1.视频解码 使用MediaExtractor MediaCodec解码MP4文件渲染到TextureView SurfaceTexture生成的Surface上。 渲染的过程中可以添加滤镜以及opengl的其他渲染。
a.TextureView->SurfaceTexture->Surface 作为outputSurface b.VideoTextureRenderThread使用outputSurface创建GL环境，然后创建输入Surface inputSurface c.使用inputSurface 创建MediaExtractor 和 MeidaCodec 解码器，解码到inputSurface d.渲染然到outputSurface
2.相机预览(预览都是通过C++代码实现，提高效率)
a.YUV数据预览，不需要在cpu中进行格式转换，直接opengl渲染 camera->onPreviewFrame->opengl渲染->display camera CameraDataPreviewActivity.java
mPreviewTexture.setSurfaceTextureListener(this);
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
mRender = Renderer.prepare(new Surface(surface), width, height);
startCamera();
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
stopCamera();
return true;
}
private void startCamera() {
CameraManager.getInstance().startCamera(this, 640, 480, CameraManager.MODE_PREVIEW_DATA,
new CameraManager.CameraStateListener() {
@Override
public void onError(int errorType) {
}
@Override
public void onSuccess(SurfaceTexture surfaceTexture, int width, int height) {
}
});
CameraManager.getInstance().setDataCallback(new CameraManager.DataCallback() {
@Override
public void callback(byte[] data, int mWidth, int mHeight, int mCameraOrientation,
int mCameraIndex) {
if (mRender != null) {
mRender.process(data, mWidth ,mHeight, mCameraOrientation,
mCameraIndex == Camera.CameraInfo.CAMERA_FACING_FRONT, 0);
}
}
});
}
private void stopCamera() {
CameraManager.getInstance().stopCamera();
if (mRender != null) {
mRender.release();
}
}
b.Texture预览，创建opengl的surfaceTexture给相机预览，拷贝surfaceTexture数据到显示的TextureView时，进行opengl滤镜
CameraPreviewActivity.java
textureView.setSurfaceTextureListener(this);
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
mRender = new CameraTextureRender(new Surface(surface), width, height, new CameraTextureRenderListener() {
@Override
public void onInputTextureCreate(SurfaceTexture surfaceTexture, int width, int height) {
CameraManager.getInstance().startCamera(CameraPreviewActivity.this,
640, 480, MODE_PREVIEW_TEXTURE, surfaceTexture, new CameraStateListener() {
@Override
public void onError(int errorType) {
}
@Override
public void onSuccess(SurfaceTexture surfaceTexture,
int width, int height) {
mRender.setCameraSize(width, height);
}
});
}
});
mRender.setScale(true);
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
CameraManager.getInstance().stopCamera();
if (mRender != null) {
mRender.release();
}
return true;
}