/*
	File:  VTDecompressionProperties.h
	
	Framework:  VideoToolbox
 
	Copyright © 2007-2023 Apple Inc. All rights reserved.
  
	Standard Video Toolbox decompression properties.
*/

#ifndef VTDECOMPRESSIONPROPERTIES_H
#define VTDECOMPRESSIONPROPERTIES_H

#include <CoreMedia/CMBase.h>
#include <VideoToolbox/VTBase.h>

#include <CoreFoundation/CoreFoundation.h>

#if defined(__cplusplus)
extern "C"
{
#endif
    
#pragma pack(push, 4)
	
CM_ASSUME_NONNULL_BEGIN

/*!
	@header
	@abstract
		Standard Video Toolbox decompression properties
		
	@discussion
		This file defines standard properties used to describe and configure decompression 
		operations managed by the video toolbox.  
		
		The video toolbox will provide direct support for some of these properties.
		Some properties are supported by individual decoders.
		
		Clients can query supported properties by calling VTSessionCopySupportedPropertyDictionary.
*/

#pragma mark Pixel buffer pools

// Standard properties regarding buffer recycling.  
// These are implemented by the video toolbox.

/*!
	@constant	kVTDecompressionPropertyKey_PixelBufferPool
	@abstract
		A pixel buffer pool for pixel buffers being output by the decompression session.
	@discussion
		This pixel buffer pool is always compatible with the client's pixel buffer attributes
		as specified when calling VTDecompressionSessionCreate.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_PixelBufferPool API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CVPixelBufferPool

/*!
	@constant	kVTDecompressionPropertyKey_PixelBufferPoolIsShared
	@abstract
		Indicates whether a common pixel buffer pool is shared between
		the video decoder and the session client. 
	@discussion
		This is false if separate pools are used because the pixel buffer attributes specified 
		by the video decoder and the client were incompatible.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_PixelBufferPoolIsShared API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CFBoolean

/*!
	@constant	kVTDecompressionPropertyKey_OutputPoolRequestedMinimumBufferCount
	@abstract
		Requests that the VTDecompressionSession use the value provided as a minimum buffer
		count for its output CVPixelBufferPool, not releasing buffers while the number in
		use is below this level.
	@discussion
		This property effectively requests that the kCVPixelBufferPoolMinimumBufferCountKey key
		be used for the creation of the output CVPixelBufferPool.
		
		For general playback cases, standard CVPixelBufferPool age-out behaviour should be 
		sufficient and this property should not be needed.  This property should only be used in 
		unusual playback scenarios where a peak pool level is known, and the potential 
		memory overhead is an acceptable tradeoff for avoiding possible buffer reallocation.
		
		Setting this property to NULL or passing in the value 0 will clear this setting and
		remove the minimum buffer count.
		
		Setting this property while a VTDecompressionSession is in use will result in the 
		creation of a new CVPixelBufferPool. This will cause new buffers to be allocated, and 
		existing buffers to be deallocated when they are released.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_OutputPoolRequestedMinimumBufferCount API_AVAILABLE(macos(10.9), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/Write, CFNumberRef

#pragma mark Asynchronous state

// Standard properties regarding asynchronous state.  
// These are implemented by the video toolbox.

/*!
	@constant	kVTDecompressionPropertyKey_NumberOfFramesBeingDecoded
	@abstract
		Returns the number of frames currently being decoded.
	@discussion
		This number may decrease asynchronously as frames are output.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_NumberOfFramesBeingDecoded API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CFNumber.

/*!
	@constant	kVTDecompressionPropertyKey_MinOutputPresentationTimeStampOfFramesBeingDecoded
	@abstract
		The minimum output presentation timestamp of the frames currently being decoded.
	@discussion
		This may change asynchronously as frames are output.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_MinOutputPresentationTimeStampOfFramesBeingDecoded API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CMTime as CFDictionary.

/*!
	@constant	kVTDecompressionPropertyKey_MaxOutputPresentationTimeStampOfFramesBeingDecoded
	@abstract
		The maximum output presentation timestamp of the frames currently being decoded.
	@discussion
		This may change asynchronously as frames are output.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_MaxOutputPresentationTimeStampOfFramesBeingDecoded API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CMTime as CFDictionary.
	
#pragma mark Content

// Standard properties describing content.
// Video decoders may optionally report these.

