FMLiveSwitchCocoaAudioUnitSink Class Reference

Audio sink that writes decoded audio to the centralized AudioSessionManager mixer. More...

Instance Methods
(NSString *)	- label
	Gets the label/name of this audio sink implementation. More...
(bool)	- useVoiceProcessingIO
	Legacy property - always returns YES (VPIO always used via AudioSessionManager). More...
(void)	- setUseVoiceProcessingIO:
	Legacy setter - has no effect (VPIO configuration managed by AudioSessionManager). More...
(NSString *)	- audioSessionId
	Returns the unique identifier used to register this sink with AudioSessionManager. More...
Instance Methods inherited from FMLiveSwitchAudioSink
(FMLiveSwitchAudioConfig *)	- config
	Gets the input configuration. More...
(FMLiveSwitchIAudioOutputCollection *)	- createOutputCollectionWithInput:
	Creates an output collection. More...
(double)	- gain
	Gets a value indicating the gain (input amplification) of this sink. More...
(instancetype)	- init
	Initializes a new instance of the FMLiveSwitchAudioSink class. More...
(instancetype)	- initWithInputFormat:
	Initializes a new instance of the FMLiveSwitchAudioSink class. More...
(bool)	- processFrame:
	Processes a frame. More...
(void)	- setGain:
	Sets a value indicating the gain (input amplification) of this sink. More...
Instance Methods inherited from FMLiveSwitchMediaSink
(void)	- addInput:
	Adds an input. More...
(void)	- addInputs:
	Adds some inputs. More...
(void)	- addOnDisabledChange:
	Adds a handler that is raised when the Disabled property changes state. More...
(void)	- addOnPausedChange:
	Adds a handler that is raised when the Paused property changes state. More...
(void)	- addOnProcessControlFrameResponses:
	Adds a handler that is raised when control frame responses are processed. More...
(NSMutableArray *)	- addOnProcessControlFrameResponsesWithBlock
	Adds a handler that is raised when control frame responses are processed. More...
(void)	- addOnProcessControlFrameResponsesWithBlock:
	Adds a handler that is raised when control frame responses are processed. More...
(void)	- addOnProcessedControlFrameResponses:
	Adds a handler that is raised when control frame responses have been processed. More...
(NSMutableArray *)	- addOnProcessedControlFrameResponsesWithBlock
	Adds a handler that is raised when control frame responses have been processed. More...
(void)	- addOnProcessedControlFrameResponsesWithBlock:
	Adds a handler that is raised when control frame responses have been processed. More...
(void)	- addOnProcessedFrame:
	Adds a handler that is raised when a frame has been processed. More...
(TFrame)	- addOnProcessedFrameWithBlock
	Adds a handler that is raised when a frame has been processed. More...
(void)	- addOnProcessedFrameWithBlock:
	Adds a handler that is raised when a frame has been processed. More...
(void)	- addOnProcessFrame:
	Adds a handler that is raised when a frame is being processed. More...
(void)	- addOnProcessFrameException:
	Adds a handler that is raised when an exception is thrown while processing a frame. More...
(TFrame, NSException *)	- addOnProcessFrameExceptionWithBlock
	Adds a handler that is raised when an exception is thrown while processing a frame. More...
(void)	- addOnProcessFrameExceptionWithBlock:
	Adds a handler that is raised when an exception is thrown while processing a frame. More...
(TFrame)	- addOnProcessFrameWithBlock
	Adds a handler that is raised when a frame is being processed. More...
(void)	- addOnProcessFrameWithBlock:
	Adds a handler that is raised when a frame is being processed. More...
(void)	- addOnProcessFrameWithCaller:
	Adds a handler that is raised when a frame is being processed. More...
(id, TFrame)	- addOnProcessFrameWithCallerWithBlock
	Adds a handler that is raised when a frame is being processed. More...
(void)	- addOnProcessFrameWithCallerWithBlock:
	Adds a handler that is raised when a frame is being processed. More...
(void)	- addOnRaiseControlFrames:
	Adds a handler that is raised when control frames are raised. More...
(NSMutableArray *)	- addOnRaiseControlFramesWithBlock
	Adds a handler that is raised when control frames are raised. More...
(void)	- addOnRaiseControlFramesWithBlock:
	Adds a handler that is raised when control frames are raised. More...
(void)	- addOnRaisedControlFrames:
	Adds a handler that is raised when control frames have been raised. More...
(NSMutableArray *)	- addOnRaisedControlFramesWithBlock
	Adds a handler that is raised when control frames have been raised. More...
(void)	- addOnRaisedControlFramesWithBlock:
	Adds a handler that is raised when control frames have been raised. More...
(void)	- addOnStateChange:
	Adds a handler that is raised when the state changes. More...
