[gpsp.git] / sound.h

/* 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

#define BUFFER_SIZE 65536

// A lot of sound cards on PC can't handle such small buffers but this
// seems to work well on PSP.

#ifdef PSP_BUILD

#define SOUND_BUFFER_SIZE 4096

#else

#define SOUND_BUFFER_SIZE 16384

#endif

typedef enum
{
  DIRECT_SOUND_INACTIVE,
  DIRECT_SOUND_RIGHT,
  DIRECT_SOUND_LEFT,
  DIRECT_SOUND_LEFTRIGHT
} direct_sound_status_type;

typedef enum
{
  DIRECT_SOUND_VOLUME_50,
  DIRECT_SOUND_VOLUME_100
} direct_sound_volume_type;

typedef struct
{
  s8 fifo[32];
  u32 fifo_base;
  u32 fifo_top;
  fixed16_16 fifo_fractional;
  // The + 1 is to give some extra room for linear interpolation
  // when wrapping around.
  u32 buffer_index;
  direct_sound_status_type status;
  direct_sound_volume_type volume;
  u32 last_cpu_ticks;
} direct_sound_struct;

typedef enum
{
  GBC_SOUND_INACTIVE,
  GBC_SOUND_RIGHT,
  GBC_SOUND_LEFT,
  GBC_SOUND_LEFTRIGHT
} gbc_sound_status_type;


typedef struct
{
  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_step;
  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;
  gbc_sound_status_type status;
  u32 active_flag;
  u32 master_enable;
  s8 *sample_data;
} gbc_sound_struct;

extern direct_sound_struct direct_sound_channel[2];
extern gbc_sound_struct gbc_sound_channel[4];
extern s8 square_pattern_duty[4][8];
extern u32 gbc_sound_master_volume_left;
extern u32 gbc_sound_master_volume_right;
extern u32 gbc_sound_master_volume;

extern u32 sound_frequency;
extern u32 sound_on;

extern u32 global_enable_audio;
extern u32 enable_low_pass_filter;
extern u32 audio_buffer_size_number;

extern SDL_mutex *sound_mutex;
extern SDL_cond *sound_cv;

void sound_timer_queue8(u32 channel, u8 value);
void sound_timer_queue16(u32 channel, u16 value);
void sound_timer_queue32(u32 channel, u32 value);
void sound_timer(fixed16_16 frequency_step, u32 channel);
void sound_reset_fifo(u32 channel);
void update_gbc_sound(u32 cpu_ticks);
void init_sound();
void sound_write_mem_savestate(file_tag_type savestate_file);
void sound_read_savestate(file_tag_type savestate_file);

#define gbc_sound_tone_control_low(channel, address)                          \
{                                                                             \
  u32 initial_volume = (value >> 12) & 0x0F;                                  \
  u32 envelope_ticks = ((value >> 8) & 0x07) * 4;                             \
  gbc_sound_channel[channel].length_ticks = 64 - (value & 0x3F);              \
  gbc_sound_channel[channel].sample_data =                                    \
   square_pattern_duty[(value >> 6) & 0x03];                                  \
  gbc_sound_channel[channel].envelope_direction = (value >> 11) & 0x01;       \
  gbc_sound_channel[channel].envelope_initial_volume = initial_volume;        \
  gbc_sound_channel[channel].envelope_volume = initial_volume;                \
  gbc_sound_channel[channel].envelope_initial_ticks = envelope_ticks;         \
  gbc_sound_channel[channel].envelope_ticks = envelope_ticks;                 \
  gbc_sound_channel[channel].envelope_status = (envelope_ticks != 0);         \
  gbc_sound_channel[channel].envelope_volume = initial_volume;                \
  gbc_sound_update = 1;                                                       \
  address16(io_registers, address) = value;                                   \
}                                                                             \

