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Diffstat (limited to 'plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu_Impl.cpp')
-rw-r--r--plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu_Impl.cpp314
1 files changed, 0 insertions, 314 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu_Impl.cpp b/plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu_Impl.cpp
deleted file mode 100644
index a2d7c93e..00000000
--- a/plugins/gme/Game_Music_Emu-0.5.2/gme/Vgm_Emu_Impl.cpp
+++ /dev/null
@@ -1,314 +0,0 @@
-// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/
-
-#include "Vgm_Emu.h"
-
-#include <math.h>
-#include <string.h>
-#include "blargg_endian.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"
-
-enum {
- cmd_gg_stereo = 0x4F,
- cmd_psg = 0x50,
- cmd_ym2413 = 0x51,
- cmd_ym2612_port0 = 0x52,
- cmd_ym2612_port1 = 0x53,
- cmd_ym2151 = 0x54,
- cmd_delay = 0x61,
- cmd_delay_735 = 0x62,
- cmd_delay_882 = 0x63,
- cmd_byte_delay = 0x64,
- cmd_end = 0x66,
- cmd_data_block = 0x67,
- cmd_short_delay = 0x70,
- cmd_pcm_delay = 0x80,
- cmd_pcm_seek = 0xE0,
-
- pcm_block_type = 0x00,
- ym2612_dac_port = 0x2A
-};
-
-inline int command_len( int command )
-{
- switch ( command >> 4 )
- {
- case 0x03:
- case 0x04:
- return 2;
-
- case 0x05:
- case 0x0A:
- case 0x0B:
- return 3;
-
- case 0x0C:
- case 0x0D:
- return 4;
-
- case 0x0E:
- case 0x0F:
- return 5;
- }
-
- check( false );
- return 1;
-}
-
-template<class Emu>
-inline void Ym_Emu<Emu>::begin_frame( short* p )
-{
- require( enabled() );
- out = p;
- last_time = 0;
-}
-
-template<class Emu>
-inline int Ym_Emu<Emu>::run_until( int time )
-{
- int count = time - last_time;
- if ( count > 0 )
- {
- if ( last_time < 0 )
- return false;
- last_time = time;
- short* p = out;
- out += count * Emu::out_chan_count;
- Emu::run( count, p );
- }
- return true;
-}
-
-inline Vgm_Emu_Impl::fm_time_t Vgm_Emu_Impl::to_fm_time( vgm_time_t t ) const
-{
- return (t * fm_time_factor + fm_time_offset) >> fm_time_bits;
-}
-
-inline blip_time_t Vgm_Emu_Impl::to_blip_time( vgm_time_t t ) const
-{
- return (t * blip_time_factor) >> blip_time_bits;
-}
-
-void Vgm_Emu_Impl::write_pcm( vgm_time_t vgm_time, int amp )
-{
- blip_time_t blip_time = to_blip_time( vgm_time );
- int old = dac_amp;
- int delta = amp - old;
- dac_amp = amp;
- if ( old >= 0 )
- dac_synth.offset_inline( blip_time, delta, &blip_buf );
- else
- dac_amp |= dac_disabled;
-}
-
-blip_time_t Vgm_Emu_Impl::run_commands( vgm_time_t end_time )
-{
- vgm_time_t vgm_time = this->vgm_time;
- byte const* pos = this->pos;
- if ( pos >= data_end )
- {
- set_track_ended();
- if ( pos > data_end )
- set_warning( "Stream lacked end event" );
- }
-
- while ( vgm_time < end_time && pos < data_end )
- {
- // TODO: be sure there are enough bytes left in stream for particular command
- // so we don't read past end
- switch ( *pos++ )
- {
- case cmd_end:
- pos = loop_begin; // if not looped, loop_begin == data_end
- break;
-
- case cmd_delay_735:
- vgm_time += 735;
- break;
-
- case cmd_delay_882:
- vgm_time += 882;
- break;
-
- case cmd_gg_stereo:
- psg.write_ggstereo( to_blip_time( vgm_time ), *pos++ );
- break;
-
- case cmd_psg:
- psg.write_data( to_blip_time( vgm_time ), *pos++ );
