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(libretro-common) Backport reverb.c changes

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This commit is contained in:
libretroadmin 2023-02-20 14:40:10 +01:00
parent a6bb8679c9
commit 22cdfaf95a
1 changed files with 62 additions and 62 deletions
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124
libretro-common/audio/dsp_filters/reverb.c
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@ -50,7 +50,6 @@ static INLINE float comb_process(struct comb *c, float input)
{
float output = c->buffer[c->bufidx];
c->filterstore = (output * c->damp2) + (c->filterstore * c->damp1);
c->buffer[c->bufidx] = input + (c->filterstore * c->feedback);
c->bufidx++;
@ -64,7 +63,7 @@ static INLINE float allpass_process(struct allpass *a, float input)
{
float bufout = a->buffer[a->bufidx];
float output = -input + bufout;
a->buffer[a->bufidx] = input + bufout * a->feedback;
a->buffer[a->bufidx] = input + bufout * a->feedback;
a->bufidx++;
if (a->bufidx >= a->bufsize)
@ -73,30 +72,31 @@ static INLINE float allpass_process(struct allpass *a, float input)
return output;
}
#define numcombs 8
#define numallpasses 4
static const float muted = 0;
static const float fixedgain = 0.015f;
static const float scalewet = 3;
static const float scaledry = 2;
static const float scaledamp = 0.4f;
static const float scaleroom = 0.28f;
static const float offsetroom = 0.7f;
static const float initialroom = 0.5f;
static const float initialdamp = 0.5f;
static const float initialwet = 1.0f / 3.0f;
static const float initialdry = 0;
static const float initialwidth = 1;
static const float initialmode = 0;
static const float freezemode = 0.5f;
#define NUMCOMBS 8
#define NUMALLPASSES 4
static const float muted = 0.0f;
static const float fixedgain = 0.015f;
static const float scalewet = 3.0f;
static const float scaledry = 2.0f;
static const float scaledamp = 0.4f;
static const float scaleroom = 0.28f;
static const float offsetroom = 0.7f;
static const float initialroom = 0.5f;
static const float initialdamp = 0.5f;
static const float initialwet = 1.0f / 3.0f;
static const float initialdry = 0.0f;
static const float initialwidth = 1.0f;
static const float initialmode = 0.0f;
static const float freezemode = 0.5f;
struct revmodel
{
struct comb combL[numcombs];
struct allpass allpassL[numallpasses];
struct comb combL[NUMCOMBS];
struct allpass allpassL[NUMALLPASSES];
float *bufcomb[numcombs];
float *bufallpass[numallpasses];
float *bufcomb[NUMCOMBS];
float *bufallpass[NUMALLPASSES];
float gain;
float roomsize, roomsize1;
@ -114,10 +114,10 @@ static float revmodel_process(struct revmodel *rev, float in)
float mono_in = in;
float input = mono_in * rev->gain;
for (i = 0; i < numcombs; i++)
for (i = 0; i < NUMCOMBS; i++)
mono_out += comb_process(&rev->combL[i], input);
for (i = 0; i < numallpasses; i++)
for (i = 0; i < NUMALLPASSES; i++)
mono_out = allpass_process(&rev->allpassL[i], mono_out);
return mono_in * rev->dry + mono_out * rev->wet1;
@ -131,8 +131,8 @@ static void revmodel_update(struct revmodel *rev)
if (rev->mode >= freezemode)
{
rev->roomsize1 = 1.0f;
rev->damp1 = 0.0f;
rev->gain = muted;
rev->damp1 = 0.0f;
rev->gain = muted;
}
else
{
@ -141,7 +141,7 @@ static void revmodel_update(struct revmodel *rev)
rev->gain = fixedgain;
}
for (i = 0; i < numcombs; i++)
for (i = 0; i < NUMCOMBS; i++)
{
rev->combL[i].feedback = rev->roomsize1;
rev->combL[i].damp1 = rev->damp1;
@ -185,30 +185,30 @@ static void revmodel_setmode(struct revmodel *rev, float value)
revmodel_update(rev);
}
static void revmodel_init(struct revmodel *rev,int srate)
