opt.h

См. документацию.

/*
 * AVOptions
 * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
 *
 * 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 AVUTIL_OPT_H
#define AVUTIL_OPT_H
 
#include "rational.h"
#include "avutil.h"
#include "dict.h"
#include "log.h"
#include "pixfmt.h"
#include "samplefmt.h"
#include "version.h"
 
enum AVOptionType{
    AV_OPT_TYPE_FLAGS,
    AV_OPT_TYPE_INT,
    AV_OPT_TYPE_INT64,
    AV_OPT_TYPE_DOUBLE,
    AV_OPT_TYPE_FLOAT,
    AV_OPT_TYPE_STRING,
    AV_OPT_TYPE_RATIONAL,
    AV_OPT_TYPE_BINARY,  
    AV_OPT_TYPE_DICT,
    AV_OPT_TYPE_UINT64,
    AV_OPT_TYPE_CONST,
    AV_OPT_TYPE_IMAGE_SIZE, 
    AV_OPT_TYPE_PIXEL_FMT,
    AV_OPT_TYPE_SAMPLE_FMT,
    AV_OPT_TYPE_VIDEO_RATE, 
    AV_OPT_TYPE_DURATION,
    AV_OPT_TYPE_COLOR,
    AV_OPT_TYPE_CHANNEL_LAYOUT,
    AV_OPT_TYPE_BOOL,
};
 
typedef struct AVOption {
    const char *name;
 
    const char *help;
 
    int offset;
    enum AVOptionType type;
 
    union {
        int64_t i64;
        double dbl;
        const char *str;
        /* TODO those are unused now */
        AVRational q;
    } default_val;
    double min;                 
    double max;                 
 
    int flags;
#define AV_OPT_FLAG_ENCODING_PARAM  1   
#define AV_OPT_FLAG_DECODING_PARAM  2   
#define AV_OPT_FLAG_AUDIO_PARAM     8
#define AV_OPT_FLAG_VIDEO_PARAM     16
#define AV_OPT_FLAG_SUBTITLE_PARAM  32
 
#define AV_OPT_FLAG_EXPORT          64
 
#define AV_OPT_FLAG_READONLY        128
#define AV_OPT_FLAG_BSF_PARAM       (1<<8) 
#define AV_OPT_FLAG_FILTERING_PARAM (1<<16) 
#define AV_OPT_FLAG_DEPRECATED      (1<<17) 
//FIXME think about enc-audio, ... style flags
 
    const char *unit;
} AVOption;
 
typedef struct AVOptionRange {
    const char *str;
    double value_min, value_max;
    double component_min, component_max;
    int is_range;
} AVOptionRange;
 
typedef struct AVOptionRanges {
    AVOptionRange **range;
    int nb_ranges;
    int nb_components;
} AVOptionRanges;
 
int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags);
 
void av_opt_set_defaults(void *s);
 
void av_opt_set_defaults2(void *s, int mask, int flags);
 
int av_set_options_string(void *ctx, const char *opts,
                          const char *key_val_sep, const char *pairs_sep);
 
int av_opt_set_from_string(void *ctx, const char *opts,
                           const char *const *shorthand,
                           const char *key_val_sep, const char *pairs_sep);
void av_opt_free(void *obj);
 
int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name);
 
int av_opt_set_dict(void *obj, struct AVDictionary **options);
 
 
int av_opt_set_dict2(void *obj, struct AVDictionary **options, int search_flags);
 
int av_opt_get_key_value(const char **ropts,
                         const char *key_val_sep, const char *pairs_sep,
                         unsigned flags,
                         char **rkey, char **rval);
 
enum {
 
    AV_OPT_FLAG_IMPLICIT_KEY = 1,
};
 
int av_opt_eval_flags (void *obj, const AVOption *o, const char *val, int        *flags_out);
int av_opt_eval_int   (void *obj, const AVOption *o, const char *val, int        *int_out);
int av_opt_eval_int64 (void *obj, const AVOption *o, const char *val, int64_t    *int64_out);
int av_opt_eval_float (void *obj, const AVOption *o, const char *val, float      *float_out);
int av_opt_eval_double(void *obj, const AVOption *o, const char *val, double     *double_out);
int av_opt_eval_q     (void *obj, const AVOption *o, const char *val, AVRational *q_out);
#define AV_OPT_SEARCH_CHILDREN   (1 << 0) 
#define AV_OPT_SEARCH_FAKE_OBJ   (1 << 1)
 