#define gbc_sound_tone_control_high(channel, address)                         \
{                                                                             \
  u32 rate = value & 0x7FF;                                                   \
  gbc_sound_channel[channel].rate = rate;                                     \
  gbc_sound_channel[channel].frequency_step =                                 \
   float_to_fp16_16(((131072.0 / (2048 - rate)) * 8.0) / sound_frequency);    \
  gbc_sound_channel[channel].length_status = (value >> 14) & 0x01;            \
  if(value & 0x8000)                                                          \
  {                                                                           \
    gbc_sound_channel[channel].active_flag = 1;                               \
    gbc_sound_channel[channel].sample_index -= float_to_fp16_16(1.0 / 12.0);  \
    gbc_sound_channel[channel].envelope_ticks =                               \
     gbc_sound_channel[channel].envelope_initial_ticks;                       \
    gbc_sound_channel[channel].envelope_volume =                              \
     gbc_sound_channel[channel].envelope_initial_volume;                      \
  }                                                                           \
                                                                              \
  gbc_sound_update = 1;                                                       \
  address16(io_registers, address) = value;                                   \
}                                                                             \

#define gbc_sound_tone_control_sweep()                                        \
{                                                                             \
  u32 sweep_ticks = ((value >> 4) & 0x07) * 2;                                \
  gbc_sound_channel[0].sweep_shift = value & 0x07;                            \
  gbc_sound_channel[0].sweep_direction = (value >> 3) & 0x01;                 \
  gbc_sound_channel[0].sweep_status = (value != 8);                           \
  gbc_sound_channel[0].sweep_ticks = sweep_ticks;                             \
  gbc_sound_channel[0].sweep_initial_ticks = sweep_ticks;                     \
  gbc_sound_update = 1;                                                       \
  address16(io_registers, 0x60) = value;                                      \
}                                                                             \

#define gbc_sound_wave_control()                                              \
{                                                                             \
  gbc_sound_channel[2].wave_type = (value >> 5) & 0x01;                       \
  gbc_sound_channel[2].wave_bank = (value >> 6) & 0x01;                       \
  if(value & 0x80)                                                            \
  {                                                                           \
    gbc_sound_channel[2].master_enable = 1;                                   \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    gbc_sound_channel[2].master_enable = 0;                                   \
  }                                                                           \
                                                                              \
  gbc_sound_update = 1;                                                       \
  address16(io_registers, 0x70) = value;                                      \
}                                                                             \

static u32 gbc_sound_wave_volume[4] = { 0, 16384, 8192, 4096 };

#define gbc_sound_tone_control_low_wave()                                     \
{                                                                             \
  gbc_sound_channel[2].length_ticks = 256 - (value & 0xFF);                   \
  if((value >> 15) & 0x01)                                                    \
  {                                                                           \
    gbc_sound_channel[2].wave_volume = 12288;                                 \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    gbc_sound_channel[2].wave_volume =                                        \
     gbc_sound_wave_volume[(value >> 13) & 0x03];                             \
  }                                                                           \
  gbc_sound_update = 1;                                                       \
  address16(io_registers, 0x72) = value;                                      \
}                                                                             \

#define gbc_sound_tone_control_high_wave()                                    \
{                                                                             \
  u32 rate = value & 0x7FF;                                                   \
  gbc_sound_channel[2].rate = rate;                                           \
  gbc_sound_channel[2].frequency_step =                                       \
   float_to_fp16_16((2097152.0 / (2048 - rate)) / sound_frequency);           \
  gbc_sound_channel[2].length_status = (value >> 14) & 0x01;                  \
  if(value & 0x8000)                                                          \
  {                                                                           \
    gbc_sound_channel[2].sample_index = 0;                                    \
    gbc_sound_channel[2].active_flag = 1;                                     \
  }                                                                           \
  gbc_sound_update = 1;                                                       \
  address16(io_registers, 0x74) = value;                                      \
}                                                                             \