/*!
	@constant	kVTDecompressionPropertyKey_ContentHasInterframeDependencies
	@abstract
		Indicates whether the content being decoded has interframe dependencies, if the decoder knows.
	@discussion
		This is an optional property for video decoders to implement.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_ContentHasInterframeDependencies API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CFBoolean

#pragma mark Hardware acceleration

/*!
	@constant	kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
	@abstract
		If set to kCFBooleanTrue, the VideoToolbox will use a hardware accelerated video decoder if available.  If set to
		kCFBooleanFalse, hardware decode will never be used.
	@discussion
		This key is set in the decoderSpecification passed in to VTDecompressionSessionCreate.  Set it
		to kCFBooleanTrue to allow hardware accelerated decode.  To  prevent hardware decode,
		this property can be set to kCFBooleanFalse.
		In MacOS 10.15 and later, hardware decode is enabled in VTDecompressionSessions by default.
*/
VT_EXPORT const CFStringRef kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder API_AVAILABLE(macos(10.9), ios(17.0), tvos(17.0), visionos(1.0)) API_UNAVAILABLE(watchos); // CFBoolean, Optional, true by default

/*!
	@constant	kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
	@abstract
		If set to kCFBooleanTrue, the VideoToolbox will try to allocate a hardware accelerated decoder and
		return an error if that isn't possible.
		Setting this key automatically implies kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder --
		there is no need to set both and the Enable key does nothing if the Require key is set.
	@discussion
		This key is set in the decoderSpecification passed in to VTDecompressionSessionCreate.  Set it
		to kCFBooleanTrue to require hardware accelerated decode.  If hardware acceleration is not
		possible, the VTDecompressionSessionCreate call will fail.
		This key is useful for clients that have their own software decode implementation or
		those that may want to configure software and hardware decode sessions differently.
		Hardware acceleration may be unavailable for a number of reasons.  A few common cases are:
			- the machine does not have hardware acceleration capabilities
			- the requested decoding format or configuration is not supported
			- the hardware decode resources on the machine are busy
*/
VT_EXPORT const CFStringRef kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder API_AVAILABLE(macos(10.9), ios(17.0), tvos(17.0), visionos(1.0)) API_UNAVAILABLE(watchos); // CFBoolean, Optional

/*!
	@constant	kVTDecompressionPropertyKey_UsingHardwareAcceleratedVideoDecoder
	@abstract
		If set to kCFBooleanTrue, a hardware accelerated video decoder is being used.
	@discussion
		You can query this property using VTSessionCopyProperty after you have enabled hardware
		accelerated decode using kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
		to see if a hardware accelerated decoder was selected.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_UsingHardwareAcceleratedVideoDecoder API_AVAILABLE(macos(10.9), ios(17.0), tvos(17.0), visionos(1.0)) API_UNAVAILABLE(watchos); // CFBoolean, Read; assumed false by default
	
#pragma mark Decoder behavior

/*!
	@constant	kVTDecompressionPropertyKey_RealTime
	@abstract
		Hints the video decoder that decompression is, or is not, being performed in real time.
	@discussion
		For non-realtime decompression, clients may set this property to kCFBooleanFalse, which indicates that
		it is OK to run this decode pipeline at a lower priority than is used for realtime decode.
		By default, the VideoToolbox will treat the VTDecompressionSession as though it is being used for
		realtime playback.  Setting the property to NULL is equivalent to setting it to kCFBooleanTrue.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_RealTime API_AVAILABLE(macos(10.10), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFBoolean or NULL, Optional, default is true

/*!
	@constant	kVTDecompressionPropertyKey_MaximizePowerEfficiency
	@abstract
 		Hints to the video decoder that it should maximize power efficiency during decoding.
	@discussion
		For decompression where the client is operating in the background, clients may set this property to kCFBooleanTrue, which indicates that
		the decoder can take steps to minimize impact on power usage and other system activity.
		Setting the property to NULL is equivalent to setting it to kCFBooleanFalse.
 		Setting both kVTDecompressionPropertyKey_MaximizePowerEfficiency and kVTDecompressionPropertyKey_RealTime is unsupported and results in undefined behavior.
 		Not all video decoders may support this property
		By default, this property is NULL.
 */
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_MaximizePowerEfficiency API_AVAILABLE(macos(10.14), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFBoolean or NULL, Optional, default is false

/*!
	@constant	kVTDecompressionPropertyKey_ThreadCount
	@abstract
		Gets number of threads used by codec or suggests number of threads to use.
	@discussion
		This is an optional property for video decoders to implement.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_ThreadCount API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFNumber

// Standard properties about quality of service.
// By default, a decoder should completely decode every frame at full resolution.
// A decoder may support properties to modify the quality of service, using these keys and/or custom keys.

