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76 changes: 76 additions & 0 deletions
76
app/src/main/kotlin/com/wire/android/media/audiomessage/AudioWavesMaskHelper.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| /* | ||
| * Wire | ||
| * Copyright (C) 2024 Wire Swiss GmbH | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see http://www.gnu.org/licenses/. | ||
| */ | ||
| package com.wire.android.media.audiomessage | ||
|
|
||
| import linc.com.amplituda.Amplituda | ||
| import linc.com.amplituda.Cache | ||
| import okio.Path | ||
| import java.io.File | ||
| import javax.inject.Inject | ||
| import kotlin.math.roundToInt | ||
|
|
||
| class AudioWavesMaskHelper @Inject constructor( | ||
| private val amplituda: Amplituda | ||
| ) { | ||
|
|
||
| companion object { | ||
| private const val WAVES_AMOUNT = 75 | ||
| private const val WAVE_MAX = 32 | ||
| } | ||
|
|
||
| fun getWaveMask(decodedAssetPath: Path): List<Int> = getWaveMask(File(decodedAssetPath.toString())) | ||
|
|
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| fun getWaveMask(file: File): List<Int> = amplituda | ||
| .processAudio(file, Cache.withParams(Cache.REUSE)) | ||
| .get() | ||
| .amplitudesAsList() | ||
| .averageWavesMask() | ||
| .equalizeWavesMask() | ||
|
|
||
| private fun List<Double>.equalizeWavesMask(): List<Int> { | ||
| if (this.isEmpty()) return listOf() | ||
|
|
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| val divider = max() / (WAVE_MAX - 1) | ||
| return map { (it / divider).roundToInt() + 1 } | ||
| } | ||
|
|
||
| private fun List<Int>.averageWavesMask(): List<Double> { | ||
| val wavesSize = size | ||
| val sectionSize = (wavesSize.toFloat() / WAVES_AMOUNT).roundToInt() | ||
|
|
||
| if (wavesSize < WAVES_AMOUNT || sectionSize == 1) return map { it.toDouble() } | ||
|
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| val averagedWaves = mutableListOf<Double>() | ||
| for (i in 0..<(wavesSize / sectionSize)) { | ||
| val startIndex = (i * sectionSize) | ||
| if (startIndex >= wavesSize) continue | ||
| val endIndex = (startIndex + sectionSize).coerceAtMost(wavesSize - 1) | ||
| averagedWaves.add(subList(startIndex, endIndex).averageInt()) | ||
| } | ||
| return averagedWaves | ||
| } | ||
|
|
||
| private fun List<Int>.averageInt(): Double { | ||
| if (isEmpty()) return 0.0 | ||
| return sum().toDouble() / size | ||
| } | ||
|
|
||
| fun clear() { | ||
| amplituda.clearCache() | ||
| } | ||
| } |
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