Add framework support for camcorder zoom.

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().

bug:2644213

Change-Id: I15269397defc25cbbcae16abc071c8349c123122

1 files changed, 24 insertions, 22 deletions

diff --git a/include/media/IMediaRecorder.h b/include/media/IMediaRecorder.h
index 28be7c1..a73267d 100644
--- a/include/media/IMediaRecorder.h
+++ b/include/media/IMediaRecorder.h
@@ -24,6 +24,7 @@ namespace android {
 
 class Surface;
 class ICamera;
+class ICameraRecordingProxy;
 class IMediaRecorderClient;
 
 class IMediaRecorder: public IInterface
@@ -31,28 +32,29 @@ class IMediaRecorder: public IInterface
 public:
     DECLARE_META_INTERFACE(MediaRecorder);
 
-    virtual	status_t		setCamera(const sp<ICamera>& camera) = 0;
-    virtual	status_t		setPreviewSurface(const sp<Surface>& surface) = 0;
-    virtual	status_t		setVideoSource(int vs) = 0;
-    virtual	status_t		setAudioSource(int as) = 0;
-    virtual	status_t		setOutputFormat(int of) = 0;
-    virtual	status_t		setVideoEncoder(int ve) = 0;
-    virtual	status_t		setAudioEncoder(int ae) = 0;
-    virtual	status_t		setOutputFile(const char* path) = 0;
-    virtual	status_t		setOutputFile(int fd, int64_t offset, int64_t length) = 0;
-    virtual	status_t		setOutputFileAuxiliary(int fd) = 0;
-    virtual	status_t		setVideoSize(int width, int height) = 0;
-    virtual	status_t		setVideoFrameRate(int frames_per_second) = 0;
-    virtual     status_t                setParameters(const String8& params) = 0;
-    virtual     status_t                setListener(const sp<IMediaRecorderClient>& listener) = 0;
-    virtual	status_t		prepare() = 0;
-    virtual	status_t		getMaxAmplitude(int* max) = 0;
-    virtual	status_t		start() = 0;
-    virtual	status_t		stop() = 0;
-    virtual	status_t		reset() = 0;
-    virtual status_t        init() = 0;
-    virtual status_t        close() = 0;
-    virtual	status_t		release() = 0;
+    virtual status_t setCamera(const sp<ICamera>& camera,
+                               const sp<ICameraRecordingProxy>& proxy) = 0;
+    virtual status_t setPreviewSurface(const sp<Surface>& surface) = 0;
+    virtual status_t setVideoSource(int vs) = 0;
+    virtual status_t setAudioSource(int as) = 0;
+    virtual status_t setOutputFormat(int of) = 0;
+    virtual status_t setVideoEncoder(int ve) = 0;
+    virtual status_t setAudioEncoder(int ae) = 0;
+    virtual status_t setOutputFile(const char* path) = 0;
+    virtual status_t setOutputFile(int fd, int64_t offset, int64_t length) = 0;
+    virtual status_t setOutputFileAuxiliary(int fd) = 0;
+    virtual status_t setVideoSize(int width, int height) = 0;
+    virtual status_t setVideoFrameRate(int frames_per_second) = 0;
+    virtual status_t setParameters(const String8& params) = 0;
+    virtual status_t setListener(const sp<IMediaRecorderClient>& listener) = 0;
+    virtual status_t prepare() = 0;
+    virtual status_t getMaxAmplitude(int* max) = 0;
+    virtual status_t start() = 0;
+    virtual status_t stop() = 0;
+    virtual status_t reset() = 0;
+    virtual status_t init() = 0;
+    virtual status_t close() = 0;
+    virtual status_t release() = 0;
 };
 
 // ----------------------------------------------------------------------------