aboutsummaryrefslogtreecommitdiffstats
path: root/libavutil/opt.c
blob: d169b63bc31a74e2611cdbaa85c504639eb38758 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
/*
 * AVOptions
 * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * AVOptions
 * @author Michael Niedermayer <michaelni@gmx.at>
 */

#include "avutil.h"
#include "avstring.h"
#include "common.h"
#include "opt.h"
#include "eval.h"
#include "dict.h"
#include "log.h"
#include "parseutils.h"
#include "pixdesc.h"
#include "mathematics.h"

#if FF_API_FIND_OPT
//FIXME order them and do a bin search
const AVOption *av_find_opt(void *v, const char *name, const char *unit, int mask, int flags)
{
    const AVOption *o = NULL;

    while ((o = av_next_option(v, o))) {
        if (!strcmp(o->name, name) && (!unit || (o->unit && !strcmp(o->unit, unit))) && (o->flags & mask) == flags)
            return o;
    }
    return NULL;
}
#endif

#if FF_API_OLD_AVOPTIONS
const AVOption *av_next_option(void *obj, const AVOption *last)
{
    return av_opt_next(obj, last);
}
#endif

const AVOption *av_opt_next(void *obj, const AVOption *last)
{
    AVClass *class = *(AVClass**)obj;
    if (!last && class->option && class->option[0].name)
        return class->option;
    if (last && last[1].name)           return ++last;
    return NULL;
}

static int read_number(const AVOption *o, void *dst, double *num, int *den, int64_t *intnum)
{
    switch (o->type) {
    case AV_OPT_TYPE_FLAGS:     *intnum = *(unsigned int*)dst;return 0;
    case AV_OPT_TYPE_INT:       *intnum = *(int         *)dst;return 0;
    case AV_OPT_TYPE_INT64:     *intnum = *(int64_t     *)dst;return 0;
    case AV_OPT_TYPE_FLOAT:     *num    = *(float       *)dst;return 0;
    case AV_OPT_TYPE_DOUBLE:    *num    = *(double      *)dst;return 0;
    case AV_OPT_TYPE_RATIONAL:  *intnum = ((AVRational*)dst)->num;
                                *den    = ((AVRational*)dst)->den;
                                                        return 0;
    case AV_OPT_TYPE_CONST:     *num    = o->default_val.dbl; return 0;
    }
    return AVERROR(EINVAL);
}

static int write_number(void *obj, const AVOption *o, void *dst, double num, int den, int64_t intnum)
{
    if (o->max*den < num*intnum || o->min*den > num*intnum) {
        av_log(obj, AV_LOG_ERROR, "Value %f for parameter '%s' out of range\n",
               num*intnum/den, o->name);
        return AVERROR(ERANGE);
    }

    switch (o->type) {
    case AV_OPT_TYPE_FLAGS:
    case AV_OPT_TYPE_INT:   *(int       *)dst= llrint(num/den)*intnum; break;
    case AV_OPT_TYPE_INT64: *(int64_t   *)dst= llrint(num/den)*intnum; break;
    case AV_OPT_TYPE_FLOAT: *(float     *)dst= num*intnum/den;         break;
    case AV_OPT_TYPE_DOUBLE:*(double    *)dst= num*intnum/den;         break;
    case AV_OPT_TYPE_RATIONAL:
        if ((int)num == num) *(AVRational*)dst= (AVRational){num*intnum, den};
        else                 *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);
        break;
    default:
        return AVERROR(EINVAL);
    }
    return 0;
}

static const double const_values[] = {
    M_PI,
    M_E,
    FF_QP2LAMBDA,
    0
};

static const char * const const_names[] = {
    "PI",
    "E",
    "QP2LAMBDA",
    0
};

static int hexchar2int(char c) {
    if (c >= '0' && c <= '9') return c - '0';
    if (c >= 'a' && c <= 'f') return c - 'a' + 10;
    if (c >= 'A' && c <= 'F') return c - 'A' + 10;
    return -1;
}

