MixerAudioBufferCallbackTest.kt
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/*
* Copyright 2024-2025 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.audio
import android.media.AudioFormat
import org.junit.Assert.assertEquals
import org.junit.Test
import java.nio.ByteBuffer
import java.nio.ByteOrder
class MixerAudioBufferCallbackTest {
@Test
fun mixesByte() {
val mixer = IncrementMixer()
val buffer = ByteBuffer.allocateDirect(1).order(ByteOrder.nativeOrder())
buffer.put(0, 0.toByte())
mixer.onBuffer(
buffer = buffer,
audioFormat = AudioFormat.ENCODING_PCM_8BIT,
channelCount = 1,
sampleRate = 1,
bytesRead = 1,
captureTimeNs = 0,
)
assertEquals((0 + INCREMENT).toByte(), buffer.get(0))
}
@Test
fun mixesShort() {
val mixer = IncrementMixer()
val buffer = ByteBuffer.allocateDirect(2).order(ByteOrder.nativeOrder())
val shortBuffer = buffer.asShortBuffer()
shortBuffer.put(0, 0.toShort())
mixer.onBuffer(
buffer = buffer,
audioFormat = AudioFormat.ENCODING_PCM_16BIT,
channelCount = 1,
sampleRate = 1,
bytesRead = 2,
captureTimeNs = 0,
)
assertEquals((0 + INCREMENT).toShort(), shortBuffer.get(0))
}
@Test
fun mixesFloat() {
val mixer = IncrementMixer()
val buffer = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder())
val floatBuffer = buffer.asFloatBuffer()
floatBuffer.put(0, 0.toFloat())
mixer.onBuffer(
buffer = buffer,
audioFormat = AudioFormat.ENCODING_PCM_FLOAT,
channelCount = 1,
sampleRate = 1,
bytesRead = 1,
captureTimeNs = 0,
)
assertEquals((0 + INCREMENT).toFloat(), floatBuffer.get(0))
}
companion object {
const val INCREMENT = 1
}
class IncrementMixer : MixerAudioBufferCallback() {
override fun onBufferRequest(originalBuffer: ByteBuffer, audioFormat: Int, channelCount: Int, sampleRate: Int, bytesRead: Int, captureTimeNs: Long): BufferResponse? {
val byteBuffer = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder())
when (audioFormat) {
AudioFormat.ENCODING_PCM_8BIT -> {
byteBuffer.put(0, INCREMENT.toByte())
}
AudioFormat.ENCODING_PCM_16BIT -> {
byteBuffer.asShortBuffer().put(0, INCREMENT.toShort())
}
AudioFormat.ENCODING_PCM_FLOAT -> {
byteBuffer.asFloatBuffer().put(0, INCREMENT.toFloat())
}
else -> throw IllegalArgumentException("Bad audio format $audioFormat")
}
return BufferResponse(byteBuffer)
}
}
}
private fun getBytesPerSample(audioFormat: Int): Int {
return when (audioFormat) {
AudioFormat.ENCODING_PCM_8BIT -> 1
AudioFormat.ENCODING_PCM_16BIT, AudioFormat.ENCODING_IEC61937, AudioFormat.ENCODING_DEFAULT -> 2
AudioFormat.ENCODING_PCM_FLOAT -> 4
else -> throw IllegalArgumentException("Bad audio format $audioFormat")
}
}