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ffmpeg / libavformat / asf.c @ 49ce700a

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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 int is_mms(ByteIOContext *pb)
112
{
113
    return url_fileno(pb) && url_fileno(pb)->prot &&
114
         !strcmp(url_fileno(pb)->prot->name, "mmsh");
115
}
116

    
117
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
118
{
119
    char* q = buf;
120
    len /= 2;
121
    while (len--) {
122
        uint8_t tmp;
123
        PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
124
    }
125
    *q = '\0';
126
}
127

    
128
static int asf_probe(AVProbeData *pd)
129
{
130
    /* check file header */
131
    if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
132
        return AVPROBE_SCORE_MAX;
133
    else
134
        return 0;
135
}
136

    
137
static int get_value(ByteIOContext *pb, int type){
138
    switch(type){
139
        case 2: return get_le32(pb);
140
        case 3: return get_le32(pb);
141
        case 4: return get_le64(pb);
142
        case 5: return get_le16(pb);
143
        default:return INT_MIN;
144
    }
145
}
146

    
147
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
148
{
149
    ASFContext *asf = s->priv_data;
150
    GUID g;
151
    ByteIOContext *pb = &s->pb;
152
    AVStream *st;
153
    ASFStream *asf_st;
154
    int size, i;
155
    int64_t gsize;
156
    AVRational dar[128];
157
    uint32_t bitrate[128];
158

    
159
    memset(dar, 0, sizeof(dar));
160
    memset(bitrate, 0, sizeof(bitrate));
161

    
162
    get_guid(pb, &g);
163
    if (memcmp(&g, &asf_header, sizeof(GUID)))
164
        goto fail;
165
    get_le64(pb);
166
    get_le32(pb);
167
    get_byte(pb);
168
    get_byte(pb);
169
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
170
    for(;;) {
171
        get_guid(pb, &g);
172
        gsize = get_le64(pb);
173
#ifdef DEBUG
174
        printf("%08"PRIx64": ", url_ftell(pb) - 24);
175
        print_guid(&g);
176
        printf("  size=0x%"PRIx64"\n", gsize);
177
#endif
178
        if (!memcmp(&g, &data_header, sizeof(GUID))) {
179
            asf->data_object_offset = url_ftell(pb);
180
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
181
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
182
                asf->data_object_size = gsize - 24;
183
            } else {
184
                asf->data_object_size = (uint64_t)-1;
185
            }
186
            break;
187
        }
188
        if (gsize < 24)
189
            goto fail;
190
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
191
            get_guid(pb, &asf->hdr.guid);
192
            asf->hdr.file_size          = get_le64(pb);
193
            asf->hdr.create_time        = get_le64(pb);
194
            asf->nb_packets             = get_le64(pb);
195
            asf->hdr.send_time          = get_le64(pb);
196
            asf->hdr.play_time          = get_le64(pb);
197
            asf->hdr.preroll            = get_le32(pb);
198
            asf->hdr.ignore             = get_le32(pb);
199
            asf->hdr.flags              = get_le32(pb);
200
            asf->hdr.min_pktsize        = get_le32(pb);
201
            asf->hdr.max_pktsize        = get_le32(pb);
202
            asf->hdr.max_bitrate        = get_le32(pb);
203
            asf->packet_size = asf->hdr.max_pktsize;
204
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
205
            int type, type_specific_size, sizeX;
206
            uint64_t total_size;
207
            unsigned int tag1;
208
            int64_t pos1, pos2, start_time;
209
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
210

    
211
            pos1 = url_ftell(pb);
212

    
213
            st = av_new_stream(s, 0);
214
            if (!st)
215
                goto fail;
216
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
217
            asf_st = av_mallocz(sizeof(ASFStream));
218
            if (!asf_st)
219
                goto fail;
220
            st->priv_data = asf_st;
221
            start_time = asf->hdr.preroll;
222

    
223
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
224
                st->duration = asf->hdr.send_time /
225
                    (10000000 / 1000) - start_time;
226
            }
227
            get_guid(pb, &g);
228

