Statistics
| Branch: | Revision:

ffmpeg / libavcodec / opt.c @ 493f7857

History | View | Annotate | Download (11.3 KB)

1
/*
2
 * AVOptions
3
 * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
 *
19
 */
20

    
21
/**
22
 * @file opt.c
23
 * AVOptions
24
 * @author Michael Niedermayer <michaelni@gmx.at>
25
 */
26

    
27
#include "avcodec.h"
28
#include "opt.h"
29

    
30
static double av_parse_num(const char *name, char **tail){
31
    double d;
32
    d= strtod(name, tail);
33
    if(*tail>name && (**tail=='/' || **tail==':'))
34
        d/=strtod((*tail)+1, tail);
35
    return d;
36
}
37

    
38
//FIXME order them and do a bin search
39
static AVOption *find_opt(void *v, const char *name, const char *unit){
40
    AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
41
    AVOption *o= c->option;
42

    
43
    for(;o && o->name; o++){
44
        if(!strcmp(o->name, name) && (!unit || !strcmp(o->unit, unit)) )
45
            return o;
46
    }
47
    return NULL;
48
}
49

    
50
AVOption *av_next_option(void *obj, AVOption *last){
51
    if(last && last[1].name) return ++last;
52
    else if(last)            return NULL;
53
    else                     return (*(AVClass**)obj)->option;
54
}
55

    
56
static AVOption *av_set_number(void *obj, const char *name, double num, int den, int64_t intnum){
57
    AVOption *o= find_opt(obj, name, NULL);
58
    void *dst;
59
    if(!o || o->offset<=0)
60
        return NULL;
61

    
62
    if(o->max*den < num*intnum || o->min*den > num*intnum)
63
        return NULL;
64

    
65
    dst= ((uint8_t*)obj) + o->offset;
66

    
67
    switch(o->type){
68
    case FF_OPT_TYPE_FLAGS:
69
    case FF_OPT_TYPE_INT:   *(int       *)dst= lrintf(num/den)*intnum; break;
70
    case FF_OPT_TYPE_INT64: *(int64_t   *)dst= lrintf(num/den)*intnum; break;
71
    case FF_OPT_TYPE_FLOAT: *(float     *)dst= num*intnum/den;         break;
72
    case FF_OPT_TYPE_DOUBLE:*(double    *)dst= num*intnum/den;         break;
73
    case FF_OPT_TYPE_RATIONAL:
74
        if((int)num == num) *(AVRational*)dst= (AVRational){num*intnum, den};
75
        else                *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);
76
    default:
77
        return NULL;
78
    }
79
    return o;
80
}
81

    
82
static AVOption *set_all_opt(void *v, const char *unit, double d){
83
    AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
84
    AVOption *o= c->option;
85
    AVOption *ret=NULL;
86

    
87
    for(;o && o->name; o++){
88
        if(o->type != FF_OPT_TYPE_CONST && o->unit && !strcmp(o->unit, unit)){
89
            double tmp= d;
90
            if(o->type == FF_OPT_TYPE_FLAGS)
91
                tmp= av_get_int(v, o->name, NULL) | (int64_t)d;
92

    
93
            av_set_number(v, o->name, tmp, 1, 1);
94
            ret= o;
95
        }
96
    }
97
    return ret;
98
}
99

    
100
//FIXME use eval.c maybe?
101
AVOption *av_set_string(void *obj, const char *name, const char *val){
102
    AVOption *o= find_opt(obj, name, NULL);
103
    if(o && o->offset==0 && o->type == FF_OPT_TYPE_CONST && o->unit){
104
        return set_all_opt(obj, o->unit, o->default_val);
105
    }
106
    if(!o || !val || o->offset<=0)
107
        return NULL;
108
    if(o->type != FF_OPT_TYPE_STRING){
109
        for(;;){
110
            int i;
111
            char buf[256], *tail;
112
            int cmd=0;
113
            double d;
114

    
115
            if(*val == '+' || *val == '-')
116
                cmd= *(val++);
117

    
118
            for(i=0; i<sizeof(buf)-1 && val[i] && val[i]!='+' && val[i]!='-'; i++)
119
                buf[i]= val[i];
120
            buf[i]=0;
121
            val+= i;
122

