245 lines
6.5 KiB
C++
245 lines
6.5 KiB
C++
// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "Music_Emu.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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int const stereo = 2; // number of channels for stereo
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Music_Emu::equalizer_t const Music_Emu::tv_eq = { -8.0, 180, 0,0,0,0,0,0,0,0 };
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void Music_Emu::clear_track_vars()
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{
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current_track_ = -1;
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warning(); // clear warning
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track_filter.stop();
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}
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void Music_Emu::unload()
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{
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voice_count_ = 0;
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clear_track_vars();
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Gme_File::unload();
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}
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Music_Emu::gme_t()
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{
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effects_buffer_ = NULL;
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sample_rate_ = 0;
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mute_mask_ = 0;
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tempo_ = 1.0;
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gain_ = 1.0;
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fade_set = false;
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// defaults
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tfilter = track_filter.setup();
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set_max_initial_silence( 15 );
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set_silence_lookahead( 3 );
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ignore_silence( false );
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equalizer_.treble = -1.0;
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equalizer_.bass = 60;
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static const char* const names [] = {
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"Voice 1", "Voice 2", "Voice 3", "Voice 4",
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"Voice 5", "Voice 6", "Voice 7", "Voice 8"
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};
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set_voice_names( names );
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Music_Emu::unload(); // clears fields
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}
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Music_Emu::~gme_t()
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{
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assert( !effects_buffer_ );
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}
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blargg_err_t Music_Emu::set_sample_rate( int rate )
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{
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require( !sample_rate() ); // sample rate can't be changed once set
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RETURN_ERR( set_sample_rate_( rate ) );
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RETURN_ERR( track_filter.init( this ) );
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sample_rate_ = rate;
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tfilter.max_silence = 6 * stereo * sample_rate();
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return blargg_ok;
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}
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void Music_Emu::pre_load()
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{
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require( sample_rate() ); // set_sample_rate() must be called before loading a file
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Gme_File::pre_load();
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}
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void Music_Emu::set_equalizer( equalizer_t const& eq )
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{
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// TODO: why is GCC generating memcpy call here?
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// Without the 'if', valgrind flags it.
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if ( &eq != &equalizer_ )
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equalizer_ = eq;
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set_equalizer_( eq );
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}
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void Music_Emu::mute_voice( int index, bool mute )
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{
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require( (unsigned) index < (unsigned) voice_count() );
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int bit = 1 << index;
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int mask = mute_mask_ | bit;
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if ( !mute )
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mask ^= bit;
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mute_voices( mask );
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}
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void Music_Emu::mute_voices( int mask )
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{
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require( sample_rate() ); // sample rate must be set first
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mute_mask_ = mask;
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mute_voices_( mask );
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}
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const char* Music_Emu::voice_name( int i ) const
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{
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if ( (unsigned) i < (unsigned) voice_count_ )
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return voice_names_ [i];
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//check( false ); // TODO: enable?
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return "";
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}
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void Music_Emu::set_tempo( double t )
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{
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require( sample_rate() ); // sample rate must be set first
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double const min = 0.02;
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double const max = 4.00;
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if ( t < min ) t = min;
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if ( t > max ) t = max;
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tempo_ = t;
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set_tempo_( t );
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}
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blargg_err_t Music_Emu::post_load()
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{
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set_tempo( tempo_ );
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remute_voices();
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return Gme_File::post_load();
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}
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// Tell/Seek
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int Music_Emu::msec_to_samples( int msec ) const
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{
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int sec = msec / 1000;
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msec -= sec * 1000;
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return (sec * sample_rate() + msec * sample_rate() / 1000) * stereo;
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}
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int Music_Emu::tell() const
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{
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int rate = sample_rate() * stereo;
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int sec = track_filter.sample_count() / rate;
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return sec * 1000 + (track_filter.sample_count() - sec * rate) * 1000 / rate;
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}
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blargg_err_t Music_Emu::seek( int msec )
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{
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int time = msec_to_samples( msec );
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if ( time < track_filter.sample_count() )
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{
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RETURN_ERR( start_track( current_track_ ) );
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if ( fade_set )
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set_fade( length_msec, fade_msec );
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}
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return skip( time - track_filter.sample_count() );
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}
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blargg_err_t Music_Emu::skip( int count )
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{
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require( current_track() >= 0 ); // start_track() must have been called already
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return track_filter.skip( count );
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}
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blargg_err_t Music_Emu::skip_( int count )
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{
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// for long skip, mute sound
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const int threshold = 32768;
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if ( count > threshold )
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{
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int saved_mute = mute_mask_;
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mute_voices( ~0 );
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int n = count - threshold/2;
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n &= ~(2048-1); // round to multiple of 2048
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count -= n;
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RETURN_ERR( track_filter.skip_( n ) );
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mute_voices( saved_mute );
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}
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return track_filter.skip_( count );
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}
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// Playback
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blargg_err_t Music_Emu::start_track( int track )
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{
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clear_track_vars();
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int remapped = track;
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RETURN_ERR( remap_track_( &remapped ) );
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current_track_ = track;
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blargg_err_t err = start_track_( remapped );
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if ( err )
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{
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current_track_ = -1;
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return err;
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}
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// convert filter times to samples
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Track_Filter::setup_t s = tfilter;
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s.max_initial *= sample_rate() * stereo;
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#if GME_DISABLE_SILENCE_LOOKAHEAD
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s.lookahead = 1;
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#endif
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track_filter.setup( s );
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return track_filter.start_track();
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}
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void Music_Emu::set_fade( int start_msec, int length_msec )
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{
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fade_set = true;
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this->length_msec = start_msec;
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this->fade_msec = length_msec;
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track_filter.set_fade( start_msec < 0 ? Track_Filter::indefinite_count : msec_to_samples( start_msec ),
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length_msec * sample_rate() / (1000 / stereo) );
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}
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blargg_err_t Music_Emu::play( int out_count, sample_t out [] )
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{
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require( current_track() >= 0 );
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require( out_count % stereo == 0 );
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return track_filter.play( out_count, out );
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}
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// Gme_Info_
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blargg_err_t Gme_Info_::set_sample_rate_( int ) { return blargg_ok; }
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void Gme_Info_::pre_load() { Gme_File::pre_load(); } // skip Music_Emu
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blargg_err_t Gme_Info_::post_load() { return Gme_File::post_load(); } // skip Music_Emu
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void Gme_Info_::set_equalizer_( equalizer_t const& ){ check( false ); }
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void Gme_Info_::mute_voices_( int ) { check( false ); }
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void Gme_Info_::set_tempo_( double ) { }
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blargg_err_t Gme_Info_::start_track_( int ) { return BLARGG_ERR( BLARGG_ERR_CALLER, "can't play file opened for info only" ); }
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blargg_err_t Gme_Info_::play_( int, sample_t [] ) { return BLARGG_ERR( BLARGG_ERR_CALLER, "can't play file opened for info only" ); }
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