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imp_1199.xml
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imp_1199.xml
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<?xml version="1.0"?>
<!DOCTYPE ladspa SYSTEM "ladspa-swh.dtd">
<?xml-stylesheet href="ladspa.css" type="text/css"?>
<ladspa>
<global>
<meta name="maker" value="Steve Harris <[email protected]>"/>
<meta name="copyright" value="GPL"/>
<code><![CDATA[
#include <string.h>
#include "config.h"
#ifdef FFTW3
#include <fftw3.h>
typedef fftwf_plan fft_plan;
typedef float fftw_real;
#define local_malloc(s) fftwf_malloc(s)
#define local_free(s) fftwf_free(s)
#else
#ifdef EXPLICIT_S
#include <srfftw.h>
#else
#include <rfftw.h>
#endif //EXPLICIT_S
typedef rfftw_plan fft_plan;
#define local_malloc(s) malloc(s)
#define local_free(s) free(s)
#endif //FFTW3
#include "ladspa-util.h"
#define MAX_FFT_LENGTH 16384
#define SEG_LENGTH 128
#define IMP_LENGTH(a) (sizeof(a) / sizeof(float))
#define MK_IMP(i) impulse2freq(c, i, IMP_LENGTH(i), impulse_freq[c]); c++
static inline void impulse2freq(int id, float *imp, unsigned int length, fftw_real *out);
#include "impulses/all.h"
static fft_plan *g_plan_rc, *g_plan_cr;
static fftw_real *real_in, *real_out, *comp_in, *comp_out;
unsigned int fft_length[IMPULSES];
#ifdef __clang__
static void impulse2freq(int id, float *imp, unsigned int length, fftw_real *out)
#else
static inline void impulse2freq(int id, float *imp, unsigned int length, fftw_real *out)
#endif
{
fftw_real impulse_time[MAX_FFT_LENGTH];
#ifdef FFTW3
fft_plan tmp_plan;
#endif
unsigned int i, fftl = 128;
while (fftl < length+SEG_LENGTH) {
fftl *= 2;
}
fft_length[id] = fftl;
#ifdef FFTW3
g_plan_rc[id] = fftwf_plan_r2r_1d(fftl, real_in, comp_out, FFTW_R2HC, FFTW_MEASURE);
g_plan_cr[id] = fftwf_plan_r2r_1d(fftl, comp_in, real_out, FFTW_HC2R, FFTW_MEASURE);
tmp_plan = fftwf_plan_r2r_1d(fftl, impulse_time, out, FFTW_R2HC, FFTW_MEASURE);
#else
g_plan_rc[id] = rfftw_create_plan(fftl, FFTW_REAL_TO_COMPLEX, FFTW_ESTIMATE);
g_plan_cr[id] = rfftw_create_plan(fftl, FFTW_COMPLEX_TO_REAL, FFTW_ESTIMATE);
#endif
for (i=0; i<length; i++) {
impulse_time[i] = imp[i];
}
for (; i<fftl; i++) {
impulse_time[i] = 0.0f;
}
#ifdef FFTW3
fftwf_execute(tmp_plan);
fftwf_destroy_plan(tmp_plan);
#else
rfftw_one(g_plan_rc[id], impulse_time, out);
#endif
}
]]></code>
</global>
<plugin label="imp" id="1199" class="SpectralPlugin">
<name>Impulse convolver</name>
<p><![CDATA[
This is a convolver for a set of fairly short impulses.
The set of impulses has to be compiled in, they are:
\begin{tabular}{|r|l|}
\hline
Id & Impulse \\
\hline \hline
1 & Unit impulse (identity) \\
2 & My flat (light natural reverb) \\
3 & Yamaha Marshall stack simulator \\
4 & Fender 68 Vibrolux (SM57 on axis) \\
5 & Fender 68 Vibrolux (SM57 off axis) \\
6 & Fender 68 Vibrolux (Audio-technica AT4050) \\
7 & Fender 68 Vibrolux (Neumann U87) \\
8 & Fender Bassman (SM57 on axis) \\
9 & Fender Bassman (SM57 off axis) \\
10 & Fender Bassman (Audio-technica AT4050) \\
11 & Fender Bassman (Neumann U87) \\
12 & Fender Superchamp (SM57 on axis) \\
13 & Fender Superchamp (SM57 off axis) \\
14 & Fender Superchamp (Audio-technica AT4050) \\
15 & Fender Superchamp (Neumann U87) \\
16 & Marshall JCM2000 (SM57 on axis) \\
17 & Marshall JCM2000 (SM57 off axis) \\
18 & Marshall Plexi (SM57 on axis) \\
19 & Marshall Plexi (SM57 off axis) \\
20 & Matchless Chieftan (SM57 on axis) \\
21 & Matchless Chieftan (SM57 off axis) \\
\hline
\end{tabular}
The first three were quickly grabbed by me using jack_impulse_grabber, and the others we collected by someone else, but unfortunately I've lost his email address and can't find him on the web :(
]]></p>
<callback event="instantiate"><![CDATA[
unsigned int i;
impulse_freq = local_malloc(IMPULSES * sizeof(fftw_real *));
for (i=0; i<IMPULSES; i++) {
impulse_freq[i] = local_malloc(MAX_FFT_LENGTH * sizeof(fftw_real));
}
block_time = local_malloc(MAX_FFT_LENGTH * sizeof(fftw_real));
block_freq = local_malloc(MAX_FFT_LENGTH * sizeof(fftw_real));
op = local_malloc(MAX_FFT_LENGTH * sizeof(fftw_real));
overlap = local_malloc(MAX_FFT_LENGTH * sizeof(float));
opc = local_malloc(SEG_LENGTH * sizeof(LADSPA_Data));
plan_rc = local_malloc(IMPULSES * sizeof(fft_plan));
