Add video capture on Android.

media/base/android/java/src/org/chromium/media/VideoCapture.java

Index: media/base/android/java/src/org/chromium/media/VideoCapture.java
===================================================================
--- media/base/android/java/src/org/chromium/media/VideoCapture.java	(revision 0)
+++ media/base/android/java/src/org/chromium/media/VideoCapture.java	(revision 0)
@@ -0,0 +1,338 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.media;
+
+import android.content.Context;
+import android.graphics.ImageFormat;
+import android.graphics.SurfaceTexture;
+import android.graphics.SurfaceTexture.OnFrameAvailableListener;
+import android.hardware.Camera;
+import android.hardware.Camera.PreviewCallback;
+import android.opengl.GLES20;
+import android.util.Log;
+import android.view.Surface;
+import android.view.WindowManager;
+
+import java.io.IOException;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.Iterator;
+import java.util.List;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+@JNINamespace("media")
+public class VideoCapture implements PreviewCallback, OnFrameAvailableListener {
+    static class CaptureCapability {
+        public int mWidth = 0;
+        public int mHeight = 0;
+        public int mDesiredFps = 0;
+    }
+
+    private Camera mCamera;
+    public ReentrantLock mPreviewBufferLock = new ReentrantLock();
+    private int mPixelFormat = ImageFormat.YV12;
+    private Context mContext = null;
+    // True when native code has started capture.
+    private boolean mIsRunning = false;
+
+    private static final int NUM_CAPTURE_BUFFERS = 3;
+    private int mExpectedFrameSize = 0;
+    private int mId = 0;
+    // Native callback context variable.
+    private int mNativeVideoCaptureDeviceAndroid = 0;
+    private int[] mGlTextures = null;
+    private SurfaceTexture mSurfaceTexture = null;
+    private static final int GL_TEXTURE_EXTERNAL_OES = 0x8D65;
+
+    private int mCameraOrientation = 0;
+    private int mCameraFacing = 0;
+    private int mDeviceOrientation = 0;
+
+    CaptureCapability mCurrentCapability = null;
+    private static final String TAG = "VideoCapture";
+
+    @CalledByNative
+    public static VideoCapture createVideoCapture(
+            Context context, int id, int nativeVideoCaptureDeviceAndroid) {
+        return new VideoCapture(context, id, nativeVideoCaptureDeviceAndroid);
+    }
+
+    public VideoCapture(
+            Context context, int id, int nativeVideoCaptureDeviceAndroid) {
+        mContext = context;
+        mId = id;
+        mNativeVideoCaptureDeviceAndroid = nativeVideoCaptureDeviceAndroid;
+    }
+
+    // Returns true on success, false otherwise.
+    @CalledByNative
+    public boolean allocate(int width, int height, int frameRate) {
+        Log.d(TAG, "allocate: requested width=" + width +
+              ", height=" + height + ", frameRate=" + frameRate);
+        try {
+            mCamera = Camera.open(mId);
+            Camera.CameraInfo camera_info = new Camera.CameraInfo();
+            Camera.getCameraInfo(mId, camera_info);
+            mCameraOrientation = camera_info.orientation;
+            mCameraFacing = camera_info.facing;
+            mDeviceOrientation = getDeviceOrientation();
+            Log.d(TAG, "allocate: device orientation=" + mDeviceOrientation +
+                  ", camera orientation=" + mCameraOrientation +
+                  ", facing=" + mCameraFacing);
+
+            Camera.Parameters parameters = mCamera.getParameters();
+
+            // Calculate fps.
+            List<int[]> listFpsRange = parameters.getSupportedPreviewFpsRange();
+            int frameRateInMs = frameRate * 1000;
+            boolean fpsIsSupported = false;
+            int fpsMin = 0;
+            int fpsMax = 0;
+            Iterator itFpsRange = listFpsRange.iterator();
+            while (itFpsRange.hasNext()) {
+                int[] fpsRange = (int[])itFpsRange.next();
+                if (fpsRange[0] <= frameRateInMs &&
+                    frameRateInMs <= fpsRange[1]) {
+                    fpsIsSupported = true;
+                    fpsMin = fpsRange[0];
+                    fpsMax = fpsRange[1];
+                    break;
+                }
+            }
+
+            if (!fpsIsSupported) {
+                Log.e(TAG, "allocate: fps " + frameRate + " is not supported");
+                return false;
+            }
+
+            mCurrentCapability = new CaptureCapability();
+            mCurrentCapability.mDesiredFps = frameRate;
+
+            // Calculate size.
