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/*
** Copyright 2011, 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_ECHO_REFERENCE_H
#define ANDROID_ECHO_REFERENCE_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/threads.h>
#include <hardware_legacy/AudioSystemLegacy.h>
#include "ReSampler.h"
namespace android_audio_legacy {
using android::Mutex;
using android::AutoMutex;
class EchoReference : public ReSampler::BufferProvider {
public:
EchoReference(audio_format_t rdFormat,
uint32_t rdChannelCount,
uint32_t rdSamplingRate,
audio_format_t wrFormat,
uint32_t wrChannelCount,
uint32_t wrSamplingRate);
virtual ~EchoReference();
// echo reference state: it field indicating if read, write or both are active.
enum state {
ECHOREF_IDLE = 0x00, // idle
ECHOREF_READING = 0x01, // reading is active
ECHOREF_WRITING = 0x02 // writing is active
};
// Buffer descriptor used by read() and write() methods, including the render time stamp.
// for write(), The time stamp is the render time for the last sample in the buffer written
// for read(), the time stamp is the render time for the first sample in the buffer read
class Buffer {
public:
void *raw;
size_t frameCount;
struct timespec tstamp; // render time stamp of buffer. 0.0 means if unknown
};
// BufferProvider
status_t getNextBuffer(ReSampler::BufferProvider::Buffer* buffer);
void releaseBuffer(ReSampler::BufferProvider::Buffer* buffer);
status_t initCheck() { return mStatus; }
status_t read(Buffer *buffer);
status_t write(Buffer *buffer);
private:
void reset_l();
void computeRenderTime(struct timespec *renderTime);
status_t mStatus; // init status
uint32_t mState; // active state: reading, writing or both
audio_format_t mRdFormat; // read sample format
uint32_t mRdChannelCount; // read number of channels
uint32_t mRdSamplingRate; // read sampling rate
size_t mRdFrameSize; // read frame size (bytes per sample)
audio_format_t mWrFormat; // write sample format
uint32_t mWrChannelCount; // write number of channels
uint32_t mWrSamplingRate; // write sampling rate
size_t mWrFrameSize; // write frame size (bytes per sample)
void *mBuffer; // main buffer
size_t mBufSize; // main buffer size in frames
size_t mFramesIn; // number of frames in main buffer
void *mWrBuf; // buffer for input conversions
size_t mWrBufSize; // size of conversion buffer in frames
size_t mWrFramesIn; // number of frames in conversion buffer
void *mWrSrcBuf; // resampler input buf (either mWrBuf or buffer used by write()
struct timespec mWrRenderTime; // latest render time indicated by write()
uint32_t mRdDurationUs; // Duration of last buffer read (used for mCond wait timeout)
android::Mutex mLock; // Mutex protecting read/write concurrency
android::Condition mCond; // Condition signaled when data is ready to read
ReSampler *mDownSampler; // input resampler
};
}; // namespace android
#endif // ANDROID_ECHO_REFERENCE_H
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