plan_cr = local_malloc(IMPULSES * sizeof(fft_plan));
/* transform the impulses */
g_plan_rc = plan_rc;
g_plan_cr = plan_cr;
real_in = block_time;
comp_out = block_freq;
comp_in = block_freq;
real_out = op;
mk_imps(impulse_freq);
in_ptr = 0;
out_ptr = 0;
count = 0;
]]></callback>
<callback event="activate"><![CDATA[
memset(block_time, 0, MAX_FFT_LENGTH * sizeof(fftw_real));
memset(block_freq, 0, MAX_FFT_LENGTH * sizeof(fftw_real));
memset(op, 0, MAX_FFT_LENGTH * sizeof(fftw_real));
memset(overlap, 0, (MAX_FFT_LENGTH - SEG_LENGTH) * sizeof(float));
memset(opc, 0, SEG_LENGTH * sizeof(LADSPA_Data));
in_ptr = 0;
out_ptr = 0;
count = 0;
]]></callback>
<callback event="cleanup"><![CDATA[
local_free(plugin_data->block_time);
local_free(plugin_data->block_freq);
local_free(plugin_data->op);
local_free(plugin_data->overlap);
local_free(plugin_data->opc);
unsigned int i;
for (i=0; i<IMPULSES; i++) {
local_free(plugin_data->impulse_freq[i]);
}
local_free(plugin_data->plan_cr);
local_free(plugin_data->plan_rc);
local_free(plugin_data->impulse_freq);
]]></callback>
<callback event="run"><![CDATA[
unsigned long i, pos, ipos, limit;
unsigned int im;
unsigned int len;
fftw_real tmp;
fftw_real *imp_freq;
float coef;
im = f_round(impulse) - 1;
if (im >= IMPULSES) {
im = 0;
}
coef = pow(10.0f, gain * 0.05f) / (float)fft_length[im];
imp_freq = impulse_freq[im];
for (pos = 0; pos < sample_count; pos += SEG_LENGTH) {
limit = pos + SEG_LENGTH;
for (ipos = pos; ipos < sample_count && ipos<limit; ipos++) {
block_time[in_ptr++] = input[ipos];
if (in_ptr == SEG_LENGTH) {
#ifdef FFTW3
fftwf_execute(plan_rc[im]);
#else
rfftw_one(plan_rc[im], block_time, block_freq);
#endif
len = fft_length[im];
for (i=1; i<fft_length[im]/2; i++) {
len--;
tmp = block_freq[i] * imp_freq[i] -
block_freq[len] * imp_freq[len];
block_freq[len] =
block_freq[i] * imp_freq[len] +
block_freq[len] * imp_freq[i];
block_freq[i] = tmp;
}
block_freq[0] = imp_freq[0] * block_freq[0];
block_freq[fft_length[im]/2] = imp_freq[fft_length[im]/2] * block_freq[fft_length[im]/2];
#ifdef FFTW3
fftwf_execute(plan_cr[im]);
#else
rfftw_one(plan_cr[im], block_freq, op);
#endif
for (i=0; i<fft_length[im]-SEG_LENGTH; i++) {
op[i] += overlap[i];
}
for (i=SEG_LENGTH; i<fft_length[im]; i++) {
overlap[i-SEG_LENGTH] = op[i];
}
in_ptr = 0;
if (count == 0 && high_lat < 1.0f) {
count = 1;
plugin_data->count = 1;
out_ptr = 0;
}
}
}
for (ipos = pos; ipos < sample_count && ipos<limit; ipos++) {
buffer_write(output[ipos], opc[out_ptr++] * coef);
if (out_ptr == SEG_LENGTH) {
for (i=0; i<SEG_LENGTH; i++) {
opc[i] = op[i];
}
out_ptr = 0;
}
}
}
plugin_data->in_ptr = in_ptr;
plugin_data->out_ptr = out_ptr;
*(plugin_data->latency) = SEG_LENGTH;
]]></callback>
<port label="impulse" dir="input" type="control" hint="integer,default_1">
<name>Impulse ID</name>
<p>Selects the impulse to convolve with. New impulses have to be compiled in.</p>
<range min="1" max="IMPULSES"/>
</port>
<port label="high_lat" dir="input" type="control" hint="integer,default_0">
<name>High latency mode</name>
<p>If you are running with blocks that are not whole powers of two long, or you are hearing distortion, try changing this to 1.</p>
<range min="0" max="1"/>
</port>
<port label="gain" dir="input" type="control" hint="default_0">
<name>Gain (dB)</name>
<p>Controls the gain of the output signal in dB's.</p>
<range min="-90" max="+24"/>
</port>
<port label="input" dir="input" type="audio">
<name>Input</name>
</port>
<port label="output" dir="output" type="audio">
<name>Output</name>
</port>
<port label="latency" dir="output" type="control">
<name>latency</name>
</port>
<instance-data label="impulse_freq" type="fftw_real **" />
<instance-data label="block_time" type="fftw_real *" />
<instance-data label="block_freq" type="fftw_real *" />
<instance-data label="op" type="fftw_real *" />
<instance-data label="opc" type="LADSPA_Data *" />
<instance-data label="overlap" type="LADSPA_Data *" />
<instance-data label="in_ptr" type="unsigned long" />
<instance-data label="out_ptr" type="unsigned long" />
<instance-data label="count" type="unsigned int" />
<instance-data label="plan_rc" type="fft_plan *" />
<instance-data label="plan_cr" type="fft_plan *" />
</plugin>
</ladspa>