some win32 dll export thingy.
/*
* OpenAL Bridge - a simple portable library for OpenAL interface
* Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "openalwrap.h"
#ifdef __CPLUSPLUS
extern "C" {
#endif
typedef struct _fade_t {
int index;
unsigned int quantity;
} fade_t;
// Sources are points emitting sound.
ALuint *Sources;
// Buffers hold sound data.
ALuint *Buffers;
//index for Sources and Buffers
ALuint globalindex, globalsize;
// Position of the source sound.
ALfloat **SourcePos;
// Velocity of the source sound.
ALfloat **SourceVel;
ALint openal_close(void) {
/* This function stops all the sounds, deallocates all memory and closes OpenAL */
int i;
ALCcontext *context;
ALCdevice *device;
alSourceStopv (globalsize, Sources);
alDeleteSources (globalsize, Sources);
alDeleteBuffers (globalsize, Buffers);
for (i = 0; i < globalsize; i++) {
free(SourcePos[i]);
free(SourceVel[i]);
}
free(SourcePos);
free(SourceVel);
free(Sources);
free(Buffers);
context = alcGetCurrentContext();
device = alcGetContextsDevice(context);
alcMakeContextCurrent(NULL);
alcDestroyContext(context);
alcCloseDevice(device);
return AL_TRUE;
}
ALint openal_init(int memorysize) {
/* This function initializes an OpenAL contex, allocates memory space for data and prepares OpenAL buffers*/
ALCcontext *context;
ALCdevice *device;
const ALCchar *default_device;
// Position of the listener.
ALfloat ListenerPos[] = { 0.0, 0.0, 0.0 };
// Velocity of the listener.
ALfloat ListenerVel[] = { 0.0, 0.0, 0.0 };
// Orientation of the listener. (first 3 elements are "at", second 3 are "up")
ALfloat ListenerOri[] = { 0.0, 0.0, -1.0, 0.0, 1.0, 0.0 };
default_device = alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER);
fprintf(stderr, "Using default device: %s\n", default_device);
if ((device = alcOpenDevice(default_device)) == NULL) {
fprintf(stderr, "ERROR: Failed to open sound device\n");
return AL_FALSE;
}
context = alcCreateContext(device, NULL);
alcMakeContextCurrent(context);
alcProcessContext(context);
if (AlGetError("ERROR %d: Creating a new contex\n") != AL_TRUE)
return AL_FALSE;
//allocate memory space for buffers and sources
globalsize = memorysize;
Buffers = (ALuint*) Malloc(sizeof(ALuint )*globalsize);
Sources = (ALuint*) Malloc(sizeof(ALuint )*globalsize);
SourcePos = (ALfloat**) Malloc(sizeof(ALfloat*)*globalsize);
SourceVel = (ALfloat**) Malloc(sizeof(ALfloat*)*globalsize);
//set the listener gain, position (on xyz axes), velocity (one value for each axe) and orientation
alListenerf (AL_GAIN, 1.0f );
alListenerfv(AL_POSITION, ListenerPos);
alListenerfv(AL_VELOCITY, ListenerVel);
alListenerfv(AL_ORIENTATION, ListenerOri);
if (AlGetError("ERROR %d: Setting Listener properties\n") != AL_TRUE)
return AL_FALSE;
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
int openal_loadfile (const char *filename){
/* This function opens a file, loads into memory and allocates the Source buffer for playing*/
ALenum format;
ALsizei bitsize;
ALsizei freq;
uint8_t *data;
uint32_t fileformat;
int i, error;
FILE *fp;
/*detect the file format, as written in the first 4 bytes of the header*/
fp = Fopen (filename, "rb");
if (fp == NULL)
return -1;
error = fread (&fileformat, sizeof(uint32_t), 1, fp);
fclose (fp);
if (error < 0) {
fprintf(stderr, "ERROR: file %s is too short \n", filename);
return -2;
}
//prepare the buffers to receive data
