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Add an alconvolve option to silence the dry signal

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This commit is contained in:
Chris Robinson 2020-09-22 08:30:04 -07:00
parent d912b92a60
commit 844e6c881b
1 changed files with 49 additions and 3 deletions
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52
examples/alconvolve.c
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@ -45,6 +45,19 @@
#endif
/* Filter object functions */
static LPALGENFILTERS alGenFilters;
static LPALDELETEFILTERS alDeleteFilters;
static LPALISFILTER alIsFilter;
static LPALFILTERI alFilteri;
static LPALFILTERIV alFilteriv;
static LPALFILTERF alFilterf;
static LPALFILTERFV alFilterfv;
static LPALGETFILTERI alGetFilteri;
static LPALGETFILTERIV alGetFilteriv;
static LPALGETFILTERF alGetFilterf;
static LPALGETFILTERFV alGetFilterfv;
/* Effect object functions */
static LPALGENEFFECTS alGenEffects;
static LPALDELETEEFFECTS alDeleteEffects;
@ -372,15 +385,15 @@ static ALuint LoadSound(const char *filename)
int main(int argc, char **argv)
{
ALuint ir_buffer, effect, slot;
ALuint ir_buffer, filter, effect, slot;
StreamPlayer *player;
int i;
/* Print out usage if no arguments were specified */
if(argc < 2)
{
fprintf(stderr, "Usage: %s [-device <name>] <impulse response file> <filenames...>\n",
argv[0]);
fprintf(stderr, "Usage: %s [-device <name>] <impulse response file> "
"<[-dry | -nodry] filename>...\n", argv[0]);
return 1;
}
@ -404,6 +417,18 @@ int main(int argc, char **argv)
/* Define a macro to help load the function pointers. */
#define LOAD_PROC(T, x) ((x) = (T)alGetProcAddress(#x))
LOAD_PROC(LPALGENFILTERS, alGenFilters);
LOAD_PROC(LPALDELETEFILTERS, alDeleteFilters);
LOAD_PROC(LPALISFILTER, alIsFilter);
LOAD_PROC(LPALFILTERI, alFilteri);
LOAD_PROC(LPALFILTERIV, alFilteriv);
LOAD_PROC(LPALFILTERF, alFilterf);
LOAD_PROC(LPALFILTERFV, alFilterfv);
LOAD_PROC(LPALGETFILTERI, alGetFilteri);
LOAD_PROC(LPALGETFILTERIV, alGetFilteriv);
LOAD_PROC(LPALGETFILTERF, alGetFilterf);
LOAD_PROC(LPALGETFILTERFV, alGetFilterfv);
LOAD_PROC(LPALGENEFFECTS, alGenEffects);
LOAD_PROC(LPALDELETEEFFECTS, alDeleteEffects);
LOAD_PROC(LPALISEFFECT, alIsEffect);
@ -474,6 +499,12 @@ int main(int argc, char **argv)
alAuxiliaryEffectSloti(slot, AL_EFFECTSLOT_EFFECT, (ALint)effect);
assert(alGetError()==AL_NO_ERROR && "Failed to set effect slot");
/* Create a filter that can silence the dry path. */
filter = 0;
alGenFilters(1, &filter);
alFilteri(filter, AL_FILTER_TYPE, AL_FILTER_LOWPASS);
alFilterf(filter, AL_LOWPASS_GAIN, 0.0f);
player = NewPlayer();
/* Connect the player's source to the effect slot. */
alSource3i(player->source, AL_AUXILIARY_SEND_FILTER, (ALint)slot, 0, AL_FILTER_NULL);
@ -484,6 +515,20 @@ int main(int argc, char **argv)
{
const char *namepart;
if(argc-i > 1)
{
if(strcasecmp(argv[i], "-nodry") == 0)
{
alSourcei(player->source, AL_DIRECT_FILTER, (ALint)filter);
++i;
}
else if(strcasecmp(argv[i], "-dry") == 0)
{
alSourcei(player->source, AL_DIRECT_FILTER, AL_FILTER_NULL);
++i;
}
}
if(!OpenPlayerFile(player, argv[i]))
continue;
@ -518,6 +563,7 @@ int main(int argc, char **argv)
alDeleteAuxiliaryEffectSlots(1, &slot);
alDeleteEffects(1, &effect);
alDeleteFilters(1, &filter);
alDeleteBuffers(1, &ir_buffer);
CloseAL();