Class: AVAssetWriterInputPixelBufferAdaptor
Overview
You use an AVAssetWriterInputPixelBufferAdaptor to append video samples packaged as CVPixelBuffer objects to a single AVAssetWriterInput object.
Instance Attribute Summary (collapse)
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- assetWriterInput
readonly
The asset writer input to which the adaptor should append pixel buffers.
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- pixelBufferPool
readonly
A pixel buffer pool that will vend and efficiently recycle CVPixelBuffer objects that can be appended to the receiver.
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- sourcePixelBufferAttributes
readonly
The pixel buffer attributes of pixel buffers that will be vended by the adaptor’s CVPixelBufferPool.
Class Method Summary (collapse)
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+ assetWriterInputPixelBufferAdaptorWithAssetWriterInput:sourcePixelBufferAttributes:
Returns a new pixel buffer adaptor to receive pixel buffers for writing to the output file.
Instance Method Summary (collapse)
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- appendPixelBuffer:withPresentationTime:
Appends a pixel buffer to the receiver.
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- initWithAssetWriterInput:sourcePixelBufferAttributes:
Initializes a new pixel buffer adaptor to receive pixel buffers for writing to the output file.
Methods inherited from NSObject
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Constructor Details
This class inherits a constructor from NSObject
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class NSObject
Instance Attribute Details
- (AVAssetWriterInput) assetWriterInput (readonly)
The asset writer input to which the adaptor should append pixel buffers. (read-only)
- (CVPixelBufferPoolRef) pixelBufferPool (readonly)
A pixel buffer pool that will vend and efficiently recycle CVPixelBuffer objects that can be appended to the receiver. (read-only) For maximum efficiency, you should create CVPixelBuffer objects for appendPixelBuffer:withPresentationTime: by using this pool with the CVPixelBufferPoolCreatePixelBuffer function.This property is NULL before the first call to startSessionAtTime:on the associated AVAssetWriter object.This property is key value observable.
- (Hash) sourcePixelBufferAttributes (readonly)
The pixel buffer attributes of pixel buffers that will be vended by the
adaptor’s CVPixelBufferPool. (read-only) The value of this property is a
dictionary containing pixel buffer attributes keys defined in
Class Method Details
+ (AVAssetWriterInputPixelBufferAdaptor) assetWriterInputPixelBufferAdaptorWithAssetWriterInput(input, sourcePixelBufferAttributes:sourcePixelBufferAttributes)
Returns a new pixel buffer adaptor to receive pixel buffers for writing to the output file. To specify the pixel format type, the pixelBufferAttributes dictionary should contain a value for kCVPixelBufferPixelFormatTypeKey. For example, use [NSNumber numberWithInt:kCVPixelFormatType_32BGRA] for 8-bit-per-channel BGRA, or use [NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange] for 2-plane YCbCr.
Instance Method Details
- (Boolean) appendPixelBuffer(pixelBuffer, withPresentationTime:presentationTime)
Appends a pixel buffer to the receiver. If the operation was unsuccessful, you might invoke the AVAssetWriter object’s finishWriting method in order to save a partially completed asset.
- (Object) initWithAssetWriterInput(input, sourcePixelBufferAttributes:sourcePixelBufferAttributes)
Initializes a new pixel buffer adaptor to receive pixel buffers for writing to the output file. To specify the pixel format type, the pixelBufferAttributes dictionary should contain a value for kCVPixelBufferPixelFormatTypeKey. For example, use [NSNumber numberWithInt:kCVPixelFormatType_32BGRA] for 8-bit-per-channel BGRA, or use [NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange] for 2-plane YCbCr.