audio.c

/** \file
 * Onscreen audio meters
 */
/*
 * Copyright (C) 2009 Trammell Hudson <hudson+ml@osresearch.net>
 * 
 * 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.
 */

#include "dryos.h"
#include "bmp.h"
#include "config.h"
#include "property.h"
#include "menu.h"

// Dump the audio registers to a file if defined
#undef CONFIG_AUDIO_REG_LOG


struct gain_struct
{
	struct semaphore *	sem;
	unsigned		alc1;
	unsigned		sig1;
	unsigned		sig2;
};

static struct gain_struct gain = {
	.sem			= (void*) 1,
};


// Set defaults
CONFIG_INT( "audio.mgain",	mgain,		4 );
CONFIG_INT( "audio.dgain.l",	dgain_l,	18 );
CONFIG_INT( "audio.dgain.r",	dgain_r,	18 );
CONFIG_INT( "audio.mic-power",	mic_power,	1 );
CONFIG_INT( "audio.lovl",	lovl,		3 );
CONFIG_INT( "audio.o2gain",	o2gain,		0 );
CONFIG_INT( "audio.alc-enable",	alc_enable,	0 );
CONFIG_INT( "audio.mic-in",	mic_in,		0 );
CONFIG_INT( "audio.loopback",	loopback,	1 );

static int do_draw_meters = 1;


struct audio_level
{
	int		last;
	int		avg;
	int		peak;
	int		pad;
};


struct audio_level audio_levels[2];



/** Returns a dB translated from the raw level
 *
 * Range is -40 to 0 dB
 */
static int
audio_level_to_db(
	int			raw_level
)
{
	int db;

	for( db = 40 ; db ; db-- )
	{
		if( audio_thresholds[db] > raw_level )
			return -db;
	}

	return 0;
}




#ifdef OSCOPE_METERS
void draw_meters(void)
{
#define MAX_SAMPLES 720
	static int16_t levels[ MAX_SAMPLES ];
	static uint32_t index;
	levels[ index++ ] = audio_read_level();
	if( index >= MAX_SAMPLES )
		index = 0;


	struct vram_info * vram = &vram_info[ vram_get_number(2) ];
	//thunk audio_dev_compute_average_level = (void*) 0xFF9725C4;
	//audio_dev_compute_average_level();

	// The level goes from -40 to 0
	uint32_t x;
	for( x=0 ; x<MAX_SAMPLES && x<vram->width ; x++ )
	{
		uint16_t y = 256 + levels[ x ] / 128;
		vram->vram[ y * vram->pitch + x ] = 0xFFFF;
	}

	uint32_t y;
	for( y=0 ; y<128 ; y++ )
	{
		vram->vram[ y * vram->pitch + index ] = 0x888F;
	}

}
#else


static uint8_t
db_to_color(
	int			db
)
{
	if( db < -35 )
		return 0x2F; // white
	if( db < -20 )
		return 0x06; // dark green
	if( db < -15 )
		return 0x0F; // yellow
	return 0x0c; // dull red
}

static uint8_t
db_peak_to_color(
	int			db
)
{
	if( db < -35 )
		return 0x7f; // dark blue
	if( db < -20 )
		return 0x7f; // dark blue
	if( db < -15 )
		return 0xAE; // bright yellow
	return 0x08; // bright red
}


static void
draw_meter(
	int			y_origin,
	struct audio_level *	level
)
{
	const uint32_t width = 600; // bmp_width();
	const uint32_t pitch = bmp_pitch();
	uint32_t * row = (uint32_t*) bmp_vram();
	if( !row )
		return;

	// Skip to the desired y coord and over the
	// space for the numerical levels
	row += (pitch/4) * y_origin + 8;

	const int db_avg = audio_level_to_db( level->avg );
	const int db_peak = audio_level_to_db( level->peak );

	// levels go from -40 to 0, so -40 * 15 == 600
	const uint32_t x_db_avg = (width + db_avg * 15) / 4;
	const uint32_t x_db_peak = (width + db_peak * 15) / 4;

	const uint8_t bar_color = db_to_color( db_avg );
	const uint8_t peak_color = db_peak_to_color( db_peak );
	const int meter_height = 12;

	const uint32_t bar_color_word = color_word( bar_color );
	const uint32_t peak_color_word = color_word( peak_color );
	const uint32_t bg_color_word = color_word( COLOR_BG );

