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88d6903e23
Patch by Antoine Cellerier < dionoea AaH via pOiS ecp PoIs fr > Original thread: Date: Nov 1, 2005 7:41 PM Subject: [Ffmpeg-devel] libavcodec help Originally committed as revision 5054 to svn://svn.ffmpeg.org/ffmpeg/trunk
302 lines
9.9 KiB
C
302 lines
9.9 KiB
C
/*
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* AVOptions
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* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/**
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* @file opt.c
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* AVOptions
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#include "avcodec.h"
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#include "opt.h"
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static double av_parse_num(const char *name, char **tail){
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double d;
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d= strtod(name, tail);
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if(*tail>name && (**tail=='/' || **tail==':'))
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d/=strtod((*tail)+1, tail);
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return d;
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}
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//FIXME order them and do a bin search
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static AVOption *find_opt(void *v, const char *name, const char *unit){
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AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
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AVOption *o= c->option;
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for(;o && o->name; o++){
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if(!strcmp(o->name, name) && (!unit || !strcmp(o->unit, unit)) )
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return o;
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}
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return NULL;
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}
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AVOption *av_next_option(void *obj, AVOption *last){
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if(last && last[1].name) return ++last;
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else if(last) return NULL;
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else return (*(AVClass**)obj)->option;
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}
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static AVOption *av_set_number(void *obj, const char *name, double num, int den, int64_t intnum){
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AVOption *o= find_opt(obj, name, NULL);
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void *dst;
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if(!o || o->offset<=0)
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return NULL;
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if(o->max*den < num*intnum || o->min*den > num*intnum)
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return NULL;
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dst= ((uint8_t*)obj) + o->offset;
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switch(o->type){
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case FF_OPT_TYPE_FLAGS:
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case FF_OPT_TYPE_INT: *(int *)dst= lrintf(num/den)*intnum; break;
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case FF_OPT_TYPE_INT64: *(int64_t *)dst= lrintf(num/den)*intnum; break;
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case FF_OPT_TYPE_FLOAT: *(float *)dst= num*intnum/den; break;
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case FF_OPT_TYPE_DOUBLE:*(double *)dst= num*intnum/den; break;
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case FF_OPT_TYPE_RATIONAL:
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if((int)num == num) *(AVRational*)dst= (AVRational){num*intnum, den};
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else *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);
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default:
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return NULL;
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}
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return o;
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}
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static AVOption *set_all_opt(void *v, const char *unit, double d){
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AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
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AVOption *o= c->option;
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AVOption *ret=NULL;
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for(;o && o->name; o++){
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if(o->type != FF_OPT_TYPE_CONST && o->unit && !strcmp(o->unit, unit)){
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double tmp= d;
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if(o->type == FF_OPT_TYPE_FLAGS)
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tmp= av_get_int(v, o->name, NULL) | (int64_t)d;
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av_set_number(v, o->name, tmp, 1, 1);
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ret= o;
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}
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}
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return ret;
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}
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//FIXME use eval.c maybe?
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AVOption *av_set_string(void *obj, const char *name, const char *val){
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AVOption *o= find_opt(obj, name, NULL);
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if(o && o->offset==0 && o->type == FF_OPT_TYPE_CONST && o->unit){
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return set_all_opt(obj, o->unit, o->default_val);
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}
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if(!o || !val || o->offset<=0)
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return NULL;
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if(o->type != FF_OPT_TYPE_STRING){
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for(;;){
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int i;
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char buf[256], *tail;
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int cmd=0;
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double d;
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if(*val == '+' || *val == '-')
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cmd= *(val++);
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for(i=0; i<sizeof(buf)-1 && val[i] && val[i]!='+' && val[i]!='-'; i++)
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buf[i]= val[i];
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buf[i]=0;
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val+= i;
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d= av_parse_num(buf, &tail);
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if(tail <= buf){
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AVOption *o_named= find_opt(obj, buf, o->unit);
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if(o_named && o_named->type == FF_OPT_TYPE_CONST)
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d= o_named->default_val;
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else if(!strcmp(buf, "default")) d= o->default_val;
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else if(!strcmp(buf, "max" )) d= o->max;
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else if(!strcmp(buf, "min" )) d= o->min;
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else return NULL;
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}
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if(o->type == FF_OPT_TYPE_FLAGS){
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if (cmd=='+') d= av_get_int(obj, name, NULL) | (int64_t)d;
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else if(cmd=='-') d= av_get_int(obj, name, NULL) &~(int64_t)d;
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}else if(cmd=='-')
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d= -d;
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av_set_number(obj, name, d, 1, 1);
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if(!*val)
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return o;
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}
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return NULL;
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}
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memcpy(((uint8_t*)obj) + o->offset, val, sizeof(val));
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return o;
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}
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AVOption *av_set_double(void *obj, const char *name, double n){
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return av_set_number(obj, name, n, 1, 1);
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}
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AVOption *av_set_q(void *obj, const char *name, AVRational n){
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return av_set_number(obj, name, n.num, n.den, 1);
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}
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AVOption *av_set_int(void *obj, const char *name, int64_t n){
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return av_set_number(obj, name, 1, 1, n);
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}
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/**
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*