static int set_string_binary(void *obj, const AVOption *o, const char *val, uint8_t **dst)
{
    int *lendst = (int *)(dst + 1);
    uint8_t *bin, *ptr;
    int len = strlen(val);

    av_freep(dst);
    *lendst = 0;

    if (len & 1)
        return AVERROR(EINVAL);
    len /= 2;

    ptr = bin = av_malloc(len);
    while (*val) {
        int a = hexchar2int(*val++);
        int b = hexchar2int(*val++);
        if (a < 0 || b < 0) {
            av_free(bin);
            return AVERROR(EINVAL);
        }
        *ptr++ = (a << 4) | b;
    }
    *dst = bin;
    *lendst = len;

    return 0;
}

static int set_string(void *obj, const AVOption *o, const char *val, uint8_t **dst)
{
    av_freep(dst);
    *dst = av_strdup(val);
    return 0;
}

#define DEFAULT_NUMVAL(opt) ((opt->type == AV_OPT_TYPE_INT64) ?               \
                             opt->default_val.i64 : opt->default_val.dbl)

static int set_string_number(void *obj, const AVOption *o, const char *val, void *dst)
{
    int ret = 0, notfirst = 0;
    for (;;) {
        int i, den = 1;
        char buf[256];
        int cmd = 0;
        double d, num = 1;
        int64_t intnum = 1;

        if (*val == '+' || *val == '-')
            cmd = *(val++);

        for (i = 0; i < sizeof(buf) - 1 && val[i] && val[i] != '+' && val[i] != '-'; i++)
            buf[i] = val[i];
        buf[i] = 0;

        {
            const AVOption *o_named = av_opt_find(obj, buf, o->unit, 0, 0);
            if (o_named && o_named->type == AV_OPT_TYPE_CONST)
                d = DEFAULT_NUMVAL(o_named);
            else if (!strcmp(buf, "default")) d = DEFAULT_NUMVAL(o);
            else if (!strcmp(buf, "max"    )) d = o->max;
            else if (!strcmp(buf, "min"    )) d = o->min;
            else if (!strcmp(buf, "none"   )) d = 0;
            else if (!strcmp(buf, "all"    )) d = ~0;
            else {
                int res = av_expr_parse_and_eval(&d, buf, const_names, const_values, NULL, NULL, NULL, NULL, NULL, 0, obj);
                if (res < 0) {
                    av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\"\n", val);
                    return res;
                }
            }
        }
        if (o->type == AV_OPT_TYPE_FLAGS) {
            read_number(o, dst, NULL, NULL, &intnum);
            if      (cmd == '+') d = intnum | (int64_t)d;
            else if (cmd == '-') d = intnum &~(int64_t)d;
        } else {
            read_number(o, dst, &num, &den, &intnum);
            if      (cmd == '+') d = notfirst*num*intnum/den + d;
            else if (cmd == '-') d = notfirst*num*intnum/den - d;
        }

        if ((ret = write_number(obj, o, dst, d, 1, 1)) < 0)
            return ret;
        val += i;
        if (!*val)
            return 0;
        notfirst = 1;
    }

    return 0;
}

#if FF_API_OLD_AVOPTIONS
int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out)
{
    const AVOption *o = av_opt_find(obj, name, NULL, 0, 0);
    if (o_out)
        *o_out = o;
    return av_opt_set(obj, name, val, 0);
}
#endif

int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
{
    int ret;
    void *dst, *target_obj;
    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
    if (!o || !target_obj)
        return AVERROR_OPTION_NOT_FOUND;
    if (!val && o->type != AV_OPT_TYPE_STRING)
        return AVERROR(EINVAL);

