vf_eq.c File Reference

very simple video equalizer More...

#include "libavfilter/internal.h"
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "vf_eq.h"

Go to the source code of this file.

Macros
#define	OFFSET(x)   offsetof(EQContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Functions
static void	create_lut (EQParameters *param)
	TODO:
static void	apply_lut (EQParameters *param, uint8_t *dst, int dst_stride, const uint8_t *src, int src_stride, int w, int h)
static void	process_c (EQParameters *param, uint8_t *dst, int dst_stride, const uint8_t *src, int src_stride, int w, int h)
static void	check_values (EQParameters *param, EQContext *eq)
static void	set_contrast (EQContext *eq)
static void	set_brightness (EQContext *eq)
static void	set_gamma (EQContext *eq)
static void	set_saturation (EQContext *eq)
static int	set_expr (AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
static int	initialize (AVFilterContext *ctx)
static void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	process_command (AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
	AVFILTER_DEFINE_CLASS (eq)

Variables
static const AVFilterPad	eq_inputs []
static const AVFilterPad	eq_outputs []
static const AVOption	eq_options []
AVFilter	ff_vf_eq

Detailed Description

very simple video equalizer

Definition in file vf_eq.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(EQContext, x)

Definition at line 346 of file vf_eq.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 347 of file vf_eq.c.

Function Documentation

static void create_lut ( EQParameters *  param )

static

TODO:

• Add support to process_command

Definition at line 42 of file vf_eq.c.

Referenced by apply_lut().

static void apply_lut ( EQParameters *  param, uint8_t *  dst, int  dst_stride, const uint8_t *  src, int  src_stride, int  w, int  h  )

static

Definition at line 67 of file vf_eq.c.

Referenced by check_values().

static void process_c ( EQParameters *  param, uint8_t *  dst, int  dst_stride, const uint8_t *  src, int  src_stride, int  w, int  h  )

static

Definition at line 82 of file vf_eq.c.

Referenced by initialize().

static void check_values ( EQParameters *  param, EQContext *  eq  )

static

Definition at line 102 of file vf_eq.c.

Referenced by set_brightness(), set_contrast(), set_gamma(), and set_saturation().

static void set_contrast ( EQContext *  eq )

static

Definition at line 112 of file vf_eq.c.

Referenced by initialize(), and process_command().

static void set_brightness ( EQContext *  eq )

static

Definition at line 120 of file vf_eq.c.

Referenced by initialize(), and process_command().

static void set_gamma ( EQContext *  eq )

static

Definition at line 128 of file vf_eq.c.

Referenced by initialize(), and process_command().

static void set_saturation ( EQContext *  eq )

static

Definition at line 149 of file vf_eq.c.

Referenced by initialize(), and process_command().

static int set_expr ( AVExpr **  pexpr, const char *  expr, const char *  option, void *  log_ctx  )

static

Definition at line 162 of file vf_eq.c.

Referenced by initialize(), and process_command().

static int initialize ( AVFilterContext *  ctx )

static

Definition at line 183 of file vf_eq.c.

static void uninit ( AVFilterContext *  ctx )

static

Definition at line 211 of file vf_eq.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 225 of file vf_eq.c.

static int filter_frame ( AVFilterLink *  inlink, AVFrame *  in  )

static

Definition at line 242 of file vf_eq.c.

static int process_command ( AVFilterContext *  ctx, const char *  cmd, const char *  args, char *  res, int  res_len, int  flags  )

static

Definition at line 279 of file vf_eq.c.

AVFILTER_DEFINE_CLASS

(

eq

)

Variable Documentation

const AVFilterPad eq_inputs[]

static

Initial value:

= {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
    },
    { NULL }
}

Definition at line 329 of file vf_eq.c.

const AVFilterPad eq_outputs[]

static

Initial value:

= {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
}

Definition at line 338 of file vf_eq.c.

const AVOption eq_options[]

static

Initial value:

= {
    { "contrast",     "set the contrast adjustment, negative values give a negative image",
        OFFSET(contrast_expr),     AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "brightness",   "set the brightness adjustment",
        OFFSET(brightness_expr),   AV_OPT_TYPE_STRING, {.str = "0.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "saturation",   "set the saturation adjustment",
        OFFSET(saturation_expr),   AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "gamma",        "set the initial gamma value",
        OFFSET(gamma_expr),        AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "gamma_r",      "gamma value for red",
        OFFSET(gamma_r_expr),      AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "gamma_g",      "gamma value for green",
        OFFSET(gamma_g_expr),      AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "gamma_b",      "gamma value for blue",
        OFFSET(gamma_b_expr),      AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "gamma_weight", "set the gamma weight which reduces the effect of gamma on bright areas",
        OFFSET(gamma_weight_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { NULL }
}

Definition at line 349 of file vf_eq.c.

AVFilter ff_vf_eq

Initial value:

= {
    .name            = "eq",
    .description     = NULL_IF_CONFIG_SMALL("Adjust brightness, contrast, gamma, and saturation."),
    .priv_size       = sizeof(EQContext),
    .priv_class      = &eq_class,
    .inputs          = eq_inputs,
    .outputs         = eq_outputs,
    .process_command = process_command,
    .query_formats   = query_formats,
    .init            = initialize,
    .uninit          = uninit,
}

Definition at line 371 of file vf_eq.c.