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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_AAUDIO_AAUDIO_SERVICE_MESSAGE_H
     18 #define ANDROID_AAUDIO_AAUDIO_SERVICE_MESSAGE_H
     19 
     20 #include <stdint.h>
     21 
     22 #include <aaudio/AAudio.h>
     23 
     24 namespace aaudio {
     25 
     26 // TODO move this to an "include" folder for the service.
     27 
     28 // Used to send information about the HAL to the client.
     29 struct AAudioMessageTimestamp {
     30     int64_t position;     // number of frames transferred so far
     31     int64_t timestamp;    // time when that position was reached
     32 };
     33 
     34 typedef enum aaudio_service_event_e : uint32_t {
     35     AAUDIO_SERVICE_EVENT_STARTED,
     36     AAUDIO_SERVICE_EVENT_PAUSED,
     37     AAUDIO_SERVICE_EVENT_STOPPED,
     38     AAUDIO_SERVICE_EVENT_FLUSHED,
     39     AAUDIO_SERVICE_EVENT_DISCONNECTED,
     40     AAUDIO_SERVICE_EVENT_VOLUME,
     41     AAUDIO_SERVICE_EVENT_XRUN
     42 } aaudio_service_event_t;
     43 
     44 struct AAudioMessageEvent {
     45     aaudio_service_event_t event;
     46     union {
     47         double  dataDouble;
     48         int64_t dataLong;
     49     };
     50 };
     51 
     52 typedef struct AAudioServiceMessage_s {
     53     enum class code : uint32_t {
     54         NOTHING,
     55         TIMESTAMP_SERVICE, // when frame is read or written by the service to the client
     56         TIMESTAMP_HARDWARE, // when frame is at DAC or ADC
     57         EVENT,
     58     };
     59 
     60     code what;
     61     union {
     62         AAudioMessageTimestamp timestamp; // what == TIMESTAMP
     63         AAudioMessageEvent event;         // what == EVENT
     64     };
     65 } AAudioServiceMessage;
     66 
     67 } /* namespace aaudio */
     68 
     69 #endif //ANDROID_AAUDIO_AAUDIO_SERVICE_MESSAGE_H
     70