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jack2/common/JackLoopbackDriver.cpp at develop · jackaudio/jack2 · GitHub
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common
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JackLoopbackDriver.cpp
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JackLoopbackDriver.cpp
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/*
Copyright (C) 2001 Paul Davis
Copyright (C) 2004-2008 Grame
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#
include
"
JackSystemDeps.h
"
#
include
"
JackLoopbackDriver.h
"
#
include
"
JackDriverLoader.h
"
#
include
"
JackEngineControl.h
"
#
include
"
JackGraphManager.h
"
#
include
"
JackError.h
"
#
include
<
iostream
>
#
include
<
assert.h
>
namespace
Jack
{
//
When used in "slave" mode
int
JackLoopbackDriver::ProcessReadSync
()
{
int
res =
0
;
//
Loopback copy
for
(
int
i =
0
; i <
fCaptureChannels
; i++) {
memcpy
(
GetInputBuffer
(i),
GetOutputBuffer
(i),
sizeof
(
jack_default_audio_sample_t
) *
fEngineControl
->
fBufferSize
);
}
//
Resume connected clients in the graph
if
(
ResumeRefNum
() <
0
) {
jack_error
(
"
JackLoopbackDriver::ProcessReadSync - ResumeRefNum error
"
);
res = -
1
;
}
return
res;
}
int
JackLoopbackDriver::ProcessWriteSync
()
{
//
Suspend on connected clients in the graph
if
(
SuspendRefNum
() <
0
) {
jack_error
(
"
JackLoopbackDriver::ProcessWriteSync - SuspendRefNum error
"
);
return
-
1
;
}
return
0
;
}
int
JackLoopbackDriver::ProcessReadAsync
()
{
int
res =
0
;
//
Loopback copy
for
(
int
i =
0
; i <
fCaptureChannels
; i++) {
memcpy
(
GetInputBuffer
(i),
GetOutputBuffer
(i),
sizeof
(
jack_default_audio_sample_t
) *
fEngineControl
->
fBufferSize
);
}
//
Resume connected clients in the graph
if
(
ResumeRefNum
() <
0
) {
jack_error
(
"
JackLoopbackDriver::ProcessReadAsync - ResumeRefNum error
"
);
res = -
1
;
}
return
res;
}
int
JackLoopbackDriver::ProcessWriteAsync
()
{
return
0
;
}
}
//
end of namespace
#
ifdef
__cplusplus
extern
"
C
"
{
#endif
SERVER_EXPORT
jack_driver_desc_t
*
driver_get_descriptor
()
{
jack_driver_desc_t
* desc;
jack_driver_desc_filler_t
filler;
jack_driver_param_value_t
value;
desc =
jack_driver_descriptor_construct
(
"
loopback
"
, JackDriverSlave,
"
Loopback backend
"
, &filler);
value.
i
=
0
;
jack_driver_descriptor_add_parameter
(desc, &filler,
"
channels
"
,
'
c
'
, JackDriverParamInt, &value,
NULL
,
"
Maximum number of loopback ports
"
,
NULL
);
return
desc;
}
SERVER_EXPORT
Jack::JackDriverClientInterface*
driver_initialize
(Jack::JackLockedEngine* engine, Jack::JackSynchro* table,
const
JSList* params)
{
const
JSList * node;
const
jack_driver_param_t
* param;
int
channels =
2
;
for
(node = params; node; node =
jack_slist_next
(node)) {
param = (
const
jack_driver_param_t
*) node->
data
;
switch
(param->
character
) {
case
'
c
'
:
channels = param->
value
.
ui
;
break
;
}
}
Jack::JackDriverClientInterface* driver =
new
Jack::JackLoopbackDriver
(engine, table);
if
(driver->
Open
(
0
,
0
,
1
,
1
, channels, channels,
false
,
"
loopback
"
,
"
loopback
"
,
0
,
0
) ==
0
) {
return
driver;
}
else
{
delete
driver;
return
NULL
;
}
}
#
ifdef
__cplusplus
}
#
endif
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