FrameProcessorBase.h revision 215bb3499c7eeea6303e55fac66452f2574c022a 
1/*
2 * Copyright (C) 2013 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_SERVERS_CAMERA_CAMERA2_PROFRAMEPROCESSOR_H
18#define ANDROID_SERVERS_CAMERA_CAMERA2_PROFRAMEPROCESSOR_H
19
20#include <utils/Thread.h>
21#include <utils/String16.h>
22#include <utils/Vector.h>
23#include <utils/KeyedVector.h>
24#include <utils/List.h>
25#include <camera/CameraMetadata.h>
26
27namespace android {
28
29class CameraDeviceBase;
30
31namespace camera2 {
32
33/* Output frame metadata processing thread.  This thread waits for new
34 * frames from the device, and analyzes them as necessary.
35 */
36class FrameProcessorBase: public Thread {
37  public:
38    FrameProcessorBase(wp<CameraDeviceBase> device);
39    virtual ~FrameProcessorBase();
40
41    struct FilteredListener: virtual public RefBase {
42        virtual void onFrameAvailable(int32_t requestId,
43                                      const CameraMetadata &frame) = 0;
44    };
45
46    // Register a listener for a range of IDs [minId, maxId). Multiple listeners
47    // can be listening to the same range
48    status_t registerListener(int32_t minId, int32_t maxId,
49                              wp<FilteredListener> listener);
50    status_t removeListener(int32_t minId, int32_t maxId,
51                            wp<FilteredListener> listener);
52
53    void dump(int fd, const Vector<String16>& args);
54  protected:
55    static const nsecs_t kWaitDuration = 10000000; // 10 ms
56    wp<CameraDeviceBase> mDevice;
57
58    virtual bool threadLoop();
59
60    Mutex mInputMutex;
61    Mutex mLastFrameMutex;
62
63    struct RangeListener {
64        int32_t minId;
65        int32_t maxId;
66        wp<FilteredListener> listener;
67    };
68    List<RangeListener> mRangeListeners;
69
70    void processNewFrames(const sp<CameraDeviceBase> &device);
71
72    virtual bool processSingleFrame(CameraMetadata &frame,
73                                    const sp<CameraDeviceBase> &device);
74
75    status_t processListeners(const CameraMetadata &frame,
76                              const sp<CameraDeviceBase> &device);
77
78    CameraMetadata mLastFrame;
79};
80
81
82}; //namespace camera2
83}; //namespace android
84
85#endif
86