503 lines
13 KiB
C++
503 lines
13 KiB
C++
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
|
|
|
|
#include "Vgm_Emu.h"
|
|
|
|
#include "blargg_endian.h"
|
|
#include <string.h>
|
|
#include <math.h>
|
|
#include <algorithm>
|
|
|
|
/* Copyright (C) 2003-2006 Shay Green. This module is free software; you
|
|
can redistribute it and/or modify it under the terms of the GNU Lesser
|
|
General Public License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version. This
|
|
module is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
|
|
details. You should have received a copy of the GNU Lesser General Public
|
|
License along with this module; if not, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
|
|
|
|
#include "blargg_source.h"
|
|
|
|
double const fm_gain = 3.0; // FM emulators are internally quieter to avoid 16-bit overflow
|
|
double const rolloff = 0.990;
|
|
double const oversample_factor = 1.0;
|
|
|
|
using std::min;
|
|
using std::max;
|
|
|
|
Vgm_Emu::Vgm_Emu()
|
|
{
|
|
disable_oversampling_ = false;
|
|
psg_rate = 0;
|
|
set_type( gme_vgm_type );
|
|
|
|
static int const types [8] = {
|
|
wave_type | 1, wave_type | 0, wave_type | 2, noise_type | 0
|
|
};
|
|
set_voice_types( types );
|
|
|
|
set_silence_lookahead( 1 ); // tracks should already be trimmed
|
|
|
|
set_equalizer( make_equalizer( -14.0, 80 ) );
|
|
}
|
|
|
|
Vgm_Emu::~Vgm_Emu() { }
|
|
|
|
// Track info
|
|
|
|
static byte const* skip_gd3_str( byte const* in, byte const* end )
|
|
{
|
|
while ( end - in >= 2 )
|
|
{
|
|
in += 2;
|
|
if ( !(in [-2] | in [-1]) )
|
|
break;
|
|
}
|
|
return in;
|
|
}
|
|
|
|
static byte const* get_gd3_str( byte const* in, byte const* end, char* field )
|
|
{
|
|
byte const* mid = skip_gd3_str( in, end );
|
|
int len = (mid - in) / 2 - 1;
|
|
if ( len > 0 )
|
|
{
|
|
len = min( len, (int) Gme_File::max_field_ );
|
|
field [len] = 0;
|
|
for ( int i = 0; i < len; i++ )
|
|
field [i] = (in [i * 2 + 1] ? '?' : in [i * 2]); // TODO: convert to utf-8
|
|
}
|
|
return mid;
|
|
}
|
|
|
|
static byte const* get_gd3_pair( byte const* in, byte const* end, char* field )
|
|
{
|
|
return skip_gd3_str( get_gd3_str( in, end, field ), end );
|
|
}
|
|
|
|
static void parse_gd3( byte const* in, byte const* end, track_info_t* out )
|
|
{
|
|
in = get_gd3_pair( in, end, out->song );
|
|
in = get_gd3_pair( in, end, out->game );
|
|
in = get_gd3_pair( in, end, out->system );
|
|
in = get_gd3_pair( in, end, out->author );
|
|
in = get_gd3_str ( in, end, out->copyright );
|
|
in = get_gd3_pair( in, end, out->dumper );
|
|
in = get_gd3_str ( in, end, out->comment );
|
|
}
|
|
|
|
int const gd3_header_size = 12;
|
|
|
|
static long check_gd3_header( byte const* h, long remain )
|
|
{
|
|
if ( remain < gd3_header_size ) return 0;
|
|
if ( memcmp( h, "Gd3 ", 4 ) ) return 0;
|
|
if ( get_le32( h + 4 ) >= 0x200 ) return 0;
