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/*
* Copyright (C) 2011 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.
*/
#ifndef ANDROID_HARDWARE_ICAMERA_RECORDING_PROXY_H
#define ANDROID_HARDWARE_ICAMERA_RECORDING_PROXY_H
#include <binder/IInterface.h>
#include <utils/RefBase.h>
namespace android {
class ICameraRecordingProxyListener;
class IMemory;
class Parcel;
/*
* The purpose of ICameraRecordingProxy and ICameraRecordingProxyListener is to
* allow applications using the camera during recording.
*
* Camera service allows only one client at a time. Since camcorder application
* needs to own the camera to do things like zoom, the media recorder cannot
* access the camera directly during recording. So ICameraRecordingProxy is a
* proxy of ICamera, which allows the media recorder to start/stop the recording
* and release recording frames. ICameraRecordingProxyListener is an interface
* that allows the recorder to receive video frames during recording.
*
* ICameraRecordingProxy
* startRecording()
* stopRecording()
* releaseRecordingFrame()
*
* ICameraRecordingProxyListener
* dataCallbackTimestamp()
* The camcorder app opens the camera and starts the preview. The app passes
* ICamera and ICameraRecordingProxy to the media recorder by
* MediaRecorder::setCamera(). The recorder uses ICamera to setup the camera in
* MediaRecorder::start(). After setup, the recorder disconnects from camera
* service. The recorder calls ICameraRecordingProxy::startRecording() and
* passes a ICameraRecordingProxyListener to the app. The app connects back to
* camera service and starts the recording. The app owns the camera and can do
* things like zoom. The media recorder receives the video frames from the
* listener and releases them by ICameraRecordingProxy::releaseRecordingFrame.
* The recorder calls ICameraRecordingProxy::stopRecording() to stop the
* recording.
*
* The call sequences are as follows:
* 1. The app: Camera.unlock().
* 2. The app: MediaRecorder.setCamera().
* 3. Start recording
* (1) The app: MediaRecorder.start().
* (2) The recorder: ICamera.unlock() and ICamera.disconnect().
* (3) The recorder: ICameraRecordingProxy.startRecording().
* (4) The app: ICamera.reconnect().
* (5) The app: ICamera.startRecording().
* 4. During recording
* (1) The recorder: receive frames from ICameraRecordingProxyListener.dataCallbackTimestamp()
* (2) The recorder: release frames by ICameraRecordingProxy.releaseRecordingFrame().
* 5. Stop recording
* (1) The app: MediaRecorder.stop()
* (2) The recorder: ICameraRecordingProxy.stopRecording().
* (3) The app: ICamera.stopRecording().
*/
class ICameraRecordingProxy: public IInterface
{
public:
DECLARE_META_INTERFACE(CameraRecordingProxy);
virtual status_t startRecording(const sp<ICameraRecordingProxyListener>& listener) = 0;
virtual void stopRecording() = 0;
virtual void releaseRecordingFrame(const sp<IMemory>& mem) = 0;
};
// ----------------------------------------------------------------------------
class BnCameraRecordingProxy: public BnInterface<ICameraRecordingProxy>
{
public:
virtual status_t onTransact( uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags = 0);
};
}; // namespace android
#endif
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