gpsp/sound.h

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/* gameplaySP
*
* Copyright (C) 2006 Exophase <exophase@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SOUND_H
#define SOUND_H
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#define BUFFER_SIZE (1 << 16)
#define BUFFER_SIZE_MASK (BUFFER_SIZE - 1)
#define GBA_SOUND_FREQUENCY (64 * 1024)
#ifdef OVERCLOCK_60FPS
#define GBC_BASE_RATE ((float)(60 * 228 * (272+960)))
#else
#define GBC_BASE_RATE ((float)(16 * 1024 * 1024))
#endif
#define DIRECT_SOUND_INACTIVE 0
#define DIRECT_SOUND_RIGHT 1
#define DIRECT_SOUND_LEFT 2
#define DIRECT_SOUND_LEFTRIGHT 3
typedef struct
{
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s8 fifo[32];
u32 fifo_base;
u32 fifo_top;
fixed8_24 fifo_fractional;
// The + 1 is to give some extra room for linear interpolation
// when wrapping around.
u32 buffer_index;
u32 status;
u32 volume_halve;
} direct_sound_struct;
#define GBC_SOUND_INACTIVE 0
#define GBC_SOUND_RIGHT 1
#define GBC_SOUND_LEFT 2
#define GBC_SOUND_LEFTRIGHT 3
typedef struct
{
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u32 rate;
fixed16_16 frequency_step;
fixed16_16 sample_index;
fixed16_16 tick_counter;
u32 total_volume;
u32 envelope_initial_volume;
u32 envelope_volume;
u32 envelope_direction;
u32 envelope_status;
u32 envelope_ticks;
u32 envelope_initial_ticks;
u32 sweep_status;
u32 sweep_direction;
u32 sweep_ticks;
u32 sweep_initial_ticks;
u32 sweep_shift;
u32 length_status;
u32 length_ticks;
u32 noise_type;
u32 wave_type;
u32 wave_bank;
u32 wave_volume;
u32 status;
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u32 active_flag;
u32 master_enable;
u32 sample_table_idx;
} gbc_sound_struct;
const extern s8 square_pattern_duty[4][8];
extern direct_sound_struct direct_sound_channel[2];
extern gbc_sound_struct gbc_sound_channel[4];
extern u32 gbc_sound_master_volume_left;
extern u32 gbc_sound_master_volume_right;
extern u32 gbc_sound_master_volume;
extern u32 gbc_sound_buffer_index;
extern u32 gbc_sound_last_cpu_ticks;
extern const u32 sound_frequency;
extern u32 sound_on;
void sound_timer_queue32(u32 channel, u32 value);
unsigned sound_timer(fixed8_24 frequency_step, u32 channel);
void sound_reset_fifo(u32 channel);
void render_gbc_sound();
void init_sound();
unsigned sound_write_savestate(u8 *dst);
bool sound_read_savestate(const u8 *src);
u32 sound_read_samples(s16 *out, u32 frames);
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void reset_sound(void);
#endif