aboutsummaryrefslogblamecommitdiffstats
path: root/src/pcm/PcmMix.cxx
blob: caf7fe516b6a0096d852dfbb8f827c6ce12f5a9d (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
  
                                                          










                                                                       



                                                                          

   
                   
                     
                     
                       
                          
                     
                         
 
                   

                 



                                                                            
 
                                                
 
                                                                      

                                                        
 
                                      

 
                                                      
           


                                                   
 
                                       
                                                                             

 
                                                      
           
                                                                               
 
                                                           
                                        
 



                                                                       

 













                                                                     
           

                                                            
                                
 
                         

                                     


                                     
                              

                                                                          
                            
 
                               

                                                                           
                            
 
                                   

                                                                               
                            
 
                               

                                                                           
                            
 
                                 

                                                                           


                                                             
         
 
                      
                          

 


                                                                      
 
                                               
 
                                          

 
                                                      
           


                                             
 
                                       
                                                     

 
                                                      
           
                                               
 
                                                           
                                        
 


                                                                 

 










                                                                         
           
                                                        
                            
 
                         

                                     


                                     
                              
                                                                     
                            
 
                               
                                                                      
                            
 
                                   
                                                                          
                            
 
                               
                                                                      
                            
 
                                 

                                                                       
                            
         
 
                      
                          

 
    
                                                        
                                            
 

                
                                                                           
                                                 
                         
                                                               

                                   

               

                                                  
 
                                                                                       
 
/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.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 of the License, 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "PcmMix.hxx"
#include "Volume.hxx"
#include "PcmUtils.hxx"
#include "AudioFormat.hxx"
#include "Traits.hxx"
#include "util/Clamp.hxx"

#include <assert.h>
#include <math.h>

template<SampleFormat F, class Traits=SampleTraits<F>>
static typename Traits::value_type
PcmAddVolume(typename Traits::value_type _a, typename Traits::value_type _b,
	     int volume1, int volume2)
{
	typename Traits::long_type a(_a), b(_b);

	typename Traits::value_type c = ((a * volume1 + b * volume2) +
		pcm_volume_dither() + PCM_VOLUME_1S / 2)
		/ PCM_VOLUME_1S;

	return PcmClamp<F, Traits>(c);
}

template<SampleFormat F, class Traits=SampleTraits<F>>
static void
PcmAddVolume(typename Traits::pointer_type a,
	     typename Traits::const_pointer_type b,
	     size_t n, int volume1, int volume2)
{
	for (size_t i = 0; i != n; ++i)
		a[i] = PcmAddVolume<F, Traits>(a[i], b[i], volume1, volume2);
}

template<SampleFormat F, class Traits=SampleTraits<F>>
static void
PcmAddVolumeVoid(void *a, const void *b, size_t size, int volume1, int volume2)
{
	constexpr size_t sample_size = Traits::SAMPLE_SIZE;
	assert(size % sample_size == 0);

	PcmAddVolume<F, Traits>(typename Traits::pointer_type(a),
				typename Traits::const_pointer_type(b),
				size / sample_size,
				volume1, volume2);
}

static void
pcm_add_vol_float(float *buffer1, const float *buffer2,
		  unsigned num_samples, float volume1, float volume2)
{
	while (num_samples > 0) {
		float sample1 = *buffer1;
		float sample2 = *buffer2++;

		sample1 = (sample1 * volume1 + sample2 * volume2);
		*buffer1++ = sample1;
		--num_samples;
	}
}

static bool
pcm_add_vol(void *buffer1, const void *buffer2, size_t size,
	    int vol1, int vol2,
	    SampleFormat format)
{
	switch (format) {
	case SampleFormat::UNDEFINED:
	case SampleFormat::DSD:
		/* not implemented */
		return false;

	case SampleFormat::S8:
		PcmAddVolumeVoid<SampleFormat::S8>(buffer1, buffer2, size,
						   vol1, vol2);
		return true;

	case SampleFormat::S16:
		PcmAddVolumeVoid<SampleFormat::S16>(buffer1, buffer2, size,
						    vol1, vol2);
		return true;

	case SampleFormat::S24_P32:
		PcmAddVolumeVoid<SampleFormat::S24_P32>(buffer1, buffer2, size,
							vol1, vol2);
		return true;

	case SampleFormat::S32:
		PcmAddVolumeVoid<SampleFormat::S32>(buffer1, buffer2, size,
						    vol1, vol2);
		return true;

	case SampleFormat::FLOAT:
		pcm_add_vol_float((float *)buffer1, (const float *)buffer2,
				  size / 4,
				  pcm_volume_to_float(vol1),
				  pcm_volume_to_float(vol2));
		return true;
	}

	assert(false);
	gcc_unreachable();
}

template<SampleFormat F, class Traits=SampleTraits<F>>
static typename Traits::value_type
PcmAdd(typename Traits::value_type _a, typename Traits::value_type _b)
{
	typename Traits::sum_type a(_a), b(_b);

	return PcmClamp<F, Traits>(a + b);
}

template<SampleFormat F, class Traits=SampleTraits<F>>
static void
PcmAdd(typename Traits::pointer_type a,
       typename Traits::const_pointer_type b,
       size_t n)
{
	for (size_t i = 0; i != n; ++i)
		a[i] = PcmAdd<F, Traits>(a[i], b[i]);
}

template<SampleFormat F, class Traits=SampleTraits<F>>
static void
PcmAddVoid(void *a, const void *b, size_t size)
{
	constexpr size_t sample_size = Traits::SAMPLE_SIZE;
	assert(size % sample_size == 0);

	PcmAdd<F, Traits>(typename Traits::pointer_type(a),
			  typename Traits::const_pointer_type(b),
			  size / sample_size);
}

static void
pcm_add_float(float *buffer1, const float *buffer2, unsigned num_samples)
{
	while (num_samples > 0) {
		float sample1 = *buffer1;
		float sample2 = *buffer2++;
		*buffer1++ = sample1 + sample2;
		--num_samples;
	}
}

static bool
pcm_add(void *buffer1, const void *buffer2, size_t size,
	SampleFormat format)
{
	switch (format) {
	case SampleFormat::UNDEFINED:
	case SampleFormat::DSD:
		/* not implemented */
		return false;

	case SampleFormat::S8:
		PcmAddVoid<SampleFormat::S8>(buffer1, buffer2, size);
		return true;

	case SampleFormat::S16:
		PcmAddVoid<SampleFormat::S16>(buffer1, buffer2, size);
		return true;

	case SampleFormat::S24_P32:
		PcmAddVoid<SampleFormat::S24_P32>(buffer1, buffer2, size);
		return true;

	case SampleFormat::S32:
		PcmAddVoid<SampleFormat::S32>(buffer1, buffer2, size);
		return true;

	case SampleFormat::FLOAT:
		pcm_add_float((float *)buffer1, (const float *)buffer2,
			      size / 4);
		return true;
	}

	assert(false);
	gcc_unreachable();
}

bool
pcm_mix(void *buffer1, const void *buffer2, size_t size,
	SampleFormat format, float portion1)
{
	float s;

	/* portion1 is between 0.0 and 1.0 for crossfading, MixRamp uses -1
	 * to signal mixing rather than fading */
	if (portion1 < 0)
		return pcm_add(buffer1, buffer2, size, format);

	s = sin(M_PI_2 * portion1);
	s *= s;

	int vol1 = s * PCM_VOLUME_1S + 0.5;
	vol1 = Clamp<int>(vol1, 0, PCM_VOLUME_1S);

	return pcm_add_vol(buffer1, buffer2, size, vol1, PCM_VOLUME_1S - vol1, format);
}