|
|
|
|
long gd3_size = get_le32( h + 8 );
|
|
if ( gd3_size > remain - gd3_header_size ) return 0;
|
|
|
|
return gd3_size;
|
|
}
|
|
|
|
byte const* Vgm_Emu::gd3_data( int* size ) const
|
|
{
|
|
if ( size )
|
|
*size = 0;
|
|
|
|
long gd3_offset = get_le32( header().gd3_offset ) - 0x2C;
|
|
if ( gd3_offset < 0 )
|
|
return 0;
|
|
|
|
byte const* gd3 = data + header_size + gd3_offset;
|
|
long gd3_size = check_gd3_header( gd3, data_end - gd3 );
|
|
if ( !gd3_size )
|
|
return 0;
|
|
|
|
if ( size )
|
|
*size = gd3_size + gd3_header_size;
|
|
|
|
return gd3;
|
|
}
|
|
|
|
static void get_vgm_length( Vgm_Emu::header_t const& h, track_info_t* out )
|
|
{
|
|
long length = get_le32( h.track_duration ) * 10 / 441;
|
|
if ( length > 0 )
|
|
{
|
|
long loop = get_le32( h.loop_duration );
|
|
if ( loop > 0 && get_le32( h.loop_offset ) )
|
|
{
|
|
out->loop_length = loop * 10 / 441;
|
|
out->intro_length = length - out->loop_length;
|
|
}
|
|
else
|
|
{
|
|
out->length = length; // 1000 / 44100 (VGM files used 44100 as timebase)
|
|
out->intro_length = length; // make it clear that track is no longer than length
|
|
out->loop_length = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
blargg_err_t Vgm_Emu::track_info_( track_info_t* out, int ) const
|
|
{
|
|
get_vgm_length( header(), out );
|
|
|
|
int size;
|
|
byte const* gd3 = gd3_data( &size );
|
|
if ( gd3 )
|
|
parse_gd3( gd3 + gd3_header_size, gd3 + size, out );
|
|
|
|
return 0;
|
|
}
|
|
|
|
static blargg_err_t check_vgm_header( Vgm_Emu::header_t const& h )
|
|
{
|
|
if ( memcmp( h.tag, "Vgm ", 4 ) )
|
|
return gme_wrong_file_type;
|
|
return 0;
|
|
}
|
|
|
|
struct Vgm_File : Gme_Info_
|
|
{
|
|
Vgm_Emu::header_t h;
|
|
blargg_vector<byte> gd3;
|
|
|
|
Vgm_File() { set_type( gme_vgm_type ); }
|
|
|
|
blargg_err_t load_( Data_Reader& in )
|
|
{
|
|
long file_size = in.remain();
|
|
if ( file_size <= Vgm_Emu::header_size )
|
|
return gme_wrong_file_type;
|
|
|
|
RETURN_ERR( in.read( &h, Vgm_Emu::header_size ) );
|
|
RETURN_ERR( check_vgm_header( h ) );
|
|
|
|
long gd3_offset = get_le32( h.gd3_offset ) - 0x2C;
|
|
long remain = file_size - Vgm_Emu::header_size - gd3_offset;
|
|
byte gd3_h [gd3_header_size];
|
|
if ( gd3_offset > 0 && remain >= gd3_header_size )
|
|
{
|
|
RETURN_ERR( in.skip( gd3_offset ) );
|
|
RETURN_ERR( in.read( gd3_h, sizeof gd3_h ) );
|
|
long gd3_size = check_gd3_header( gd3_h, remain );
|
|
if ( gd3_size )
|
|
{
|
|
RETURN_ERR( gd3.resize( gd3_size ) );
|
|
RETURN_ERR( in.read( gd3.begin(), gd3.size() ) );
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
blargg_err_t track_info_( track_info_t* out, int ) const
|
|
{
|
|
get_vgm_length( h, out );
|
|
if ( gd3.size() )
|
|
parse_gd3( gd3.begin(), gd3.end(), out );
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
static Music_Emu* new_vgm_emu () { return BLARGG_NEW Vgm_Emu ; }
