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ffmpeg / libavformat / asf.c @ 11c55efa

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1
/*
2
 * ASF compatible demuxer
3
 * Copyright (c) 2000, 2001 Fabrice Bellard.
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
#include "avformat.h"
22
#include "riff.h"
23
#include "mpegaudio.h"
24
#include "asf.h"
25
#include "common.h"
26
#include "asfcrypt.h"
27

    
28
extern void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
29

    
30
#undef NDEBUG
31
#include <assert.h>
32

    
33
#define FRAME_HEADER_SIZE 17
34
// Fix Me! FRAME_HEADER_SIZE may be different.
35

    
36
static const GUID index_guid = {
37
    0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
38
};
39

    
40
static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
41
    0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
42
};
43
/**********************************/
44
/* decoding */
45

    
46
//#define DEBUG
47

    
48
#ifdef DEBUG
49
#define PRINT_IF_GUID(g,cmp) \
50
if (!memcmp(g, &cmp, sizeof(GUID))) \
51
    printf("(GUID: %s) ", #cmp)
52

    
53
static void print_guid(const GUID *g)
54
{
55
    int i;
56
    PRINT_IF_GUID(g, asf_header);
57
    else PRINT_IF_GUID(g, file_header);
58
    else PRINT_IF_GUID(g, stream_header);
59
    else PRINT_IF_GUID(g, audio_stream);
60
    else PRINT_IF_GUID(g, audio_conceal_none);
61
    else PRINT_IF_GUID(g, video_stream);
62
    else PRINT_IF_GUID(g, video_conceal_none);
63
    else PRINT_IF_GUID(g, command_stream);
64
    else PRINT_IF_GUID(g, comment_header);
65
    else PRINT_IF_GUID(g, codec_comment_header);
66
    else PRINT_IF_GUID(g, codec_comment1_header);
67
    else PRINT_IF_GUID(g, data_header);
68
    else PRINT_IF_GUID(g, index_guid);
69
    else PRINT_IF_GUID(g, head1_guid);
70
    else PRINT_IF_GUID(g, head2_guid);
71
    else PRINT_IF_GUID(g, my_guid);
72
    else PRINT_IF_GUID(g, ext_stream_header);
73
    else PRINT_IF_GUID(g, extended_content_header);
74
    else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
75
    else PRINT_IF_GUID(g, ext_stream_audio_stream);
76
    else PRINT_IF_GUID(g, metadata_header);
77
    else PRINT_IF_GUID(g, stream_bitrate_guid);
78
    else
79
        printf("(GUID: unknown) ");
80
    for(i=0;i<16;i++)
81
        printf(" 0x%02x,", (*g)[i]);
82
    printf("}\n");
83
}
84
#undef PRINT_IF_GUID
85
#endif
86

    
87
static void get_guid(ByteIOContext *s, GUID *g)
88
{
89
    assert(sizeof(*g) == 16);
90
    get_buffer(s, *g, sizeof(*g));
91
}
92

    
93
#if 0
94
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
95
{
96
    int len, c;
97
    char *q;
98

99
    len = get_le16(pb);
100
    q = buf;
101
    while (len > 0) {
102
        c = get_le16(pb);
103
        if ((q - buf) < buf_size - 1)
104
            *q++ = c;
105
        len--;
106
    }
107
    *q = '\0';
108
}
109
#endif
110

    
111
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
112
{
113
    char* q = buf;
114
    len /= 2;
115
    while (len--) {
116
        uint8_t tmp;
117
        PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
118
    }
119
    *q = '\0';
120
}
121

    
122
static int asf_probe(AVProbeData *pd)
123
{
124
    /* check file header */
125
    if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
126
        return AVPROBE_SCORE_MAX;
127
    else
128
        return 0;
129
}
130

    
131
static int get_value(ByteIOContext *pb, int type){
132
    switch(type){
133
        case 2: return get_le32(pb);
134
        case 3: return get_le32(pb);
135
        case 4: return get_le64(pb);
136
        case 5: return get_le16(pb);
137
        default:return INT_MIN;
138
    }
139
}
140

    
141
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
142
{
143
    ASFContext *asf = s->priv_data;
144
    GUID g;
145
    ByteIOContext *pb = s->pb;
146
    AVStream *st;
147
    ASFStream *asf_st;
148
    int size, i;
149
    int64_t gsize;
150
    AVRational dar[128];
151
    uint32_t bitrate[128];
152

    
153
    memset(dar, 0, sizeof(dar));
154
    memset(bitrate, 0, sizeof(bitrate));
155

