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 25 namespace android { 26 27 // ---------------------------------------------------------------------------- 28 29 #define THREAD_PRIORITY_AUDIO_CLIENT (ANDROID_PRIORITY_AUDIO) 30 // Maximum cumulated timeout milliseconds before restarting audioflinger thread 31 #define MAX_STARTUP_TIMEOUT_MS 3000 // Longer timeout period at startup to cope with A2DP init time 32 #define MAX_RUN_TIMEOUT_MS 1000 33 #define WAIT_PERIOD_MS 10 34 35 36 struct audio_track_cblk_t 37 { 38 39 // The data members are grouped so that members accessed frequently and in the same context 40 // are in the same line of data cache. 41 Mutex lock; 42 Condition cv; 43 volatile uint32_t user; 44 volatile uint32_t server; 45 uint32_t userBase; 46 uint32_t serverBase; 47 void* buffers; 48 uint32_t frameCount; 49 // Cache line boundary 50 uint32_t loopStart; 51 uint32_t loopEnd; 52 int loopCount; 53 volatile union { 54 uint16_t volume[2]; 55 uint32_t volumeLR; 56 }; 57 uint32_t sampleRate; 58 // NOTE: audio_track_cblk_t::frameSize is not equal to AudioTrack::frameSize() for 59 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of 60 // 16 bit because data is converted to 16 bit before being stored in buffer 61 uint32_t frameSize; 62 uint8_t channels; 63 uint8_t flowControlFlag; // underrun (out) or overrrun (in) indication 64 uint8_t out; // out equals 1 for AudioTrack and 0 for AudioRecord 65 uint8_t forceReady; 66 uint16_t bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger 67 uint16_t waitTimeMs; // Cumulated wait time 68 // Cache line boundary (32 bytes) 69 70 audio_track_cblk_t(); 71 uint32_t stepUser(uint32_t frameCount); 72 bool stepServer(uint32_t frameCount); 73 void* buffer(uint32_t offset) const; 74 uint32_t framesAvailable(); 75 uint32_t framesAvailable_l(); 76 uint32_t framesReady(); 77 }; 78 79 80 // ---------------------------------------------------------------------------- 81 82 }; // namespace android 83 84 #endif // ANDROID_AUDIO_TRACK_SHARED_H 85