Camera3IOStreamBase.h revision f1e98d857ec377f2c9b916073d40732e6ebb7ced 
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            mDequeuedBufferCount;
52    Condition         mBufferReturnedSignal;
53    uint32_t          mFrameCount;
54    // Last received output buffer's timestamp
55    nsecs_t           mLastTimestamp;
56
57    // The merged release fence for all returned buffers
58    sp<Fence>         mCombinedFence;
59
60    status_t         returnAnyBufferLocked(
61            const camera3_stream_buffer &buffer,
62            nsecs_t timestamp,
63            bool output);
64
65    virtual status_t returnBufferCheckedLocked(
66            const camera3_stream_buffer &buffer,
67            nsecs_t timestamp,
68            bool output,
69            /*out*/
70            sp<Fence> *releaseFenceOut) = 0;
71
72    /**
73     * Internal Camera3Stream interface
74     */
75    virtual bool     hasOutstandingBuffersLocked() const;
76
77    virtual size_t   getBufferCountLocked();
78
79    virtual status_t getEndpointUsage(uint32_t *usage) = 0;
80
81    status_t getBufferPreconditionCheckLocked() const;
82    status_t returnBufferPreconditionCheckLocked() const;
83
84    // State check only
85    virtual status_t configureQueueLocked();
86    // State checks only
87    virtual status_t disconnectLocked();
88
89    // Hand out the buffer to a native location,
90    //   incrementing the internal refcount and dequeued buffer count
91    void handoutBufferLocked(camera3_stream_buffer &buffer,
92                             buffer_handle_t *handle,
93                             int acquire_fence,
94                             int release_fence,
95                             camera3_buffer_status_t status);
96
97}; // class Camera3IOStreamBase
98
99} // namespace camera3
100
101} // namespace android
102
103#endif
104