AVOption first try
[libav.git] / libavcodec / opt.c
CommitLineData
860a40c8
MN
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
29static double av_parse_num(const char *name, char **tail){
30 double d;
31 d= strtod(name, tail);
32 if(*tail>name && (**tail=='/' || **tail==':'))
33 d/=strtod((*tail)+1, tail);
34 return d;
35}
36
37//FIXME order them and do a bin search
38static AVOption *find_opt(void *v, const char *name){
39 AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
40 AVOption *o= c->option;
41
42 for(;o && o->name; o++){
43 if(!strcmp(o->name, name))
44 return o;
45 }
46 return NULL;
47}
48
49static int av_set_number(void *obj, const char *name, double num, int den, int64_t intnum){
50 AVOption *o= find_opt(obj, name);
51 void *dst;
52 if(!o || o->offset<=0)
53 return -1;
54
55 if(o->max*den < num*intnum || o->min*den > num*intnum)
56 return -1;
57
58 dst= ((uint8_t*)obj) + o->offset;
59
60 switch(o->type){
61 case FF_OPT_TYPE_INT:
62 *(int*)dst= lrintf(num/den)*intnum;
63 break;
64 case FF_OPT_TYPE_INT64:
65 *(int64_t*)dst= lrintf(num/den)*intnum;
66 break;
67 case FF_OPT_TYPE_FLOAT:
68 *(float*)dst= num*intnum/den;
69 break;
70 case FF_OPT_TYPE_DOUBLE:
71 *(double*)dst= num*intnum/den;
72 break;
73 case FF_OPT_TYPE_RATIONAL:
74 if((int)num == num)
75 *(AVRational*)dst= (AVRational){num*intnum, den};
76 else
77 *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);
78 default:
79 return -1;
80 }
81 return 0;
82}
83
84//FIXME use eval.c maybe?
85int av_set_string(void *obj, const char *name, const char *val){
86 AVOption *o= find_opt(obj, name);
87 if(!o || !val || o->offset<=0)
88 return -1;
89 if(o->type != FF_OPT_TYPE_STRING){
90 double d=0, tmp_d;
91 for(;;){
92 int i;
93 char buf[256], *tail;
94
95 for(i=0; i<sizeof(buf)-1 && val[i] && val[i]!='+'; i++)
96 buf[i]= val[i];
97 buf[i]=0;
98 val+= i;
99
100 tmp_d= av_parse_num(buf, &tail);
101 if(tail > buf)
102 d+= tmp_d;
103 else{
104 AVOption *o_named= find_opt(obj, buf);
105 if(o_named && o_named->type == FF_OPT_TYPE_CONST)
106 d+= o_named->default_val;
107 else if(!strcmp(buf, "default")) d+= o->default_val;
108 else if(!strcmp(buf, "max" )) d+= o->max;
109 else if(!strcmp(buf, "min" )) d+= o->min;
110 else return -1;
111 }
112
113 if(*val == '+') val++;
114 if(!*val)
115 return av_set_number(obj, name, d, 1, 1);
116 }
117 return -1;
118 }
119
120 memcpy(((uint8_t*)obj) + o->offset, val, sizeof(val));
121 return 0;
122}
123
124int av_set_double(void *obj, const char *name, double n){
125 return av_set_number(obj, name, n, 1, 1);
126}
127
128int av_set_q(void *obj, const char *name, AVRational n){
129 return av_set_number(obj, name, n.num, n.den, 1);
130}
131
132int av_set_int(void *obj, const char *name, int64_t n){
133 return av_set_number(obj, name, 1, 1, n);
134}
135
136const char *av_get_string(void *obj, const char *name){
137 AVOption *o= find_opt(obj, name);
138 if(!o || o->offset<=0)
139 return NULL;
140 if(o->type != FF_OPT_TYPE_STRING) //FIXME convert to string? but what about free()?
141 return NULL;
142
143 return (const char*)(((uint8_t*)obj) + o->offset);
144}
145
146double av_get_double(void *obj, const char *name){
147 AVOption *o= find_opt(obj, name);
148 void *dst;
149 if(!o || o->offset<=0)
150 return NAN;
151
152 dst= ((uint8_t*)obj) + o->offset;
153
154 switch(o->type){
155 case FF_OPT_TYPE_INT: return *(int*)dst;
156 case FF_OPT_TYPE_INT64: return *(int64_t*)dst; //FIXME maybe write a av_get_int64() ?
157 case FF_OPT_TYPE_FLOAT: return *(float*)dst;
158 case FF_OPT_TYPE_DOUBLE: return *(double*)dst;
159 case FF_OPT_TYPE_RATIONAL: return av_q2d(*(AVRational*)dst); //FIXME maybe write a av_get_q() ?
160 default: return NAN;
161 }
162}