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Classic_Emu.cpp
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Classic_Emu.cpp
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// Game_Music_Emu 0.5.5. http://www.slack.net/~ant/
#include "Classic_Emu.h"
#include "Multi_Buffer.h"
#include <string.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"
Classic_Emu::Classic_Emu()
{
buf = 0;
stereo_buffer = 0;
voice_types = 0;
// avoid inconsistency in our duplicated constants
assert( (int) wave_type == (int) Multi_Buffer::wave_type );
assert( (int) noise_type == (int) Multi_Buffer::noise_type );
assert( (int) mixed_type == (int) Multi_Buffer::mixed_type );
}
Classic_Emu::~Classic_Emu()
{
delete stereo_buffer;
}
void Classic_Emu::set_equalizer_( equalizer_t const& eq )
{
Music_Emu::set_equalizer_( eq );
update_eq( eq.treble );
if ( buf )
buf->bass_freq( (int) equalizer().bass );
}
blargg_err_t Classic_Emu::set_sample_rate_( long rate )
{
if ( !buf )
{
if ( !stereo_buffer )
CHECK_ALLOC( stereo_buffer = BLARGG_NEW Stereo_Buffer );
buf = stereo_buffer;
}
return buf->set_sample_rate( rate, 1000 / 20 );
}
void Classic_Emu::mute_voices_( int mask )
{
Music_Emu::mute_voices_( mask );
for ( int i = voice_count(); i--; )
{
if ( mask & (1 << i) )
{
set_voice( i, 0, 0, 0 );
}
else
{
Multi_Buffer::channel_t ch = buf->channel( i, (voice_types ? voice_types [i] : 0) );
assert( (ch.center && ch.left && ch.right) ||
(!ch.center && !ch.left && !ch.right) ); // all or nothing
set_voice( i, ch.center, ch.left, ch.right );
}
}
}
void Classic_Emu::change_clock_rate( long rate )
{
clock_rate_ = rate;
buf->clock_rate( rate );
}
blargg_err_t Classic_Emu::setup_buffer( long rate )
{
change_clock_rate( rate );
RETURN_ERR( buf->set_channel_count( voice_count() ) );
set_equalizer( equalizer() );
buf_changed_count = buf->channels_changed_count();
return 0;
}
blargg_err_t Classic_Emu::start_track_( int track )
{
RETURN_ERR( Music_Emu::start_track_( track ) );
buf->clear();
return 0;
}
blargg_err_t Classic_Emu::play_( long count, sample_t* out )
{
long remain = count;
while ( remain )
{
remain -= buf->read_samples( &out [count - remain], remain );
if ( remain )
{
if ( buf_changed_count != buf->channels_changed_count() )
{
buf_changed_count = buf->channels_changed_count();
remute_voices();
}
int msec = buf->length();
blip_time_t clocks_emulated = (blargg_long) msec * clock_rate_ / 1000;
RETURN_ERR( run_clocks( clocks_emulated, msec ) );
assert( clocks_emulated );
buf->end_frame( clocks_emulated );
}
}
return 0;
}
// Rom_Data
blargg_err_t Rom_Data_::load_rom_data_( Data_Reader& in,
int header_size, void* header_out, int fill, long pad_size )
{
long file_offset = pad_size - header_size;
rom_addr = 0;
mask = 0;
size_ = 0;
rom.clear();
file_size_ = in.remain();
if ( file_size_ <= header_size ) // <= because there must be data after header
return gme_wrong_file_type;
blargg_err_t err = rom.resize( file_offset + file_size_ + pad_size );
if ( !err )
err = in.read( rom.begin() + file_offset, file_size_ );
if ( err )
{
rom.clear();
return err;
}
file_size_ -= header_size;
memcpy( header_out, &rom [file_offset], header_size );
memset( rom.begin() , fill, pad_size );
memset( rom.end() - pad_size, fill, pad_size );
return 0;
}
void Rom_Data_::set_addr_( long addr, int unit )
{
rom_addr = addr - unit - pad_extra;
long rounded = (addr + file_size_ + unit - 1) / unit * unit;
if ( rounded <= 0 )
{
rounded = 0;
}
else
{
int shift = 0;
unsigned long max_addr = (unsigned long) (rounded - 1);
while ( max_addr >> shift )
shift++;
mask = (1L << shift) - 1;
}
if ( addr < 0 )
addr = 0;
size_ = rounded;
if ( rom.resize( rounded - rom_addr + pad_extra ) ) { } // OK if shrink fails
if ( 0 )
{
debug_printf( "addr: %X\n", addr );
debug_printf( "file_size: %d\n", file_size_ );
debug_printf( "rounded: %d\n", rounded );
debug_printf( "mask: $%X\n", mask );
}
}

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