/*!
	@constant	kVTDecompressionPropertyKey_FieldMode
	@abstract
		Requests special handling of interlaced content.  
	@discussion
		This is an optional property for video decoders to implement.
		Decoders should only accept the modes that they will implement.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_FieldMode API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFString, one of
VT_EXPORT const CFStringRef kVTDecompressionProperty_FieldMode_BothFields API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);
VT_EXPORT const CFStringRef kVTDecompressionProperty_FieldMode_TopFieldOnly API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);
VT_EXPORT const CFStringRef kVTDecompressionProperty_FieldMode_BottomFieldOnly API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);
VT_EXPORT const CFStringRef kVTDecompressionProperty_FieldMode_SingleField API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);  // Most appropriate of either TopFieldOnly or BottomFieldOnly
VT_EXPORT const CFStringRef kVTDecompressionProperty_FieldMode_DeinterlaceFields API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);

/*!
	@constant	kVTDecompressionPropertyKey_DeinterlaceMode
	@abstract
		Requests a specific deinterlacing technique.  
	@discussion
		This is an optional property for video decoders to implement.
		Decoders should only accept the modes that they will implement.
		This property is only applicable if kVTDecompressionPropertyKey_FieldMode 
		is set to kVTDecompressionProperty_FieldMode_DeinterlaceFields.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_DeinterlaceMode API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);   // Read/write, CFString; only applicable if kVTDecompressionPropertyKey_FieldMode is kVTDecompressionProperty_FieldMode_DeinterlaceFields; supported values may include:
VT_EXPORT const CFStringRef kVTDecompressionProperty_DeinterlaceMode_VerticalFilter API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);   // apply 0.25-0.50-0.25 vertical filter to individual interlaced frames; default mode
VT_EXPORT const CFStringRef kVTDecompressionProperty_DeinterlaceMode_Temporal API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);	// apply filter that makes use of a window of multiple frames to generate deinterlaced results, and provides a better result at the expense of a pipeline delay; this mode is only used if kVTDecodeFrame_EnableTemporalProcessing is set, otherwise a non-temporal mode (eg, VerticalFilter) will be used instead

/*!
	@constant	kVTDecompressionPropertyKey_ReducedResolutionDecode
	@abstract
		Requests decoding at a smaller resolution than full-size.  
	@discussion
		This is an optional property for video decoders to implement.
		Decoders that only support a fixed set of resolutions should pick the smallest resolution 
		greater than or equal to the requested width x height.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_ReducedResolutionDecode API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFDictionary containing width and height keys and CFNumber values:
VT_EXPORT const CFStringRef kVTDecompressionResolutionKey_Width API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // CFNumber
VT_EXPORT const CFStringRef kVTDecompressionResolutionKey_Height API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // CFNumber

/*!
	@constant	kVTDecompressionPropertyKey_ReducedCoefficientDecode
	@abstract
		Requests approximation during decoding.  
	@discussion
		This is an optional property for video decoders to implement.
		Only decoders for which such approximations make sense should implement this property.
		The meaning of the number of coefficients will be decoder-specific.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_ReducedCoefficientDecode API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFNumber
	
	
/*!
	@constant	kVTDecompressionPropertyKey_ReducedFrameDelivery
	@abstract
		Requests frame dropping.
	@discussion
		This is an optional property for video decoders to implement.
		This number is a fraction between 0.0 and 1.0 that indicates what proportion of frames 
		should be delivered -- others may be dropped.  
		For example, 0.25 would indicate that only one frame in every 4 should be delivered.  
		This is a guideline; actual selection of frames is up to the decoder, which will know 
		which frames can be skipped without harm.
		If the decoder does not support this property directly, but reports that the content has 
		no interframe dependencies, the video toolbox may step in and perform simple frame dropping.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_ReducedFrameDelivery API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFNumber in range [0.0,1.0].