    dst = ((uint8_t*)target_obj) + o->offset;
    switch (o->type) {
    case AV_OPT_TYPE_STRING:   return set_string(obj, o, val, dst);
    case AV_OPT_TYPE_BINARY:   return set_string_binary(obj, o, val, dst);
    case AV_OPT_TYPE_FLAGS:
    case AV_OPT_TYPE_INT:
    case AV_OPT_TYPE_INT64:
    case AV_OPT_TYPE_FLOAT:
    case AV_OPT_TYPE_DOUBLE:
    case AV_OPT_TYPE_RATIONAL: return set_string_number(obj, o, val, dst);
    case AV_OPT_TYPE_IMAGE_SIZE:
        ret = av_parse_video_size(dst, ((int *)dst) + 1, val);
        if (ret < 0)
            av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as image size\n", val);
        return ret;
    case AV_OPT_TYPE_PIXEL_FMT:
        ret = av_get_pix_fmt(val);
        if (ret == PIX_FMT_NONE) {
            char *tail;
            ret = strtol(val, &tail, 0);
            if (*tail || (unsigned)ret >= PIX_FMT_NB) {
                av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as pixel format\n", val);
                return AVERROR(EINVAL);
            }
        }
        *(enum PixelFormat *)dst = ret;
        return 0;
    }

    av_log(obj, AV_LOG_ERROR, "Invalid option type.\n");
    return AVERROR(EINVAL);
}

#define OPT_EVAL_NUMBER(name, opttype, vartype)\
    int av_opt_eval_ ## name(void *obj, const AVOption *o, const char *val, vartype *name ## _out)\
    {\
        if (!o || o->type != opttype)\
            return AVERROR(EINVAL);\
        return set_string_number(obj, o, val, name ## _out);\
    }

OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)
OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)
OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)
OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)
OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)
OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

static int set_number(void *obj, const char *name, double num, int den, int64_t intnum,
                                  int search_flags)
{
    void *dst, *target_obj;
    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);

    if (!o || !target_obj)
        return AVERROR_OPTION_NOT_FOUND;

    dst = ((uint8_t*)target_obj) + o->offset;
    return write_number(obj, o, dst, num, den, intnum);
}

#if FF_API_OLD_AVOPTIONS
const AVOption *av_set_double(void *obj, const char *name, double n)
{
    const AVOption *o = av_opt_find(obj, name, NULL, 0, 0);
    if (set_number(obj, name, n, 1, 1, 0) < 0)
        return NULL;
    return o;
}

const AVOption *av_set_q(void *obj, const char *name, AVRational n)
{
    const AVOption *o = av_opt_find(obj, name, NULL, 0, 0);
    if (set_number(obj, name, n.num, n.den, 1, 0) < 0)
        return NULL;
    return o;
}

const AVOption *av_set_int(void *obj, const char *name, int64_t n)
{
    const AVOption *o = av_opt_find(obj, name, NULL, 0, 0);
    if (set_number(obj, name, 1, 1, n, 0) < 0)
        return NULL;
    return o;
}
#endif

int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
{
    return set_number(obj, name, 1, 1, val, search_flags);
}

int av_opt_set_double(void *obj, const char *name, double val, int search_flags)
{
    return set_number(obj, name, val, 1, 1, search_flags);
}

int av_opt_set_q(void *obj, const char *name, AVRational val, int search_flags)
{
    return set_number(obj, name, val.num, val.den, 1, search_flags);
}

int av_opt_set_bin(void *obj, const char *name, const uint8_t *val, int len, int search_flags)
{
    void *target_obj;
    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
    uint8_t *ptr;
    uint8_t **dst;
    int *lendst;

    if (!o || !target_obj)
        return AVERROR_OPTION_NOT_FOUND;

    if (o->type != AV_OPT_TYPE_BINARY)
        return AVERROR(EINVAL);

    ptr = av_malloc(len);
    if (!ptr)
        return AVERROR(ENOMEM);

    dst = (uint8_t **)(((uint8_t *)target_obj) + o->offset);
    lendst = (int *)(dst + 1);

    av_free(*dst);
    *dst = ptr;
    *lendst = len;
    memcpy(ptr, val, len);

    return 0;
}

#if FF_API_OLD_AVOPTIONS
/**
 *
 * @param buf a buffer which is used for returning non string values as strings, can be NULL
 * @param buf_len allocated length in bytes of buf
 */
const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len)
{
    const AVOption *o = av_opt_find(obj, name, NULL, 0, AV_OPT_SEARCH_CHILDREN);
    void *dst;
    uint8_t *bin;
    int len, i;
    if (!o)
        return NULL;
    if (o->type != AV_OPT_TYPE_STRING && (!buf || !buf_len))
        return NULL;

