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ffmpeg / libavcodec / opt.c @ 88d6903e

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1 860a40c8 Michael Niedermayer
/*
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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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 */
20 115329f1 Diego Biurrun
21 860a40c8 Michael Niedermayer
/**
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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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 */
26 115329f1 Diego Biurrun
27 860a40c8 Michael Niedermayer
#include "avcodec.h"
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#include "opt.h"
29 115329f1 Diego Biurrun
30 860a40c8 Michael Niedermayer
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;
42 115329f1 Diego Biurrun
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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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50 3735e82f Michael Niedermayer
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){
68 115329f1 Diego Biurrun
    case FF_OPT_TYPE_FLAGS:
69 8bbf6db9 Michael Niedermayer
    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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100 860a40c8 Michael Niedermayer
//FIXME use eval.c maybe?
101 8bbf6db9 Michael Niedermayer
AVOption *av_set_string(void *obj, const char *name, const char *val){
102 637b5326 Michael Niedermayer
    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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    }
106 115329f1 Diego Biurrun
    if(!o || !val || o->offset<=0)
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        return NULL;
108 860a40c8 Michael Niedermayer
    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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118 233f6f88 Michael Niedermayer
            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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            }
133 233f6f88 Michael Niedermayer
            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;
138 860a40c8 Michael Niedermayer
139 233f6f88 Michael Niedermayer
            av_set_number(obj, name, d, 1, 1);
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            if(!*val)
141 233f6f88 Michael Niedermayer
                return o;
142 860a40c8 Michael Niedermayer
        }
143 8bbf6db9 Michael Niedermayer
        return NULL;
144 860a40c8 Michael Niedermayer
    }
145 115329f1 Diego Biurrun
146 860a40c8 Michael Niedermayer
    memcpy(((uint8_t*)obj) + o->offset, val, sizeof(val));
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    return o;
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}
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150 8bbf6db9 Michael Niedermayer
AVOption *av_set_double(void *obj, const char *name, double n){
151 860a40c8 Michael Niedermayer
    return av_set_number(obj, name, n, 1, 1);
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}
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154 8bbf6db9 Michael Niedermayer
AVOption *av_set_q(void *obj, const char *name, AVRational n){
155 860a40c8 Michael Niedermayer
    return av_set_number(obj, name, n.num, n.den, 1);
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}
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158 8bbf6db9 Michael Niedermayer
AVOption *av_set_int(void *obj, const char *name, int64_t n){
159 860a40c8 Michael Niedermayer
    return av_set_number(obj, name, 1, 1, n);
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}
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162 8bbf6db9 Michael Niedermayer
/**
163 115329f1 Diego Biurrun
 *
164 8bbf6db9 Michael Niedermayer
 * @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;
177 115329f1 Diego Biurrun
178 8bbf6db9 Michael Niedermayer
    if(o->type == FF_OPT_TYPE_STRING)
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        return dst;
180 115329f1 Diego Biurrun
181 8bbf6db9 Michael Niedermayer
    switch(o->type){
182 233f6f88 Michael Niedermayer
    case FF_OPT_TYPE_FLAGS:     snprintf(buf, buf_len, "0x%08X",*(int    *)dst);break;
183 8bbf6db9 Michael Niedermayer
    case FF_OPT_TYPE_INT:       snprintf(buf, buf_len, "%d" , *(int    *)dst);break;
184 4733abcb Måns Rullgård
    case FF_OPT_TYPE_INT64:     snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
185 8bbf6db9 Michael Niedermayer
    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;
191 860a40c8 Michael Niedermayer
}
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193 8bbf6db9 Michael Niedermayer
static int av_get_number(void *obj, const char *name, AVOption **o_out, double *num, int *den, int64_t *intnum){
194 637b5326 Michael Niedermayer
    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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201 8bbf6db9 Michael Niedermayer
    if(o_out) *o_out= o;
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203 860a40c8 Michael Niedermayer
    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;
209 115329f1 Diego Biurrun
    case FF_OPT_TYPE_RATIONAL:  *intnum= ((AVRational*)dst)->num;
210 8bbf6db9 Michael Niedermayer
                                *den   = ((AVRational*)dst)->den;
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                                                        return 0;
212 860a40c8 Michael Niedermayer
    }
213 8bbf6db9 Michael Niedermayer
error:
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    *den=*intnum=0;
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    return -1;
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}
217
218
double av_get_double(void *obj, const char *name, AVOption **o_out){
219
    int64_t intnum=1;
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    double num=1;
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    int den=1;
222
223
    av_get_number(obj, name, o_out, &num, &den, &intnum);
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    return num*intnum/den;
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}
226
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AVRational av_get_q(void *obj, const char *name, AVOption **o_out){
228
    int64_t intnum=1;
229
    double num=1;
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    int den=1;
231
232
    av_get_number(obj, name, o_out, &num, &den, &intnum);
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    if(num == 1.0 && (int)intnum == intnum)
234
        return (AVRational){intnum, den};
235
    else
236
        return av_d2q(num*intnum/den, 1<<24);
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}
238
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int64_t av_get_int(void *obj, const char *name, AVOption **o_out){
240
    int64_t intnum=1;
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    double num=1;
242
    int den=1;
243
244
    av_get_number(obj, name, o_out, &num, &den, &intnum);
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    return num*intnum/den;
246
}
247
248 a1689e2f Michael Niedermayer
int av_opt_show(void *obj, void *av_log_obj){
249 8bbf6db9 Michael Niedermayer
    AVOption *opt=NULL;
250 115329f1 Diego Biurrun
251 8bbf6db9 Michael Niedermayer
    if(!obj)
252
        return -1;
253 a1689e2f Michael Niedermayer
254
    av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);
255 8bbf6db9 Michael Niedermayer
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 115329f1 Diego Biurrun
260 a1689e2f Michael Niedermayer
        av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);
261 88d6903e Antoine Cellerier
262
        switch( opt->type )
263
        {
264
            case FF_OPT_TYPE_FLAGS:
265
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>" );
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                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;
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            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>" );
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                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 a1689e2f Michael Niedermayer
        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' : '.');
292
        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' : '.');
294
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');
295 115329f1 Diego Biurrun
296 d2752a0d Michael Niedermayer
        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 8bbf6db9 Michael Niedermayer
    }
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    return 0;
301 860a40c8 Michael Niedermayer
}