author | nemo |
Fri, 12 Aug 2011 12:42:50 -0400 | |
changeset 5551 | 0897b947e7a0 |
parent 3697 | d5b30d6373fc |
permissions | -rw-r--r-- |
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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++) |
103 |
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++) { |
128 |
openal_unloadfile(i); |
|
129 |
} |
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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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135 |
free(Sources); |
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136 |
|
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137 |
context = alcGetCurrentContext(); |
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|
138 |
device = alcGetContextsDevice(context); |
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|
139 |
|
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|
140 |
alcMakeContextCurrent(NULL); |
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|
141 |
alcDestroyContext(context); |
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|
142 |
alcCloseDevice(device); |
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|
143 |
|
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144 |
fprintf(stderr,"(Bridge Info) - closed\n"); |
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|
145 |
|
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146 |
return; |
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|
147 |
} |
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|
148 |
|
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|
149 |
|
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150 |
ALboolean openal_ready (void) { |
3697 | 151 |
if (instances_number >= 1) |
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152 |
return AL_TRUE; |
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153 |
else |
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154 |
return AL_FALSE; |
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155 |
} |
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|
156 |
|
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|
157 |
|
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|
158 |
// Open a file, load into memory and allocate the Source buffer for playing |
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159 |
int openal_loadfile (const char *filename){ |
3513
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160 |
ALenum format, error; |
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161 |
ALsizei bitsize, freq; |
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162 |
uint32_t fileformat; |
3529 | 163 |
al_sound_t sound_data; |
164 |
int len, i, index = -1; |
|
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165 |
char *data; |
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166 |
FILE *fp; |
3697 | 167 |
|
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168 |
if (openal_ready() == AL_FALSE) { |
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169 |
fprintf(stderr,"(Bridge Warning) - not initialized\n"); |
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170 |
return -1; |
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171 |
} |
3697 | 172 |
|
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173 |
// if this sound is already loaded return the index from the_sounds |
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174 |
len = strlen(filename); |
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175 |
for (i = 0; i < cache_size; i++) { |
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|
176 |
if (the_sounds[i].filename != NULL && strncmp(the_sounds[i].filename, filename, len) == 0) { |
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|
177 |
#ifdef DEBUG |
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178 |
fprintf(stderr,"(Bridge Debug) - sound %d is already loaded\n", i); |
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179 |
#endif |
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180 |
return i; |
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181 |
} |
3529 | 182 |
// if we don't have memory available search for a free element |
183 |
if (cache_pointer >= cache_size) |
|
184 |
if (the_sounds[i].is_used == AL_FALSE) |
|
3697 | 185 |
index = i; |
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186 |
} |
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|
187 |
|
3529 | 188 |
if (index == -1 && cache_pointer >= cache_size) { |
189 |
fprintf(stderr,"(Bridge Info) - No free spots found; doubling cache size\n", filename); |
|
190 |
cache_size *= 2; |
|
191 |
the_sounds = (al_sound_t *)Realloc (the_sounds, sizeof(al_sound_t) * cache_size); |
|
3697 | 192 |
for (i = cache_size - 50; i < cache_size; i++) |
3529 | 193 |
the_sounds[i] = new_sound_el(); |
3697 | 194 |
} else |
3529 | 195 |
index = ++cache_pointer; |
3697 | 196 |
|
197 |
||
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198 |
// detect the file format, as written in the first 4 bytes of the header |
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199 |
fp = Fopen (filename, "rb"); |
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|
200 |
if (fp == NULL) { |
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|
201 |
fprintf(stderr,"(Bridge ERROR) - File %s not loaded\n", filename); |
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202 |
return -3; |
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|
203 |
} |
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|
204 |
|
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|
205 |
error = fread (&fileformat, sizeof(uint32_t), 1, fp); |
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|
206 |
fclose (fp); |
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|
207 |
if (error < 0) { |
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|
208 |
fprintf(stderr,"(Bridge ERROR) - File %s is too short\n", filename); |
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|
209 |
return -4; |
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|
210 |
} |
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|
211 |
|
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|
212 |
switch (ENDIAN_BIG_32(fileformat)) { |
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|
213 |
case OGG_FILE_FORMAT: |
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|
214 |
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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|
217 |
error = load_wavpcm (filename, &format, &data, &bitsize, &freq); |
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|
218 |
break; |
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|
219 |
default: |
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|
220 |
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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|
222 |
break; |
3360
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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); |
3529 | 227 |
if(data) |
228 |
free(data); |
|
3513
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|
229 |
return -6; |
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|
230 |
} |
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|
231 |
|
3529 | 232 |
// alGenBuffers happens here |
233 |
sound_data = init_sound_el(filename); |
|
3697 | 234 |
|
3513
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|
235 |
if (AL_NO_ERROR != alGetError()) { |
3529 | 236 |
fprintf(stderr,"(Bridge ERROR) - Failed to allocate memory for buffer %d\n", index); |
237 |
free(data); |
|
3513
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|
238 |
return -5; |
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|
239 |
} |
3697 | 240 |
|
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|
241 |
// copy pcm data in one buffer and free it |
3529 | 242 |
alBufferData(sound_data.buffer, format, data, bitsize, freq); |
3362
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|
243 |
free(data); |
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|
244 |
|
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|
245 |
if (AL_NO_ERROR != alGetError()) { |
3529 | 246 |
fprintf(stderr,"(Bridge ERROR) - Failed to write data to buffer %d\n", index); |
3364 | 247 |
return -8; |
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|
248 |
} |
3697 | 249 |
|
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|
250 |
// clear any AL errors beforehand |
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|
251 |
alGetError(); |
3362
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|
252 |
|
3513
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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 |
3529 | 256 |
the_sounds[index] = sound_data; |
257 |
return index; |
|
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|
258 |
} |
3529 | 259 |
|
260 |
||
261 |
void openal_unloadfile (uint32_t index) { |
|
262 |
ALint state; |
|
263 |
||
264 |
if (openal_ready() == AL_TRUE && index < cache_size && the_sounds[index].is_used == AL_TRUE) { |
|
265 |
alGetSourcei (Sources[the_sounds[index].source_index], AL_SOURCE_STATE, &state); |
|
266 |
if (state == AL_PLAYING || state == AL_PAUSED) |
|
267 |
openal_stopsound(index); |
|
3697 | 268 |
|
269 |
// free memory and |
|
3529 | 270 |
alDeleteBuffers (1, &the_sounds[index].buffer); |
271 |
the_sounds[index] = new_sound_el(); |
|
272 |
} |
|
3697 | 273 |
} |