    
229
            test_for_ext_stream_audio = 0;
230
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
231
                type = CODEC_TYPE_AUDIO;
232
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
233
                type = CODEC_TYPE_VIDEO;
234
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
235
                type = CODEC_TYPE_UNKNOWN;
236
            } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
237
                test_for_ext_stream_audio = 1;
238
                type = CODEC_TYPE_UNKNOWN;
239
            } else {
240
                goto fail;
241
            }
242
            get_guid(pb, &g);
243
            total_size = get_le64(pb);
244
            type_specific_size = get_le32(pb);
245
            get_le32(pb);
246
            st->id = get_le16(pb) & 0x7f; /* stream id */
247
            // mapping of asf ID to AV stream ID;
248
            asf->asfid2avid[st->id] = s->nb_streams - 1;
249

    
250
            get_le32(pb);
251

    
252
            if (test_for_ext_stream_audio) {
253
                get_guid(pb, &g);
254
                if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
255
                    type = CODEC_TYPE_AUDIO;
256
                    is_dvr_ms_audio=1;
257
                    get_guid(pb, &g);
258
                    get_le32(pb);
259
                    get_le32(pb);
260
                    get_le32(pb);
261
                    get_guid(pb, &g);
262
                    get_le32(pb);
263
                }
264
            }
265

    
266
            st->codec->codec_type = type;
267
            if (type == CODEC_TYPE_AUDIO) {
268
                get_wav_header(pb, st->codec, type_specific_size);
269
                if (is_dvr_ms_audio) {
270
                    // codec_id and codec_tag are unreliable in dvr_ms
271
                    // files. Set them later by probing stream.
272
                    st->codec->codec_id = CODEC_ID_NONE;
273
                    st->codec->codec_tag = 0;
274
                }
275
                st->need_parsing = AVSTREAM_PARSE_FULL;
276
                /* We have to init the frame size at some point .... */
277
                pos2 = url_ftell(pb);
278
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
279
                    asf_st->ds_span = get_byte(pb);
280
                    asf_st->ds_packet_size = get_le16(pb);
281
                    asf_st->ds_chunk_size = get_le16(pb);
282
                    get_le16(pb); //ds_data_size
283
                    get_byte(pb); //ds_silence_data
284
                }
285
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
286
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
287
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
288
                if (asf_st->ds_span > 1) {
289
                    if (!asf_st->ds_chunk_size
290
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
291
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
292
                        asf_st->ds_span = 0; // disable descrambling
293
                }
294
                switch (st->codec->codec_id) {
295
                case CODEC_ID_MP3:
296
                    st->codec->frame_size = MPA_FRAME_SIZE;
297
                    break;
298
                case CODEC_ID_PCM_S16LE:
299
                case CODEC_ID_PCM_S16BE:
300
                case CODEC_ID_PCM_U16LE:
301
                case CODEC_ID_PCM_U16BE:
302
                case CODEC_ID_PCM_S8:
303
                case CODEC_ID_PCM_U8:
304
                case CODEC_ID_PCM_ALAW:
305
                case CODEC_ID_PCM_MULAW:
306
                    st->codec->frame_size = 1;
307
                    break;
308
                default:
309
                    /* This is probably wrong, but it prevents a crash later */
310
                    st->codec->frame_size = 1;
311
                    break;
312
                }
313
            } else if (type == CODEC_TYPE_VIDEO) {
314
                get_le32(pb);
315
                get_le32(pb);
316
                get_byte(pb);
317
                size = get_le16(pb); /* size */
318
                sizeX= get_le32(pb); /* size */
319
                st->codec->width = get_le32(pb);
320
                st->codec->height = get_le32(pb);
321
                /* not available for asf */
322
                get_le16(pb); /* panes */
323
                st->codec->bits_per_sample = get_le16(pb); /* depth */
324
                tag1 = get_le32(pb);
325
                url_fskip(pb, 20);
326
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
327
                size= sizeX;
328
                if (size > 40) {
329
                    st->codec->extradata_size = size - 40;
330
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
331
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
332
                }
333