#define gbc_sound_noise_control()                                             \
{                                                                             \
  u32 dividing_ratio = value & 0x07;                                          \
  u32 frequency_shift = (value >> 4) & 0x0F;                                  \
  if(dividing_ratio == 0)                                                     \
  {                                                                           \
    gbc_sound_channel[3].frequency_step =                                     \
     float_to_fp16_16(1048576.0 / (1 << (frequency_shift + 1)) /              \
     sound_frequency);                                                        \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    gbc_sound_channel[3].frequency_step =                                     \
     float_to_fp16_16(524288.0 / (dividing_ratio *                            \
     (1 << (frequency_shift + 1))) / sound_frequency);                        \
  }                                                                           \
  gbc_sound_channel[3].noise_type = (value >> 3) & 0x01;                      \
  gbc_sound_channel[3].length_status = (value >> 14) & 0x01;                  \
  if(value & 0x8000)                                                          \
  {                                                                           \
    gbc_sound_channel[3].sample_index = 0;                                    \
    gbc_sound_channel[3].active_flag = 1;                                     \
    gbc_sound_channel[3].envelope_ticks =                                     \
     gbc_sound_channel[3].envelope_initial_ticks;                             \
    gbc_sound_channel[3].envelope_volume =                                    \
     gbc_sound_channel[3].envelope_initial_volume;                            \
  }                                                                           \
  gbc_sound_update = 1;                                                       \
  address16(io_registers, 0x7C) = value;                                      \
}                                                                             \

#define gbc_trigger_sound_channel(channel)                                    \
  gbc_sound_master_volume_right = value & 0x07;                               \
  gbc_sound_master_volume_left = (value >> 4) & 0x07;                         \
  gbc_sound_channel[channel].status = ((value >> (channel + 8)) & 0x01) |     \
   ((value >> (channel + 11)) & 0x03)                                         \

#define gbc_trigger_sound()                                                   \
{                                                                             \
  gbc_trigger_sound_channel(0);                                               \
  gbc_trigger_sound_channel(1);                                               \
  gbc_trigger_sound_channel(2);                                               \
  gbc_trigger_sound_channel(3);                                               \
  address16(io_registers, 0x80) = value;                                      \
}                                                                             \

#define trigger_sound()                                                       \
{                                                                             \
  timer[0].direct_sound_channels = (((value >> 10) & 0x01) == 0) |            \
   ((((value >> 14) & 0x01) == 0) << 1);                                      \
  timer[1].direct_sound_channels = (((value >> 10) & 0x01) == 1) |            \
   ((((value >> 14) & 0x01) == 1) << 1);                                      \
  direct_sound_channel[0].volume = (value >> 2) & 0x01;                       \
  direct_sound_channel[0].status = (value >> 8) & 0x03;                       \
  direct_sound_channel[1].volume = (value >> 3) & 0x01;                       \
  direct_sound_channel[1].status = (value >> 12) & 0x03;                      \
  gbc_sound_master_volume = value & 0x03;                                     \
                                                                              \
  if((value >> 11) & 0x01)                                                    \
    sound_reset_fifo(0);                                                      \
  if((value >> 15) & 0x01)                                                    \
    sound_reset_fifo(1);                                                      \
  address16(io_registers, 0x82) = value;                                      \
}                                                                             \

#define sound_on()                                                            \
  if(value & 0x80)                                                            \
  {                                                                           \
    if(sound_on != 1)                                                         \
    {                                                                         \
      sound_on = 1;                                                           \
    }                                                                         \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    u32 i;                                                                    \
    for(i = 0; i < 4; i++)                                                    \
    {                                                                         \
      gbc_sound_channel[i].active_flag = 0;                                   \
    }                                                                         \
    sound_on = 0;                                                             \
  }                                                                           \
  address16(io_registers, 0x84) =                                             \
    (address16(io_registers, 0x84) & 0x000F) | (value & 0xFFF0);              \

#define sound_update_frequency_step(timer_number)                             \
  timer[timer_number].frequency_step =                                        \
   float_to_fp16_16(16777216.0 / (timer_reload * sound_frequency))            \


void reset_sound();
void sound_exit();

