Possible to specify audio device and default to hw:0 to stop using PusleAudio

jni/nv_alsa/nv_alsa.c

@@ -7,13 +7,13 @@
 
 snd_pcm_t *handle;
 
-int nv_alsa_init(unsigned int channelCount, unsigned int sampleRate) {
+int nv_alsa_init(unsigned int channelCount, unsigned int sampleRate, unsigned char* device) {
 	int rc;
 	snd_pcm_hw_params_t *params;
 	int dir;
 	
 	/* Open PCM device for playback. */
-	if ((rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0)) != 0)
+	if ((rc = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) != 0)
 		return rc;
 	
 	snd_pcm_hw_params_alloca(&params);

jni/nv_alsa/nv_alsa.h

@@ -1,5 +1,5 @@
 #include <jni.h>
 
-int nv_alsa_init(unsigned int channelCount, unsigned int sampleRate);
+int nv_alsa_init(unsigned int channelCount, unsigned int sampleRate, unsigned char* indata);
 int nv_alsa_play(unsigned char* indata, int inlen);
 void nv_alsa_close(void);

jni/nv_alsa/nv_alsa_jni.c

@@ -6,9 +6,19 @@
 // This function must be called before
 // any other decoding functions
 JNIEXPORT jint JNICALL
-Java_com_limelight_binding_audio_AlsaAudio_init(JNIEnv *env, jobject this, jint channelCount, jint sampleRate)
+Java_com_limelight_binding_audio_AlsaAudio_init(JNIEnv *env, jobject this, jint channelCount, jint sampleRate, jbyteArray device)
 {
-	return nv_alsa_init(channelCount, sampleRate);
+	jint ret;
+	jbyte* jni_device;
+	
+	jni_device = (*env)->GetByteArrayElements(env, device, 0);
+	
+	ret = nv_alsa_init(channelCount, sampleRate, jni_device);
+	
+	// The input data isn't changed so it can be safely aborted
+	(*env)->ReleaseByteArrayElements(env, device, jni_device, JNI_ABORT);
+	
+	return ret;
 }
 
 JNIEXPORT void JNICALL

src/com/limelight/Limelight.java

@@ -43,7 +43,7 @@ public class Limelight implements NvConnectionListener {
 	/*
 	 * Creates a connection to the host and starts up the stream.
 	 */
-	private void startUp(StreamConfiguration streamConfig, List<String> inputs, String mappingFile) {
+	private void startUp(StreamConfiguration streamConfig, List<String> inputs, String mappingFile, String audioDevice) {
 		String vm = System.getProperties().getProperty("java.vm.name");
 		if (!vm.contains("HotSpot")) {
 			System.err.println("You are using a unsupported VM: " + vm);
@@ -87,11 +87,11 @@ public class Limelight implements NvConnectionListener {
 				displayError("Input", "Are you running as root?");
 				return;
 			}
-		}		
+		}
 		
 		conn.start(PlatformBinding.getDeviceName(), null,
 				VideoDecoderRenderer.FLAG_PREFER_QUALITY,
-				PlatformBinding.getAudioRenderer(),
+				PlatformBinding.getAudioRenderer(audioDevice),
 				PlatformBinding.getVideoDecoderRenderer());
 	}
 	
@@ -151,6 +151,7 @@ public class Limelight implements NvConnectionListener {
 		int refresh = 60;
 		boolean parse = true;
 		String mapping = null;
+		String audio = "hw:0";
 		
 		for (int i = 0; i < args.length - 1; i++) {
 			if (args[i].equals("-input")) {
@@ -169,6 +170,14 @@ public class Limelight implements NvConnectionListener {
 					System.out.println("Syntax error: mapping file expected after -mapping");
 					System.exit(3);
 				}
+			} else if (args[i].equals("-audio")) {
+				if (i + 1 < args.length) {
+					audio = args[i+1];
+					i++;
+				} else {
+					System.out.println("Syntax error: audio device expected after -audio");
+					System.exit(3);
+				}
 			} else if (args[i].equals("-pair")) {
 				pair = true;
 			} else if (args[i].equals("-720")) {
@@ -194,6 +203,7 @@ public class Limelight implements NvConnectionListener {
 			System.out.println("\t-input <device>\tUse <device> as input. Can be used multiple times");
 			System.out.println("\t\t\t[default uses all devices in /dev/input]");
 			System.out.println("\t-mapping <file>\tUse <file> as gamepad mapping configuration file");
+			System.out.println("\t-audio <device>\tUse <device> as ALSA audio output device (default hw:0)");
 			System.out.println("\t-pair\t\tPair with host");
 			System.out.println();
 			System.out.println("Use ctrl-c to exit application");
@@ -205,7 +215,7 @@ public class Limelight implements NvConnectionListener {
 		
 		Limelight limelight = new Limelight(host);
 		if (!pair)
-			limelight.startUp(streamConfig, inputs, mapping);
+			limelight.startUp(streamConfig, inputs, mapping, audio);
 		else
 			limelight.pair();
 	}

src/com/limelight/binding/PlatformBinding.java

@@ -39,7 +39,7 @@ public class PlatformBinding {
 	 * Gets an instance of an audio decoder/renderer.
 	 * @return an audio decoder and renderer
 	 */
-	public static AudioRenderer getAudioRenderer() {
+	public static AudioRenderer getAudioRenderer(String device) {
-		return new AlsaAudioRenderer();
+		return new AlsaAudioRenderer(device);
 	}
 }

src/com/limelight/binding/audio/AlsaAudio.java

@@ -9,7 +9,7 @@ public class AlsaAudio {
 		System.loadLibrary("nv_alsa");
 	}
 	
-	public static native int init(int channelCount, int sampleRate);
+	public static native int init(int channelCount, int sampleRate, byte[] device);
 	
 	public static native void close();
 	

src/com/limelight/binding/audio/AlsaAudioRenderer.java

@@ -7,10 +7,16 @@ import com.limelight.nvstream.av.audio.AudioRenderer;
  * @author Iwan Timmer
  */
 public class AlsaAudioRenderer implements AudioRenderer {
+	
+	private String device;
+	
+	public AlsaAudioRenderer(String device) {
+		this.device = device;
+	}
 
 	@Override
 	public void streamInitialized(int channelCount, int sampleRate) {
-		int ret = AlsaAudio.init(channelCount, sampleRate);
+		int ret = AlsaAudio.init(channelCount, sampleRate, device.getBytes());
 		if (ret != 0)
 			throw new IllegalStateException("AVC decoder initialization failure: "+ret);
 	}