    
156
    get_guid(pb, &g);
157
    if (memcmp(&g, &asf_header, sizeof(GUID)))
158
        goto fail;
159
    get_le64(pb);
160
    get_le32(pb);
161
    get_byte(pb);
162
    get_byte(pb);
163
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
164
    for(;;) {
165
        get_guid(pb, &g);
166
        gsize = get_le64(pb);
167
#ifdef DEBUG
168
        printf("%08"PRIx64": ", url_ftell(pb) - 24);
169
        print_guid(&g);
170
        printf("  size=0x%"PRIx64"\n", gsize);
171
#endif
172
        if (!memcmp(&g, &data_header, sizeof(GUID))) {
173
            asf->data_object_offset = url_ftell(pb);
174
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
175
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
176
                asf->data_object_size = gsize - 24;
177
            } else {
178
                asf->data_object_size = (uint64_t)-1;
179
            }
180
            break;
181
        }
182
        if (gsize < 24)
183
            goto fail;
184
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
185
            get_guid(pb, &asf->hdr.guid);
186
            asf->hdr.file_size          = get_le64(pb);
187
            asf->hdr.create_time        = get_le64(pb);
188
            asf->nb_packets             = get_le64(pb);
189
            asf->hdr.send_time          = get_le64(pb);
190
            asf->hdr.play_time          = get_le64(pb);
191
            asf->hdr.preroll            = get_le32(pb);
192
            asf->hdr.ignore             = get_le32(pb);
193
            asf->hdr.flags              = get_le32(pb);
194
            asf->hdr.min_pktsize        = get_le32(pb);
195
            asf->hdr.max_pktsize        = get_le32(pb);
196
            asf->hdr.max_bitrate        = get_le32(pb);
197
            asf->packet_size = asf->hdr.max_pktsize;
198
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
199
            int type, type_specific_size, sizeX;
200
            uint64_t total_size;
201
            unsigned int tag1;
202
            int64_t pos1, pos2, start_time;
203
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
204

    
205
            pos1 = url_ftell(pb);
206

    
207
            st = av_new_stream(s, 0);
208
            if (!st)
209
                goto fail;
210
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
211
            asf_st = av_mallocz(sizeof(ASFStream));
212
            if (!asf_st)
213
                goto fail;
214
            st->priv_data = asf_st;
215
            start_time = asf->hdr.preroll;
216

    
217
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
218
                st->duration = asf->hdr.send_time /
219
                    (10000000 / 1000) - start_time;
220
            }
221
            get_guid(pb, &g);
222

    
223
            test_for_ext_stream_audio = 0;
224
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
225
                type = CODEC_TYPE_AUDIO;
226
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
227
                type = CODEC_TYPE_VIDEO;
228
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
229
                type = CODEC_TYPE_UNKNOWN;
230
            } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
231
                test_for_ext_stream_audio = 1;
232
                type = CODEC_TYPE_UNKNOWN;
233
            } else {
234
                goto fail;
235
            }
236
            get_guid(pb, &g);
237
            total_size = get_le64(pb);
238
            type_specific_size = get_le32(pb);
239
            get_le32(pb);
240
            st->id = get_le16(pb) & 0x7f; /* stream id */
241
            // mapping of asf ID to AV stream ID;
242
            asf->asfid2avid[st->id] = s->nb_streams - 1;
243

    
244
            get_le32(pb);
245

    
246
            if (test_for_ext_stream_audio) {
247
                get_guid(pb, &g);
248
                if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
249
                    type = CODEC_TYPE_AUDIO;
250
                    is_dvr_ms_audio=1;
251
                    get_guid(pb, &g);
252
                    get_le32(pb);
253
                    get_le32(pb);
254
                    get_le32(pb);
255
                    get_guid(pb, &g);
256
                    get_le32(pb);
257
                }
258
            }
259