static void revmodel_init(struct revmodel *rev,int srate,bool right)
{
unsigned c;
static const int comb_lengths[8] = { 1116, 1188, 1277, 1356, 1422, 1491, 1557, 1617 };
static const int allpass_lengths[4] = { 225, 341, 441, 556 };
double r = srate * (1 / 44100.0);
int stereosep = right ? 23 : 0;
static const int comb_lengths[8] = { 1116,1188,1277,1356,1422,1491,1557,1617 };
static const int allpass_lengths[4] = { 225,341,441,556 };
double r = srate * (1 / 44100.0);
unsigned c;
for (c = 0; c < numcombs; ++c)
for (c = 0; c < NUMCOMBS; ++c)
{
rev->bufcomb[c] = malloc(r*comb_lengths[c]*sizeof(float));
rev->combL[c].buffer = rev->bufcomb[c];
memset(rev->combL[c].buffer,0,r*comb_lengths[c]*sizeof(float));
rev->combL[c].bufsize=r*comb_lengths[c];
}
rev->bufcomb[c] = malloc(r*comb_lengths[c]+stereosep*sizeof(float));
rev->combL[c].buffer = rev->bufcomb[c];
memset(rev->combL[c].buffer,0,r*comb_lengths[c]+stereosep*sizeof(float));
rev->combL[c].bufsize=r*comb_lengths[c]+stereosep;
}
for (c = 0; c < numallpasses; ++c)
for (c = 0; c < NUMALLPASSES; ++c)
{
rev->bufallpass[c] = malloc(r*allpass_lengths[c]*sizeof(float));
rev->allpassL[c].buffer = rev->bufallpass[c];
memset(rev->allpassL[c].buffer,0,r*allpass_lengths[c]*sizeof(float));
rev->allpassL[c].bufsize=r*allpass_lengths[c];
rev->allpassL[c].feedback = 0.5f;
}
rev->bufallpass[c] = malloc(r*allpass_lengths[c]+stereosep*sizeof(float));
rev->allpassL[c].buffer = rev->bufallpass[c];
memset(rev->allpassL[c].buffer,0,r*allpass_lengths[c]+stereosep*sizeof(float));
rev->allpassL[c].bufsize=r*allpass_lengths[c]+stereosep;
rev->allpassL[c].feedback = 0.5f;
}
revmodel_setwet(rev, initialwet);
revmodel_setroomsize(rev, initialroom);
@ -228,14 +228,16 @@ static void reverb_free(void *data)
struct reverb_data *rev = (struct reverb_data*)data;
unsigned i;
for (i = 0; i < numcombs; i++) {
free(rev->left.bufcomb[i]);
free(rev->right.bufcomb[i]);
for (i = 0; i < NUMCOMBS; i++)
{
free(rev->left.bufcomb[i]);
free(rev->right.bufcomb[i]);
}
for (i = 0; i < numallpasses; i++) {
free(rev->left.bufallpass[i]);
free(rev->right.bufallpass[i]);
for (i = 0; i < NUMALLPASSES; i++)
{
free(rev->left.bufallpass[i]);
free(rev->right.bufallpass[i]);
}
free(data);
}
@ -254,9 +256,8 @@ static void reverb_process(void *data, struct dspfilter_output *output,
for (i = 0; i < input->frames; i++, out += 2)
{
float in[2] = { out[0], out[1] };
out[0] = revmodel_process(&rev->left, in[0]);
out[1] = revmodel_process(&rev->right, in[1]);
out[0] = revmodel_process(&rev->left, in[0]);
out[1] = revmodel_process(&rev->right, in[1]);
}
}
@ -269,14 +270,14 @@ static void *reverb_init(const struct dspfilter_info *info,
if (!rev)
return NULL;
config->get_float(userdata, "drytime", &drytime, 0.43f);
config->get_float(userdata, "wettime", &wettime, 0.4f);
config->get_float(userdata, "damping", &damping, 0.8f);
config->get_float(userdata, "drytime", &drytime, 0.43f);
config->get_float(userdata, "wettime", &wettime, 0.4f);
config->get_float(userdata, "damping", &damping, 0.8f);
config->get_float(userdata, "roomwidth", &roomwidth, 0.56f);
config->get_float(userdata, "roomsize", &roomsize, 0.56f);
config->get_float(userdata, "roomsize", &roomsize, 0.56f);
revmodel_init(&rev->left,info->input_rate);
revmodel_init(&rev->right,info->input_rate);
revmodel_init(&rev->left,info->input_rate,false);
revmodel_init(&rev->right,info->input_rate,true);
revmodel_setdamp(&rev->left, damping);
revmodel_setdry(&rev->left, drytime);
@ -309,7 +310,6 @@ static const struct dspfilter_implementation reverb_plug = {
const struct dspfilter_implementation *dspfilter_get_implementation(dspfilter_simd_mask_t mask)
{
(void)mask;
return &reverb_plug;
}