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// Blip_Buffer 0.4.1. http://www.slack.net/~ant/
#include "multi_buffer.h"
/* Copyright (C) 2003-2006 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module 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 Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
#ifdef BLARGG_ENABLE_OPTIMIZER
#include BLARGG_ENABLE_OPTIMIZER
#endif
// Stereo_Buffer
void Buffer_init( struct Stereo_Buffer* this )
{
Blip_init( &this->bufs [0] );
Blip_init( &this->bufs [1] );
Blip_init( &this->bufs [2] );
this->chan.center = &this->bufs [0];
this->chan.left = &this->bufs [1];
this->chan.right = &this->bufs [2];
this->length_ = 0;
this->sample_rate_ = 0;
this->channels_changed_count_ = 1;
this->samples_per_frame_ = 2;
}
blargg_err_t Buffer_set_sample_rate( struct Stereo_Buffer* this, long rate, int msec )
{
int i;
for ( i = 0; i < buf_count; i++ )
RETURN_ERR( Blip_set_sample_rate( &this->bufs[i], rate, msec ) );
this->sample_rate_ = Blip_sample_rate( &this->bufs [0] );
this->length_ = Blip_length( &this->bufs [0] );
return 0;
}
void Buffer_clock_rate( struct Stereo_Buffer* this, long rate )
{
int i;
for ( i = 0; i < buf_count; i++ )
Blip_set_clock_rate( &this->bufs [i], rate );
}
void Buffer_bass_freq( struct Stereo_Buffer* this, int bass )
{
unsigned i;
for ( i = 0; i < buf_count; i++ )
Blip_bass_freq( &this->bufs [i], bass );
}
struct channel_t Buffer_channel( struct Stereo_Buffer* this )
{
return this->chan;
}
void Buffer_clear( struct Stereo_Buffer* this )
{
this->stereo_added = 0;
this->was_stereo = false;
int i;
for ( i = 0; i < buf_count; i++ )
Blip_clear( &this->bufs [i], 1 );
}
void Buffer_end_frame( struct Stereo_Buffer* this, blip_time_t clock_count )
{
this->stereo_added = 0;
unsigned i;
for ( i = 0; i < buf_count; i++ )
{
this->stereo_added |= Blip_clear_modified( &this->bufs [i] ) << i;
Blip_end_frame( &this->bufs [i], clock_count );
}
}
long Buffer_read_samples( struct Stereo_Buffer* this, blip_sample_t* out, long count )
{
require( !(count & 1) ); // count must be even
count = (unsigned) count / 2;
long avail = Blip_samples_avail( &this->bufs [0] );
if ( count > avail )
count = avail;
if ( count )
{
int bufs_used = this->stereo_added | this->was_stereo;
//dprintf( "%X\n", bufs_used );
if ( bufs_used <= 1 )
{
Buffer_mix_mono( this, out, count );
Blip_remove_samples( &this->bufs [0], count );
Blip_remove_silence( &this->bufs [1], count );
Blip_remove_silence( &this->bufs [2], count );
}
else if ( bufs_used & 1 )
{
Buffer_mix_stereo( this, out, count );
Blip_remove_samples( &this->bufs [0], count );
Blip_remove_samples( &this->bufs [1], count );
Blip_remove_samples( &this->bufs [2], count );
}
else
{
Buffer_mix_stereo_no_center( this, out, count );
Blip_remove_silence( &this->bufs [0], count );
Blip_remove_samples( &this->bufs [1], count );
Blip_remove_samples( &this->bufs [2], count );
}
// to do: this might miss opportunities for optimization
if ( !Blip_samples_avail( &this->bufs [0] ) )
{
this->was_stereo = this->stereo_added;
this->stereo_added = 0;
}
}
return count * 2;
}
unsigned Buffer_channels_changed_count( struct Stereo_Buffer* this )
{
return this->channels_changed_count_;
}
void Buffer_channels_changed( struct Stereo_Buffer* this )
{
this->channels_changed_count_++;
}
void Buffer_mix_stereo( struct Stereo_Buffer* this, blip_sample_t* out_, blargg_long count )
{
blip_sample_t* BLIP_RESTRICT out = out_;
int const bass = BLIP_READER_BASS( this->bufs [1] );
BLIP_READER_BEGIN( left, this->bufs [1] );
BLIP_READER_BEGIN( right, this->bufs [2] );
BLIP_READER_BEGIN( center, this->bufs [0] );
for ( ; count; --count )
{
int c = BLIP_READER_READ( center );
blargg_long l = c + BLIP_READER_READ( left );
blargg_long r = c + BLIP_READER_READ( right );
if ( (int16_t) l != l )
l = 0x7FFF - (l >> 24);
BLIP_READER_NEXT( center, bass );
if ( (int16_t) r != r )
r = 0x7FFF - (r >> 24);
BLIP_READER_NEXT( left, bass );
BLIP_READER_NEXT( right, bass );
out [0] = l;
out [1] = r;
out += 2;
}
BLIP_READER_END( center, this->bufs [0] );
BLIP_READER_END( right, this->bufs [2] );
BLIP_READER_END( left, this->bufs [1] );
}
void Buffer_mix_stereo_no_center( struct Stereo_Buffer* this, blip_sample_t* out_, blargg_long count )
{
blip_sample_t* BLIP_RESTRICT out = out_;
int const bass = BLIP_READER_BASS( this->bufs [1] );
BLIP_READER_BEGIN( left, this->bufs [1] );
BLIP_READER_BEGIN( right, this->bufs [2] );
for ( ; count; --count )
{
blargg_long l = BLIP_READER_READ( left );
if ( (int16_t) l != l )
l = 0x7FFF - (l >> 24);
blargg_long r = BLIP_READER_READ( right );
if ( (int16_t) r != r )
r = 0x7FFF - (r >> 24);
BLIP_READER_NEXT( left, bass );
BLIP_READER_NEXT( right, bass );
out [0] = l;
out [1] = r;
out += 2;
}
BLIP_READER_END( right, this->bufs [2] );
BLIP_READER_END( left, this->bufs [1] );
}
void Buffer_mix_mono( struct Stereo_Buffer* this, blip_sample_t* out_, blargg_long count )
{
blip_sample_t* BLIP_RESTRICT out = out_;
int const bass = BLIP_READER_BASS( this->bufs [0] );
BLIP_READER_BEGIN( center, this->bufs [0] );
for ( ; count; --count )
{
blargg_long s = BLIP_READER_READ( center );
if ( (int16_t) s != s )
s = 0x7FFF - (s >> 24);
BLIP_READER_NEXT( center, bass );
out [0] = s;
out [1] = s;
out += 2;
}
BLIP_READER_END( center, this->bufs [0] );
}
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