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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
451 lines
11 KiB
C++
451 lines
11 KiB
C++
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#include "Music_Emu.h"
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#include "Multi_Buffer.h"
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#include <string.h>
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/* Copyright (C) 2003-2006 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 silence_max = 6; // seconds
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int const silence_threshold = 0x10;
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long const fade_block_size = 512;
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int const fade_shift = 8; // fade ends with gain at 1.0 / (1 << fade_shift)
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Music_Emu::equalizer_t const Music_Emu::tv_eq =
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Music_Emu::make_equalizer( -8.0, 180 );
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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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out_time = 0;
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emu_time = 0;
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emu_track_ended_ = true;
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track_ended_ = true;
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fade_start = INT_MAX / 2 + 1;
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fade_step = 1;
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silence_time = 0;
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silence_count = 0;
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buf_remain = 0;
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warning(); // clear warning
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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::Music_Emu()
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{
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effects_buffer = 0;
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multi_channel_ = false;
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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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// defaults
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max_initial_silence = 2;
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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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emu_autoload_playback_limit_ = true;
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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(); // non-virtual
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}
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Music_Emu::~Music_Emu() { delete effects_buffer; }
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blargg_err_t Music_Emu::set_sample_rate( long 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( buf.resize( buf_size ) );
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sample_rate_ = rate;
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return 0;
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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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equalizer_ = eq;
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set_equalizer_( eq );
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}
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bool Music_Emu::multi_channel() const
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{
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return this->multi_channel_;
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}
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blargg_err_t Music_Emu::set_multi_channel( bool )
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{
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// by default not supported, derived may override this
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return "unsupported for this emulator type";
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}
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blargg_err_t Music_Emu::set_multi_channel_( bool isEnabled )
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{
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// multi channel support must be set at the very beginning
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require( !sample_rate() );
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multi_channel_ = isEnabled;
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return 0;
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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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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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void 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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}
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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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RETURN_ERR( start_track_( remapped ) );
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emu_track_ended_ = false;
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track_ended_ = false;
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if ( !ignore_silence_ )
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{
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// play until non-silence or end of track
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for ( long end = max_initial_silence * out_channels() * sample_rate(); emu_time < end; )
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{
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fill_buf();
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if ( buf_remain | (int) emu_track_ended_ )
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break;
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}
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emu_time = buf_remain;
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out_time = 0;
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silence_time = 0;
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silence_count = 0;
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}
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return track_ended() ? warning() : 0;
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}
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void Music_Emu::end_track_if_error( blargg_err_t err )
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{
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if ( err )
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{
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emu_track_ended_ = true;
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set_warning( err );
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}
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}
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bool Music_Emu::autoload_playback_limit() const
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{
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return emu_autoload_playback_limit_;
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}
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void Music_Emu::set_autoload_playback_limit( bool do_autoload_limit )
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{
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emu_autoload_playback_limit_ = do_autoload_limit;
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}
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// Tell/Seek
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blargg_long Music_Emu::msec_to_samples( blargg_long msec ) const
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{
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blargg_long sec = msec / 1000;
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msec -= sec * 1000;
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return (sec * sample_rate() + msec * sample_rate() / 1000) * out_channels();
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}
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long Music_Emu::tell_samples() const
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{
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return out_time;
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}
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long Music_Emu::tell() const
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{
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blargg_long rate = sample_rate() * out_channels();
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blargg_long sec = out_time / rate;
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return sec * 1000 + (out_time - sec * rate) * 1000 / rate;
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}
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blargg_err_t Music_Emu::seek_samples( long time )
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{
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if ( time < out_time )
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RETURN_ERR( start_track( current_track_ ) );
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return skip( time - out_time );
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}
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blargg_err_t Music_Emu::seek( long msec )
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{
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return seek_samples( msec_to_samples( msec ) );
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}
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blargg_err_t Music_Emu::skip( long count )
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{
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require( current_track() >= 0 ); // start_track() must have been called already
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out_time += count;
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// remove from silence and buf first
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{
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long n = min( count, silence_count );
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silence_count -= n;
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count -= n;
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n = min( count, buf_remain );
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buf_remain -= n;
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count -= n;
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}
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if ( count && !emu_track_ended_ )
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{
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emu_time += count;
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end_track_if_error( skip_( count ) );
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}
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if ( !(silence_count | buf_remain) ) // caught up to emulator, so update track ended
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track_ended_ |= emu_track_ended_;
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return 0;
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}
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blargg_err_t Music_Emu::skip_( long count )
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{
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// for long skip, mute sound
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const long threshold = 30000;
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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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while ( count > threshold / 2 && !emu_track_ended_ )
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{