    
260
            st->codec->codec_type = type;
261
            if (type == CODEC_TYPE_AUDIO) {
262
                get_wav_header(pb, st->codec, type_specific_size);
263
                if (is_dvr_ms_audio) {
264
                    // codec_id and codec_tag are unreliable in dvr_ms
265
                    // files. Set them later by probing stream.
266
                    st->codec->codec_id = CODEC_ID_NONE;
267
                    st->codec->codec_tag = 0;
268
                }
269
                st->need_parsing = AVSTREAM_PARSE_FULL;
270
                /* We have to init the frame size at some point .... */
271
                pos2 = url_ftell(pb);
272
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
273
                    asf_st->ds_span = get_byte(pb);
274
                    asf_st->ds_packet_size = get_le16(pb);
275
                    asf_st->ds_chunk_size = get_le16(pb);
276
                    get_le16(pb); //ds_data_size
277
                    get_byte(pb); //ds_silence_data
278
                }
279
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
280
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
281
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
282
                if (asf_st->ds_span > 1) {
283
                    if (!asf_st->ds_chunk_size
284
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
285
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
286
                        asf_st->ds_span = 0; // disable descrambling
287
                }
288
                switch (st->codec->codec_id) {
289
                case CODEC_ID_MP3:
290
                    st->codec->frame_size = MPA_FRAME_SIZE;
291
                    break;
292
                case CODEC_ID_PCM_S16LE:
293
                case CODEC_ID_PCM_S16BE:
294
                case CODEC_ID_PCM_U16LE:
295
                case CODEC_ID_PCM_U16BE:
296
                case CODEC_ID_PCM_S8:
297
                case CODEC_ID_PCM_U8:
298
                case CODEC_ID_PCM_ALAW:
299
                case CODEC_ID_PCM_MULAW:
300
                    st->codec->frame_size = 1;
301
                    break;
302
                default:
303
                    /* This is probably wrong, but it prevents a crash later */
304
                    st->codec->frame_size = 1;
305
                    break;
306
                }
307
            } else if (type == CODEC_TYPE_VIDEO) {
308
                get_le32(pb);
309
                get_le32(pb);
310
                get_byte(pb);
311
                size = get_le16(pb); /* size */
312
                sizeX= get_le32(pb); /* size */
313
                st->codec->width = get_le32(pb);
314
                st->codec->height = get_le32(pb);
315
                /* not available for asf */
316
                get_le16(pb); /* panes */
317
                st->codec->bits_per_sample = get_le16(pb); /* depth */
318
                tag1 = get_le32(pb);
319
                url_fskip(pb, 20);
320
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
321
                size= sizeX;
322
                if (size > 40) {
323
                    st->codec->extradata_size = size - 40;
324
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
325
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
326
                }
327

    
328
        /* Extract palette from extradata if bpp <= 8 */
329
        /* This code assumes that extradata contains only palette */
330
        /* This is true for all paletted codecs implemented in ffmpeg */
331
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
332
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
333
#ifdef WORDS_BIGENDIAN
334
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
335
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
336
#else
337
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
338
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
339
#endif
340
            st->codec->palctrl->palette_changed = 1;
341
        }
342

    
343
                st->codec->codec_tag = tag1;
344
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
345
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
346
                    st->need_parsing = AVSTREAM_PARSE_FULL;
347
            }
348
            pos2 = url_ftell(pb);
349
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
350
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
351
            int len1, len2, len3, len4, len5;
352

    
353
            len1 = get_le16(pb);
354
            len2 = get_le16(pb);
355
            len3 = get_le16(pb);
356
            len4 = get_le16(pb);
357
            len5 = get_le16(pb);
358
            get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
359
            get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
360
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
361
            get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
362
            url_fskip(pb, len5);
363
        } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
364
            int stream_count = get_le16(pb);
365
            int j;
366

    
367
//            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
368
//            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
369
            for(j = 0; j < stream_count; j++) {
370
                int flags, bitrate, stream_id;
371

    
372
                flags= get_le16(pb);
373
                bitrate= get_le32(pb);
374
                stream_id= (flags & 0x7f);
375
//                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
376
                asf->stream_bitrates[stream_id]= bitrate;
377
            }
378
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
379
                int desc_count, i;
380

    
381
                desc_count = get_le16(pb);
382
                for(i=0;i<desc_count;i++)
383
                {
384
                        int name_len,value_type,value_len;
385
                        uint64_t value_num = 0;
386
                        char name[1024];
387

    
388
                        name_len = get_le16(pb);
389
                        get_str16_nolen(pb, name_len, name, sizeof(name));
390
                        value_type = get_le16(pb);
391
                        value_len = get_le16(pb);
392
                        if (value_type <= 1) // unicode or byte
393
                        {
394
                                if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
395
                                else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
396
                                else if(!strcmp(name,"WM/Year"      )) {
397
                                    char year[8];
398
                                    get_str16_nolen(pb, value_len, year, sizeof(year));
399
                                    s->year = atoi(year);
400
                                }
401
                                else if(!strcmp(name,"WM/Track") && s->track == 0) {
402
                                    char track[8];
403
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
404
                                    s->track = strtol(track, NULL, 10) + 1;
405
                                }
406
                                else if(!strcmp(name,"WM/TrackNumber")) {
407
                                    char track[8];
408
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
409
                                    s->track = strtol(track, NULL, 10);
410
                                }
411
                                else url_fskip(pb, value_len);
412
                        }
413
                        else if (value_type <= 5) // boolean or DWORD or QWORD or WORD
414
                        {
415
                                value_num= get_value(pb, value_type);
416
                                if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
417
                                if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
418
                        }else
419
                            url_fskip(pb, value_len);
420
                }
421
        } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
422
            int n, stream_num, name_len, value_len, value_type, value_num;
423
            n = get_le16(pb);
424

