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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.
380 lines
8.6 KiB
C++
380 lines
8.6 KiB
C++
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#include "Gym_Emu.h"
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#include "blargg_endian.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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double const min_tempo = 0.25;
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double const oversample_factor = 5 / 3.0;
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double const fm_gain = 3.0;
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const long base_clock = 53700300;
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const long clock_rate = base_clock / 15;
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Gym_Emu::Gym_Emu()
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{
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data = 0;
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pos = 0;
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set_type( gme_gym_type );
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static const char* const names [] = {
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"FM 1", "FM 2", "FM 3", "FM 4", "FM 5", "FM 6", "PCM", "PSG"
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};
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set_voice_names( names );
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set_silence_lookahead( 1 ); // tracks should already be trimmed
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}
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Gym_Emu::~Gym_Emu() { }
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// Track info
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static void get_gym_info( Gym_Emu::header_t const& h, long length, track_info_t* out )
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{
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if ( !memcmp( h.tag, "GYMX", 4 ) )
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{
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length = length * 50 / 3; // 1000 / 60
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long loop = get_le32( h.loop_start );
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if ( loop )
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{
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out->intro_length = loop * 50 / 3;
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out->loop_length = length - out->intro_length;
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}
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else
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{
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out->length = length;
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out->intro_length = length; // make it clear that track is no longer than length
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out->loop_length = 0;
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}
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// more stupidity where the field should have been left
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if ( strcmp( h.song, "Unknown Song" ) )
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GME_COPY_FIELD( h, out, song );
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if ( strcmp( h.game, "Unknown Game" ) )
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GME_COPY_FIELD( h, out, game );
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if ( strcmp( h.copyright, "Unknown Publisher" ) )
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GME_COPY_FIELD( h, out, copyright );
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if ( strcmp( h.dumper, "Unknown Person" ) )
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GME_COPY_FIELD( h, out, dumper );
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if ( strcmp( h.comment, "Header added by YMAMP" ) )
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GME_COPY_FIELD( h, out, comment );
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}
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}
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blargg_err_t Gym_Emu::track_info_( track_info_t* out, int ) const
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{
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get_gym_info( header_, track_length(), out );
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return 0;
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}
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static long gym_track_length( byte const* p, byte const* end )
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{
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long time = 0;
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while ( p < end )
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{
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switch ( *p++ )
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{
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case 0:
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time++;
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break;
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case 1:
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case 2:
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p += 2;
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break;
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case 3:
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p += 1;
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break;
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}
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}
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return time;
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}
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long Gym_Emu::track_length() const { return gym_track_length( data, data_end ); }
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static blargg_err_t check_header( byte const* in, long size, int* data_offset = 0 )
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{
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if ( size < 4 )
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return gme_wrong_file_type;
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if ( memcmp( in, "GYMX", 4 ) == 0 )
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{
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if ( size < Gym_Emu::header_size + 1 )
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return gme_wrong_file_type;
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if ( memcmp( ((Gym_Emu::header_t const*) in)->packed, "\0\0\0\0", 4 ) != 0 )
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return "Packed GYM file not supported";
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if ( data_offset )
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*data_offset = Gym_Emu::header_size;
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}
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else if ( *in > 3 )
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{
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return gme_wrong_file_type;
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}
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return 0;
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}
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struct Gym_File : Gme_Info_
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{
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byte const* file_begin;
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byte const* file_end;
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int data_offset;
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Gym_File() { set_type( gme_gym_type ); }
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blargg_err_t load_mem_( byte const* in, long size )
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{
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file_begin = in;
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file_end = in + size;
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data_offset = 0;
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return check_header( in, size, &data_offset );
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}
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blargg_err_t track_info_( track_info_t* out, int ) const
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{
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long length = gym_track_length( &file_begin [data_offset], file_end );
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get_gym_info( *(Gym_Emu::header_t const*) file_begin, length, out );
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return 0;
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}
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};
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static Music_Emu* new_gym_emu () { return BLARGG_NEW Gym_Emu ; }
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static Music_Emu* new_gym_file() { return BLARGG_NEW Gym_File; }
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static gme_type_t_ const gme_gym_type_ = { "Sega Genesis", 1, &new_gym_emu, &new_gym_file, "GYM", 0 };
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BLARGG_EXPORT extern gme_type_t const gme_gym_type = &gme_gym_type_;
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// Setup
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blargg_err_t Gym_Emu::set_sample_rate_( long sample_rate )
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{
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blip_eq_t eq( -32, 8000, sample_rate );
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apu.treble_eq( eq );
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dac_synth.treble_eq( eq );
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apu.volume( 0.135 * fm_gain * gain() );
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dac_synth.volume( 0.125 / 256 * fm_gain * gain() );
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double factor = Dual_Resampler::setup( oversample_factor, 0.990, fm_gain * gain() );
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fm_sample_rate = sample_rate * factor;
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RETURN_ERR( blip_buf.set_sample_rate( sample_rate, int (1000 / 60.0 / min_tempo) ) );
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blip_buf.clock_rate( clock_rate );
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RETURN_ERR( fm.set_rate( fm_sample_rate, base_clock / 7.0 ) );
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RETURN_ERR( Dual_Resampler::reset( long (1.0 / 60 / min_tempo * sample_rate) ) );
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return 0;
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}
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void Gym_Emu::set_tempo_( double t )
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{
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if ( t < min_tempo )
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{
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set_tempo( min_tempo );
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return;
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}
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if ( blip_buf.sample_rate() )
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{
