misc/libopenalbridge/openalbridge.c
author sheepluva
Thu, 29 Sep 2011 16:04:07 +0200
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/*
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* OpenAL Bridge - a simple portable library for OpenAL interface
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* Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "openalbridge.h"
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#include "globals.h"
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#include "al.h"
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#include "alc.h"
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#include "wrappers.h"
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#include "loaders.h"
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#include "string.h"
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// Sources are points emitting sound, their number is limited, but a single source can play many buffers
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// Buffers hold sound data and are unlimited
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ALuint *Sources;
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ALuint cache_size, cache_index, sources_number;
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ALboolean instances_number;
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al_sound_t *the_sounds;
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ALint cache_pointer;
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// Initialize an OpenAL contex and allocate memory space for data and buffers
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// It can be called twice to increase the cache size
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int openal_init (void) {
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    ALCcontext *context;
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    ALCdevice *device;
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    int i;
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    // reuse old context and resize the existing
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    if (openal_ready() == AL_TRUE) {
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        fprintf(stderr,"(Bridge Info) - already initialized\n");
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        instances_number++;
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        return AL_TRUE;
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    }
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    cache_pointer = 0;
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    instances_number++;
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    // initial memory size
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    cache_size = 50;
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    // open hardware device if present
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    device = alcOpenDevice(NULL);
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    sources_number = 16;
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    if (device == NULL) {
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        fprintf(stderr,"(Bridge Warning) - failed to open sound device, using software renderer\n");
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        device = alcOpenDevice("Generic Software");
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        sources_number = 32;
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        if (device == NULL) {
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            fprintf(stderr,"(Bridge ERROR) - failed to start software renderer, sound will be disabled\n");
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            return -1;
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        }
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    }
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    fprintf(stderr,"(Bridge Info) - output device: %s\n", alcGetString(device, ALC_DEVICE_SPECIFIER));
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    context = alcCreateContext(device, NULL);
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    alcMakeContextCurrent(context);
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    alcProcessContext(context);
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    if (AL_NO_ERROR != alGetError()) {
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        fprintf(stderr,"(Bridge ERROR) - Failed to create a new contex\n");
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        alcMakeContextCurrent(NULL);
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        alcDestroyContext(context);
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        alcCloseDevice(device);
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        return -2;
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    }
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    Sources = (ALuint *)Malloc (sizeof(ALuint) * sources_number);
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    alGenSources(sources_number, Sources);
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    // set the listener gain, position (on xyz axes), velocity (one value for each axe) and orientation
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    // Position, Velocity and Orientation of the listener
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    ALfloat ListenerPos[] = {0.0, 0.0, 0.0};
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    ALfloat ListenerVel[] = {0.0, 0.0, 0.0};
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    ALfloat ListenerOri[] = {0.0, 0.0, -1.0, 0.0, 1.0, 0.0};
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    alListenerf (AL_GAIN,        1.0f       );
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    alListenerfv(AL_POSITION,    ListenerPos);
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    alListenerfv(AL_VELOCITY,    ListenerVel);
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    alListenerfv(AL_ORIENTATION, ListenerOri);
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    if (AL_NO_ERROR != alGetError()) {
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        fprintf(stderr,"(Bridge ERROR) - Failed to set Listener properties\n");
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        return -3;
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    }
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    the_sounds = (al_sound_t *)Malloc (sizeof(al_sound_t) * cache_size);
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    for (i = 0; i < cache_size; i++)
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        the_sounds[i] = new_sound_el();
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    alGetError();
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    return AL_TRUE;
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}
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// Stop all sounds, deallocate all memory and close OpenAL context
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void openal_close (void) {
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    ALCcontext *context;
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    ALCdevice  *device;
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    int i;
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    if (instances_number == 0) {
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        fprintf(stderr,"(Bridge Warning) - OpenAL not initialized\n");
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        return;
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    }
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    instances_number--;
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    if (instances_number > 0) {
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        // release memory only when last session ends
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        return;
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    }
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    for (i = 0; i < cache_size; i++) {
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        openal_unloadfile(i);
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    }
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    free(the_sounds);
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    alSourceStopv (sources_number, Sources);
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    alDeleteSources (sources_number, Sources);
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    free(Sources);
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   136
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    context = alcGetCurrentContext();
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    device  = alcGetContextsDevice(context);
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    alcMakeContextCurrent(NULL);
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    alcDestroyContext(context);
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    alcCloseDevice(device);
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   143
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    fprintf(stderr,"(Bridge Info) - closed\n");
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    return;
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}
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ALboolean openal_ready (void) {
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    if (instances_number >= 1)
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        return AL_TRUE;
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    else
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        return AL_FALSE;
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}