|
|
static Music_Emu* new_vgm_file() { return BLARGG_NEW Vgm_File; }
|
|
|
|
static gme_type_t_ const gme_vgm_type_ = { "Sega SMS/Genesis", 1, &new_vgm_emu, &new_vgm_file, "VGM", 1 };
|
|
extern gme_type_t const gme_vgm_type = &gme_vgm_type_;
|
|
|
|
static gme_type_t_ const gme_vgz_type_ = { "Sega SMS/Genesis", 1, &new_vgm_emu, &new_vgm_file, "VGZ", 1 };
|
|
extern gme_type_t const gme_vgz_type = &gme_vgz_type_;
|
|
|
|
|
|
// Setup
|
|
|
|
void Vgm_Emu::set_tempo_( double t )
|
|
{
|
|
if ( psg_rate )
|
|
{
|
|
vgm_rate = (long) (44100 * t + 0.5);
|
|
blip_time_factor = (long) floor( double (1L << blip_time_bits) / vgm_rate * psg_rate + 0.5 );
|
|
//debug_printf( "blip_time_factor: %ld\n", blip_time_factor );
|
|
//debug_printf( "vgm_rate: %ld\n", vgm_rate );
|
|
// TODO: remove? calculates vgm_rate more accurately (above differs at most by one Hz only)
|
|
//blip_time_factor = (long) floor( double (1L << blip_time_bits) * psg_rate / 44100 / t + 0.5 );
|
|
//vgm_rate = (long) floor( double (1L << blip_time_bits) * psg_rate / blip_time_factor + 0.5 );
|
|
|
|
fm_time_factor = 2 + (long) floor( fm_rate * (1L << fm_time_bits) / vgm_rate + 0.5 );
|
|
}
|
|
}
|
|
|
|
blargg_err_t Vgm_Emu::set_sample_rate_( long sample_rate )
|
|
{
|
|
RETURN_ERR( blip_buf.set_sample_rate( sample_rate, 1000 / 30 ) );
|
|
return Classic_Emu::set_sample_rate_( sample_rate );
|
|
}
|
|
|
|
blargg_err_t Vgm_Emu::set_multi_channel ( bool is_enabled )
|
|
{
|
|
// we acutally should check here whether this is classic emu or not
|
|
// however set_multi_channel() is called before setup_fm() resulting in uninited is_classic_emu()
|
|
// hard code it to unsupported
|
|
#if 0
|
|
if ( is_classic_emu() )
|
|
{
|
|
RETURN_ERR( Music_Emu::set_multi_channel_( is_enabled ) );
|
|
return 0;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
(void) is_enabled;
|
|
return "multichannel rendering not supported for YM2*** FM sound chip emulators";
|
|
}
|
|
}
|
|
|
|
void Vgm_Emu::update_eq( blip_eq_t const& eq )
|
|
{
|
|
psg[0].treble_eq( eq );
|
|
if ( psg_dual )
|
|
psg[1].treble_eq( eq );
|
|
dac_synth.treble_eq( eq );
|
|
}
|
|
|
|
void Vgm_Emu::set_voice( int i, Blip_Buffer* c, Blip_Buffer* l, Blip_Buffer* r )
|
|
{
|
|
if ( psg_dual )
|
|
{
|
|
if ( psg_t6w28 )
|
|
{
|
|
// TODO: Make proper output of each PSG chip: 0 - all right, 1 - all left
|
|
if ( i < psg[0].osc_count )
|
|
psg[0].osc_output( i, c, r, r );
|
|
if ( i < psg[1].osc_count )
|
|
psg[1].osc_output( i, c, l, l );
|
|
}
|
|
else
|
|
{
|
|
if ( i < psg[0].osc_count )
|
|
psg[0].osc_output( i, c, l, r );
|
|
if ( i < psg[1].osc_count )
|
|
psg[1].osc_output( i, c, l, r );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ( i < psg[0].osc_count )
|
|
psg[0].osc_output( i, c, l, r );
|
|
}
|
|
|
|
}
|
|
|
|
void Vgm_Emu::mute_voices_( int mask )
|
|