alGenBuffers(1, &Buffers[globalindex]);
if (AlGetError("ERROR %d: Allocating memory for buffers\n") != AL_TRUE)
return -3;
//prepare the sources to emit sound
alGenSources(1, &Sources[globalindex]);
if (AlGetError("ERROR %d: Allocating memory for sources\n") != AL_TRUE)
return -4;
if (fileformat == 0x5367674F) //check if ogg
error = load_OggVorbis (filename, &format, &data, &bitsize, &freq);
else {
if (fileformat == 0x46464952) //check if wav
error = load_WavPcm (filename, &format, &data, &bitsize, &freq);
else {
fprintf(stderr, "ERROR: File format (%08X) not supported!\n", invert_endianness(fileformat));
return -5;
}
}
//copy pcm data in one buffer
alBufferData(Buffers[globalindex], format, data, bitsize, freq);
free(data); //deallocate data to save memory
if (AlGetError("ERROR %d: Writing data to buffer\n") != AL_TRUE)
return -5;
//memory allocation for source position and velocity
SourcePos[globalindex] = (ALfloat*) Malloc(sizeof(ALfloat)*3);
SourceVel[globalindex] = (ALfloat*) Malloc(sizeof(ALfloat)*3);
if (SourcePos[globalindex] == NULL || SourceVel[globalindex] == NULL)
return -6;
//source properties that it will use when it's in playback
for (i = 0; i < 3; i++) {
SourcePos[globalindex][i] = 0.0;
SourceVel[globalindex][i] = 0.1;
}
alSourcei (Sources[globalindex], AL_BUFFER, Buffers[globalindex] );
alSourcef (Sources[globalindex], AL_PITCH, 1.0f );
alSourcef (Sources[globalindex], AL_GAIN, 1.0f );
alSourcefv(Sources[globalindex], AL_POSITION, SourcePos[globalindex]);
alSourcefv(Sources[globalindex], AL_VELOCITY, SourceVel[globalindex]);
alSourcei (Sources[globalindex], AL_LOOPING, 0 );
if (AlGetError("ERROR %d: Setting source properties\n") != AL_TRUE)
return -7;
alGetError(); /* clear any AL errors beforehand */
//returns the index of the source you just loaded, increments it and exits
return globalindex++;
}
ALint openal_toggleloop (int index){
/*Set or unset looping mode*/
ALint loop;
if (index >= globalsize) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
return AL_FALSE;
}
alGetSourcei (Sources[index], AL_LOOPING, &loop);
alSourcei (Sources[index], AL_LOOPING, !((uint8_t) loop) & 0x00000001);
if (AlGetError("ERROR %d: Getting or setting loop property\n") != AL_TRUE)
return AL_FALSE;
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
ALint openal_setvolume (int index, unsigned char percentage) {
/*Set volume for sound number index*/
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
return AL_FALSE;
}
if (percentage > 100)
percentage = 100;
alSourcef (Sources[index], AL_GAIN, (ALfloat) percentage/100.0f);
if (AlGetError("ERROR %d: Setting volume for last sound\n") != AL_TRUE)
return AL_FALSE;
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
ALint openal_setglobalvolume (unsigned char percentage) {
/*Set volume for all sounds*/
if (percentage > 100)
percentage = 100;
alListenerf (AL_GAIN, (ALfloat) percentage/100.0f);
if (AlGetError("ERROR %d: Setting global volume\n") != AL_TRUE)
return AL_FALSE;
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
ALint openal_togglemute () {
/*Mute or unmute sound*/
ALfloat mute;
alGetListenerf (AL_GAIN, &mute);
if (mute > 0)
mute = 0;
else
mute = 1.0;
alListenerf (AL_GAIN, mute);
if (AlGetError("ERROR %d: Setting mute property\n") != AL_TRUE)
return AL_FALSE;
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
#ifndef _WIN32