    
334
        /* Extract palette from extradata if bpp <= 8 */
335
        /* This code assumes that extradata contains only palette */
336
        /* This is true for all paletted codecs implemented in ffmpeg */
337
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
338
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
339
#ifdef WORDS_BIGENDIAN
340
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
341
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
342
#else
343
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
344
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
345
#endif
346
            st->codec->palctrl->palette_changed = 1;
347
        }
348

    
349
                st->codec->codec_tag = tag1;
350
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
351
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
352
                    st->need_parsing = AVSTREAM_PARSE_FULL;
353
            }
354
            pos2 = url_ftell(pb);
355
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
356
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
357
            int len1, len2, len3, len4, len5;
358

    
359
            len1 = get_le16(pb);
360
            len2 = get_le16(pb);
361
            len3 = get_le16(pb);
362
            len4 = get_le16(pb);
363
            len5 = get_le16(pb);
364
            get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
365
            get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
366
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
367
            get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
368
            url_fskip(pb, len5);
369
        } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
370
            int stream_count = get_le16(pb);
371
            int j;
372

    
373
//            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
374
//            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
375
            for(j = 0; j < stream_count; j++) {
376
                int flags, bitrate, stream_id;
377

    
378
                flags= get_le16(pb);
379
                bitrate= get_le32(pb);
380
                stream_id= (flags & 0x7f);
381
//                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
382
                asf->stream_bitrates[stream_id]= bitrate;
383
            }
384
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
385
                int desc_count, i;
386

    
387
                desc_count = get_le16(pb);
388
                for(i=0;i<desc_count;i++)
389
                {
390
                        int name_len,value_type,value_len;
391
                        uint64_t value_num = 0;
392
                        char name[1024];
393

    
394
                        name_len = get_le16(pb);
395
                        get_str16_nolen(pb, name_len, name, sizeof(name));
396
                        value_type = get_le16(pb);
397
                        value_len = get_le16(pb);
398
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
399
                        {
400
                                if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
401
                                else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
402
                                else if(!strcmp(name,"WM/Track") && s->track == 0) {
403
                                    char track[8];
404
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
405
                                    s->track = strtol(track, NULL, 10) + 1;
406
                                }
407
                                else if(!strcmp(name,"WM/TrackNumber")) {
408
                                    char track[8];
409
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
410
                                    s->track = strtol(track, NULL, 10);
411
                                }
412
                                else url_fskip(pb, value_len);
413
                        }
414
                        if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
415
                        {
416
                                value_num= get_value(pb, value_type);
417
                                if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
418
                                if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
419
                        }
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
#ifdef CONFIG_MMSH_PROTOCOL
545
    /* Give info about ourselves to the mms protocol */
546
    if(is_mms(pb))
547
        ff_mms_set_stream_selection(url_fileno(pb), s);
548
#endif
549

    
550
    return 0;
551

    
552
 fail:
553
     for(i=0;i<s->nb_streams;i++) {
554
        AVStream *st = s->streams[i];
555
        if (st) {
556
            av_free(st->priv_data);
557
            av_free(st->codec->extradata);
558
        }
559
        av_free(st);
560
    }
561
    return -1;
562
}
563

    
564
#define DO_2BITS(bits, var, defval) \
565
    switch (bits & 3) \
566
    { \
567
    case 3: var = get_le32(pb); rsize += 4; break; \
568
    case 2: var = get_le16(pb); rsize += 2; break; \
569
    case 1: var = get_byte(pb); rsize++; break; \
570
    default: var = defval; break; \
571
    }
572

    
573
/**
574
 *
575
 * @return <0 in case of an error
576
 */
577
static int asf_get_packet(AVFormatContext *s)
578
{
579
    ASFContext *asf = s->priv_data;
580
    ByteIOContext *pb = &s->pb;
581
    uint32_t packet_length, padsize;
582
    int rsize = 8;
583
    int c, d, e, off;
584

    
585
    off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
586

    
587
    c=d=e=-1;
588
    while(off-- > 0){
589
        c=d; d=e;
590
        e= get_byte(pb);
591
        if(c == 0x82 && !d && !e)
592
            break;
593
    }
594

