117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/*
|
|
* OpenAL Helpers
|
|
*
|
|
* Copyright (c) 2011 by Chris Robinson <chris.kcat@gmail.com>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
/* This file contains routines to help with some menial OpenAL-related tasks,
|
|
* such as opening a device and setting up a context, closing the device and
|
|
* destroying its context, converting between frame counts and byte lengths,
|
|
* finding an appropriate buffer format, and getting readable strings for
|
|
* channel configs and sample types. */
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "AL/al.h"
|
|
#include "AL/alc.h"
|
|
#include "AL/alext.h"
|
|
|
|
#include "alhelpers.h"
|
|
|
|
|
|
/* InitAL opens a device and sets up a context using default attributes, making
|
|
* the program ready to call OpenAL functions. */
|
|
int InitAL(char ***argv, int *argc)
|
|
{
|
|
const ALCchar *name;
|
|
ALCdevice *device;
|
|
ALCcontext *ctx;
|
|
|
|
/* Open and initialize a device */
|
|
device = NULL;
|
|
if(argc && argv && *argc > 1 && strcmp((*argv)[0], "-device") == 0)
|
|
{
|
|
device = alcOpenDevice((*argv)[1]);
|
|
if(!device)
|
|
fprintf(stderr, "Failed to open \"%s\", trying default\n", (*argv)[1]);
|
|
(*argv) += 2;
|
|
(*argc) -= 2;
|
|
}
|
|
if(!device)
|
|
device = alcOpenDevice(NULL);
|
|
if(!device)
|
|
{
|
|
fprintf(stderr, "Could not open a device!\n");
|
|
return 1;
|
|
}
|
|
|
|
ctx = alcCreateContext(device, NULL);
|
|
if(ctx == NULL || alcMakeContextCurrent(ctx) == ALC_FALSE)
|
|
{
|
|
if(ctx != NULL)
|
|
alcDestroyContext(ctx);
|
|
alcCloseDevice(device);
|
|
fprintf(stderr, "Could not set a context!\n");
|
|
return 1;
|
|
}
|
|
|
|
name = NULL;
|
|
if(alcIsExtensionPresent(device, "ALC_ENUMERATE_ALL_EXT"))
|
|
name = alcGetString(device, ALC_ALL_DEVICES_SPECIFIER);
|
|
if(!name || alcGetError(device) != AL_NO_ERROR)
|
|
name = alcGetString(device, ALC_DEVICE_SPECIFIER);
|
|
printf("Opened \"%s\"\n", name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* CloseAL closes the device belonging to the current context, and destroys the
|
|
* context. */
|
|
void CloseAL(void)
|
|
{
|
|
ALCdevice *device;
|
|
ALCcontext *ctx;
|
|
|
|
ctx = alcGetCurrentContext();
|
|
if(ctx == NULL)
|
|
return;
|
|
|
|
device = alcGetContextsDevice(ctx);
|
|
|
|
alcMakeContextCurrent(NULL);
|
|
alcDestroyContext(ctx);
|
|
alcCloseDevice(device);
|
|
}
|
|
|
|
|
|
const char *FormatName(ALenum format)
|
|
{
|
|
switch(format)
|
|
{
|
|
case AL_FORMAT_MONO8: return "Mono, U8";
|
|
case AL_FORMAT_MONO16: return "Mono, S16";
|
|
case AL_FORMAT_STEREO8: return "Stereo, U8";
|
|
case AL_FORMAT_STEREO16: return "Stereo, S16";
|
|
}
|
|
return "Unknown Format";
|
|
}
|