OnPreviewframe sólo se llama una vez

Estoy trabajando en una aplicación de cámara, y necesidad de extraer algunos datos de la vista previa de cada marco por lo que trató de hacerlo con onPreviewFrame, el problema es que con mi código onPreviewFrame sólo se llama una vez y mientras se depura no tengo errores por lo que no se que hacer

Aquí está mi código

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public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { private static final String TAG = "CameraPreview"; private SurfaceHolder mHolder; private Camera mCamera; public byte[] buffer;//for previewcallback public CameraPreview(Context context, Camera camera) { super(context); Log.d("Function", "CameraPreview constructor iniciado"); mCamera = camera; // Install a SurfaceHolder.Callback so we get notified when the // underlying surface is created and destroyed. mHolder = getHolder(); mHolder.addCallback(this); // deprecated setting, but required on Android versions prior to 3.0 mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { // The Surface has been created, now tell the camera where to draw the preview. Log.d("Function", "SurfaceCreated iniciado"); try { mCamera.setPreviewDisplay(holder); buffer = previewBuffer(); mCamera.addCallbackBuffer(buffer); mCamera.setPreviewCallbackWithBuffer(previewCallback); mCamera.startPreview(); } catch (IOException e) { Log.d(TAG, "Error setting camera preview: " + e.getMessage()); } } public void surfaceDestroyed(SurfaceHolder holder) { // Surface will be destroyed when we return, so stop the preview. Log.d("Function", "SurfaceDestroyed iniciado"); } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { // If your preview can change or rotate, take care of those events here. // Make sure to stop the preview before resizing or reformatting it. Log.d("Function", "surfaceChanged iniciado"); if (mHolder.getSurface() == null) { // preview surface does not exist return; } // stop preview before making changes try { mCamera.stopPreview(); } catch (Exception e) { // ignore: tried to stop a non-existent preview } // set preview size and make any resize, rotate or // reformatting changes here // start preview with new settings try { mCamera.setPreviewDisplay(mHolder); buffer = previewBuffer(); mCamera.addCallbackBuffer(buffer); mCamera.setPreviewCallbackWithBuffer(previewCallback); mCamera.startPreview(); } catch (Exception e) { Log.d(TAG, "Error starting camera preview: " + e.getMessage()); } } //Create the callback to access preview frames PreviewCallback previewCallback = new PreviewCallback() { public void onPreviewFrame(byte[] data, Camera camera) { // TODO Auto-generated method stub Log.d("Function", "onPreviewFrame iniciado"); //Convert to jpg Size previewSize = camera.getParameters().getPreviewSize(); Log.d("Function", "onPreviewFrame: preview size=" + previewSize.height + " " + previewSize.width); YuvImage yuvImage = new YuvImage(data, ImageFormat.NV21, previewSize.width, previewSize.height, null); ByteArrayOutputStream baos = new ByteArrayOutputStream(); yuvImage.compressToJpeg(new Rect(0, 0, previewSize.width, previewSize.height), 80, baos); byte jpgData[] = baos.toByteArray(); } }; //To create a buffer of the preview bytes size private byte[] previewBuffer() { Log.d("Function", "previewBuffer iniciado"); int bufferSize; byte buffer[]; int bitsPerPixel; Camera.Parameters mParams = mCamera.getParameters(); Camera.Size mSize = mParams.getPreviewSize(); Log.d("Function", "previewBuffer: preview size=" + mSize.height + " " + mSize.width); int mImageFormat = mParams.getPreviewFormat(); if (mImageFormat == ImageFormat.YV12) { int yStride = (int) Math.ceil(mSize.width / 16.0) * 16; int uvStride = (int) Math.ceil((yStride / 2) / 16.0) * 16; int ySize = yStride * mSize.height; int uvSize = uvStride * mSize.height / 2; bufferSize = ySize + uvSize * 2; buffer = new byte[bufferSize]; Log.d("Function", "previewBuffer: buffer size=" + Integer.toString(bufferSize)); return buffer; } bitsPerPixel = ImageFormat.getBitsPerPixel(mImageFormat); bufferSize = (int) (mSize.height * mSize.width * ((bitsPerPixel / (float) 8))); buffer = new byte[bufferSize]; Log.d("Function", "previewBuffer: buffer size=" + Integer.toString(bufferSize)); return buffer; } }