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/**
* OpenAL cross platform audio library
* Copyright (C) 2010 by Chris Robinson
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include <stdlib.h>
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
#include "alMain.h"
#include "alu.h"
#include "threads.h"
#include "compat.h"
#include "backends/base.h"
typedef struct ALCnullBackend {
DERIVE_FROM_TYPE(ALCbackend);
volatile int killNow;
althread_t thread;
} ALCnullBackend;
DECLARE_ALCBACKEND_VTABLE(ALCnullBackend);
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, void, Destruct)
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, ALint64, getLatency)
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, void, lock)
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, void, unlock)
static const ALCchar nullDevice[] = "No Output";
static void ALCnullBackend_Construct(ALCnullBackend *self, ALCdevice *device)
{
ALCbackend_Construct(STATIC_CAST(ALCbackend, self), device);
SET_VTABLE2(ALCnullBackend, ALCbackend, self);
}
static ALuint ALCnullBackend_mixerProc(ALvoid *ptr)
{
ALCnullBackend *self = (ALCnullBackend*)ptr;
ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice;
ALuint now, start;
ALuint64 avail, done;
SetRTPriority();
SetThreadName(MIXER_THREAD_NAME);
done = 0;
start = timeGetTime();
while(!self->killNow && device->Connected)
{
now = timeGetTime();
avail = (ALuint64)(now-start) * device->Frequency / 1000;
if(avail < done)
{
/* Timer wrapped (50 days???). Add the remainder of the cycle to
* the available count and reset the number of samples done */
avail += (U64(1)<<32)*device->Frequency/1000 - done;
done = 0;
}
if(avail-done < device->UpdateSize)
{
ALuint restTime = (ALuint)((device->UpdateSize - (avail-done)) * 1000 /
device->Frequency);
Sleep(restTime);
continue;
}
do {
aluMixData(device, NULL, device->UpdateSize);
done += device->UpdateSize;
} while(avail-done >= device->UpdateSize);
}
return 0;
}
static ALCenum ALCnullBackend_open(ALCnullBackend *self, const ALCchar *name)
{
ALCdevice *device;
if(!name)
name = nullDevice;
else if(strcmp(name, nullDevice) != 0)
return ALC_INVALID_VALUE;
device = STATIC_CAST(ALCbackend, self)->mDevice;
device->DeviceName = strdup(name);
return ALC_NO_ERROR;
}
static void ALCnullBackend_close(ALCnullBackend* UNUSED(self))
{
}
static ALCboolean ALCnullBackend_reset(ALCnullBackend *self)
{
SetDefaultWFXChannelOrder(STATIC_CAST(ALCbackend, self)->mDevice);
return ALC_TRUE;
}
static ALCboolean ALCnullBackend_start(ALCnullBackend *self)
{
if(!StartThread(&self->thread, ALCnullBackend_mixerProc, self))
return ALC_FALSE;
return ALC_TRUE;
}
static void ALCnullBackend_stop(ALCnullBackend *self)
{
if(!self->thread)
return;
self->killNow = 1;
StopThread(self->thread);
self->thread = NULL;
self->killNow = 0;
}
ALCenum ALCnullBackend_captureSamples(ALCnullBackend* UNUSED(self), void* UNUSED(buffer), ALCuint UNUSED(samples))
{
return ALC_INVALID_VALUE;
}
ALCuint ALCnullBackend_availableSamples(ALCnullBackend* UNUSED(self))
{
return 0;
}
static void ALCnullBackend_Delete(ALCnullBackend *self)
{
free(self);
}
DEFINE_ALCBACKEND_VTABLE(ALCnullBackend);
typedef struct ALCnullBackendFactory {
DERIVE_FROM_TYPE(ALCbackendFactory);
} ALCnullBackendFactory;
#define ALCNULLBACKENDFACTORY_INITIALIZER { { GET_VTABLE2(ALCnullBackendFactory, ALCbackendFactory) } }
ALCboolean ALCnullBackendFactory_init(ALCnullBackendFactory* UNUSED(self))
{
return ALC_TRUE;
}
void ALCnullBackendFactory_deinit(ALCnullBackendFactory* UNUSED(self))
{
}
ALCboolean ALCnullBackendFactory_querySupport(ALCnullBackendFactory* UNUSED(self), ALCbackend_Type type)
{
if(type == ALCbackend_Playback)
return ALC_TRUE;
return ALC_FALSE;
}
void ALCnullBackendFactory_probe(ALCnullBackendFactory* UNUSED(self), enum DevProbe type)
{
switch(type)
{
case ALL_DEVICE_PROBE:
AppendAllDevicesList(nullDevice);
break;
case CAPTURE_DEVICE_PROBE:
break;
}
}
ALCbackend* ALCnullBackendFactory_createBackend(ALCnullBackendFactory* UNUSED(self), ALCdevice *device, ALCbackend_Type type)
{
ALCnullBackend *backend;
assert(type == ALCbackend_Playback);
backend = calloc(1, sizeof(*backend));
if(!backend) return NULL;
ALCnullBackend_Construct(backend, device);
return STATIC_CAST(ALCbackend, backend);
}
DEFINE_ALCBACKENDFACTORY_VTABLE(ALCnullBackendFactory);
ALCbackendFactory *ALCnullBackendFactory_getFactory(void)
{
static ALCnullBackendFactory factory = ALCNULLBACKENDFACTORY_INITIALIZER;
return STATIC_CAST(ALCbackendFactory, &factory);
}
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