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 <assert.h>
  28 #include <inttypes.h>
  29 #include <limits.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32
  33 #include "sndfile.h"
  34
  35 #include "AL/al.h"
  36 #include "AL/alc.h"
  37 #include "AL/alext.h"
  38 #include "AL/efx.h"
  39 #include "AL/efx-presets.h"
  40
  41 #include "common/alhelpers.h"
  42
  43
  44 /* Effect object functions */
  45 static LPALGENEFFECTS alGenEffects;
  46 static LPALDELETEEFFECTS alDeleteEffects;
  47 static LPALISEFFECT alIsEffect;
  48 static LPALEFFECTI alEffecti;
  49 static LPALEFFECTIV alEffectiv;
  50 static LPALEFFECTF alEffectf;
  51 static LPALEFFECTFV alEffectfv;
  52 static LPALGETEFFECTI alGetEffecti;
  53 static LPALGETEFFECTIV alGetEffectiv;
  54 static LPALGETEFFECTF alGetEffectf;
  55 static LPALGETEFFECTFV alGetEffectfv;
  56
  57 /* Auxiliary Effect Slot object functions */
  58 static LPALGENAUXILIARYEFFECTSLOTS alGenAuxiliaryEffectSlots;
  59 static LPALDELETEAUXILIARYEFFECTSLOTS alDeleteAuxiliaryEffectSlots;
  60 static LPALISAUXILIARYEFFECTSLOT alIsAuxiliaryEffectSlot;
  61 static LPALAUXILIARYEFFECTSLOTI alAuxiliaryEffectSloti;
  62 static LPALAUXILIARYEFFECTSLOTIV alAuxiliaryEffectSlotiv;
  63 static LPALAUXILIARYEFFECTSLOTF alAuxiliaryEffectSlotf;
  64 static LPALAUXILIARYEFFECTSLOTFV alAuxiliaryEffectSlotfv;
  65 static LPALGETAUXILIARYEFFECTSLOTI alGetAuxiliaryEffectSloti;
  66 static LPALGETAUXILIARYEFFECTSLOTIV alGetAuxiliaryEffectSlotiv;
  67 static LPALGETAUXILIARYEFFECTSLOTF alGetAuxiliaryEffectSlotf;
  68 static LPALGETAUXILIARYEFFECTSLOTFV alGetAuxiliaryEffectSlotfv;
  69
  70
  71 /* LoadEffect loads the given reverb properties into a new OpenAL effect
  72  * object, and returns the new effect ID. */
  73 static ALuint LoadEffect(const EFXEAXREVERBPROPERTIES *reverb)
  74 {
  75     ALuint effect = 0;
  76     ALenum err;
  77
  78     /* Create the effect object and check if we can do EAX reverb. */
  79     alGenEffects(1, &effect);
  80     if(alGetEnumValue("AL_EFFECT_EAXREVERB") != 0)
  81     {
  82         printf("Using EAX Reverb\n");
  83
  84         /* EAX Reverb is available. Set the EAX effect type then load the
  85          * reverb properties. */
  86         alEffecti(effect, AL_EFFECT_TYPE, AL_EFFECT_EAXREVERB);
  87
  88         alEffectf(effect, AL_EAXREVERB_DENSITY, reverb->flDensity);
  89         alEffectf(effect, AL_EAXREVERB_DIFFUSION, reverb->flDiffusion);
  90         alEffectf(effect, AL_EAXREVERB_GAIN, reverb->flGain);
  91         alEffectf(effect, AL_EAXREVERB_GAINHF, reverb->flGainHF);
  92         alEffectf(effect, AL_EAXREVERB_GAINLF, reverb->flGainLF);
  93         alEffectf(effect, AL_EAXREVERB_DECAY_TIME, reverb->flDecayTime);
  94         alEffectf(effect, AL_EAXREVERB_DECAY_HFRATIO, reverb->flDecayHFRatio);
  95         alEffectf(effect, AL_EAXREVERB_DECAY_LFRATIO, reverb->flDecayLFRatio);
  96         alEffectf(effect, AL_EAXREVERB_REFLECTIONS_GAIN, reverb->flReflectionsGain);
