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POAndroid Speex echo cancellation problems
 

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  1. POAndroid Speex echo cancellation problems
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    <p>I have a basic audiorecord-audiotrack, udp packets voice chat between two android devices. It works, but I have a bad echo. I'm trying to remove the echo using Speex ported to android by JNI. The speex I imported works, but the echo cancellation doesn't. Native C code is:</p> <pre><code>#include &lt;jni.h&gt; #include &lt;speex/speex_echo.h&gt; #define FRAME_SIZE 256 #define FILTER_LENGTH 800 SpeexEchoState *echoState; // Initialization of echo cancelation void Java_telefonie_voip_VoIPActivity_InitEcho(JNIEnv * env, jobject jobj) { echoState = speex_echo_state_init(FRAME_SIZE, FILTER_LENGTH); } // Queue the frame to soundcard for playing (receiving) void Java_telefonie_voip_VoIPActivity_Playback(JNIEnv * env, jobject jobj, jshortArray inputFrame) { speex_echo_playback(echoState, inputFrame); } jshortArray Java_telefonie_voip_VoIPActivity_Capture(JNIEnv * env, jobject jobj, jshortArray inputFrame) { jshortArray outputFrame; speex_echo_capture(echoState, inputFrame, *&amp;outputFrame); return outputFrame; } // Destroing echo cancelation void Java_telefonie_voip_VoIPActivity_DestroyEcho(JNIEnv * env, jobject jobj) { speex_echo_state_destroy(echoState); } </code></pre> <p>And some of important java code:</p> <pre><code>native void InitEcho(); native void DestroyEcho(); native void Playback(short[] inputData); // listener/receiving native short[] Capture(short[] inputData); // recorder/sender static { System.loadLibrary("speex"); } public void Initialize () { minBufferSize = 4096; try { InitEcho(); } catch (Exception e){Log.e(TAG, "jni " + e.getMessage());} } public void startRecording () { isStreaming = true; streamingThread = new Thread(new Runnable(){ @Override public void run () { try { audioRecorder = new AudioRecord( MediaRecorder.AudioSource.MIC, sampleRate, channelConfig, audioFormat, minBufferSize*10 ); buffer = new short[minBufferSize]; audioRecorder.startRecording(); while(isStreaming) { sendPackets++; minBufferSize = audioRecorder.read(buffer, 0, buffer.length); // Echo cancelling buffer = Capture(buffer); // Send dataPacket = new DatagramPacket(ShortToByteArray(buffer), buffer.length*2, receiverAddressIA, serverPort1); dataSocket.send(dataPacket); } } catch(Exception e) { Log.e(TAG, "2" + e.getMessage()); } } }); streamingThread.start(); } public void startListen () { isListening = true; receivingThread = new Thread(new Runnable(){ @Override public void run () { try { audioTrack = new AudioTrack( AudioManager.STREAM_VOICE_CALL, sampleRate, channelConfig, audioFormat, minBufferSize*10, AudioTrack.MODE_STREAM ); audioTrack.play(); buffer2 = new short[minBufferSize]; while (isListening) { receivedPackets++; dataPacket2 = new DatagramPacket(ShortToByteArray(buffer2), buffer2.length*2); dataSocket2.receive(dataPacket2); // Cancel echo Playback(buffer2); // Queue to soundcard audioTrack.write(buffer2, 0, minBufferSize); } } catch(Exception e) { Log.e(TAG, "3" + e.getMessage()); } } }); receivingThread.start(); } public short[] ByteToShortArray(byte[] byteArray) { short[] shortArray = new short[byteArray.length/2]; ByteBuffer.wrap(byteArray).order(ByteOrder.BIG_ENDIAN).asShortBuffer().get(shortArray); return shortArray; } </code></pre> <p>The problem is that when I start the recorder/streaming thread, it shows me that it sends one package and then the app crashes with no message. Do you have any sugestions or advices? Please help me because I need to do this project asap and I've worked hard and documented myself but still it doesn't want to work well. Thank you!</p> <p>Edit: I've just discovered that</p> <pre><code>// Echo cancelling buffer = Capture(buffer); </code></pre> <p>is triggering the crash.</p>
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    1. USEmil Pana
    1. USEmil Pana
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    1. COAdded an update to my answer according to your update on the crash.
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      1. USSirKnigget
    2. COhi Emil Pana did u successfully removed the echo?
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      1. USSureshkumar Menon
    3. CODid you ever solved the problem ?
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      1. USAmit
 

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