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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_AUDIO_TRACK_SHARED_H
#define ANDROID_AUDIO_TRACK_SHARED_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/threads.h>
namespace android {
// ----------------------------------------------------------------------------
// Maximum cumulated timeout milliseconds before restarting audioflinger thread
#define MAX_STARTUP_TIMEOUT_MS 3000 // Longer timeout period at startup to cope with A2DP init time
#define MAX_RUN_TIMEOUT_MS 1000
#define WAIT_PERIOD_MS 10
#define RESTORE_TIMEOUT_MS 5000 // Maximum waiting time for a track to be restored
#define CBLK_UNDERRUN_MSK 0x0001
#define CBLK_UNDERRUN_ON 0x0001 // underrun (out) or overrrun (in) indication
#define CBLK_UNDERRUN_OFF 0x0000 // no underrun
#define CBLK_DIRECTION_MSK 0x0002
#define CBLK_DIRECTION_OUT 0x0002 // this cblk is for an AudioTrack
#define CBLK_DIRECTION_IN 0x0000 // this cblk is for an AudioRecord
#define CBLK_FORCEREADY_MSK 0x0004
#define CBLK_FORCEREADY_ON 0x0004 // track is considered ready immediately by AudioFlinger
#define CBLK_FORCEREADY_OFF 0x0000 // track is ready when buffer full
#define CBLK_INVALID_MSK 0x0008
#define CBLK_INVALID_ON 0x0008 // track buffer is invalidated by AudioFlinger:
#define CBLK_INVALID_OFF 0x0000 // must be re-created
#define CBLK_DISABLED_MSK 0x0010
#define CBLK_DISABLED_ON 0x0010 // track disabled by AudioFlinger due to underrun:
#define CBLK_DISABLED_OFF 0x0000 // must be re-started
#define CBLK_RESTORING_MSK 0x0020
#define CBLK_RESTORING_ON 0x0020 // track is being restored after invalidation
#define CBLK_RESTORING_OFF 0x0000 // by AudioFlinger
#define CBLK_RESTORED_MSK 0x0040
#define CBLK_RESTORED_ON 0x0040 // track has been restored after invalidation
#define CBLK_RESTORED_OFF 0x0040 // by AudioFlinger
struct audio_track_cblk_t
{
// The data members are grouped so that members accessed frequently and in the same context
// are in the same line of data cache.
Mutex lock; // sizeof(int)
Condition cv; // sizeof(int)
volatile uint32_t user;
volatile uint32_t server;
uint32_t userBase;
uint32_t serverBase;
void* buffers;
uint32_t frameCount;
// Cache line boundary
uint32_t loopStart;
uint32_t loopEnd;
int loopCount;
volatile union {
uint16_t volume[2];
uint32_t volumeLR;
};
uint32_t sampleRate;
// NOTE: audio_track_cblk_t::frameSize is not equal to AudioTrack::frameSize() for
// 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of
// 16 bit because data is converted to 16 bit before being stored in buffer
uint8_t frameSize; // would normally be size_t, but 8 bits is plenty
uint8_t pad1;
uint16_t bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger
uint16_t waitTimeMs; // Cumulated wait time
private:
uint16_t mSendLevel; // Fixed point U4.12 so 0x1000 means 1.0
public:
volatile int32_t flags;
// Cache line boundary (32 bytes)
audio_track_cblk_t();
uint32_t stepUser(uint32_t frameCount);
bool stepServer(uint32_t frameCount);
void* buffer(uint32_t offset) const;
uint32_t framesAvailable();
uint32_t framesAvailable_l();
uint32_t framesReady();
bool tryLock();
// No barriers on the following operations, so the ordering of loads/stores
// with respect to other parameters is UNPREDICTABLE. That's considered safe.
// for AudioTrack client only, caller must limit to 0.0 <= sendLevel <= 1.0
void setSendLevel(float sendLevel) {
mSendLevel = uint16_t(sendLevel * 0x1000);
}
// for AudioFlinger only; the return value must be validated by the caller
uint16_t getSendLevel_U4_12() const {
return mSendLevel;
}
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_AUDIO_TRACK_SHARED_H
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