{
|
|
Classic_Emu::mute_voices_( mask );
|
|
dac_synth.output( &blip_buf );
|
|
if ( uses_fm )
|
|
{
|
|
psg[0].output( (mask & 0x80) ? 0 : &blip_buf );
|
|
if ( psg_dual )
|
|
psg[1].output( (mask & 0x80) ? 0 : &blip_buf );
|
|
if ( ym2612[0].enabled() )
|
|
{
|
|
dac_synth.volume( (mask & 0x40) ? 0.0 : 0.1115 / 256 * fm_gain * gain() );
|
|
ym2612[0].mute_voices( mask );
|
|
if ( ym2612[1].enabled() )
|
|
ym2612[1].mute_voices( mask );
|
|
}
|
|
if ( ym2413[0].enabled() )
|
|
{
|
|
int m = mask & 0x3F;
|
|
if ( mask & 0x20 )
|
|
m |= 0x01E0; // channels 5-8
|
|
if ( mask & 0x40 )
|
|
m |= 0x3E00;
|
|
ym2413[0].mute_voices( m );
|
|
if ( ym2413[1].enabled() )
|
|
ym2413[1].mute_voices( m );
|
|
}
|
|
}
|
|
}
|
|
|
|
blargg_err_t Vgm_Emu::load_mem_( byte const* new_data, long new_size )
|
|
{
|
|
assert( offsetof (header_t,unused2 [8]) == header_size );
|
|
|
|
if ( new_size <= header_size )
|
|
return gme_wrong_file_type;
|
|
|
|
header_t const& h = *(header_t const*) new_data;
|
|
|
|
RETURN_ERR( check_vgm_header( h ) );
|
|
|
|
check( get_le32( h.version ) <= 0x150 );
|
|
|
|
// psg rate
|
|
psg_rate = get_le32( h.psg_rate );
|
|
if ( !psg_rate )
|
|
psg_rate = 3579545;
|
|
psg_dual = ( psg_rate & 0x40000000 ) != 0;
|
|
psg_t6w28 = ( psg_rate & 0x80000000 ) != 0;
|
|
psg_rate &= 0x0FFFFFFF;
|
|
blip_buf.clock_rate( psg_rate );
|
|
|
|
data = new_data;
|
|
data_end = new_data + new_size;
|
|
|
|
// get loop
|
|
loop_begin = data_end;
|
|
if ( get_le32( h.loop_offset ) )
|
|
loop_begin = &data [get_le32( h.loop_offset ) + offsetof (header_t,loop_offset)];
|
|
|
|
set_voice_count( psg[0].osc_count );
|
|
|
|
RETURN_ERR( setup_fm() );
|
|
|
|
static const char* const fm_names [] = {
|
|
"FM 1", "FM 2", "FM 3", "FM 4", "FM 5", "FM 6", "PCM", "PSG"
|
|
};
|
|
static const char* const psg_names [] = { "Square 1", "Square 2", "Square 3", "Noise" };
|
|
set_voice_names( uses_fm ? fm_names : psg_names );
|
|
|
|
// do after FM in case output buffer is changed
|
|
return Classic_Emu::setup_buffer( psg_rate );
|
|
}
|
|
|
|
blargg_err_t Vgm_Emu::setup_fm()
|
|
{
|
|
long ym2612_rate = get_le32( header().ym2612_rate );
|
|
bool ym2612_dual = ( ym2612_rate & 0x40000000 ) != 0;
|
|
long ym2413_rate = get_le32( header().ym2413_rate );
|
|
bool ym2413_dual = ( ym2413_rate & 0x40000000 ) != 0;
|
|
if ( ym2413_rate && get_le32( header().version ) < 0x110 )
|
|
update_fm_rates( &ym2413_rate, &ym2612_rate );
|
|
|
|
uses_fm = false;
|
|
|
|
fm_rate = blip_buf.sample_rate() * oversample_factor;
|
|
|
|
if ( ym2612_rate )
|
|
{
|
|
ym2612_rate &= ~0xC0000000;
|
|
uses_fm = true;
|
|
if ( disable_oversampling_ )
|
|
fm_rate = ym2612_rate / 144.0;
|
|
Dual_Resampler::setup( fm_rate / blip_buf.sample_rate(), rolloff, fm_gain * gain() );
|
|
RETURN_ERR( ym2612[0].set_rate( fm_rate, ym2612_rate ) );
|
|
ym2612[0].enable( true );