    
425
            for(i=0;i<n;i++) {
426
                char name[1024];
427

    
428
                get_le16(pb); //lang_list_index
429
                stream_num= get_le16(pb);
430
                name_len=   get_le16(pb);
431
                value_type= get_le16(pb);
432
                value_len=  get_le32(pb);
433

    
434
                get_str16_nolen(pb, name_len, name, sizeof(name));
435
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
436
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
437
                url_fskip(pb, value_len - 2);
438

    
439
                if(stream_num<128){
440
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
441
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
442
                }
443
            }
444
        } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
445
            int ext_len, payload_ext_ct, stream_ct;
446
            uint32_t ext_d, leak_rate, stream_num;
447
            int64_t pos_ex_st;
448
            pos_ex_st = url_ftell(pb);
449

    
450
            get_le64(pb); // starttime
451
            get_le64(pb); // endtime
452
            leak_rate = get_le32(pb); // leak-datarate
453
            get_le32(pb); // bucket-datasize
454
            get_le32(pb); // init-bucket-fullness
455
            get_le32(pb); // alt-leak-datarate
456
            get_le32(pb); // alt-bucket-datasize
457
            get_le32(pb); // alt-init-bucket-fullness
458
            get_le32(pb); // max-object-size
459
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
460
            stream_num = get_le16(pb); // stream-num
461
            get_le16(pb); // stream-language-id-index
462
            get_le64(pb); // avg frametime in 100ns units
463
            stream_ct = get_le16(pb); //stream-name-count
464
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
465

    
466
            if (stream_num < 128)
467
                bitrate[stream_num] = leak_rate;
468

    
469
            for (i=0; i<stream_ct; i++){
470
                get_le16(pb);
471
                ext_len = get_le16(pb);
472
                url_fseek(pb, ext_len, SEEK_CUR);
473
            }
474

    
475
            for (i=0; i<payload_ext_ct; i++){
476
                get_guid(pb, &g);
477
                ext_d=get_le16(pb);
478
                ext_len=get_le32(pb);
479
                url_fseek(pb, ext_len, SEEK_CUR);
480
            }
481

    
482
            // there could be a optional stream properties object to follow
483
            // if so the next iteration will pick it up
484
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
485
            int v1, v2;
486
            get_guid(pb, &g);
487
            v1 = get_le32(pb);
488
            v2 = get_le16(pb);
489
#if 0
490
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
491
            int len, v1, n, num;
492
            char str[256], *q;
493
            char tag[16];
494

495
            get_guid(pb, &g);
496
            print_guid(&g);
497

498
            n = get_le32(pb);
499
            for(i=0;i<n;i++) {
500
                num = get_le16(pb); /* stream number */
501
                get_str16(pb, str, sizeof(str));
502
                get_str16(pb, str, sizeof(str));
503
                len = get_le16(pb);
504
                q = tag;
505
                while (len > 0) {
506
                    v1 = get_byte(pb);
507
                    if ((q - tag) < sizeof(tag) - 1)
508
                        *q++ = v1;
509
                    len--;
510
                }
511
                *q = '\0';
512
            }
513
#endif
514
        } else if (url_feof(pb)) {
515
            goto fail;
516
        } else {
517
            url_fseek(pb, gsize - 24, SEEK_CUR);
518
        }
519
    }
520
    get_guid(pb, &g);
521
    get_le64(pb);
522
    get_byte(pb);
523
    get_byte(pb);
524
    if (url_feof(pb))
525
        goto fail;
526
    asf->data_offset = url_ftell(pb);
527
    asf->packet_size_left = 0;
528

    
529

    
530
    for(i=0; i<128; i++){
531
        int stream_num= asf->asfid2avid[i];
532
        if(stream_num>=0){
533
            AVCodecContext *codec= s->streams[stream_num]->codec;
534
            if (!codec->bit_rate)
535
                codec->bit_rate = bitrate[i];
536
            if (dar[i].num > 0 && dar[i].den > 0)
537
                av_reduce(&codec->sample_aspect_ratio.num,
538
                          &codec->sample_aspect_ratio.den,
539
                          dar[i].num, dar[i].den, INT_MAX);
540
//av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
541
        }
542
    }
543

