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      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 
     24 namespace android {
     25 
     26 
     27 class 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