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* @param buf a buffer which is used for returning non string values as strings, can be NULL
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* @param buf_len allocated length in bytes of buf
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*/
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const char *av_get_string(void *obj, const char *name, AVOption **o_out, char *buf, int buf_len){
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AVOption *o= find_opt(obj, name, NULL);
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void *dst;
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if(!o || o->offset<=0)
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return NULL;
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if(o->type != FF_OPT_TYPE_STRING && (!buf || !buf_len))
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return NULL;
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dst= ((uint8_t*)obj) + o->offset;
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if(o_out) *o_out= o;
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if(o->type == FF_OPT_TYPE_STRING)
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return dst;
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switch(o->type){
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case FF_OPT_TYPE_FLAGS: snprintf(buf, buf_len, "0x%08X",*(int *)dst);break;
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case FF_OPT_TYPE_INT: snprintf(buf, buf_len, "%d" , *(int *)dst);break;
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case FF_OPT_TYPE_INT64: snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
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case FF_OPT_TYPE_FLOAT: snprintf(buf, buf_len, "%f" , *(float *)dst);break;
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case FF_OPT_TYPE_DOUBLE: snprintf(buf, buf_len, "%f" , *(double *)dst);break;
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case FF_OPT_TYPE_RATIONAL: snprintf(buf, buf_len, "%d/%d", ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;
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default: return NULL;
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}
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return buf;
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}
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static int av_get_number(void *obj, const char *name, AVOption **o_out, double *num, int *den, int64_t *intnum){
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AVOption *o= find_opt(obj, name, NULL);
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void *dst;
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if(!o || o->offset<=0)
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goto error;
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dst= ((uint8_t*)obj) + o->offset;
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if(o_out) *o_out= o;
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switch(o->type){
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case FF_OPT_TYPE_FLAGS:
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case FF_OPT_TYPE_INT: *intnum= *(int *)dst;return 0;
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case FF_OPT_TYPE_INT64: *intnum= *(int64_t*)dst;return 0;
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case FF_OPT_TYPE_FLOAT: *num= *(float *)dst;return 0;
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case FF_OPT_TYPE_DOUBLE: *num= *(double *)dst;return 0;
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case FF_OPT_TYPE_RATIONAL: *intnum= ((AVRational*)dst)->num;
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*den = ((AVRational*)dst)->den;
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return 0;
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}
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error:
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*den=*intnum=0;
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return -1;
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}
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double av_get_double(void *obj, const char *name, AVOption **o_out){
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int64_t intnum=1;
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double num=1;
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int den=1;
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av_get_number(obj, name, o_out, &num, &den, &intnum);
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return num*intnum/den;
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}
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AVRational av_get_q(void *obj, const char *name, AVOption **o_out){
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int64_t intnum=1;
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double num=1;
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int den=1;
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av_get_number(obj, name, o_out, &num, &den, &intnum);
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if(num == 1.0 && (int)intnum == intnum)
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return (AVRational){intnum, den};
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else
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return av_d2q(num*intnum/den, 1<<24);
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}
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int64_t av_get_int(void *obj, const char *name, AVOption **o_out){
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int64_t intnum=1;
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double num=1;
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int den=1;
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av_get_number(obj, name, o_out, &num, &den, &intnum);
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return num*intnum/den;
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}
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int av_opt_show(void *obj, void *av_log_obj){
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AVOption *opt=NULL;
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if(!obj)
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return -1;
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av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);
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while((opt= av_next_option(obj, opt))){
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if(!(opt->flags & (AV_OPT_FLAG_ENCODING_PARAM|AV_OPT_FLAG_DECODING_PARAM)))
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continue;
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av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);
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switch( opt->type )
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{
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case FF_OPT_TYPE_FLAGS:
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av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>" );
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break;
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case FF_OPT_TYPE_INT:
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av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int>" );
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break;
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case FF_OPT_TYPE_INT64:
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av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>" );
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break;
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case FF_OPT_TYPE_DOUBLE:
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av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<double>" );
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break;
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case FF_OPT_TYPE_FLOAT:
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av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<float>" );
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break;
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case FF_OPT_TYPE_STRING:
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av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<string>" );
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break;
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case FF_OPT_TYPE_RATIONAL:
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av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>" );
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break;
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case FF_OPT_TYPE_CONST:
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default:
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av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "" );
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break;
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}
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av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
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av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
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av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM ) ? 'V' : '.');
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av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM ) ? 'A' : '.');
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av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');
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if(opt->help)
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av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
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av_log(av_log_obj, AV_LOG_INFO, "\n");
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}
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return 0;
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}
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