    
544
    return 0;
545

    
546
 fail:
547
     for(i=0;i<s->nb_streams;i++) {
548
        AVStream *st = s->streams[i];
549
        if (st) {
550
            av_free(st->priv_data);
551
            av_free(st->codec->extradata);
552
        }
553
        av_free(st);
554
    }
555
    return -1;
556
}
557

    
558
#define DO_2BITS(bits, var, defval) \
559
    switch (bits & 3) \
560
    { \
561
    case 3: var = get_le32(pb); rsize += 4; break; \
562
    case 2: var = get_le16(pb); rsize += 2; break; \
563
    case 1: var = get_byte(pb); rsize++; break; \
564
    default: var = defval; break; \
565
    }
566

    
567
/**
568
 *
569
 * @return <0 in case of an error
570
 */
571
static int asf_get_packet(AVFormatContext *s)
572
{
573
    ASFContext *asf = s->priv_data;
574
    ByteIOContext *pb = s->pb;
575
    uint32_t packet_length, padsize;
576
    int rsize = 8;
577
    int c, d, e, off;
578

    
579
    off= (url_ftell(s->pb) - s->data_offset) % asf->packet_size + 3;
580

    
581
    c=d=e=-1;
582
    while(off-- > 0){
583
        c=d; d=e;
584
        e= get_byte(pb);
585
        if(c == 0x82 && !d && !e)
586
            break;
587
    }
588

    
589
    if (c != 0x82) {
590
        if (!url_feof(pb))
591
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
592
    }
593
    if ((c & 0x8f) == 0x82) {
594
        if (d || e) {
595
            if (!url_feof(pb))
596
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
597
            return -1;
598
        }
599
        c= get_byte(pb);
600
        d= get_byte(pb);
601
        rsize+=3;
602
    }else{
603
        url_fseek(pb, -1, SEEK_CUR); //FIXME
604
    }
605

    
606
    asf->packet_flags    = c;
607
    asf->packet_property = d;
608

    
609
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
610
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
611
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
612

    
613
    //the following checks prevent overflows and infinite loops
614
    if(packet_length >= (1U<<29)){
615
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
616
        return -1;
617
    }
618
    if(padsize >= packet_length){
619
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
620
        return -1;
621
    }
622

    
623
    asf->packet_timestamp = get_le32(pb);
624
    get_le16(pb); /* duration */
625
    // rsize has at least 11 bytes which have to be present
626

    
627
    if (asf->packet_flags & 0x01) {
628
        asf->packet_segsizetype = get_byte(pb); rsize++;
629
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
630
    } else {
631
        asf->packet_segments = 1;
632
        asf->packet_segsizetype = 0x80;
633
    }
634
    asf->packet_size_left = packet_length - padsize - rsize;
635
    if (packet_length < asf->hdr.min_pktsize)
636
        padsize += asf->hdr.min_pktsize - packet_length;
637
    asf->packet_padsize = padsize;
638
#ifdef DEBUG
639
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
640
#endif
641
    return 0;
642
}
643

    
644
/**
645
 *
646
 * @return <0 if error
647
 */
648
static int asf_read_frame_header(AVFormatContext *s){
649
    ASFContext *asf = s->priv_data;
650
    ByteIOContext *pb = s->pb;
651
    int rsize = 1;
652
    int num = get_byte(pb);
653
    int64_t ts0, ts1;
654

    
655
    asf->packet_segments--;
656
    asf->packet_key_frame = num >> 7;
657
    asf->stream_index = asf->asfid2avid[num & 0x7f];
658
    // sequence should be ignored!
659
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
660
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
661
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
662
//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);
663
    if (asf->packet_replic_size >= 8) {
664
        asf->packet_obj_size = get_le32(pb);
665
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
666
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
667
            return -1;
668
        }
669
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
670
        if(asf->packet_replic_size >= 8+38+4){
671
//            for(i=0; i<asf->packet_replic_size-8; i++)
672
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
673
//            av_log(s, AV_LOG_DEBUG, "\n");
674
            url_fskip(pb, 10);
675
            ts0= get_le64(pb);
676
            ts1= get_le64(pb);
677
            url_fskip(pb, 12);
678
            get_le32(pb);
679
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
680
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
681
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
682
        }else
683
            url_fskip(pb, asf->packet_replic_size - 8);
684
        rsize += asf->packet_replic_size; // FIXME - check validity
685
    } else if (asf->packet_replic_size==1){
686
        // multipacket - frag_offset is beginning timestamp
687
        asf->packet_time_start = asf->packet_frag_offset;
688
        asf->packet_frag_offset = 0;
689
        asf->packet_frag_timestamp = asf->packet_timestamp;
690

