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/**
* loopBucket - loads a sound file into a bucket loops it continuously
*
* usage: loopBucket file
*
* Demonstrates the usage of some low-level audio library functions
* and actions.
*
* $NCDId: @(#)loopBucket.c,v 1.2 1994/05/09 18:42:38 greg Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <audio/audiolib.h>
#include <audio/soundlib.h>
static void
fatalError(const char *message, const char *arg)
{
fprintf(stderr, message, arg);
fprintf(stderr, "\n");
exit(1);
}
static AuBool
EventHandler(AuServer *aud, AuEvent *ev, AuEventHandlerRec *handler)
{
AuBool *done = (AuBool *) handler->data;
AuElementNotifyEvent *event = (AuElementNotifyEvent *) ev;
if (ev->type == AuEventTypeElementNotify &&
event->kind == AuElementNotifyKindState &&
event->cur_state == AuStateStop)
*done = AuTrue;
return AuTrue;
}
int
main(int argc, char **argv)
{
AuServer *aud;
AuBucketID bucket;
AuBucketAttributes *ba;
AuDeviceID device = AuNone;
AuFlowID flow;
AuElement elements[2];
AuEventHandlerRec *handler;
AuElementAction actions[2];
AuBool done = AuFalse;
char *file = argv[1];
int i;
if (argc < 2)
fatalError("usage: loopBucket filename", NULL);
if (!(aud = AuOpenServer(NULL, 0, NULL, 0, NULL, NULL)))
exit(1);
if (!(bucket = AuSoundCreateBucketFromFile(aud, file, AuAccessAllMasks, &ba,
NULL)))
exit(1);
/* look for an output device */
for (i = 0; i < AuServerNumDevices(aud); i++)
if ((AuDeviceKind(AuServerDevice(aud, i)) ==
AuComponentKindPhysicalOutput) &&
AuDeviceNumTracks(AuServerDevice(aud, i)) == AuBucketNumTracks(ba))
{
device = AuDeviceIdentifier(AuServerDevice(aud, i));
break;
}
if (device == AuNone)
fatalError("Couldn't find an output device", NULL);
if (!(flow = AuCreateFlow(aud, NULL)))
fatalError("Couldn't create flow", NULL);
AuMakeChangeStateAction(&actions[0], AuStateStop, AuStateStart,
AuReasonEOF, flow, AuElementAll, AuStateStart);
AuMakeElementImportBucket(&elements[0], AuBucketSampleRate(ba), bucket,
AuUnlimitedSamples, 0, 1, actions);
AuMakeElementExportDevice(&elements[1], 0, device, AuBucketSampleRate(ba),
AuUnlimitedSamples, 0, NULL);
AuSetElements(aud, flow, AuTrue, 2, elements, NULL);
AuFreeBucketAttributes(aud, 1, ba);
if (!(handler = AuRegisterEventHandler(aud, AuEventHandlerIDMask,
0, flow, EventHandler,
(AuPointer) &done)))
fatalError("Couldn't register event handler", NULL);
AuStartFlow(aud, flow, NULL);
while (!done)
{
AuEvent ev;
AuNextEvent(aud, AuTrue, &ev);
AuDispatchEvent(aud, &ev);
}
AuUnregisterEventHandler(aud, handler);
AuDestroyFlow(aud, flow, NULL);
AuDestroyBucket(aud, bucket, NULL);
AuCloseServer(aud);
return 0;
}
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