Android: Camera code clean-up

Change-Id: Ib400afde12067764c3dcc0f44e40ddc1abb3012f
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

1 files changed, 148 insertions, 0 deletions

diff --git a/src/plugins/android/jar/src/org/qtproject/qt5/android/multimedia/QtCameraListener.java b/src/plugins/android/jar/src/org/qtproject/qt5/android/multimedia/QtCameraListener.java
new file mode 100644
index 000000000..27002fd29
--- /dev/null
+++ b/src/plugins/android/jar/src/org/qtproject/qt5/android/multimedia/QtCameraListener.java
@@ -0,0 +1,148 @@
+/****************************************************************************
+ **
+ ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+ ** Contact: http://www.qt-project.org/legal
+ **
+ ** This file is part of the QtMultimedia module of the Qt Toolkit.
+ **
+ ** $QT_BEGIN_LICENSE:LGPL$
+ ** Commercial License Usage
+ ** Licensees holding valid commercial Qt licenses may use this file in
+ ** accordance with the commercial license agreement provided with the
+ ** Software or, alternatively, in accordance with the terms contained in
+ ** a written agreement between you and Digia.  For licensing terms and
+ ** conditions see http://qt.digia.com/licensing.  For further information
+ ** use the contact form at http://qt.digia.com/contact-us.
+ **
+ ** GNU Lesser General Public License Usage
+ ** Alternatively, this file may be used under the terms of the GNU Lesser
+ ** General Public License version 2.1 as published by the Free Software
+ ** Foundation and appearing in the file LICENSE.LGPL included in the
+ ** packaging of this file.  Please review the following information to
+ ** ensure the GNU Lesser General Public License version 2.1 requirements
+ ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+ **
+ ** In addition, as a special exception, Digia gives you certain additional
+ ** rights.  These rights are described in the Digia Qt LGPL Exception
+ ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+ **
+ ** GNU General Public License Usage
+ ** Alternatively, this file may be used under the terms of the GNU
+ ** General Public License version 3.0 as published by the Free Software
+ ** Foundation and appearing in the file LICENSE.GPL included in the
+ ** packaging of this file.  Please review the following information to
+ ** ensure the GNU General Public License version 3.0 requirements will be
+ ** met: http://www.gnu.org/copyleft/gpl.html.
+ **
+ **
+ ** $QT_END_LICENSE$
+ **
+ ****************************************************************************/
+
+package org.qtproject.qt5.android.multimedia;
+
+import android.hardware.Camera;
+import android.graphics.ImageFormat;
+import android.graphics.SurfaceTexture;
+import android.util.Log;
+import java.lang.Math;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class QtCameraListener implements Camera.ShutterCallback,
+                                         Camera.PictureCallback,
+                                         Camera.AutoFocusCallback,
+                                         Camera.PreviewCallback
+{
+    private int m_cameraId = -1;
+    private byte[][] m_cameraPreviewBuffer = null;
+    private volatile int m_actualPreviewBuffer = 0;
+    private final ReentrantLock m_buffersLock = new ReentrantLock();
+    private boolean m_fetchEachFrame = false;
+
+    private static final String TAG = "Qt Camera";
+
+    private QtCameraListener(int id)
+    {
+        m_cameraId = id;
+    }
+
+    public void preparePreviewBuffer(Camera camera)
+    {
+        Camera.Size previewSize = camera.getParameters().getPreviewSize();
+        double bytesPerPixel = ImageFormat.getBitsPerPixel(camera.getParameters().getPreviewFormat()) / 8.0;
+        int bufferSizeNeeded = (int)Math.ceil(bytesPerPixel*previewSize.width*previewSize.height);
+        m_buffersLock.lock();
+        if (m_cameraPreviewBuffer == null || m_cameraPreviewBuffer[0].length < bufferSizeNeeded)
+            m_cameraPreviewBuffer = new byte[2][bufferSizeNeeded];
+        m_buffersLock.unlock();
+    }
+
+    public void fetchEachFrame(boolean fetch)
+    {
+        m_fetchEachFrame = fetch;
+    }
+
+    public byte[] lockAndFetchPreviewBuffer()
+    {
+        //This method should always be followed by unlockPreviewBuffer()
+        //This method is not just a getter. It also marks last preview as already seen one.
+        //We should reset actualBuffer flag here to make sure we will not use old preview with future captures
+        byte[] result = null;
+        m_buffersLock.lock();
+        result = m_cameraPreviewBuffer[(m_actualPreviewBuffer == 1) ? 0 : 1];
+        m_actualPreviewBuffer = 0;
+        return result;
+    }
+
+    public void unlockPreviewBuffer()
+    {
+        if (m_buffersLock.isHeldByCurrentThread())
+            m_buffersLock.unlock();
+    }
+
+    public byte[] callbackBuffer()
+    {
+        return m_cameraPreviewBuffer[(m_actualPreviewBuffer == 1) ? 1 : 0];
+    }
+
+    @Override
+    public void onShutter()
+    {
+        notifyPictureExposed(m_cameraId);
+    }
+
+    @Override
+    public void onPictureTaken(byte[] data, Camera camera)
+    {
+        notifyPictureCaptured(m_cameraId, data);
+    }
+
+    @Override
+    public void onPreviewFrame(byte[] data, Camera camera)
+    {
+        m_buffersLock.lock();
+
+        if (data != null && m_fetchEachFrame)
+            notifyFrameFetched(m_cameraId, data);
+
+        if (data == m_cameraPreviewBuffer[0])
+            m_actualPreviewBuffer = 1;
+        else if (data == m_cameraPreviewBuffer[1])
+            m_actualPreviewBuffer = 2;
+        else
+            m_actualPreviewBuffer = 0;
+        camera.addCallbackBuffer(m_cameraPreviewBuffer[(m_actualPreviewBuffer == 1) ? 1 : 0]);
+        m_buffersLock.unlock();
+    }
+
+    @Override
+    public void onAutoFocus(boolean success, Camera camera)
+    {
+        notifyAutoFocusComplete(m_cameraId, success);
+    }
+
+    private static native void notifyAutoFocusComplete(int id, boolean success);
+    private static native void notifyPictureExposed(int id);
+    private static native void notifyPictureCaptured(int id, byte[] data);
+    private static native void notifyFrameFetched(int id, byte[] data);
+}