    dst= ((uint8_t*)obj) + o->offset;
    if (o_out) *o_out= o;

    switch (o->type) {
    case AV_OPT_TYPE_FLAGS:     snprintf(buf, buf_len, "0x%08X",*(int    *)dst);break;
    case AV_OPT_TYPE_INT:       snprintf(buf, buf_len, "%d" , *(int    *)dst);break;
    case AV_OPT_TYPE_INT64:     snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
    case AV_OPT_TYPE_FLOAT:     snprintf(buf, buf_len, "%f" , *(float  *)dst);break;
    case AV_OPT_TYPE_DOUBLE:    snprintf(buf, buf_len, "%f" , *(double *)dst);break;
    case AV_OPT_TYPE_RATIONAL:  snprintf(buf, buf_len, "%d/%d", ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;
    case AV_OPT_TYPE_CONST:     snprintf(buf, buf_len, "%f" , o->default_val.dbl);break;
    case AV_OPT_TYPE_STRING:    return *(void**)dst;
    case AV_OPT_TYPE_BINARY:
        len = *(int*)(((uint8_t *)dst) + sizeof(uint8_t *));
        if (len >= (buf_len + 1)/2) return NULL;
        bin = *(uint8_t**)dst;
        for (i = 0; i < len; i++) snprintf(buf + i*2, 3, "%02X", bin[i]);
        break;
    default: return NULL;
    }
    return buf;
}
#endif

int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
{
    void *dst, *target_obj;
    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
    uint8_t *bin, buf[128];
    int len, i, ret;

    if (!o || !target_obj || (o->offset<=0 && o->type != AV_OPT_TYPE_CONST))
        return AVERROR_OPTION_NOT_FOUND;

    dst = (uint8_t*)target_obj + o->offset;

    buf[0] = 0;
    switch (o->type) {
    case AV_OPT_TYPE_FLAGS:     ret = snprintf(buf, sizeof(buf), "0x%08X",  *(int    *)dst);break;
    case AV_OPT_TYPE_INT:       ret = snprintf(buf, sizeof(buf), "%d" ,     *(int    *)dst);break;
    case AV_OPT_TYPE_INT64:     ret = snprintf(buf, sizeof(buf), "%"PRId64, *(int64_t*)dst);break;
    case AV_OPT_TYPE_FLOAT:     ret = snprintf(buf, sizeof(buf), "%f" ,     *(float  *)dst);break;
    case AV_OPT_TYPE_DOUBLE:    ret = snprintf(buf, sizeof(buf), "%f" ,     *(double *)dst);break;
    case AV_OPT_TYPE_RATIONAL:  ret = snprintf(buf, sizeof(buf), "%d/%d",   ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;
    case AV_OPT_TYPE_CONST:     ret = snprintf(buf, sizeof(buf), "%f" ,     o->default_val.dbl);break;
    case AV_OPT_TYPE_STRING:
        if (*(uint8_t**)dst)
            *out_val = av_strdup(*(uint8_t**)dst);
        else
            *out_val = av_strdup("");
        return 0;
    case AV_OPT_TYPE_BINARY:
        len = *(int*)(((uint8_t *)dst) + sizeof(uint8_t *));
        if ((uint64_t)len*2 + 1 > INT_MAX)
            return AVERROR(EINVAL);
        if (!(*out_val = av_malloc(len*2 + 1)))
            return AVERROR(ENOMEM);
        bin = *(uint8_t**)dst;
        for (i = 0; i < len; i++)
            snprintf(*out_val + i*2, 3, "%02X", bin[i]);
        return 0;
    case AV_OPT_TYPE_IMAGE_SIZE:
        ret = snprintf(buf, sizeof(buf), "%dx%d", ((int *)dst)[0], ((int *)dst)[1]);
        break;
    case AV_OPT_TYPE_PIXEL_FMT:
        ret = snprintf(buf, sizeof(buf), "%s", (char *)av_x_if_null(av_get_pix_fmt_name(*(enum PixelFormat *)dst), "?"));
        break;
    default:
        return AVERROR(EINVAL);
    }

