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// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
#include "Dual_Resampler.h"
/* Copyright (C) 2003-2008 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"
// TODO: fix this. hack since resampler holds back some output.
int const resampler_extra = 34;
int const stereo = 2;
Dual_Resampler::Dual_Resampler() { }
Dual_Resampler::~Dual_Resampler() { }
blargg_err_t Dual_Resampler::reset( int pairs )
{
// expand allocations a bit
RETURN_ERR( sample_buf.resize( (pairs + (pairs >> 2)) * 2 ) );
resize( pairs );
resampler_size = oversamples_per_frame + (oversamples_per_frame >> 2);
RETURN_ERR( resampler.resize_buffer( resampler_size ) );
resampler.clear();
return blargg_ok;
}
void Dual_Resampler::resize( int pairs )
{
int new_sample_buf_size = pairs * 2;
//new_sample_buf_size = new_sample_buf_size / 4 * 4; // TODO: needed only for 3:2 downsampler
if ( sample_buf_size != new_sample_buf_size )
{
if ( (unsigned) new_sample_buf_size > sample_buf.size() )
{
check( false );
return;
}
sample_buf_size = new_sample_buf_size;
oversamples_per_frame = int (pairs * resampler.rate()) * 2 + 2;
clear();
}
}
void Dual_Resampler::clear()
{
buf_pos = sample_buf_size;
resampler.clear();
}
void Dual_Resampler::play_frame_( Stereo_Buffer& stereo_buf, dsample_t out [] )
{
int pair_count = sample_buf_size >> 1;
blip_time_t blip_time = stereo_buf.center()->count_clocks( pair_count );
int sample_count = oversamples_per_frame - resampler.written() + resampler_extra;
int new_count = set_callback.f( set_callback.data, blip_time, sample_count, resampler.buffer() );
assert( new_count < resampler_size );
stereo_buf.end_frame( blip_time );
assert( stereo_buf.samples_avail() == pair_count * 2 );
resampler.write( new_count );
int count = resampler.read( sample_buf.begin(), sample_buf_size );
assert( count == sample_buf_size );
mix_samples( stereo_buf, out );
stereo_buf.left()->remove_samples( pair_count );
stereo_buf.right()->remove_samples( pair_count );
stereo_buf.center()->remove_samples( pair_count );
}
void Dual_Resampler::dual_play( int count, dsample_t out [], Stereo_Buffer& stereo_buf )
{
// empty extra buffer
int remain = sample_buf_size - buf_pos;
if ( remain )
{
if ( remain > count )
remain = count;
count -= remain;
memcpy( out, &sample_buf [buf_pos], remain * sizeof *out );
out += remain;
buf_pos += remain;
}
// entire frames
while ( count >= sample_buf_size )
{
play_frame_( stereo_buf, out );
out += sample_buf_size;
count -= sample_buf_size;
}
// extra
if ( count )
{
play_frame_( stereo_buf, sample_buf.begin() );
buf_pos = count;
memcpy( out, sample_buf.begin(), count * sizeof *out );
out += count;
}
}
void Dual_Resampler::mix_samples( Stereo_Buffer& stereo_buf, dsample_t out_ [] )
{
// lol hax
if ( ((Tracked_Blip_Buffer*)stereo_buf.left())->non_silent() | ((Tracked_Blip_Buffer*)stereo_buf.right())->non_silent() )
mix_stereo( stereo_buf, out_ );
else
mix_mono( stereo_buf, out_ );
}
void Dual_Resampler::mix_mono( Stereo_Buffer& stereo_buf, dsample_t out_ [] )
{
int const bass = BLIP_READER_BASS( *stereo_buf.center() );
BLIP_READER_BEGIN( sn, *stereo_buf.center() );
int count = sample_buf_size >> 1;
BLIP_READER_ADJ_( sn, count );
typedef dsample_t stereo_dsample_t [2];
stereo_dsample_t* BLARGG_RESTRICT out = (stereo_dsample_t*) out_ + count;
stereo_dsample_t const* BLARGG_RESTRICT in =
(stereo_dsample_t const*) sample_buf.begin() + count;
int offset = -count;
int const gain = gain_;
do
{
int s = BLIP_READER_READ_RAW( sn ) >> (blip_sample_bits - 16);
BLIP_READER_NEXT_IDX_( sn, bass, offset );
int l = (in [offset] [0] * gain >> gain_bits) + s;
int r = (in [offset] [1] * gain >> gain_bits) + s;
BLIP_CLAMP( l, l );
out [offset] [0] = (blip_sample_t) l;
BLIP_CLAMP( r, r );
out [offset] [1] = (blip_sample_t) r;
}
while ( ++offset );
BLIP_READER_END( sn, *stereo_buf.center() );
}
void Dual_Resampler::mix_stereo( Stereo_Buffer& stereo_buf, dsample_t out_ [] )
{
int const bass = BLIP_READER_BASS( *stereo_buf.center() );
BLIP_READER_BEGIN( snc, *stereo_buf.center() );
BLIP_READER_BEGIN( snl, *stereo_buf.left() );
BLIP_READER_BEGIN( snr, *stereo_buf.right() );
int count = sample_buf_size >> 1;
BLIP_READER_ADJ_( snc, count );
BLIP_READER_ADJ_( snl, count );
BLIP_READER_ADJ_( snr, count );
typedef dsample_t stereo_dsample_t [2];
stereo_dsample_t* BLARGG_RESTRICT out = (stereo_dsample_t*) out_ + count;
stereo_dsample_t const* BLARGG_RESTRICT in =
(stereo_dsample_t const*) sample_buf.begin() + count;
int offset = -count;
int const gain = gain_;
do
{
int sc = BLIP_READER_READ_RAW( snc ) >> (blip_sample_bits - 16);
int sl = BLIP_READER_READ_RAW( snl ) >> (blip_sample_bits - 16);
int sr = BLIP_READER_READ_RAW( snr ) >> (blip_sample_bits - 16);
BLIP_READER_NEXT_IDX_( snc, bass, offset );
BLIP_READER_NEXT_IDX_( snl, bass, offset );
BLIP_READER_NEXT_IDX_( snr, bass, offset );
int l = (in [offset] [0] * gain >> gain_bits) + sl + sc;
int r = (in [offset] [1] * gain >> gain_bits) + sr + sc;
BLIP_CLAMP( l, l );
out [offset] [0] = (blip_sample_t) l;
BLIP_CLAMP( r, r );
out [offset] [1] = (blip_sample_t) r;
}
while ( ++offset );
BLIP_READER_END( snc, *stereo_buf.center() );
BLIP_READER_END( snl, *stereo_buf.left() );
BLIP_READER_END( snr, *stereo_buf.right() );
}
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