	// Write the meter an entire scan line at a time
	int y;
	for( y=0 ; y<meter_height ; y++, row += pitch/4 )
	{
		uint32_t x;
		for( x=0 ; x<width/4 ; x++ )
		{
			if( x < x_db_avg )
				row[x] = bar_color_word;
			else
			if( x < x_db_peak )
				row[x] = bg_color_word;
			else
			if( x < x_db_peak + 4 )
				row[x] = peak_color_word;
			else
				row[x] = bg_color_word;
		}
	}

	// Write the current level
	bmp_printf( FONT_SMALL, 0, y_origin, "%3d", db_avg );
}


static void
draw_ticks(
	int		y,
	int		tick_height
)
{
	const uint32_t width = 600 + 8; // bmp_width();
	const uint32_t pitch = bmp_pitch();
	uint32_t * row = (uint32_t*) bmp_vram();
	if( !row )
		return;
	row += (pitch/4) * y;

	const uint32_t white_word = 0
		| ( COLOR_WHITE << 24 )
		| ( COLOR_WHITE << 16 )
		| ( COLOR_WHITE <<  8 )
		| ( COLOR_WHITE <<  0 );

	for( ; tick_height > 0 ; tick_height--, row += pitch/4 )
	{
		int db;
		for( db=-40; db<= 0 ; db+=5 )
		{
			const uint32_t x_db = width + db * 15;
			row[x_db/4] = white_word;
		}
	}
}


/* Normal VU meter */
static void draw_meters(void)
{
	// The db values are multiplied by 8 to make them
	// smoother.
	draw_meter( 0, &audio_levels[0] );
	draw_ticks( 12, 4 );
	draw_meter( 16, &audio_levels[1] );
}

#endif





static void
compute_audio_levels(
	int ch
)
{
	struct audio_level * const level = &audio_levels[ch];

	int raw = audio_read_level( ch );
	if( raw < 0 )
		raw = -raw;

	level->last	= raw;
	level->avg	= (level->avg * 15 + raw) / 16;
	if( raw > level->peak )
		level->peak = raw;

	// Decay the peak to the average
	level->peak = ( level->peak * 31 + level->avg ) / 32;
}


/** Task to monitor the audio levels.
 *
 * Compute the average and peak level, periodically calling
 * the draw_meters() function to display the results on screen.
 * \todo Check that we have live-view enabled and the TFT is on
 * before drawing.
 */
static void
meter_task( void * unused )
{
	DebugMsg( DM_MAGIC, 3, "!!!!! User task is running" );

	msleep( 4000 );

	while(!shutdown_requested)
	{
		msleep( 50 );

		if( do_draw_meters )
			draw_meters();
		else
			msleep( 500 );
	}
}


TASK_CREATE( "meter_task", meter_task, 0, 0x18, 0x1000 );


/** Monitor the audio levels very quickly */
static void
compute_audio_level_task( void * unused )
{
	msleep( 4000 );
	audio_levels[0].peak = audio_levels[1].peak = 0;
	audio_levels[0].avg = audio_levels[1].avg = 0;

	while(!shutdown_requested)
	{
		msleep( 16 );
		compute_audio_levels( 0 );
		compute_audio_levels( 1 );
	}
}

TASK_CREATE( "audio_level_task", compute_audio_level_task, 0, 0x1e, 0x1000 );


/** Write the MGAIN2-0 bits.
 * Table 19 for the gain values:
 *
 *       0 == +0 dB
 *       1 == +20 dB
 *       2 == +26 dB
 *       3 == +32 dB
 *       4 == +10 dB
 *       5 == +17 dB
 *       6 == +23 dB
 *       7 == +29 dB
 *
 * Why is it split between two registers?  I don't know.
 */
static inline void
audio_ic_set_mgain(
	unsigned		bits
)
{
	bits &= 0x7;
	unsigned sig1 = audio_ic_read( AUDIO_IC_SIG1 );
	sig1 &= ~0x3;
	sig1 |= (bits & 1);
	sig1 |= (bits & 4) >> 1;
	audio_ic_write( AUDIO_IC_SIG1 | sig1 );
	gain.sig1 = sig1;

