3daudio.c

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