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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 {
// ----------------------------------------------------------------------------
#define THREAD_PRIORITY_AUDIO_CLIENT (ANDROID_PRIORITY_AUDIO)
// 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
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;
Condition cv;
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
uint32_t frameSize;
uint8_t channels;
uint8_t flowControlFlag; // underrun (out) or overrrun (in) indication
uint8_t out; // out equals 1 for AudioTrack and 0 for AudioRecord
uint8_t forceReady;
uint16_t bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger
uint16_t waitTimeMs; // Cumulated wait time
// 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();
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_AUDIO_TRACK_SHARED_H
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