	unsigned sig2 = audio_ic_read( AUDIO_IC_SIG2 );
	sig2 &= ~(1<<5);
	sig2 |= (bits & 2) << 4;
	audio_ic_write( AUDIO_IC_SIG2 | sig2 );
	gain.sig2 = sig2;
}


static inline uint8_t
audio_gain_to_cmd(
	int			gain
)
{
	unsigned cmd = ( gain * 1000 ) / 375 + 145;
	cmd &= 0xFF;

	return cmd;
}


static inline void
audio_ic_set_input_volume(
	int			channel,
	int			gain
)
{
	unsigned cmd = audio_gain_to_cmd( gain );
	if( channel )
		cmd |= AUDIO_IC_IVL;
	else
		cmd |= AUDIO_IC_IVR;

	audio_ic_write( cmd );
}


#ifdef CONFIG_AUDIO_REG_LOG

// Do not write the value; just read them and record to a logfile
static uint16_t audio_regs[] = {
	AUDIO_IC_PM1,
	AUDIO_IC_PM2,
	AUDIO_IC_SIG1,
	AUDIO_IC_SIG2,
	AUDIO_IC_ALC1,
	AUDIO_IC_ALC2,
	AUDIO_IC_IVL,
	AUDIO_IC_IVR,
	AUDIO_IC_OVL,
	AUDIO_IC_OVR,
	AUDIO_IC_ALCVOL,
	AUDIO_IC_MODE3,
	AUDIO_IC_MODE4,
	AUDIO_IC_PM3,
	AUDIO_IC_FIL1,
	AUDIO_IC_HPF0,
	AUDIO_IC_HPF1,
	AUDIO_IC_HPF2,
	AUDIO_IC_HPF3,
	AUDIO_IC_LPF0,
	AUDIO_IC_LPF1,
	AUDIO_IC_LPF2,
	AUDIO_IC_LPF3,
};

static const char * audio_reg_names[] = {
	"AUDIO_IC_PM1",
	"AUDIO_IC_PM2",
	"AUDIO_IC_SIG1",
	"AUDIO_IC_SIG2",
	"AUDIO_IC_ALC1",
	"AUDIO_IC_ALC2",
	"AUDIO_IC_IVL",
	"AUDIO_IC_IVR",
	"AUDIO_IC_OVL",
	"AUDIO_IC_OVR",
	"AUDIO_IC_ALCVOL",
	"AUDIO_IC_MODE3",
	"AUDIO_IC_MODE4",
	"AUDIO_IC_PM3",
	"AUDIO_IC_FIL1",
	"AUDIO_IC_HPF0",
	"AUDIO_IC_HPF1",
	"AUDIO_IC_HPF2",
	"AUDIO_IC_HPF3",
	"AUDIO_IC_LPF0",
	"AUDIO_IC_LPF1",
	"AUDIO_IC_LPF2",
	"AUDIO_IC_LPF3",
};

static FILE * reg_file;

static void
audio_reg_dump( int force )
{
	if( !reg_file )
		return;

	static uint16_t last_regs[ COUNT(audio_regs) ];

	unsigned i;
	int output = 0;
	for( i=0 ; i<COUNT(audio_regs) ; i++ )
	{
		const uint16_t reg = audio_ic_read( audio_regs[i] );

		if( reg != last_regs[i] || force )
		{
			fprintf(
				reg_file,
				"%s %02x\n",
				audio_reg_names[i],
				reg
			);
			output = 1;
		}

		last_regs[i] = reg;
	}

	if( output )
		fprintf( reg_file, "%s\n", "" );
}


static void
audio_reg_close( void )
{
	if( reg_file )
		FIO_CloseFile( reg_file );
	reg_file = NULL;
}