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RETURN_ERR( play_( buf_size, buf.begin() ) );
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count -= buf_size;
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}
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mute_voices( saved_mute );
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}
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while ( count && !emu_track_ended_ )
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{
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long n = buf_size;
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if ( n > count )
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n = count;
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count -= n;
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RETURN_ERR( play_( n, buf.begin() ) );
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}
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return 0;
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}
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// Fading
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void Music_Emu::set_fade( long start_msec, long length_msec )
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{
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fade_step = sample_rate() * length_msec / (fade_block_size * fade_shift * 1000 / out_channels());
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fade_start = msec_to_samples( start_msec );
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}
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// unit / pow( 2.0, (double) x / step )
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static int int_log( blargg_long x, int step, int unit )
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{
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int shift = x / step;
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int fraction = (x - shift * step) * unit / step;
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return ((unit - fraction) + (fraction >> 1)) >> shift;
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}
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void Music_Emu::handle_fade( long out_count, sample_t* out )
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{
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for ( int i = 0; i < out_count; i += fade_block_size )
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{
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int const shift = 14;
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int const unit = 1 << shift;
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int gain = int_log( (out_time + i - fade_start) / fade_block_size,
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fade_step, unit );
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if ( gain < (unit >> fade_shift) )
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track_ended_ = emu_track_ended_ = true;
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sample_t* io = &out [i];
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for ( int count = min( fade_block_size, out_count - i ); count; --count )
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{
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*io = sample_t ((*io * gain) >> shift);
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++io;
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}
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}
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}
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// Silence detection
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void Music_Emu::emu_play( long count, sample_t* out )
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{
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check( current_track_ >= 0 );
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emu_time += count;
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if ( current_track_ >= 0 && !emu_track_ended_ )
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end_track_if_error( play_( count, out ) );
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else
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memset( out, 0, count * sizeof *out );
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}
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// number of consecutive silent samples at end
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static long count_silence( Music_Emu::sample_t* begin, long size )
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{
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Music_Emu::sample_t first = *begin;
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*begin = silence_threshold; // sentinel
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Music_Emu::sample_t* p = begin + size;
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while ( (unsigned) (*--p + silence_threshold / 2) <= (unsigned) silence_threshold ) { }
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*begin = first;
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return size - (p - begin);
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}
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// fill internal buffer and check it for silence
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void Music_Emu::fill_buf()
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{
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assert( !buf_remain );
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if ( !emu_track_ended_ )
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{
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emu_play( buf_size, buf.begin() );
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long silence = count_silence( buf.begin(), buf_size );
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if ( silence < buf_size )
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{
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silence_time = emu_time - silence;
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buf_remain = buf_size;
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return;
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}
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}
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silence_count += buf_size;
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}
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blargg_err_t Music_Emu::play( long out_count, sample_t* out )
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{
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if ( track_ended_ )
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{
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memset( out, 0, out_count * sizeof *out );
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}
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else
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{
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require( current_track() >= 0 );
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require( out_count % out_channels() == 0 );
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assert( emu_time >= out_time );
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// prints nifty graph of how far ahead we are when searching for silence
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//debug_printf( "%*s \n", int ((emu_time - out_time) * 7 / sample_rate()), "*" );
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long pos = 0;
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if ( silence_count )
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{
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// during a run of silence, run emulator at >=2x speed so it gets ahead
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long ahead_time = silence_lookahead * (out_time + out_count - silence_time) + silence_time;
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while ( emu_time < ahead_time && !(buf_remain | emu_track_ended_) )
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fill_buf();
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// fill with silence
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pos = min( silence_count, out_count );
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memset( out, 0, pos * sizeof *out );
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silence_count -= pos;
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if ( emu_time - silence_time > silence_max * out_channels() * sample_rate() )
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{
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track_ended_ = emu_track_ended_ = true;
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silence_count = 0;
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buf_remain = 0;
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}
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}
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if ( buf_remain )
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{
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// empty silence buf
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long n = min( buf_remain, out_count - pos );
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memcpy( &out [pos], buf.begin() + (buf_size - buf_remain), n * sizeof *out );
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buf_remain -= n;
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pos += n;
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}
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// generate remaining samples normally
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long remain = out_count - pos;
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if ( remain )
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{
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emu_play( remain, out + pos );
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track_ended_ |= emu_track_ended_;
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if ( !ignore_silence_ || out_time > fade_start )
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{
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// check end for a new run of silence
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long silence = count_silence( out + pos, remain );
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if ( silence < remain )
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silence_time = emu_time - silence;
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if ( emu_time - silence_time >= buf_size )
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fill_buf(); // cause silence detection on next play()
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}
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}
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if ( fade_start >= 0 && out_time > fade_start )
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handle_fade( out_count, out );
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}
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out_time += out_count;
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return 0;
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}
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// Gme_Info_
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blargg_err_t Gme_Info_::set_sample_rate_( long ) { return 0; }
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void Gme_Info_::pre_load() { Gme_File::pre_load(); } // skip Music_Emu
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void Gme_Info_::post_load_() { 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_::enable_accuracy_( bool ) { 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 "Use full emulator for playback"; }
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blargg_err_t Gme_Info_::play_( long, sample_t* ) { return "Use full emulator for playback"; }
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