  97         alEffectf(effect, AL_EAXREVERB_REFLECTIONS_DELAY, reverb->flReflectionsDelay);
  98         alEffectfv(effect, AL_EAXREVERB_REFLECTIONS_PAN, reverb->flReflectionsPan);
  99         alEffectf(effect, AL_EAXREVERB_LATE_REVERB_GAIN, reverb->flLateReverbGain);
 100         alEffectf(effect, AL_EAXREVERB_LATE_REVERB_DELAY, reverb->flLateReverbDelay);
 101         alEffectfv(effect, AL_EAXREVERB_LATE_REVERB_PAN, reverb->flLateReverbPan);
 102         alEffectf(effect, AL_EAXREVERB_ECHO_TIME, reverb->flEchoTime);
 103         alEffectf(effect, AL_EAXREVERB_ECHO_DEPTH, reverb->flEchoDepth);
 104         alEffectf(effect, AL_EAXREVERB_MODULATION_TIME, reverb->flModulationTime);
 105         alEffectf(effect, AL_EAXREVERB_MODULATION_DEPTH, reverb->flModulationDepth);
 106         alEffectf(effect, AL_EAXREVERB_AIR_ABSORPTION_GAINHF, reverb->flAirAbsorptionGainHF);
 107         alEffectf(effect, AL_EAXREVERB_HFREFERENCE, reverb->flHFReference);
 108         alEffectf(effect, AL_EAXREVERB_LFREFERENCE, reverb->flLFReference);
 109         alEffectf(effect, AL_EAXREVERB_ROOM_ROLLOFF_FACTOR, reverb->flRoomRolloffFactor);
 110         alEffecti(effect, AL_EAXREVERB_DECAY_HFLIMIT, reverb->iDecayHFLimit);
 111     }
 112     else
 113     {
 114         printf("Using Standard Reverb\n");
 115
 116         /* No EAX Reverb. Set the standard reverb effect type then load the
 117          * available reverb properties. */
 118         alEffecti(effect, AL_EFFECT_TYPE, AL_EFFECT_REVERB);
 119
 120         alEffectf(effect, AL_REVERB_DENSITY, reverb->flDensity);
 121         alEffectf(effect, AL_REVERB_DIFFUSION, reverb->flDiffusion);
 122         alEffectf(effect, AL_REVERB_GAIN, reverb->flGain);
 123         alEffectf(effect, AL_REVERB_GAINHF, reverb->flGainHF);
 124         alEffectf(effect, AL_REVERB_DECAY_TIME, reverb->flDecayTime);
 125         alEffectf(effect, AL_REVERB_DECAY_HFRATIO, reverb->flDecayHFRatio);
 126         alEffectf(effect, AL_REVERB_REFLECTIONS_GAIN, reverb->flReflectionsGain);
 127         alEffectf(effect, AL_REVERB_REFLECTIONS_DELAY, reverb->flReflectionsDelay);
 128         alEffectf(effect, AL_REVERB_LATE_REVERB_GAIN, reverb->flLateReverbGain);
 129         alEffectf(effect, AL_REVERB_LATE_REVERB_DELAY, reverb->flLateReverbDelay);
 130         alEffectf(effect, AL_REVERB_AIR_ABSORPTION_GAINHF, reverb->flAirAbsorptionGainHF);
 131         alEffectf(effect, AL_REVERB_ROOM_ROLLOFF_FACTOR, reverb->flRoomRolloffFactor);
 132         alEffecti(effect, AL_REVERB_DECAY_HFLIMIT, reverb->iDecayHFLimit);
 133     }
 134
 135     /* Check if an error occured, and clean up if so. */
 136     err = alGetError();
 137     if(err != AL_NO_ERROR)
 138     {
 139         fprintf(stderr, "OpenAL error: %s\n", alGetString(err));
 140         if(alIsEffect(effect))
 141             alDeleteEffects(1, &effect);
 142         return 0;
 143     }
 144
 145     return effect;
 146 }
 147
 148
 149 /* LoadBuffer loads the named audio file into an OpenAL buffer object, and
 150  * returns the new buffer ID.
