added option to change audio format

app/src/main/java/xdsopl/robot36/MainActivity.java

@@ -71,6 +71,7 @@ public class MainActivity extends AppCompatActivity {
 	private PixelBuffer peakMeterBuffer;
 	private ImageView peakMeterView;
 	private PixelBuffer imageBuffer;
+	private short[] shortBuffer;
 	private float[] recordBuffer;
 	private AudioRecord audioRecord;
 	private Decoder decoder;
@@ -80,6 +81,7 @@ public class MainActivity extends AppCompatActivity {
 	private int recordRate;
 	private int recordChannel;
 	private int audioSource;
+	private int audioFormat;
 	private int fgColor;
 	private int thinColor;
 	private int tintColor;
@@ -126,7 +128,13 @@ public class MainActivity extends AppCompatActivity {
 
 		@Override
 		public void onPeriodicNotification(AudioRecord audioRecord) {
-			audioRecord.read(recordBuffer, 0, recordBuffer.length, AudioRecord.READ_BLOCKING);
+			if (shortBuffer == null) {
+				audioRecord.read(recordBuffer, 0, recordBuffer.length, AudioRecord.READ_BLOCKING);
+			} else {
+				audioRecord.read(shortBuffer, 0, shortBuffer.length, AudioRecord.READ_BLOCKING);
+				for (int i = 0; i < shortBuffer.length; ++i)
+					recordBuffer[i] = .000030517578125f * shortBuffer[i];
+			}
 			processPeakMeter();
 			boolean newLines = decoder.process(recordBuffer, recordChannel);
 			processFreqPlot();
@@ -199,7 +207,8 @@ public class MainActivity extends AppCompatActivity {
 			rateChanged = audioRecord.getSampleRate() != recordRate;
 			boolean channelChanged = audioRecord.getChannelCount() != (recordChannel == 0 ? 1 : 2);
 			boolean sourceChanged = audioRecord.getAudioSource() != audioSource;
-			if (!rateChanged && !channelChanged && !sourceChanged)
+			boolean formatChanged = audioRecord.getAudioFormat() != audioFormat;
+			if (!rateChanged && !channelChanged && !sourceChanged && !formatChanged)
 				return;
 			stopListening();
 			audioRecord.release();
@@ -211,13 +220,14 @@ public class MainActivity extends AppCompatActivity {
 			channelCount = 2;
 			channelConfig = AudioFormat.CHANNEL_IN_STEREO;
 		}
-		int sampleSize = 4;
+		int sampleSize = audioFormat == AudioFormat.ENCODING_PCM_FLOAT ? 4 : 2;
 		int frameSize = sampleSize * channelCount;
-		int audioFormat = AudioFormat.ENCODING_PCM_FLOAT;
 		int readsPerSecond = 50;
 		int bufferSize = Integer.highestOneBit(recordRate) * frameSize;
 		int frameCount = recordRate / readsPerSecond;
-		recordBuffer = new float[frameCount * channelCount];
+		int bufferCount = frameCount * channelCount;
+		recordBuffer = new float[bufferCount];
+		shortBuffer = audioFormat == AudioFormat.ENCODING_PCM_FLOAT ? null : new short[bufferCount];
 		try {
 			audioRecord = new AudioRecord(audioSource, recordRate, channelConfig, audioFormat, bufferSize);
 			if (audioRecord.getState() == AudioRecord.STATE_INITIALIZED) {
@@ -244,7 +254,10 @@ public class MainActivity extends AppCompatActivity {
 		if (audioRecord != null) {
 			audioRecord.startRecording();
 			if (audioRecord.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING) {
-				audioRecord.read(recordBuffer, 0, recordBuffer.length, AudioRecord.READ_BLOCKING);
+				if (shortBuffer == null)
+					audioRecord.read(recordBuffer, 0, recordBuffer.length, AudioRecord.READ_BLOCKING);
+				else
+					audioRecord.read(shortBuffer, 0, recordBuffer.length, AudioRecord.READ_BLOCKING);
 				setStatus(R.string.listening);
 			} else {
 				setStatus(R.string.audio_recording_error);
@@ -281,6 +294,14 @@ public class MainActivity extends AppCompatActivity {
 		initAudioRecord();
 	}
 