#endif
Commit	Line	Data
2823a4c8	1	/* gameplaySP
	2	*
	3	* Copyright (C) 2006 Exophase <exophase@gmail.com>
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License as
	7	* published by the Free Software Foundation; either version 2 of
	8	* the License, or (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
	19
	20	#ifndef SOUND_H
	21	#define SOUND_H
	22
	23	#define BUFFER_SIZE 65536
	24
	25	// A lot of sound cards on PC can't handle such small buffers but this
	26	// seems to work well on PSP.
	27
	28	#ifdef PSP_BUILD
	29
	30	#define SOUND_BUFFER_SIZE 4096
	31
	32	#else
	33
	34	#define SOUND_BUFFER_SIZE 16384
	35
	36	#endif
	37
	38	typedef enum
	39	{
	40	DIRECT_SOUND_INACTIVE,
	41	DIRECT_SOUND_RIGHT,
	42	DIRECT_SOUND_LEFT,
	43	DIRECT_SOUND_LEFTRIGHT
	44	} direct_sound_status_type;
	45
	46	typedef enum
	47	{
	48	DIRECT_SOUND_VOLUME_50,
	49	DIRECT_SOUND_VOLUME_100
	50	} direct_sound_volume_type;
	51
	52	typedef struct
	53	{
	54	s8 fifo[32];
	55	u32 fifo_base;
	56	u32 fifo_top;
	57	fixed16_16 fifo_fractional;
	58	// The + 1 is to give some extra room for linear interpolation
	59	// when wrapping around.
	60	u32 buffer_index;
	61	direct_sound_status_type status;
	62	direct_sound_volume_type volume;
	63	u32 last_cpu_ticks;
	64	} direct_sound_struct;
65
66	typedef enum
67	{
68	GBC_SOUND_INACTIVE,
69	GBC_SOUND_RIGHT,
70	GBC_SOUND_LEFT,
71	GBC_SOUND_LEFTRIGHT
72	} gbc_sound_status_type;
73
74
75	typedef struct
76	{
77	u32 rate;
78	fixed16_16 frequency_step;
79	fixed16_16 sample_index;
80	fixed16_16 tick_counter;
81	u32 total_volume;
82	u32 envelope_initial_volume;
83	u32 envelope_volume;
84	u32 envelope_direction;
85	u32 envelope_status;
86	u32 envelope_step;
87	u32 envelope_ticks;
88	u32 envelope_initial_ticks;
89	u32 sweep_status;
90	u32 sweep_direction;
91	u32 sweep_ticks;
92	u32 sweep_initial_ticks;
93	u32 sweep_shift;
94	u32 length_status;
95	u32 length_ticks;
96	u32 noise_type;
97	u32 wave_type;
98	u32 wave_bank;
99	u32 wave_volume;
100	gbc_sound_status_type status;
101	u32 active_flag;
102	u32 master_enable;
103	s8 *sample_data;
104	} gbc_sound_struct;
105
106	extern direct_sound_struct direct_sound_channel[2];
107	extern gbc_sound_struct gbc_sound_channel[4];
108	extern s8 square_pattern_duty[4][8];
109	extern u32 gbc_sound_master_volume_left;
110	extern u32 gbc_sound_master_volume_right;
111	extern u32 gbc_sound_master_volume;
112
113	extern u32 sound_frequency;
114	extern u32 sound_on;
115
116	extern u32 global_enable_audio;
117	extern u32 enable_low_pass_filter;
118	extern u32 audio_buffer_size_number;
119
120	extern SDL_mutex *sound_mutex;
121	extern SDL_cond *sound_cv;
122
123	void sound_timer_queue8(u32 channel, u8 value);
124	void sound_timer_queue16(u32 channel, u16 value);
125	void sound_timer_queue32(u32 channel, u32 value);
126	void sound_timer(fixed16_16 frequency_step, u32 channel);
127	void sound_reset_fifo(u32 channel);
128	void update_gbc_sound(u32 cpu_ticks);
129	void init_sound();
130	void sound_write_mem_savestate(file_tag_type savestate_file);
131	void sound_read_savestate(file_tag_type savestate_file);
132
133	#define gbc_sound_tone_control_low(channel, address) \
134	{ \
135	u32 initial_volume = (value >> 12) & 0x0F; \
