1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_HARDWARE_ICAMERA_RECORDING_PROXY_H
18#define ANDROID_HARDWARE_ICAMERA_RECORDING_PROXY_H
19
20#include <binder/IInterface.h>
21#include <cutils/native_handle.h>
22#include <utils/RefBase.h>
23
24namespace android {
25
26class ICameraRecordingProxyListener;
27class IMemory;
28class Parcel;
29
30/*
31 * The purpose of ICameraRecordingProxy and ICameraRecordingProxyListener is to
32 * allow applications using the camera during recording.
33 *
34 * Camera service allows only one client at a time. Since camcorder application
35 * needs to own the camera to do things like zoom, the media recorder cannot
36 * access the camera directly during recording. So ICameraRecordingProxy is a
37 * proxy of ICamera, which allows the media recorder to start/stop the recording
38 * and release recording frames. ICameraRecordingProxyListener is an interface
39 * that allows the recorder to receive video frames during recording.
40 *
41 * ICameraRecordingProxy
42 *   startRecording()
43 *   stopRecording()
44 *   releaseRecordingFrame()
45 *
46 * ICameraRecordingProxyListener
47 *   dataCallbackTimestamp()
48
49 * The camcorder app opens the camera and starts the preview. The app passes
50 * ICamera and ICameraRecordingProxy to the media recorder by
51 * MediaRecorder::setCamera(). The recorder uses ICamera to setup the camera in
52 * MediaRecorder::start(). After setup, the recorder disconnects from camera
53 * service. The recorder calls ICameraRecordingProxy::startRecording() and
54 * passes a ICameraRecordingProxyListener to the app. The app connects back to
55 * camera service and starts the recording. The app owns the camera and can do
56 * things like zoom. The media recorder receives the video frames from the
57 * listener and releases them by ICameraRecordingProxy::releaseRecordingFrame.
58 * The recorder calls ICameraRecordingProxy::stopRecording() to stop the
59 * recording.
60 *
61 * The call sequences are as follows:
62 * 1. The app: Camera.unlock().
63 * 2. The app: MediaRecorder.setCamera().
64 * 3. Start recording
65 *    (1) The app: MediaRecorder.start().
66 *    (2) The recorder: ICamera.unlock() and ICamera.disconnect().
67 *    (3) The recorder: ICameraRecordingProxy.startRecording().
68 *    (4) The app: ICamera.reconnect().
69 *    (5) The app: ICamera.startRecording().
70 * 4. During recording
71 *    (1) The recorder: receive frames from ICameraRecordingProxyListener.dataCallbackTimestamp()
72 *    (2) The recorder: release frames by ICameraRecordingProxy.releaseRecordingFrame().
73 * 5. Stop recording
74 *    (1) The app: MediaRecorder.stop()
75 *    (2) The recorder: ICameraRecordingProxy.stopRecording().
76 *    (3) The app: ICamera.stopRecording().
77 */
78
79class ICameraRecordingProxy: public IInterface
80{
81public:
82    DECLARE_META_INTERFACE(CameraRecordingProxy);
83
84    virtual status_t        startRecording(const sp<ICameraRecordingProxyListener>& listener) = 0;
85    virtual void            stopRecording() = 0;
86    virtual void            releaseRecordingFrame(const sp<IMemory>& mem) = 0;
87    virtual void            releaseRecordingFrameHandle(native_handle_t *handle) = 0;
88};
89
90// ----------------------------------------------------------------------------
91
92class BnCameraRecordingProxy: public BnInterface<ICameraRecordingProxy>
93{
94public:
95    virtual status_t    onTransact( uint32_t code,
96                                    const Parcel& data,
97                                    Parcel* reply,
98                                    uint32_t flags = 0);
99};
100
101}; // namespace android
102
103#endif
104