(TSink)	- addOnStateChangeWithBlock
	Adds a handler that is raised when the state changes. More...
(void)	- addOnStateChangeWithBlock:
	Adds a handler that is raised when the state changes. More...
(bool)	- allowDiagnosticTimer
	Gets whether this media sink is allowed to be timed. More...
(bool)	- allowInputRateTimer
	Gets whether this media pipe input rate is allowed to be timed. More...
(FMLiveSwitchFuture< id > *)	- changeOutput:
	Changes the current output. More...
(NSString *)	- content
	Gets the content descriptor. More...
(TIOutputCollection)	- createOutputCollectionWithInput:
	Creates an output collection. More...
(bool)	- deactivated
	Gets a value indicating whether this sink is deactivated. More...
(NSString *)	- description
	Returns a string that represents this instance. More...
(bool)	- destroy
	Destroys this instance. More...
(bool)	- disabled
	Gets a value indicating whether this sink is disabled. More...
(void)	- doDestroy
	Destroys this instance. More...
(void)	- doPostProcessFrame:inputBuffer:
	Post-processes a frame. More...
(void)	- doPreProcessFrame:inputBuffer:
	Pre-processes a frame. More...
(void)	- doProcessControlFrameResponses:
	Processes control frame responses. More...
(void)	- doProcessFrame:inputBuffer:
	Processes a frame. More...
(FMLiveSwitchError *)	- doProcessSdpMediaDescription:isOffer:isLocalDescription:
	Processes a remote SDP media description. More...
(void)	- doProcessSinkStatsFromInputWithSinkStats:
	Processes sink stats from an input. More...
(void)	- doProcessTrackStatsFromInputWithTrackStats:
	Processes track stats from an input. More...
(int)	- getCcmSequenceNumber
	Gets the CCM sequence number. More...
(FMLiveSwitchFuture< NSMutableArray * > *)	- getOutputs
	Gets the available outputs. More...
(long long)	- getPipelineSystemDelayWithOutputFormat:
	Gets the total pipeline system delay in ticks for a given output format. More...
(bool)	- hasInput:
	Determines whether this pipe has the specified input. More...
(void)	- incrementCcmSequenceNumber
	Increments the CCM sequence number. More...
(instancetype)	- initWithInputFormat:
	Initializes a new instance of the FMLiveSwitchMediaSink`8 class. More...
(TIOutput)	- input
	Gets the input. More...
(void)	- inputAddedWithInput:
	Called when an input is added. More...
(bool)	- inputDeactivated
	Gets whether input is deactivated. More...
(TFormat)	- inputFormat
	Gets the input format. More...
(bool)	- inputMuted
	Gets whether input is muted. More...
(void)	- inputRemovedWithInput:
	Called when an input is removed. More...
(NSString *)	- inputRtpStreamId
	Gets the input RTP stream identifier. More...
(NSMutableArray *)	- inputs
	Gets the inputs. More...
(long long)	- inputSynchronizationSource
	Gets the input synchronization source. More...
(bool)	- isMixer
	Gets whether this sink processes media from different sources. More...
(int)	- maxInputBitrate
	Gets the maximum allowed input bitrate, in kbps. More...
(FMLiveSwitchEncodingInfo *)	- maxInputEncoding
	Gets the maximum allowed input encoding. More...
(int)	- minInputBitrate
	Gets the minimum allowed input bitrate, in kbps. More...
(FMLiveSwitchEncodingInfo *)	- minInputEncoding
	Gets the minimum allowed input encoding. More...
(bool)	- muted
	Gets whether input is muted. More...
(FMLiveSwitchSinkOutput *)	- output
	Gets the current output. More...
(bool)	- overConstrained
	Gets whether this sink is over-constrained. More...
(bool)	- overConstrainedBitrate
	Gets whether the sink bitrate is over-constrained. More...
(bool)	- overConstrainedInput
	Gets whether the input is over-contrained. More...
(bool)	- overConstrainedInputBitrate
	Gets whether the minimum allowed input bitrate exceeds the maximum allowed input bitrate. More...
(bool)	- paused
	Gets a value indicating whether this sink is paused. More...
(bool)	- persistent
	Gets a value indicating whether this instance is persistent. More...
(NSString *)	- pipelineJson
	Gets the pipeline JSON with this as the central point. More...
(NSString *)	- pipelineJsonFromInput
	Gets the pipeline JSON from an input. More...
(void)	- processControlFrameResponse:
	Processes a control frame response. More...
(void)	- processControlFrameResponses:
	Processes control frame responses. More...
(bool)	- processFrame:
	Processes a frame. More...
(FMLiveSwitchProcessFramePolicy)	- processFramePolicy
	Gets the ProcessFramePolicy for this media input. More...
(FMLiveSwitchError *)	- processSdpMediaDescriptionFromInputWithMediaDescription:isOffer:isLocalDescription:
	Processes a remote SDP media description from an output. More...
(void)	- processSinkStatsFromInputWithSinkStats:
	Processes sink stats from an input. More...
(void)	- processTrackStatsFromInputWithTrackStats:
