1/*
2 * Copyright (C) 2016 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_AUDIO_MMAP_STREAM_CALLBACK_H
18#define ANDROID_AUDIO_MMAP_STREAM_CALLBACK_H
19
20#include <system/audio.h>
21#include <utils/Errors.h>
22#include <utils/RefBase.h>
23
24namespace android {
25
26
27class MmapStreamCallback : public virtual RefBase {
28  public:
29
30    /**
31     * The mmap stream should be torn down because conditions that permitted its creation with
32     * the requested parameters have changed and do not allow it to operate with the requested
33     * constraints any more.
34     */
35    virtual void onTearDown() = 0;
36
37    /**
38     * The volume to be applied to the use case specified when opening the stream has changed
39     * \param[in] channels a channel mask containing all channels the volume should be applied to.
40     * \param[in] values the volume values to be applied to each channel. The size of the vector
41     *                   should correspond to the channel count retrieved with
42     *                   audio_channel_count_from_in_mask() or audio_channel_count_from_out_mask()
43     */
44    virtual void onVolumeChanged(audio_channel_mask_t channels, Vector<float> values) = 0;
45
46    /**
47     * The device the stream is routed to/from has changed
48     * \param[in] onRoutingChanged the unique device ID of the new device.
49     */
50    virtual void onRoutingChanged(audio_port_handle_t deviceId) = 0;
51
52  protected:
53    MmapStreamCallback() {}
54    virtual ~MmapStreamCallback() {}
55};
56
57
58} // namespace android
59
60#endif // ANDROID_AUDIO_MMAP_STREAM_CALLBACK_H
61