    
595
    if (c != 0x82) {
596
        if (!url_feof(pb))
597
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
598
    }
599
    if ((c & 0x8f) == 0x82) {
600
        if (d || e) {
601
            if (!url_feof(pb))
602
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
603
            return -1;
604
        }
605
        c= get_byte(pb);
606
        d= get_byte(pb);
607
        rsize+=3;
608
    }else{
609
        url_fseek(pb, -1, SEEK_CUR); //FIXME
610
    }
611

    
612
    asf->packet_flags    = c;
613
    asf->packet_property = d;
614

    
615
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
616
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
617
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
618

    
619
    //the following checks prevent overflows and infinite loops
620
    if(packet_length >= (1U<<29)){
621
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
622
        return -1;
623
    }
624
    if(padsize >= packet_length){
625
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
626
        return -1;
627
    }
628

    
629
    asf->packet_timestamp = get_le32(pb);
630
    get_le16(pb); /* duration */
631
    // rsize has at least 11 bytes which have to be present
632

    
633
    if (asf->packet_flags & 0x01) {
634
        asf->packet_segsizetype = get_byte(pb); rsize++;
635
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
636
    } else {
637
        asf->packet_segments = 1;
638
        asf->packet_segsizetype = 0x80;
639
    }
640
    asf->packet_size_left = packet_length - padsize - rsize;
641
    if (packet_length < asf->hdr.min_pktsize)
642
        padsize += asf->hdr.min_pktsize - packet_length;
643
    asf->packet_padsize = padsize;
644
#ifdef DEBUG
645
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
646
#endif
647
    return 0;
648
}
649

    
650
/**
651
 *
652
 * @return <0 if error
653
 */
654
static int asf_read_frame_header(AVFormatContext *s){
655
    ASFContext *asf = s->priv_data;
656
    ByteIOContext *pb = &s->pb;
657
    int rsize = 1;
658
    int num = get_byte(pb);
659
    int64_t ts0, ts1;
660

    
661
    asf->packet_segments--;
662
    asf->packet_key_frame = num >> 7;
663
    asf->stream_index = asf->asfid2avid[num & 0x7f];
664
    // sequence should be ignored!
665
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
666
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
667
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
668
//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);
669
    if (asf->packet_replic_size >= 8) {
670
        asf->packet_obj_size = get_le32(pb);
671
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
672
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
673
            return -1;
674
        }
675
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
676
        if(asf->packet_replic_size >= 8+38+4){
677
//            for(i=0; i<asf->packet_replic_size-8; i++)
678
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
679
//            av_log(s, AV_LOG_DEBUG, "\n");
680
            url_fskip(pb, 10);
681
            ts0= get_le64(pb);
682
            ts1= get_le64(pb);
683
            url_fskip(pb, 12);
684
            get_le32(pb);
685
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
686
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
687
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
688
        }else
689
            url_fskip(pb, asf->packet_replic_size - 8);
690
        rsize += asf->packet_replic_size; // FIXME - check validity
691
    } else if (asf->packet_replic_size==1){
692
        // multipacket - frag_offset is begining timestamp
693
        asf->packet_time_start = asf->packet_frag_offset;
694
        asf->packet_frag_offset = 0;
695
        asf->packet_frag_timestamp = asf->packet_timestamp;
696

    
697
        asf->packet_time_delta = get_byte(pb);
698
        rsize++;
699
    }else if(asf->packet_replic_size!=0){
700
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
701
        return -1;
702
    }
703
    if (asf->packet_flags & 0x01) {
704
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
705
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
706
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
707
            return -1;
708
        }
709
        //printf("Fragsize %d\n", asf->packet_frag_size);
710
    } else {
711
        asf->packet_frag_size = asf->packet_size_left - rsize;
712
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
713
    }
714
    if (asf->packet_replic_size == 1) {
715
        asf->packet_multi_size = asf->packet_frag_size;
716
        if (asf->packet_multi_size > asf->packet_size_left)
717
            return -1;
718
    }
719
    asf->packet_size_left -= rsize;
720
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
721

