libavcodec/opt.c

   1 /*
   2  * AVOptions
   3  * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file libavcodec/opt.c
  24  * AVOptions
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #include "avcodec.h"
  29 #include "opt.h"
  30 #include "eval.h"
  31
  32 //FIXME order them and do a bin search
  33 const AVOption *av_find_opt(void *v, const char *name, const char *unit, int mask, int flags){
  34     AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
  35     const AVOption *o= c->option;
  36
  37     for(;o && o->name; o++){
  38         if(!strcmp(o->name, name) && (!unit || (o->unit && !strcmp(o->unit, unit))) && (o->flags & mask) == flags )
  39             return o;
  40     }
  41     return NULL;
  42 }
  43
  44 const AVOption *av_next_option(void *obj, const AVOption *last){
  45     if(last && last[1].name) return ++last;
  46     else if(last)            return NULL;
  47     else                     return (*(AVClass**)obj)->option;
  48 }
  49
  50 static int av_set_number2(void *obj, const char *name, double num, int den, int64_t intnum, const AVOption **o_out){
  51     const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
  52     void *dst;
  53     if(o_out)
  54         *o_out= o;
  55     if(!o || o->offset<=0)
  56         return AVERROR(ENOENT);
  57
  58     if(o->max*den < num*intnum || o->min*den > num*intnum) {
  59         av_log(NULL, AV_LOG_ERROR, "Value %lf for parameter '%s' out of range\n", num, name);
  60         return AVERROR(ERANGE);
  61     }
  62
  63     dst= ((uint8_t*)obj) + o->offset;
  64
  65     switch(o->type){
  66     case FF_OPT_TYPE_FLAGS:
  67     case FF_OPT_TYPE_INT:   *(int       *)dst= llrint(num/den)*intnum; break;
  68     case FF_OPT_TYPE_INT64: *(int64_t   *)dst= llrint(num/den)*intnum; break;
  69     case FF_OPT_TYPE_FLOAT: *(float     *)dst= num*intnum/den;         break;
  70     case FF_OPT_TYPE_DOUBLE:*(double    *)dst= num*intnum/den;         break;
  71     case FF_OPT_TYPE_RATIONAL:
  72         if((int)num == num) *(AVRational*)dst= (AVRational){num*intnum, den};
  73         else                *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);
  74         break;
  75     default:
  76         return AVERROR(EINVAL);
  77     }
  78     return 0;
  79 }
  80
  81 static const AVOption *av_set_number(void *obj, const char *name, double num, int den, int64_t intnum){
  82     const AVOption *o = NULL;
  83     if (av_set_number2(obj, name, num, den, intnum, &o) < 0)
  84         return NULL;
  85     else
  86         return o;
  87 }
  88
  89 static const double const_values[]={
  90     M_PI,
  91     M_E,
  92     FF_QP2LAMBDA,
  93     0
  94 };
  95
  96 static const char * const const_names[]={
  97     "PI",
  98     "E",
  99     "QP2LAMBDA",
 100     0
 101 };
 102
 103 static int hexchar2int(char c) {
 104     if (c >= '0' && c <= '9') return c - '0';
 105     if (c >= 'a' && c <= 'f') return c - 'a' + 10;
 106     if (c >= 'A' && c <= 'F') return c - 'A' + 10;
 107     return -1;
 108 }
 109
 110 int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out){
 111     int ret;
 112     const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
 113     if (o_out)
 114         *o_out = o;
 115     if(!o)
 116         return AVERROR(ENOENT);
 117     if(!val || o->offset<=0)
 118         return AVERROR(EINVAL);
 119
 120     if(o->type == FF_OPT_TYPE_BINARY){
 121         uint8_t **dst = (uint8_t **)(((uint8_t*)obj) + o->offset);
 122         int *lendst = (int *)(dst + 1);
 123         uint8_t *bin, *ptr;
 124         int len = strlen(val);
 125         av_freep(dst);
 126         *lendst = 0;
 127         if (len & 1) return AVERROR(EINVAL);
 128         len /= 2;
 129         ptr = bin = av_malloc(len);
 130         while (*val) {
 131             int a = hexchar2int(*val++);
