CameraDeviceBase.h revision 7b82efe7a376c882f8f938e1c41b8311a8cdda4a 
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_CAMERADEVICEBASE_H
18#define ANDROID_SERVERS_CAMERA_CAMERADEVICEBASE_H
19
20#include <utils/RefBase.h>
21#include <utils/String8.h>
22#include <utils/String16.h>
23#include <utils/Vector.h>
24#include <utils/Timers.h>
25
26#include "hardware/camera2.h"
27#include "camera/CameraMetadata.h"
28
29namespace android {
30
31/**
32 * Base interface for version >= 2 camera device classes, which interface to
33 * camera HAL device versions >= 2.
34 */
35class CameraDeviceBase : public virtual RefBase {
36  public:
37    virtual ~CameraDeviceBase();
38
39    /**
40     * The device's camera ID
41     */
42    virtual int      getId() const = 0;
43
44    virtual status_t initialize(camera_module_t *module) = 0;
45    virtual status_t disconnect() = 0;
46
47    virtual status_t dump(int fd, const Vector<String16>& args) = 0;
48
49    /**
50     * The device's static characteristics metadata buffer
51     */
52    virtual const CameraMetadata& info() const = 0;
53
54    /**
55     * Submit request for capture. The CameraDevice takes ownership of the
56     * passed-in buffer.
57     */
58    virtual status_t capture(CameraMetadata &request) = 0;
59
60    /**
61     * Submit request for streaming. The CameraDevice makes a copy of the
62     * passed-in buffer and the caller retains ownership.
63     */
64    virtual status_t setStreamingRequest(const CameraMetadata &request) = 0;
65
66    /**
67     * Clear the streaming request slot.
68     */
69    virtual status_t clearStreamingRequest() = 0;
70
71    /**
72     * Wait until a request with the given ID has been dequeued by the
73     * HAL. Returns TIMED_OUT if the timeout duration is reached. Returns
74     * immediately if the latest request received by the HAL has this id.
75     */
76    virtual status_t waitUntilRequestReceived(int32_t requestId,
77            nsecs_t timeout) = 0;
78
79    /**
80     * Create an output stream of the requested size and format.
81     *
82     * If format is CAMERA2_HAL_PIXEL_FORMAT_OPAQUE, then the HAL device selects
83     * an appropriate format; it can be queried with getStreamInfo.
84     *
85     * If format is HAL_PIXEL_FORMAT_COMPRESSED, the size parameter must be
86     * equal to the size in bytes of the buffers to allocate for the stream. For
87     * other formats, the size parameter is ignored.
88     */
89    virtual status_t createStream(sp<ANativeWindow> consumer,
90            uint32_t width, uint32_t height, int format, size_t size,
91            int *id) = 0;
92
93    /**
94     * Create an input reprocess stream that uses buffers from an existing
95     * output stream.
96     */
97    virtual status_t createReprocessStreamFromStream(int outputId, int *id) = 0;
98
99    /**
100     * Get information about a given stream.
101     */
102    virtual status_t getStreamInfo(int id,
103            uint32_t *width, uint32_t *height, uint32_t *format) = 0;
104
105    /**
106     * Set stream gralloc buffer transform
107     */
108    virtual status_t setStreamTransform(int id, int transform) = 0;
109
110    /**
111     * Delete stream. Must not be called if there are requests in flight which
112     * reference that stream.
113     */
114    virtual status_t deleteStream(int id) = 0;
115
116    /**
117     * Delete reprocess stream. Must not be called if there are requests in
118     * flight which reference that stream.
119     */
120    virtual status_t deleteReprocessStream(int id) = 0;
121
122    /**
123     * Create a metadata buffer with fields that the HAL device believes are
124     * best for the given use case
125     */
126    virtual status_t createDefaultRequest(int templateId,
127            CameraMetadata *request) = 0;
128
129    /**
130     * Wait until all requests have been processed. Returns INVALID_OPERATION if
131     * the streaming slot is not empty, or TIMED_OUT if the requests haven't
132     * finished processing in 10 seconds.
133     */
134    virtual status_t waitUntilDrained() = 0;
135
136    /**
137     * Abstract class for HAL notification listeners
138     */
139    class NotificationListener {
140      public:
141        // Refer to the Camera2 HAL definition for notification definitions
142        virtual void notifyError(int errorCode, int arg1, int arg2) = 0;
143        virtual void notifyShutter(int frameNumber, nsecs_t timestamp) = 0;
144        virtual void notifyAutoFocus(uint8_t newState, int triggerId) = 0;
145        virtual void notifyAutoExposure(uint8_t newState, int triggerId) = 0;
146        virtual void notifyAutoWhitebalance(uint8_t newState,
147                int triggerId) = 0;
148      protected:
149        virtual ~NotificationListener();
150    };
151
152    /**
153     * Connect HAL notifications to a listener. Overwrites previous
154     * listener. Set to NULL to stop receiving notifications.
155     */
156    virtual status_t setNotifyCallback(NotificationListener *listener) = 0;
157
158    /**
159     * Whether the device supports calling notifyAutofocus, notifyAutoExposure,
160     * and notifyAutoWhitebalance; if this returns false, the client must
161     * synthesize these notifications from received frame metadata.
162     */
163    virtual bool     willNotify3A() = 0;
164
165    /**
166     * Wait for a new frame to be produced, with timeout in nanoseconds.
167     * Returns TIMED_OUT when no frame produced within the specified duration
168     */
169    virtual status_t waitForNextFrame(nsecs_t timeout) = 0;
170
171    /**
172     * Get next metadata frame from the frame queue. Returns NULL if the queue
173     * is empty; caller takes ownership of the metadata buffer.
174     */
175    virtual status_t getNextFrame(CameraMetadata *frame) = 0;
176
177    /**
178     * Trigger auto-focus. The latest ID used in a trigger autofocus or cancel
179     * autofocus call will be returned by the HAL in all subsequent AF
180     * notifications.
181     */
182    virtual status_t triggerAutofocus(uint32_t id) = 0;
183
184    /**
185     * Cancel auto-focus. The latest ID used in a trigger autofocus/cancel
186     * autofocus call will be returned by the HAL in all subsequent AF
187     * notifications.
188     */
189    virtual status_t triggerCancelAutofocus(uint32_t id) = 0;
190
191    /**
192     * Trigger pre-capture metering. The latest ID used in a trigger pre-capture
193     * call will be returned by the HAL in all subsequent AE and AWB
194     * notifications.
195     */
196    virtual status_t triggerPrecaptureMetering(uint32_t id) = 0;
197
198    /**
199     * Abstract interface for clients that want to listen to reprocess buffer
200     * release events
201     */
202    struct BufferReleasedListener : public virtual RefBase {
203        virtual void onBufferReleased(buffer_handle_t *handle) = 0;
204    };
205
206    /**
207     * Push a buffer to be reprocessed into a reprocessing stream, and
208     * provide a listener to call once the buffer is returned by the HAL
209     */
210    virtual status_t pushReprocessBuffer(int reprocessStreamId,
211            buffer_handle_t *buffer, wp<BufferReleasedListener> listener) = 0;
212};
213
214}; // namespace android
215
216#endif
217