--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libopenalbridge/openalbridge.c Thu Jun 17 20:30:39 2010 +0200
@@ -0,0 +1,265 @@
+/*
+* 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 "al.h"
+#include "alc.h"
+#include "wrappers.h"
+#include "loaders.h"
+#include "string.h"
+
+// Sources are points emitting sound, their number is limited, but a single source can play many buffers
+// Buffers hold sound data and are unlimited
+ALuint *Sources;
+ALuint cache_size, cache_index, sources_number;
+ALboolean instances_number;
+al_sound_t *the_sounds;
+ALint cache_pointer;
+
+// Initialize an OpenAL contex and allocate memory space for data and buffers
+// It can be called twice to increase the cache size
+int openal_init (int memorysize) {
+ ALCcontext *context;
+ ALCdevice *device;
+ int i;
+
+ // reuse old context and resize the existing
+ if (openal_ready() == AL_TRUE) {
+ cache_size += memorysize;
+ fprintf(stderr,"(Bridge Info) - already initialized, resizing cache to %d\n", cache_size);
+ the_sounds = (al_sound_t *)Realloc (the_sounds, sizeof(al_sound_t) * cache_size);
+ for (i = cache_size - memorysize; i < cache_size; i++) {
+ the_sounds[i].filename = NULL;
+ the_sounds[i].buffer = -1;
+ the_sounds[i].source_index = -1;
+ the_sounds[i].stats = 0;
+ }
+ instances_number++;
+ return AL_TRUE;
+ }
+
+ cache_pointer = 0;
+ instances_number++;
+
+ // set the memory dimentsion and the increment width when reallocating
+ if (memorysize <= 0)
+ cache_size = 50;
+ else
+ cache_size = memorysize;
+
+ // open hardware device if present
+ device = alcOpenDevice(NULL);
+ sources_number = 16;
+ if (device == NULL) {
+ fprintf(stderr,"(Bridge Warning) - failed to open sound device, using software renderer\n");
+ device = alcOpenDevice("Generic Software");
+ sources_number = 32;
+ if (device == NULL) {
+ fprintf(stderr,"(Bridge ERROR) - failed to start software renderer, sound will be disabled\n");
+ return -1;
+ }
+ }
+
+ fprintf(stderr,"(Bridge Info) - output device: %s\n", alcGetString(device, ALC_DEVICE_SPECIFIER));
+
+ context = alcCreateContext(device, NULL);
+ alcMakeContextCurrent(context);
+ alcProcessContext(context);
+
+ if (AL_NO_ERROR != alGetError()) {
+ fprintf(stderr,"(Bridge ERROR) - Failed to create a new contex\n");
+ alcMakeContextCurrent(NULL);
+ alcDestroyContext(context);
+ alcCloseDevice(device);
+ return -2;
+ }
+
+ Sources = (ALuint *)Malloc (sizeof(ALuint) * sources_number);
+ alGenSources(sources_number, Sources);
+
+ // 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 (AL_NO_ERROR != alGetError()) {
+ fprintf(stderr,"(Bridge ERROR) - Failed to set Listener properties\n");
+ return -3;
+ }
+
+ the_sounds = (al_sound_t *)Malloc (sizeof(al_sound_t) * cache_size);
+ for (i = 0; i < cache_size; i++) {
+ the_sounds[i].filename = NULL;
+ the_sounds[i].buffer = -1;
+ the_sounds[i].source_index = -1;
+ the_sounds[i].stats = 0;
+ }
+
+ alGetError();
+ return AL_TRUE;
+}
+
+
+// Stop all sounds, deallocate all memory and close OpenAL context
+void openal_close (void) {
+ ALCcontext *context;
+ ALCdevice *device;
+ int i;
+
+ if (instances_number == 0) {
+ fprintf(stderr,"(Bridge Warning) - OpenAL not initialized\n");
+ return;
+ }
+
+ instances_number--;
+ if (instances_number > 0) {
+ return;
+ }
+
+ //TODO: free other stuff also
+ for (i = 0; i < cache_size; i++)
+ alDeleteBuffers (1, &the_sounds[i].buffer);
+ free(the_sounds);
+
+ alSourceStopv (sources_number, Sources);
+ alDeleteSources (sources_number, Sources);
+
+ free(Sources);
+
+ context = alcGetCurrentContext();
+ device = alcGetContextsDevice(context);
+
+ alcMakeContextCurrent(NULL);
+ alcDestroyContext(context);
+ alcCloseDevice(device);
+
+ fprintf(stderr,"(Bridge Info) - closed\n");
+
+ return;
+}
+
+
+ALboolean openal_ready (void) {
+ if (instances_number >= 1)
+ return AL_TRUE;
+ else
+ return AL_FALSE;
+}
+
+
+// Open a file, load into memory and allocate the Source buffer for playing
+int openal_loadfile (const char *filename){
+ ALenum format, error;
+ ALsizei bitsize, freq;
+ uint32_t fileformat;
+ al_sound_t soundData;
+ int len, i;
+ char *data;
+ FILE *fp;
+
+ if (openal_ready() == AL_FALSE) {
+ fprintf(stderr,"(Bridge Warning) - not initialized\n");
+ return -1;
+ }
+
+ // if this sound is already loaded return the index from the_sounds
+ len = strlen(filename);
+ for (i = 0; i < cache_size; i++) {
+ if (the_sounds[i].filename != NULL && strncmp(the_sounds[i].filename, filename, len) == 0) {
+#ifdef DEBUG
+ fprintf(stderr,"(Bridge Debug) - sound %d is already loaded\n", i);
+#endif
+ return i;
+ }
+ }
+
+ if (cache_pointer >= cache_size) {
+ fprintf(stderr,"(Bridge ERROR) - Cache size limit reached; consider allocating more space\n", filename);
+ return -2;
+ }
+
+ // detect the file format, as written in the first 4 bytes of the header
+ fp = Fopen (filename, "rb");
+
+ if (fp == NULL) {
+ fprintf(stderr,"(Bridge ERROR) - File %s not loaded\n", filename);
+ return -3;
+ }
+
+ error = fread (&fileformat, sizeof(uint32_t), 1, fp);
+ fclose (fp);
+
+ if (error < 0) {
+ fprintf(stderr,"(Bridge ERROR) - File %s is too short\n", filename);
+ return -4;
+ }
+
+ 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:
+ fprintf(stderr,"(Bridge ERROR) - File format (%08X) not supported\n", ENDIAN_BIG_32(fileformat));
+ return -5;
+ break;
+ }
+
+ if (error != 0) {
+ fprintf(stderr,"(Bridge ERROR) - error loading file %s\n", filename);
+ free(data);
+ return -6;
+ }
+
+ alGenBuffers(1, &soundData.buffer);
+ soundData.filename = filename;
+ soundData.source_index = -1;
+ soundData.stats = 0;
+
+ if (AL_NO_ERROR != alGetError()) {
+ fprintf(stderr,"(Bridge ERROR) - Failed to allocate memory for buffers\n");
+ return -5;
+ }
+
+ // copy pcm data in one buffer and free it
+ alBufferData(soundData.buffer, format, data, bitsize, freq);
+ free(data);
+
+ if (AL_NO_ERROR != alGetError()) {
+ fprintf(stderr,"(Bridge ERROR) - Failed to write data to buffers\n");
+ return -8;
+ }
+
+ // clear any AL errors beforehand
+ alGetError();
+
+ fprintf(stderr,"(Bridge Info) - successfully loaded %s\n", filename);
+
+ // returns the index of the source you just loaded, increments it and exits
+ the_sounds[cache_pointer] = soundData;
+ return cache_pointer++;
+}