
 441 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
 442                 asf->stream_bitrates[stream_id]= bitrate;
 443             }
 444         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
 445             int j;
 446             int stream_count = get_le16(pb);
 447             for(j = 0; j < stream_count; j++) {
 448                 char lang[6];
 449                 unsigned int lang_len = get_byte(pb);
 450                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
 451                 if (j < 128)
 452                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
 453             }
 454         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
 455             int desc_count, i;
 456
 457             desc_count = get_le16(pb);
 458             for(i=0;i<desc_count;i++) {
 459                     int name_len,value_type,value_len;
 460                     char name[1024];
 461
 462                     name_len = get_le16(pb);
 463                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
 464                         name_len += 1;
 465                     get_str16_nolen(pb, name_len, name, sizeof(name));
 466                     value_type = get_le16(pb);
 467                     value_len  = get_le16(pb);
 468                     if (!value_type && value_len%2)
 469                         value_len += 1;
 470                     /**
 471                      * My sample has that stream set to 0 maybe that mean the container.
 472                      * Asf stream count start at 1. I am using 0 to the container value since it's unused
 473                      */
 474                     if (!strcmp(name, "AspectRatioX")){
 475                         dar[0].num= get_value(s->pb, value_type);
 476                     } else if(!strcmp(name, "AspectRatioY")){
 477                         dar[0].den= get_value(s->pb, value_type);
 478                     } else
 479                         get_tag(s, name, value_type, value_len);
 480             }
 481         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
 482             int n, stream_num, name_len, value_len, value_type, value_num;
 483             n = get_le16(pb);
 484
 485             for(i=0;i<n;i++) {
 486                 char name[1024];
 487
 488                 get_le16(pb); //lang_list_index
 489                 stream_num= get_le16(pb);
 490                 name_len=   get_le16(pb);
 491                 value_type= get_le16(pb);
 492                 value_len=  get_le32(pb);
 493
 494                 get_str16_nolen(pb, name_len, name, sizeof(name));
 495 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
 496                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
 497                 url_fskip(pb, value_len - 2);
 498
 499                 if(stream_num<128){
 500                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
 501                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
 502                 }
 503             }
 504         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
 505             int ext_len, payload_ext_ct, stream_ct;
 506             uint32_t ext_d, leak_rate, stream_num;
 507             unsigned int stream_languageid_index;
 508
 509             get_le64(pb); // starttime
 510             get_le64(pb); // endtime
 511             leak_rate = get_le32(pb); // leak-datarate
 512             get_le32(pb); // bucket-datasize
 513             get_le32(pb); // init-bucket-fullness
 514             get_le32(pb); // alt-leak-datarate
 515             get_le32(pb); // alt-bucket-datasize
 516             get_le32(pb); // alt-init-bucket-fullness
 517             get_le32(pb); // max-object-size
 518             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
 519             stream_num = get_le16(pb); // stream-num
 520
 521             stream_languageid_index = get_le16(pb); // stream-language-id-index
 522             if (stream_num < 128)
 523                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
 524
 525             get_le64(pb); // avg frametime in 100ns units
 526             stream_ct = get_le16(pb); //stream-name-count
 527             payload_ext_ct = get_le16(pb); //payload-extension-system-count
 528
 529             if (stream_num < 128)
 530                 bitrate[stream_num] = leak_rate;
 531
 532             for (i=0; i<stream_ct; i++){
 533                 get_le16(pb);
 534                 ext_len = get_le16(pb);
 535                 url_fseek(pb, ext_len, SEEK_CUR);
 536             }
 537
 538             for (i=0; i<payload_ext_ct; i++){
 539                 ff_get_guid(pb, &g);
 540                 ext_d=get_le16(pb);
 541                 ext_len=get_le32(pb);
 542                 url_fseek(pb, ext_len, SEEK_CUR);
 543             }
 544
 545             // there could be a optional stream properties object to follow
 546             // if so the next iteration will pick it up
 547             continue;
 548         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
 549             int v1, v2;
 550             ff_get_guid(pb, &g);
 551             v1 = get_le32(pb);
 552             v2 = get_le16(pb);
 553             continue;
 554         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
 555             int i, count, name_len;
 556             char name[1024];
 557
 558             get_le64(pb);            // reserved 16 bytes
 559             get_le64(pb);            // ...
