Soundtrack Pro: Unexpected results when exporting multichannel audio files
Exporting tracks, busses, or submixes may include unintended channel selections of multichannel clips in the exported file. After exporting, unintended channel selections of multichannel clips may be included during playback.
MPSImageSobel(3) MetalPerformanceShaders.framework MPSImageSobel(3)NAME
MPSImageSobel
SYNOPSIS
#import <MPSImageConvolution.h>
Inherits MPSUnaryImageKernel.
Instance Methods
(nonnull instancetype) - initWithDevice:
(nonnull instancetype) - initWithDevice:linearGrayColorTransform:
(nullable instancetype) - initWithCoder:device:
Properties
const float * colorTransform
Additional Inherited Members
Detailed Description
The MPSImageSobel implements the Sobel filter. When the color model (e.g. RGB, two-channel, grayscale, etc.) of source and destination
textures match, the filter is applied to each channel separately. If the destination is monochrome (single channel) but source
multichannel, the pixel values are converted to grayscale before applying Sobel operator using the linear gray color transform vector (v).
Luminance = v[0] * pixel.x + v[1] * pixel.y + v[2] * pixel.z;
Method Documentation
- (nullable instancetype) initWithCoder: (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) device
NSSecureCoding compatability While the standard NSSecureCoding/NSCoding method -initWithCoder: should work, since the file can't know
which device your data is allocated on, we have to guess and may guess incorrectly. To avoid that problem, use initWithCoder:device
instead.
Parameters:
aDecoder The NSCoder subclass with your serialized MPSKernel
device The MTLDevice on which to make the MPSKernel
Returns:
A new MPSKernel object, or nil if failure.
Reimplemented from MPSUnaryImageKernel.
- (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device
Initialize a Sobel filter on a given device using the default color transform. Default: BT.601/JPEG {0.299f, 0.587f, 0.114f}
For non-default conversion matrices, use -initWithDevice:linearGrayColorTransform:
Parameters:
device The device the filter will run on
Returns:
A valid object or nil, if failure.
Reimplemented from MPSUnaryImageKernel.
- (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device(const float *__nonnull) transform
Initialize a Sobel filter on a given device with a non-default color transform
Parameters:
device The device the filter will run on
transform Array of three floats describing the rgb to gray scale color transform.
Luminance = transform[0] * pixel.x +
transform[1] * pixel.y +
transform[2] * pixel.z;
Returns:
A valid object or nil, if failure.
Property Documentation
- colorTransform [read], [nonatomic], [assign]
Returns a pointer to the array of three floats used to convert RGBA, RGB or RG images to the destination format when the destination is
monochrome.
Author
Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code.
Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageSobel(3)
