Add PCM 32 bits audio encoding support

Author: squti

android-wave-recorder/src/main/java/com/github/squti/androidwaverecorder/WaveConfig.kt

@@ -41,5 +41,6 @@ data class WaveConfig(
 internal fun bitPerSample(audioEncoding: Int) = when (audioEncoding) {
     AudioFormat.ENCODING_PCM_8BIT -> 8
     AudioFormat.ENCODING_PCM_16BIT -> 16
+    AudioFormat.ENCODING_PCM_32BIT -> 32
     else -> 16
 }

android-wave-recorder/src/main/java/com/github/squti/androidwaverecorder/WaveRecorder.kt

@@ -82,7 +82,7 @@ class WaveRecorder(private var filePath: String) {
     private var isPaused = false
     private lateinit var audioRecorder: AudioRecord
     private var noiseSuppressor: NoiseSuppressor? = null
-    private var channelModulus = 2
+    private var timeModulus = 1
 
 
     /**
@@ -103,8 +103,9 @@ class WaveRecorder(private var filePath: String) {
                     waveConfig.audioEncoding
                 )
             )
+            timeModulus = bitPerSample(waveConfig.audioEncoding) * waveConfig.sampleRate / 8
             if (waveConfig.channels == AudioFormat.CHANNEL_IN_STEREO)
-                channelModulus = 4
+                timeModulus *= 2
 
             audioSessionId = audioRecorder.audioSessionId
 
@@ -146,7 +147,7 @@ class WaveRecorder(private var filePath: String) {
                         it(calculateAmplitudeMax(data))
                     }
                     onTimeElapsed?.let {
-                        val audioLengthInSeconds: Long = file.length() / (channelModulus * waveConfig.sampleRate)
+                        val audioLengthInSeconds: Long = file.length() / timeModulus
                         it(audioLengthInSeconds)
                     }
                 }