void *helper_fadeout(void *tmp) {
#else
void WINAPI helper_fadeout(void *tmp) {
#endif
ALfloat gain;
fade_t *fade;
int index;
unsigned int quantity;
fade = tmp;
index = fade->index;
quantity = fade->quantity;
alGetSourcef(Sources[index], AL_GAIN, &gain);
for ( ; gain >= 0.00f; gain -= (float) quantity/10000){
#ifdef DEBUG
fprintf(stderr, "Fade-out: Set gain to %f\n", gain);
#endif
alSourcef(Sources[index], AL_GAIN, gain);
usleep(10000);
}
AlGetError("ERROR %d: Setting fade out volume\n");
//stop that sound and reset its gain
alSourceStop (Sources[index]);
alSourcef (Sources[index], AL_GAIN, 1.0f);
#ifndef _WIN32
pthread_exit(NULL);
#else
free(fade);
_endthread();
#endif
}
ALint openal_fadeout(int index, unsigned int quantity) {
#ifndef _WIN32
pthread_t thread;
fade_t fade;
fade.index = index;
fade.quantity = quantity;
#else
HANDLE Thread;
DWORD threadID;
fade_t *fade = malloc(sizeof(fade_t));
fade->index = index;
fade->quantity = quantity;
#endif
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
return AL_FALSE;
}
#ifndef _WIN32
pthread_create(&thread, NULL, helper_fadeout, (void*) &fade);
pthread_detach(thread);
#else
Thread = _beginthread(&helper_fadeout, 0, (void*) fade);
#endif
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
#ifndef _WIN32
void *helper_fadein(void *tmp)
#else
void WINAPI helper_fadein(void *tmp)
#endif
{
ALfloat gain;
fade_t *fade;
int index;
unsigned int quantity;
fade = tmp;
index = fade->index;
quantity = fade->quantity;
gain = 0.0f;
alSourcef(Sources[index], AL_GAIN, gain);
alSourcePlay(Sources[index]);
for ( ; gain <= 1.00f; gain += (float) quantity/10000){
#ifdef DEBUG
fprintf(stderr, "Fade-in: Set gain to: %f\n", gain);
#endif
alSourcef(Sources[index], AL_GAIN, gain);
usleep(10000);
}
if (AlGetError("ERROR %d: Setting fade in volume\n") != AL_TRUE)
return AL_FALSE;
#ifndef _WIN32
pthread_exit(NULL);
#else
free(fade);
_endthread();
#endif
}
ALint openal_fadein(int index, unsigned int quantity) {
#ifndef _WIN32
pthread_t thread;
fade_t fade;
fade.index = index;
fade.quantity = quantity;
#else
HANDLE Thread;
DWORD threadID;
fade_t *fade = malloc(sizeof(fade_t));
fade->index = index;
fade->quantity = quantity;
#endif
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
return AL_FALSE;
}
#ifndef _WIN32
pthread_create(&thread, NULL, helper_fadein, (void*) &fade);
pthread_detach(thread);
#else
Thread = _beginthread(&helper_fadein, 0, (void*) fade);
#endif
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
ALint openal_playsound(int index){
/*Play sound number index*/
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
return AL_FALSE;
}
alSourcePlay(Sources[index]);
if (AlGetError("ERROR %d: Playing last sound\n") != AL_TRUE)
return AL_FALSE;
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
ALint openal_pausesound(int index){
/*Pause sound number index*/
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
return AL_FALSE;
}
alSourcePause(Sources[index]);
if (AlGetError("ERROR %d: Pausing last sound\n") != AL_TRUE)
return AL_FALSE;
return AL_TRUE;
}
ALint openal_stopsound(int index){
/*Stop sound number index*/
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
return AL_FALSE;
}
alSourceStop(Sources[index]);
if (AlGetError("ERROR %d: Stopping last sound\n") != AL_TRUE)
return AL_FALSE;
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
#ifdef __CPLUSPLUS
}
#endif