|
|
if ( ym2612_dual )
|
|
{
|
|
RETURN_ERR( ym2612[1].set_rate( fm_rate, ym2612_rate ) );
|
|
ym2612[1].enable( true );
|
|
}
|
|
set_voice_count( 8 );
|
|
}
|
|
|
|
if ( !uses_fm && ym2413_rate )
|
|
{
|
|
ym2413_rate &= ~0xC0000000;
|
|
uses_fm = true;
|
|
if ( disable_oversampling_ )
|
|
fm_rate = ym2413_rate / 72.0;
|
|
Dual_Resampler::setup( fm_rate / blip_buf.sample_rate(), rolloff, fm_gain * gain() );
|
|
int result = ym2413[0].set_rate( fm_rate, ym2413_rate );
|
|
if ( result == 2 )
|
|
return "YM2413 FM sound isn't supported";
|
|
CHECK_ALLOC( !result );
|
|
ym2413[0].enable( true );
|
|
if ( ym2413_dual )
|
|
{
|
|
ym2413[1].enable( true );
|
|
int result = ym2413[1].set_rate( fm_rate, ym2413_rate );
|
|
if ( result == 2 )
|
|
return "YM2413 FM sound isn't supported";
|
|
CHECK_ALLOC( !result );
|
|
}
|
|
set_voice_count( 8 );
|
|
}
|
|
|
|
if ( uses_fm )
|
|
{
|
|
RETURN_ERR( Dual_Resampler::reset( blip_buf.length() * blip_buf.sample_rate() / 1000 ) );
|
|
psg[0].volume( 0.135 * fm_gain * gain() );
|
|
if ( psg_dual )
|
|
psg[1].volume( 0.135 * fm_gain * gain() );
|
|
}
|
|
else
|
|
{
|
|
ym2612[0].enable( false );
|
|
ym2612[1].enable( false );
|
|
ym2413[0].enable( false );
|
|
ym2413[1].enable( false );
|
|
psg[0].volume( gain() );
|
|
psg[1].volume( gain() );
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Emulation
|
|
|
|
blargg_err_t Vgm_Emu::start_track_( int track )
|
|
{
|
|
RETURN_ERR( Classic_Emu::start_track_( track ) );
|
|
psg[0].reset( get_le16( header().noise_feedback ), header().noise_width );
|
|
if ( psg_dual )
|
|
psg[1].reset( get_le16( header().noise_feedback ), header().noise_width );
|
|
|
|
dac_disabled = -1;
|
|
pos = data + header_size;
|
|
pcm_data = pos;
|
|
pcm_pos = pos;
|
|
dac_amp = -1;
|
|
vgm_time = 0;
|
|
if ( get_le32( header().version ) >= 0x150 )
|
|
{
|
|
long data_offset = get_le32( header().data_offset );
|
|
check( data_offset );
|
|
if ( data_offset )
|
|
pos += data_offset + offsetof (header_t,data_offset) - 0x40;
|
|
}
|
|
|
|
if ( uses_fm )
|
|
{
|
|
if ( ym2413[0].enabled() )
|
|
ym2413[0].reset();
|
|
|
|
if ( ym2413[1].enabled() )
|
|
ym2413[1].reset();
|
|
|
|
if ( ym2612[0].enabled() )
|
|
ym2612[0].reset();
|
|
|
|
if ( ym2612[1].enabled() )
|
|
ym2612[1].reset();
|
|
|
|
fm_time_offset = 0;
|
|
blip_buf.clear();
|
|
Dual_Resampler::clear();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
blargg_err_t Vgm_Emu::run_clocks( blip_time_t& time_io, int msec )
|
|
{
|
|
time_io = run_commands( msec * vgm_rate / 1000 );
|
|
psg[0].end_frame( time_io );
|
|
if ( psg_dual )
|
|
psg[1].end_frame( time_io );
|
|
return 0;
|
|
}
|
|
|
|
blargg_err_t Vgm_Emu::play_( long count, sample_t* out )
|
|
{
|
|
if ( !uses_fm )
|
|
return Classic_Emu::play_( count, out );
|
|
|
|
Dual_Resampler::dual_play( count, out, blip_buf );
|
|
return 0;
|
|
}
|