Classes

A class that calculates replay gain

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@interface SFBReplayGainAnalyzer : NSObject

An input source

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@interface SFBInputSource : NSObject

Class supporting commonly-used audio metadata and attached pictures

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@interface SFBAudioMetadata : NSObject <NSCopying>

Class providing information on basic audio properties

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@interface SFBAudioProperties : NSObject <NSCopying>

An output source

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@interface SFBOutputSource : NSObject

An audio player wrapping an \c AVAudioEngine processing graph supplied by \c SFBAudioPlayerNode

\c SFBAudioPlayer supports gapless playback for audio with the same sample rate and number of channels. For audio with different sample rates or channels, the audio processing graph is automatically reconfigured.

An \c SFBAudioPlayer may be in one of three playback states: playing, paused, or stopped. These states are based on whether the underlying \c AVAudioEngine is running (\c SFBAudioPlayer.engineIsRunning) and the \c SFBAudioPlayerNode is playing (\c SFBAudioPlayer.playerNodeIsPlaying).

\c SFBAudioPlayer supports delegate-based callbacks for the following events:

1. Decoding started
2. Decoding complete
3. Decoding canceled
4. Rendering will start
5. Rendering started
6. Rendering complete
7. Now playing changed
8. Playback state changed
9. AVAudioEngineConfigurationChange notification received
10. End of audio
11. Asynchronous error encountered

The dispatch queue on which callbacks are performed is not specified.

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@interface SFBAudioPlayer : NSObject <SFBAudioPlayerNodeDelegate>

An \c AVAudioSourceNode supporting gapless playback for PCM formats

The output format of \c SFBAudioPlayerNode is specified at object initialization and cannot be changed. The output format must be the standard format, deinterleaved native-endian 32-bit floating point PCM, at any sample rate with any number of channels.

\c SFBAudioPlayerNode is supplied by objects implementing \c SFBPCMDecoding (decoders) and supports audio at the same sample rate and with the same number of channels as the output format. \c SFBAudioPlayerNode supports seeking when supported by the decoder.

\c SFBAudioPlayerNode maintains a current decoder and a queue of pending decoders. The current decoder is the decoder that will supply the earliest audio frame in the next render cycle when playing. Pending decoders are automatically dequeued and become current when the final frame of the current decoder is pushed in the render block.

\c SFBAudioPlayerNode decodes audio in a high priority (non-realtime) thread into a ring buffer and renders on demand. Rendering occurs in a realtime thread when the render block is called; the render block always supplies audio. When playback is paused or insufficient audio is available the render block outputs silence.

Since decoding and rendering are distinct operations performed in separate threads, a GCD timer on the background queue is used for garbage collection. This is necessary because state data created in the decoding thread needs to live until rendering is complete, which cannot occur until after decoding is complete.

\c SFBAudioPlayerNode supports delegate-based callbacks for the following events:

1. Decoding started
2. Decoding complete
3. Decoding canceled
4. Rendering will start
5. Rendering started
6. Rendering complete
7. End of audio

All callbacks are performed on a dedicated notification queue.

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@interface SFBAudioPlayerNode : AVAudioSourceNode

A class encapsulating a single attached picture.

Most file formats may have more than one attached picture of each type.

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@interface SFBAttachedPicture : NSObject <NSCopying>

An audio converter converts audio from one format to another through a PCM intermediate format.

An audio converter reads PCM audio from an audio decoder in the decoder’s processing format, converts that audio to an intermediate PCM format, and then writes the intermediate PCM audio to an audio encoder which performs the final conversion to the desired format.

The decoder’s processing format and intermediate format must both be PCM but do not have to have the same sample rate, bit depth, channel count, or channel layout.

AVAudioConverter is used to convert from the decoder’s processing format to the intermediate format, performing sample rate conversion and channel mapping as required.