	Processes track stats from an input. More...
(void)	- raiseControlFrame:
	Raises a control frame. More...
(void)	- raiseControlFrame:inputs:
	Raises a control frame. More...
(void)	- raiseControlFrames:
	Raises control frames. More...
(void)	- raiseControlFrames:inputs:
	Raises control frames. More...
(void)	- raiseDisabledChange
	Raises the OnDisabledChange event. More...
(bool)	- removeInput:
	Removes an input. More...
(void)	- removeInputs
	Removes all inputs. More...
(void)	- removeInputs:
	Removes some inputs. More...
(void)	- removeOnDisabledChange:
	Removes a handler that is raised when the Disabled property changes state. More...
(void)	- removeOnPausedChange:
	Removes a handler that is raised when the Paused property changes state. More...
(void)	- removeOnProcessControlFrameResponses:
	Removes a handler that is raised when control frame responses are processed. More...
(void)	- removeOnProcessedControlFrameResponses:
	Removes a handler that is raised when control frame responses have been processed. More...
(void)	- removeOnProcessedFrame:
	Removes a handler that is raised when a frame has been processed. More...
(void)	- removeOnProcessFrame:
	Removes a handler that is raised when a frame is being processed. More...
(void)	- removeOnProcessFrameException:
	Removes a handler that is raised when an exception is thrown while processing a frame. More...
(void)	- removeOnProcessFrameWithCaller:
	Removes a handler that is raised when a frame is being processed. More...
(void)	- removeOnRaiseControlFrames:
	Removes a handler that is raised when control frames are raised. More...
(void)	- removeOnRaisedControlFrames:
	Removes a handler that is raised when control frames have been raised. More...
(void)	- removeOnStateChange:
	Removes a handler that is raised when the state changes. More...
(void)	- setDeactivated:
	Sets a value indicating whether this sink is deactivated. More...
(void)	- setDisabled:
	Sets a value indicating whether this sink is disabled. More...
(void)	- setInput:
	Sets the input. More...
(void)	- setInputDeactivated:
	Sets whether input is deactivated. More...
(void)	- setInputMuted:
	Sets whether input is muted. More...
(void)	- setInputRtpStreamId:
	Sets the input RTP stream identifier. More...
(void)	- setInputs:
	Sets the inputs. More...
(void)	- setInputSynchronizationSource:
	Sets the input synchronization source. More...
(void)	- setMaxInputBitrate:
	Sets the maximum allowed input bitrate, in kbps. More...
(void)	- setMaxInputEncoding:
	Sets the maximum allowed input encoding. More...
(void)	- setMinInputBitrate:
	Sets the minimum allowed input bitrate, in kbps. More...
(void)	- setMinInputEncoding:
	Sets the minimum allowed input encoding. More...
(void)	- setMuted:
	Sets whether input is muted. More...
(void)	- setOutput:
	Sets the current output. More...
(void)	- setPersistent:
	Sets a value indicating whether this instance is persistent. More...
(void)	- setProcessFramePolicy:
	Sets the ProcessFramePolicy for this media input. More...
(void)	- setSystemDelay:
	Sets the system delay in ticks. More...
(FMLiveSwitchMediaSinkState)	- state
	Gets the state. More...
(long long)	- systemDelay
	Gets the system delay in ticks. More...
(bool)	- trySetInputFormatWithFrame:
	Sets the input format, if not set, using the frame's last buffer format. More...
(bool)	- updateDisabled
	Updates the disabled property. More...
Instance Methods inherited from <FMLiveSwitchIAudioOutput>
(void)	- setVolume:
	Sets a value indicating the volume (output resistance) of this source. More...
(double)	- volume
	Gets a value indicating the volume (output resistance) of this source. More...
Instance Methods inherited from <FMLiveSwitchIMediaOutput>
(void)	- addOnDisabledChange:
	Adds a handler that is raised when the Disabled property changes state. More...
(void)	- addOnDisabledChangeWithCaller:
	Adds a handler that is raised when the Disabled property changes state. More...
(id)	- addOnDisabledChangeWithCallerWithBlock
	Adds a handler that is raised when the Disabled property changes state. More...
(void)	- addOnDisabledChangeWithCallerWithBlock:
	Adds a handler that is raised when the Disabled property changes state. More...
(void)	- addOnPausedChange:
	Adds a handler that is raised when the Paused property changes state. More...
(void)	- addOnProcessControlFrames:
	Adds a handler that is raised when control frames are processed. More...
(NSMutableArray *)	- addOnProcessControlFramesWithBlock
	Adds a handler that is raised when control frames are processed. More...
(void)	- addOnProcessControlFramesWithBlock:
	Adds a handler that is raised when control frames are processed. More...
(void)	- addOnRaiseControlFrameResponses:
