Hi,
I am using AudioQueue (for code sharing reasons between macOS and iOS) to
record user voice.
Here is the code snippet I use to configure and start the recording:
init() {
var formatFlags = AudioFormatFlags()
formatFlags |= kLinearPCMFormatFlagIsSignedInteger
formatFlags |= kLinearPCMFormatFlagIsPacked
p_audioDataFormat = AudioStreamBasicDescription(
mSampleRate: 16000.0,
mFormatID: kAudioFormatLinearPCM,
mFormatFlags: formatFlags,
mBytesPerPacket: UInt32(1*MemoryLayout<Int16>.stride),
mFramesPerPacket: 1,
mBytesPerFrame: UInt32(1*MemoryLayout<Int16>.stride),
mChannelsPerFrame: 1,
mBitsPerChannel: 16,
mReserved: 0
)
}
private let p_audioInputCallback:AudioQueueInputCallback = {
inUserData, inQueue, inBuffer, inStartTime, inNumPackets, inPacketDesc
in
guard let userData = inUserData else { return }
let me =
Unmanaged<SnipsService>.fromOpaque(userData).takeUnretainedValue()
let buffer = inBuffer.pointee
let int16Buffer = buffer.mAudioData.bindMemory(to: Int16.self,
capacity: Int(buffer.mAudioDataByteSize) / MemoryLayout<Int16>.size)
var samples = Array(UnsafeBufferPointer(start: int16Buffer, count:
Int(buffer.mAudioDataByteSize) / MemoryLayout<Int16>.size))
try! me.snips?.appendBuffer(samples) // Do something with samples
// buffer is available again
AudioQueueEnqueueBuffer(inQueue, inBuffer, 0, nil)
}
private func startRecording() throws {
let selfPointer =
UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque())
var status = AudioQueueNewInput(&p_audioDataFormat,
p_audioInputCallback, selfPointer, nil, nil, 0, &p_audioQueue)
if status == 0 {
guard let queue = p_audioQueue else { return }
// allocate and enqueue buffers
let numBuffers = 4
let bufferSize = UInt32(1024 * MemoryLayout<Int16>.size)
for _ in 0..<numBuffers {
let bufferRef =
UnsafeMutablePointer<AudioQueueBufferRef?>.allocate(capacity: 1)
AudioQueueAllocateBuffer(queue, bufferSize, bufferRef)
if let buffer = bufferRef.pointee {
AudioQueueEnqueueBuffer(queue, buffer, 0, nil)
}
}
AudioQueueStart(queue, nil)
}
}
Everything work perfectly, the audioInputCallback is called repeatedly until I
start playing music with MediaPlayer API.
At this time, the callback is no longer called.
If I stop the music, it works again.
Is there a special settings, a bit like the .playAndRecord category for
AVAudioSession but for AudioQueue?
Thanks a lot
Sébastien
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