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clocks_per_frame = long (clock_rate / 60 / tempo());
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Dual_Resampler::resize( long (sample_rate() / (60.0 * tempo())) );
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}
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}
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void Gym_Emu::mute_voices_( int mask )
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{
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Music_Emu::mute_voices_( mask );
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fm.mute_voices( mask );
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dac_muted = (mask & 0x40) != 0;
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apu.output( (mask & 0x80) ? 0 : &blip_buf );
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}
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blargg_err_t Gym_Emu::load_mem_( byte const* in, long size )
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{
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assert( offsetof (header_t,packed [4]) == header_size );
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int offset = 0;
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RETURN_ERR( check_header( in, size, &offset ) );
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set_voice_count( 8 );
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data = in + offset;
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data_end = in + size;
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loop_begin = 0;
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if ( offset )
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header_ = *(header_t const*) in;
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else
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memset( &header_, 0, sizeof header_ );
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return 0;
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}
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// Emulation
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blargg_err_t Gym_Emu::start_track_( int track )
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{
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RETURN_ERR( Music_Emu::start_track_( track ) );
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pos = data;
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loop_remain = get_le32( header_.loop_start );
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prev_dac_count = 0;
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dac_enabled = false;
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dac_amp = -1;
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fm.reset();
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apu.reset();
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blip_buf.clear();
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Dual_Resampler::clear();
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return 0;
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}
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void Gym_Emu::run_dac( int dac_count )
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{
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// Guess beginning and end of sample and adjust rate and buffer position accordingly.
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// count dac samples in next frame
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int next_dac_count = 0;
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const byte* p = this->pos;
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int cmd;
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while ( (cmd = *p++) != 0 )
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{
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int data = *p++;
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if ( cmd <= 2 )
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++p;
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if ( cmd == 1 && data == 0x2A )
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next_dac_count++;
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}
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// detect beginning and end of sample
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int rate_count = dac_count;
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int start = 0;
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if ( !prev_dac_count && next_dac_count && dac_count < next_dac_count )
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{
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rate_count = next_dac_count;
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start = next_dac_count - dac_count;
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}
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else if ( prev_dac_count && !next_dac_count && dac_count < prev_dac_count )
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{
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rate_count = prev_dac_count;
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}
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// Evenly space samples within buffer section being used
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blip_resampled_time_t period = blip_buf.resampled_duration( clocks_per_frame ) / rate_count;
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blip_resampled_time_t time = blip_buf.resampled_time( 0 ) +
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period * start + (period >> 1);
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int dac_amp = this->dac_amp;
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if ( dac_amp < 0 )
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dac_amp = dac_buf [0];
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for ( int i = 0; i < dac_count; i++ )
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{
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int delta = dac_buf [i] - dac_amp;
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dac_amp += delta;
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dac_synth.offset_resampled( time, delta, &blip_buf );
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time += period;
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}
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this->dac_amp = dac_amp;
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}
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void Gym_Emu::parse_frame()
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{
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int dac_count = 0;
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const byte* pos = this->pos;
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if ( loop_remain && !--loop_remain )
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loop_begin = pos; // find loop on first time through sequence
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int cmd;
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while ( (cmd = *pos++) != 0 )
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{
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int data = *pos++;
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if ( cmd == 1 )
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{
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int data2 = *pos++;
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if ( data != 0x2A )
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{
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if ( data == 0x2B )
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dac_enabled = (data2 & 0x80) != 0;
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fm.write0( data, data2 );
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}
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else if ( dac_count < (int) sizeof dac_buf )
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{
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dac_buf [dac_count] = data2;
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dac_count += dac_enabled;
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}
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}
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else if ( cmd == 2 )
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{
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fm.write1( data, *pos++ );
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}
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else if ( cmd == 3 )
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{
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apu.write_data( 0, data );
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}
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else
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{
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// to do: many GYM streams are full of errors, and error count should
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// reflect cases where music is really having problems
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//log_error();
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--pos; // put data back
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}
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}
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// loop
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if ( pos >= data_end )
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{
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check( pos == data_end );
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if ( loop_begin )
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pos = loop_begin;
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else
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set_track_ended();
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}
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this->pos = pos;
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// dac
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if ( dac_count && !dac_muted )
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run_dac( dac_count );
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prev_dac_count = dac_count;
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}
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int Gym_Emu::play_frame( blip_time_t blip_time, int sample_count, sample_t* buf )
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{
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if ( !track_ended() )
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parse_frame();
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apu.end_frame( blip_time );
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memset( buf, 0, sample_count * sizeof *buf );
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fm.run( sample_count >> 1, buf );
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return sample_count;
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}
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blargg_err_t Gym_Emu::play_( long count, sample_t* out )
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{
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Dual_Resampler::dual_play( count, out, blip_buf );
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return 0;
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}
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