diff -r f589230fa21b -r 59dbd31e9953 misc/libopenalbridge/openalbridge.c --- /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 +* +* 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++; +}