/*
* 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 Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 "openalbridge.h"
#include "globals.h"
#include "wrappers.h"
#include "alc.h"
#include "loaders.h"
#ifdef __CPLUSPLUS
extern "C" {
#endif
/*Sources are points emitting sound*/
ALuint *Sources;
/*Buffers hold sound data*/
ALuint *Buffers;
/*index for Sources and Buffers*/
ALuint globalindex, globalsize, increment;
ALboolean openalReady = AL_FALSE;
ALfloat old_gain;
ALboolean openal_init(ALboolean usehardware, int memorysize) {
/*Initialize an OpenAL contex and allocate memory space for data and buffers*/
ALCcontext *context;
ALCdevice *device;
const ALCchar *default_device;
prog = "OpenAL subsystem";
// set the memory dimentsion and the increment width when reallocating
if (memorysize <= 0)
globalsize = 50;
else
globalsize = memorysize;
increment = globalsize;
// reuse old context but keep the new value for increment
if (openalReady == AL_TRUE) {
err_msg("(%s) WARN - already initialized", prog);
return AL_FALSE;
}
if (usehardware == AL_TRUE)
device = alcOpenDevice(NULL);
else
device = alcOpenDevice("Generic Software");
err_msg("(%s) INFO - Output device: %s", prog, alcGetString(device, ALC_DEVICE_SPECIFIER));
if (device == NULL) {
errno = ENODEV;
err_ret("(%s) WARN - failed to open sound device", prog);
return AL_FALSE;
}
context = alcCreateContext(device, NULL);
alcMakeContextCurrent(context);
alcProcessContext(context);
if (AlGetError("(%s) WARN - Failed to create a new contex") != AL_TRUE)
return AL_FALSE;
// allocate memory space for buffers and sources
Buffers = (ALuint*) Malloc(sizeof(ALuint)*globalsize);
Sources = (ALuint*) Malloc(sizeof(ALuint)*globalsize);
// set the listener gain, position (on xyz axes), velocity (one value for each axe) and orientation
// Position, Velocity and Orientation of the listener
ALfloat ListenerPos[] = {0.0, 0.0, 0.0};
ALfloat ListenerVel[] = {0.0, 0.0, 0.0};
ALfloat ListenerOri[] = {0.0, 0.0, -1.0, 0.0, 1.0, 0.0};
alListenerf (AL_GAIN, 1.0f );
alListenerfv(AL_POSITION, ListenerPos);
alListenerfv(AL_VELOCITY, ListenerVel);
alListenerfv(AL_ORIENTATION, ListenerOri);
if (AlGetError("(%s) WARN - Failed to set Listener properties") != AL_TRUE)
return AL_FALSE;
openalReady = AL_TRUE;
alGetError(); // clear any AL errors beforehand
return AL_TRUE;
}
void openal_close (void) {
/*Stop all sounds, deallocate all memory and close OpenAL */
ALCcontext *context;
ALCdevice *device;
if (openalReady == AL_FALSE) {
errno = EPERM;
err_ret("(%s) WARN - OpenAL not initialized", prog);
return;
}
alSourceStopv (globalsize, Sources);
alDeleteSources (globalsize, Sources);
alDeleteBuffers (globalsize, Buffers);
free(Sources);
free(Buffers);
context = alcGetCurrentContext();
device = alcGetContextsDevice(context);
alcMakeContextCurrent(NULL);
alcDestroyContext(context);
alcCloseDevice(device);
openalReady = AL_FALSE;
err_msg("(%s) INFO - closed", prog);
return AL_TRUE;
}
ALboolean openal_ready(void) {
return openalReady;
}
void helper_realloc (void) {
/*expands allocated memory when loading more sound files than expected*/
int oldsize = globalsize;
globalsize += increment;
err_msg("(%s) INFO - Realloc in process from %d to %d\n", prog, oldsize, globalsize);
Buffers = (ALuint*) Realloc(Buffers, sizeof(ALuint)*globalsize);
Sources = (ALuint*) Realloc(Sources, sizeof(ALuint)*globalsize);
return;
}
int openal_loadfile (const char *filename){
/*Open a file, load into memory and allocate the Source buffer for playing*/
ALfloat SourcePos[] = { 0.0, 0.0, 0.0 }; /*Position of the source sound*/
ALfloat SourceVel[] = { 0.0, 0.0, 0.0 }; /*Velocity of the source sound*/
ALenum format;
ALsizei bitsize, freq;
char *data;
uint32_t fileformat;
ALenum error;
FILE *fp;
if (openalReady == AL_FALSE) {
err_msg("(%s) WARN - not initialized", prog);
return -1;
}
/*when the buffers are all used, we can expand memory to accept new files*/
if (globalindex == globalsize)
helper_realloc();
/*detect the file format, as written in the first 4 bytes of the header*/
fp = Fopen (filename, "rb");