    if (ret >= sizeof(buf))
        return AVERROR(EINVAL);
    *out_val = av_strdup(buf);
    return 0;
}

static int get_number(void *obj, const char *name, const AVOption **o_out, double *num, int *den, int64_t *intnum,
                      int search_flags)
{
    void *dst, *target_obj;
    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
    if (!o || !target_obj)
        goto error;

    dst = ((uint8_t*)target_obj) + o->offset;

    if (o_out) *o_out= o;

    return read_number(o, dst, num, den, intnum);

error:
    *den=*intnum=0;
    return -1;
}

#if FF_API_OLD_AVOPTIONS
double av_get_double(void *obj, const char *name, const AVOption **o_out)
{
    int64_t intnum=1;
    double num=1;
    int den=1;

    if (get_number(obj, name, o_out, &num, &den, &intnum, 0) < 0)
        return NAN;
    return num*intnum/den;
}

AVRational av_get_q(void *obj, const char *name, const AVOption **o_out)
{
    int64_t intnum=1;
    double num=1;
    int den=1;

    if (get_number(obj, name, o_out, &num, &den, &intnum, 0) < 0)
        return (AVRational){0, 0};
    if (num == 1.0 && (int)intnum == intnum)
        return (AVRational){intnum, den};
    else
        return av_d2q(num*intnum/den, 1<<24);
}

int64_t av_get_int(void *obj, const char *name, const AVOption **o_out)
{
    int64_t intnum=1;
    double num=1;
    int den=1;

    if (get_number(obj, name, o_out, &num, &den, &intnum, 0) < 0)
        return -1;
    return num*intnum/den;
}
#endif

int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *out_val)
{
    int64_t intnum = 1;
    double     num = 1;
    int   ret, den = 1;

    if ((ret = get_number(obj, name, NULL, &num, &den, &intnum, search_flags)) < 0)
        return ret;
    *out_val = num*intnum/den;
    return 0;
}

int av_opt_get_double(void *obj, const char *name, int search_flags, double *out_val)
{
    int64_t intnum = 1;
    double     num = 1;
    int   ret, den = 1;

    if ((ret = get_number(obj, name, NULL, &num, &den, &intnum, search_flags)) < 0)
        return ret;
    *out_val = num*intnum/den;
    return 0;
}

int av_opt_get_q(void *obj, const char *name, int search_flags, AVRational *out_val)
{
    int64_t intnum = 1;
    double     num = 1;
    int   ret, den = 1;

    if ((ret = get_number(obj, name, NULL, &num, &den, &intnum, search_flags)) < 0)
        return ret;

    if (num == 1.0 && (int)intnum == intnum)
        *out_val = (AVRational){intnum, den};
    else
        *out_val = av_d2q(num*intnum/den, 1<<24);
    return 0;
}

int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name)
{
    const AVOption *field = av_opt_find(obj, field_name, NULL, 0, 0);
    const AVOption *flag  = av_opt_find(obj, flag_name,
                                        field ? field->unit : NULL, 0, 0);
    int64_t res;

    if (!field || !flag || flag->type != AV_OPT_TYPE_CONST ||
        av_opt_get_int(obj, field_name, 0, &res) < 0)
        return 0;
    return res & (int) flag->default_val.dbl;
}

static void opt_list(void *obj, void *av_log_obj, const char *unit,
                     int req_flags, int rej_flags)
{
    const AVOption *opt=NULL;

    while ((opt = av_opt_next(obj, opt))) {
        if (!(opt->flags & req_flags) || (opt->flags & rej_flags))
            continue;