	Adds a handler that is raised when a control frame response is raised. More...
(NSMutableArray *)	- addOnRaiseControlFrameResponsesWithBlock
	Adds a handler that is raised when a control frame response is raised. More...
(void)	- addOnRaiseControlFrameResponsesWithBlock:
	Adds a handler that is raised when a control frame response is raised. More...
(void)	- addOnRaiseFrame:
	Adds a handler that is raised when a frame is raised. More...
(FMLiveSwitchMediaFrame *)	- addOnRaiseFrameWithBlock
	Adds a handler that is raised when a frame is raised. More...
(void)	- addOnRaiseFrameWithBlock:
	Adds a handler that is raised when a frame is raised. More...
(NSString *)	- content
	Gets the content descriptor. More...
(int)	- getCcmSequenceNumber
	Gets the CCM sequence number. More...
(long long)	- getPipelineSystemDelayWithOutputFormat:
	Gets the total pipeline system delay in ticks for a given media format. More...
(void)	- incrementCcmSequenceNumber
	Increments the CCM sequence number. More...
(int)	- maxOutputBitrate
	Gets the maximum allowed output bitrate, in kbps. More...
(FMLiveSwitchEncodingInfo *)	- maxOutputEncoding
	Gets the maximum allowed output encoding. More...
(int)	- minOutputBitrate
	Gets the minimum allowed output bitrate, in kbps. More...
(FMLiveSwitchEncodingInfo *)	- minOutputEncoding
	Gets the minimum allowed output encoding. More...
(bool)	- outputDeactivated
	Gets whether output is deactivated. More...
(bool)	- outputMuted
	Gets whether output is muted. More...
(NSString *)	- outputRtpStreamId
	Gets the output RTP stream identifier. More...
(bool)	- outputSynchronizable
	Gets whether output is synchronizable. More...
(long long)	- outputSynchronizationSource
	Gets the output synchronization source. More...
(void)	- processControlFrames:
	Processes control frames. More...
(FMLiveSwitchError *)	- processSdpMediaDescriptionFromOutputWithMediaDescription:isOffer:isLocalDescription:
	Processes a local SDP media description from an output. More...
(void)	- processSourceStatsFromOutputWithSourceStats:
	Processes source stats from an output. More...
(void)	- processTrackStatsFromOutputWithTrackStats:
	Processes track stats from an output. More...
(void)	- removeOnDisabledChange:
	Removes a handler that is raised when the Disabled property changes state. More...
(void)	- removeOnDisabledChangeWithCaller:
	Removes a handler that is raised when the Disabled property changes state. More...
(void)	- removeOnPausedChange:
	Removes a handler that is raised when the Paused property changes state. More...
(void)	- removeOnProcessControlFrames:
	Removes a handler that is raised when control frames are processed. More...
(void)	- removeOnRaiseControlFrameResponses:
	Removes a handler that is raised when a control frame response is raised. More...
(void)	- removeOnRaiseFrame:
	Removes a handler that is raised when a frame is raised. More...
(long long)	- systemDelay
	Gets the system delay in ticks. More...
(int)	- targetOutputBitrate
	Gets the target output bitrate, in kbps. More...
(FMLiveSwitchEncodingInfo *)	- targetOutputEncoding
	Gets the target output encoding. More...
Instance Methods inherited from <FMLiveSwitchIOutput>
(void)	- addOutput:
	Adds an output. More...
(void)	- addOutputs:
	Adds some outputs. More...
(NSObject< FMLiveSwitchIInput > *)	- output
	Gets the output. More...
(FMLiveSwitchMediaFormat *)	- outputFormat
	Gets the output format. More...
(NSMutableArray *)	- outputs
	Gets the outputs. More...
(NSString *)	- pipelineJsonFromOutput
	Gets the pipeline JSON from an output. More...
(bool)	- removeOutput:
	Removes an output. More...
(void)	- removeOutputs
	Removes all outputs. More...
(void)	- removeOutputs:
	Removes some outputs. More...
Instance Methods inherited from <FMLiveSwitchIElement>
(NSString *)	- externalId
	Gets the external identifier. More...
(NSString *)	- id
	Gets the identifier. More...
(NSString *)	- pipelineJson
	Gets the pipeline JSON with this as the central point. More...
(void)	- setExternalId:
	Sets the external identifier. More...
Instance Methods inherited from <FMLiveSwitchIMediaElement>
(bool)	- deactivated
	Gets a value indicating whether this instance is deactivated. More...
(bool)	- destroy
	Destroys this instance. More...
(bool)	- disabled
	Gets a value indicating whether this instance is disabled. More...
(bool)	- muted
	Gets a value indicating whether this instance is muted. More...
(bool)	- paused
	Gets a value indicating whether this instance is paused. More...
(bool)	- persistent
	Gets a value indicating whether this instance is persistent. More...
(void)	- setDeactivated:
	Sets a value indicating whether this instance is deactivated. More...
(void)	- setMuted:
	Sets a value indicating whether this instance is muted. More...