 560             count = get_le32(pb);    // markers count
 561             get_le16(pb);            // reserved 2 bytes
 562             name_len = get_le16(pb); // name length
 563             for(i=0;i<name_len;i++){
 564                 get_byte(pb); // skip the name
 565             }
 566
 567             for(i=0;i<count;i++){
 568                 int64_t pres_time;
 569                 int name_len;
 570
 571                 get_le64(pb);             // offset, 8 bytes
 572                 pres_time = get_le64(pb); // presentation time
 573                 get_le16(pb);             // entry length
 574                 get_le32(pb);             // send time
 575                 get_le32(pb);             // flags
 576                 name_len = get_le32(pb);  // name length
 577                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
 578                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
 579             }
 580 #if 0
 581         } else if (!ff_guidcmp(&g, &ff_asf_codec_comment_header)) {
 582             int len, v1, n, num;
 583             char str[256], *q;
 584             char tag[16];
 585
 586             ff_get_guid(pb, &g);
 587             print_guid(&g);
 588
 589             n = get_le32(pb);
 590             for(i=0;i<n;i++) {
 591                 num = get_le16(pb); /* stream number */
 592                 get_str16(pb, str, sizeof(str));
 593                 get_str16(pb, str, sizeof(str));
 594                 len = get_le16(pb);
 595                 q = tag;
 596                 while (len > 0) {
 597                     v1 = get_byte(pb);
 598                     if ((q - tag) < sizeof(tag) - 1)
 599                         *q++ = v1;
 600                     len--;
 601                 }
 602                 *q = '\0';
 603             }
 604 #endif
 605         } else if (url_feof(pb)) {
 606             return -1;
 607         } else {
 608             if (!s->keylen) {
 609                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
 610                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
 611                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
 612                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
 613                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
 614                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
 615                 }
 616             }
 617         }
 618         if(url_ftell(pb) != gpos + gsize)
 619             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
 620         url_fseek(pb, gpos + gsize, SEEK_SET);
 621     }
 622     ff_get_guid(pb, &g);
 623     get_le64(pb);
 624     get_byte(pb);
 625     get_byte(pb);
 626     if (url_feof(pb))
 627         return -1;
 628     asf->data_offset = url_ftell(pb);
 629     asf->packet_size_left = 0;
 630
 631
 632     for(i=0; i<128; i++){
 633         int stream_num= asf->asfid2avid[i];
 634         if(stream_num>=0){
 635             AVStream *st = s->streams[stream_num];
 636             if (!st->codec->bit_rate)
 637                 st->codec->bit_rate = bitrate[i];
 638             if (dar[i].num > 0 && dar[i].den > 0){
 639                 av_reduce(&st->sample_aspect_ratio.num,
 640                           &st->sample_aspect_ratio.den,
 641                           dar[i].num, dar[i].den, INT_MAX);
 642             } else if ((dar[0].num > 0) && (dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
 643                 av_reduce(&st->sample_aspect_ratio.num,
 644                           &st->sample_aspect_ratio.den,
 645                           dar[0].num, dar[0].den, INT_MAX);
 646
 647 //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);
 648
 649             // copy and convert language codes to the frontend
 650             if (asf->streams[i].stream_language_index < 128) {
 651                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
 652                 if (rfc1766 && strlen(rfc1766) > 1) {
 653                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
 654                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
 655                     if (iso6392)
 656                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
 657                 }
 658             }
 659         }
 660     }
 661
 662     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 663
 664     return 0;
 665 }
 666
 667 #define DO_2BITS(bits, var, defval) \
 668     switch (bits & 3) \
 669     { \
 670     case 3: var = get_le32(pb); rsize += 4; break; \
 671     case 2: var = get_le16(pb); rsize += 2; break; \
 672     case 1: var = get_byte(pb); rsize++; break; \
 673     default: var = defval; break; \
 674     }
 675
 676 /**
 677  * Load a single ASF packet into the demuxer.
 678  * @param s demux context
 679  * @param pb context to read data from
 680  * @return 0 on success, <0 on error
 681  */
 682 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
 683 {
 684     ASFContext *asf = s->priv_data;
 685     uint32_t packet_length, padsize;
 686     int rsize = 8;
 687     int c, d, e, off;
 688
 689     // if we do not know packet size, allow skipping up to 32 kB
 690     off= 32768;
 691     if (s->packet_size > 0)
 692         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
 693
 694     c=d=e=-1;
 695     while(off-- > 0){
 696         c=d; d=e;
 697         e= get_byte(pb);
 698         if(c == 0x82 && !d && !e)
 699             break;
 700     }
 701
 702     if (c != 0x82) {
 703         /**
 704          * This code allows handling of -EAGAIN at packet boundaries (i.e.