136	u32 envelope_ticks = ((value >> 8) & 0x07) * 4; \
137	gbc_sound_channel[channel].length_ticks = 64 - (value & 0x3F); \
138	gbc_sound_channel[channel].sample_data = \
139	square_pattern_duty[(value >> 6) & 0x03]; \
140	gbc_sound_channel[channel].envelope_direction = (value >> 11) & 0x01; \
141	gbc_sound_channel[channel].envelope_initial_volume = initial_volume; \
142	gbc_sound_channel[channel].envelope_volume = initial_volume; \
143	gbc_sound_channel[channel].envelope_initial_ticks = envelope_ticks; \
144	gbc_sound_channel[channel].envelope_ticks = envelope_ticks; \
145	gbc_sound_channel[channel].envelope_status = (envelope_ticks != 0); \
146	gbc_sound_channel[channel].envelope_volume = initial_volume; \
147	gbc_sound_update = 1; \
148	address16(io_registers, address) = value; \
149	} \
150
151	#define gbc_sound_tone_control_high(channel, address) \
152	{ \
153	u32 rate = value & 0x7FF; \
154	gbc_sound_channel[channel].rate = rate; \
155	gbc_sound_channel[channel].frequency_step = \
156	float_to_fp16_16(((131072.0 / (2048 - rate)) * 8.0) / sound_frequency); \
157	gbc_sound_channel[channel].length_status = (value >> 14) & 0x01; \
158	if(value & 0x8000) \
159	{ \
160	gbc_sound_channel[channel].active_flag = 1; \
161	gbc_sound_channel[channel].sample_index -= float_to_fp16_16(1.0 / 12.0); \
162	gbc_sound_channel[channel].envelope_ticks = \
163	gbc_sound_channel[channel].envelope_initial_ticks; \
164	gbc_sound_channel[channel].envelope_volume = \
165	gbc_sound_channel[channel].envelope_initial_volume; \
166	} \
167	\
168	gbc_sound_update = 1; \
169	address16(io_registers, address) = value; \
170	} \
171
172	#define gbc_sound_tone_control_sweep() \
173	{ \
174	u32 sweep_ticks = ((value >> 4) & 0x07) * 2; \
175	gbc_sound_channel[0].sweep_shift = value & 0x07; \
176	gbc_sound_channel[0].sweep_direction = (value >> 3) & 0x01; \
177	gbc_sound_channel[0].sweep_status = (value != 8); \
178	gbc_sound_channel[0].sweep_ticks = sweep_ticks; \
179	gbc_sound_channel[0].sweep_initial_ticks = sweep_ticks; \
180	gbc_sound_update = 1; \
181	address16(io_registers, 0x60) = value; \
182	} \
183
184	#define gbc_sound_wave_control() \
185	{ \
186	gbc_sound_channel[2].wave_type = (value >> 5) & 0x01; \
187	gbc_sound_channel[2].wave_bank = (value >> 6) & 0x01; \
188	if(value & 0x80) \
189	{ \
190	gbc_sound_channel[2].master_enable = 1; \
191	} \
192	else \
193	{ \
194	gbc_sound_channel[2].master_enable = 0; \
195	} \
196	\
197	gbc_sound_update = 1; \
198	address16(io_registers, 0x70) = value; \
199	} \
200
201	static u32 gbc_sound_wave_volume[4] = { 0, 16384, 8192, 4096 };
202
203	#define gbc_sound_tone_control_low_wave() \
204	{ \
205	gbc_sound_channel[2].length_ticks = 256 - (value & 0xFF); \
206	if((value >> 15) & 0x01) \
207	{ \
208	gbc_sound_channel[2].wave_volume = 12288; \
209	} \
210	else \
211	{ \
212	gbc_sound_channel[2].wave_volume = \
213	gbc_sound_wave_volume[(value >> 13) & 0x03]; \
214	} \
215	gbc_sound_update = 1; \
216	address16(io_registers, 0x72) = value; \
217	} \
218
219	#define gbc_sound_tone_control_high_wave() \
220	{ \
221	u32 rate = value & 0x7FF; \
222	gbc_sound_channel[2].rate = rate; \
223	gbc_sound_channel[2].frequency_step = \
224	float_to_fp16_16((2097152.0 / (2048 - rate)) / sound_frequency); \
