// 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);
if (mGlTextures != 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 static class ChromiumCameraInfo {
private final int mId;
private final Camera.CameraInfo mCameraInfo;
private ChromiumCameraInfo(int index) {
mId = index;
mCameraInfo = new Camera.CameraInfo();
Camera.getCameraInfo(index, mCameraInfo);
}
@CalledByNative("ChromiumCameraInfo")
private static int getNumberOfCameras() {
return Camera.getNumberOfCameras();
}
@CalledByNative("ChromiumCameraInfo")
private static ChromiumCameraInfo getAt(int index) {
return new ChromiumCameraInfo(index);
}
@CalledByNative("ChromiumCameraInfo")
private int getId() {
return mId;
}
@CalledByNative("ChromiumCameraInfo")
private String getDeviceName() {
return "camera " + mId + ", facing " +
(mCameraInfo.facing ==
Camera.CameraInfo.CAMERA_FACING_FRONT ? "front" : "back");
}
@CalledByNative("ChromiumCameraInfo")
private int getOrientation() {
return mCameraInfo.orientation;
}
}
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;
}
}