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/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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 com.android.camera.one.v2.initialization;
import android.view.Surface;
import com.android.camera.one.OneCamera;
import com.android.camera.one.v2.camera2proxy.CameraCaptureSessionProxy;
import com.google.common.util.concurrent.AsyncFunction;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.ArrayList;
import java.util.List;
/**
* When the preview surface is available, creates a capture session, and then
* notifies the listener when the session is available.
*/
class PreviewStarter {
public interface CameraCaptureSessionCreatedListener {
public void onCameraCaptureSessionCreated(CameraCaptureSessionProxy session, Surface
previewSurface);
}
private final List<Surface> mOutputSurfaces;
private final CaptureSessionCreator mCaptureSessionCreator;
private final CameraCaptureSessionCreatedListener mSessionListener;
/**
* @param outputSurfaces The set of output surfaces (except for the preview
* surface) to use.
* @param captureSessionCreator
* @param sessionListener A callback to be invoked when the capture session
* has been created. It is executed on threadPoolExecutor.
*/
public PreviewStarter(List<Surface> outputSurfaces,
CaptureSessionCreator captureSessionCreator,
CameraCaptureSessionCreatedListener sessionListener) {
mOutputSurfaces = outputSurfaces;
mCaptureSessionCreator = captureSessionCreator;
mSessionListener = sessionListener;
}
/**
* See {@link OneCamera#startPreview}.
*
* @param surface The preview surface to use.
*/
public ListenableFuture<Void> startPreview(final Surface surface) {
// When we have the preview surface, start the capture session.
List<Surface> surfaceList = new ArrayList<Surface>(mOutputSurfaces);
surfaceList.add(surface);
final ListenableFuture<CameraCaptureSessionProxy> sessionFuture =
mCaptureSessionCreator.createCaptureSession(surfaceList);
return Futures.transform(sessionFuture,
new AsyncFunction<CameraCaptureSessionProxy, Void>() {
@Override
public ListenableFuture<Void> apply(
CameraCaptureSessionProxy captureSession) throws Exception {
mSessionListener.onCameraCaptureSessionCreated(captureSession, surface);
return Futures.immediateFuture(null);
}
});
}
}
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