    
722
    return 0;
723
}
724

    
725
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
726
{
727
    ASFContext *asf = s->priv_data;
728
    ASFStream *asf_st = 0;
729
    ByteIOContext *pb = &s->pb;
730
    //static int pc = 0;
731
    for (;;) {
732
        if(url_feof(pb))
733
            return AVERROR(EIO);
734
        if (asf->packet_size_left < FRAME_HEADER_SIZE
735
            || asf->packet_segments < 1) {
736
            //asf->packet_size_left <= asf->packet_padsize) {
737
            int ret = asf->packet_size_left + asf->packet_padsize;
738
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
739
            assert(ret>=0);
740
            /* fail safe */
741
            url_fskip(pb, ret);
742

    
743
            asf->packet_pos= url_ftell(&s->pb);
744
            if (asf->data_object_size != (uint64_t)-1 &&
745
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
746
                return AVERROR(EIO); /* Do not exceed the size of the data object */
747
            ret = asf_get_packet(s);
748
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
749
            if (ret < 0)
750
                assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
751
            asf->packet_time_start = 0;
752
            continue;
753
        }
754
        if (asf->packet_time_start == 0) {
755
            if(asf_read_frame_header(s) < 0){
756
                asf->packet_segments= 0;
757
                continue;
758
            }
759
            if (asf->stream_index < 0
760
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
761
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
762
                ) {
763
                asf->packet_time_start = 0;
764
                /* unhandled packet (should not happen) */
765
                url_fskip(pb, asf->packet_frag_size);
766
                asf->packet_size_left -= asf->packet_frag_size;
767
                if(asf->stream_index < 0)
768
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
769
                continue;
770
            }
771
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
772
        }
773
        asf_st = asf->asf_st;
774

    
775
        if (asf->packet_replic_size == 1) {
776
            // frag_offset is here used as the begining timestamp
777
            asf->packet_frag_timestamp = asf->packet_time_start;
778
            asf->packet_time_start += asf->packet_time_delta;
779
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
780
            asf->packet_size_left--;
781
            asf->packet_multi_size--;
782
            if (asf->packet_multi_size < asf->packet_obj_size)
783
            {
784
                asf->packet_time_start = 0;
785
                url_fskip(pb, asf->packet_multi_size);
786
                asf->packet_size_left -= asf->packet_multi_size;
787
                continue;
788
            }
789
            asf->packet_multi_size -= asf->packet_obj_size;
790
            //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);
791
        }
792
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
793
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
794
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
795
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
796
                asf_st->frag_offset, asf->packet_frag_size,
797
                asf->packet_obj_size, asf_st->pkt.size);
798
            asf->packet_obj_size= asf_st->pkt.size;
799
        }
800

    
801
        if (   asf_st->pkt.size != asf->packet_obj_size
802
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
803
            if(asf_st->pkt.data){
804
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
805
                asf_st->frag_offset = 0;
806
                av_free_packet(&asf_st->pkt);
807
            }
808
            /* new packet */
809
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
810
            asf_st->seq = asf->packet_seq;
811
            asf_st->pkt.pts = asf->packet_frag_timestamp;
812
            asf_st->pkt.stream_index = asf->stream_index;
813
            asf_st->pkt.pos =
814
            asf_st->packet_pos= asf->packet_pos;
815
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
816
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
817
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
818
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
819
                asf->packet_key_frame = 1;
820
            if (asf->packet_key_frame)
821
                asf_st->pkt.flags |= PKT_FLAG_KEY;
822
        }
823

    
824
        /* read data */
825
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
826
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
827
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
828
        asf->packet_size_left -= asf->packet_frag_size;
829
        if (asf->packet_size_left < 0)
830
            continue;
831

    
832
        if(   asf->packet_frag_offset >= asf_st->pkt.size
833
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
834
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
835
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
836
            continue;
837
        }
838

