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ffmpeg/libavcodec/opt.c

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/*
* AVOptions
* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; 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"
/**
* strtod() function extended with 'k', 'M' and 'B' postfixes.
* This allows using kB, MB, k, M and B as a postfix. This function
* assumes that the unit of numbers is bits not bytes.
*/
static double av_strtod(const char *name, char **tail) {
double d;
d= strtod(name, tail);
if(*tail>name && (**tail=='k')) {
d*=1000;
(*tail)++;
}
else if(*tail && (**tail=='M')) {
d*=1000000;
(*tail)++;
}
else if(*tail && (**tail=='G')) {
d*=1000000000;
(*tail)++;
}
if(*tail && (**tail=='B')) {
d*=8;
(*tail)++;
}
return d;
}
static double av_parse_num(const char *name, char **tail){
double d;
d= av_strtod(name, tail);
if(*tail>name && (**tail=='/' || **tail==':'))
d/=av_strtod((*tail)+1, tail);
return d;
}
//FIXME order them and do a bin search
static AVOption *find_opt(void *v, const char *name, const char *unit){
AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
AVOption *o= c->option;
for(;o && o->name; o++){
if(!strcmp(o->name, name) && (!unit || !strcmp(o->unit, unit)) )
return o;
}
return NULL;
}
AVOption *av_next_option(void *obj, AVOption *last){
if(last && last[1].name) return ++last;
else if(last) return NULL;
else return (*(AVClass**)obj)->option;
}
static AVOption *av_set_number(void *obj, const char *name, double num, int den, int64_t intnum){
AVOption *o= find_opt(obj, name, NULL);
void *dst;
if(!o || o->offset<=0)
return NULL;
if(o->max*den < num*intnum || o->min*den > num*intnum)
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 AVOption *set_all_opt(void *v, const char *unit, double d){
AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
AVOption *o= c->option;
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;
}
//FIXME use eval.c maybe?
AVOption *av_set_string(void *obj, const char *name, const char *val){
AVOption *o= find_opt(obj, name, NULL);
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], *tail;
int cmd=0;
double d;
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= av_parse_num(buf, &tail);
if(tail <= buf){
AVOption *o_named= find_opt(obj, buf, o->unit);
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 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;
}
AVOption *av_set_double(void *obj, const char *name, double n){
return av_set_number(obj, name, n, 1, 1);
}
AVOption *av_set_q(void *obj, const char *name, AVRational n){
return av_set_number(obj, name, n.num, n.den, 1);
}
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, AVOption **o_out, char *buf, int buf_len){
AVOption *o= find_opt(obj, name, NULL);
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, AVOption **o_out, double *num, int *den, int64_t *intnum){
AVOption *o= find_opt(obj, name, NULL);
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, 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, 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, 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;
}
int av_opt_show(void *obj, void *av_log_obj){
AVOption *opt=NULL;
if(!obj)
return -1;
av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);
while((opt= av_next_option(obj, opt))){
if(!(opt->flags & (AV_OPT_FLAG_ENCODING_PARAM|AV_OPT_FLAG_DECODING_PARAM)))
continue;
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");
}
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_defaults(void *s)
{
AVOption *opt = NULL;
while ((opt = av_next_option(s, opt)) != NULL) {
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);
}
}
}
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