        /* Don't print CONST's on level one.
         * Don't print anything but CONST's on level two.
         * Only print items from the requested unit.
         */
        if (!unit && opt->type==AV_OPT_TYPE_CONST)
            continue;
        else if (unit && opt->type!=AV_OPT_TYPE_CONST)
            continue;
        else if (unit && opt->type==AV_OPT_TYPE_CONST && strcmp(unit, opt->unit))
            continue;
        else if (unit && opt->type == AV_OPT_TYPE_CONST)
            av_log(av_log_obj, AV_LOG_INFO, "   %-15s ", opt->name);
        else
            av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);

        switch (opt->type) {
            case AV_OPT_TYPE_FLAGS:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>");
                break;
            case AV_OPT_TYPE_INT:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<int>");
                break;
            case AV_OPT_TYPE_INT64:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>");
                break;
            case AV_OPT_TYPE_DOUBLE:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<double>");
                break;
            case AV_OPT_TYPE_FLOAT:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<float>");
                break;
            case AV_OPT_TYPE_STRING:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<string>");
                break;
            case AV_OPT_TYPE_RATIONAL:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>");
                break;
            case AV_OPT_TYPE_BINARY:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<binary>");
                break;
            case AV_OPT_TYPE_IMAGE_SIZE:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<image_size>");
                break;
            case AV_OPT_TYPE_PIXEL_FMT:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<pix_fmt>");
                break;
            case AV_OPT_TYPE_CONST:
            default:
                av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "");
                break;
        }
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_FILTERING_PARAM)? 'F' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM   ) ? 'V' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM   ) ? 'A' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');

        if (opt->help)
            av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
        av_log(av_log_obj, AV_LOG_INFO, "\n");
        if (opt->unit && opt->type != AV_OPT_TYPE_CONST) {
            opt_list(obj, av_log_obj, opt->unit, req_flags, rej_flags);
        }
    }
}

int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags)
{
    if (!obj)
        return -1;

    av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);

    opt_list(obj, av_log_obj, NULL, req_flags, rej_flags);

    return 0;
}

void av_opt_set_defaults(void *s)
{
#if FF_API_OLD_AVOPTIONS
    av_opt_set_defaults2(s, 0, 0);
}

void av_opt_set_defaults2(void *s, int mask, int flags)
{
#endif
    const AVOption *opt = NULL;
    while ((opt = av_opt_next(s, opt)) != NULL) {
#if FF_API_OLD_AVOPTIONS
        if ((opt->flags & mask) != flags)
            continue;
#endif
        switch (opt->type) {
            case AV_OPT_TYPE_CONST:
                /* Nothing to be done here */
            break;
            case AV_OPT_TYPE_FLAGS:
            case AV_OPT_TYPE_INT: {
                int val;
                val = opt->default_val.dbl;
                av_opt_set_int(s, opt->name, val, 0);
            }
            break;
            case AV_OPT_TYPE_INT64:
                av_opt_set_int(s, opt->name, opt->default_val.i64, 0);
            break;
            case AV_OPT_TYPE_DOUBLE:
            case AV_OPT_TYPE_FLOAT: {
                double val;
                val = opt->default_val.dbl;
                av_opt_set_double(s, opt->name, val, 0);
            }
            break;
            case AV_OPT_TYPE_RATIONAL: {
                AVRational val;
                val = av_d2q(opt->default_val.dbl, INT_MAX);
                av_opt_set_q(s, opt->name, val, 0);
            }
            break;
            case AV_OPT_TYPE_STRING:
            case AV_OPT_TYPE_IMAGE_SIZE:
            case AV_OPT_TYPE_PIXEL_FMT:
                av_opt_set(s, opt->name, opt->default_val.str, 0);
                break;
            case AV_OPT_TYPE_BINARY:
                /* Cannot set default for binary */
            break;
            default:
                av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n", opt->type, opt->name);
        }
    }
}

/**
 * Store the value in the field in ctx that is named like key.
 * ctx must be an AVClass context, storing is done using AVOptions.
 *
 * @param buf the string to parse, buf will be updated to point at the
 * separator just after the parsed key/value pair
 * @param key_val_sep a 0-terminated list of characters used to
 * separate key from value
 * @param pairs_sep a 0-terminated list of characters used to separate
 * two pairs from each other
 * @return 0 if the key/value pair has been successfully parsed and
 * set, or a negative value corresponding to an AVERROR code in case
 * of error:
 * AVERROR(EINVAL) if the key/value pair cannot be parsed,
 * the error code issued by av_opt_set() if the key/value pair
 * cannot be set
 */
static int parse_key_value_pair(void *ctx, const char **buf,
                                const char *key_val_sep, const char *pairs_sep)
{
    char *key = av_get_token(buf, key_val_sep);
    char *val;
    int ret;