 705          * if the packet sync code above triggers -EAGAIN). This does not
 706          * imply complete -EAGAIN handling support at random positions in
 707          * the stream.
 708          */
 709         if (url_ferror(pb) == AVERROR(EAGAIN))
 710             return AVERROR(EAGAIN);
 711         if (!url_feof(pb))
 712             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 713     }
 714     if ((c & 0x8f) == 0x82) {
 715         if (d || e) {
 716             if (!url_feof(pb))
 717                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 718             return -1;
 719         }
 720         c= get_byte(pb);
 721         d= get_byte(pb);
 722         rsize+=3;
 723     }else{
 724         url_fseek(pb, -1, SEEK_CUR); //FIXME
 725     }
 726
 727     asf->packet_flags    = c;
 728     asf->packet_property = d;
 729
 730     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
 731     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 732     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 733
 734     //the following checks prevent overflows and infinite loops
 735     if(!packet_length || packet_length >= (1U<<29)){
 736         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 737         return -1;
 738     }
 739     if(padsize >= packet_length){
 740         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 741         return -1;
 742     }
 743
 744     asf->packet_timestamp = get_le32(pb);
 745     get_le16(pb); /* duration */
 746     // rsize has at least 11 bytes which have to be present
 747
 748     if (asf->packet_flags & 0x01) {
 749         asf->packet_segsizetype = get_byte(pb); rsize++;
 750         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 751     } else {
 752         asf->packet_segments = 1;
 753         asf->packet_segsizetype = 0x80;
 754     }
 755     asf->packet_size_left = packet_length - padsize - rsize;
 756     if (packet_length < asf->hdr.min_pktsize)
 757         padsize += asf->hdr.min_pktsize - packet_length;
 758     asf->packet_padsize = padsize;
 759     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
 760     return 0;
 761 }
 762
 763 /**
 764  *
 765  * @return <0 if error
 766  */
 767 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
 768     ASFContext *asf = s->priv_data;
 769     int rsize = 1;
 770     int num = get_byte(pb);
 771     int64_t ts0, ts1;
 772
 773     asf->packet_segments--;
 774     asf->packet_key_frame = num >> 7;
 775     asf->stream_index = asf->asfid2avid[num & 0x7f];
 776     // sequence should be ignored!
 777     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 778     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 779     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 780 //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);
 781     if (asf->packet_replic_size >= 8) {
 782         asf->packet_obj_size = get_le32(pb);
 783         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 784             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 785             return -1;
 786         }
 787         asf->packet_frag_timestamp = get_le32(pb); // timestamp
 788         if(asf->packet_replic_size >= 8+38+4){
 789 //            for(i=0; i<asf->packet_replic_size-8; i++)
 790 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
 791 //            av_log(s, AV_LOG_DEBUG, "\n");
 792             url_fskip(pb, 10);
 793             ts0= get_le64(pb);
 794             ts1= get_le64(pb);
 795             url_fskip(pb, 12);
 796             get_le32(pb);
 797             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
 798             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
 799             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
 800         }else
 801             url_fskip(pb, asf->packet_replic_size - 8);
 802         rsize += asf->packet_replic_size; // FIXME - check validity
 803     } else if (asf->packet_replic_size==1){
 804         // multipacket - frag_offset is beginning timestamp
 805         asf->packet_time_start = asf->packet_frag_offset;
 806         asf->packet_frag_offset = 0;
 807         asf->packet_frag_timestamp = asf->packet_timestamp;
 808
 809         asf->packet_time_delta = get_byte(pb);
 810         rsize++;
 811     }else if(asf->packet_replic_size!=0){
 812         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 813         return -1;
 814     }
 815     if (asf->packet_flags & 0x01) {
 816         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 817         if(asf->packet_frag_size > asf->packet_size_left - rsize){
 818             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
 819             return -1;
 820         }
 821         //printf("Fragsize %d\n", asf->packet_frag_size);
 822     } else {
 823         asf->packet_frag_size = asf->packet_size_left - rsize;
 824         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 825     }
 826     if (asf->packet_replic_size == 1) {
 827         asf->packet_multi_size = asf->packet_frag_size;
 828         if (asf->packet_multi_size > asf->packet_size_left)
 829             return -1;
 830     }
 831     asf->packet_size_left -= rsize;
 832     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 833
 834     return 0;
 835 }
 836
 837 /**
 838  * Parse data from individual ASF packets (which were previously loaded
 839  * with asf_get_packet()).