Class Methods
(instancetype)	+ audioUnitSinkWithConfig:
	Creates an audio sink with the specified audio configuration. More...
(instancetype)	+ audioUnitSinkWithInput:
	Creates an audio sink with a single input. More...
(instancetype)	+ audioUnitSinkWithInputs:
	Creates an audio sink with multiple inputs. More...
Class Methods inherited from FMLiveSwitchAudioSink
(FMLiveSwitchAudioSink *)	+ audioSink
	Initializes a new instance of the FMLiveSwitchAudioSink class. More...
(FMLiveSwitchAudioSink *)	+ audioSinkWithInputFormat:
	Initializes a new instance of the FMLiveSwitchAudioSink class. More...
Class Methods inherited from FMLiveSwitchMediaSink
(FMLiveSwitchMediaSink *)	+ mediaSink
	Initializes a new instance of the FMLiveSwitchMediaSink`8 class. More...
(FMLiveSwitchMediaSink *)	+ mediaSinkWithInputFormat:
	Initializes a new instance of the FMLiveSwitchMediaSink`8 class. More...

Additional Inherited Members
Protected Attributes inherited from FMLiveSwitchMediaSink
	__pad0__: FMLiveSwitchMediaSinkBase<FMLiveSwitchIMediaInput
	FMLiveSwitchIInput
	FMLiveSwitchIMediaElement

