3daudio.c

   1 #include <stdlib.h>
   2 #include <string.h>
   3 #ifndef _WIN32
   4 #include <AL/al.h>
   5 #include <AL/alc.h>
   6 #include <AL/alure.h>
   7 #else
   8 #include <alure.h>
   9 #include <al.h>
  10 #include <alc.h>
  11 #endif
  12 #include "bcl.h"
  13
  14 typedef struct {
  15 char * fileName;
  16 ALuint bufId;
  17 int count;
  18 } clip;
  19
  20 ALCdevice  *device;
  21 ALCcontext       *context;
  22 clip * clips;
  23 ALuint * sources;
  24 int clipsSize=20;
  25 int sourcesSize=20;
  26 int numClips;
  27 int numSources;
  28
  29 int addClip(clip c) {
  30 if (numClips>=clipsSize) {
  31 clips = realloc(clips,clipsSize*2*sizeof(clip));
  32 clipsSize*=2;
  33 }
  34 clips[numClips] = c;
  35 numClips++;
  36 return numClips-1;
  37 }
  38
  39 void removeClip(int pos) {
  40 free(clips[pos].fileName);
  41 for (;pos<numClips;pos++)
  42 clips[pos]=clips[pos+1];
  43 numClips--;
  44 if (numClips>0&&numClips <clipsSize/4) {
  45 clips = realloc(clips,clipsSize/4*sizeof(clip));
  46 clipsSize/=4;
  47 }
  48 }
  49
  50 int findClipstr(char * name) {
  51 int i = 0;
  52 for (;i<numClips;i++)
  53 if (strcmp(name,clips[i].fileName)==0)
  54 return i;
  55 return -1;
  56 }
  57
  58 int findClipi(int id) {
  59 int i = 0;
  60 for (;i<numClips;i++)
  61 if (clips[i].bufId==id)
  62 return i;
  63 return -1;
  64 }
  65
  66 int addSource(ALuint id) {
  67 if (numSources>=sourcesSize) {
  68 sources = realloc(sources,sizeof(ALuint)*sourcesSize*2);
  69 sourcesSize*=2;
  70 }
  71 sources[numSources]=id;
  72 numSources++;
  73 return numSources -1;
  74 }
  75
  76 void removeSource(int pos) {
  77 for (;pos<numSources;pos++)
  78 sources[pos]=sources[pos+1];
  79 if (numSources>0&&numSources<sourcesSize/4) {
  80 sources = realloc(sources,sizeof(ALuint)*sourcesSize/4);
  81 sourcesSize/=4;
  82 }
  83 }
  84
  85 int findSource(int id) {
  86 int i;
  87 for (i = 0; i < numSources;i++)
  88 if (sources[i]==id)
  89 return i;
  90 return -1;
  91 }
  92
  93 DECLSPEC void init3dAudio() {
  94 int attrlist[3];
  95 attrlist[0] = ALC_FREQUENCY;
  96 attrlist[1] = 44100;
  97 attrlist[2] = 0;
  98 device = alcOpenDevice(NULL);
  99 context = alcCreateContext(device, attrlist);
 100 alcMakeContextCurrent(context);
 101 numClips = 0;
 102 numSources = 0;
 103 clips = malloc(sizeof(clip)*clipsSize);
 104 sources = malloc(sizeof(ALuint)*sourcesSize);
 105 }
 106
 107 DECLSPEC void terminate3dAudio() {
 108 int i;
 109 alDeleteSources(numSources,sources);
 110 for (i = 0; i < numClips;i++) {
 111 free(clips[i].fileName);
 112 alDeleteBuffers(1,&clips[i].bufId);
 113 }
 114 free(clips);
 115 free(sources);
 116 alcDestroyContext(context);
 117 alcCloseDevice(device);
 118 }
 119
 120 DECLSPEC int load3dSound(char * file) {
 121 int pos = findClipstr(file);
 122 ALuint bufid;
 123 if (pos==-1) {
 124 /*
 125   ALsizei size;
 126   ALsizei bits;
 127   ALsizei freq;
 128   ALenum  format;
 129   ALvoid  *wave=0;
 130
 131   alGenBuffers(1,&bufid);
 132  alutLoadWAVFile((ALbyte*)file, &format, &wave, &size, &freq, 0);
 133     alBufferData(bufid,format,wave,size,freq);
 134     free(wave);
 135 */
 136 bufid = alureCreateBufferFromFile(file);
 137 clip c= {strdup(file),bufid,0};
 138 pos = addClip(c);
 139 }
 140 else
 141 bufid = clips[pos].bufId;
 142 ALuint soundid;
 143 alGenSources(1, &soundid);
 144 alSourcei(soundid, AL_BUFFER, bufid);
 145 addSource(soundid);
 146 clips[pos].count++;
 147 return soundid;
 148 }
 149
 150 DECLSPEC void unload3dSound(int sound) {
 151 int id,pos;
 152 alGetSourcei(sound,AL_BUFFER,&id);
 153 pos = findClipi(id);
 154 removeSource(sound);
 155 alDeleteSources(1, &sound);
 156 clips[pos].count--;
 157 if (clips[pos].count==0)
 158 removeClip(pos);
 159 }
 160
 161 DECLSPEC void set3dSoundPosition(int sound, float x, float y, float z) {
 162 alSource3f(sound,AL_POSITION,x,y,z);
 163 }
 164
 165 DECLSPEC void set3dSoundPitch(int sound, float pitch) {
 166 alSourcef(sound,AL_PITCH,pitch);
 167 }
 168
 169 DECLSPEC void play3dSound(int sound) {
 170 alSourcei(sound,AL_LOOPING,AL_FALSE);
 171 alSourcePlay(sound);
 172 }
 173
 174 DECLSPEC void loop3dSound(int sound) {
 175 alSourcei(sound,AL_LOOPING,AL_TRUE);
 176 alSourcePlay(sound);
 177 }
 178
 179 DECLSPEC void stop3dSound(int sound) {
 180 alSourceStop(sound);
 181 }