VAProcFilterParameterBufferColorBalance Struct Reference

Color balance filter parametrization. More...

#include <va_vpp.h>

Public Attributes
VAProcFilterType	type
	Filter type. Shall be set to VAProcFilterColorBalance.
VAProcColorBalanceType	attrib
	Color balance attribute.
float	value
	Color balance value. More...

Detailed Description

Color balance filter parametrization.

This buffer defines color balance attributes. A VA buffer can hold several color balance attributes by creating a VA buffer of desired number of elements. This can be achieved by the following pseudo-code:

enum { kHue, kSaturation, kBrightness, kContrast };

// Initial color balance parameters
static const VAProcFilterParameterBufferColorBalance colorBalanceParams[4] =
{
    [kHue] =
        { VAProcFilterColorBalance, VAProcColorBalanceHue, 0.5 },
    [kSaturation] =
        { VAProcFilterColorBalance, VAProcColorBalanceSaturation, 0.5 },
    [kBrightness] =
        { VAProcFilterColorBalance, VAProcColorBalanceBrightness, 0.5 },
    [kSaturation] =
        { VAProcFilterColorBalance, VAProcColorBalanceSaturation, 0.5 }
};

// Create buffer
VABufferID colorBalanceBuffer;
vaCreateBuffer(va_dpy, vpp_ctx,
    VAProcFilterParameterBufferType, sizeof(*pColorBalanceParam), 4,
    colorBalanceParams,
    &colorBalanceBuffer
);

VAProcFilterParameterBufferColorBalance *pColorBalanceParam;
vaMapBuffer(va_dpy, colorBalanceBuffer, &pColorBalanceParam);
{
    // Change brightness only
    pColorBalanceBuffer[kBrightness].value = 0.75;
}
vaUnmapBuffer(va_dpy, colorBalanceBuffer);

Member Data Documentation

float VAProcFilterParameterBufferColorBalance::value

Color balance value.

Special case for automatically adjusted attributes. e.g. VAProcColorBalanceAutoSaturation, VAProcColorBalanceAutoBrightness, VAProcColorBalanceAutoContrast.

• If value is 1.0 +/- FLT_EPSILON, the attribute is automatically adjusted and overrides any other attribute of the same type that would have been set explicitly;
• If value is 0.0 +/- FLT_EPSILON, the attribute is disabled and other attribute of the same type is used instead.

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The documentation for this struct was generated from the following file:

• va_vpp.h