Add GPUImageMovieWriter class

Adapted code from Grafika (https://github.com/google/grafika) to support
real-time video filtering;
support API>=18 only;
resolve cats-oss#25.

library/src/jp/co/cyberagent/android/gpuimage/GPUImage.java

@@ -50,8 +50,8 @@
  */
 public class GPUImage {
     private final Context mContext;
-    private final GPUImageRenderer mRenderer;
-    private GLSurfaceView mGlSurfaceView;
+    protected GPUImageRenderer mRenderer;
+    protected GLSurfaceView mGlSurfaceView;
     private GPUImageFilter mFilter;
     private Bitmap mCurrentBitmap;
     private ScaleType mScaleType = ScaleType.CENTER_CROP;

library/src/jp/co/cyberagent/android/gpuimage/GPUImageMovieWriter.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2016 Peter Lu
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jp.co.cyberagent.android.gpuimage;
+
+import android.content.Context;
+
+import java.io.File;
+
+public class GPUImageMovieWriter extends GPUImage {
+
+    public final static int RECORDING_OFF = 0;
+    public final static int RECORDING_ON = 1;
+
+    private int mRecordingState = RECORDING_OFF;
+
+    public GPUImageMovieWriter(final Context context, final File outputFile) {
+        super(context);
+        mRenderer = new GPUImageMovieWriterRenderer(new GPUImageFilter(), outputFile);
+        mRecordingState = RECORDING_OFF;
+    }
+
+    public int toggleRecording() {
+        if (mRecordingState == RECORDING_OFF) {
+            ((GPUImageMovieWriterRenderer)mRenderer).changeRecordingState(true);
+            mRecordingState = RECORDING_ON;
+        } else {
+            ((GPUImageMovieWriterRenderer)mRenderer).changeRecordingState(false);
+            mRecordingState = RECORDING_OFF;
+        }
+        return mRecordingState;
+    }
+
+    public void setOutputResolution(int width, int height) {
+        ((GPUImageMovieWriterRenderer)mRenderer).setOutputResolution(width, height);
+    }
+
+    public void setOutputBitrate(int bitrate) {
+        ((GPUImageMovieWriterRenderer)mRenderer).setOutputBitrate(bitrate);
+    }
+
+    public int getRecordingState() {
+        return mRecordingState;
+    }
+}

library/src/jp/co/cyberagent/android/gpuimage/GPUImageMovieWriterRenderer.java

@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2016 Peter Lu
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jp.co.cyberagent.android.gpuimage;
+
+import android.opengl.EGL14;
+
+import java.io.File;
+
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.opengles.GL10;
+
+public class GPUImageMovieWriterRenderer extends GPUImageRenderer {
+
+    public static final int RECORDING_OFF = 0;
+    public static final int RECORDING_ON = 1;
+    public static final int RECORDING_RESUMED = 2;
+
+    private TextureMovieEncoder mVideoEncoder;
+    private boolean mIsRecordingEnabled = false;
+    private int mRecordingStatus = RECORDING_OFF;
+    private File mOutputFile = null;
+    private int mOutputWidth = 480;
+    private int mOutoutHeight = 640;
+    private int mOutputBitrate = 1000000;
+
+    public void changeRecordingState(boolean isRecording) {
+        mIsRecordingEnabled = isRecording;
+    }
+
+    public GPUImageMovieWriterRenderer(GPUImageFilter filter, File outputFile) {
+        super(filter);
+        mOutputFile = outputFile;
+        if (mVideoEncoder == null) {
+            mVideoEncoder = new TextureMovieEncoder(mFilter);
+        }
+    }
+
+    @Override
+    public void onSurfaceCreated(final GL10 gl, final EGLConfig config) {
+        super.onSurfaceCreated(gl, config);
+        mRecordingStatus = mIsRecordingEnabled ? RECORDING_RESUMED : RECORDING_OFF;
+    }
+
+    @Override
+    public void onDrawFrame(final GL10 gl) {
+        super.onDrawFrame(gl);
+        if (mIsRecordingEnabled) {
+            switch (mRecordingStatus) {
+                case RECORDING_OFF:
+                    mVideoEncoder.startRecording(new TextureMovieEncoder.EncoderConfig(
+                            mOutputFile, mOutputWidth, mOutoutHeight, mOutputBitrate, EGL14.eglGetCurrentContext()
+                    ));
+                    mRecordingStatus = RECORDING_ON;
+                    break;
+                case RECORDING_RESUMED:
+                    mVideoEncoder.updateSharedContext(EGL14.eglGetCurrentContext());
+                    mRecordingStatus = RECORDING_ON;
+                    break;
+                case RECORDING_ON:
+                    break;
+                default:
+                    throw new RuntimeException("unknown status: " + mRecordingStatus);
+            }
+        } else {
+            switch (mRecordingStatus) {
+                case RECORDING_ON:
+                case RECORDING_RESUMED:
+                    mVideoEncoder.stopRecording();
+                    mRecordingStatus = RECORDING_OFF;
+                    break;
+                case RECORDING_OFF:
+                    break;
+                default:
+                    throw new RuntimeException("unknown status: " + mRecordingStatus);
+            }
+        }
+        mVideoEncoder.setTextureId(mGLTextureId);
+        mVideoEncoder.frameAvailable(mSurfaceTexture);
+    }
+
+    @Override
+    protected void adjustImageScaling() {
+        super.adjustImageScaling();
+        if (mVideoEncoder == null) {
+            // this may be called before the child constructor
+            mVideoEncoder = new TextureMovieEncoder(mFilter);
+        }
+        mVideoEncoder.setGLCubeBuffer(mGLCubeBuffer);
+        mVideoEncoder.setGLTextureBuffer(mGLTextureBuffer);
+    }
+
+    @Override
+    public void setFilter(GPUImageFilter filter) {
+        super.setFilter(filter);
+        mVideoEncoder.setFilter(filter);
+    }
+
+    public void setOutputResolution(int width, int height) {
+        mOutputWidth = width;
+        mOutoutHeight = height;
+    }
+
+    public void setOutputBitrate(int bitrate) {
+        mOutputBitrate = bitrate;
+    }
+}

library/src/jp/co/cyberagent/android/gpuimage/GPUImageRenderer.java

@@ -50,14 +50,14 @@ public class GPUImageRenderer implements Renderer, PreviewCallback {
             1.0f, 1.0f,
     };
 
-    private GPUImageFilter mFilter;
+    protected GPUImageFilter mFilter;
 
     public final Object mSurfaceChangedWaiter = new Object();
 
-    private int mGLTextureId = NO_IMAGE;
-    private SurfaceTexture mSurfaceTexture = null;
-    private final FloatBuffer mGLCubeBuffer;
-    private final FloatBuffer mGLTextureBuffer;
+    protected int mGLTextureId = NO_IMAGE;
+    protected SurfaceTexture mSurfaceTexture = null;
+    protected final FloatBuffer mGLCubeBuffer;
+    protected final FloatBuffer mGLTextureBuffer;
     private IntBuffer mGLRgbBuffer;
 
     private int mOutputWidth;
@@ -267,7 +267,7 @@ protected int getFrameHeight() {
         return mOutputHeight;
     }
 
-    private void adjustImageScaling() {
+    protected void adjustImageScaling() {
         float outputWidth = mOutputWidth;
         float outputHeight = mOutputHeight;
         if (mRotation == Rotation.ROTATION_270 || mRotation == Rotation.ROTATION_90) {