/*
* 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 "globals.h"
#include "wrappers.h"
#include "alc.h"
#include "loaders.h"
#include "endianness.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;
/*Position of the source sound*/
ALfloat SourcePos[] = { 0.0, 0.0, 0.0 };
/*Velocity of the source sound*/
ALfloat SourceVel[] = { 0.0, 0.0, 0.0 };
ALint openal_close(void) {
/*Stop all sounds, deallocate all memory and close OpenAL */
ALCcontext *context;
ALCdevice *device;
alSourceStopv (globalsize, Sources);
alDeleteSources (globalsize, Sources);
alDeleteBuffers (globalsize, Buffers);
free(Sources);
free(Buffers);
context = alcGetCurrentContext();
device = alcGetContextsDevice(context);
alcMakeContextCurrent(NULL);
alcDestroyContext(context);
alcCloseDevice(device);
return AL_TRUE;
}
ALint openal_init(uint32_t memorysize) {
/*Initialize an OpenAL contex and allocate memory space for data and 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;
increment = memorysize;
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*/
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;
}
uint8_t helper_realloc (void) {
/*expands allocated memory when loading more sound files than expected*/
globalsize += increment;
#ifdef DEBUG
fprintf(stderr, "OpenAL: Realloc in process %d\n", globalsize);
#endif
Buffers = (ALuint*) Realloc(Buffers, sizeof(ALuint)*globalsize);
Sources = (ALuint*) Realloc(Sources, sizeof(ALuint)*globalsize);
return 0;
}
uint32_t openal_loadfile (const char *filename){
/*Open a file, load into memory and allocate the Source buffer for playing*/
ALenum format;
ALsizei bitsize;
ALsizei freq;
char *data;
uint32_t fileformat;
ALenum error;
FILE *fp;
/*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 -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 buffer to receive data*/
alGenBuffers(1, &Buffers[globalindex]);
if (AlGetError("ERROR %d: Allocating memory for buffers\n") != AL_TRUE)
return -3;
/*prepare the source 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 -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("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 (uint32_t index){
/*Set or unset looping mode*/
ALint loop;
if (index >= globalsize) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", 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 (uint32_t index, uint8_t percentage) {
/*Set volume for sound number index*/
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);
return AL_FALSE;
}
if (percentage > 100)
percentage = 100;
alSourcef (Sources[index], AL_GAIN, (float) 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 (uint8_t percentage) {
/*Set volume for all sounds*/
if (percentage > 100)
percentage = 100;
alListenerf (AL_GAIN, (float) 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;
}
ALint openal_fade(uint32_t index, uint16_t quantity, uint8_t direction) {
/*Fade in or out by calling a helper thread*/
#ifndef _WIN32
pthread_t thread;
#else
HANDLE Thread;
DWORD threadID;
#endif
fade_t *fade;
fade = (fade_t*) Malloc(sizeof(fade_t));
fade->index = index;
fade->quantity = quantity;
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);
return AL_FALSE;
}
if (direction == FADE_IN)
#ifndef _WIN32
pthread_create(&thread, NULL, helper_fadein, (void*) fade);
#else
Thread = _beginthread(&helper_fadein, 0, (void*) fade);
#endif
else {
if (direction == FADE_OUT)
#ifndef _WIN32
pthread_create(&thread, NULL, helper_fadeout, (void*) fade);
#else
Thread = _beginthread(&helper_fadeout, 0, (void*) fade);
#endif
else {
fprintf(stderr, "ERROR: unknown direction for fade (%d)\n", direction);
free(fade);
return AL_FALSE;
}
}
#ifndef _WIN32
pthread_detach(thread);
#endif
alGetError(); /* clear any AL errors beforehand */
return AL_TRUE;
}
ALint openal_fadeout(uint32_t index, uint16_t quantity) {
/*wrapper for fadeout*/
return openal_fade(index, quantity, FADE_OUT);
}
ALint openal_fadein(uint32_t index, uint16_t quantity) {
/*wrapper for fadein*/
return openal_fade(index, quantity, FADE_IN);
}
ALint openal_playsound(uint32_t index){
/*Play sound number index*/
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", 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(uint32_t index){
/*Pause sound number index*/
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", 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(uint32_t index){
/*Stop sound number index*/
if (index >= globalindex) {
fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", 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