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...
uint32_t	va_reserved [VA_PADDING_LOW]
	Reserved bytes for future use, must be zero.

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

value

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