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/**
* Copyright 1993 Network Computing Devices, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name Network Computing Devices, Inc. not be
* used in advertising or publicity pertaining to distribution of this
* software without specific, written prior permission.
*
* THIS SOFTWARE IS PROVIDED 'AS-IS'. NETWORK COMPUTING DEVICES, INC.,
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT
* LIMITATION ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NONINFRINGEMENT. IN NO EVENT SHALL NETWORK
* COMPUTING DEVICES, INC., BE LIABLE FOR ANY DAMAGES WHATSOEVER, INCLUDING
* SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF USE, DATA,
* OR PROFITS, EVEN IF ADVISED OF THE POSSIBILITY THEREOF, AND REGARDLESS OF
* WHETHER IN AN ACTION IN CONTRACT, TORT OR NEGLIGENCE, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $NCDId: @(#)monitor.c,v 1.1 1994/02/02 18:37:48 greg Exp $
*/
/* monitor a device */
#include "Alibint.h"
typedef struct
{
AuFlowID flow;
AuPointer callback_data;
void (*callback) (
AuServer *, AuEventHandlerRec *,
AuEvent *, AuPointer
);
} MonitorDeviceRec, *MonitorDevicePtr;
static AuBool
EventHandler(
AuServer *aud,
AuEvent *ev,
AuEventHandlerRec *handler
)
{
MonitorDevicePtr priv = (MonitorDevicePtr) handler->data;
switch (ev->type)
{
case AuEventTypeMonitorNotify:
if (priv->callback)
(*priv->callback) (aud, handler, ev, priv->callback_data);
break;
case AuEventTypeElementNotify:
{
AuElementNotifyEvent *event = (AuElementNotifyEvent *) ev;
if (event->kind == AuElementNotifyKindState &&
event->cur_state == AuStateStop)
{
if (priv->callback)
(*priv->callback) (aud, handler, ev,
priv->callback_data);
AuUnregisterEventHandler(aud, handler);
AuReleaseScratchFlow(aud, priv->flow, NULL);
Aufree(priv);
}
break;
}
}
return AuTrue;
}
/* sampling rate of the monitor (in Hz) */
int AuMonitorRate = 10;
/* format of the monitor data */
int AuMonitorFormat = AuFormatLinearSigned16MSB;
AuEventHandlerRec * AUCDECL
AuMonitorDevice(
AuServer *aud,
int rate,
AuDeviceID in_device,
AuDeviceID out_device,
AuFixedPoint volume,
void (*callback) (
AuServer *, AuEventHandlerRec *,
AuEvent *, AuPointer
),
AuPointer callback_data,
AuFlowID *pflow,
int *pmultelem,
int *pmonelem,
AuStatus *ret_status
)
{
AuElement elements[4];
AuElementState states[1];
AuElementAction actions[1];
AuEventHandlerRec *handler;
MonitorDevicePtr priv;
int numTracks,
i;
if (!(priv = (MonitorDevicePtr) Aumalloc(sizeof(MonitorDeviceRec))))
return NULL;
priv->callback = callback;
priv->callback_data = callback_data;
if ((priv->flow = AuGetScratchFlow(aud, NULL)) == AuNone)
{
Aufree(priv);
return NULL;
}
if (out_device == AuNone)
{
AuDeviceAttributes *d = NULL;
/* look up the input device attributes */
for (i = 0; i < AuServerNumDevices(aud); i++)
{
if (AuDeviceIdentifier(AuServerDevice(aud, i)) == in_device)
{
d = AuServerDevice(aud, i);
break;
}
}
if (!d)
{
Aufree(priv);
return NULL;
}
numTracks = AuDeviceNumTracks(d);
/* look for a matching output device */
for (i = 0; i < AuServerNumDevices(aud); i++)
if ((AuDeviceKind(AuServerDevice(aud, i)) ==
AuComponentKindPhysicalOutput) &&
AuDeviceNumTracks(AuServerDevice(aud, i)) == numTracks)
{
out_device = AuDeviceIdentifier(AuServerDevice(aud, i));
break;
}
if (out_device == AuNone)
{
Aufree(priv);
return NULL;
}
}
else
{
AuDeviceAttributes *d;
if (!(d = AuGetDeviceAttributes(aud, out_device, ret_status)))
{
Aufree(priv);
return NULL;
}
numTracks = AuDeviceNumTracks(d);
AuFreeDeviceAttributes(aud, 1, d);
}
AuMakeSendNotifyAction(&actions[0], AuStateStop, AuStateAny, AuReasonAny);
AuMakeElementImportDevice(&elements[0], rate, in_device, AuUnlimitedSamples,
1, actions);
AuMakeElementMultiplyConstant(&elements[1], 0, volume);
AuMakeElementExportDevice(&elements[2], 1, out_device, rate,
AuUnlimitedSamples, 0, NULL);
if (pmonelem)
{
i = 4;
*pmonelem = 3;
AuMakeElementExportMonitor(&elements[3], 0, AuMonitorRate,
AuMonitorFormat, numTracks);
}
else
i = 3;
/* set up the flow */
AuSetElements(aud, priv->flow, AuTrue, i, elements, ret_status);
if (!(handler = AuRegisterEventHandler(aud, AuEventHandlerIDMask,
0, priv->flow, EventHandler, priv)))
{
AuReleaseScratchFlow(aud, priv->flow, ret_status);
Aufree(priv);
return NULL;
}
/* start up the components */
AuMakeElementState(&states[0], priv->flow, AuElementAll, AuStateStart);
AuSetElementStates(aud, 1, states, ret_status);
if (pflow)
*pflow = priv->flow;
if (pmultelem)
*pmultelem = 1;
return handler;
}
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