if (fp == NULL)
return -2;
error = fread (&fileformat, sizeof(uint32_t), 1, fp);
fclose (fp);
if (error < 0) {
err_msg("(%s) ERROR - File %s is too short", prog, filename);
return -3;
}
/*prepare the buffer to receive data*/
alGenBuffers(1, &Buffers[globalindex]);
if (AlGetError("(%s) ERROR - Failed to allocate memory for buffers") != AL_TRUE)
return -4;
/*prepare the source to emit sound*/
alGenSources(1, &Sources[globalindex]);
if (AlGetError("(%s) ERROR - Failed to allocate memory for sources") != AL_TRUE)
return -5;
switch (ENDIAN_BIG_32(fileformat)) {
case OGG_FILE_FORMAT:
error = load_oggvorbis (filename, &format, &data, &bitsize, &freq);
break;
case WAV_FILE_FORMAT:
error = load_wavpcm (filename, &format, &data, &bitsize, &freq);
break;
default:
err_msg ("(%s) ERROR - File format (%08X) not supported", prog, ENDIAN_BIG_32(fileformat));
return -6;
break;
}
/*copy pcm data in one buffer*/
alBufferData(Buffers[globalindex], format, data, bitsize, freq);
free(data); /*deallocate data to save memory*/
if (AlGetError("(%s) ERROR - Failed to write data to buffers") != AL_TRUE)
return -6;
/*set source properties that it will use when it's in playback*/
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 );
alSourcefv(Sources[globalindex], AL_VELOCITY, SourceVel );
alSourcei (Sources[globalindex], AL_LOOPING, 0 );
if (AlGetError("(%s) ERROR - Failed to set Source properties") != 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++;
}
void openal_playsound (uint32_t index) {
openal_playsound_loop (index, 0);
}
void openal_pausesound (uint32_t index) {
if (openalReady == AL_TRUE && index < globalsize)
alSourcePause(Sources[index]);
}
void openal_stopsound (uint32_t index) {
openal_stopsound_free(index, 0);
}
void openal_freesound (uint32_t index){
if (openalReady == AL_TRUE && index < globalsize)
alSourceStop(Sources[index]);
// STUB
}
void openal_playsound_loop (unsigned int index, char loops) {
if (openalReady == AL_TRUE && index < globalsize) {
alSourcePlay(Sources[index]);
if (loops != 0)
openal_toggleloop(index);
}
}
void openal_stopsound_free (unsigned int index, char freesource) {
if (openalReady == AL_TRUE && index < globalsize) {
alSourceStop(Sources[index]);
if (freesource != 0)
openal_freesound(index);
}
}
void openal_toggleloop (uint32_t index) {
ALint loop;
if (openalReady == AL_TRUE && index < globalsize) {
alGetSourcei (Sources[index], AL_LOOPING, &loop);
alSourcei (Sources[index], AL_LOOPING, !((uint8_t) loop) & 0x00000001);
}
}
void openal_setvolume (uint32_t index, float gain) {
if (openalReady == AL_TRUE && index < globalsize)
alSourcef (Sources[index], AL_GAIN, gain);
}
void openal_setglobalvolume (float gain) {
if (openalReady == AL_TRUE)
alListenerf (AL_GAIN, gain);
}
void openal_togglemute () {
ALfloat gain;
if (openalReady == AL_TRUE) {
alGetListenerf (AL_GAIN, &gain);
if (gain > 0) {
old_gain = gain;
gain = 0;
} else
gain = old_gain;
alListenerf (AL_GAIN, gain);
}
}
void openal_fade (uint32_t index, uint16_t quantity, char direction) {
/*Fade in or out by calling a helper thread*/
#ifndef _WIN32
pthread_t thread;
#else
HANDLE Thread;
DWORD threadID;
#endif
fade_t *fade;
if (openalReady == AL_TRUE && index < globalsize) {
fade = (fade_t*) Malloc(sizeof(fade_t));
fade->index = index;
fade->quantity = quantity;
if (direction > 0) {
#ifndef _WIN32
pthread_create(&thread, NULL, helper_fadein, (void*) fade);
#else
Thread = _beginthread(&helper_fadein, 0, (void*) fade);
#endif
} else {
#ifndef _WIN32
pthread_create(&thread, NULL, helper_fadeout, (void*) fade);
#else
Thread = _beginthread(&helper_fadeout, 0, (void*) fade);
#endif
}
#ifndef _WIN32
pthread_detach(thread);
#endif
}
}
void openal_fadeout (uint32_t index, uint16_t quantity) {
openal_fade(index, quantity, AL_FADE_OUT);
}
void openal_fadein (uint32_t index, uint16_t quantity) {
openal_fade(index, quantity, AL_FADE_IN);
}
void openal_setposition (uint32_t index, float x, float y, float z) {
if (openalReady == AL_TRUE && index < globalsize)
alSource3f(Sources[index], AL_POSITION, x, y, z);;
}
#ifdef __CPLUSPLUS
}
#endif