diff options
Diffstat (limited to 'plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu.cpp')
| -rw-r--r-- | plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu.cpp | 412 |
1 files changed, 0 insertions, 412 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu.cpp b/plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu.cpp deleted file mode 100644 index 0fef6bd9..00000000 --- a/plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu.cpp +++ /dev/null @@ -1,412 +0,0 @@ -// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ - -#include "Vgm_Emu.h" - -#include "blargg_endian.h" -#include <string.h> -#include <math.h> - -/* 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 = 1.5; - -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 - - static equalizer_t const eq = { -14.0, 80 }; - set_equalizer( eq ); -} - -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; } - -gme_type_t_ const gme_vgm_type [1] = { "Sega SMS/Genesis", 1, &new_vgm_emu, &new_vgm_file, "VGM", 1 }; -gme_type_t_ const gme_vgz_type [1] = { "Sega SMS/Genesis", 1, &new_vgm_emu, &new_vgm_file, "VGZ", 1 }; - -// 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 ); - //dprintf( "blip_time_factor: %ld\n", blip_time_factor ); - //dprintf( "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 ); -} - -void Vgm_Emu::update_eq( blip_eq_t const& eq ) -{ - psg.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 ( i < psg.osc_count ) - psg.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.output( (mask & 0x80) ? 0 : &blip_buf ); - if ( ym2612.enabled() ) - { - dac_synth.volume( (mask & 0x40) ? 0.0 : 0.1115 / 256 * fm_gain * gain() ); - ym2612.mute_voices( mask ); - } - - if ( ym2413.enabled() ) - { - int m = mask & 0x3F; - if ( mask & 0x20 ) - m |= 0x01E0; // channels 5-8 - if ( mask & 0x40 ) - m |= 0x3E00; - ym2413.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; - 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.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 ); - long ym2413_rate = get_le32( header().ym2413_rate ); - 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 ) - { - 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.set_rate( fm_rate, ym2612_rate ) ); - ym2612.enable( true ); - set_voice_count( 8 ); - } - - if ( !uses_fm && ym2413_rate ) - { - 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.set_rate( fm_rate, ym2413_rate ); - if ( result == 2 ) - return "YM2413 FM sound isn't supported"; - CHECK_ALLOC( !result ); - ym2413.enable( true ); - set_voice_count( 8 ); - } - - if ( uses_fm ) - { - RETURN_ERR( Dual_Resampler::reset( blip_buf.length() * blip_buf.sample_rate() / 1000 ) ); - psg.volume( 0.135 * fm_gain * gain() ); - } - else - { - ym2612.enable( false ); - ym2413.enable( false ); - psg.volume( gain() ); - } - - return 0; -} - -// Emulation - -blargg_err_t Vgm_Emu::start_track_( int track ) -{ - RETURN_ERR( Classic_Emu::start_track_( track ) ); - psg.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.enabled() ) - ym2413.reset(); - - if ( ym2612.enabled() ) - ym2612.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.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; -} |