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beep.c
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C/C++ Source or Header
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1993-05-17
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3KB
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99 lines
/*
* beep.c
*
* Ultra-simple beep, for keyclick.c
* MWS, 5/92.
*
* Hacked from audio1.c (RKM companion disks)...
* ...Copyright (c) 1990 Commodore-Amiga, Inc.
*/
#include <exec/types.h> /* Some header files for system calls */
#include <exec/memory.h>
#include <devices/audio.h>
#include <graphics/gfxbase.h>
#include <proto/exec.h>
#include <proto/dos.h>
#include "beep.h" /* prototypes */
static UBYTE whichannel[] = {1, 2, 4, 8};
static struct IOAudio *AIOptr; /* Pointer to the IO block for IO commands */
static struct MsgPort *port; /* Pointer to a port so the device can reply */
UBYTE __chip data[] = {
0xEF, 0xFB, 0xF7, 0xF7, 0x12, 0x0F, 0xDA, 0xCC,
0x06, 0x20, 0x2A, 0x07, 0xC7, 0xB8, 0xD7, 0x15,
0x50, 0x38, 0xF4, 0xB1, 0x86, 0xD0, 0x24, 0x4D,
0x27, 0xEB, 0xBC, 0xAE, 0xD5, 0x0B, 0x1E, 0x08,
0xDE, 0xC1, 0xC9, 0xF4, 0x28, 0x2C, 0x07, 0xDE,
0xC3, 0xC6, 0xE4, 0x10, 0x20, 0x04, 0xE3, 0xD1,
0xD9, 0xEE, 0x13, 0x24, 0x15, 0xEC, 0xD1, 0xCC,
0xE4, 0x0B, 0x1E, 0x18, 0xF8, 0xDE, 0xD7, 0xE5,
0xFD, 0x13, 0x1A, 0x06, 0xE9, 0xDA, 0xE1, 0xF4,
0x08, 0x17, 0x16, 0xFB, 0xE1, 0xD4, 0xE4, 0xFD,
0x0E, 0x15, 0x0C, 0xF1, 0xDE, 0xE0, 0xF0, 0x00
};
#define SAMPLES sizeof(data)
#define DURATION 5
#define FREQUENCY 270
#define CLOCK 3579545 /* PAL clock - not crucial here */
void
FreeAudio () /* free allocated audio resources */
{
if (AIOptr)
{
FreeMem (AIOptr, sizeof (struct IOAudio));
AIOptr = NULL;
}
if (port)
{
DeleteMsgPort (port);
port = NULL;
}
}
BOOL
AllocAudio () /* allocate audio resources */
{
if ((AIOptr = (void *)AllocMem (sizeof (struct IOAudio), MEMF_PUBLIC | MEMF_CLEAR)) &&
(port = CreateMsgPort ()))
{
AIOptr->ioa_Request.io_Message.mn_ReplyPort = port;
AIOptr->ioa_Request.io_Message.mn_Node.ln_Pri = -50;
return TRUE;
}
FreeAudio ();
return FALSE;
}
void
beep (long volume)
{
static struct Message *msg; /* Pointer for the reply message */
AIOptr->ioa_Request.io_Command = ADCMD_ALLOCATE;
AIOptr->ioa_Request.io_Flags = ADIOF_NOWAIT;
AIOptr->ioa_AllocKey = 0;
AIOptr->ioa_Data = whichannel;
AIOptr->ioa_Length = sizeof (whichannel);
/** Open the audio device and allocate a channel **/
if (OpenDevice ("audio.device", 0L, (struct IORequest *) AIOptr, 0L))
return;
AIOptr->ioa_Request.io_Command = CMD_WRITE;
AIOptr->ioa_Request.io_Flags = ADIOF_PERVOL;
AIOptr->ioa_Data = (BYTE *)data;
AIOptr->ioa_Length = SAMPLES;
AIOptr->ioa_Period = CLOCK / (SAMPLES * FREQUENCY);
AIOptr->ioa_Cycles = (FREQUENCY * DURATION) / 1000;
AIOptr->ioa_Volume = volume;
BeginIO ((struct IORequest *) AIOptr);
WaitPort(port);
msg = GetMsg (port);
CloseDevice ((struct IORequest *) AIOptr);
}