#endif


static void
audio_configure( int force )
{
#ifdef CONFIG_AUDIO_REG_LOG
	audio_reg_dump( force );
	return;
#endif

	if( !force )
	{
		// Check for ALC configuration; do nothing if it is
		// already disabled
		if( audio_ic_read( AUDIO_IC_ALC1 ) == gain.alc1
		&&  audio_ic_read( AUDIO_IC_SIG1 ) == gain.sig1
		&&  audio_ic_read( AUDIO_IC_SIG2 ) == gain.sig2
		)
			return;
		DebugMsg( DM_AUDIO, 3, "%s: Reseting user settings", __func__ );
	}

	audio_ic_write( AUDIO_IC_PM1 | 0x6D ); // power up ADC and DAC
	audio_ic_write( AUDIO_IC_SIG1
		| 0x10
		| ( mic_power ? 0x4 : 0x0 )
	); // power up, no gain

	audio_ic_write( AUDIO_IC_SIG2
		| 0x04 // external, no gain
		| ( lovl & 0x3) << 0 // line output level
	);

	if( mic_in )
		audio_ic_write( AUDIO_IC_PM3 | 0x00 ); // internal mic
	else
		audio_ic_write( AUDIO_IC_PM3 | 0x07 ); // external input

	gain.alc1 = alc_enable ? (1<<5) : 0;
	audio_ic_write( AUDIO_IC_ALC1 | gain.alc1 ); // disable all ALC

	// Control left/right gain independently
	audio_ic_write( AUDIO_IC_MODE4 | 0x00 );

	audio_ic_set_input_volume( 0, dgain_r );
	audio_ic_set_input_volume( 1, dgain_l );

	// 4 == 10 dB
	// 5 == 17 dB
	// 3 == 32 dB
	audio_ic_set_mgain( mgain ); // 10 dB

	// Disable the HPF
	//audio_ic_write( AUDIO_IC_HPF0 | 0x00 );
	//audio_ic_write( AUDIO_IC_HPF1 | 0x00 );
	//audio_ic_write( AUDIO_IC_HPF2 | 0x00 );
	//audio_ic_write( AUDIO_IC_HPF3 | 0x00 );

	// Enable the LPF
	// Canon uses F2A/B = 0x0ED4 and 0x3DA9.
	audio_ic_write( AUDIO_IC_LPF0 | 0xD4 );
	audio_ic_write( AUDIO_IC_LPF1 | 0x0E );
	audio_ic_write( AUDIO_IC_LPF2 | 0xA9 );
	audio_ic_write( AUDIO_IC_LPF3 | 0x3D );
	audio_ic_write( AUDIO_IC_FIL1
		| audio_ic_read( AUDIO_IC_FIL1 )
		| (1<<5)
	);

	// Enable loop mode and output digital volume2
	uint32_t mode3 = audio_ic_read( AUDIO_IC_MODE3 );
	mode3 &= ~0x5C; // disable loop, olvc, datt0/1
	audio_ic_write( AUDIO_IC_MODE3
		| mode3				// old value
		| loopback << 6		// loop mode
		| (o2gain & 0x3) << 2	// output volume
	);

	//draw_audio_regs();
	bmp_printf( FONT_SMALL, 500, 400,
		"Gain %d/%d Mgain %d",
		dgain_l,
		dgain_r,
		mgain
	);

	DebugMsg( DM_AUDIO, 3,
		"Gain mgain=%d dgain=%d/%d",
		mgain,
		dgain_l,
		dgain_r
	);
}


/** Menu handlers */

static void
audio_binary_toggle( void * priv )
{
	unsigned * ptr = priv;
	*ptr = !*ptr;
	audio_configure( 1 );
}


static void
audio_3bit_toggle( void * priv )
{
	unsigned * ptr = priv;
	*ptr = (*ptr + 0x1) & 0x3;
	audio_configure( 1 );
}




static void
audio_mgain_toggle( void * priv )
{
	unsigned * ptr = priv;
	*ptr = (*ptr + 0x1) & 0x7;
	audio_configure( 1 );
}


static void
audio_mgain_display( void * priv, int x, int y, int selected )
{
	static uint8_t gains[] = { 0, 20, 26, 32, 10, 17, 23, 29 };
	unsigned gain_reg= *(unsigned*) priv;
	gain_reg &= 0x7;

	bmp_printf(
		selected ? MENU_FONT_SEL : MENU_FONT,
		x, y,
		//23456789012
		"Anlg gain:  %2d dB",
		gains[ gain_reg ]
	);
}


static void
audio_dgain_toggle( void * priv )
{
	unsigned dgain = *(unsigned*) priv;
	dgain += 6;
	if( dgain > 40 )
		dgain = 0;
	*(unsigned*) priv = dgain;
	audio_configure( 1 );
}