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@interface SFBAudioConverter : NSObject

A decoder providing audio as PCM

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@interface SFBAudioDecoder : NSObject <SFBPCMDecoding>

An encoder consuming PCM audio

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@interface SFBAudioEncoder : NSObject <SFBPCMEncoding>

A class that exports audio using \c AVAudioFile

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@interface SFBAudioExporter : NSObject

An audio file containing properties (like channel count and sample rate) and metadata (like artist name and album title)

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@interface SFBAudioFile : NSObject

A decoder providing audio as DSD

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@interface SFBDSDDecoder : NSObject <SFBDSDDecoding>

A wrapper around a DSD decoder supporting DSD64 to PCM conversion

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@interface SFBDSDPCMDecoder : NSObject <SFBPCMDecoding>

A wrapper around a DSD decoder supporting DoP (DSD over PCM)

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@interface SFBDoPDecoder : NSObject <SFBPCMDecoding>

A class supporting a repeating segment of a decoder

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@interface SFBLoopableRegionDecoder : NSObject <SFBPCMDecoding>

A HAL audio aggregate device object

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public class AudioAggregateDevice : AudioDevice

A HAL audio box object

This class has a single scope (kAudioObjectPropertyScopeGlobal) and a single element (kAudioObjectPropertyElementMaster)

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public class AudioBox : AudioObject

A HAL audio clock device object

This class has a single scope (kAudioObjectPropertyScopeGlobal) and a single element (kAudioObjectPropertyElementMaster)

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public class AudioClockDevice : AudioObject

A HAL audio control object

This class has a single scope (kAudioObjectPropertyScopeGlobal) and a single element (kAudioObjectPropertyElementMaster)

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public class AudioControl : AudioObject

A HAL audio device object

This class has four scopes (kAudioObjectPropertyScopeGlobal, kAudioObjectPropertyScopeInput, kAudioObjectPropertyScopeOutput, and kAudioObjectPropertyScopePlayThrough), a master element (kAudioObjectPropertyElementMaster), and an element for each channel in each stream

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public class AudioDevice : AudioObject

A HAL audio endpoint

public class AudioEndpoint : AudioDevice

A HAL audio endpoint device

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public class AudioEndpointDevice : AudioDevice

A HAL audio object

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public class AudioObject : CustomDebugStringConvertible

extension AudioObject: Hashable

A HAL audio plug-in object

This class has a single scope (kAudioObjectPropertyScopeGlobal) and a single element (kAudioObjectPropertyElementMaster)

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public class AudioPlugIn : AudioObject

A HAL audio stream object

This class has a single scope (kAudioObjectPropertyScopeGlobal), a master element (kAudioObjectPropertyElementMaster), and an element for each channel

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public class AudioStream : AudioObject

A HAL audio subdevice

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public class AudioSubdevice : AudioDevice

The HAL audio system object

This class has a single scope (kAudioObjectPropertyScopeGlobal) and a single element (kAudioObjectPropertyElementMaster)

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public class AudioSystemObject : AudioObject

A HAL audio transport manager object

This class has a single scope (kAudioObjectPropertyScopeGlobal) and a single element (kAudioObjectPropertyElementMaster)

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public class AudioTransportManager : AudioPlugIn

A HAL audio boolean control object

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public class BooleanControl : AudioControl

A HAL audio mute control object

public class MuteControl : BooleanControl

A HAL audio solo control object

public class SoloControl : BooleanControl

A HAL audio jack control object

public class JackControl : BooleanControl

A HAL audio LFE mute control object

public class LFEMuteControl : BooleanControl

A HAL audio phantom power control object

public class PhantomPowerControl : BooleanControl

A HAL audio phase invert control object

public class PhaseInvertControl : BooleanControl

A HAL audio clip light control object

public class ClipLightControl : BooleanControl

A HAL audio talkback control object

public class TalkbackControl : BooleanControl

A HAL audio listenback control object

public class ListenbackControl : BooleanControl

A HAL audio level control object

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public class LevelControl : AudioControl

A HAL audio volume control object

public class VolumeControl : LevelControl

A HAL audio LFE volume control object

public class LFEVolumeControl : LevelControl

A HAL audio selector control object

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public class SelectorControl : AudioControl

A HAL audio data source control

public class DataSourceControl : SelectorControl

A HAL audio data destination control

public class DataDestinationControl : SelectorControl

A HAL audio clock source control

public class ClockSourceControl : SelectorControl

A HAL audio line level control

public class LineLevelControl : SelectorControl

A HAL audio high pass filter control

public class HighPassFilterControl : SelectorControl

A HAL audio slider control object

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public class SliderControl : AudioControl

A HAL audio stereo pan control object

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public class StereoPanControl : AudioControl