CameraSource.h revision 54ff19ac69ace7c05ea90d225e26dab3b133f487 
1/*
2 * Copyright (C) 2009 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 CAMERA_SOURCE_H_
18
19#define CAMERA_SOURCE_H_
20
21#include <media/stagefright/MediaBuffer.h>
22#include <media/stagefright/MediaSource.h>
23#include <camera/ICamera.h>
24#include <camera/CameraParameters.h>
25#include <utils/List.h>
26#include <utils/RefBase.h>
27
28namespace android {
29
30class IMemory;
31class Camera;
32class Surface;
33
34class CameraSource : public MediaSource, public MediaBufferObserver {
35public:
36    /**
37     * Factory method to create a new CameraSource using the current
38     * settings (such as video size, frame rate, color format, etc)
39     * from the default camera.
40     *
41     * @return NULL on error.
42     */
43    static CameraSource *Create();
44
45    /**
46     * Factory method to create a new CameraSource.
47     *
48     * @param camera the video input frame data source. If it is NULL,
49     *          we will try to connect to the camera with the given
50     *          cameraId.
51     *
52     * @param cameraId the id of the camera that the source will connect
53     *          to if camera is NULL; otherwise ignored.
54     *
55     * @param videoSize the dimension (in pixels) of the video frame
56     * @param frameRate the target frames per second
57     * @param surface the preview surface for display where preview
58     *          frames are sent to
59     *
60     * @return NULL on error.
61     */
62    static CameraSource *CreateFromCamera(const sp<ICamera> &camera,
63                                          int32_t cameraId,
64                                          Size videoSize,
65                                          int32_t frameRate,
66                                          const sp<Surface>& surface);
67
68    virtual ~CameraSource();
69
70    virtual status_t start(MetaData *params = NULL);
71    virtual status_t stop();
72
73    /**
74     * Check whether a CameraSource object is properly initialized.
75     * Must call this method before stop().
76     * @return OK if initialization has successfully completed.
77     */
78    virtual status_t initCheck() const;
79
80    /**
81     * Returns the MetaData associated with the CameraSource,
82     * including:
83     * kKeyColorFormat: YUV color format of the video frames
84     * kKeyWidth, kKeyHeight: dimension (in pixels) of the video frames
85     * kKeySampleRate: frame rate in frames per second
86     * kKeyMimeType: always fixed
87     */
88    virtual sp<MetaData> getFormat();
89
90    virtual status_t read(
91            MediaBuffer **buffer, const ReadOptions *options = NULL);
92
93    virtual void signalBufferReturned(MediaBuffer* buffer);
94
95protected:
96    enum CameraFlags {
97        FLAGS_SET_CAMERA = 1L << 0,
98        FLAGS_HOT_CAMERA = 1L << 1,
99    };
100
101    int32_t  mCameraFlags;
102    Size     mVideoSize;
103    int32_t  mVideoFrameRate;
104    int32_t  mColorFormat;
105    status_t mInitCheck;
106
107    sp<Camera>   mCamera;
108    sp<Surface>  mSurface;
109    sp<MetaData> mMeta;
110
111    int64_t mStartTimeUs;
112    int32_t mNumFramesReceived;
113    int64_t mLastFrameTimestampUs;
114    bool mStarted;
115
116    CameraSource(const sp<ICamera>& camera, int32_t cameraId,
117                 Size videoSize, int32_t frameRate,
118                 const sp<Surface>& surface);
119
120    virtual void startCameraRecording();
121    virtual void stopCameraRecording();
122    virtual void releaseRecordingFrame(const sp<IMemory>& frame);
123
124    // Returns true if need to skip the current frame.
125    // Called from dataCallbackTimestamp.
126    virtual bool skipCurrentFrame(int64_t timestampUs) {return false;}
127
128    // Callback called when still camera raw data is available.
129    virtual void dataCallback(int32_t msgType, const sp<IMemory> &data) {}
130
131    virtual void dataCallbackTimestamp(int64_t timestampUs, int32_t msgType,
132            const sp<IMemory> &data);
133
134private:
135    friend class CameraSourceListener;
136
137    Mutex mLock;
138    Condition mFrameAvailableCondition;
139    Condition mFrameCompleteCondition;
140    List<sp<IMemory> > mFramesReceived;
141    List<sp<IMemory> > mFramesBeingEncoded;
142    List<int64_t> mFrameTimes;
143
144    int64_t mFirstFrameTimeUs;
145    int32_t mNumFramesEncoded;
146    int32_t mNumFramesDropped;
147    int32_t mNumGlitches;
148    int64_t mGlitchDurationThresholdUs;
149    bool mCollectStats;
150
151    void releaseQueuedFrames();
152    void releaseOneRecordingFrame(const sp<IMemory>& frame);
153
154
155    status_t init(const sp<ICamera>& camera, int32_t cameraId,
156                Size videoSize, int32_t frameRate);
157    status_t isCameraAvailable(const sp<ICamera>& camera, int32_t cameraId);
158    status_t isCameraColorFormatSupported(const CameraParameters& params);
159    status_t configureCamera(CameraParameters* params,
160                    int32_t width, int32_t height,
161                    int32_t frameRate);
162
163    status_t checkVideoSize(const CameraParameters& params,
164                    int32_t width, int32_t height);
165
166    status_t checkFrameRate(const CameraParameters& params,
167                    int32_t frameRate);
168
169    CameraSource(const CameraSource &);
170    CameraSource &operator=(const CameraSource &);
171};
172
173}  // namespace android
174
175#endif  // CAMERA_SOURCE_H_
176