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Make a voice turn stale-safe and actually observable #2

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Merged
NITISH-R-G merged 1 commit into from
Jul 26, 2026
Merged

Make a voice turn stale-safe and actually observable #2

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21 changes: 19 additions & 2 deletions app/src/main/java/com/screensaathi/sarvam/WavRecorder.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -23,9 +23,22 @@ class WavRecorder {
private val channel = AudioFormat.CHANNEL_IN_MONO
private val encoding = AudioFormat.ENCODING_PCM_16BIT

/** PCM payload bytes captured in the last take, excluding the 44-byte header. */
@Volatile
var bytesRecorded: Long = 0L
private set

/**
* Captured audio length in ms. The caller uses this to refuse to spend an
* STT round trip on a double-tapped mic that recorded nothing.
*/
val recordedMs: Long
get() = bytesRecorded * 1000 / (sampleRate * BYTES_PER_SAMPLE)

@SuppressLint("MissingPermission") // caller ensures RECORD_AUDIO is granted
fun start(outFile: File): Boolean {
if (recording) return false
bytesRecorded = 0L
val minBuf = AudioRecord.getMinBufferSize(sampleRate, channel, encoding)
if (minBuf <= 0) return false
val bufSize = minBuf * 2
Expand Down Expand Up @@ -67,6 +80,7 @@ class WavRecorder {
if (n > 0) {
raf.write(buf, 0, n)
total += n
bytesRecorded = total
}
}
// Patch sizes now that we know the payload length.
Expand All @@ -79,7 +93,7 @@ class WavRecorder {
}

private fun writeWavHeader(raf: RandomAccessFile, dataLen: Int) {
val byteRate = sampleRate * 2 // mono * 16-bit
val byteRate = sampleRate * BYTES_PER_SAMPLE // mono * 16-bit
val riffLen = 36 + dataLen
val header = ByteArray(44)
fun putStr(off: Int, s: String) { for (i in s.indices) header[off + i] = s[i].code.toByte() }
Expand All @@ -100,5 +114,8 @@ class WavRecorder {
raf.write(header)
}

companion object { private const val TAG = "WavRecorder" }
companion object {
private const val TAG = "WavRecorder"
private const val BYTES_PER_SAMPLE = 2
}
}
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