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whisper.android : support decode wav file has 2 channels (#972)

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geniusnut 2023-05-31 15:13:14 +08:00 committed by GitHub
parent d7c936b44a
commit ce6f747064
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1 changed files with 7 additions and 3 deletions
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10
examples/whisper.android/app/src/main/java/com/whispercppdemo/media/RiffWaveHelper.kt
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@ -10,12 +10,16 @@ fun decodeWaveFile(file: File): FloatArray {
file.inputStream().use { it.copyTo(baos) }
val buffer = ByteBuffer.wrap(baos.toByteArray())
buffer.order(ByteOrder.LITTLE_ENDIAN)
val channel = buffer.getShort(22).toInt()
buffer.position(44)
val shortBuffer = buffer.asShortBuffer()
val shortArray = ShortArray(shortBuffer.limit())
shortBuffer.get(shortArray)
return FloatArray(shortArray.size) { index ->
(shortArray[index] / 32767.0f).coerceIn(-1f..1f)
return FloatArray(shortArray.size / channel) { index ->
when (channel) {
1 -> (shortArray[index] / 32767.0f).coerceIn(-1f..1f)
else -> ((shortArray[2*index] + shortArray[2*index + 1])/ 32767.0f / 2.0f).coerceIn(-1f..1f)
}
}
}
@ -73,4 +77,4 @@ private fun headerBytes(totalLength: Int): ByteArray {
it.get(bytes)
return bytes
}
}
}