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/*
* Copyright (C) 2010-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#pragma once
#include "AEAudioFormat.h"
#include "PlatformDefs.h"
#include <math.h>
extern "C" {
#include <libavcodec/version.h>
#include <libavutil/channel_layout.h>
#include <libavutil/samplefmt.h>
#include <libavutil/version.h>
}
// AV sync options
enum AVSync
{
SYNC_DISCON = 0,
SYNC_RESAMPLE
};
struct AEDelayStatus
{
void SetDelay(double d);
double GetDelay() const;
double delay = 0.0; // delay in sink currently
double maxcorrection = 0.0; // time correction must not be greater than sink delay
int64_t tick = 0; // timestamp when delay was calculated
};
/**
* @brief lockless consistency guaranteeer
*
* Requires write to be a higher priority thread
*
* use in writer:
* m_locker.enter();
* update_stuff();
* m_locker.leave();
*
* use in reader:
* CAESpinLock lock(m_locker);
* do {
* get_stuff();
* } while(lock.retry());
*/
class CAESpinSection
{
public:
void enter() { m_enter++; }
void leave() { m_leave = m_enter; }
protected:
friend class CAESpinLock;
volatile unsigned int m_enter = 0;
volatile unsigned int m_leave = 0;
};
class CAESpinLock
{
public:
explicit CAESpinLock(CAESpinSection& section)
: m_section(section)
, m_begin(section.m_enter)
{}
bool retry()
{
if(m_section.m_enter != m_begin
|| m_section.m_enter != m_section.m_leave)
{
m_begin = m_section.m_enter;
return true;
}
else
return false;
}
private:
CAESpinSection& m_section;
unsigned int m_begin;
};
class CAEUtil
{
private:
static float SoftClamp(const float x);
public:
static CAEChannelInfo GuessChLayout (const unsigned int channels);
static const char* GetStdChLayoutName(const enum AEStdChLayout layout);
static unsigned int DataFormatToBits (const enum AEDataFormat dataFormat);
static unsigned int DataFormatToUsedBits (const enum AEDataFormat dataFormat);
static unsigned int DataFormatToDitherBits(const enum AEDataFormat dataFormat);
static const char* DataFormatToStr (const enum AEDataFormat dataFormat);
static const char* StreamTypeToStr(const enum CAEStreamInfo::DataType dataType);
/*! \brief convert a volume percentage (as a proportion) to a dB gain
We assume a dB range of 60dB, i.e. assume that 0% volume corresponds
to a reduction of 60dB.
\param value the volume from 0..1
\return the corresponding gain in dB from -60dB .. 0dB.
\sa GainToScale
*/
static inline float PercentToGain(const float value)
{
static const float db_range = 60.0f;
return (value - 1)*db_range;
}
/*! \brief convert a dB gain to volume percentage (as a proportion)
We assume a dB range of 60dB, i.e. assume that 0% volume corresponds
to a reduction of 60dB.
\param the corresponding gain in dB from -60dB .. 0dB.
\return value the volume from 0..1
\sa ScaleToGain
*/
static inline float GainToPercent(const float gain)
{
static const float db_range = 60.0f;
return 1+(gain/db_range);
}
/*! \brief convert a dB gain to a scale factor for audio manipulation
Inverts gain = 20 log_10(scale)
\param dB the gain in decibels.
\return the scale factor (equivalent to a voltage multiplier).
\sa PercentToGain
*/
static inline float GainToScale(const float dB)
{
float val = 0.0f;
// we need to make sure that our lowest db returns plain zero
if (dB > -60.0f)
val = pow(10.0f, dB/20);
// in order to not introduce computing overhead for nearly zero
// values of dB e.g. -0.01 or -0.001 we clamp to top
if (val >= 0.99f)
val = 1.0f;
return val;
}
/*! \brief convert a scale factor to dB gain for audio manipulation
Inverts GainToScale result
\param the scale factor (equivalent to a voltage multiplier).
\return dB the gain in decibels.
\sa GainToScale
*/
static inline float ScaleToGain(const float scale)
{
return 20*log10(scale);
}
#if defined(HAVE_SSE) && defined(__SSE__)
static void SSEMulArray (float *data, const float mul, uint32_t count);
static void SSEMulAddArray (float *data, float *add, const float mul, uint32_t count);
#endif
static void ClampArray(float *data, uint32_t count);
static bool S16NeedsByteSwap(AEDataFormat in, AEDataFormat out);
static uint64_t GetAVChannelLayout(const CAEChannelInfo &info);
static CAEChannelInfo GetAEChannelLayout(uint64_t layout);
static AVSampleFormat GetAVSampleFormat(AEDataFormat format);
static uint64_t GetAVChannelMask(enum AEChannel aechannel);
#if LIBAVCODEC_BUILD >= AV_VERSION_INT(59, 37, 100) && \
LIBAVUTIL_BUILD >= AV_VERSION_INT(57, 28, 100)
static enum AVChannel GetAVChannel(enum AEChannel aechannel);
#endif
static int GetAVChannelIndex(enum AEChannel aechannel, uint64_t layout);
};
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