    
839
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
840
                   asf->packet_frag_size);
841
        if (s->key && s->keylen == 20)
842
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
843
                            asf->packet_frag_size);
844
        asf_st->frag_offset += asf->packet_frag_size;
845
        /* test if whole packet is read */
846
        if (asf_st->frag_offset == asf_st->pkt.size) {
847
            //workaround for macroshit radio DVR-MS files
848
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
849
               && asf_st->pkt.size > 100){
850
                int i;
851
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
852
                if(i == asf_st->pkt.size){
853
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
854
                    asf_st->frag_offset = 0;
855
                    av_free_packet(&asf_st->pkt);
856
                    continue;
857
                }
858
            }
859

    
860
            /* return packet */
861
            if (asf_st->ds_span > 1) {
862
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
863
                    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);
864
              }else{
865
                /* packet descrambling */
866
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
867
                if (newdata) {
868
                    int offset = 0;
869
                    while (offset < asf_st->pkt.size) {
870
                        int off = offset / asf_st->ds_chunk_size;
871
                        int row = off / asf_st->ds_span;
872
                        int col = off % asf_st->ds_span;
873
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
874
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
875

    
876
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
877
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
878
                        memcpy(newdata + offset,
879
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
880
                               asf_st->ds_chunk_size);
881
                        offset += asf_st->ds_chunk_size;
882
                    }
883
                    av_free(asf_st->pkt.data);
884
                    asf_st->pkt.data = newdata;
885
                }
886
              }
887
            }
888
            asf_st->frag_offset = 0;
889
            *pkt= asf_st->pkt;
890
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
891
            asf_st->pkt.size = 0;
892
            asf_st->pkt.data = 0;
893
            break; // packet completed
894
        }
895
    }
896
    return 0;
897
}
898

    
899
// Added to support seeking after packets have been read
900
// If information is not reset, read_packet fails due to
901
// leftover information from previous reads
902
static void asf_reset_header(AVFormatContext *s)
903
{
904
    ASFContext *asf = s->priv_data;
905
    ASFStream *asf_st;
906
    int i;
907

    
908
    asf->packet_nb_frames = 0;
909
    asf->packet_size_left = 0;
910
    asf->packet_segments = 0;
911
    asf->packet_flags = 0;
912
    asf->packet_property = 0;
913
    asf->packet_timestamp = 0;
914
    asf->packet_segsizetype = 0;
915
    asf->packet_segments = 0;
916
    asf->packet_seq = 0;
917
    asf->packet_replic_size = 0;
918
    asf->packet_key_frame = 0;
919
    asf->packet_padsize = 0;
920
    asf->packet_frag_offset = 0;
921
    asf->packet_frag_size = 0;
922
    asf->packet_frag_timestamp = 0;
923
    asf->packet_multi_size = 0;
924
    asf->packet_obj_size = 0;
925
    asf->packet_time_delta = 0;
926
    asf->packet_time_start = 0;
927

    
928
    for(i=0; i<s->nb_streams; i++){
929
        asf_st= s->streams[i]->priv_data;
930
        av_free_packet(&asf_st->pkt);
931
        asf_st->frag_offset=0;
932
        asf_st->seq=0;
933
    }
934
    asf->asf_st= NULL;
935
}
936

    
937
static int asf_read_close(AVFormatContext *s)
938
{
939
    int i;
940

    
941
    asf_reset_header(s);
942
    for(i=0;i<s->nb_streams;i++) {
943
        AVStream *st = s->streams[i];
944
        av_free(st->priv_data);
945
        av_free(st->codec->palctrl);
946
    }
947
    return 0;
948
}
949

    
950
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
951
{
952
    ASFContext *asf = s->priv_data;
953
    AVPacket pkt1, *pkt = &pkt1;
954
    ASFStream *asf_st;
955
    int64_t pts;
956
    int64_t pos= *ppos;
957
    int i;
958
    int64_t start_pos[s->nb_streams];
959

    
960
    for(i=0; i<s->nb_streams; i++){
961
        start_pos[i]= pos;
962
    }
963

    
964
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
965
    *ppos= pos;
966
    url_fseek(&s->pb, pos, SEEK_SET);
967

    
968
//printf("asf_read_pts\n");
969
    asf_reset_header(s);
970
    for(;;){
971
        if (av_read_frame(s, pkt) < 0){
972
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
973
            return AV_NOPTS_VALUE;
974
        }
975