 151  */
 152 static ALuint LoadSound(const char *filename)
 153 {
 154     ALenum err, format;
 155     ALuint buffer;
 156     SNDFILE *sndfile;
 157     SF_INFO sfinfo;
 158     short *membuf;
 159     sf_count_t num_frames;
 160     ALsizei num_bytes;
 161
 162     /* Open the audio file and check that it's usable. */
 163     sndfile = sf_open(filename, SFM_READ, &sfinfo);
 164     if(!sndfile)
 165     {
 166         fprintf(stderr, "Could not open audio in %s: %s\n", filename, sf_strerror(sndfile));
 167         return 0;
 168     }
 169     if(sfinfo.frames < 1 || sfinfo.frames > (sf_count_t)(INT_MAX/sizeof(short))/sfinfo.channels)
 170     {
 171         fprintf(stderr, "Bad sample count in %s (%" PRId64 ")\n", filename, sfinfo.frames);
 172         sf_close(sndfile);
 173         return 0;
 174     }
 175
 176     /* Get the sound format, and figure out the OpenAL format */
 177     format = AL_NONE;
 178     if(sfinfo.channels == 1)
 179         format = AL_FORMAT_MONO16;
 180     else if(sfinfo.channels == 2)
 181         format = AL_FORMAT_STEREO16;
 182     else if(sfinfo.channels == 3)
 183     {
 184         if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, NULL, 0) == SF_AMBISONIC_B_FORMAT)
 185             format = AL_FORMAT_BFORMAT2D_16;
 186     }
 187     else if(sfinfo.channels == 4)
 188     {
 189         if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, NULL, 0) == SF_AMBISONIC_B_FORMAT)
 190             format = AL_FORMAT_BFORMAT3D_16;
 191     }
 192     if(!format)
 193     {
 194         fprintf(stderr, "Unsupported channel count: %d\n", sfinfo.channels);
 195         sf_close(sndfile);
 196         return 0;
 197     }
 198
 199     /* Decode the whole audio file to a buffer. */
 200     membuf = malloc((size_t)(sfinfo.frames * sfinfo.channels) * sizeof(short));
 201
 202     num_frames = sf_readf_short(sndfile, membuf, sfinfo.frames);
 203     if(num_frames < 1)
 204     {
 205         free(membuf);
 206         sf_close(sndfile);
 207         fprintf(stderr, "Failed to read samples in %s (%" PRId64 ")\n", filename, num_frames);
 208         return 0;
 209     }
 210     num_bytes = (ALsizei)(num_frames * sfinfo.channels) * (ALsizei)sizeof(short);
 211
 212     /* Buffer the audio data into a new buffer object, then free the data and
 213      * close the file.
 214      */
 215     buffer = 0;
 216     alGenBuffers(1, &buffer);
 217     alBufferData(buffer, format, membuf, num_bytes, sfinfo.samplerate);
 218
 219     free(membuf);
 220     sf_close(sndfile);
 221
 222     /* Check if an error occured, and clean up if so. */
 223     err = alGetError();
 224     if(err != AL_NO_ERROR)
 225     {
 226         fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
 227         if(buffer && alIsBuffer(buffer))
 228             alDeleteBuffers(1, &buffer);
 229         return 0;
 230     }
 231
 232     return buffer;
 233 }
 234
 235
 236 int main(int argc, char **argv)
 237 {
 238     EFXEAXREVERBPROPERTIES reverb = EFX_REVERB_PRESET_GENERIC;
 239     ALuint source, buffer, effect, slot;
 240     ALenum state;
 241
 242     /* Print out usage if no arguments were specified */
 243     if(argc < 2)
 244     {
 245         fprintf(stderr, "Usage: %s [-device <name] <filename>\n", argv[0]);
 246         return 1;
 247     }
 248
 249     /* Initialize OpenAL, and check for EFX support. */
 250     argv++; argc--;
 251     if(InitAL(&argv, &argc) != 0)
 252         return 1;
 253
 254     if(!alcIsExtensionPresent(alcGetContextsDevice(alcGetCurrentContext()), "ALC_EXT_EFX"))
 255     {
 256         fprintf(stderr, "Error: EFX not supported\n");
