Android的Speex语音回声消除问题回声、语音、问题、Android

2023-09-14 00:04:19 作者：小祸害

我有一个基本的audiorecord-audiotrack，两款Android设备之间的UDP数据包语音聊天。它的工作原理，但我有一个坏的回声。我试图删除使用Speex语音移植通过JNI到Android回声。在我的Speex进口工作，但回音消除不。本机C code是：

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:

#include <jni.h>
#include <speex/speex_echo.h> 

#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, *&outputFrame);

    return outputFrame;
}

// Destroing echo cancelation
void Java_telefonie_voip_VoIPActivity_DestroyEcho(JNIEnv * env, jobject jobj)
{
speex_echo_state_destroy(echoState); 
}

和一些重要的Java code：

And some of important java 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;
}

现在的问题是，当我开始记录/流线，它让我发现，它发送一个包，然后没有消息应用程序崩溃。你有任何sugestions或建议？请帮助我，因为我需要尽快做这个项目，我已经努力过，记录自己，但它仍然不希望正常工作。谢谢！

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!

编辑：我刚刚发现，

//  Echo cancelling
buffer = Capture(buffer);

被触发崩溃。

is triggering the crash.

Android的Speex语音回声消除问题回声、语音、问题、Android

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