 840  * @param s demux context
 841  * @param pb context to read data from
 842  * @param pkt pointer to store packet data into
 843  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
 844  *          packets need to be loaded (through asf_get_packet())
 845  */
 846 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
 847 {
 848     ASFContext *asf = s->priv_data;
 849     ASFStream *asf_st = 0;
 850     for (;;) {
 851         int ret;
 852         if(url_feof(pb))
 853             return AVERROR_EOF;
 854         if (asf->packet_size_left < FRAME_HEADER_SIZE
 855             || asf->packet_segments < 1) {
 856             //asf->packet_size_left <= asf->packet_padsize) {
 857             int ret = asf->packet_size_left + asf->packet_padsize;
 858             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 859             assert(ret>=0);
 860             /* fail safe */
 861             url_fskip(pb, ret);
 862
 863             asf->packet_pos= url_ftell(pb);
 864             if (asf->data_object_size != (uint64_t)-1 &&
 865                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 866                 return AVERROR_EOF; /* Do not exceed the size of the data object */
 867             return 1;
 868         }
 869         if (asf->packet_time_start == 0) {
 870             if(asf_read_frame_header(s, pb) < 0){
 871                 asf->packet_segments= 0;
 872                 continue;
 873             }
 874             if (asf->stream_index < 0
 875                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 876                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 877                 ) {
 878                 asf->packet_time_start = 0;
 879                 /* unhandled packet (should not happen) */
 880                 url_fskip(pb, asf->packet_frag_size);
 881                 asf->packet_size_left -= asf->packet_frag_size;
 882                 if(asf->stream_index < 0)
 883                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
 884                 continue;
 885             }
 886             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 887         }
 888         asf_st = asf->asf_st;
 889
 890         if (asf->packet_replic_size == 1) {
 891             // frag_offset is here used as the beginning timestamp
 892             asf->packet_frag_timestamp = asf->packet_time_start;
 893             asf->packet_time_start += asf->packet_time_delta;
 894             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 895             asf->packet_size_left--;
 896             asf->packet_multi_size--;
 897             if (asf->packet_multi_size < asf->packet_obj_size)
 898             {
 899                 asf->packet_time_start = 0;
 900                 url_fskip(pb, asf->packet_multi_size);
 901                 asf->packet_size_left -= asf->packet_multi_size;
 902                 continue;
 903             }
 904             asf->packet_multi_size -= asf->packet_obj_size;
 905             //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);
 906         }
 907         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
 908               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
 909            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
 910             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
 911                 asf_st->frag_offset, asf->packet_frag_size,
 912                 asf->packet_obj_size, asf_st->pkt.size);
 913             asf->packet_obj_size= asf_st->pkt.size;
 914         }
 915
 916         if (   asf_st->pkt.size != asf->packet_obj_size
 917             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
 918             if(asf_st->pkt.data){
 919                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
 920                 asf_st->frag_offset = 0;
 921                 av_free_packet(&asf_st->pkt);
 922             }
 923             /* new packet */
 924             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 925             asf_st->seq = asf->packet_seq;
 926             asf_st->pkt.dts = asf->packet_frag_timestamp;
 927             asf_st->pkt.stream_index = asf->stream_index;
 928             asf_st->pkt.pos =
 929             asf_st->packet_pos= asf->packet_pos;
 930 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 931 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
 932 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
 933             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 934                 asf->packet_key_frame = 1;
 935             if (asf->packet_key_frame)
 936                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
 937         }
 938
 939         /* read data */
 940         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 941         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 942         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 943         asf->packet_size_left -= asf->packet_frag_size;
 944         if (asf->packet_size_left < 0)
 945             continue;
 946
 947         if(   asf->packet_frag_offset >= asf_st->pkt.size
 948            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
 949             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
 950                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
 951             continue;
 952         }
 953
 954         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 955                          asf->packet_frag_size);
 956         if (ret != asf->packet_frag_size) {
 957             if (ret < 0 || asf->packet_frag_offset + ret == 0)
 958                 return ret < 0 ? ret : AVERROR_EOF;
 959             if (asf_st->ds_span > 1) {
 960                 // scrambling, we can either drop it completely or fill the remainder
 961                 // TODO: should we fill the whole packet instead of just the current
 962                 // fragment?
