CustomAudioProcessingFactory.kt
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/*
* Copyright 2023-2024 LiveKit, Inc.
*
* 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.
*/
package io.livekit.android.webrtc
import io.livekit.android.audio.AudioProcessorInterface
import io.livekit.android.audio.AudioProcessorOptions
import io.livekit.android.audio.AuthedAudioProcessingController
import io.livekit.android.audio.authenticateProcessors
import livekit.org.webrtc.AudioProcessingFactory
import livekit.org.webrtc.ExternalAudioProcessingFactory
import java.nio.ByteBuffer
class CustomAudioProcessingFactory(private var audioProcessorOptions: AudioProcessorOptions) : AuthedAudioProcessingController {
private val externalAudioProcessor = ExternalAudioProcessingFactory()
init {
if (audioProcessorOptions.capturePostProcessor != null) {
setCapturePostProcessing(audioProcessorOptions.capturePostProcessor)
} else {
setCapturePostProcessing(null)
setBypassForCapturePostProcessing(false)
}
if (audioProcessorOptions.renderPreProcessor != null) {
setRenderPreProcessing(audioProcessorOptions.renderPreProcessor)
setBypassForRenderPreProcessing(audioProcessorOptions.renderPreBypass)
} else {
setRenderPreProcessing(null)
setBypassForRenderPreProcessing(false)
}
}
fun getAudioProcessingFactory(): AudioProcessingFactory {
return externalAudioProcessor
}
override fun authenticate(url: String, token: String) {
audioProcessorOptions.authenticateProcessors(url, token)
}
override fun setCapturePostProcessing(processing: AudioProcessorInterface?) {
audioProcessorOptions = audioProcessorOptions.copy(capturePostProcessor = processing)
externalAudioProcessor.setCapturePostProcessing(
processing.toAudioProcessing(),
)
}
override fun setBypassForCapturePostProcessing(bypass: Boolean) {
audioProcessorOptions = audioProcessorOptions.copy(capturePostBypass = bypass)
externalAudioProcessor.setBypassFlagForCapturePost(bypass)
}
override fun setRenderPreProcessing(processing: AudioProcessorInterface?) {
audioProcessorOptions = audioProcessorOptions.copy(renderPreProcessor = processing)
externalAudioProcessor.setRenderPreProcessing(
processing.toAudioProcessing(),
)
}
override fun setBypassForRenderPreProcessing(bypass: Boolean) {
audioProcessorOptions = audioProcessorOptions.copy(renderPreBypass = bypass)
externalAudioProcessor.setBypassFlagForRenderPre(bypass)
}
private class AudioProcessingBridge(
var audioProcessing: AudioProcessorInterface? = null,
) : ExternalAudioProcessingFactory.AudioProcessing {
override fun initialize(sampleRateHz: Int, numChannels: Int) {
audioProcessing?.initializeAudioProcessing(sampleRateHz, numChannels)
}
override fun reset(newRate: Int) {
audioProcessing?.resetAudioProcessing(newRate)
}
override fun process(numBands: Int, numFrames: Int, buffer: ByteBuffer?) {
audioProcessing?.processAudio(numBands, numFrames, buffer!!)
}
}
private fun AudioProcessorInterface?.toAudioProcessing(): ExternalAudioProcessingFactory.AudioProcessing {
return AudioProcessingBridge(this)
}
}