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POHow to get raw preview data from Camera object at least 15 frames per second in Android?
 

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  1. POHow to get raw preview data from Camera object at least 15 frames per second in Android?
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    <p>I need to obtain raw preview data from Camera object at least <strong>15 frame per second</strong>, but I can only get a frame in 110 milliseconds which means I can get only 9 frames per second. I brief my code below.</p> <pre><code>Camera mCamera = Camera.open(); Camera.Parameters parameters = mCamera.getParameters(); parameters.setPreviewFrameRate(30); parameters.setPreviewFpsRange(15000,30000); mCamera.setParameters(parameters); mCamera.addCallbackBuffer(new byte[dataBufferSize]); //dataBufferSize stands for the byte size for a picture frame mCamera.addCallbackBuffer(new byte[dataBufferSize]); mCamera.addCallbackBuffer(new byte[dataBufferSize]); mCamera.setPreviewDisplay(videoCaptureViewHolder); //videoCaptureViewHolder is a SurfaceHolder object mCamera.setPreviewCallbackWithBuffer(new Camera.PreviewCallback() { private long timestamp=0; public synchronized void onPreviewFrame(byte[] data, Camera camera) { Log.v("CameraTest","Time Gap = "+(System.currentTimeMillis()-timestamp)); timestamp=System.currentTimeMillis(); //do picture data process camera.addCallbackBuffer(data); return; } } mCamera.startPreview(); </code></pre> <p>In the briefed code above, dataBufferSize and videoCaptureViewHolder is defined and calculated or assigned in other statements.</p> <p>I run my code, I can see preview on the screen and I get the log below:</p> <pre><code>... V/CameraTest( 5396): Time Gap = 105 V/CameraTest( 5396): Time Gap = 112 V/CameraTest( 5396): Time Gap = 113 V/CameraTest( 5396): Time Gap = 115 V/CameraTest( 5396): Time Gap = 116 V/CameraTest( 5396): Time Gap = 113 V/CameraTest( 5396): Time Gap = 115 ... </code></pre> <p>This means <strong>onPreviewFrame(byte[] data, Camera camera)</strong> is called every 110 milliseconds so I can get no more than 9 frames per second. And no matter what preview frame rate I set by issue <strong>setPreviewFrameRate()</strong> and what preview Fps range I set by issue <strong>setPreviewFpsRange()</strong>, the log is the same.</p> <p>Would some one give me some help on this problem? I need to obtain raw preview data from Camera object at least 15 frames per second. Thank you in advance.</p> <p>I put my entire code below.</p> <p>CameraTest.java</p> <pre><code>package test.cameratest; import java.io.IOException; import java.util.Iterator; import java.util.List; import android.app.Activity; import android.graphics.ImageFormat; import android.hardware.Camera; import android.hardware.Camera.ErrorCallback; import android.hardware.Camera.Parameters; import android.hardware.Camera.Size; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.SurfaceHolder.Callback; public class CameraTestActivity extends Activity { SurfaceView mVideoCaptureView; Camera mCamera; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mVideoCaptureView = (SurfaceView) findViewById(R.id.video_capture_surface); SurfaceHolder videoCaptureViewHolder = mVideoCaptureView.getHolder(); videoCaptureViewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); videoCaptureViewHolder.addCallback(new Callback() { public void surfaceDestroyed(SurfaceHolder holder) { } public void surfaceCreated(SurfaceHolder holder) { startVideo(); } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } }); } private void startVideo() { SurfaceHolder videoCaptureViewHolder = null; try { mCamera = Camera.open(); } catch (RuntimeException e) { Log.e("CameraTest", "Camera Open filed"); return; } mCamera.setErrorCallback(new ErrorCallback() { public void onError(int error, Camera camera) { } }); Camera.Parameters parameters = mCamera.getParameters(); parameters.setPreviewFrameRate(30); parameters.setPreviewFpsRange(15000,30000); List&lt;int[]&gt; supportedPreviewFps=parameters.getSupportedPreviewFpsRange(); Iterator&lt;int[]&gt; supportedPreviewFpsIterator=supportedPreviewFps.iterator(); while(supportedPreviewFpsIterator.hasNext()){ int[] tmpRate=supportedPreviewFpsIterator.next(); StringBuffer sb=new StringBuffer(); sb.append("supportedPreviewRate: "); for(int i=tmpRate.length,j=0;j&lt;i;j++){ sb.append(tmpRate[j]+", "); } Log.v("CameraTest",sb.toString()); } List&lt;Size&gt; supportedPreviewSizes=parameters.getSupportedPreviewSizes(); Iterator&lt;Size&gt; supportedPreviewSizesIterator=supportedPreviewSizes.iterator(); while(supportedPreviewSizesIterator.hasNext()){ Size tmpSize=supportedPreviewSizesIterator.next(); Log.v("CameraTest","supportedPreviewSize.width = "+tmpSize.width+"supportedPreviewSize.height = "+tmpSize.height); } mCamera.setParameters(parameters); if (null != mVideoCaptureView) videoCaptureViewHolder = mVideoCaptureView.getHolder(); try { mCamera.setPreviewDisplay(videoCaptureViewHolder); } catch (Throwable t) { } Log.v("CameraTest","Camera PreviewFrameRate = "+mCamera.getParameters().getPreviewFrameRate()); Size previewSize=mCamera.getParameters().getPreviewSize(); int dataBufferSize=(int)(previewSize.height*previewSize.width* (ImageFormat.getBitsPerPixel(mCamera.getParameters().getPreviewFormat())/8.0)); mCamera.addCallbackBuffer(new byte[dataBufferSize]); mCamera.addCallbackBuffer(new byte[dataBufferSize]); mCamera.addCallbackBuffer(new byte[dataBufferSize]); mCamera.setPreviewCallbackWithBuffer(new Camera.PreviewCallback() { private long timestamp=0; public synchronized void onPreviewFrame(byte[] data, Camera camera) { Log.v("CameraTest","Time Gap = "+(System.currentTimeMillis()-timestamp)); timestamp=System.currentTimeMillis(); try{ camera.addCallbackBuffer(data); }catch (Exception e) { Log.e("CameraTest", "addCallbackBuffer error"); return; } return; } }); try { mCamera.startPreview(); } catch (Throwable e) { mCamera.release(); mCamera = null; return; } } private void stopVideo() { if(null==mCamera) return; try { mCamera.stopPreview(); mCamera.setPreviewDisplay(null); mCamera.setPreviewCallbackWithBuffer(null); mCamera.release(); } catch (IOException e) { e.printStackTrace(); return; } mCamera = null; } public void finish(){ stopVideo(); super.finish(); }; } </code></pre> <p>AndroidManifest.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="test.cameratest" android:versionCode="1" android:versionName="1.0"&gt; &lt;uses-sdk android:minSdkVersion="9" android:targetSdkVersion="10" android:maxSdkVersion="10"/&gt; &lt;uses-permission android:name="android.permission.CAMERA" /&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;uses-permission android:name="android.permission.VIBRATE" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /&gt; &lt;uses-permission android:name="android.permission.WAKE_LOCK" /&gt; &lt;uses-permission android:name="android.permission.RECORD_AUDIO" /&gt; &lt;uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/&gt; &lt;uses-permission android:name="android.permission.READ_CONTACTS"/&gt; &lt;uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/&gt; &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/&gt; &lt;uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/&gt; &lt;uses-permission android:name="android.permission.CALL_PHONE"/&gt; &lt;uses-permission android:name="android.permission.BOOT_COMPLETED"/&gt; &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/&gt; &lt;uses-permission android:name="android.permission.WRITE_SETTINGS" /&gt; &lt;application android:icon="@drawable/icon" android:label="@string/app_name"&gt; &lt;activity android:name=".CameraTestActivity" android:label="@string/app_name"&gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre>
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