80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
// $package. http://www.slack.net/~ant/
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#include "Resampler.h"
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/* Copyright (C) 2004-2008 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "blargg_source.h"
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Resampler::Resampler()
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{
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write_pos = 0;
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rate_ = 0;
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}
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Resampler::~Resampler() { }
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void Resampler::clear()
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{
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write_pos = 0;
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clear_();
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}
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inline int Resampler::resample_wrapper( sample_t out [], int* out_size,
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sample_t const in [], int in_size )
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{
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assert( rate() );
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sample_t* out_ = out;
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int result = resample_( &out_, out + *out_size, in, in_size ) - in;
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assert( out_ <= out + *out_size );
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assert( result <= in_size );
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*out_size = out_ - out;
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return result;
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}
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int Resampler::resample( sample_t out [], int out_size, sample_t const in [], int* in_size )
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{
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*in_size = resample_wrapper( out, &out_size, in, *in_size );
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return out_size;
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}
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//// Buffering
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blargg_err_t Resampler::resize_buffer( int new_size )
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{
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RETURN_ERR( buf.resize( new_size ) );
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clear();
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return blargg_ok;
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}
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int Resampler::skip_input( int count )
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{
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write_pos -= count;
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if ( write_pos < 0 ) // occurs when downsampling
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{
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count += write_pos;
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write_pos = 0;
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}
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memmove( buf.begin(), &buf [count], write_pos * sizeof buf [0] );
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return count;
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}
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int Resampler::read( sample_t out [], int out_size )
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{
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if ( out_size )
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skip_input( resample_wrapper( out, &out_size, buf.begin(), write_pos ) );
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return out_size;
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}
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