 132             int b = hexchar2int(*val++);
 133             if (a < 0 || b < 0) {
 134                 av_free(bin);
 135                 return AVERROR(EINVAL);
 136             }
 137             *ptr++ = (a << 4) | b;
 138         }
 139         *dst = bin;
 140         *lendst = len;
 141         return 0;
 142     }
 143     if(o->type != FF_OPT_TYPE_STRING){
 144         int notfirst=0;
 145         for(;;){
 146             int i;
 147             char buf[256];
 148             int cmd=0;
 149             double d;
 150             const char *error = NULL;
 151
 152             if(*val == '+' || *val == '-')
 153                 cmd= *(val++);
 154
 155             for(i=0; i<sizeof(buf)-1 && val[i] && val[i]!='+' && val[i]!='-'; i++)
 156                 buf[i]= val[i];
 157             buf[i]=0;
 158
 159             d = ff_eval2(buf, const_values, const_names, NULL, NULL, NULL, NULL, NULL, &error);
 160             if(isnan(d)) {
 161                 const AVOption *o_named= av_find_opt(obj, buf, o->unit, 0, 0);
 162                 if(o_named && o_named->type == FF_OPT_TYPE_CONST)
 163                     d= o_named->default_val;
 164                 else if(!strcmp(buf, "default")) d= o->default_val;
 165                 else if(!strcmp(buf, "max"    )) d= o->max;
 166                 else if(!strcmp(buf, "min"    )) d= o->min;
 167                 else if(!strcmp(buf, "none"   )) d= 0;
 168                 else if(!strcmp(buf, "all"    )) d= ~0;
 169                 else {
 170                     if (error)
 171                         av_log(NULL, AV_LOG_ERROR, "Unable to parse option value \"%s\": %s\n", val, error);
 172                     return AVERROR(EINVAL);
 173                 }
 174             }
 175             if(o->type == FF_OPT_TYPE_FLAGS){
 176                 if     (cmd=='+') d= av_get_int(obj, name, NULL) | (int64_t)d;
 177                 else if(cmd=='-') d= av_get_int(obj, name, NULL) &~(int64_t)d;
 178             }else{
 179                 if     (cmd=='+') d= notfirst*av_get_double(obj, name, NULL) + d;
 180                 else if(cmd=='-') d= notfirst*av_get_double(obj, name, NULL) - d;
 181             }
 182
 183             if ((ret = av_set_number2(obj, name, d, 1, 1, o_out)) < 0)
 184                 return ret;
 185             val+= i;
 186             if(!*val)
 187                 return 0;
 188             notfirst=1;
 189         }
 190         return AVERROR(EINVAL);
 191     }
 192
 193     if(alloc){
 194         av_free(*(void**)(((uint8_t*)obj) + o->offset));
 195         val= av_strdup(val);
 196     }
 197
 198     memcpy(((uint8_t*)obj) + o->offset, &val, sizeof(val));
 199     return 0;
 200 }
 201
 202 #if LIBAVCODEC_VERSION_MAJOR < 53
 203 const AVOption *av_set_string2(void *obj, const char *name, const char *val, int alloc){
 204     const AVOption *o;
 205     if (av_set_string3(obj, name, val, alloc, &o) < 0)
 206         return NULL;
 207     return o;
 208 }
 209
 210 const AVOption *av_set_string(void *obj, const char *name, const char *val){
 211     const AVOption *o;
 212     if (av_set_string3(obj, name, val, 0, &o) < 0)
 213         return NULL;
 214     return o;
 215 }
 216 #endif
 217
 218 const AVOption *av_set_double(void *obj, const char *name, double n){
 219     return av_set_number(obj, name, n, 1, 1);
 220 }
 221
 222 const AVOption *av_set_q(void *obj, const char *name, AVRational n){
 223     return av_set_number(obj, name, n.num, n.den, 1);
 224 }
 225
 226 const AVOption *av_set_int(void *obj, const char *name, int64_t n){
 227     return av_set_number(obj, name, 1, 1, n);
 228 }
 229
 230 /**
 231  *
 232  * @param buf a buffer which is used for returning non string values as strings, can be NULL
 233  * @param buf_len allocated length in bytes of buf
 234  */
