AudioTrackShared.h revision 89fa4ad53f2f4d57adbc97ae1149fc00c9b6f3c5
1/* 2 * Copyright (C) 2007 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_TRACK_SHARED_H 18#define ANDROID_AUDIO_TRACK_SHARED_H 19 20#include <stdint.h> 21#include <sys/types.h> 22 23#include <utils/threads.h> 24 25namespace android { 26 27// ---------------------------------------------------------------------------- 28 29#define MAX_SAMPLE_RATE 65535 30#define THREAD_PRIORITY_AUDIO_CLIENT (ANDROID_PRIORITY_AUDIO) 31// Maximum cumulated timeout milliseconds before restarting audioflinger thread 32#define MAX_STARTUP_TIMEOUT_MS 3000 // Longer timeout period at startup to cope with A2DP init time 33#define MAX_RUN_TIMEOUT_MS 1000 34#define WAIT_PERIOD_MS 10 35 36 37struct audio_track_cblk_t 38{ 39 40 // The data members are grouped so that members accessed frequently and in the same context 41 // are in the same line of data cache. 42 Mutex lock; 43 Condition cv; 44 volatile uint32_t user; 45 volatile uint32_t server; 46 uint32_t userBase; 47 uint32_t serverBase; 48 void* buffers; 49 uint32_t frameCount; 50 // Cache line boundary 51 uint32_t loopStart; 52 uint32_t loopEnd; 53 int loopCount; 54 volatile union { 55 uint16_t volume[2]; 56 uint32_t volumeLR; 57 }; 58 uint16_t sampleRate; 59 uint16_t channels; 60 int16_t flowControlFlag; // underrun (out) or overrrun (in) indication 61 uint8_t out; // out equals 1 for AudioTrack and 0 for AudioRecord 62 uint8_t forceReady; 63 uint16_t bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger 64 uint16_t waitTimeMs; // Cumulated wait time 65 // Padding ensuring that data buffer starts on a cache line boundary (32 bytes). 66 // See AudioFlinger::TrackBase constructor 67 int32_t Padding[3]; 68 69 audio_track_cblk_t(); 70 uint32_t stepUser(uint32_t frameCount); 71 bool stepServer(uint32_t frameCount); 72 void* buffer(uint32_t offset) const; 73 uint32_t framesAvailable(); 74 uint32_t framesAvailable_l(); 75 uint32_t framesReady(); 76}; 77 78 79// ---------------------------------------------------------------------------- 80 81}; // namespace android 82 83#endif // ANDROID_AUDIO_TRACK_SHARED_H 84