 963                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
 964                        asf->packet_frag_size - ret);
 965                 ret = asf->packet_frag_size;
 966             } else
 967                 // no scrambling, so we can return partial packets
 968                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
 969         }
 970         if (s->key && s->keylen == 20)
 971             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
 972                             ret);
 973         asf_st->frag_offset += ret;
 974         /* test if whole packet is read */
 975         if (asf_st->frag_offset == asf_st->pkt.size) {
 976             //workaround for macroshit radio DVR-MS files
 977             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
 978                && asf_st->pkt.size > 100){
 979                 int i;
 980                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
 981                 if(i == asf_st->pkt.size){
 982                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
 983                     asf_st->frag_offset = 0;
 984                     av_free_packet(&asf_st->pkt);
 985                     continue;
 986                 }
 987             }
 988
 989             /* return packet */
 990             if (asf_st->ds_span > 1) {
 991               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 992                     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);
 993               }else{
 994                 /* packet descrambling */
 995                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
 996                 if (newdata) {
 997                     int offset = 0;
 998                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 999                     while (offset < asf_st->pkt.size) {
1000                         int off = offset / asf_st->ds_chunk_size;
1001                         int row = off / asf_st->ds_span;
1002                         int col = off % asf_st->ds_span;
1003                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1004                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
1005
1006                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1007                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1008                         memcpy(newdata + offset,
1009                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1010                                asf_st->ds_chunk_size);
1011                         offset += asf_st->ds_chunk_size;
1012                     }
1013                     av_free(asf_st->pkt.data);
1014                     asf_st->pkt.data = newdata;
1015                 }
1016               }
1017             }
1018             asf_st->frag_offset = 0;
1019             *pkt= asf_st->pkt;
1020             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
1021             asf_st->pkt.size = 0;
1022             asf_st->pkt.data = 0;
1023             break; // packet completed
1024         }
1025     }
1026     return 0;
1027 }
1028
1029 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1030 {
1031     ASFContext *asf = s->priv_data;
1032
1033     for (;;) {
1034         int ret;
1035
1036         /* parse cached packets, if any */
1037         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1038             return ret;
1039         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1040             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1041         asf->packet_time_start = 0;
1042     }
1043
1044     return 0;
1045 }
1046
1047 // Added to support seeking after packets have been read
1048 // If information is not reset, read_packet fails due to
1049 // leftover information from previous reads
1050 static void asf_reset_header(AVFormatContext *s)
1051 {
1052     ASFContext *asf = s->priv_data;
1053     ASFStream *asf_st;
1054     int i;
1055
1056     asf->packet_nb_frames = 0;
1057     asf->packet_size_left = 0;
1058     asf->packet_segments = 0;
1059     asf->packet_flags = 0;
1060     asf->packet_property = 0;
1061     asf->packet_timestamp = 0;
1062     asf->packet_segsizetype = 0;
1063     asf->packet_segments = 0;
1064     asf->packet_seq = 0;
1065     asf->packet_replic_size = 0;
1066     asf->packet_key_frame = 0;
1067     asf->packet_padsize = 0;
1068     asf->packet_frag_offset = 0;
1069     asf->packet_frag_size = 0;
1070     asf->packet_frag_timestamp = 0;
1071     asf->packet_multi_size = 0;
1072     asf->packet_obj_size = 0;
1073     asf->packet_time_delta = 0;
1074     asf->packet_time_start = 0;
1075
1076     for(i=0; i<s->nb_streams; i++){
1077         asf_st= s->streams[i]->priv_data;
1078         av_free_packet(&asf_st->pkt);
1079         asf_st->frag_offset=0;
1080         asf_st->seq=0;
1081     }
1082     asf->asf_st= NULL;
1083 }
1084
1085 static int asf_read_close(AVFormatContext *s)
1086 {
1087     int i;
1088
1089     asf_reset_header(s);
1090     for(i=0;i<s->nb_streams;i++) {
1091         AVStream *st = s->streams[i];
1092         av_free(st->codec->palctrl);
1093     }
1094     return 0;
1095 }
1096
1097 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1098 {
1099     AVPacket pkt1, *pkt = &pkt1;
1100     ASFStream *asf_st;
1101     int64_t pts;