- break;
-
- case cmd_delay:
- vgm_time += pos [1] * 0x100L + pos [0];
- pos += 2;
- break;
-
- case cmd_byte_delay:
- vgm_time += *pos++;
- break;
-
- case cmd_ym2413:
- if ( ym2413.run_until( to_fm_time( vgm_time ) ) )
- ym2413.write( pos [0], pos [1] );
- pos += 2;
- break;
-
- case cmd_ym2612_port0:
- if ( pos [0] == ym2612_dac_port )
- {
- write_pcm( vgm_time, pos [1] );
- }
- else if ( ym2612.run_until( to_fm_time( vgm_time ) ) )
- {
- if ( pos [0] == 0x2B )
- {
- dac_disabled = (pos [1] >> 7 & 1) - 1;
- dac_amp |= dac_disabled;
- }
- ym2612.write0( pos [0], pos [1] );
- }
- pos += 2;
- break;
-
- case cmd_ym2612_port1:
- if ( ym2612.run_until( to_fm_time( vgm_time ) ) )
- ym2612.write1( pos [0], pos [1] );
- pos += 2;
- break;
-
- case cmd_data_block: {
- check( *pos == cmd_end );
- int type = pos [1];
- long size = get_le32( pos + 2 );
- pos += 6;
- if ( type == pcm_block_type )
- pcm_data = pos;
- pos += size;
- break;
- }
-
- case cmd_pcm_seek:
- pcm_pos = pcm_data + pos [3] * 0x1000000L + pos [2] * 0x10000L +
- pos [1] * 0x100L + pos [0];
- pos += 4;
- break;
-
- default:
- int cmd = pos [-1];
- switch ( cmd & 0xF0 )
- {
- case cmd_pcm_delay:
- write_pcm( vgm_time, *pcm_pos++ );
- vgm_time += cmd & 0x0F;
- break;
-
- case cmd_short_delay:
- vgm_time += (cmd & 0x0F) + 1;
- break;
-
- case 0x50:
- pos += 2;
- break;
-
- default:
- pos += command_len( cmd ) - 1;
- set_warning( "Unknown stream event" );
- }
- }
- }
- vgm_time -= end_time;
- this->pos = pos;
- this->vgm_time = vgm_time;
-
- return to_blip_time( end_time );
-}
-
-int Vgm_Emu_Impl::play_frame( blip_time_t blip_time, int sample_count, sample_t* buf )
-{
- // to do: timing is working mostly by luck
-
- int min_pairs = sample_count >> 1;
- int vgm_time = ((long) min_pairs << fm_time_bits) / fm_time_factor - 1;
- assert( to_fm_time( vgm_time ) <= min_pairs );
- int pairs = min_pairs;
- while ( (pairs = to_fm_time( vgm_time )) < min_pairs )
- vgm_time++;
- //dprintf( "pairs: %d, min_pairs: %d\n", pairs, min_pairs );
-
- if ( ym2612.enabled() )
- {
- ym2612.begin_frame( buf );
- memset( buf, 0, pairs * stereo * sizeof *buf );
- }
- else if ( ym2413.enabled() )
- {
- ym2413.begin_frame( buf );
- }
-
- run_commands( vgm_time );
- ym2612.run_until( pairs );
- ym2413.run_until( pairs );
-
- fm_time_offset = (vgm_time * fm_time_factor + fm_time_offset) -
- ((long) pairs << fm_time_bits);
-
- psg.end_frame( blip_time );
-
- return pairs * stereo;
-}
-
-// Update pre-1.10 header FM rates by scanning commands
-void Vgm_Emu_Impl::update_fm_rates( long* ym2413_rate, long* ym2612_rate ) const
-{
- byte const* p = data + 0x40;
- while ( p < data_end )
- {
- switch ( *p )
- {
- case cmd_end:
- return;
-
- case cmd_psg:
- case cmd_byte_delay:
- p += 2;
- break;
-
- case cmd_delay:
- p += 3;
- break;
-
- case cmd_data_block:
- p += 7 + get_le32( p + 3 );
- break;
-
- case cmd_ym2413:
- *ym2612_rate = 0;
- return;
-
- case cmd_ym2612_port0:
- case cmd_ym2612_port1:
- *ym2612_rate = *ym2413_rate;
- *ym2413_rate = 0;
- return;
-
- case cmd_ym2151:
- *ym2413_rate = 0;
- *ym2612_rate = 0;
- return;
-
- default:
- p += command_len( *p );
- }
- }
-}
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