    if (*key && strspn(*buf, key_val_sep)) {
        (*buf)++;
        val = av_get_token(buf, pairs_sep);
    } else {
        av_log(ctx, AV_LOG_ERROR, "Missing key or no key/value separator found after key '%s'\n", key);
        av_free(key);
        return AVERROR(EINVAL);
    }

    av_log(ctx, AV_LOG_DEBUG, "Setting entry with key '%s' to value '%s'\n", key, val);

    ret = av_opt_set(ctx, key, val, 0);
    if (ret == AVERROR_OPTION_NOT_FOUND)
        av_log(ctx, AV_LOG_ERROR, "Key '%s' not found.\n", key);

    av_free(key);
    av_free(val);
    return ret;
}

int av_set_options_string(void *ctx, const char *opts,
                          const char *key_val_sep, const char *pairs_sep)
{
    int ret, count = 0;

    if (!opts)
        return 0;

    while (*opts) {
        if ((ret = parse_key_value_pair(ctx, &opts, key_val_sep, pairs_sep)) < 0)
            return ret;
        count++;

        if (*opts)
            opts++;
    }

    return count;
}

void av_opt_free(void *obj)
{
    const AVOption *o = NULL;
    while ((o = av_opt_next(obj, o)))
        if (o->type == AV_OPT_TYPE_STRING || o->type == AV_OPT_TYPE_BINARY)
            av_freep((uint8_t *)obj + o->offset);
}

int av_opt_set_dict(void *obj, AVDictionary **options)
{
    AVDictionaryEntry *t = NULL;
    AVDictionary    *tmp = NULL;
    int ret = 0;

    while ((t = av_dict_get(*options, "", t, AV_DICT_IGNORE_SUFFIX))) {
        ret = av_opt_set(obj, t->key, t->value, 0);
        if (ret == AVERROR_OPTION_NOT_FOUND)
            av_dict_set(&tmp, t->key, t->value, 0);
        else if (ret < 0) {
            av_log(obj, AV_LOG_ERROR, "Error setting option %s to value %s.\n", t->key, t->value);
            break;
        }
        ret = 0;
    }
    av_dict_free(options);
    *options = tmp;
    return ret;
}

const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
                            int opt_flags, int search_flags)
{
    return av_opt_find2(obj, name, unit, opt_flags, search_flags, NULL);
}

const AVOption *av_opt_find2(void *obj, const char *name, const char *unit,
                             int opt_flags, int search_flags, void **target_obj)
{
    const AVClass  *c;
    const AVOption *o = NULL;

    if(!obj)
        return NULL;

    c= *(AVClass**)obj;

    if (search_flags & AV_OPT_SEARCH_CHILDREN) {
        if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {
            const AVClass *child = NULL;
            while (child = av_opt_child_class_next(c, child))
                if (o = av_opt_find2(&child, name, unit, opt_flags, search_flags, NULL))
                    return o;
        } else {
            void *child = NULL;
            while (child = av_opt_child_next(obj, child))
                if (o = av_opt_find2(child, name, unit, opt_flags, search_flags, target_obj))
                    return o;
        }
    }

    while (o = av_opt_next(obj, o)) {
        if (!strcmp(o->name, name) && (o->flags & opt_flags) == opt_flags &&
            ((!unit && o->type != AV_OPT_TYPE_CONST) ||
             (unit  && o->type == AV_OPT_TYPE_CONST && o->unit && !strcmp(o->unit, unit)))) {
            if (target_obj) {
                if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))
                    *target_obj = obj;
                else
                    *target_obj = NULL;
            }
            return o;
        }
    }
    return NULL;
}

void *av_opt_child_next(void *obj, void *prev)
{
    const AVClass *c = *(AVClass**)obj;
    if (c->child_next)
        return c->child_next(obj, prev);
    return NULL;
}

const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev)
{
    if (parent->child_class_next)
        return parent->child_class_next(prev);
    return NULL;
}

void *av_opt_ptr(const AVClass *class, void *obj, const char *name)
{
    const AVOption *opt= av_opt_find2(&class, name, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ, NULL);
    if(!opt)
        return NULL;
    return (uint8_t*)obj + opt->offset;
}