+            List<Camera.Size> listCameraSize =
+                    parameters.getSupportedPreviewSizes();
+            int minDiff = Integer.MAX_VALUE;
+            int matchedWidth = width;
+            int matchedHeight = height;
+            Iterator itCameraSize = listCameraSize.iterator();
+            while (itCameraSize.hasNext()) {
+                Camera.Size size = (Camera.Size)itCameraSize.next();
+                int diff = Math.abs(size.width - width) +
+                           Math.abs(size.height - height);
+                Log.d(TAG, "allocate: support resolution (" +
+                      size.width + ", " + size.height + "), diff=" + diff);
+                // TODO(wjia): Remove this hack (forcing width to be multiple
+                // of 32) by supporting stride in video frame buffer.
+                // Right now, VideoCaptureController requires compact YV12
+                // (i.e., with no padding).
+                if (diff < minDiff && (size.width % 32 == 0)) {
+                    minDiff = diff;
+                    matchedWidth = size.width;
+                    matchedHeight = size.height;
+                }
+            }
+            if (minDiff == Integer.MAX_VALUE) {
+                Log.e(TAG, "allocate: can not find a resolution whose width is multiple of 32");
+                return false;
+            }
+            mCurrentCapability.mWidth = matchedWidth;
+            mCurrentCapability.mHeight = matchedHeight;
+            Log.d(TAG, "allocate: matched width=" + matchedWidth +
+                  ", height=" + matchedHeight);
+
+            parameters.setPreviewSize(matchedWidth, matchedHeight);
+            parameters.setPreviewFormat(mPixelFormat);
+            parameters.setPreviewFpsRange(fpsMin, fpsMax);
+            mCamera.setParameters(parameters);
+
+            // Set SurfaceTexture.
+            mGlTextures = new int[1];
+            // Generate one texture pointer and bind it as an external texture.
+            GLES20.glGenTextures(1, mGlTextures, 0);
+            GLES20.glBindTexture(GL_TEXTURE_EXTERNAL_OES, mGlTextures[0]);
+            // No mip-mapping with camera source.
+            GLES20.glTexParameterf(GL_TEXTURE_EXTERNAL_OES,
+                    GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
+            GLES20.glTexParameterf(GL_TEXTURE_EXTERNAL_OES,
+                    GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
+            // Clamp to edge is only option.
+            GLES20.glTexParameteri(GL_TEXTURE_EXTERNAL_OES,
+                    GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+            GLES20.glTexParameteri(GL_TEXTURE_EXTERNAL_OES,
+                    GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+
+            mSurfaceTexture = new SurfaceTexture(mGlTextures[0]);
+            mSurfaceTexture.setOnFrameAvailableListener(null);
+
+            mCamera.setPreviewTexture(mSurfaceTexture);
+
+            int bufSize = matchedWidth * matchedHeight *
+                          ImageFormat.getBitsPerPixel(mPixelFormat) / 8;
+            for (int i = 0; i < NUM_CAPTURE_BUFFERS; i++) {
+                byte[] buffer = new byte[bufSize];
+                mCamera.addCallbackBuffer(buffer);
+            }
+            mExpectedFrameSize = bufSize;
+        } catch (IOException ex) {
+            Log.e(TAG, "allocate: " + ex);
+            return false;
+        }
+
+        return true;
+    }
+
+    @CalledByNative
+    public int queryWidth() {
+        return mCurrentCapability.mWidth;
+    }
+
+    @CalledByNative
+    public int queryHeight() {
+        return mCurrentCapability.mHeight;
+    }
+
+    @CalledByNative
+    public int queryFrameRate() {
+        return mCurrentCapability.mDesiredFps;
+    }
+
+    @CalledByNative
+    public int startCapture() {
+        if (mCamera == null) {
+            Log.e(TAG, "startCapture: camera is null");
+            return -1;
+        }
+
+        mPreviewBufferLock.lock();
+        try {
+            if (mIsRunning) {
+                return 0;
+            }
+            mIsRunning = true;
+        } finally {
