[android-developers] Help Needed : MediaRecorder error: java.io.IOException: prepare failed

[preetam_pict]

Hi all

I am trying to write a sample program to record the video (say
camcorder application).
When i run my program using the emulator (I have android-sdk-
windows-1.5_r3) I see java.io.IOException: prepare failed. error in
logcat output.

Further I can see that I have came across this error when i call
MediaRecorder.prepare()
from CamcorderActivity.surfaceCreated()
But I am surprised to see that activity got launched and I am seeing
the camera preview!  Again the preview is seen only in half of the
screen! Its weird!!!

Further when i do recorder.start() to record the video I get
java.lang.IllegalStateException. Yes this is obvious since the prepare
() has failed.
But the question is why prepare() has failed ?

Can someone please help me to understand whats happening here!
Am i missing something ???

thanks in advance
~pp

Here is my code ...
package com.example;

import java.io.IOException;

import android.app.Activity;
import android.graphics.PixelFormat;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class CamcorderActivity extends Activity implements
        SurfaceHolder.Callback
{
    private MediaRecorder recorder;
    private SurfaceView   surfaceView;
    private SurfaceHolder surfaceHolder;

    private boolean       recording = false;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        // configure the surface
        getWindow().setFormat(PixelFormat.TRANSLUCENT);
        setContentView(R.layout.main);
        surfaceView = (SurfaceView) findViewById(R.id.camcordersurface);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        configureRecorder();
    }

    private void configureRecorder()
    {
        // configure media recorder
        recorder = new MediaRecorder();
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
    }

    private void stopRecorder()
    {
        try
        {
            if (recorder == null)
            {
                return;
            }
            recorder.stop();
            recorder.reset();
            recorder.release();
            recording = false;
            recorder = null;
        }
        finally
        {
            if (recorder != null)
            {
                recorder.release();
            }
        }
    }

    private void startRecorder()
    {
        recorder.start();
        recording = true;
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event)
    {
        if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER)
        {
            // if not recording then start
            if (!recording)
            {
                startRecorder();
            }
            else
            {
                // if already recording then stop
                stopRecorder();
                finish();
            }
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int
width,
            int height)
    {
        // do nothing
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder)
    {
        recorder.setOutputFile("/sdcard/test" + System.currentTimeMillis()
                + ".mp4");
        recorder.setPreviewDisplay(holder.getSurface());
        try
        {
            recorder.prepare();
        }
        catch (IOException e)
        {
            Log.e("error -- ", e.toString(), e);
            // TODO:
            // show error message
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder)
    {
        stopRecorder();
    }
}

And the layout ...

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
        android:orientation="vertical" android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <SurfaceView android:id="@+id/camcordersurface"
                android:layout_width="fill_parent" android:layout_height="10dip"
                android:layout_weight="1">
        </SurfaceView>
</LinearLayout>

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