Detailed Description

Audio sink that writes decoded audio to the centralized AudioSessionManager mixer.

@discussion This sink receives decoded audio frames from IceLink and writes them to the AudioSessionManager's mixing buffer. The AudioSessionManager combines audio from all active sinks and plays the mixed output through its shared VPIO AudioUnit.

Key Architectural Points:

• Does NOT own an AudioUnit (AudioSessionManager owns the shared VPIO)
• Does NOT have a render callback (AudioSessionManager handles rendering)
• Does NOT manage circular buffers (AudioSessionManager handles mixing buffers)
• Simply writes decoded audio data to AudioSessionManager's mixer

Lifecycle:

1. Created when a RemoteMedia is instantiated
2. Registers with AudioSessionManager on initialization (doInitialize)
3. Writes audio frames to mixer in doProcessFrame
4. Unregisters from AudioSessionManager on destruction (doDestroy)

Audio Flow:

IceLink → RemoteMedia → AudioUnitSink.doProcessFrame() →
AudioSessionManager.writeSpeakerData() → Mixer Buffer →
VPIO Output Callback → Speaker

Multiple Sinks:

• Multiple AudioUnitSinks can coexist (one per remote participant)
• AudioSessionManager mixes all sink outputs together
• Each sink has its own circular buffer in the mixer
• Mixing uses simple addition with clipping to prevent distortion

Thread Safety:

• doInitialize/doDestroy called on main thread
• doProcessFrame called on media decode thread
• AudioSessionManager handles thread-safe mixing

Comparison to Traditional Approach:

OLD (Per-Sink AudioUnit):

• Each sink creates its own AudioUnit
• Only one sink can actually play (speaker conflict)
• Volume issues, no echo cancellation

NEW (Centralized Mixer):

• All sinks write to shared mixer
• AudioSessionManager plays mixed output
• Full volume, proper echo cancellation

Usage:

// Created automatically by RemoteMedia
FMLiveSwitchAudioConfig *config = [FMLiveSwitchAudioConfig audioConfigWithClockRate:48000];
FMLiveSwitchCocoaAudioUnitSink *sink = [FMLiveSwitchCocoaAudioUnitSink audioUnitSinkWithConfig:config];
[remoteMedia setAudioSink:sink];

Method Documentation

audioSessionId

- (NSString *) audioSessionId

Returns the unique identifier used to register this sink with AudioSessionManager.

Returns

The GUID string that was passed to AudioSessionManager at sink registration time. This is the same value stored in the telemetry snapshot under sinkMediaId.

