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/*
* 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 <time.h>
#include <stdio.h>
#include <errno.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";
}
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mmsystem.h>
unsigned int altime_get(void)
{
static unsigned int start_time = 0;
unsigned int cur_time;
union {
FILETIME ftime;
ULARGE_INTEGER ulint;
} systime;
GetSystemTimeAsFileTime(&systime.ftime);
/* FILETIME is in 100-nanosecond units, or 1/10th of a microsecond. */
cur_time = (unsigned int)(systime.ulint.QuadPart/10000);
if(!start_time)
start_time = cur_time;
return cur_time - start_time;
}
void al_nssleep(unsigned long nsec)
{
Sleep(nsec / 1000000);
}
#else
#include <sys/time.h>
#include <time.h>
unsigned int altime_get(void)
{
static unsigned int start_time = 0u;
unsigned int cur_time;
#if _POSIX_TIMERS > 0
struct timespec ts;
int ret = clock_gettime(CLOCK_REALTIME, ts);
if(ret != 0) return 0;
cur_time = ts.ts_sec*1000 + ts.ts_nsec/1000000;
#else /* _POSIX_TIMERS > 0 */
struct timeval tv;
int ret = gettimeofday(&tv, NULL);
if(ret != 0) return 0;
cur_time = tv.tv_sec*1000 + tv.tv_usec/1000;
#endif
if(!start_time)
start_time = cur_time;
return cur_time - start_time;
}
void al_nssleep(unsigned long nsec)
{
struct timespec ts, rem;
ts.tv_sec = nsec / 1000000000ul;
ts.tv_nsec = nsec % 1000000000ul;
while(nanosleep(&ts, &rem) == -1 && errno == EINTR)
ts = rem;
}
#endif
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