www.pudn.com > ffmpeg-Sdk.rar > opt.h

/* 
 * AVOptions 
 * copyright (c) 2005 Michael Niedermayer  
 * 
 * This file is part of FFmpeg. 
 * 
 * FFmpeg 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 2.1 of the License, or (at your option) any later version. 
 * 
 * FFmpeg 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 FFmpeg; if not, write to the Free Software 
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 
 */ 
 
#ifndef FFMPEG_OPT_H 
#define FFMPEG_OPT_H 
 
/** 
 * @file opt.h 
 * AVOptions 
 */ 
 
#include "rational.h" 
 
enum AVOptionType{ 
    FF_OPT_TYPE_FLAGS, 
    FF_OPT_TYPE_INT, 
    FF_OPT_TYPE_INT64, 
    FF_OPT_TYPE_DOUBLE, 
    FF_OPT_TYPE_FLOAT, 
    FF_OPT_TYPE_STRING, 
    FF_OPT_TYPE_RATIONAL, 
    FF_OPT_TYPE_BINARY,  ///< offset must point to a pointer immediately followed by an int for the length 
    FF_OPT_TYPE_CONST=128, 
}; 
 
/** 
 * AVOption. 
 */ 
typedef struct AVOption { 
    const char *name; 
 
    /** 
     * short English text help. 
     * @todo what about other languages 
     */ 
    const char *help; 
    int offset;             ///< offset to context structure where the parsed value should be stored 
    enum AVOptionType type; 
 
    double default_val; 
    double min; 
    double max; 
 
    int flags; 
#define AV_OPT_FLAG_ENCODING_PARAM  1   ///< a generic parameter which can be set by the user for muxing or encoding 
#define AV_OPT_FLAG_DECODING_PARAM  2   ///< a generic parameter which can be set by the user for demuxing or decoding 
#define AV_OPT_FLAG_METADATA        4   ///< some data extracted or inserted into the file like title, comment, ... 
#define AV_OPT_FLAG_AUDIO_PARAM     8 
#define AV_OPT_FLAG_VIDEO_PARAM     16 
#define AV_OPT_FLAG_SUBTITLE_PARAM  32 
//FIXME think about enc-audio, ... style flags 
    const char *unit; 
} AVOption; 
 
 
const AVOption *av_find_opt(void *obj, const char *name, const char *unit, int mask, int flags); 
const AVOption *av_set_string(void *obj, const char *name, const char *val); 
const AVOption *av_set_double(void *obj, const char *name, double n); 
const AVOption *av_set_q(void *obj, const char *name, AVRational n); 
const AVOption *av_set_int(void *obj, const char *name, int64_t n); 
double av_get_double(void *obj, const char *name, const AVOption **o_out); 
AVRational av_get_q(void *obj, const char *name, const AVOption **o_out); 
int64_t av_get_int(void *obj, const char *name, const AVOption **o_out); 
const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len); 
const AVOption *av_next_option(void *obj, const AVOption *last); 
int av_opt_show(void *obj, void *av_log_obj); 
void av_opt_set_defaults(void *s); 
void av_opt_set_defaults2(void *s, int mask, int flags); 
 
#endif /* FFMPEG_OPT_H */