Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

177 lines (140 sloc) 4.036 kB
/**
* 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>
#include "alMain.h"
#include "AL/al.h"
#include "AL/alc.h"
typedef struct {
ALvoid *buffer;
ALuint size;
volatile int killNow;
ALvoid *thread;
} null_data;
static const ALCchar nullDevice[] = "Null Output";
static ALuint NullProc(ALvoid *ptr)
{
ALCdevice *Device = (ALCdevice*)ptr;
null_data *data = (null_data*)Device->ExtraData;
ALuint frameSize;
ALuint now, last;
ALuint avail;
frameSize = aluFrameSizeFromFormat(Device->Format);
last = timeGetTime()<<8;
while(!data->killNow && Device->Connected)
{
now = timeGetTime()<<8;
avail = (ALuint64)(now-last) * Device->Frequency / (1000<<8);
if(avail < Device->UpdateSize)
{
Sleep(1);
continue;
}
while(avail >= Device->UpdateSize)
{
aluMixData(Device, data->buffer, Device->UpdateSize);
avail -= Device->UpdateSize;
last += (ALuint64)Device->UpdateSize * (1000<<8) / Device->Frequency;
}
}
return 0;
}
static ALCboolean null_open_playback(ALCdevice *device, const ALCchar *deviceName)
{
null_data *data;
if(!deviceName)
deviceName = nullDevice;
else if(strcmp(deviceName, nullDevice) != 0)
return ALC_FALSE;
data = (null_data*)calloc(1, sizeof(*data));
device->szDeviceName = strdup(deviceName);
device->ExtraData = data;
return ALC_TRUE;
}
static void null_close_playback(ALCdevice *device)
{
null_data *data = (null_data*)device->ExtraData;
free(data);
device->ExtraData = NULL;
}
static ALCboolean null_reset_playback(ALCdevice *device)
{
null_data *data = (null_data*)device->ExtraData;
data->size = device->UpdateSize * aluFrameSizeFromFormat(device->Format);
data->buffer = malloc(data->size);
if(!data->buffer)
{
AL_PRINT("buffer malloc failed\n");
return ALC_FALSE;
}
SetDefaultWFXChannelOrder(device);
data->thread = StartThread(NullProc, device);
if(data->thread == NULL)
{
free(data->buffer);
data->buffer = NULL;
return ALC_FALSE;
}
return ALC_TRUE;
}
static void null_stop_playback(ALCdevice *device)
{
null_data *data = (null_data*)device->ExtraData;
if(!data->thread)
return;
data->killNow = 1;
StopThread(data->thread);
data->thread = NULL;
data->killNow = 0;
free(data->buffer);
data->buffer = NULL;
}
static ALCboolean null_open_capture(ALCdevice *device, const ALCchar *deviceName)
{
(void)device;
(void)deviceName;
return ALC_FALSE;
}
BackendFuncs null_funcs = {
null_open_playback,
null_close_playback,
null_reset_playback,
null_stop_playback,
null_open_capture,
NULL,
NULL,
NULL,
NULL,
NULL
};
void alc_null_init(BackendFuncs *func_list)
{
*func_list = null_funcs;
}
void alc_null_deinit(void)
{
}
void alc_null_probe(int type)
{
if(type == DEVICE_PROBE)
AppendDeviceList(nullDevice);
else if(type == ALL_DEVICE_PROBE)
AppendAllDeviceList(nullDevice);
}
Jump to Line
Something went wrong with that request. Please try again.