#ifdef TEST

#undef printf

typedef struct TestContext
{
    const AVClass *class;
    int num;
    int toggle;
    char *string;
    int flags;
    AVRational rational;
    int w, h;
    enum PixelFormat pix_fmt;
} TestContext;

#define OFFSET(x) offsetof(TestContext, x)

#define TEST_FLAG_COOL 01
#define TEST_FLAG_LAME 02
#define TEST_FLAG_MU   04

static const AVOption test_options[]= {
{"num",      "set num",        OFFSET(num),      AV_OPT_TYPE_INT,      {0},              0,        100                 },
{"toggle",   "set toggle",     OFFSET(toggle),   AV_OPT_TYPE_INT,      {0},              0,        1                   },
{"rational", "set rational",   OFFSET(rational), AV_OPT_TYPE_RATIONAL, {0},              0,        10                  },
{"string",   "set string",     OFFSET(string),   AV_OPT_TYPE_STRING,   {0},              CHAR_MIN, CHAR_MAX            },
{"flags",    "set flags",      OFFSET(flags),    AV_OPT_TYPE_FLAGS,    {0},              0,        INT_MAX, 0, "flags" },
{"cool",     "set cool flag ", 0,                AV_OPT_TYPE_CONST,    {TEST_FLAG_COOL}, INT_MIN,  INT_MAX, 0, "flags" },
{"lame",     "set lame flag ", 0,                AV_OPT_TYPE_CONST,    {TEST_FLAG_LAME}, INT_MIN,  INT_MAX, 0, "flags" },
{"mu",       "set mu flag ",   0,                AV_OPT_TYPE_CONST,    {TEST_FLAG_MU},   INT_MIN,  INT_MAX, 0, "flags" },
{"size",     "set size",       OFFSET(w),        AV_OPT_TYPE_IMAGE_SIZE,{0},             0,        0                   },
{"pix_fmt",  "set pixfmt",     OFFSET(pix_fmt),  AV_OPT_TYPE_PIXEL_FMT,{0},              0,        0                   },
{NULL},
};

static const char *test_get_name(void *ctx)
{
    return "test";
}

static const AVClass test_class = {
    "TestContext",
    test_get_name,
    test_options
};

int main(void)
{
    int i;

    printf("\nTesting av_set_options_string()\n");
    {
        TestContext test_ctx = { 0 };
        const char *options[] = {
            "",
            ":",
            "=",
            "foo=:",
            ":=foo",
            "=foo",
            "foo=",
            "foo",
            "foo=val",
            "foo==val",
            "toggle=:",
            "string=:",
            "toggle=1 : foo",
            "toggle=100",
            "toggle==1",
            "flags=+mu-lame : num=42: toggle=0",
            "num=42 : string=blahblah",
            "rational=0 : rational=1/2 : rational=1/-1",
            "rational=-1/0",
            "size=1024x768",
            "size=pal",
            "size=bogus",
            "pix_fmt=yuv420p",
            "pix_fmt=2",
            "pix_fmt=bogus",
        };

        test_ctx.class = &test_class;
        av_opt_set_defaults(&test_ctx);
        test_ctx.string = av_strdup("default");

        av_log_set_level(AV_LOG_DEBUG);

        for (i=0; i < FF_ARRAY_ELEMS(options); i++) {
            av_log(&test_ctx, AV_LOG_DEBUG, "Setting options string '%s'\n", options[i]);
            if (av_set_options_string(&test_ctx, options[i], "=", ":") < 0)
                av_log(&test_ctx, AV_LOG_ERROR, "Error setting options string: '%s'\n", options[i]);
            printf("\n");
        }
        av_freep(&test_ctx.string);
    }

    return 0;
}

#endif