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// Open a file, load into memory and allocate the Source buffer for playing
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int openal_loadfile (const char *filename){
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    ALenum format, error;
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    ALsizei bitsize, freq;
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    uint32_t fileformat;
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    al_sound_t sound_data;
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    int len, i, index = -1;
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    char *data;
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    FILE *fp;
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    if (openal_ready() == AL_FALSE) {
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        fprintf(stderr,"(Bridge Warning) - not initialized\n");
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        return -1;
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    }
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    // if this sound is already loaded return the index from the_sounds
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    len = strlen(filename);
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    for (i = 0; i < cache_size; i++) {
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        if (the_sounds[i].filename != NULL && strncmp(the_sounds[i].filename, filename, len) == 0) {
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#ifdef DEBUG
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            fprintf(stderr,"(Bridge Debug) - sound %d is already loaded\n", i);
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#endif
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            return i;
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        }
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        // if we don't have memory available search for a free element
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        if (cache_pointer >= cache_size)
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            if (the_sounds[i].is_used == AL_FALSE)
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                index = i;
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    }
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   187
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    if (index == -1 && cache_pointer >= cache_size) {
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        fprintf(stderr,"(Bridge Info) - No free spots found; doubling cache size\n", filename);
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        cache_size *= 2;
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        the_sounds = (al_sound_t *)Realloc (the_sounds, sizeof(al_sound_t) * cache_size);
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        for (i = cache_size - 50; i < cache_size; i++)
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            the_sounds[i] = new_sound_el();
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    } else
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        index = ++cache_pointer;
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   196
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   197
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    // detect the file format, as written in the first 4 bytes of the header
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    fp = Fopen (filename, "rb");
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    if (fp == NULL) {
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        fprintf(stderr,"(Bridge ERROR) - File %s not loaded\n", filename);
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        return -3;
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    }
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    error = fread (&fileformat, sizeof(uint32_t), 1, fp);
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    fclose (fp);
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    if (error < 0) {
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        fprintf(stderr,"(Bridge ERROR) - File %s is too short\n", filename);
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        return -4;
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   210
    }
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   211
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    switch (ENDIAN_BIG_32(fileformat)) {
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        case OGG_FILE_FORMAT:
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            error = load_oggvorbis (filename, &format, &data, &bitsize, &freq);
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   215
            break;
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   216
        case WAV_FILE_FORMAT:
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            error = load_wavpcm (filename, &format, &data, &bitsize, &freq);
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            break;
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   219
        default:
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            fprintf(stderr,"(Bridge ERROR) - File format (%08X) not supported\n", ENDIAN_BIG_32(fileformat));
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   221
            return -5;
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            break;
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   223
    }
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   224
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   225
    if (error != 0) {
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   226
        fprintf(stderr,"(Bridge ERROR) - error loading file %s\n", filename);
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        if(data)
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   228
            free(data);
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   229
        return -6;
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   230
    }
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   231
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   232
    // alGenBuffers happens here
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   233
    sound_data = init_sound_el(filename);
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   234
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   235
    if (AL_NO_ERROR != alGetError()) {
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   236
        fprintf(stderr,"(Bridge ERROR) - Failed to allocate memory for buffer %d\n", index);
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   237
        free(data);
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   238
        return -5;
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   239
    }
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   240
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   241
    // copy pcm data in one buffer and free it
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   242
    alBufferData(sound_data.buffer, format, data, bitsize, freq);
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    free(data);
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   244
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   245
    if (AL_NO_ERROR != alGetError()) {
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   246
        fprintf(stderr,"(Bridge ERROR) - Failed to write data to buffer %d\n", index);
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   247
        return -8;
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   248
    }
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   249
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   250
    // clear any AL errors beforehand
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   251
    alGetError();
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   252
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   253
    fprintf(stderr,"(Bridge Info) - successfully loaded %s\n", filename);
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   254
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   255
    // returns the index of the source you just loaded, increments it and exits
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   256
    the_sounds[index] = sound_data;
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   257
    return index;
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   258
}
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   259
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   260
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   261
void openal_unloadfile (uint32_t index) {
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   262
    ALint state;
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   263
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   264
    if (openal_ready() == AL_TRUE && index < cache_size && the_sounds[index].is_used == AL_TRUE) {
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   265
        alGetSourcei (Sources[the_sounds[index].source_index], AL_SOURCE_STATE, &state);
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   266
        if (state == AL_PLAYING || state == AL_PAUSED)
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   267
            openal_stopsound(index);
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   268
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   269
        // free memory and
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   270
        alDeleteBuffers (1, &the_sounds[index].buffer);
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        the_sounds[index] = new_sound_el();
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    }
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}