+            mPreviewBufferLock.unlock();
+        }
+        mCamera.setPreviewCallbackWithBuffer(this);
+        mCamera.startPreview();
+        return 0;
+    }
+
+    @CalledByNative
+    public int stopCapture() {
+        if (mCamera == null) {
+            Log.e(TAG, "stopCapture: camera is null");
+            return 0;
+        }
+
+        mPreviewBufferLock.lock();
+        try {
+            if (!mIsRunning) {
+                return 0;
+            }
+            mIsRunning = false;
+        } finally {
+            mPreviewBufferLock.unlock();
+        }
+
+        mCamera.stopPreview();
+        mCamera.setPreviewCallbackWithBuffer(null);
+        return 0;
+    }
+
+    @CalledByNative
+    public void deallocate() {
+        if (mCamera == null)
+            return;
+
+        stopCapture();
+        try {
+            mCamera.setPreviewTexture(null);
+            mSurfaceTexture.setOnFrameAvailableListener(null);
+            GLES20.glDeleteTextures(1, mGlTextures, 0);
+            mCurrentCapability = null;
+            mCamera.release();
+            mCamera = null;
+        } catch (IOException ex) {
+            Log.e(TAG, "deallocate: failed to deallocate camera, " + ex);
+            return;
+        }
+    }
+
+    @Override
+    public void onPreviewFrame(byte[] data, Camera camera) {
+        mPreviewBufferLock.lock();
+        try {
+            if (!mIsRunning) {
+                return;
+            }
+            if (data.length == mExpectedFrameSize) {
+                int rotation = getDeviceOrientation();
+                if (rotation != mDeviceOrientation) {
+                    mDeviceOrientation = rotation;
+                    Log.d(TAG,
+                          "onPreviewFrame: device orientation=" +
+                          mDeviceOrientation + ", camera orientation=" +
+                          mCameraOrientation);
+                }
+                boolean flipVertical = false;
+                boolean flipHorizontal = false;
+                if (mCameraFacing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
+                    rotation = (mCameraOrientation + rotation) % 360;
+                    rotation = (360 - rotation) % 360;
+                    flipHorizontal = (rotation == 180 || rotation == 0);
+                    flipVertical = !flipHorizontal;
+                } else {
+                    rotation = (mCameraOrientation - rotation + 360) % 360;
+                }
+                nativeOnFrameAvailable(mNativeVideoCaptureDeviceAndroid,
+                        data, mExpectedFrameSize,
+                        rotation, flipVertical, flipHorizontal);
+            }
+        } finally {
+            mPreviewBufferLock.unlock();
+            if (camera != null) {
+                camera.addCallbackBuffer(data);
+            }
+        }
+    }
+
+    // TODO(wjia): investigate whether reading from texture could give better
+    // performance and frame rate.
+    @Override
+    public void onFrameAvailable(SurfaceTexture surfaceTexture) { }
+
+    private native void nativeOnFrameAvailable(
+            int nativeVideoCaptureDeviceAndroid,
+            byte[] data,
+            int length,
+            int rotation,
+            boolean flipVertical,
+            boolean flipHorizontal);
+
+    private int getDeviceOrientation() {
+        int orientation = 0;
+        if (mContext != null) {
+            WindowManager wm = (WindowManager)mContext.getSystemService(
+                    Context.WINDOW_SERVICE);
+            switch(wm.getDefaultDisplay().getRotation()) {
+                case Surface.ROTATION_90:
+                    orientation = 90;
+                    break;
+                case Surface.ROTATION_180:
+                    orientation = 180;
+                    break;
+                case Surface.ROTATION_270:
+                    orientation = 270;
+                    break;
+                case Surface.ROTATION_0:
+                default:
+                    orientation = 0;
+                    break;
+            }
+        }
+        return orientation;
+    }
+}