225	gbc_sound_channel[2].length_status = (value >> 14) & 0x01; \
226	if(value & 0x8000) \
227	{ \
228	gbc_sound_channel[2].sample_index = 0; \
229	gbc_sound_channel[2].active_flag = 1; \
230	} \
231	gbc_sound_update = 1; \
232	address16(io_registers, 0x74) = value; \
233	} \
234
235	#define gbc_sound_noise_control() \
236	{ \
237	u32 dividing_ratio = value & 0x07; \
238	u32 frequency_shift = (value >> 4) & 0x0F; \
239	if(dividing_ratio == 0) \
240	{ \
241	gbc_sound_channel[3].frequency_step = \
242	float_to_fp16_16(1048576.0 / (1 << (frequency_shift + 1)) / \
243	sound_frequency); \
244	} \
245	else \
246	{ \
247	gbc_sound_channel[3].frequency_step = \
248	float_to_fp16_16(524288.0 / (dividing_ratio * \
249	(1 << (frequency_shift + 1))) / sound_frequency); \
250	} \
251	gbc_sound_channel[3].noise_type = (value >> 3) & 0x01; \
252	gbc_sound_channel[3].length_status = (value >> 14) & 0x01; \
253	if(value & 0x8000) \
254	{ \
255	gbc_sound_channel[3].sample_index = 0; \
256	gbc_sound_channel[3].active_flag = 1; \
257	gbc_sound_channel[3].envelope_ticks = \
258	gbc_sound_channel[3].envelope_initial_ticks; \
259	gbc_sound_channel[3].envelope_volume = \
260	gbc_sound_channel[3].envelope_initial_volume; \
261	} \
262	gbc_sound_update = 1; \
263	address16(io_registers, 0x7C) = value; \
264	} \
265
266	#define gbc_trigger_sound_channel(channel) \
267	gbc_sound_master_volume_right = value & 0x07; \
268	gbc_sound_master_volume_left = (value >> 4) & 0x07; \
269	gbc_sound_channel[channel].status = ((value >> (channel + 8)) & 0x01) \| \
270	((value >> (channel + 11)) & 0x03) \
271
272	#define gbc_trigger_sound() \
273	{ \
274	gbc_trigger_sound_channel(0); \
275	gbc_trigger_sound_channel(1); \
276	gbc_trigger_sound_channel(2); \
277	gbc_trigger_sound_channel(3); \
278	address16(io_registers, 0x80) = value; \
279	} \
280
281	#define trigger_sound() \
282	{ \
283	timer[0].direct_sound_channels = (((value >> 10) & 0x01) == 0) \| \
284	((((value >> 14) & 0x01) == 0) << 1); \
285	timer[1].direct_sound_channels = (((value >> 10) & 0x01) == 1) \| \
286	((((value >> 14) & 0x01) == 1) << 1); \
287	direct_sound_channel[0].volume = (value >> 2) & 0x01; \
288	direct_sound_channel[0].status = (value >> 8) & 0x03; \
289	direct_sound_channel[1].volume = (value >> 3) & 0x01; \
290	direct_sound_channel[1].status = (value >> 12) & 0x03; \
291	gbc_sound_master_volume = value & 0x03; \
292	\
293	if((value >> 11) & 0x01) \
294	sound_reset_fifo(0); \
295	if((value >> 15) & 0x01) \
296	sound_reset_fifo(1); \
297	address16(io_registers, 0x82) = value; \
298	} \
299
300	#define sound_on() \
301	if(value & 0x80) \
302	{ \
303	if(sound_on != 1) \
304	{ \
305	sound_on = 1; \
306	} \
307	} \
308	else \
309	{ \
310	u32 i; \
311	for(i = 0; i < 4; i++) \
312	{ \
313	gbc_sound_channel[i].active_flag = 0; \
314	} \
315	sound_on = 0; \
316	} \
317	address16(io_registers, 0x84) = \
318	(address16(io_registers, 0x84) & 0x000F) \| (value & 0xFFF0); \
319
320	#define sound_update_frequency_step(timer_number) \
321	timer[timer_number].frequency_step = \
322	float_to_fp16_16(16777216.0 / (timer_reload * sound_frequency)) \
323
324
325	void reset_sound();
326	void sound_exit();
327
328	#endif