 235 const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len){
 236     const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
 237     void *dst;
 238     uint8_t *bin;
 239     int len, i;
 240     if(!o || o->offset<=0)
 241         return NULL;
 242     if(o->type != FF_OPT_TYPE_STRING && (!buf || !buf_len))
 243         return NULL;
 244
 245     dst= ((uint8_t*)obj) + o->offset;
 246     if(o_out) *o_out= o;
 247
 248     switch(o->type){
 249     case FF_OPT_TYPE_FLAGS:     snprintf(buf, buf_len, "0x%08X",*(int    *)dst);break;
 250     case FF_OPT_TYPE_INT:       snprintf(buf, buf_len, "%d" , *(int    *)dst);break;
 251     case FF_OPT_TYPE_INT64:     snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
 252     case FF_OPT_TYPE_FLOAT:     snprintf(buf, buf_len, "%f" , *(float  *)dst);break;
 253     case FF_OPT_TYPE_DOUBLE:    snprintf(buf, buf_len, "%f" , *(double *)dst);break;
 254     case FF_OPT_TYPE_RATIONAL:  snprintf(buf, buf_len, "%d/%d", ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;
 255     case FF_OPT_TYPE_STRING:    return *(void**)dst;
 256     case FF_OPT_TYPE_BINARY:
 257         len = *(int*)(((uint8_t *)dst) + sizeof(uint8_t *));
 258         if(len >= (buf_len + 1)/2) return NULL;
 259         bin = *(uint8_t**)dst;
 260         for(i = 0; i < len; i++) snprintf(buf + i*2, 3, "%02X", bin[i]);
 261         break;
 262     default: return NULL;
 263     }
 264     return buf;
 265 }
 266
 267 static int av_get_number(void *obj, const char *name, const AVOption **o_out, double *num, int *den, int64_t *intnum){
 268     const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
 269     void *dst;
 270     if(!o || o->offset<=0)
 271         goto error;
 272
 273     dst= ((uint8_t*)obj) + o->offset;
 274
 275     if(o_out) *o_out= o;
 276
 277     switch(o->type){
 278     case FF_OPT_TYPE_FLAGS:     *intnum= *(unsigned int*)dst;return 0;
 279     case FF_OPT_TYPE_INT:       *intnum= *(int    *)dst;return 0;
 280     case FF_OPT_TYPE_INT64:     *intnum= *(int64_t*)dst;return 0;
 281     case FF_OPT_TYPE_FLOAT:     *num=    *(float  *)dst;return 0;
 282     case FF_OPT_TYPE_DOUBLE:    *num=    *(double *)dst;return 0;
 283     case FF_OPT_TYPE_RATIONAL:  *intnum= ((AVRational*)dst)->num;
 284                                 *den   = ((AVRational*)dst)->den;
 285                                                         return 0;
 286     }
 287 error:
 288     *den=*intnum=0;
 289     return -1;
 290 }
 291
 292 double av_get_double(void *obj, const char *name, const AVOption **o_out){
 293     int64_t intnum=1;
 294     double num=1;
 295     int den=1;
 296
 297     av_get_number(obj, name, o_out, &num, &den, &intnum);
 298     return num*intnum/den;
 299 }
 300
 301 AVRational av_get_q(void *obj, const char *name, const AVOption **o_out){
 302     int64_t intnum=1;
 303     double num=1;
 304     int den=1;
 305
 306     av_get_number(obj, name, o_out, &num, &den, &intnum);
 307     if(num == 1.0 && (int)intnum == intnum)
 308         return (AVRational){intnum, den};
 309     else
 310         return av_d2q(num*intnum/den, 1<<24);
 311 }
 312
 313 int64_t av_get_int(void *obj, const char *name, const AVOption **o_out){
 314     int64_t intnum=1;
 315     double num=1;
 316     int den=1;
 317
 318     av_get_number(obj, name, o_out, &num, &den, &intnum);
 319     return num*intnum/den;
 320 }
 321
 322 static void opt_list(void *obj, void *av_log_obj, const char *unit)
 323 {
 324     const AVOption *opt=NULL;
 325
 326     while((opt= av_next_option(obj, opt))){
 327         if(!(opt->flags & (AV_OPT_FLAG_ENCODING_PARAM|AV_OPT_FLAG_DECODING_PARAM)))
 328             continue;
 329
 330         /* Don't print CONST's on level one.
 331          * Don't print anything but CONST's on level two.
 332          * Only print items from the requested unit.