    
691
        asf->packet_time_delta = get_byte(pb);
692
        rsize++;
693
    }else if(asf->packet_replic_size!=0){
694
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
695
        return -1;
696
    }
697
    if (asf->packet_flags & 0x01) {
698
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
699
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
700
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
701
            return -1;
702
        }
703
        //printf("Fragsize %d\n", asf->packet_frag_size);
704
    } else {
705
        asf->packet_frag_size = asf->packet_size_left - rsize;
706
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
707
    }
708
    if (asf->packet_replic_size == 1) {
709
        asf->packet_multi_size = asf->packet_frag_size;
710
        if (asf->packet_multi_size > asf->packet_size_left)
711
            return -1;
712
    }
713
    asf->packet_size_left -= rsize;
714
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
715

    
716
    return 0;
717
}
718

    
719
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
720
{
721
    ASFContext *asf = s->priv_data;
722
    ASFStream *asf_st = 0;
723
    ByteIOContext *pb = s->pb;
724
    //static int pc = 0;
725
    for (;;) {
726
        if(url_feof(pb))
727
            return AVERROR(EIO);
728
        if (asf->packet_size_left < FRAME_HEADER_SIZE
729
            || asf->packet_segments < 1) {
730
            //asf->packet_size_left <= asf->packet_padsize) {
731
            int ret = asf->packet_size_left + asf->packet_padsize;
732
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
733
            assert(ret>=0);
734
            /* fail safe */
735
            url_fskip(pb, ret);
736

    
737
            asf->packet_pos= url_ftell(s->pb);
738
            if (asf->data_object_size != (uint64_t)-1 &&
739
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
740
                return AVERROR(EIO); /* Do not exceed the size of the data object */
741
            ret = asf_get_packet(s);
742
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
743
            if (ret < 0)
744
                assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
745
            asf->packet_time_start = 0;
746
            continue;
747
        }
748
        if (asf->packet_time_start == 0) {
749
            if(asf_read_frame_header(s) < 0){
750
                asf->packet_segments= 0;
751
                continue;
752
            }
753
            if (asf->stream_index < 0
754
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
755
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
756
                ) {
757
                asf->packet_time_start = 0;
758
                /* unhandled packet (should not happen) */
759
                url_fskip(pb, asf->packet_frag_size);
760
                asf->packet_size_left -= asf->packet_frag_size;
761
                if(asf->stream_index < 0)
762
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
763
                continue;
764
            }
765
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
766
        }
767
        asf_st = asf->asf_st;
768

    
769
        if (asf->packet_replic_size == 1) {
770
            // frag_offset is here used as the beginning timestamp
771
            asf->packet_frag_timestamp = asf->packet_time_start;
772
            asf->packet_time_start += asf->packet_time_delta;
773
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
774
            asf->packet_size_left--;
775
            asf->packet_multi_size--;
776
            if (asf->packet_multi_size < asf->packet_obj_size)
777
            {
778
                asf->packet_time_start = 0;
779
                url_fskip(pb, asf->packet_multi_size);
780
                asf->packet_size_left -= asf->packet_multi_size;
781
                continue;
782
            }
783
            asf->packet_multi_size -= asf->packet_obj_size;
784
            //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);
785
        }
786
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
787
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
788
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
789
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
790
                asf_st->frag_offset, asf->packet_frag_size,
791
                asf->packet_obj_size, asf_st->pkt.size);
792
            asf->packet_obj_size= asf_st->pkt.size;
793
        }
794

    
795
        if (   asf_st->pkt.size != asf->packet_obj_size
796
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
797
            if(asf_st->pkt.data){
798
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
799
                asf_st->frag_offset = 0;
800
                av_free_packet(&asf_st->pkt);
801
            }
802
            /* new packet */
803
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
804
            asf_st->seq = asf->packet_seq;
805
            asf_st->pkt.pts = asf->packet_frag_timestamp;
806
            asf_st->pkt.stream_index = asf->stream_index;
807
            asf_st->pkt.pos =
808
            asf_st->packet_pos= asf->packet_pos;
809
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
810
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
811
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
812
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
813
                asf->packet_key_frame = 1;
814
            if (asf->packet_key_frame)
815
                asf_st->pkt.flags |= PKT_FLAG_KEY;
816
        }
817