+	private void setAudioFormat(int newAudioFormat) {
+		if (audioFormat == newAudioFormat)
+			return;
+		audioFormat = newAudioFormat;
+		updateAudioFormatMenu();
+		initAudioRecord();
+	}
+
 	private void updateRecordRateMenu() {
 		switch (recordRate) {
 			case 8000:
@@ -341,6 +362,10 @@ public class MainActivity extends AppCompatActivity {
 		}
 	}
 
+	private void updateAudioFormatMenu() {
+		menu.findItem(audioFormat == AudioFormat.ENCODING_PCM_FLOAT ? R.id.action_set_floating_point : R.id.action_set_fixed_point).setChecked(true);
+	}
+
 	private final int permissionID = 1;
 
 	@Override
@@ -359,6 +384,7 @@ public class MainActivity extends AppCompatActivity {
 		state.putInt("recordRate", recordRate);
 		state.putInt("recordChannel", recordChannel);
 		state.putInt("audioSource", audioSource);
+		state.putInt("audioFormat", audioFormat);
 		state.putString("language", language);
 		super.onSaveInstanceState(state);
 	}
@@ -370,6 +396,7 @@ public class MainActivity extends AppCompatActivity {
 		edit.putInt("recordRate", recordRate);
 		edit.putInt("recordChannel", recordChannel);
 		edit.putInt("audioSource", audioSource);
+		edit.putInt("audioFormat", audioFormat);
 		edit.putString("language", language);
 		edit.apply();
 	}
@@ -379,6 +406,7 @@ public class MainActivity extends AppCompatActivity {
 		final int defaultSampleRate = 44100;
 		final int defaultChannelSelect = 0;
 		final int defaultAudioSource = MediaRecorder.AudioSource.MIC;
+		final int defaultAudioFormat = AudioFormat.ENCODING_PCM_FLOAT;
 		final String defaultLanguage = "system";
 		if (state == null) {
 			SharedPreferences pref = getPreferences(Context.MODE_PRIVATE);
@@ -386,12 +414,14 @@ public class MainActivity extends AppCompatActivity {
 			recordRate = pref.getInt("recordRate", defaultSampleRate);
 			recordChannel = pref.getInt("recordChannel", defaultChannelSelect);
 			audioSource = pref.getInt("audioSource", defaultAudioSource);
+			audioFormat = pref.getInt("audioFormat", defaultAudioFormat);
 			language = pref.getString("language", defaultLanguage);
 		} else {
 			AppCompatDelegate.setDefaultNightMode(state.getInt("nightMode", AppCompatDelegate.getDefaultNightMode()));
 			recordRate = state.getInt("recordRate", defaultSampleRate);
 			recordChannel = state.getInt("recordChannel", defaultChannelSelect);
 			audioSource = state.getInt("audioSource", defaultAudioSource);
+			audioFormat = state.getInt("audioFormat", defaultAudioFormat);
 			language = state.getString("language", defaultLanguage);
 		}
 		super.onCreate(state);
@@ -438,6 +468,7 @@ public class MainActivity extends AppCompatActivity {
 		updateRecordRateMenu();
 		updateRecordChannelMenu();
 		updateAudioSourceMenu();
+		updateAudioFormatMenu();
 		return true;
 	}
 
