Camera3IOStreamBase.h revision 6adc9ccb2948d9421a0ed4b74f52b909bcec2037 
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_CAMERA3_IO_STREAM_BASE_H
18#define ANDROID_SERVERS_CAMERA3_IO_STREAM_BASE_H
19
20#include <utils/RefBase.h>
21#include <gui/Surface.h>
22
23#include "Camera3Stream.h"
24
25namespace android {
26
27namespace camera3 {
28
29/**
30 * A base class for managing a single stream of I/O data from the camera device.
31 */
32class Camera3IOStreamBase :
33        public Camera3Stream {
34  protected:
35    Camera3IOStreamBase(int id, camera3_stream_type_t type,
36            uint32_t width, uint32_t height, size_t maxSize, int format);
37
38  public:
39
40    virtual ~Camera3IOStreamBase();
41
42    /**
43     * Camera3Stream interface
44     */
45
46    virtual void     dump(int fd, const Vector<String16> &args) const;
47
48  protected:
49    size_t            mTotalBufferCount;
50    // sum of input and output buffers that are currently acquired by HAL
51    size_t            mHandoutTotalBufferCount;
52    // number of output buffers that are currently acquired by HAL. This will be
53    // Redundant when camera3 streams are no longer bidirectional streams.
54    size_t            mHandoutOutputBufferCount;
55    Condition         mBufferReturnedSignal;
56    uint32_t          mFrameCount;
57    // Last received output buffer's timestamp
58    nsecs_t           mLastTimestamp;
59
60    // The merged release fence for all returned buffers
61    sp<Fence>         mCombinedFence;
62
63    status_t         returnAnyBufferLocked(
64            const camera3_stream_buffer &buffer,
65            nsecs_t timestamp,
66            bool output);
67
68    virtual status_t returnBufferCheckedLocked(
69            const camera3_stream_buffer &buffer,
70            nsecs_t timestamp,
71            bool output,
72            /*out*/
73            sp<Fence> *releaseFenceOut) = 0;
74
75    /**
76     * Internal Camera3Stream interface
77     */
78    virtual bool     hasOutstandingBuffersLocked() const;
79
80    virtual size_t   getBufferCountLocked();
81
82    virtual size_t   getHandoutOutputBufferCountLocked();
83
84    virtual size_t   getHandoutInputBufferCountLocked();
85
86    virtual status_t getEndpointUsage(uint32_t *usage) = 0;
87
88    status_t getBufferPreconditionCheckLocked() const;
89    status_t returnBufferPreconditionCheckLocked() const;
90
91    // State check only
92    virtual status_t configureQueueLocked();
93    // State checks only
94    virtual status_t disconnectLocked();
95
96    // Hand out the buffer to a native location,
97    //   incrementing the internal refcount and dequeued buffer count
98    void handoutBufferLocked(camera3_stream_buffer &buffer,
99                             buffer_handle_t *handle,
100                             int acquire_fence,
101                             int release_fence,
102                             camera3_buffer_status_t status,
103                             bool output);
104
105}; // class Camera3IOStreamBase
106
107} // namespace camera3
108
109} // namespace android
110
111#endif
112