    
818
        /* read data */
819
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
820
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
821
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
822
        asf->packet_size_left -= asf->packet_frag_size;
823
        if (asf->packet_size_left < 0)
824
            continue;
825

    
826
        if(   asf->packet_frag_offset >= asf_st->pkt.size
827
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
828
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
829
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
830
            continue;
831
        }
832

    
833
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
834
                   asf->packet_frag_size);
835
        if (s->key && s->keylen == 20)
836
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
837
                            asf->packet_frag_size);
838
        asf_st->frag_offset += asf->packet_frag_size;
839
        /* test if whole packet is read */
840
        if (asf_st->frag_offset == asf_st->pkt.size) {
841
            //workaround for macroshit radio DVR-MS files
842
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
843
               && asf_st->pkt.size > 100){
844
                int i;
845
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
846
                if(i == asf_st->pkt.size){
847
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
848
                    asf_st->frag_offset = 0;
849
                    av_free_packet(&asf_st->pkt);
850
                    continue;
851
                }
852
            }
853

    
854
            /* return packet */
855
            if (asf_st->ds_span > 1) {
856
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
857
                    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);
858
              }else{
859
                /* packet descrambling */
860
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
861
                if (newdata) {
862
                    int offset = 0;
863
                    while (offset < asf_st->pkt.size) {
864
                        int off = offset / asf_st->ds_chunk_size;
865
                        int row = off / asf_st->ds_span;
866
                        int col = off % asf_st->ds_span;
867
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
868
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
869

    
870
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
871
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
872
                        memcpy(newdata + offset,
873
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
874
                               asf_st->ds_chunk_size);
875
                        offset += asf_st->ds_chunk_size;
876
                    }
877
                    av_free(asf_st->pkt.data);
878
                    asf_st->pkt.data = newdata;
879
                }
880
              }
881
            }
882
            asf_st->frag_offset = 0;
883
            *pkt= asf_st->pkt;
884
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
885
            asf_st->pkt.size = 0;
886
            asf_st->pkt.data = 0;
887
            break; // packet completed
888
        }
889
    }
890
    return 0;
891
}
892

    
893
// Added to support seeking after packets have been read
894
// If information is not reset, read_packet fails due to
895
// leftover information from previous reads
896
static void asf_reset_header(AVFormatContext *s)
897
{
898
    ASFContext *asf = s->priv_data;
899
    ASFStream *asf_st;
900
    int i;
901

    
902
    asf->packet_nb_frames = 0;
903
    asf->packet_size_left = 0;
904
    asf->packet_segments = 0;
905
    asf->packet_flags = 0;
906
    asf->packet_property = 0;
907
    asf->packet_timestamp = 0;
908
    asf->packet_segsizetype = 0;
909
    asf->packet_segments = 0;
910
    asf->packet_seq = 0;
911
    asf->packet_replic_size = 0;
912
    asf->packet_key_frame = 0;
913
    asf->packet_padsize = 0;
914
    asf->packet_frag_offset = 0;
915
    asf->packet_frag_size = 0;
916
    asf->packet_frag_timestamp = 0;
917
    asf->packet_multi_size = 0;
918
    asf->packet_obj_size = 0;
919
    asf->packet_time_delta = 0;
920
    asf->packet_time_start = 0;
921

    
922
    for(i=0; i<s->nb_streams; i++){
923
        asf_st= s->streams[i]->priv_data;
924
        av_free_packet(&asf_st->pkt);
925
        asf_st->frag_offset=0;
926
        asf_st->seq=0;
927
    }
928
    asf->asf_st= NULL;
929
}
930

    
931
static int asf_read_close(AVFormatContext *s)
932
{
933
    int i;
934

    
935
    asf_reset_header(s);
936
    for(i=0;i<s->nb_streams;i++) {
937
        AVStream *st = s->streams[i];
938
        av_free(st->priv_data);
939
        av_free(st->codec->palctrl);
940
    }
941
    return 0;
942
}
943

    
944
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
945
{
946
    ASFContext *asf = s->priv_data;
947
    AVPacket pkt1, *pkt = &pkt1;
948
    ASFStream *asf_st;
949
    int64_t pts;
950
    int64_t pos= *ppos;
951
    int i;
952
    int64_t start_pos[s->nb_streams];
953

    
954
    for(i=0; i<s->nb_streams; i++){
955
        start_pos[i]= pos;
956
    }
957