@@ -576,6 +607,14 @@ public class MainActivity extends AppCompatActivity {
 			setAudioSource(MediaRecorder.AudioSource.UNPROCESSED);
 			return true;
 		}
+		if (id == R.id.action_set_floating_point) {
+			setAudioFormat(AudioFormat.ENCODING_PCM_FLOAT);
+			return true;
+		}
+		if (id == R.id.action_set_fixed_point) {
+			setAudioFormat(AudioFormat.ENCODING_PCM_16BIT);
+			return true;
+		}
 		if (id == R.id.action_enable_night_mode) {
 			AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
 			return true;

app/src/main/res/menu/menu_main.xml

@@ -174,6 +174,18 @@
 							</group>
 						</menu>
 					</item>
+					<item android:title="@string/audio_format">
+						<menu>
+							<group android:checkableBehavior="single">
+								<item
+									android:id="@+id/action_set_floating_point"
+									android:title="@string/floating_point" />
+								<item
+									android:id="@+id/action_set_fixed_point"
+									android:title="@string/fixed_point" />
+							</group>
+						</menu>
+					</item>
 				</menu>
 			</item>
 			<item

app/src/main/res/values-de/strings.xml

@@ -23,6 +23,9 @@
 	<string name="source_camcorder">Videokamera</string>
 	<string name="source_voice_recognition">Spracherkennung</string>
 	<string name="source_unprocessed">Unbearbeitet</string>
+	<string name="audio_format">Audioformat</string>
+	<string name="fixed_point">Festkomma</string>
+	<string name="floating_point">Gleitkomma</string>
 	<string name="audio_init_failed">Audioinitialisierung fehlgeschlagen</string>
 	<string name="audio_setup_failed">Audioeinrichtung fehlgeschlagen</string>
 	<string name="audio_permission_denied">Audioberechtigung verweigert</string>

app/src/main/res/values-pt-rBR/strings.xml

@@ -23,6 +23,9 @@
 	<string name="source_camcorder">Filmadora</string>
 	<string name="source_voice_recognition">Reconhecimento de voz</string>
 	<string name="source_unprocessed">Não processado</string>
+	<string name="audio_format">Formato de Áudio</string>
+	<string name="fixed_point">Ponto Fixo</string>
+	<string name="floating_point">Ponto Flutuante</string>
 	<string name="audio_init_failed">Falha ao iniciar o áudio</string>
 	<string name="audio_setup_failed">Falha na configuração de áudio</string>
 	<string name="audio_permission_denied">Permissão de áudio negada</string>

app/src/main/res/values-ru/strings.xml

@@ -23,6 +23,9 @@
 	<string name="source_camcorder">Камера</string>
 	<string name="source_voice_recognition">Распознавание голоса</string>
 	<string name="source_unprocessed">Необработанный</string>
+	<string name="audio_format">Аудио формат</string>
+	<string name="fixed_point">Фиксированная точка</string>
+	<string name="floating_point">Плавающая точка</string>
 	<string name="audio_init_failed">Ошибка инициализации аудио</string>
 	<string name="audio_setup_failed">Ошибка настройки аудио</string>
 	<string name="audio_permission_denied">Аудио - отказано в доступе</string>

app/src/main/res/values-zh-rCN/strings.xml

@@ -23,6 +23,9 @@
 	<string name="source_camcorder">摄录机</string>
 	<string name="source_voice_recognition">音频识别</string>
 	<string name="source_unprocessed">不处理</string>
+	<string name="audio_format">音频格式</string>
+	<string name="fixed_point">定点数</string>
+	<string name="floating_point">浮点数</string>
 	<string name="audio_init_failed">初始化音频失败</string>
 	<string name="audio_setup_failed">音频设定失败</string>
 	<string name="audio_permission_denied">音频权限被拒绝</string>

app/src/main/res/values/strings.xml

@@ -54,6 +54,9 @@
 	<string name="source_camcorder">Camcorder</string>
 	<string name="source_voice_recognition">Voice Recognition</string>
 	<string name="source_unprocessed">Unprocessed</string>
+	<string name="audio_format">Audio Format</string>
+	<string name="fixed_point">Fixed Point</string>
+	<string name="floating_point">Floating Point</string>
 	<string name="audio_init_failed">Audio init failed</string>
 	<string name="audio_setup_failed">Audio setup failed</string>
 	<string name="audio_permission_denied">Audio permission denied</string>