    
976
        pts= pkt->pts;
977

    
978
        av_free_packet(pkt);
979
        if(pkt->flags&PKT_FLAG_KEY){
980
            i= pkt->stream_index;
981

    
982
            asf_st= s->streams[i]->priv_data;
983

    
984
//            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
985
            pos= asf_st->packet_pos;
986

    
987
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
988
            start_pos[i]= asf_st->packet_pos + 1;
989

    
990
            if(pkt->stream_index == stream_index)
991
               break;
992
        }
993
    }
994

    
995
    *ppos= pos;
996
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
997

    
998
    return pts;
999
}
1000

    
1001
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1002
{
1003
    GUID g;
1004
    ASFContext *asf = s->priv_data;
1005
    int64_t gsize, itime;
1006
    int64_t pos, current_pos, index_pts;
1007
    int i;
1008
    int pct,ict;
1009

    
1010
    current_pos = url_ftell(&s->pb);
1011

    
1012
    url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1013
    get_guid(&s->pb, &g);
1014
    if (!memcmp(&g, &index_guid, sizeof(GUID))) {
1015
        gsize = get_le64(&s->pb);
1016
        get_guid(&s->pb, &g);
1017
        itime=get_le64(&s->pb);
1018
        pct=get_le32(&s->pb);
1019
        ict=get_le32(&s->pb);
1020
        av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1021

    
1022
        for (i=0;i<ict;i++){
1023
            int pktnum=get_le32(&s->pb);
1024
            int pktct =get_le16(&s->pb);
1025
            av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1026

    
1027
            pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1028
            index_pts=av_rescale(itime, i, 10000);
1029

    
1030
            av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1031
        }
1032
        asf->index_read= 1;
1033
    }
1034
    url_fseek(&s->pb, current_pos, SEEK_SET);
1035
}
1036

    
1037
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1038
{
1039
    ASFContext *asf = s->priv_data;
1040
    AVStream *st = s->streams[stream_index];
1041
    int64_t pos;
1042
    int index;
1043

    
1044
    if (asf->packet_size <= 0)
1045
        return -1;
1046

    
1047
    if (!asf->index_read)
1048
        asf_build_simple_index(s, stream_index);
1049

    
1050
    if(!(asf->index_read && st->index_entries)){
1051
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1052
            return -1;
1053
    }else{
1054
        index= av_index_search_timestamp(st, pts, flags);
1055
        if(index<0)
1056
            return -1;
1057

    
1058
        /* find the position */
1059
        pos = st->index_entries[index].pos;
1060
        pts = st->index_entries[index].timestamp;
1061

    
1062
    // various attempts to find key frame have failed so far
1063
    //    asf_reset_header(s);
1064
    //    url_fseek(&s->pb, pos, SEEK_SET);
1065
    //    key_pos = pos;
1066
    //     for(i=0;i<16;i++){
1067
    //         pos = url_ftell(&s->pb);
1068
    //         if (av_read_frame(s, &pkt) < 0){
1069
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1070
    //             return -1;
1071
    //         }
1072
    //         asf_st = s->streams[stream_index]->priv_data;
1073
    //         pos += st->parser->frame_offset;
1074
    //
1075
    //         if (pkt.size > b) {
1076
    //             b = pkt.size;
1077
    //             key_pos = pos;
1078
    //         }
1079
    //
1080
    //         av_free_packet(&pkt);
1081
    //     }
1082

    
1083
        /* do the seek */
1084
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1085
        url_fseek(&s->pb, pos, SEEK_SET);
1086
    }
1087
    asf_reset_header(s);
1088
    return 0;
1089
}
1090

    
1091
AVInputFormat asf_demuxer = {
1092
    "asf",
1093
    "asf format",
1094
    sizeof(ASFContext),
1095
    asf_probe,
1096
    asf_read_header,
1097
    asf_read_packet,
1098
    asf_read_close,
1099
    asf_read_seek,
1100
    asf_read_pts,
1101
};