    
958
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
959
    *ppos= pos;
960
    url_fseek(s->pb, pos, SEEK_SET);
961

    
962
//printf("asf_read_pts\n");
963
    asf_reset_header(s);
964
    for(;;){
965
        if (av_read_frame(s, pkt) < 0){
966
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
967
            return AV_NOPTS_VALUE;
968
        }
969

    
970
        pts= pkt->pts;
971

    
972
        av_free_packet(pkt);
973
        if(pkt->flags&PKT_FLAG_KEY){
974
            i= pkt->stream_index;
975

    
976
            asf_st= s->streams[i]->priv_data;
977

    
978
//            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
979
            pos= asf_st->packet_pos;
980

    
981
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
982
            start_pos[i]= asf_st->packet_pos + 1;
983

    
984
            if(pkt->stream_index == stream_index)
985
               break;
986
        }
987
    }
988

    
989
    *ppos= pos;
990
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
991

    
992
    return pts;
993
}
994

    
995
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
996
{
997
    GUID g;
998
    ASFContext *asf = s->priv_data;
999
    int64_t gsize, itime;
1000
    int64_t pos, current_pos, index_pts;
1001
    int i;
1002
    int pct,ict;
1003

    
1004
    current_pos = url_ftell(s->pb);
1005

    
1006
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1007
    get_guid(s->pb, &g);
1008
    if (!memcmp(&g, &index_guid, sizeof(GUID))) {
1009
        gsize = get_le64(s->pb);
1010
        get_guid(s->pb, &g);
1011
        itime=get_le64(s->pb);
1012
        pct=get_le32(s->pb);
1013
        ict=get_le32(s->pb);
1014
        av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1015

    
1016
        for (i=0;i<ict;i++){
1017
            int pktnum=get_le32(s->pb);
1018
            int pktct =get_le16(s->pb);
1019
            av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1020

    
1021
            pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1022
            index_pts=av_rescale(itime, i, 10000);
1023

    
1024
            av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1025
        }
1026
        asf->index_read= 1;
1027
    }
1028
    url_fseek(s->pb, current_pos, SEEK_SET);
1029
}
1030

    
1031
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1032
{
1033
    ASFContext *asf = s->priv_data;
1034
    AVStream *st = s->streams[stream_index];
1035
    int64_t pos;
1036
    int index;
1037

    
1038
    if (asf->packet_size <= 0)
1039
        return -1;
1040

    
1041
    /* Try using the protocol's read_seek if available */
1042
    if(s->pb) {
1043
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1044
        if(ret >= 0)
1045
            asf_reset_header(s);
1046
        if (ret != AVERROR(ENOSYS))
1047
            return ret;
1048
    }
1049

    
1050
    if (!asf->index_read)
1051
        asf_build_simple_index(s, stream_index);
1052

    
1053
    if(!(asf->index_read && st->index_entries)){
1054
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1055
            return -1;
1056
    }else{
1057
        index= av_index_search_timestamp(st, pts, flags);
1058
        if(index<0)
1059
            return -1;
1060

    
1061
        /* find the position */
1062
        pos = st->index_entries[index].pos;
1063
        pts = st->index_entries[index].timestamp;
1064

    
1065
    // various attempts to find key frame have failed so far
1066
    //    asf_reset_header(s);
1067
    //    url_fseek(s->pb, pos, SEEK_SET);
1068
    //    key_pos = pos;
1069
    //     for(i=0;i<16;i++){
1070
    //         pos = url_ftell(s->pb);
1071
    //         if (av_read_frame(s, &pkt) < 0){
1072
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1073
    //             return -1;
1074
    //         }
1075
    //         asf_st = s->streams[stream_index]->priv_data;
1076
    //         pos += st->parser->frame_offset;
1077
    //
1078
    //         if (pkt.size > b) {
1079
    //             b = pkt.size;
1080
    //             key_pos = pos;
1081
    //         }
1082
    //
1083
    //         av_free_packet(&pkt);
1084
    //     }
1085

    
1086
        /* do the seek */
1087
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1088
        url_fseek(s->pb, pos, SEEK_SET);
1089
    }
1090
    asf_reset_header(s);
1091
    return 0;
1092
}
1093

    
1094
AVInputFormat asf_demuxer = {
1095
    "asf",
1096
    "asf format",
1097
    sizeof(ASFContext),
1098
    asf_probe,
1099
    asf_read_header,
1100
    asf_read_packet,
1101
    asf_read_close,
1102
    asf_read_seek,
1103
    asf_read_pts,
1104
};