malloc padding to avoid reading past the malloc()ed area.
[libav.git] / libavcodec / opt.c
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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"
6fd46414 28#include "opt.h"
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29
30static 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
637b5326 39static AVOption *find_opt(void *v, const char *name, const char *unit){
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40 AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
41 AVOption *o= c->option;
42
43 for(;o && o->name; o++){
637b5326 44 if(!strcmp(o->name, name) && (!unit || !strcmp(o->unit, unit)) )
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45 return o;
46 }
47 return NULL;
48}
49
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50AVOption *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
8bbf6db9 56static AVOption *av_set_number(void *obj, const char *name, double num, int den, int64_t intnum){
637b5326 57 AVOption *o= find_opt(obj, name, NULL);
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58 void *dst;
59 if(!o || o->offset<=0)
8bbf6db9 60 return NULL;
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61
62 if(o->max*den < num*intnum || o->min*den > num*intnum)
8bbf6db9 63 return NULL;
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64
65 dst= ((uint8_t*)obj) + o->offset;
66
67 switch(o->type){
233f6f88 68 case FF_OPT_TYPE_FLAGS:
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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;
860a40c8 73 case FF_OPT_TYPE_RATIONAL:
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74 if((int)num == num) *(AVRational*)dst= (AVRational){num*intnum, den};
75 else *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);
860a40c8 76 default:
8bbf6db9 77 return NULL;
860a40c8 78 }
8bbf6db9 79 return o;
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80}
81
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82static 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
860a40c8 100//FIXME use eval.c maybe?
8bbf6db9 101AVOption *av_set_string(void *obj, const char *name, const char *val){
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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 }
860a40c8 106 if(!o || !val || o->offset<=0)
8bbf6db9 107 return NULL;
860a40c8 108 if(o->type != FF_OPT_TYPE_STRING){
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109 for(;;){
110 int i;
111 char buf[256], *tail;
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112 int cmd=0;
113 double d;
860a40c8 114
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115 if(*val == '+' || *val == '-')
116 cmd= *(val++);
117
118 for(i=0; i<sizeof(buf)-1 && val[i] && val[i]!='+' && val[i]!='-'; i++)
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119 buf[i]= val[i];
120 buf[i]=0;
121 val+= i;
122
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123 d= av_parse_num(buf, &tail);
124 if(tail <= buf){
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125 AVOption *o_named= find_opt(obj, buf, o->unit);
126 if(o_named && o_named->type == FF_OPT_TYPE_CONST)
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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;
8bbf6db9 131 else return NULL;
860a40c8 132 }
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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;
860a40c8 138
233f6f88 139 av_set_number(obj, name, d, 1, 1);
860a40c8 140 if(!*val)
233f6f88 141 return o;
860a40c8 142 }
8bbf6db9 143 return NULL;
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144 }
145
146 memcpy(((uint8_t*)obj) + o->offset, val, sizeof(val));
8bbf6db9 147 return o;
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148}
149
8bbf6db9 150AVOption *av_set_double(void *obj, const char *name, double n){
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151 return av_set_number(obj, name, n, 1, 1);
152}
153
8bbf6db9 154AVOption *av_set_q(void *obj, const char *name, AVRational n){
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155 return av_set_number(obj, name, n.num, n.den, 1);
156}
157
8bbf6db9 158AVOption *av_set_int(void *obj, const char *name, int64_t n){
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159 return av_set_number(obj, name, 1, 1, n);
160}
161
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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 */
167const char *av_get_string(void *obj, const char *name, AVOption **o_out, char *buf, int buf_len){
637b5326 168 AVOption *o= find_opt(obj, name, NULL);
8bbf6db9 169 void *dst;
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170 if(!o || o->offset<=0)
171 return NULL;
8bbf6db9 172 if(o->type != FF_OPT_TYPE_STRING && (!buf || !buf_len))
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173 return NULL;
174
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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){
233f6f88 182 case FF_OPT_TYPE_FLAGS: snprintf(buf, buf_len, "0x%08X",*(int *)dst);break;
8bbf6db9 183 case FF_OPT_TYPE_INT: snprintf(buf, buf_len, "%d" , *(int *)dst);break;
4733abcb 184 case FF_OPT_TYPE_INT64: snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
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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;
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191}
192
8bbf6db9 193static int av_get_number(void *obj, const char *name, AVOption **o_out, double *num, int *den, int64_t *intnum){
637b5326 194 AVOption *o= find_opt(obj, name, NULL);
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195 void *dst;
196 if(!o || o->offset<=0)
8bbf6db9 197 goto error;
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198
199 dst= ((uint8_t*)obj) + o->offset;
200
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201 if(o_out) *o_out= o;
202
860a40c8 203 switch(o->type){
233f6f88 204 case FF_OPT_TYPE_FLAGS:
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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;
860a40c8 212 }
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213error:
214 *den=*intnum=0;
215 return -1;
216}
217
218double 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
227AVRational 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
239int64_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
a1689e2f 248int av_opt_show(void *obj, void *av_log_obj){
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249 AVOption *opt=NULL;
250
251 if(!obj)
252 return -1;
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253
254 av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);
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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
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260 av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);
261 av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
262 av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
263 av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM ) ? 'V' : '.');
264 av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM ) ? 'A' : '.');
265 av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');
8bbf6db9 266
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267 if(opt->help)
268 av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
269 av_log(av_log_obj, AV_LOG_INFO, "\n");
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270 }
271 return 0;
860a40c8 272}