--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/openalbridge/openalbridge.c Wed Aug 19 13:49:47 2009 +0000
@@ -0,0 +1,464 @@
+/*
+ * 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 "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;
+
+ ALboolean openalReady = AL_FALSE;
+
+ ALboolean openal_close (void) {
+ /*Stop all sounds, deallocate all memory and close OpenAL */
+ ALCcontext *context;
+ ALCdevice *device;
+
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ 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;
+
+ return AL_TRUE;
+ }
+
+ ALboolean openal_ready(void) {
+ return openalReady;
+ }
+
+ ALboolean 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 };
+
+ if(openalReady == AL_TRUE) {
+ fprintf(stderr, "ERROR: OpenAL already initialized\n");
+ return AL_FALSE;
+ }
+
+ 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*/
+ if (memorysize == 0)
+ globalsize = 50;
+ else
+ globalsize = memorysize;
+ increment = globalsize;
+ 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;
+
+ openalReady = AL_TRUE;
+
+ alGetError(); /* clear any AL errors beforehand */
+ return AL_TRUE;
+ }
+
+
+ ALboolean helper_realloc (void) {
+ /*expands allocated memory when loading more sound files than expected*/
+ int oldsize = globalsize;
+ globalsize += increment;
+
+#ifdef DEBUG
+ fprintf(stderr, "OpenAL: Realloc in process from %d to %d\n", oldsize, globalsize);
+#endif
+
+ Buffers = (ALuint*) Realloc(Buffers, sizeof(ALuint)*globalsize);
+ Sources = (ALuint*) Realloc(Sources, sizeof(ALuint)*globalsize);
+
+ return AL_TRUE;
+ }
+
+
+ ALint 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) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ /*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++;
+ }
+
+
+ ALboolean openal_toggleloop (uint32_t index){
+ /*Set or unset looping mode*/
+ ALint loop;
+
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ 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;
+ }
+
+
+ ALboolean openal_setvolume (uint32_t index, uint8_t percentage) {
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ /*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 (AlGetError2("ERROR %d: setting volume for sound %d\n", index) != AL_TRUE)
+ return AL_FALSE;
+
+ alGetError(); /* clear any AL errors beforehand */
+
+ return AL_TRUE;
+ }
+
+
+ ALboolean openal_setglobalvolume (uint8_t percentage) {
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ /*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;
+ }
+
+
+ ALboolean openal_togglemute () {
+ /*Mute or unmute sound*/
+ ALfloat mute;
+
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ 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;
+ }
+
+
+ ALboolean openal_fade (uint32_t index, uint16_t quantity, ALboolean 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_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ 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;
+ }
+
+
+ ALboolean openal_fadeout (uint32_t index, uint16_t quantity) {
+ /*wrapper for fadeout*/
+ return openal_fade(index, quantity, FADE_OUT);
+ }
+
+
+ ALboolean openal_fadein (uint32_t index, uint16_t quantity) {
+ /*wrapper for fadein*/
+ return openal_fade(index, quantity, FADE_IN);
+ }
+
+
+ ALboolean openal_setposition (uint32_t index, float x, float y, float z) {
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+ if (index >= globalindex) {
+ fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);
+ return AL_FALSE;
+ }
+
+ alSource3f(Sources[index], AL_POSITION, x, y, z);
+ if (AlGetError2("ERROR %d: setting position for sound %d\n", index) != AL_TRUE)
+ return AL_FALSE;
+
+ return AL_TRUE;
+ }
+
+
+ ALboolean openal_playsound (uint32_t index){
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ /*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 (AlGetError2("ERROR %d: Playing sound %d\n", index) != AL_TRUE)
+ return AL_FALSE;
+
+ alGetError(); /* clear any AL errors beforehand */
+
+ return AL_TRUE;
+ }
+
+
+ ALboolean openal_pausesound(uint32_t index){
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ /*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 (AlGetError2("ERROR %d: Pausing sound %d\n", index) != AL_TRUE)
+ return AL_FALSE;
+
+ return AL_TRUE;
+ }
+
+
+ ALboolean openal_stopsound(uint32_t index){
+ if(openalReady == AL_FALSE) {
+ fprintf(stderr, "ERROR: OpenAL not initialized\n");
+ return AL_FALSE;
+ }
+
+ /*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 (AlGetError2("ERROR %d: Stopping sound %d\n", index) != AL_TRUE)
+ return AL_FALSE;
+
+ alGetError(); /* clear any AL errors beforehand */
+
+ return AL_TRUE;
+ }
+
+#ifdef __CPLUSPLUS
+}
+#endif