Package apple.avfoundation

Class AVAssetWriterInputPixelBufferAdaptor

  • All Implemented Interfaces:
    NSObject
    public class AVAssetWriterInputPixelBufferAdaptor
extends NSObject
    AVAssetWriterInputPixelBufferAdaptor Defines an interface for appending video samples packaged as CVPixelBuffer objects to a single AVAssetWriterInput object. Instances of AVAssetWriterInputPixelBufferAdaptor provide a CVPixelBufferPool that can be used to allocate pixel buffers for writing to the output file. Using the provided pixel buffer pool for buffer allocation is typically more efficient than appending pixel buffers allocated using a separate pool. API-Since: 4.1

    • Constructor Detail

      • AVAssetWriterInputPixelBufferAdaptor

        protected AVAssetWriterInputPixelBufferAdaptor​(org.moe.natj.general.Pointer peer)

    • Method Detail

      • accessInstanceVariablesDirectly

        public static boolean accessInstanceVariablesDirectly()

      • assetWriterInputPixelBufferAdaptorWithAssetWriterInputSourcePixelBufferAttributes

        public static AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInputSourcePixelBufferAttributes​(@NotNull
                                                                                                                                     @NotNull AVAssetWriterInput input,
                                                                                                                                     @Nullable
                                                                                                                                     @Nullable NSDictionary<java.lang.String,​?> sourcePixelBufferAttributes)
        assetWriterInputPixelBufferAdaptorWithAssetWriterInput:sourcePixelBufferAttributes: Creates a new pixel buffer adaptor to receive pixel buffers for writing to the output file. In order to take advantage of the improved efficiency of appending buffers created from the adaptor's pixel buffer pool, clients should specify pixel buffer attributes that most closely accommodate the source format of the video frames being appended. Pixel buffer attributes keys for the pixel buffer pool are defined in . 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. See the discussion under appendPixelBuffer:withPresentationTime: for advice on choosing a pixel format. Clients that do not need a pixel buffer pool for allocating buffers should set sourcePixelBufferAttributes to nil. This method throws an exception if the input is already attached to another asset writer input pixel buffer adaptor or if the input has already started writing (the asset writer has progressed beyond AVAssetWriterStatusUnknown).
        Parameters:
        input - An instance of AVAssetWriterInput to which the receiver should append pixel buffers. Currently, only asset writer inputs that accept media data of type AVMediaTypeVideo can be used to initialize a pixel buffer adaptor.
        sourcePixelBufferAttributes - Specifies the attributes of pixel buffers that will be vended by the input's CVPixelBufferPool.
        Returns:
        An instance of AVAssetWriterInputPixelBufferAdaptor.

      • automaticallyNotifiesObserversForKey

        public static boolean automaticallyNotifiesObserversForKey​(@NotNull
                                                           @NotNull java.lang.String key)

      • cancelPreviousPerformRequestsWithTarget

        public static void cancelPreviousPerformRequestsWithTarget​(@NotNull
                                                           @NotNull java.lang.Object aTarget)

      • cancelPreviousPerformRequestsWithTargetSelectorObject

        public static void cancelPreviousPerformRequestsWithTargetSelectorObject​(@NotNull
                                                                         @NotNull java.lang.Object aTarget,
                                                                         @NotNull
                                                                         @NotNull org.moe.natj.objc.SEL aSelector,
                                                                         @Nullable
                                                                         @Nullable java.lang.Object anArgument)

      • classFallbacksForKeyedArchiver

        @NotNull
public static @NotNull NSArray<java.lang.String> classFallbacksForKeyedArchiver()

      • classForKeyedUnarchiver

        @NotNull
public static @NotNull org.moe.natj.objc.Class classForKeyedUnarchiver()

      • debugDescription_static

        public static java.lang.String debugDescription_static()

      • description_static

        public static java.lang.String description_static()

      • hash_static

        public static long hash_static()

      • instanceMethodSignatureForSelector

        public static NSMethodSignature instanceMethodSignatureForSelector​(org.moe.natj.objc.SEL aSelector)

      • instancesRespondToSelector

        public static boolean instancesRespondToSelector​(org.moe.natj.objc.SEL aSelector)

      • isSubclassOfClass

        public static boolean isSubclassOfClass​(org.moe.natj.objc.Class aClass)

      • keyPathsForValuesAffectingValueForKey

        @NotNull
public static @NotNull NSSet<java.lang.String> keyPathsForValuesAffectingValueForKey​(@NotNull
                                                                                     @NotNull java.lang.String key)

      • resolveClassMethod

        public static boolean resolveClassMethod​(org.moe.natj.objc.SEL sel)

      • resolveInstanceMethod

        public static boolean resolveInstanceMethod​(org.moe.natj.objc.SEL sel)

      • setVersion_static

        public static void setVersion_static​(long aVersion)

      • superclass_static

        public static org.moe.natj.objc.Class superclass_static()

      • version_static

        public static long version_static()

