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| /* | ||
| * Copyright 2025 LiveKit | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import AVFoundation | ||
| @testable import LiveKit | ||
| import LiveKitWebRTC | ||
| import XCTest | ||
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| class AudioEngineTests: XCTestCase { | ||
| override class func setUp() { | ||
| LiveKitSDK.setLoggerStandardOutput() | ||
| RTCSetMinDebugLogLevel(.info) | ||
| } | ||
|
|
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| override func tearDown() async throws {} | ||
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| // Test if mic is authorized. Only works on device. | ||
| func testMicAuthorized() async { | ||
| let status = AVCaptureDevice.authorizationStatus(for: .audio) | ||
| if status != .authorized { | ||
| let result = await AVCaptureDevice.requestAccess(for: .audio) | ||
| XCTAssert(result) | ||
| } | ||
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| XCTAssert(status == .authorized) | ||
| } | ||
|
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| // Test start generating local audio buffer without joining to room. | ||
| func testPrejoinLocalAudioBuffer() async throws { | ||
| // Set up expectation... | ||
| let didReceiveAudioFrame = expectation(description: "Did receive audio frame") | ||
| didReceiveAudioFrame.assertForOverFulfill = false | ||
|
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| // Start watching for audio frame... | ||
| let audioFrameWatcher = AudioTrackWatcher(id: "notifier01") { _ in | ||
| didReceiveAudioFrame.fulfill() | ||
| } | ||
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| let localMicTrack = LocalAudioTrack.createTrack() | ||
| // Attach audio frame watcher... | ||
| localMicTrack.add(audioRenderer: audioFrameWatcher) | ||
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| Task.detached { | ||
| print("Starting audio track in 3 seconds...") | ||
| try? await Task.sleep(for: .seconds(3)) | ||
| AudioManager.shared.startRecording() | ||
| } | ||
|
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| // Wait for audio frame... | ||
| print("Waiting for first audio frame...") | ||
| await fulfillment(of: [didReceiveAudioFrame], timeout: 10) | ||
|
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| // Remove audio frame watcher... | ||
| localMicTrack.remove(audioRenderer: audioFrameWatcher) | ||
| } | ||
|
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| // Test the manual rendering mode (no-device mode) of AVAudioEngine based AudioDeviceModule. | ||
| // In manual rendering, no device access will be initialized such as mic and speaker. | ||
| func testManualRenderingMode() async throws { | ||
| // Attach sin wave generator when engine requests input node... | ||
| // inputMixerNode will automatically convert to RTC's internal format (int16). | ||
| // AVAudioEngine.attach() retains the node. | ||
| AudioManager.shared.onEngineWillConnectInput = { _, engine, inputMixerNode in | ||
| let sin = SineWaveSourceNode() | ||
| engine.attach(sin) | ||
| engine.connect(sin, to: inputMixerNode, format: nil) | ||
| } | ||
|
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| // Set manual rendering mode... | ||
| AudioManager.shared.isManualRenderingMode = true | ||
|
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| // Check if manual rendering mode is set... | ||
| let isManualRenderingMode = AudioManager.shared.isManualRenderingMode | ||
| print("manualRenderingMode: \(isManualRenderingMode)") | ||
| XCTAssert(isManualRenderingMode) | ||
|
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| // Start rendering... | ||
| AudioManager.shared.startRecording() | ||
|
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| // Render for 10 seconds... | ||
| try? await Task.sleep(for: .seconds(10)) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| /* | ||
| * Copyright 2025 LiveKit | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import AVFAudio | ||
|
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| class SineWaveSourceNode: AVAudioSourceNode { | ||
| private let sampleRate: Double | ||
| private let frequency: Double | ||
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| init(frequency: Double = 440.0, sampleRate: Double = 48000.0) { | ||
| self.frequency = frequency | ||
| self.sampleRate = sampleRate | ||
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| let format = AVAudioFormat(standardFormatWithSampleRate: sampleRate, channels: 1)! | ||
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| var currentPhase = 0.0 | ||
| let phaseIncrement = 2.0 * Double.pi * frequency / sampleRate | ||
|
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| let renderBlock: AVAudioSourceNodeRenderBlock = { _, _, frameCount, audioBufferList in | ||
| print("SineWaveSourceNode render block, frameCount: \(frameCount)") | ||
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| let ablPointer = UnsafeMutableAudioBufferListPointer(audioBufferList) | ||
| guard let ptr = ablPointer[0].mData?.assumingMemoryBound(to: Float.self) else { | ||
| return kAudioUnitErr_InvalidParameter | ||
| } | ||
|
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| // Generate sine wave samples | ||
| for frame in 0 ..< Int(frameCount) { | ||
| ptr[frame] = Float(sin(currentPhase)) | ||
|
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| // Update the phase | ||
| currentPhase += phaseIncrement | ||
|
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| // Keep phase in [0, 2π] to prevent floating point errors | ||
| if currentPhase >= 2.0 * Double.pi { | ||
| currentPhase -= 2.0 * Double.pi | ||
| } | ||
| } | ||
|
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| return noErr | ||
| } | ||
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| super.init(format: format, renderBlock: renderBlock) | ||
| } | ||
| } |