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 // Maximum cumulated timeout milliseconds before restarting audioflinger thread 30 #define MAX_STARTUP_TIMEOUT_MS 3000 // Longer timeout period at startup to cope with A2DP init time 31 #define MAX_RUN_TIMEOUT_MS 1000 32 #define WAIT_PERIOD_MS 10 33 #define RESTORE_TIMEOUT_MS 5000 // Maximum waiting time for a track to be restored 34 35 #define CBLK_UNDERRUN_MSK 0x0001 36 #define CBLK_UNDERRUN_ON 0x0001 // underrun (out) or overrrun (in) indication 37 #define CBLK_UNDERRUN_OFF 0x0000 // no underrun 38 #define CBLK_DIRECTION_MSK 0x0002 39 #define CBLK_DIRECTION_OUT 0x0002 // this cblk is for an AudioTrack 40 #define CBLK_DIRECTION_IN 0x0000 // this cblk is for an AudioRecord 41 #define CBLK_FORCEREADY_MSK 0x0004 42 #define CBLK_FORCEREADY_ON 0x0004 // track is considered ready immediately by AudioFlinger 43 #define CBLK_FORCEREADY_OFF 0x0000 // track is ready when buffer full 44 #define CBLK_INVALID_MSK 0x0008 45 #define CBLK_INVALID_ON 0x0008 // track buffer is invalidated by AudioFlinger: 46 #define CBLK_INVALID_OFF 0x0000 // must be re-created 47 #define CBLK_DISABLED_MSK 0x0010 48 #define CBLK_DISABLED_ON 0x0010 // track disabled by AudioFlinger due to underrun: 49 #define CBLK_DISABLED_OFF 0x0000 // must be re-started 50 #define CBLK_RESTORING_MSK 0x0020 51 #define CBLK_RESTORING_ON 0x0020 // track is being restored after invalidation 52 #define CBLK_RESTORING_OFF 0x0000 // by AudioFlinger 53 #define CBLK_RESTORED_MSK 0x0040 54 #define CBLK_RESTORED_ON 0x0040 // track has been restored after invalidation 55 #define CBLK_RESTORED_OFF 0x0040 // by AudioFlinger 56 57 struct audio_track_cblk_t 58 { 59 60 // The data members are grouped so that members accessed frequently and in the same context 61 // are in the same line of data cache. 62 Mutex lock; 63 Condition cv; 64 volatile uint32_t user; 65 volatile uint32_t server; 66 uint32_t userBase; 67 uint32_t serverBase; 68 void* buffers; 69 uint32_t frameCount; 70 // Cache line boundary 71 uint32_t loopStart; 72 uint32_t loopEnd; 73 int loopCount; 74 volatile union { 75 uint16_t volume[2]; 76 uint32_t volumeLR; 77 }; 78 uint32_t sampleRate; 79 // NOTE: audio_track_cblk_t::frameSize is not equal to AudioTrack::frameSize() for 80 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of 81 // 16 bit because data is converted to 16 bit before being stored in buffer 82 83 uint8_t frameSize; 84 uint8_t pad1; 85 uint16_t bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger 86 87 uint16_t waitTimeMs; // Cumulated wait time 88 uint16_t sendLevel; 89 volatile int32_t flags; 90 91 // Cache line boundary (32 bytes) 92 93 audio_track_cblk_t(); 94 uint32_t stepUser(uint32_t frameCount); 95 bool stepServer(uint32_t frameCount); 96 void* buffer(uint32_t offset) const; 97 uint32_t framesAvailable(); 98 uint32_t framesAvailable_l(); 99 uint32_t framesReady(); 100 bool tryLock(); 101 }; 102 103 104 // ---------------------------------------------------------------------------- 105 106 }; // namespace android 107 108 #endif // ANDROID_AUDIO_TRACK_SHARED_H 109