/*!
	@constant	kVTDecompressionPropertyKey_OnlyTheseFrames
	@abstract
		Requests that frames be filtered by type.  
	@discussion
		This is an optional property for video decoders to implement.
		If kVTDecompressionPropertyKey_ReducedFrameDelivery is supported and used in conjunction with 
		this property, the ReducedFrameDelivery is the proportion of the frames selected by this property: 
		0.25 and IFrames would indicate that only one I frame in every four should be delivered.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_OnlyTheseFrames API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFString, supported values may include:
VT_EXPORT const CFStringRef kVTDecompressionProperty_OnlyTheseFrames_AllFrames API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);
VT_EXPORT const CFStringRef kVTDecompressionProperty_OnlyTheseFrames_NonDroppableFrames API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);
VT_EXPORT const CFStringRef kVTDecompressionProperty_OnlyTheseFrames_IFrames API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);
VT_EXPORT const CFStringRef kVTDecompressionProperty_OnlyTheseFrames_KeyFrames API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos);
	
/*!
	@constant       kVTDecompressionProperty_TemporalLevelLimit
	@abstract
		Requests that frames be filtered by temporal level.
	@discussion
		This is an optional property for video decoders to implement.
		If kVTDecompressionProperty_TemporalLevelLimit is supported and the video track is
		an hierarchical encoding with temporal levels, this property requests that decoding
		be limited to the specified temporal level and lower.
		For more information on temporal levels, see kCMSampleAttachmentKey_HEVCTemporalLevelInfo
		in CoreMedia/CMSampleBuffer.h
*/
VT_EXPORT const CFStringRef kVTDecompressionProperty_TemporalLevelLimit API_AVAILABLE(macos(10.13), ios(11.0), tvos(10.4), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFNumber
	
/*!
	@constant	kVTDecompressionPropertyKey_SuggestedQualityOfServiceTiers
	@abstract
		Suggests how quality-of-service may be lowered in order to maintain realtime playback.
	@discussion
		This is an optional property for video decoders to implement.
		This property value is an array containing either CFDictionaries of property key/value pairs, or
		the array can contain special key values like kVTDecompressionProperty_TemporalLevelLimit.
		The first entry in the array should contain the set of properties that restore the
		default (full) quality of service; later entries should contain property sets with
		decreasing qualities of service.  Clients may work their way down these tiers until they are 
		able to keep up with the frame rate.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_SuggestedQualityOfServiceTiers API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CFArray of CFDictionaries containing property key/value pairs

/*!
	@constant	kVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByQuality
	@abstract
		Provides hints about quality tradeoffs between pixel formats.
	@discussion
		This is an optional property for video decoders to implement.
		This property value is an array containing CFNumbers holding CMPixelFormatType values,
		ordered by quality from best to worse.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByQuality API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CFArray[CFNumber(CMPixelFormatType)] ordered best to worst, optional

/*!
	@constant	kVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByPerformance
	@abstract
		Provides hints about speed tradeoffs between pixel formats.
	@discussion
		This is an optional property for video decoders to implement.
		This property value is an array containing CFNumbers holding CMPixelFormatType values,
		ordered by speed from fast to slow.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByPerformance API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CFArray[CFNumber(CMPixelFormatType)] ordered fast to slow, optional

/*!
	@constant	kVTDecompressionPropertyKey_PixelFormatsWithReducedResolutionSupport
	@abstract
		Indicates which pixel formats support reduced resolution decoding.
	@discussion
		This is an optional property for video decoders to implement.
		This property value is an array containing CFNumbers holding CMPixelFormatType values.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_PixelFormatsWithReducedResolutionSupport API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read-only, CFArray[CFNumber(CMPixelFormatType)], optional

/*!
	@constant	kVTDecompressionPropertyKey_AllowBitstreamToChangeFrameDimensions
	@abstract
		True if decoder is allowed to output buffers matching reduced frame dimensions in the bitstream rather than
		under-filling them.
	@discussion
		This is an optional property only supported by video decoders for bitstream formats which have a provision
		for specifying output dimensions per-frame, such as AV1.

		If a decoder does not support this property or if the property value is set to `kCFBooleanFalse`, all decoded
		frames will have the same dimensions as specified in the format description. In this case, if the bitstream
		changes the frame dimensions, the output buffer will be padded to the dimensions specified in the format
		description.

		When this property is set to `kCFBooleanTrue`, the decoder will set the dimensions of each output buffer to
		match the dimensions specified in the bitstream for that frame.

		In all cases, output buffer dimensions will never exceed the dimensions specified in the format description.

