examples/alreverb.c

   1 /*
   2  * OpenAL Reverb Example
   3  *
   4  * Copyright (c) 2012 by Chris Robinson <chris.kcat@gmail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /* This file contains an example for applying reverb to a sound. */
  26
  27 #include <stdio.h>
  28 #include <assert.h>
  29
  30 #include "AL/al.h"
  31 #include "AL/alc.h"
  32 #include "AL/alext.h"
  33 #include "AL/efx-presets.h"
  34
  35 #include "common/alhelpers.h"
  36 #include "common/sdl_sound.h"
  37
  38
  39 static LPALBUFFERSAMPLESSOFT alBufferSamplesSOFT = wrap_BufferSamples;
  40 static LPALISBUFFERFORMATSUPPORTEDSOFT alIsBufferFormatSupportedSOFT;
  41
  42 /* Effect object functions */
  43 static LPALGENEFFECTS alGenEffects;
  44 static LPALDELETEEFFECTS alDeleteEffects;
  45 static LPALISEFFECT alIsEffect;
  46 static LPALEFFECTI alEffecti;
  47 static LPALEFFECTIV alEffectiv;
  48 static LPALEFFECTF alEffectf;
  49 static LPALEFFECTFV alEffectfv;
  50 static LPALGETEFFECTI alGetEffecti;
  51 static LPALGETEFFECTIV alGetEffectiv;
  52 static LPALGETEFFECTF alGetEffectf;
  53 static LPALGETEFFECTFV alGetEffectfv;
  54
  55 /* Auxiliary Effect Slot object functions */
  56 static LPALGENAUXILIARYEFFECTSLOTS alGenAuxiliaryEffectSlots;
  57 static LPALDELETEAUXILIARYEFFECTSLOTS alDeleteAuxiliaryEffectSlots;
  58 static LPALISAUXILIARYEFFECTSLOT alIsAuxiliaryEffectSlot;
  59 static LPALAUXILIARYEFFECTSLOTI alAuxiliaryEffectSloti;
  60 static LPALAUXILIARYEFFECTSLOTIV alAuxiliaryEffectSlotiv;
  61 static LPALAUXILIARYEFFECTSLOTF alAuxiliaryEffectSlotf;
  62 static LPALAUXILIARYEFFECTSLOTFV alAuxiliaryEffectSlotfv;
  63 static LPALGETAUXILIARYEFFECTSLOTI alGetAuxiliaryEffectSloti;
  64 static LPALGETAUXILIARYEFFECTSLOTIV alGetAuxiliaryEffectSlotiv;
  65 static LPALGETAUXILIARYEFFECTSLOTF alGetAuxiliaryEffectSlotf;
  66 static LPALGETAUXILIARYEFFECTSLOTFV alGetAuxiliaryEffectSlotfv;
  67
  68
  69 /* LoadEffect loads the given reverb properties into a new OpenAL effect
  70  * object, and returns the new effect ID. */
  71 static ALuint LoadEffect(const EFXEAXREVERBPROPERTIES *reverb)
  72 {
  73     ALuint effect = 0;
  74     ALenum err;
  75
  76     /* Create the effect object and check if we can do EAX reverb. */
  77     alGenEffects(1, &effect);
  78     if(alGetEnumValue("AL_EFFECT_EAXREVERB") != 0)
  79     {
  80         printf("Using EAX Reverb\n");
  81
  82         /* EAX Reverb is available. Set the EAX effect type then load the
  83          * reverb properties. */
  84         alEffecti(effect, AL_EFFECT_TYPE, AL_EFFECT_EAXREVERB);
  85
  86         alEffectf(effect, AL_EAXREVERB_DENSITY, reverb->flDensity);
  87         alEffectf(effect, AL_EAXREVERB_DIFFUSION, reverb->flDiffusion);
  88         alEffectf(effect, AL_EAXREVERB_GAIN, reverb->flGain);
  89         alEffectf(effect, AL_EAXREVERB_GAINHF, reverb->flGainHF);
  90         alEffectf(effect, AL_EAXREVERB_GAINLF, reverb->flGainLF);
  91         alEffectf(effect, AL_EAXREVERB_DECAY_TIME, reverb->flDecayTime);
  92         alEffectf(effect, AL_EAXREVERB_DECAY_HFRATIO, reverb->flDecayHFRatio);