      • appendPixelBufferWithPresentationTime

        public boolean appendPixelBufferWithPresentationTime​(@NotNull
                                                     @NotNull CVBufferRef pixelBuffer,
                                                     CMTime presentationTime)
        appendPixelBuffer:withPresentationTime: Appends a pixel buffer to the receiver. The receiver will retain the CVPixelBuffer until it is done with it, and then release it. Do not modify a CVPixelBuffer or its contents after you have passed it to this method. For optimal performance the format of the pixel buffer should match one of the native formats supported by the selected video encoder. Below are some recommendations: The H.264 and HEVC encoders natively support kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange and kCVPixelFormatType_420YpCbCr8BiPlanarFullRange, which should be used with 8-bit 4:2:0 video and full range input respectively; other related pixel formats in CoreVideo/CVPixelBuffer.h are ideal for 4:2:2 and 4:4:4 (and for HEVC, 10-bit). The JPEG encoder on iOS and Apple Silicon macOS natively supports kCVPixelFormatType_422YpCbCr8FullRange. If you need to work in the RGB domain then kCVPixelFormatType_32BGRA is recommended on iOS and macOS. Pixel buffers not in a natively supported format will be converted internally prior to encoding when possible. Pixel format conversions within the same range (video or full) are generally faster than conversions between different ranges. The ProRes encoders can preserve high bit depth sources, supporting up to 12bits/ch. ProRes 4444 can contain a mathematically lossless alpha channel and it doesn't do any chroma subsampling. This makes ProRes 4444 ideal for quality critical applications. If you are working with 8bit sources ProRes is also a good format to use due to its high image quality. Use either of the recommended pixel formats above. Note that RGB pixel formats by definition have 4:4:4 chroma sampling. If you are working with high bit depth sources the following yuv pixel formats are recommended when encoding to ProRes: kCVPixelFormatType_4444AYpCbCr16, kCVPixelFormatType_422YpCbCr16, and kCVPixelFormatType_422YpCbCr10. When working in the RGB domain kCVPixelFormatType_64ARGB is recommended. Scaling and color matching are not currently supported when using AVAssetWriter with any of these high bit depth pixel formats. Please make sure that your track's output settings dictionary specifies the same width and height as the buffers you will be appending. Do not include AVVideoScalingModeKey or AVVideoColorPropertiesKey. Before calling this method, you must ensure that the input that underlies the receiver is attached to an AVAssetWriter via a prior call to -addInput: and that -startWriting has been called on the asset writer. It is an error to invoke this method before starting a session (via -[AVAssetWriter startSessionAtSourceTime:]) or after ending a session (via -[AVAssetWriter endSessionAtSourceTime:]). This method throws an exception if the presentation time is is non-numeric (see CMTIME_IS_NUMERIC) or if "readyForMoreMediaData" is NO.
        Parameters:
        pixelBuffer - The CVPixelBuffer to be appended.
        presentationTime - The presentation time for the pixel buffer to be appended. This time will be considered relative to the time passed to -[AVAssetWriter startSessionAtSourceTime:] to determine the timing of the frame in the output file.
        Returns:
        A BOOL value indicating success of appending the pixel buffer. If a result of NO is returned, clients can check the value of AVAssetWriter.status to determine whether the writing operation completed, failed, or was cancelled. If the status is AVAssetWriterStatusFailed, AVAsset.error will contain an instance of NSError that describes the failure.

      • assetWriterInput

        @NotNull
public @NotNull AVAssetWriterInput assetWriterInput()
        [@property] assetWriterInput The asset writer input to which the receiver should append pixel buffers.

      • initWithAssetWriterInputSourcePixelBufferAttributes

        public AVAssetWriterInputPixelBufferAdaptor initWithAssetWriterInputSourcePixelBufferAttributes​(@NotNull
                                                                                                @NotNull AVAssetWriterInput input,
                                                                                                @Nullable
                                                                                                @Nullable NSDictionary<java.lang.String,​?> sourcePixelBufferAttributes)
        initWithAssetWriterInput:sourcePixelBufferAttributes: Creates a new pixel buffer adaptor to receive pixel buffers for writing to the output file. In order to take advantage of the improved efficiency of appending buffers created from the adaptor's pixel buffer pool, clients should specify pixel buffer attributes that most closely accommodate the source format of the video frames being appended. Pixel buffer attributes keys for the pixel buffer pool are defined in . 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. See the discussion under appendPixelBuffer:withPresentationTime: for advice on choosing a pixel format. Clients that do not need a pixel buffer pool for allocating buffers should set sourcePixelBufferAttributes to nil. This method throws an exception if the input is already attached to another asset writer input pixel buffer adaptor or if the input has already started writing (the asset writer has progressed beyond AVAssetWriterStatusUnknown).
        Parameters:
        input - An instance of AVAssetWriterInput to which the receiver should append pixel buffers. Currently, only asset writer inputs that accept media data of type AVMediaTypeVideo can be used to initialize a pixel buffer adaptor.
        sourcePixelBufferAttributes - Specifies the attributes of pixel buffers that will be vended by the input's CVPixelBufferPool.
        Returns:
        An instance of AVAssetWriterInputPixelBufferAdaptor.

      • pixelBufferPool

        @Nullable
public @Nullable CVPixelBufferPoolRef pixelBufferPool()
        [@property] pixelBufferPool A pixel buffer pool that will vend and efficiently recycle CVPixelBuffer objects that can be appended to the receiver. For maximum efficiency, clients should create CVPixelBuffer objects for appendPixelBuffer:withPresentationTime: by using this pool with the CVPixelBufferPoolCreatePixelBuffer() function. The value of this property will be NULL before -[AVAssetWriter startWriting] is called on the associated AVAssetWriter object. This property is key value observable. This property throws an exception if a pixel buffer pool cannot be created with this asset writer input pixel buffer adaptor's source pixel buffer attributes (must specify width, height, and either pixel format or pixel format description).

      • sourcePixelBufferAttributes

        @Nullable
public @Nullable NSDictionary<java.lang.String,​?> sourcePixelBufferAttributes()
        [@property] sourcePixelBufferAttributes The pixel buffer attributes of pixel buffers that will be vended by the receiver's CVPixelBufferPool. The value of this property is a dictionary containing pixel buffer attributes keys defined in .

      • useStoredAccessor

        @Deprecated
public static boolean useStoredAccessor()
        Deprecated.