AudioTrackShared.h revision 1703cdfee717b1b312bf8979816a9e2f16a82e5d
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 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#define RESTORE_TIMEOUT_MS 5000 // Maximum waiting time for a track to be restored 35 36#define CBLK_UNDERRUN_MSK 0x0001 37#define CBLK_UNDERRUN_ON 0x0001 // underrun (out) or overrrun (in) indication 38#define CBLK_UNDERRUN_OFF 0x0000 // no underrun 39#define CBLK_DIRECTION_MSK 0x0002 40#define CBLK_DIRECTION_OUT 0x0002 // this cblk is for an AudioTrack 41#define CBLK_DIRECTION_IN 0x0000 // this cblk is for an AudioRecord 42#define CBLK_FORCEREADY_MSK 0x0004 43#define CBLK_FORCEREADY_ON 0x0004 // track is considered ready immediately by AudioFlinger 44#define CBLK_FORCEREADY_OFF 0x0000 // track is ready when buffer full 45#define CBLK_INVALID_MSK 0x0008 46#define CBLK_INVALID_ON 0x0008 // track buffer is invalidated by AudioFlinger: 47#define CBLK_INVALID_OFF 0x0000 // must be re-created 48#define CBLK_DISABLED_MSK 0x0010 49#define CBLK_DISABLED_ON 0x0010 // track disabled by AudioFlinger due to underrun: 50#define CBLK_DISABLED_OFF 0x0000 // must be re-started 51#define CBLK_RESTORING_MSK 0x0020 52#define CBLK_RESTORING_ON 0x0020 // track is being restored after invalidation 53#define CBLK_RESTORING_OFF 0x0000 // by AudioFlinger 54#define CBLK_RESTORED_MSK 0x0040 55#define CBLK_RESTORED_ON 0x0040 // track has been restored after invalidation 56#define CBLK_RESTORED_OFF 0x0040 // by AudioFlinger 57 58struct audio_track_cblk_t 59{ 60 61 // The data members are grouped so that members accessed frequently and in the same context 62 // are in the same line of data cache. 63 Mutex lock; 64 Condition cv; 65 volatile uint32_t user; 66 volatile uint32_t server; 67 uint32_t userBase; 68 uint32_t serverBase; 69 void* buffers; 70 uint32_t frameCount; 71 // Cache line boundary 72 uint32_t loopStart; 73 uint32_t loopEnd; 74 int loopCount; 75 volatile union { 76 uint16_t volume[2]; 77 uint32_t volumeLR; 78 }; 79 uint32_t sampleRate; 80 // NOTE: audio_track_cblk_t::frameSize is not equal to AudioTrack::frameSize() for 81 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of 82 // 16 bit because data is converted to 16 bit before being stored in buffer 83 84 uint8_t frameSize; 85 uint8_t channelCount; 86 uint16_t flags; 87 88 uint16_t bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger 89 uint16_t waitTimeMs; // Cumulated wait time 90 91 uint16_t sendLevel; 92 uint16_t reserved; 93 // Cache line boundary (32 bytes) 94 audio_track_cblk_t(); 95 uint32_t stepUser(uint32_t frameCount); 96 bool stepServer(uint32_t frameCount); 97 void* buffer(uint32_t offset) const; 98 uint32_t framesAvailable(); 99 uint32_t framesAvailable_l(); 100 uint32_t framesReady(); 101}; 102 103 104// ---------------------------------------------------------------------------- 105 106}; // namespace android 107 108#endif // ANDROID_AUDIO_TRACK_SHARED_H 109