		In apps linked to SDK versions before this property was added, the AV1 decoder will behave as if this property
		is set to `kCFBooleanFalse`. Otherwise, value of this property defaults to `kCFBooleanTrue` where supported.
*/

VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_AllowBitstreamToChangeFrameDimensions API_AVAILABLE(macos(15.0), ios(18.0), tvos(18.0), visionos(2.0)) API_UNAVAILABLE(watchos); // Read/Write, CFBoolean, Optional

#pragma mark Post-decompression processing

// Standard properties about processing to be performed after decompression.
// These are implemented by the video toolbox.

/*!
	@constant	kVTDecompressionPropertyKey_PixelTransferProperties
	@abstract
		Requests particular pixel transfer features.  
	@discussion
		This property is implemented by the video toolbox.
		This property value is a CFDictionary containing properties from VTPixelTransferProperties.h.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_PixelTransferProperties API_AVAILABLE(macos(10.8), ios(8.0), tvos(10.2), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/Write, CFDictionary containing properties from VTPixelTransferProperties.h.

/*!
	@constant	kVTVideoDecoderSpecification_RequiredDecoderGPURegistryID
	@abstract
		If set, the VideoToolbox will only use a hardware decoder running on the GPU specified by the provided GPU registryID.
	@discussion
		This specification implies kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder.  A separate hardware decode opt-in is not required.
		The GPU registryID can be obtained from a MTLDevice using [MTLDevice registryID] or can be obtained from OpenGL or OpenCL.
		This option can only be used to specify a GPU registryID corresponding to a removable GPU (eGPU).
		If 0 is specified for the required GPU registryID, the VideoToolbox will not utilize removable GPUs for decode.
*/
VT_EXPORT const CFStringRef kVTVideoDecoderSpecification_RequiredDecoderGPURegistryID API_AVAILABLE(macos(10.13), ios(11.3), tvos(11.3), visionos(1.0)) API_UNAVAILABLE(watchos); // CFNumber, Optional

/*!
	@constant	kVTVideoDecoderSpecification_PreferredDecoderGPURegistryID
	@abstract
		If set, the VideoToolbox will try to use a hardware decoder running on the GPU specified by the provided GPU registryID.  If the
		GPU does not support decode of the specified format, the VideoToolbox will fall back to alternate decoders.
	@discussion
		This specification implies kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder.  A separate hardware decode opt-in is not required.
		If both kVTVideoDecoderSpecification_PreferredDecoderGPURegistryID and kVTVideoDecoderSpecification_RequiredDecoderGPURegistryID are
		set, kVTVideoDecoderSpecification_PreferredDecoderGPURegistryID will be ignored.
		This specification can be used in conjunction with kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder to prevent a fallback
		to software decode.
		The GPU registryID can be obtained from a MTLDevice using [MTLDevice registryID] or can be obtained from OpenGL or OpenCL.
		This option can only be used to specify a GPU registryID corresponding to a removable GPU (eGPU).
*/
VT_EXPORT const CFStringRef kVTVideoDecoderSpecification_PreferredDecoderGPURegistryID API_AVAILABLE(macos(10.13), ios(11.3), tvos(11.3), visionos(1.0)) API_UNAVAILABLE(watchos); // CFNumber, Optional

/*!
	@constant	kVTDecompressionPropertyKey_UsingGPURegistryID
	@abstract
		returns CFNumber indicating the gpu registryID of the decoder that was selected.  NULL indicates a built-in decoder or software decode was used.
	@discussion
		You can query this property using VTSessionCopyProperty after building a VTDecompressionSession to find out which GPU the decoder is using.
		If a decoder based on a built-in GPU was used it will return NULL.  If a software decoder is used, it will return NULL
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_UsingGPURegistryID API_AVAILABLE(macos(10.15), ios(13.0), tvos(13.0), visionos(1.0)) API_UNAVAILABLE(watchos); // CFNumberRef, Read

/*!
	@constant    kVTDecompressionPropertyKey_PropagatePerFrameHDRDisplayMetadata
	@abstract
		This controls whether or not to propagate any per frame HDR
		display metadata from the input compressed bitstream to the output pixel buffer.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_PropagatePerFrameHDRDisplayMetadata API_AVAILABLE(macos(11.0), ios(14.0), tvos(14.0), visionos(1.0)) API_UNAVAILABLE(watchos); // Read/write, CFBoolean, Optional, default is kCFBooleanTrue

