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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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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;
althrd_t thread;
} ALCnullBackend;
static int ALCnullBackend_mixerProc(void *ptr);
static void ALCnullBackend_Construct(ALCnullBackend *self, ALCdevice *device);
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, void, Destruct)
static ALCenum ALCnullBackend_open(ALCnullBackend *self, const ALCchar *name);
static void ALCnullBackend_close(ALCnullBackend *self);
static ALCboolean ALCnullBackend_reset(ALCnullBackend *self);
static ALCboolean ALCnullBackend_start(ALCnullBackend *self);
static void ALCnullBackend_stop(ALCnullBackend *self);
static DECLARE_FORWARD2(ALCnullBackend, ALCbackend, ALCenum, captureSamples, void*, ALCuint)
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, ALCuint, availableSamples)
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, ClockLatency, getClockLatency)
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, void, lock)
static DECLARE_FORWARD(ALCnullBackend, ALCbackend, void, unlock)
DECLARE_DEFAULT_ALLOCATORS(ALCnullBackend)
DEFINE_ALCBACKEND_VTABLE(ALCnullBackend);
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 int ALCnullBackend_mixerProc(void *ptr)
{
ALCnullBackend *self = (ALCnullBackend*)ptr;
ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice;
struct timespec now, start;
ALuint64 avail, done;
const long restTime = (long)((ALuint64)device->UpdateSize * 1000000000 /
device->Frequency / 2);
SetRTPriority();
althrd_setname(althrd_current(), MIXER_THREAD_NAME);
done = 0;
if(altimespec_get(&start, AL_TIME_UTC) != AL_TIME_UTC)
{
ERR("Failed to get starting time\n");
return 1;
}
while(!self->killNow && device->Connected)
{
if(altimespec_get(&now, AL_TIME_UTC) != AL_TIME_UTC)
{
ERR("Failed to get current time\n");
return 1;
}
avail = (now.tv_sec - start.tv_sec) * device->Frequency;
avail += (ALint64)(now.tv_nsec - start.tv_nsec) * device->Frequency / 1000000000;
if(avail < done)
{
/* Oops, time skipped backwards. Reset the number of samples done
* with one update available since we (likely) just came back from
* sleeping. */
done = avail - device->UpdateSize;
}
if(avail-done < device->UpdateSize)
al_nssleep(restTime);
else while(avail-done >= device->UpdateSize)
{
ALCnullBackend_lock(self);
aluMixData(device, NULL, device->UpdateSize);
ALCnullBackend_unlock(self);
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;
alstr_copy_cstr(&device->DeviceName, 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)
{
self->killNow = 0;
if(althrd_create(&self->thread, ALCnullBackend_mixerProc, self) != althrd_success)
return ALC_FALSE;
return ALC_TRUE;
}
static void ALCnullBackend_stop(ALCnullBackend *self)
{
int res;
if(self->killNow)
return;
self->killNow = 1;
althrd_join(self->thread, &res);
}
typedef struct ALCnullBackendFactory {
DERIVE_FROM_TYPE(ALCbackendFactory);
} ALCnullBackendFactory;
#define ALCNULLBACKENDFACTORY_INITIALIZER { { GET_VTABLE2(ALCnullBackendFactory, ALCbackendFactory) } }
ALCbackendFactory *ALCnullBackendFactory_getFactory(void);
static ALCboolean ALCnullBackendFactory_init(ALCnullBackendFactory *self);
static DECLARE_FORWARD(ALCnullBackendFactory, ALCbackendFactory, void, deinit)
static ALCboolean ALCnullBackendFactory_querySupport(ALCnullBackendFactory *self, ALCbackend_Type type);
static void ALCnullBackendFactory_probe(ALCnullBackendFactory *self, enum DevProbe type);
static ALCbackend* ALCnullBackendFactory_createBackend(ALCnullBackendFactory *self, ALCdevice *device, ALCbackend_Type type);
DEFINE_ALCBACKENDFACTORY_VTABLE(ALCnullBackendFactory);
ALCbackendFactory *ALCnullBackendFactory_getFactory(void)
{
static ALCnullBackendFactory factory = ALCNULLBACKENDFACTORY_INITIALIZER;
return STATIC_CAST(ALCbackendFactory, &factory);
}
static ALCboolean ALCnullBackendFactory_init(ALCnullBackendFactory* UNUSED(self))
{
return ALC_TRUE;
}
static ALCboolean ALCnullBackendFactory_querySupport(ALCnullBackendFactory* UNUSED(self), ALCbackend_Type type)
{
if(type == ALCbackend_Playback)
return ALC_TRUE;
return ALC_FALSE;
}
static void ALCnullBackendFactory_probe(ALCnullBackendFactory* UNUSED(self), enum DevProbe type)
{
switch(type)
{
case ALL_DEVICE_PROBE:
AppendAllDevicesList(nullDevice);
break;
case CAPTURE_DEVICE_PROBE:
break;
}
}
static ALCbackend* ALCnullBackendFactory_createBackend(ALCnullBackendFactory* UNUSED(self), ALCdevice *device, ALCbackend_Type type)
{
if(type == ALCbackend_Playback)
{
ALCnullBackend *backend;
NEW_OBJ(backend, ALCnullBackend)(device);
if(!backend) return NULL;
return STATIC_CAST(ALCbackend, backend);
}
return NULL;
}
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