av_audio.h File Reference

Declarations for macOS audio capture with dual input paths. More...

import <AudioToolbox/AudioToolbox.h>
import <AVFoundation/AVFoundation.h>
import <CoreAudio/AudioHardwareTapping.h>
import <CoreAudio/CoreAudio.h>
#include "third-party/TPCircularBuffer/TPCircularBuffer.h"

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Classes
struct	AudioConverterInputData
	Data structure for AudioConverter input callback. Contains audio data and metadata needed for format conversion during audio processing. More...
class	AVAudio
	Core Audio capture class for macOS audio input and system-wide audio tapping. Provides functionality for both microphone capture via AVFoundation and system-wide audio capture via Core Audio taps (requires macOS 14.0+). More...
struct	AVAudioIOProcData
	IOProc client data structure for Core Audio system taps. Contains configuration and conversion data for real-time audio processing. More...

Functions
OSStatus	platf::audioConverterComplexInputProc (AudioConverterRef _Nullable inAudioConverter, UInt32 *_Nonnull ioNumberDataPackets, AudioBufferList *_Nonnull ioData, AudioStreamPacketDescription *_Nullable *_Nullable outDataPacketDescription, void *_Nonnull inUserData)
	Provide captured PCM frames to AudioConverter.
OSStatus	platf::systemAudioIOProc (AudioObjectID inDevice, const AudioTimeStamp *_Nullable inNow, const AudioBufferList *_Nullable inInputData, const AudioTimeStamp *_Nullable inInputTime, AudioBufferList *_Nullable outOutputData, const AudioTimeStamp *_Nullable inOutputTime, void *_Nullable inClientData)
	Receive system-audio tap samples from Core Audio.

Detailed Description

Declarations for macOS audio capture with dual input paths.

This header defines the AVAudio class which provides distinct audio capture methods:

1. Microphone capture - Uses AVFoundation framework to capture from specific microphone devices
2. System-wide audio tap - Uses Core Audio taps to capture all system audio output (macOS 14.0+)

The system-wide audio tap allows capturing audio from all applications and system sounds, while microphone capture focuses on input from physical or virtual microphone devices.

Function Documentation

audioConverterComplexInputProc()

OSStatus platf::audioConverterComplexInputProc	(	AudioConverterRef _Nullable	inAudioConverter,
		UInt32 *_Nonnull	ioNumberDataPackets,
		AudioBufferList *_Nonnull	ioData,
		AudioStreamPacketDescription *_Nullable *_Nullable	outDataPacketDescription,
		void *_Nonnull	inUserData )

Provide captured PCM frames to AudioConverter.

Parameters

inAudioConverter	In audio converter.
ioNumberDataPackets	Requested and returned packet count.
ioData	Buffer list filled with input audio.
outDataPacketDescription	Optional packet description output.
inUserData	AudioConverterInputData state used by the callback.

Returns

Core Audio status code from the callback.

systemAudioIOProc()

OSStatus platf::systemAudioIOProc	(	AudioObjectID	inDevice,
		const AudioTimeStamp *_Nullable	inNow,
		const AudioBufferList *_Nullable	inInputData,
		const AudioTimeStamp *_Nullable	inInputTime,
		AudioBufferList *_Nullable	outOutputData,
		const AudioTimeStamp *_Nullable	inOutputTime,
		void *_Nullable	inClientData )

Receive system-audio tap samples from Core Audio.

Parameters

inDevice	In device.
inNow	In now.
inInputData	In input data.
inInputTime	In input time.
outOutputData	Out output data.
inOutputTime	In output time.
inClientData	In client data.

Returns

Core Audio status code from the IO callback.