/*!
	@constant       kVTDecompressionPropertyKey_GeneratePerFrameHDRDisplayMetadata
	@abstract
		Generates Per Frame HDR Metadata and attaches it to the resulting decoded CVPixelBuffers.
	@discussion
		If the color space and YCbCrMatrix matches a supported HDR format such as HLG (kCMFormatDescriptionTransferFunction_ITU_R_2100_HLG)
		the decoded frame will be analyzed and metadata will be added as an attachment to the CVPixelBuffer.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_GeneratePerFrameHDRDisplayMetadata API_AVAILABLE(macos(14.0), ios(17.0), tvos(17.0), visionos(1.0)) API_UNAVAILABLE(watchos); // CFBoolean, Read/Write, Optional, kCFBooleanFalse by default

/*!
	@constant       kVTDecompressionPropertyKey_DecoderProducesRAWOutput
	@abstract
		Indicates whether the decoder can produce RAW output requiring a VTRAWProcessingSession for post-decode processing.
	@discussion
		If this property is not implemented, it is assumed that the decoder does not produce RAW output.
		If the decoder reports that it produces RAW output the VTDecompressionSession will internally invoke a VTRAWProcessingSession by default to produce
		processed output.
		If the client sets kVTDecompressionPropertyKey_RequestRAWOutput, the VTDecompressionSession will do no processing and return the decoder's native RAW
		output, and any requested destinationImageBufferAttributes on the VTDecompressionSession will be ignored.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_DecoderProducesRAWOutput API_AVAILABLE(macos(15.0)) API_UNAVAILABLE(ios, tvos, watchos, visionos); // CFBoolean, Read, Optional

/*!
	@constant       kVTDecompressionPropertyKey_RequestRAWOutput
	@abstract
		For decoders which produce RAW output, this property requests that the VTDecompressionSession provide output which has not been processed.
	@discussion
		When a decoder produces RAW output (signalled by kVTDecompressionPropertyKey_DecoderProducesRAWOutput) the VTDecompressionSession will automatically
		invoke a VTRAWProcessingSession with default settings and emit processed frames by default, or when kVTDecompressionPropertyKey_RequestRAWOutput is set
		to kCFBooleanFalse.
		If a client wants to run a VTRAWProcessingSession on the RAW output themselves in order to control the post-decode processing of the decoded CVPixelBuffers,
		they must set kVTDecompressionPropertyKey_RequestRAWOutput to kCFBooleanTrue.
		If kVTDecompressionPropertyKey_RequestRAWOutput has been enabled and the decoder produces RAW output, the VTDecompressionSession 
		will return CVPixelBuffers in the decoder's native RAW format.  Any destinationImageBufferAttributes set on the VTDecompressionSession will be ignored.
*/
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_RequestRAWOutput API_AVAILABLE(macos(15.0)) API_UNAVAILABLE(ios, tvos, watchos, visionos); // CFBoolean, Read/Write, Optional, kCFBooleanFalse by default


#pragma mark Multi-image decompression

/*!
    @constant	kVTDecompressionPropertyKey_RequestedMVHEVCVideoLayerIDs
    @abstract
        Requests multi-image decoding of specific MV-HEVC VideoLayerIDs.
    @discussion
        MV-HEVC specific.
        Requires that the VTDecompressionSession client use VTDecompressionSessionSetMultiImageCallback to install a callback capable of receiving CMTaggedBufferGroups in response to multi-image DecodeFrame requests.
        The property value is a CFArray containing VideoLayerIDs as CFNumbers.
        MV-HEVC VideoLayerIDs not in this list do not need to be output, and the decoder may skip decoding them if not otherwise necessary.
        The property is NULL by default.
        If this property is NULL, MV-HEVC shall be decoded ignoring layers other than the base layer.
        Terminology note: in multi-image decompression, a single video sample (from one CMSampleBuffer) contains a single frame (with one PTS) that is decoded to produce multiple images.
 */
VT_EXPORT const CFStringRef kVTDecompressionPropertyKey_RequestedMVHEVCVideoLayerIDs API_AVAILABLE(macos(14.0), ios(17.0), visionos(1.0)) API_UNAVAILABLE(tvos, watchos); // Read/write, CFArray(CFNumber), Optional

	
CM_ASSUME_NONNULL_END

#pragma pack(pop)
    
#if defined(__cplusplus)
}
#endif

#endif // VTDECOMPRESSIONPROPERTIES_H