aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/opt.c
blob: 97b593cb2ff1095a63f6c66b68da4b5a04618529 (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
/*
 * 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 opt.c
 * AVOptions
 * @author Michael Niedermayer <michaelni@gmx.at>
 */

#include "avcodec.h"
#include "opt.h"
#include "eval.h"

//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){
    AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
    const AVOption *o= c->option;

    for(;o && o->name; o++){
        if(!strcmp(o->name, name) && (!unit || (o->unit && !strcmp(o->unit, unit))) && (o->flags & mask) == flags )
            return o;
    }
    return NULL;
}

const AVOption *av_next_option(void *obj, const AVOption *last){
    if(last && last[1].name) return ++last;
    else if(last)            return NULL;
    else                     return (*(AVClass**)obj)->option;
}

static const AVOption *av_set_number(void *obj, const char *name, double num, int den, int64_t intnum){
    const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
    void *dst;
    if(!o || o->offset<=0)
        return NULL;

    if(o->max*den < num*intnum || o->min*den > num*intnum) {
        av_log(NULL, AV_LOG_ERROR, "Value %lf for parameter '%s' out of range.\n", num, name);
        return NULL;
    }

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

    switch(o->type){
    case FF_OPT_TYPE_FLAGS:
    case FF_OPT_TYPE_INT:   *(int       *)dst= lrintf(num/den)*intnum; break;
    case FF_OPT_TYPE_INT64: *(int64_t   *)dst= lrintf(num/den)*intnum; break;
    case FF_OPT_TYPE_FLOAT: *(float     *)dst= num*intnum/den;         break;
    case FF_OPT_TYPE_DOUBLE:*(double    *)dst= num*intnum/den;         break;
    case FF_OPT_TYPE_RATIONAL:
        if((int)num == num) *(AVRational*)dst= (AVRational){num*intnum, den};
        else                *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);
    default:
        return NULL;
    }
    return o;
}

static const AVOption *set_all_opt(void *v, const char *unit, double d){
    AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
    const AVOption *o= c->option;
    const AVOption *ret=NULL;

    for(;o && o->name; o++){
        if(o->type != FF_OPT_TYPE_CONST && o->unit && !strcmp(o->unit, unit)){
            double tmp= d;
            if(o->type == FF_OPT_TYPE_FLAGS)
                tmp= av_get_int(v, o->name, NULL) | (int64_t)d;

            av_set_number(v, o->name, tmp, 1, 1);
            ret= o;
        }
    }
    return ret;
}

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

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

const AVOption *av_set_string(void *obj, const char *name, const char *val){
    const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
    if(o && o->offset==0 && o->type == FF_OPT_TYPE_CONST && o->unit){
        return set_all_opt(obj, o->unit, o->default_val);
    }
    if(!o || !val || o->offset<=0)
        return NULL;
    if(o->type != FF_OPT_TYPE_STRING){
        for(;;){
            int i;
            char buf[256];
            int cmd=0;
            double d;
            char *error = NULL;

            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;
            val+= i;

            d = ff_eval2(buf, const_values, const_names, NULL, NULL, NULL, NULL, NULL, &error);
            if(isnan(d)) {
                const AVOption *o_named= av_find_opt(obj, buf, o->unit, 0, 0);
                if(o_named && o_named->type == FF_OPT_TYPE_CONST)
                    d= o_named->default_val;
                else if(!strcmp(buf, "default")) d= o->default_val;
                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 {
                    if (!error)
                        av_log(NULL, AV_LOG_ERROR, "Unable to parse option value \"%s\": %s\n", val, error);
                    return NULL;
                }
            }
            if(o->type == FF_OPT_TYPE_FLAGS){
                if     (cmd=='+') d= av_get_int(obj, name, NULL) | (int64_t)d;
                else if(cmd=='-') d= av_get_int(obj, name, NULL) &~(int64_t)d;
            }else if(cmd=='-')
                d= -d;

            av_set_number(obj, name, d, 1, 1);
            if(!*val)
                return o;
        }
        return NULL;
    }

    memcpy(((uint8_t*)obj) + o->offset, val, sizeof(val));
    return o;
}

const AVOption *av_set_double(void *obj, const char *name, double n){
    return av_set_number(obj, name, n, 1, 1);
}

const AVOption *av_set_q(void *obj, const char *name, AVRational n){
    return av_set_number(obj, name, n.num, n.den, 1);
}

const AVOption *av_set_int(void *obj, const char *name, int64_t n){
    return av_set_number(obj, name, 1, 1, n);
}

/**
 *
 * @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_find_opt(obj, name, NULL, 0, 0);
    void *dst;
    if(!o || o->offset<=0)
        return NULL;
    if(o->type != FF_OPT_TYPE_STRING && (!buf || !buf_len))
        return NULL;