  93         alEffectf(effect, AL_EAXREVERB_DECAY_LFRATIO, reverb->flDecayLFRatio);
  94         alEffectf(effect, AL_EAXREVERB_REFLECTIONS_GAIN, reverb->flReflectionsGain);
  95         alEffectf(effect, AL_EAXREVERB_REFLECTIONS_DELAY, reverb->flReflectionsDelay);
  96         alEffectfv(effect, AL_EAXREVERB_REFLECTIONS_PAN, reverb->flReflectionsPan);
  97         alEffectf(effect, AL_EAXREVERB_LATE_REVERB_GAIN, reverb->flLateReverbGain);
  98         alEffectf(effect, AL_EAXREVERB_LATE_REVERB_DELAY, reverb->flLateReverbDelay);
  99         alEffectfv(effect, AL_EAXREVERB_LATE_REVERB_PAN, reverb->flLateReverbPan);
 100         alEffectf(effect, AL_EAXREVERB_ECHO_TIME, reverb->flEchoTime);
 101         alEffectf(effect, AL_EAXREVERB_ECHO_DEPTH, reverb->flEchoDepth);
 102         alEffectf(effect, AL_EAXREVERB_MODULATION_TIME, reverb->flModulationTime);
 103         alEffectf(effect, AL_EAXREVERB_MODULATION_DEPTH, reverb->flModulationDepth);
 104         alEffectf(effect, AL_EAXREVERB_AIR_ABSORPTION_GAINHF, reverb->flAirAbsorptionGainHF);
 105         alEffectf(effect, AL_EAXREVERB_HFREFERENCE, reverb->flHFReference);
 106         alEffectf(effect, AL_EAXREVERB_LFREFERENCE, reverb->flLFReference);
 107         alEffectf(effect, AL_EAXREVERB_ROOM_ROLLOFF_FACTOR, reverb->flRoomRolloffFactor);
 108         alEffecti(effect, AL_EAXREVERB_DECAY_HFLIMIT, reverb->iDecayHFLimit);
 109     }
 110     else
 111     {
 112         printf("Using Standard Reverb\n");
 113
 114         /* No EAX Reverb. Set the standard reverb effect type then load the
 115          * available reverb properties. */
 116         alEffecti(effect, AL_EFFECT_TYPE, AL_EFFECT_REVERB);
 117
 118         alEffectf(effect, AL_REVERB_DENSITY, reverb->flDensity);
 119         alEffectf(effect, AL_REVERB_DIFFUSION, reverb->flDiffusion);
 120         alEffectf(effect, AL_REVERB_GAIN, reverb->flGain);
 121         alEffectf(effect, AL_REVERB_GAINHF, reverb->flGainHF);
 122         alEffectf(effect, AL_REVERB_DECAY_TIME, reverb->flDecayTime);
 123         alEffectf(effect, AL_REVERB_DECAY_HFRATIO, reverb->flDecayHFRatio);
 124         alEffectf(effect, AL_REVERB_REFLECTIONS_GAIN, reverb->flReflectionsGain);
 125         alEffectf(effect, AL_REVERB_REFLECTIONS_DELAY, reverb->flReflectionsDelay);
 126         alEffectf(effect, AL_REVERB_LATE_REVERB_GAIN, reverb->flLateReverbGain);
 127         alEffectf(effect, AL_REVERB_LATE_REVERB_DELAY, reverb->flLateReverbDelay);
 128         alEffectf(effect, AL_REVERB_AIR_ABSORPTION_GAINHF, reverb->flAirAbsorptionGainHF);
 129         alEffectf(effect, AL_REVERB_ROOM_ROLLOFF_FACTOR, reverb->flRoomRolloffFactor);
 130         alEffecti(effect, AL_REVERB_DECAY_HFLIMIT, reverb->iDecayHFLimit);
 131     }
 132
 133     /* Check if an error occured, and clean up if so. */
 134     err = alGetError();
 135     if(err != AL_NO_ERROR)
 136     {
 137         fprintf(stderr, "OpenAL error: %s\n", alGetString(err));
 138         if(alIsEffect(effect))
 139             alDeleteEffects(1, &effect);
 140         return 0;
 141     }
 142
 143     return effect;
 144 }
 145
