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 // Align so that 32 and 64-bit code can exchange messages through shared memory. 48 alignas(8) 49 double dataDouble; 50 int64_t dataLong; 51 }; 52 }; 53 54 typedef struct AAudioServiceMessage_s { 55 enum class code : uint32_t { 56 NOTHING, 57 TIMESTAMP_SERVICE, // when frame is read or written by the service to the client 58 TIMESTAMP_HARDWARE, // when frame is at DAC or ADC 59 EVENT, 60 }; 61 62 code what; 63 union { 64 // Align so that 32 and 64-bit code can exchange messages through shared memory. 65 alignas(8) 66 AAudioMessageTimestamp timestamp; // what == TIMESTAMP 67 AAudioMessageEvent event; // what == EVENT 68 }; 69 } AAudioServiceMessage; 70 71 } /* namespace aaudio */ 72 73 #endif //ANDROID_AAUDIO_AAUDIO_SERVICE_MESSAGE_H 74