 333          */
 334         if (!unit && opt->type==FF_OPT_TYPE_CONST)
 335             continue;
 336         else if (unit && opt->type!=FF_OPT_TYPE_CONST)
 337             continue;
 338         else if (unit && opt->type==FF_OPT_TYPE_CONST && strcmp(unit, opt->unit))
 339             continue;
 340         else if (unit && opt->type == FF_OPT_TYPE_CONST)
 341             av_log(av_log_obj, AV_LOG_INFO, "   %-15s ", opt->name);
 342         else
 343             av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);
 344
 345         switch( opt->type )
 346         {
 347             case FF_OPT_TYPE_FLAGS:
 348                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>" );
 349                 break;
 350             case FF_OPT_TYPE_INT:
 351                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int>" );
 352                 break;
 353             case FF_OPT_TYPE_INT64:
 354                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>" );
 355                 break;
 356             case FF_OPT_TYPE_DOUBLE:
 357                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<double>" );
 358                 break;
 359             case FF_OPT_TYPE_FLOAT:
 360                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<float>" );
 361                 break;
 362             case FF_OPT_TYPE_STRING:
 363                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<string>" );
 364                 break;
 365             case FF_OPT_TYPE_RATIONAL:
 366                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>" );
 367                 break;
 368             case FF_OPT_TYPE_BINARY:
 369                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<binary>" );
 370                 break;
 371             case FF_OPT_TYPE_CONST:
 372             default:
 373                 av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "" );
 374                 break;
 375         }
 376         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
 377         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
 378         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM   ) ? 'V' : '.');
 379         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM   ) ? 'A' : '.');
 380         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');
 381
 382         if(opt->help)
 383             av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
 384         av_log(av_log_obj, AV_LOG_INFO, "\n");
 385         if (opt->unit && opt->type != FF_OPT_TYPE_CONST) {
 386             opt_list(obj, av_log_obj, opt->unit);
 387         }
 388     }
 389 }
 390
 391 int av_opt_show(void *obj, void *av_log_obj){
 392     if(!obj)
 393         return -1;
 394
 395     av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);
 396
 397     opt_list(obj, av_log_obj, NULL);
 398
 399     return 0;
 400 }
 401
 402 /** Set the values of the AVCodecContext or AVFormatContext structure.
 403  * They are set to the defaults specified in the according AVOption options
 404  * array default_val field.
 405  *
 406  * @param s AVCodecContext or AVFormatContext for which the defaults will be set
 407  */
 408 void av_opt_set_defaults2(void *s, int mask, int flags)
 409 {
 410     const AVOption *opt = NULL;
 411     while ((opt = av_next_option(s, opt)) != NULL) {
 412         if((opt->flags & mask) != flags)
 413             continue;
 414         switch(opt->type) {
 415             case FF_OPT_TYPE_CONST:
 416                 /* Nothing to be done here */
 417             break;
 418             case FF_OPT_TYPE_FLAGS:
 419             case FF_OPT_TYPE_INT: {
 420                 int val;
 421                 val = opt->default_val;
 422                 av_set_int(s, opt->name, val);
 423             }
 424             break;
 425             case FF_OPT_TYPE_INT64:
 426                 if((double)(opt->default_val+0.6) == opt->default_val)
 427                     av_log(s, AV_LOG_DEBUG, "loss of precission in default of %s\n", opt->name);
 428                 av_set_int(s, opt->name, opt->default_val);
 429             break;
 430             case FF_OPT_TYPE_FLOAT: {
 431                 double val;
 432                 val = opt->default_val;
 433                 av_set_double(s, opt->name, val);
 434             }
 435             break;
 436             case FF_OPT_TYPE_RATIONAL: {
 437                 AVRational val;
 438                 val = av_d2q(opt->default_val, INT_MAX);
 439                 av_set_q(s, opt->name, val);
 440             }
 441             break;
 442             case FF_OPT_TYPE_STRING:
 443             case FF_OPT_TYPE_BINARY:
 444                 /* Cannot set default for string as default_val is of type * double */
 445             break;
 446             default:
 447                 av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n", opt->type, opt->name);
 448         }
 449     }
 450 }
 451
 452 void av_opt_set_defaults(void *s){
 453     av_opt_set_defaults2(s, 0, 0);
 454 }
 455