 146
 147 /* LoadBuffer loads the named audio file into an OpenAL buffer object, and
 148  * returns the new buffer ID. */
 149 static ALuint LoadSound(const char *filename)
 150 {
 151     ALenum err, format, type, channels;
 152     ALuint rate, buffer;
 153     size_t datalen;
 154     void *data;
 155     FilePtr sound;
 156
 157     /* Open the file and get the first stream from it */
 158     sound = openAudioFile(filename, 1000);
 159     if(!sound)
 160     {
 161         fprintf(stderr, "Could not open audio in %s\n", filename);
 162         return 0;
 163     }
 164
 165     /* Get the sound format, and figure out the OpenAL format */
 166     if(getAudioInfo(sound, &rate, &channels, &type) != 0)
 167     {
 168         fprintf(stderr, "Error getting audio info for %s\n", filename);
 169         closeAudioFile(sound);
 170         return 0;
 171     }
 172
 173     format = GetFormat(channels, type, alIsBufferFormatSupportedSOFT);
 174     if(format == AL_NONE)
 175     {
 176         fprintf(stderr, "Unsupported format (%s, %s) for %s\n",
 177                 ChannelsName(channels), TypeName(type), filename);
 178         closeAudioFile(sound);
 179         return 0;
 180     }
 181
 182     /* Decode the whole audio stream to a buffer. */
 183     data = decodeAudioStream(sound, &datalen);
 184     if(!data)
 185     {
 186         fprintf(stderr, "Failed to read audio from %s\n", filename);
 187         closeAudioFile(sound);
 188         return 0;
 189     }
 190
 191     /* Buffer the audio data into a new buffer object, then free the data and
 192      * close the file. */
 193     buffer = 0;
 194     alGenBuffers(1, &buffer);
 195     alBufferSamplesSOFT(buffer, rate, format, BytesToFrames(datalen, channels, type),
 196                         channels, type, data);
 197     free(data);
 198     closeAudioFile(sound);
 199
 200     /* Check if an error occured, and clean up if so. */
 201     err = alGetError();
 202     if(err != AL_NO_ERROR)
 203     {
 204         fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
 205         if(alIsBuffer(buffer))
 206             alDeleteBuffers(1, &buffer);
 207         return 0;
 208     }
 209
 210     return buffer;
 211 }
 212
 213
 214 int main(int argc, char **argv)
 215 {
 216     EFXEAXREVERBPROPERTIES reverb = EFX_REVERB_PRESET_GENERIC;
 217     ALuint source, buffer, effect, slot;
 218     ALenum state;
 219
 220     /* Print out usage if no file was specified */
 221     if(argc < 2)
 222     {
 223         fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
 224         return 1;
 225     }
 226
 227     /* Initialize OpenAL with the default device, and check for EFX support. */
 228     if(InitAL() != 0)
 229         return 1;
 230
 231     if(!alcIsExtensionPresent(alcGetContextsDevice(alcGetCurrentContext()), "ALC_EXT_EFX"))
 232     {
 233         fprintf(stderr, "Error: EFX not supported\n");
 234         CloseAL();
 235         return 1;
 236     }
 237
 238     /* Define a macro to help load the function pointers. */
 239 #define LOAD_PROC(x)  ((x) = alGetProcAddress(#x))
