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#pragma once
/*
* Copyright (C) 2010-2012 Team XBMC
* http://xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "../AEAudioFormat.h"
#include "utils/StdString.h"
#include "PlatformDefs.h"
#include <math.h>
#if defined(HAS_PULSEAUDIO)
#include <pulse/pulseaudio.h>
#endif
#ifdef TARGET_WINDOWS
#if _M_IX86_FP>0 && !defined(__SSE__)
#define __SSE__
#endif
#endif
#ifdef __SSE__
#include <xmmintrin.h>
#else
#define __m128 void
#endif
#ifdef __GNUC__
#define MEMALIGN(b, x) x __attribute__((aligned(b)))
#else
#define MEMALIGN(b, x) __declspec(align(b)) x
#endif
class CAEUtil
{
private:
static unsigned int m_seed;
#ifdef __SSE__
static __m128i m_sseSeed;
#endif
static float SoftClamp(const float x);
public:
static CAEChannelInfo GuessChLayout (const unsigned int channels);
static const char* GetStdChLayoutName(const enum AEStdChLayout layout);
static const unsigned int DataFormatToBits (const enum AEDataFormat dataFormat);
static const char* DataFormatToStr (const enum AEDataFormat dataFormat);
/*! \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 const float PercentToGain(const float value)
{
static const float db_range = 60.0f;
return (value - 1)*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 const float GainToScale(const float dB)
{
return pow(10.0f, dB/20);
}
#if defined(HAS_PULSEAUDIO)
/*
Hardware volume [0,1] will be converted to dB using PercentToGain() and then converted to scale by
GainToScale() before reaching PulseAudio. However the underlying math assumes 60dB volume range which
contradicts (-inf,0] volume range used by pulseaudio 2.0 and above. To fix this we will reverse the
process of GainToScale() and PercentToGain() to get hardware volume then using our own linear converter to
get valid pulseaudio volume [0,PA_VOLUME_NORM].
*/
static inline const int PercentToPulseVolume(const float value)
{
float hardware_volume = 0.f;
// This is to reverse "pow(10.0f, dB/20)" in GainToScale() and "(value - 1)*db_range" in PercentToGain()
if ( value > 0.f )
hardware_volume = (double)( (20 * log10(value)) / 60 + 1 );
// This is to simulate pa_sw_volume_from_linear() which convert a linear hardware volume rage [0,1]
// to pulseaudio volume rage [0, PA_VOLUME_NORM]
return (int)( hardware_volume * PA_VOLUME_NORM );
}
#endif
#ifdef __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);
/*
Rand implementations based on:
http://software.intel.com/en-us/articles/fast-random-number-generator-on-the-intel-pentiumr-4-processor/
This is NOT safe for crypto work, but perfectly fine for audio usage (dithering)
*/
static float FloatRand1(const float min, const float max);
static void FloatRand4(const float min, const float max, float result[4], __m128 *sseresult = NULL);
static bool S16NeedsByteSwap(AEDataFormat in, AEDataFormat out);
};
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