static void
audio_dgain_display( void * priv, int x, int y, int selected )
{
	bmp_printf(
		selected ? MENU_FONT_SEL : MENU_FONT,
		x, y,
		// 23456789012
		"%s-Gain:     %2d dB",
		priv == &dgain_l ? "L" : "R",
		*(unsigned*) priv
	);
}


static void
audio_lovl_display( void * priv, int x, int y, int selected )
{
	bmp_printf(
		selected ? MENU_FONT_SEL : MENU_FONT,
		x, y,
		//23456789012
		"Output vol: %2d dB",
		2 * *(unsigned*) priv
	);
}


#if 0
static void
audio_o2gain_display( void * priv, int x, int y, int selected )
{
	static uint8_t gains[] = { 0, 6, 12, 18 };
	unsigned gain_reg= *(unsigned*) priv;
	gain_reg &= 0x3;

	bmp_printf(
		selected ? MENU_FONT_SEL : MENU_FONT,
		x, y,
		//23456789
		"o2gain:  -%2d dB",
		gains[ gain_reg ]
	);
}
#endif


static void
audio_alc_display( void * priv, int x, int y, int selected )
{
	bmp_printf(
		selected ? MENU_FONT_SEL : MENU_FONT,
		x, y,
		//23456789012
		"AGC:        %s",
		alc_enable ? "ON " : "OFF"
	);
}


static void
audio_mic_in_display( void * priv, int x, int y, int selected )
{
	bmp_printf(
		selected ? MENU_FONT_SEL : MENU_FONT,
		x, y,
		//23456789012
		"Input:      %s",
		mic_in ? "INT" : "EXT"
	);
}

static void
audio_loopback_display( void * priv, int x, int y, int selected )
{
	bmp_printf(
		selected ? MENU_FONT_SEL : MENU_FONT,
		x, y,
		//23456789012
		"Monitor:    %s",
		loopback ? "ON " : "OFF"
	);
}

static struct menu_entry audio_menus[] = {
	{
		.priv		= &lovl,
		.select		= audio_3bit_toggle,
		.display	= audio_lovl_display,
	},
#if 0
	{
		.priv		= &o2gain,
		.select		= audio_o2gain_toggle,
		.display	= audio_o2gain_display,
	},
#endif
	{
		.priv		= &mgain,
		.select		= audio_mgain_toggle,
		.display	= audio_mgain_display,
	},
	{
		.priv		= &dgain_l,
		.select		= audio_dgain_toggle,
		.display	= audio_dgain_display,
	},
	{
		.priv		= &dgain_r,
		.select		= audio_dgain_toggle,
		.display	= audio_dgain_display,
	},
	{
		.priv		= &alc_enable,
		.select		= audio_binary_toggle,
		.display	= audio_alc_display,
	},
	{
		.priv		= &mic_in,
		.select		= audio_binary_toggle,
		.display	= audio_mic_in_display,
	},
	{
		.priv		= &loopback,
		.select		= audio_binary_toggle,
		.display	= audio_loopback_display,
	},
#ifdef CONFIG_AUDIO_REG_LOG
	{
		.priv		= "Close register log",
		.select		= audio_reg_close,
		.display	= menu_print,
	},
#endif
};



static void
enable_recording(
	int			mode
)
{
	switch( mode )
	{
	case 0:
		// Movie recording stopped;  (fallthrough)
	case 2:
		// Movie recording started
		give_semaphore( gain.sem );
		break;
	case 1:
		// Movie recording about to start?
		break;
	default:
		// Uh?
		break;
	}
}

static void
enable_meters(
	int			mode
)
{
	loopback = do_draw_meters = !mode;
	audio_configure( 1 );
}



PROP_HANDLER( PROP_LV_ACTION )
{
	// Should we create the task instead?
	const unsigned mode = buf[0];
	enable_meters( mode );
	return prop_cleanup( token, property );
}

PROP_HANDLER( PROP_MVR_REC_START )
{
	const unsigned mode = buf[0];
	enable_recording( mode );
	return prop_cleanup( token, property );
}