 257         CloseAL();
 258         return 1;
 259     }
 260
 261     /* Define a macro to help load the function pointers. */
 262 #define LOAD_PROC(T, x)  ((x) = (T)alGetProcAddress(#x))
 263     LOAD_PROC(LPALGENEFFECTS, alGenEffects);
 264     LOAD_PROC(LPALDELETEEFFECTS, alDeleteEffects);
 265     LOAD_PROC(LPALISEFFECT, alIsEffect);
 266     LOAD_PROC(LPALEFFECTI, alEffecti);
 267     LOAD_PROC(LPALEFFECTIV, alEffectiv);
 268     LOAD_PROC(LPALEFFECTF, alEffectf);
 269     LOAD_PROC(LPALEFFECTFV, alEffectfv);
 270     LOAD_PROC(LPALGETEFFECTI, alGetEffecti);
 271     LOAD_PROC(LPALGETEFFECTIV, alGetEffectiv);
 272     LOAD_PROC(LPALGETEFFECTF, alGetEffectf);
 273     LOAD_PROC(LPALGETEFFECTFV, alGetEffectfv);
 274
 275     LOAD_PROC(LPALGENAUXILIARYEFFECTSLOTS, alGenAuxiliaryEffectSlots);
 276     LOAD_PROC(LPALDELETEAUXILIARYEFFECTSLOTS, alDeleteAuxiliaryEffectSlots);
 277     LOAD_PROC(LPALISAUXILIARYEFFECTSLOT, alIsAuxiliaryEffectSlot);
 278     LOAD_PROC(LPALAUXILIARYEFFECTSLOTI, alAuxiliaryEffectSloti);
 279     LOAD_PROC(LPALAUXILIARYEFFECTSLOTIV, alAuxiliaryEffectSlotiv);
 280     LOAD_PROC(LPALAUXILIARYEFFECTSLOTF, alAuxiliaryEffectSlotf);
 281     LOAD_PROC(LPALAUXILIARYEFFECTSLOTFV, alAuxiliaryEffectSlotfv);
 282     LOAD_PROC(LPALGETAUXILIARYEFFECTSLOTI, alGetAuxiliaryEffectSloti);
 283     LOAD_PROC(LPALGETAUXILIARYEFFECTSLOTIV, alGetAuxiliaryEffectSlotiv);
 284     LOAD_PROC(LPALGETAUXILIARYEFFECTSLOTF, alGetAuxiliaryEffectSlotf);
 285     LOAD_PROC(LPALGETAUXILIARYEFFECTSLOTFV, alGetAuxiliaryEffectSlotfv);
 286 #undef LOAD_PROC
 287
 288     /* Load the sound into a buffer. */
 289     buffer = LoadSound(argv[0]);
 290     if(!buffer)
 291     {
 292         CloseAL();
 293         return 1;
 294     }
 295
 296     /* Load the reverb into an effect. */
 297     effect = LoadEffect(&reverb);
 298     if(!effect)
 299     {
 300         alDeleteBuffers(1, &buffer);
 301         CloseAL();
 302         return 1;
 303     }
 304
 305     /* Create the effect slot object. This is what "plays" an effect on sources
 306      * that connect to it. */
 307     slot = 0;
 308     alGenAuxiliaryEffectSlots(1, &slot);
 309
 310     /* Tell the effect slot to use the loaded effect object. Note that the this
 311      * effectively copies the effect properties. You can modify or delete the
 312      * effect object afterward without affecting the effect slot.
 313      */
 314     alAuxiliaryEffectSloti(slot, AL_EFFECTSLOT_EFFECT, (ALint)effect);
 315     assert(alGetError()==AL_NO_ERROR && "Failed to set effect slot");
 316
 317     /* Create the source to play the sound with. */
 318     source = 0;
 319     alGenSources(1, &source);
 320     alSourcei(source, AL_BUFFER, (ALint)buffer);
 321
 322     /* Connect the source to the effect slot. This tells the source to use the
 323      * effect slot 'slot', on send #0 with the AL_FILTER_NULL filter object.
 324      */
 325     alSource3i(source, AL_AUXILIARY_SEND_FILTER, (ALint)slot, 0, AL_FILTER_NULL);
 326     assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
 327
 328     /* Play the sound until it finishes. */
 329     alSourcePlay(source);
 330     do {
 331         al_nssleep(10000000);
 332         alGetSourcei(source, AL_SOURCE_STATE, &state);
 333     } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
 334
 335     /* All done. Delete resources, and close down OpenAL. */
 336     alDeleteSources(1, &source);
 337     alDeleteAuxiliaryEffectSlots(1, &slot);
 338     alDeleteEffects(1, &effect);
 339     alDeleteBuffers(1, &buffer);
 340
 341     CloseAL();
 342
 343     return 0;
 344 }