    
123
            d= av_parse_num(buf, &tail);
124
            if(tail <= buf){
125
                AVOption *o_named= find_opt(obj, buf, o->unit);
126
                if(o_named && o_named->type == FF_OPT_TYPE_CONST)
127
                    d= o_named->default_val;
128
                else if(!strcmp(buf, "default")) d= o->default_val;
129
                else if(!strcmp(buf, "max"    )) d= o->max;
130
                else if(!strcmp(buf, "min"    )) d= o->min;
131
                else return NULL;
132
            }
133
            if(o->type == FF_OPT_TYPE_FLAGS){
134
                if     (cmd=='+') d= av_get_int(obj, name, NULL) | (int64_t)d;
135
                else if(cmd=='-') d= av_get_int(obj, name, NULL) &~(int64_t)d;
136
            }else if(cmd=='-')
137
                d= -d;
138

    
139
            av_set_number(obj, name, d, 1, 1);
140
            if(!*val)
141
                return o;
142
        }
143
        return NULL;
144
    }
145

    
146
    memcpy(((uint8_t*)obj) + o->offset, val, sizeof(val));
147
    return o;
148
}
149

    
150
AVOption *av_set_double(void *obj, const char *name, double n){
151
    return av_set_number(obj, name, n, 1, 1);
152
}
153

    
154
AVOption *av_set_q(void *obj, const char *name, AVRational n){
155
    return av_set_number(obj, name, n.num, n.den, 1);
156
}
157

    
158
AVOption *av_set_int(void *obj, const char *name, int64_t n){
159
    return av_set_number(obj, name, 1, 1, n);
160
}
161

    
162
/**
163
 *
164
 * @param buf a buffer which is used for returning non string values as strings, can be NULL
165
 * @param buf_len allocated length in bytes of buf
166
 */
167
const char *av_get_string(void *obj, const char *name, AVOption **o_out, char *buf, int buf_len){
168
    AVOption *o= find_opt(obj, name, NULL);
169
    void *dst;
170
    if(!o || o->offset<=0)
171
        return NULL;
172
    if(o->type != FF_OPT_TYPE_STRING && (!buf || !buf_len))
173
        return NULL;
174

    
175
    dst= ((uint8_t*)obj) + o->offset;
176
    if(o_out) *o_out= o;
177

    
178
    if(o->type == FF_OPT_TYPE_STRING)
179
        return dst;
180

    
181
    switch(o->type){
182
    case FF_OPT_TYPE_FLAGS:     snprintf(buf, buf_len, "0x%08X",*(int    *)dst);break;
183
    case FF_OPT_TYPE_INT:       snprintf(buf, buf_len, "%d" , *(int    *)dst);break;
184
    case FF_OPT_TYPE_INT64:     snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
185
    case FF_OPT_TYPE_FLOAT:     snprintf(buf, buf_len, "%f" , *(float  *)dst);break;
186
    case FF_OPT_TYPE_DOUBLE:    snprintf(buf, buf_len, "%f" , *(double *)dst);break;
187
    case FF_OPT_TYPE_RATIONAL:  snprintf(buf, buf_len, "%d/%d", ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;
188
    default: return NULL;
189
    }
190
    return buf;
191
}
192

    
193
static int av_get_number(void *obj, const char *name, AVOption **o_out, double *num, int *den, int64_t *intnum){
194
    AVOption *o= find_opt(obj, name, NULL);
195
    void *dst;
196
    if(!o || o->offset<=0)
197
        goto error;
198

    
199
    dst= ((uint8_t*)obj) + o->offset;
200

    
201
    if(o_out) *o_out= o;
202

    
203
    switch(o->type){
204
    case FF_OPT_TYPE_FLAGS:
205
    case FF_OPT_TYPE_INT:       *intnum= *(int    *)dst;return 0;
206
    case FF_OPT_TYPE_INT64:     *intnum= *(int64_t*)dst;return 0;
207
    case FF_OPT_TYPE_FLOAT:     *num=    *(float  *)dst;return 0;
208
    case FF_OPT_TYPE_DOUBLE:    *num=    *(double *)dst;return 0;
209
    case FF_OPT_TYPE_RATIONAL:  *intnum= ((AVRational*)dst)->num;
210
                                *den   = ((AVRational*)dst)->den;
211
                                                        return 0;
212
    }
213
error:
214
    *den=*intnum=0;
215
    return -1;
216
}
217