/** Replace the sound dev task with our own to disable AGC.
 *
 * This task disables the AGC when the sound device is activated.
 */
void
my_sounddev_task( void )
{
	DebugMsg( DM_AUDIO, 3,
		"!!!!! %s started sem=%x",
		__func__,
		(uint32_t) sounddev.sem_alc
	);

	gain.sem = create_named_semaphore( "audio_gain", 1 );

	msleep( 2000 );

	// Fake the sound dev task parameters
	sounddev.sem_alc = create_named_semaphore( 0, 0 );

	sounddev_active_in(0,0);

	// Create the menu items
	menu_add( "Audio", audio_menus, COUNT(audio_menus) );
	audio_configure( 1 ); // force it this time

#ifdef CONFIG_AUDIO_REG_LOG
	// Create the logging file
	reg_file = FIO_CreateFile( "A:/audioregs.txt" );
#endif

	while(!shutdown_requested)
	{
		// will be unlocked by the property handler
		int rc = take_semaphore( gain.sem, 1000 );
		audio_configure( rc == 0 ); // force it if we got the semaphore
	}
}


TASK_OVERRIDE( sounddev_task, my_sounddev_task );


#if 0
/** Replace the audio level task with our own.
 *
 * This task runs when the sound device is activated to keep track of
 * the average audio level and translate it to dB.  Nothing ever seems
 * to activate it, so it is commented out for now.
 */
static void
my_audio_level_task( void )
{
	//const uint32_t * const thresholds = (void*) 0xFFC60ABC;
	DebugMsg( DM_AUDIO, 3, "!!!!! %s: Replaced Canon task %x", __func__, audio_level_task );

	audio_in.gain		= -40;
	audio_in.sample_count	= 0;
	audio_in.max_sample	= 0;
	audio_in.sem_interval	= create_named_semaphore( 0, 1 );
	audio_in.sem_task	= create_named_semaphore( 0, 0 );

	while(1)
	{
		DebugMsg( DM_AUDIO, 3, "%s: sleeping init=%d",
			__func__,
			audio_in.initialized
		);

		if( take_semaphore( audio_in.sem_interval, 0 ) & 1 )
		{
			//DebugAssert( "!IS_ERROR", "SoundDevice sem_interval", 0x82 );
			break;
		}

		if( take_semaphore( audio_in.sem_task, 0 ) & 1 )
		{
			//DebugAssert( "!IS_ERROR", SoundDevice", 0x83 );
			break;
		}

		DebugMsg( DM_AUDIO, 3, "%s: awake init=%d\n", __func__, audio_in.initialized );

		if( !audio_in.initialized )
		{
			DebugMsg( DM_AUDIO, 3, "**** %s: agc=%d/%d wind=%d volume=%d",
				__func__,
				audio_in.agc_on,
				audio_in.last_agc_on,
				audio_in.windcut,
				audio_in.volume
			);

			audio_set_filter_off();

			if( audio_in.last_agc_on == 1
			&&  audio_in.agc_on == 0
			)
				audio_set_alc_off();
			
			audio_in.last_agc_on = audio_in.agc_on;
			audio_set_windcut( audio_in.windcut );

			audio_set_sampling_param( 44100, 0x10, 1 );
			audio_set_volume_in(
				audio_in.agc_on,
				audio_in.volume
			);

			if( audio_in.agc_on == 1 )
				audio_set_alc_on();

			audio_in.initialized	= 1;
			audio_in.gain		= -39;
			audio_in.sample_count	= 0;

		}

		if( audio_in.asif_started == 0 )
		{
			DebugMsg( DM_AUDIO, 3, "%s: Starting asif observer", __func__ );
			audio_start_asif_observer();
			audio_in.asif_started = 1;
		}

		//uint32_t level = audio_read_level(0);
		give_semaphore( audio_in.sem_task );

		// Never adjust it!
		//set_audio_agc();
		//if( file != (void*) 0xFFFFFFFF )
			//FIO_WriteFile( file, &level, sizeof(level) );

		// audio_interval_wakeup will unlock our semaphore
		oneshot_timer( 0x200, audio_interval_unlock, audio_interval_unlock, 0 );
	}

	DebugMsg( DM_AUDIO, 3, "!!!!! %s task exited????", __func__ );
}


TASK_OVERRIDE( audio_level_task, my_audio_level_task );
#endif