--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/openalbridge/openalwrap.c Wed Jun 24 15:59:32 2009 +0000
@@ -0,0 +1,386 @@
+/*
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include "al.h"
+#include "alc.h"
+#include "openalwrap.h"
+#include "loaders.h"
+#include "wrappers.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;
+ // 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;
+ ALenum error;
+
+ 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 %d: Failed to open sound device\n", error);
+ 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;
+ }
+
+
+ ALint openal_fadeout(int index, unsigned int quantity) {
+ ALfloat gain;
+
+ if (index >= globalindex) {
+ fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
+ return AL_FALSE;
+ }
+
+ 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);
+ }
+
+ if (AlGetError("ERROR %d: Setting fade out volume\n") != AL_TRUE)
+ return AL_FALSE;
+
+ //stop that sound and reset its gain
+ alSourceStop (Sources[index]);
+ alSourcef (Sources[index], AL_GAIN, 1.0f);
+
+ alGetError(); /* clear any AL errors beforehand */
+
+ return AL_TRUE;
+ }
+
+
+ ALint openal_fadein(int index, unsigned int quantity) {
+ ALfloat gain;
+
+ if (index >= globalindex) {
+ fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)", index, globalindex);
+ return AL_FALSE;
+ }
+
+ 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;
+
+ 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