diff options
Diffstat (limited to 'plugins/gme/game-music-emu-0.6.0/gme/Classic_Emu.cpp')
| -rw-r--r-- | plugins/gme/game-music-emu-0.6.0/gme/Classic_Emu.cpp | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Classic_Emu.cpp b/plugins/gme/game-music-emu-0.6.0/gme/Classic_Emu.cpp new file mode 100644 index 00000000..9b68a445 --- /dev/null +++ b/plugins/gme/game-music-emu-0.6.0/gme/Classic_Emu.cpp @@ -0,0 +1,184 @@ +// Game_Music_Emu 0.5.5. http://www.slack.net/~ant/ + +#include "Classic_Emu.h" + +#include "Multi_Buffer.h" +#include <string.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" + +Classic_Emu::Classic_Emu() +{ + buf = 0; + stereo_buffer = 0; + voice_types = 0; + + // avoid inconsistency in our duplicated constants + assert( (int) wave_type == (int) Multi_Buffer::wave_type ); + assert( (int) noise_type == (int) Multi_Buffer::noise_type ); + assert( (int) mixed_type == (int) Multi_Buffer::mixed_type ); +} + +Classic_Emu::~Classic_Emu() +{ + delete stereo_buffer; +} + +void Classic_Emu::set_equalizer_( equalizer_t const& eq ) +{ + Music_Emu::set_equalizer_( eq ); + update_eq( eq.treble ); + if ( buf ) + buf->bass_freq( (int) equalizer().bass ); +} + +blargg_err_t Classic_Emu::set_sample_rate_( long rate ) +{ + if ( !buf ) + { + if ( !stereo_buffer ) + CHECK_ALLOC( stereo_buffer = BLARGG_NEW Stereo_Buffer ); + buf = stereo_buffer; + } + return buf->set_sample_rate( rate, 1000 / 20 ); +} + +void Classic_Emu::mute_voices_( int mask ) +{ + Music_Emu::mute_voices_( mask ); + for ( int i = voice_count(); i--; ) + { + if ( mask & (1 << i) ) + { + set_voice( i, 0, 0, 0 ); + } + else + { + Multi_Buffer::channel_t ch = buf->channel( i, (voice_types ? voice_types [i] : 0) ); + assert( (ch.center && ch.left && ch.right) || + (!ch.center && !ch.left && !ch.right) ); // all or nothing + set_voice( i, ch.center, ch.left, ch.right ); + } + } +} + +void Classic_Emu::change_clock_rate( long rate ) +{ + clock_rate_ = rate; + buf->clock_rate( rate ); +} + +blargg_err_t Classic_Emu::setup_buffer( long rate ) +{ + change_clock_rate( rate ); + RETURN_ERR( buf->set_channel_count( voice_count() ) ); + set_equalizer( equalizer() ); + buf_changed_count = buf->channels_changed_count(); + return 0; +} + +blargg_err_t Classic_Emu::start_track_( int track ) +{ + RETURN_ERR( Music_Emu::start_track_( track ) ); + buf->clear(); + return 0; +} + +blargg_err_t Classic_Emu::play_( long count, sample_t* out ) +{ + long remain = count; + while ( remain ) + { + remain -= buf->read_samples( &out [count - remain], remain ); + if ( remain ) + { + if ( buf_changed_count != buf->channels_changed_count() ) + { + buf_changed_count = buf->channels_changed_count(); + remute_voices(); + } + int msec = buf->length(); + blip_time_t clocks_emulated = (blargg_long) msec * clock_rate_ / 1000; + RETURN_ERR( run_clocks( clocks_emulated, msec ) ); + assert( clocks_emulated ); + buf->end_frame( clocks_emulated ); + } + } + return 0; +} + +// Rom_Data + +blargg_err_t Rom_Data_::load_rom_data_( Data_Reader& in, + int header_size, void* header_out, int fill, long pad_size ) +{ + long file_offset = pad_size - header_size; + + rom_addr = 0; + mask = 0; + size_ = 0; + rom.clear(); + + file_size_ = in.remain(); + if ( file_size_ <= header_size ) // <= because there must be data after header + return gme_wrong_file_type; + blargg_err_t err = rom.resize( file_offset + file_size_ + pad_size ); + if ( !err ) + err = in.read( rom.begin() + file_offset, file_size_ ); + if ( err ) + { + rom.clear(); + return err; + } + + file_size_ -= header_size; + memcpy( header_out, &rom [file_offset], header_size ); + + memset( rom.begin() , fill, pad_size ); + memset( rom.end() - pad_size, fill, pad_size ); + + return 0; +} + +void Rom_Data_::set_addr_( long addr, int unit ) +{ + rom_addr = addr - unit - pad_extra; + + long rounded = (addr + file_size_ + unit - 1) / unit * unit; + if ( rounded <= 0 ) + { + rounded = 0; + } + else + { + int shift = 0; + unsigned long max_addr = (unsigned long) (rounded - 1); + while ( max_addr >> shift ) + shift++; + mask = (1L << shift) - 1; + } + + if ( addr < 0 ) + addr = 0; + size_ = rounded; + if ( rom.resize( rounded - rom_addr + pad_extra ) ) { } // OK if shrink fails + + if ( 0 ) + { + debug_printf( "addr: %X\n", addr ); + debug_printf( "file_size: %d\n", file_size_ ); + debug_printf( "rounded: %d\n", rounded ); + debug_printf( "mask: $%X\n", mask ); + } +} |