1 /* |
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2 * OpenAL Bridge - a simple portable library for OpenAL interface |
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3 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com> |
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4 * |
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5 * This program is free software; you can redistribute it and/or modify |
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6 * it under the terms of the GNU Lesser General Public License as published by |
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7 * the Free Software Foundation; version 2 of the License |
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8 * |
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9 * This program is distributed in the hope that it will be useful, |
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 * GNU Lesser General Public License for more details. |
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13 * |
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14 * You should have received a copy of the GNU Lesser General Public License |
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15 * along with this program; if not, write to the Free Software |
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16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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17 */ |
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18 |
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19 #include "openalbridge.h" |
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20 #include "globals.h" |
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21 #include "al.h" |
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22 #include "alc.h" |
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23 #include "wrappers.h" |
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24 #include "loaders.h" |
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25 #include "string.h" |
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26 |
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27 // Sources are points emitting sound, their number is limited, but a single source can play many buffers |
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28 // Buffers hold sound data and are unlimited |
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29 ALuint *Sources; |
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30 ALuint cache_size, cache_index, sources_number; |
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31 ALboolean instances_number; |
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32 al_sound_t *the_sounds; |
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33 ALint cache_pointer; |
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34 |
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35 // Initialize an OpenAL contex and allocate memory space for data and buffers |
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36 // It can be called twice to increase the cache size |
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37 int openal_init (void) { |
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38 ALCcontext *context; |
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39 ALCdevice *device; |
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40 int i; |
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41 |
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42 // reuse old context and resize the existing |
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43 if (openal_ready() == AL_TRUE) { |
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44 fprintf(stderr,"(Bridge Info) - already initialized\n"); |
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45 instances_number++; |
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46 return AL_TRUE; |
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47 } |
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48 |
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49 cache_pointer = 0; |
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50 instances_number++; |
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51 |
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52 // initial memory size |
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53 cache_size = 50; |
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54 |
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55 // open hardware device if present |
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56 device = alcOpenDevice(NULL); |
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57 sources_number = 16; |
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58 if (device == NULL) { |
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59 fprintf(stderr,"(Bridge Warning) - failed to open sound device, using software renderer\n"); |
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60 device = alcOpenDevice("Generic Software"); |
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61 sources_number = 32; |
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62 if (device == NULL) { |
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63 fprintf(stderr,"(Bridge ERROR) - failed to start software renderer, sound will be disabled\n"); |
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64 return -1; |
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65 } |
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66 } |
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67 |
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68 fprintf(stderr,"(Bridge Info) - output device: %s\n", alcGetString(device, ALC_DEVICE_SPECIFIER)); |
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69 |
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70 context = alcCreateContext(device, NULL); |
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71 alcMakeContextCurrent(context); |
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72 alcProcessContext(context); |
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73 |
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74 if (AL_NO_ERROR != alGetError()) { |
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75 fprintf(stderr,"(Bridge ERROR) - Failed to create a new contex\n"); |
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76 alcMakeContextCurrent(NULL); |
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77 alcDestroyContext(context); |
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78 alcCloseDevice(device); |
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79 return -2; |
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80 } |
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81 |
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82 Sources = (ALuint *)Malloc (sizeof(ALuint) * sources_number); |
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83 alGenSources(sources_number, Sources); |
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84 |
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85 // set the listener gain, position (on xyz axes), velocity (one value for each axe) and orientation |
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86 // Position, Velocity and Orientation of the listener |
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87 ALfloat ListenerPos[] = {0.0, 0.0, 0.0}; |
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88 ALfloat ListenerVel[] = {0.0, 0.0, 0.0}; |
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89 ALfloat ListenerOri[] = {0.0, 0.0, -1.0, 0.0, 1.0, 0.0}; |
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90 |
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91 alListenerf (AL_GAIN, 1.0f ); |
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92 alListenerfv(AL_POSITION, ListenerPos); |
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93 alListenerfv(AL_VELOCITY, ListenerVel); |
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94 alListenerfv(AL_ORIENTATION, ListenerOri); |
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95 |
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96 if (AL_NO_ERROR != alGetError()) { |
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97 fprintf(stderr,"(Bridge ERROR) - Failed to set Listener properties\n"); |
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98 return -3; |
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99 } |
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100 |
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101 the_sounds = (al_sound_t *)Malloc (sizeof(al_sound_t) * cache_size); |
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102 for (i = 0; i < cache_size; i++) |
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103 the_sounds[i] = new_sound_el(); |
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104 |
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105 alGetError(); |
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106 return AL_TRUE; |
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107 } |
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108 |
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109 |
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110 // Stop all sounds, deallocate all memory and close OpenAL context |
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111 void openal_close (void) { |
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112 ALCcontext *context; |
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113 ALCdevice *device; |
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114 int i; |
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115 |
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116 if (instances_number == 0) { |
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117 fprintf(stderr,"(Bridge Warning) - OpenAL not initialized\n"); |
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118 return; |
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119 } |
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120 |
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121 instances_number--; |
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122 if (instances_number > 0) { |
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123 // release memory only when last session ends |
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124 return; |
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125 } |
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126 |
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127 for (i = 0; i < cache_size; i++) { |
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128 openal_unloadfile(i); |
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129 } |
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130 free(the_sounds); |
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131 |
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132 alSourceStopv (sources_number, Sources); |
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133 alDeleteSources (sources_number, Sources); |
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134 |
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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) { |
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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){ |
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160 ALenum format, error; |
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161 ALsizei bitsize, freq; |
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162 uint32_t fileformat; |
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163 al_sound_t sound_data; |
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164 int len, i, index = -1; |
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165 char *data; |
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166 FILE *fp; |
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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 } |
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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 } |
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182 // if we don't have memory available search for a free element |
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183 if (cache_pointer >= cache_size) |
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184 if (the_sounds[i].is_used == AL_FALSE) |
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185 index = i; |
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186 } |
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187 |
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188 if (index == -1 && cache_pointer >= cache_size) { |
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189 fprintf(stderr,"(Bridge Info) - No free spots found; doubling cache size\n", filename); |
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190 cache_size *= 2; |
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191 the_sounds = (al_sound_t *)Realloc (the_sounds, sizeof(al_sound_t) * cache_size); |
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192 for (i = cache_size - 50; i < cache_size; i++) |
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193 the_sounds[i] = new_sound_el(); |
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194 } else |
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195 index = ++cache_pointer; |
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196 |
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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; |
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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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227 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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243 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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271 the_sounds[index] = new_sound_el(); |
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272 } |
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273 } |
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