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

    if(o->type == FF_OPT_TYPE_STRING)
        return dst;

    switch(o->type){
    case FF_OPT_TYPE_FLAGS:     snprintf(buf, buf_len, "0x%08X",*(int    *)dst);break;
    case FF_OPT_TYPE_INT:       snprintf(buf, buf_len, "%d" , *(int    *)dst);break;
    case FF_OPT_TYPE_INT64:     snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
    case FF_OPT_TYPE_FLOAT:     snprintf(buf, buf_len, "%f" , *(float  *)dst);break;
    case FF_OPT_TYPE_DOUBLE:    snprintf(buf, buf_len, "%f" , *(double *)dst);break;
    case FF_OPT_TYPE_RATIONAL:  snprintf(buf, buf_len, "%d/%d", ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;
    default: return NULL;
    }
    return buf;
}

static int av_get_number(void *obj, const char *name, const AVOption **o_out, double *num, int *den, int64_t *intnum){
    const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
    void *dst;
    if(!o || o->offset<=0)
        goto error;

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

    if(o_out) *o_out= o;

    switch(o->type){
    case FF_OPT_TYPE_FLAGS:
    case FF_OPT_TYPE_INT:       *intnum= *(int    *)dst;return 0;
    case FF_OPT_TYPE_INT64:     *intnum= *(int64_t*)dst;return 0;
    case FF_OPT_TYPE_FLOAT:     *num=    *(float  *)dst;return 0;
    case FF_OPT_TYPE_DOUBLE:    *num=    *(double *)dst;return 0;
    case FF_OPT_TYPE_RATIONAL:  *intnum= ((AVRational*)dst)->num;
                                *den   = ((AVRational*)dst)->den;
                                                        return 0;
    }
error:
    *den=*intnum=0;
    return -1;
}

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

    av_get_number(obj, name, o_out, &num, &den, &intnum);
    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;

    av_get_number(obj, name, o_out, &num, &den, &intnum);
    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;

    av_get_number(obj, name, o_out, &num, &den, &intnum);
    return num*intnum/den;
}

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

    while((opt= av_next_option(obj, opt))){
        if(!(opt->flags & (AV_OPT_FLAG_ENCODING_PARAM|AV_OPT_FLAG_DECODING_PARAM)))
            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==FF_OPT_TYPE_CONST)
            continue;
        else if (unit && opt->type!=FF_OPT_TYPE_CONST)
            continue;
        else if (unit && opt->type==FF_OPT_TYPE_CONST && strcmp(unit, opt->unit))
            continue;
        else if (unit && opt->type == FF_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 FF_OPT_TYPE_FLAGS:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>" );
                break;
            case FF_OPT_TYPE_INT:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int>" );
                break;
            case FF_OPT_TYPE_INT64:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>" );
                break;
            case FF_OPT_TYPE_DOUBLE:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<double>" );
                break;
            case FF_OPT_TYPE_FLOAT:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<float>" );
                break;
            case FF_OPT_TYPE_STRING:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<string>" );
                break;
            case FF_OPT_TYPE_RATIONAL:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>" );
                break;
            case FF_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_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 != FF_OPT_TYPE_CONST) {
            opt_list(obj, av_log_obj, opt->unit);
        }
    }
}

int av_opt_show(void *obj, void *av_log_obj){
    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);

    return 0;
}

/** Set the values of the AVCodecContext or AVFormatContext structure.
 * They are set to the defaults specified in the according AVOption options
 * array default_val field.
 *
 * @param s AVCodecContext or AVFormatContext for which the defaults will be set
 */
void av_opt_set_defaults2(void *s, int mask, int flags)
{
    const AVOption *opt = NULL;
    while ((opt = av_next_option(s, opt)) != NULL) {
        if((opt->flags & mask) != flags)
            continue;
        switch(opt->type) {
            case FF_OPT_TYPE_CONST:
                /* Nothing to be done here */
            break;
            case FF_OPT_TYPE_FLAGS:
            case FF_OPT_TYPE_INT: {
                int val;
                val = opt->default_val;
                av_set_int(s, opt->name, val);
            }
            break;
            case FF_OPT_TYPE_FLOAT: {
                double val;
                val = opt->default_val;
                av_set_double(s, opt->name, val);
            }
            break;
            case FF_OPT_TYPE_RATIONAL: {
                AVRational val;
                val = av_d2q(opt->default_val, INT_MAX);
                av_set_q(s, opt->name, val);
            }
            break;
            case FF_OPT_TYPE_STRING:
                /* Cannot set default for string as default_val is of type * double */
            break;
            default:
                av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n", opt->type, opt->name);
        }
    }
}

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