    
218
double av_get_double(void *obj, const char *name, AVOption **o_out){
219
    int64_t intnum=1;
220
    double num=1;
221
    int den=1;
222

    
223
    av_get_number(obj, name, o_out, &num, &den, &intnum);
224
    return num*intnum/den;
225
}
226

    
227
AVRational av_get_q(void *obj, const char *name, AVOption **o_out){
228
    int64_t intnum=1;
229
    double num=1;
230
    int den=1;
231

    
232
    av_get_number(obj, name, o_out, &num, &den, &intnum);
233
    if(num == 1.0 && (int)intnum == intnum)
234
        return (AVRational){intnum, den};
235
    else
236
        return av_d2q(num*intnum/den, 1<<24);
237
}
238

    
239
int64_t av_get_int(void *obj, const char *name, AVOption **o_out){
240
    int64_t intnum=1;
241
    double num=1;
242
    int den=1;
243

    
244
    av_get_number(obj, name, o_out, &num, &den, &intnum);
245
    return num*intnum/den;
246
}
247

    
248
int av_opt_show(void *obj, void *av_log_obj){
249
    AVOption *opt=NULL;
250

    
251
    if(!obj)
252
        return -1;
253

    
254
    av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);
255

    
256
    while((opt= av_next_option(obj, opt))){
257
        if(!(opt->flags & (AV_OPT_FLAG_ENCODING_PARAM|AV_OPT_FLAG_DECODING_PARAM)))
258
            continue;
259

    
260
        av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);
261

    
262
        switch( opt->type )
263
        {
264
            case FF_OPT_TYPE_FLAGS:
265
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>" );
266
                break;
267
            case FF_OPT_TYPE_INT:
268
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int>" );
269
                break;
270
            case FF_OPT_TYPE_INT64:
271
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>" );
272
                break;
273
            case FF_OPT_TYPE_DOUBLE:
274
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<double>" );
275
                break;
276
            case FF_OPT_TYPE_FLOAT:
277
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<float>" );
278
                break;
279
            case FF_OPT_TYPE_STRING:
280
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<string>" );
281
                break;
282
            case FF_OPT_TYPE_RATIONAL:
283
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>" );
284
                break;
285
            case FF_OPT_TYPE_CONST:
286
            default:
287
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "" );
288
                break;
289
        }
290
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
291
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
292
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM   ) ? 'V' : '.');
293
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM   ) ? 'A' : '.');
294
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');
295

    
296
        if(opt->help)
297
            av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
298
        av_log(av_log_obj, AV_LOG_INFO, "\n");
299
    }
300
    return 0;
301
}
302

    
303
/** Set the values of the AVCodecContext or AVFormatContext structure.
304
 * They are set to the defaults specified in the according AVOption options
305
 * array default_val field.
306
 *
307
 * @param s AVCodecContext or AVFormatContext for which the defaults will be set
308
 */
309
void av_opt_set_defaults(void *s)
310
{
311
    AVOption *opt = NULL;
312
    while ((opt = av_next_option(s, opt)) != NULL) {
313
        switch(opt->type) {
314
            case FF_OPT_TYPE_CONST:
315
                /* Nothing to be done here */
316
            break;
317
            case FF_OPT_TYPE_FLAGS:
318
            case FF_OPT_TYPE_INT: {
319
                int val;
320
                val = opt->default_val;
321
                av_set_int(s, opt->name, val);
322
            }
323
            break;
324
            case FF_OPT_TYPE_FLOAT: {
325
                double val;
326
                val = opt->default_val;
327
                av_set_double(s, opt->name, val);
328
            }
329
            break;
330
            case FF_OPT_TYPE_RATIONAL: {
331
                AVRational val;
332
                val = av_d2q(opt->default_val, INT_MAX);
333
                av_set_q(s, opt->name, val);
334
            }
335
            break;
336
            case FF_OPT_TYPE_STRING:
337
                /* Cannot set default for string as default_val is of type * double */
338
            break;
339
            default:
340
                av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n", opt->type, opt->name);
341
        }
342
    }
343
}
344