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410 lines
10 KiB
C++
410 lines
10 KiB
C++
// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/
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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 stereo = 2; // number of channels for stereo
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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 = { -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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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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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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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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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 * stereo * 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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// 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) * stereo;
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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() * stereo;
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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( long msec )
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{
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blargg_long time = msec_to_samples( msec );
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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::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 / stereo);
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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 - long(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 % stereo == 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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//dprintf( "%*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 * stereo * 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 ( 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_::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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