#define AV_OPT_ALLOW_NULL (1 << 2)
 
#define AV_OPT_MULTI_COMPONENT_RANGE (1 << 12)
 
const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
                            int opt_flags, int search_flags);
 
const AVOption *av_opt_find2(void *obj, const char *name, const char *unit,
                             int opt_flags, int search_flags, void **target_obj);
 
const AVOption *av_opt_next(const void *obj, const AVOption *prev);
 
void *av_opt_child_next(void *obj, void *prev);
 
const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev);
 
int av_opt_set         (void *obj, const char *name, const char *val, int search_flags);
int av_opt_set_int     (void *obj, const char *name, int64_t     val, int search_flags);
int av_opt_set_double  (void *obj, const char *name, double      val, int search_flags);
int av_opt_set_q       (void *obj, const char *name, AVRational  val, int search_flags);
int av_opt_set_bin     (void *obj, const char *name, const uint8_t *val, int size, int search_flags);
int av_opt_set_image_size(void *obj, const char *name, int w, int h, int search_flags);
int av_opt_set_pixel_fmt (void *obj, const char *name, enum AVPixelFormat fmt, int search_flags);
int av_opt_set_sample_fmt(void *obj, const char *name, enum AVSampleFormat fmt, int search_flags);
int av_opt_set_video_rate(void *obj, const char *name, AVRational val, int search_flags);
int av_opt_set_channel_layout(void *obj, const char *name, int64_t ch_layout, int search_flags);
int av_opt_set_dict_val(void *obj, const char *name, const AVDictionary *val, int search_flags);
 
#define av_opt_set_int_list(obj, name, val, term, flags) \
    (av_int_list_length(val, term) > INT_MAX / sizeof(*(val)) ? \
     AVERROR(EINVAL) : \
     av_opt_set_bin(obj, name, (const uint8_t *)(val), \
                    av_int_list_length(val, term) * sizeof(*(val)), flags))
 
int av_opt_get         (void *obj, const char *name, int search_flags, uint8_t   **out_val);
int av_opt_get_int     (void *obj, const char *name, int search_flags, int64_t    *out_val);
int av_opt_get_double  (void *obj, const char *name, int search_flags, double     *out_val);
int av_opt_get_q       (void *obj, const char *name, int search_flags, AVRational *out_val);
int av_opt_get_image_size(void *obj, const char *name, int search_flags, int *w_out, int *h_out);
int av_opt_get_pixel_fmt (void *obj, const char *name, int search_flags, enum AVPixelFormat *out_fmt);
int av_opt_get_sample_fmt(void *obj, const char *name, int search_flags, enum AVSampleFormat *out_fmt);
int av_opt_get_video_rate(void *obj, const char *name, int search_flags, AVRational *out_val);
int av_opt_get_channel_layout(void *obj, const char *name, int search_flags, int64_t *ch_layout);
int av_opt_get_dict_val(void *obj, const char *name, int search_flags, AVDictionary **out_val);
void *av_opt_ptr(const AVClass *avclass, void *obj, const char *name);
 
void av_opt_freep_ranges(AVOptionRanges **ranges);
 
int av_opt_query_ranges(AVOptionRanges **, void *obj, const char *key, int flags);
 
int av_opt_copy(void *dest, const void *src);
 
int av_opt_query_ranges_default(AVOptionRanges **, void *obj, const char *key, int flags);
 
int av_opt_is_set_to_default(void *obj, const AVOption *o);
 
int av_opt_is_set_to_default_by_name(void *obj, const char *name, int search_flags);
 
 
#define AV_OPT_SERIALIZE_SKIP_DEFAULTS              0x00000001  
#define AV_OPT_SERIALIZE_OPT_FLAGS_EXACT            0x00000002  
 
 
int av_opt_serialize(void *obj, int opt_flags, int flags, char **buffer,
                     const char key_val_sep, const char pairs_sep);
#endif /* AVUTIL_OPT_H */