125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "Classic_Emu.h"
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#include "Multi_Buffer.h"
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/* Copyright (C) 2003-2008 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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Classic_Emu::Classic_Emu()
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{
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buf = NULL;
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stereo_buffer = NULL;
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voice_types = NULL;
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// avoid inconsistency in our duplicated constants
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assert( (int) wave_type == (int) Multi_Buffer::wave_type );
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assert( (int) noise_type == (int) Multi_Buffer::noise_type );
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assert( (int) mixed_type == (int) Multi_Buffer::mixed_type );
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}
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Classic_Emu::~Classic_Emu()
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{
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delete stereo_buffer;
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delete effects_buffer_;
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effects_buffer_ = NULL;
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}
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void Classic_Emu::set_equalizer_( equalizer_t const& eq )
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{
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Music_Emu::set_equalizer_( eq );
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update_eq( eq.treble );
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if ( buf )
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buf->bass_freq( (int) equalizer().bass );
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}
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blargg_err_t Classic_Emu::set_sample_rate_( int rate )
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{
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if ( !buf )
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{
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if ( !stereo_buffer )
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CHECK_ALLOC( stereo_buffer = BLARGG_NEW Stereo_Buffer );
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buf = stereo_buffer;
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}
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return buf->set_sample_rate( rate, 1000 / 20 );
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}
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void Classic_Emu::mute_voices_( int mask )
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{
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Music_Emu::mute_voices_( mask );
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for ( int i = voice_count(); i--; )
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{
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if ( mask & (1 << i) )
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{
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set_voice( i, NULL, NULL, NULL );
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}
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else
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{
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Multi_Buffer::channel_t ch = buf->channel( i );
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assert( (ch.center && ch.left && ch.right) ||
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(!ch.center && !ch.left && !ch.right) ); // all or nothing
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set_voice( i, ch.center, ch.left, ch.right );
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}
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}
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}
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void Classic_Emu::change_clock_rate( int rate )
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{
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clock_rate_ = rate;
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buf->clock_rate( rate );
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}
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blargg_err_t Classic_Emu::setup_buffer( int rate )
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{
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change_clock_rate( rate );
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RETURN_ERR( buf->set_channel_count( voice_count(), voice_types ) );
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set_equalizer( equalizer() );
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buf_changed_count = buf->channels_changed_count();
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return blargg_ok;
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}
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blargg_err_t Classic_Emu::start_track_( int track )
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{
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RETURN_ERR( Music_Emu::start_track_( track ) );
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buf->clear();
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return blargg_ok;
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}
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blargg_err_t Classic_Emu::play_( int count, sample_t out [] )
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{
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// read from buffer, then refill buffer and repeat if necessary
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int remain = count;
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while ( remain )
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{
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buf->disable_immediate_removal();
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remain -= buf->read_samples( &out [count - remain], remain );
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if ( remain )
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{
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if ( buf_changed_count != buf->channels_changed_count() )
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{
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buf_changed_count = buf->channels_changed_count();
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remute_voices();
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}
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// TODO: use more accurate length calculation
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int msec = buf->length();
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blip_time_t clocks_emulated = msec * clock_rate_ / 1000 - 100;
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RETURN_ERR( run_clocks( clocks_emulated, msec ) );
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assert( clocks_emulated );
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buf->end_frame( clocks_emulated );
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}
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}
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return blargg_ok;
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}
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