 240     LOAD_PROC(alGenEffects);
 241     LOAD_PROC(alDeleteEffects);
 242     LOAD_PROC(alIsEffect);
 243     LOAD_PROC(alEffecti);
 244     LOAD_PROC(alEffectiv);
 245     LOAD_PROC(alEffectf);
 246     LOAD_PROC(alEffectfv);
 247     LOAD_PROC(alGetEffecti);
 248     LOAD_PROC(alGetEffectiv);
 249     LOAD_PROC(alGetEffectf);
 250     LOAD_PROC(alGetEffectfv);
 251
 252     LOAD_PROC(alGenAuxiliaryEffectSlots);
 253     LOAD_PROC(alDeleteAuxiliaryEffectSlots);
 254     LOAD_PROC(alIsAuxiliaryEffectSlot);
 255     LOAD_PROC(alAuxiliaryEffectSloti);
 256     LOAD_PROC(alAuxiliaryEffectSlotiv);
 257     LOAD_PROC(alAuxiliaryEffectSlotf);
 258     LOAD_PROC(alAuxiliaryEffectSlotfv);
 259     LOAD_PROC(alGetAuxiliaryEffectSloti);
 260     LOAD_PROC(alGetAuxiliaryEffectSlotiv);
 261     LOAD_PROC(alGetAuxiliaryEffectSlotf);
 262     LOAD_PROC(alGetAuxiliaryEffectSlotfv);
 263
 264     if(alIsExtensionPresent("AL_SOFT_buffer_samples"))
 265     {
 266         LOAD_PROC(alBufferSamplesSOFT);
 267         LOAD_PROC(alIsBufferFormatSupportedSOFT);
 268     }
 269 #undef LOAD_PROC
 270
 271     /* Load the sound into a buffer. */
 272     buffer = LoadSound(argv[1]);
 273     if(!buffer)
 274     {
 275         CloseAL();
 276         return 1;
 277     }
 278
 279     /* Load the reverb into an effect. */
 280     effect = LoadEffect(&reverb);
 281     if(!effect)
 282     {
 283         alDeleteBuffers(1, &buffer);
 284         CloseAL();
 285         return 1;
 286     }
 287
 288     /* Create the effect slot object. This is what "plays" an effect on sources
 289      * that connect to it. */
 290     slot = 0;
 291     alGenAuxiliaryEffectSlots(1, &slot);
 292
 293     /* Tell the effect slot to use the loaded effect object. Note that the this
 294      * effectively copies the effect properties. You can modify or delete the
 295      * effect object afterward without affecting the effect slot.
 296      */
 297     alAuxiliaryEffectSloti(slot, AL_EFFECTSLOT_EFFECT, effect);
 298     assert(alGetError()==AL_NO_ERROR && "Failed to set effect slot");
 299
 300     /* Create the source to play the sound with. */
 301     source = 0;
 302     alGenSources(1, &source);
 303     alSourcei(source, AL_BUFFER, buffer);
 304
 305     /* Connect the source to the effect slot. This tells the source to use the
 306      * effect slot 'slot', on send #0 with the AL_FILTER_NULL filter object.
 307      */
 308     alSource3i(source, AL_AUXILIARY_SEND_FILTER, slot, 0, AL_FILTER_NULL);
 309     assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
 310
 311     /* Play the sound until it finishes. */
 312     alSourcePlay(source);
 313     do {
 314         Sleep(10);
 315         alGetSourcei(source, AL_SOURCE_STATE, &state);
 316     } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
 317
 318     /* All done. Delete resources, and close OpenAL. */
 319     alDeleteSources(1, &source);
 320     alDeleteAuxiliaryEffectSlots(1, &slot);
 321     alDeleteEffects(1, &effect);
 322     alDeleteBuffers(1, &buffer);
 323
 324     CloseAL();
 325
 326     return 0;
 327 }