@discussion Used by the telemetry layer to correlate this sink with its remote RTP SSRC (see FMLiveSwitchCocoaServerConnectionTelemetry).

audioUnitSinkWithConfig:

+ (instancetype) audioUnitSinkWithConfig:

(FMLiveSwitchAudioConfig *)

config

Creates an audio sink with the specified audio configuration.

Parameters

config

The audio configuration (sample rate, channel count, etc.).

Returns

A new AudioUnitSink instance.

@discussion This creates a sink configured for the given audio format. The sink will register with AudioSessionManager when initialized.

Typical configurations:

• VoIP: 48kHz, 1 channel (mono), 16-bit PCM
• High-quality: 48kHz, 2 channels (stereo), 16-bit PCM

The configuration should match the audio being received from IceLink.

Example:

FMLiveSwitchAudioConfig *config = [FMLiveSwitchAudioConfig audioConfigWithClockRate:48000];
config.channelCount = 1;
FMLiveSwitchCocoaAudioUnitSink *sink = [FMLiveSwitchCocoaAudioUnitSink audioUnitSinkWithConfig:config];

audioUnitSinkWithInput:

+ (instancetype) audioUnitSinkWithInput:

(NSObject<FMLiveSwitchIAudioOutput> *)

input

Creates an audio sink with a single input.

Parameters

input

The audio output to connect as input (typically from decoder).

Returns

A new AudioUnitSink instance with the input already connected.

@discussion This convenience method creates a sink and connects an input in one step. The configuration is derived from the input's audio format.

Example:

// audioOutput is typically an audio decoder
FMLiveSwitchCocoaAudioUnitSink *sink = [FMLiveSwitchCocoaAudioUnitSink audioUnitSinkWithInput:audioOutput];

audioUnitSinkWithInputs:

+ (instancetype) audioUnitSinkWithInputs:

(NSMutableArray *)

inputs

Creates an audio sink with multiple inputs.

Parameters

inputs

Array of audio outputs to connect as inputs.

Returns

A new AudioUnitSink instance with all inputs connected.

@discussion This creates a sink with multiple audio inputs that will be mixed together. All inputs must have the same audio format (sample rate, channels, etc.).

Example:

NSMutableArray *inputs = [NSMutableArray arrayWithObjects:decoder1, decoder2, nil];
FMLiveSwitchCocoaAudioUnitSink *sink = [FMLiveSwitchCocoaAudioUnitSink audioUnitSinkWithInputs:inputs];

label

- (NSString *) label

Gets the label/name of this audio sink implementation.

Returns

A string identifying this sink (e.g., "iOS AudioUnit Sink (Centralized VPIO)").

@discussion The label varies by platform:

• iOS: "iOS AudioUnit Sink (Centralized VPIO)"
• tvOS: "tvOS AudioUnit Sink (Centralized VPIO)"
• macOS: "macOS AudioUnit Sink (Centralized VPIO)"

This is primarily used for logging and debugging.

Implements FMLiveSwitchMediaSink.

setUseVoiceProcessingIO:

- (void) setUseVoiceProcessingIO:

(bool)

useVoiceProcessingIO

Legacy setter - has no effect (VPIO configuration managed by AudioSessionManager).

Parameters

useVoiceProcessingIO

Ignored parameter.

@discussion This setter is maintained for API compatibility but has no effect. To configure VPIO vs RemoteIO, use:

[[FMLiveSwitchCocoaAudioSessionManager sharedInstance] setUseVoiceProcessingIO:YES];

Deprecated:

Use AudioSessionManager configuration instead.

useVoiceProcessingIO

- (bool) useVoiceProcessingIO

Legacy property - always returns YES (VPIO always used via AudioSessionManager).

Returns

YES

@discussion This property is maintained for API compatibility but has no effect. The sink always uses the shared VPIO from AudioSessionManager. To configure VPIO vs RemoteIO, use AudioSessionManager.useVoiceProcessingIO instead.

Deprecated:

Use AudioSessionManager configuration instead.