1102     int64_t pos= *ppos;
1103     int i;
1104     int64_t start_pos[ASF_MAX_STREAMS];
1105
1106     for(i=0; i<s->nb_streams; i++){
1107         start_pos[i]= pos;
1108     }
1109
1110     if (s->packet_size > 0)
1111         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1112     *ppos= pos;
1113     url_fseek(s->pb, pos, SEEK_SET);
1114
1115 //printf("asf_read_pts\n");
1116     asf_reset_header(s);
1117     for(;;){
1118         if (av_read_frame(s, pkt) < 0){
1119             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1120             return AV_NOPTS_VALUE;
1121         }
1122
1123         pts= pkt->pts;
1124
1125         av_free_packet(pkt);
1126         if(pkt->flags&AV_PKT_FLAG_KEY){
1127             i= pkt->stream_index;
1128
1129             asf_st= s->streams[i]->priv_data;
1130
1131 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1132             pos= asf_st->packet_pos;
1133
1134             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1135             start_pos[i]= asf_st->packet_pos + 1;
1136
1137             if(pkt->stream_index == stream_index)
1138                break;
1139         }
1140     }
1141
1142     *ppos= pos;
1143 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1144
1145     return pts;
1146 }
1147
1148 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1149 {
1150     ff_asf_guid g;
1151     ASFContext *asf = s->priv_data;
1152     int64_t current_pos= url_ftell(s->pb);
1153     int i;
1154
1155     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1156     ff_get_guid(s->pb, &g);
1157
1158     /* the data object can be followed by other top-level objects,
1159        skip them until the simple index object is reached */
1160     while (ff_guidcmp(&g, &index_guid)) {
1161         int64_t gsize= get_le64(s->pb);
1162         if (gsize < 24 || url_feof(s->pb)) {
1163             url_fseek(s->pb, current_pos, SEEK_SET);
1164             return;
1165         }
1166         url_fseek(s->pb, gsize-24, SEEK_CUR);
1167         ff_get_guid(s->pb, &g);
1168     }
1169
1170     {
1171         int64_t itime, last_pos=-1;
1172         int pct, ict;
1173         int64_t av_unused gsize= get_le64(s->pb);
1174         ff_get_guid(s->pb, &g);
1175         itime=get_le64(s->pb);
1176         pct=get_le32(s->pb);
1177         ict=get_le32(s->pb);
1178         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1179
1180         for (i=0;i<ict;i++){
1181             int pktnum=get_le32(s->pb);
1182             int pktct =get_le16(s->pb);
1183             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1184             int64_t index_pts= av_rescale(itime, i, 10000);
1185
1186             if(pos != last_pos){
1187             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1188             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1189             last_pos=pos;
1190             }
1191         }
1192         asf->index_read= 1;
1193     }
1194     url_fseek(s->pb, current_pos, SEEK_SET);
1195 }
1196
1197 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1198 {
1199     ASFContext *asf = s->priv_data;
1200     AVStream *st = s->streams[stream_index];
1201     int64_t pos;
1202     int index;
1203
1204     if (s->packet_size <= 0)
1205         return -1;
1206
1207     /* Try using the protocol's read_seek if available */
1208     if(s->pb) {
1209         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1210         if(ret >= 0)
1211             asf_reset_header(s);
1212         if (ret != AVERROR(ENOSYS))
1213             return ret;
1214     }
1215
1216     if (!asf->index_read)
1217         asf_build_simple_index(s, stream_index);
1218
1219     if(!(asf->index_read && st->index_entries)){
1220         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1221             return -1;
1222     }else{
1223         index= av_index_search_timestamp(st, pts, flags);
1224         if(index<0)
1225             return -1;
1226
1227         /* find the position */
1228         pos = st->index_entries[index].pos;
1229
1230     // various attempts to find key frame have failed so far
1231     //    asf_reset_header(s);
1232     //    url_fseek(s->pb, pos, SEEK_SET);
1233     //    key_pos = pos;
1234     //     for(i=0;i<16;i++){
1235     //         pos = url_ftell(s->pb);
1236     //         if (av_read_frame(s, &pkt) < 0){
1237     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1238     //             return -1;
1239     //         }
1240     //         asf_st = s->streams[stream_index]->priv_data;
1241     //         pos += st->parser->frame_offset;
1242     //
1243     //         if (pkt.size > b) {
1244     //             b = pkt.size;
1245     //             key_pos = pos;
1246     //         }
1247     //
1248     //         av_free_packet(&pkt);
1249     //     }
1250
1251         /* do the seek */
1252         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1253         url_fseek(s->pb, pos, SEEK_SET);
1254     }
1255     asf_reset_header(s);
1256     return 0;
1257 }
1258
1259 AVInputFormat asf_demuxer = {
1260     "asf",
1261     NULL_IF_CONFIG_SMALL("ASF format"),
1262     sizeof(ASFContext),
1263     asf_probe,
1264     asf_read_header,
1265     asf_read_packet,
1266     asf_read_close,
1267     asf_read_seek,
1268     asf_read_pts,
1269 };