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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 <steve@plugin.org.uk>"/>
<meta name="copyright" value="GPL"/>
<meta name="properties" value="HARD_RT_CAPABLE"/>
<code><![CDATA[
#include "ladspa-util.h"
#define BASE_BUFFER 0.001 // Base buffer length (s)
static inline LADSPA_Data sat(LADSPA_Data x, float q, float dist) {
if (x == q) {
return 1.0f / dist + q / (1.0f - f_exp(dist * q));
}
return ((x - q) / (1.0f - f_exp(-dist * (x - q))) + q /
(1.0f - f_exp(dist * q)));
}
]]></code>
</global>
<plugin label="retroFlange" id="1208" class="FlangerPlugin">
<name>Retro Flanger</name>
<p>A model of someone flanging the input.</p>
<p>Models the tape saturation effects, and frequency smear of a manual flanger. The results are a slightly distorted, but more subtle flanger sound that you get from a normal digital flanger.</p>
<callback event="instantiate"><![CDATA[
sample_rate = s_rate;
buffer_size = BASE_BUFFER * s_rate;
buffer = calloc(buffer_size, sizeof(LADSPA_Data));
phase = 0;
last_phase = 0;
last_in = 0.0f;
max_law_p = s_rate*2;
last_law_p = -1;
delay_line_length = sample_rate * 0.01f;
delay_line = calloc(sizeof(float), delay_line_length);
delay_pos = 0;
count = 0;
prev_law_peak = 0.0f;
next_law_peak = 1.0f;
prev_law_pos = 0;
next_law_pos = 10;
z0 = 0.0f;
z1 = 0.0f;
z2 = 0.0f;
]]></callback>
<callback event="activate"><![CDATA[
memset(delay_line, 0, sizeof(float) * delay_line_length);
memset(buffer, 0, sizeof(LADSPA_Data) * buffer_size);
z0 = 0.0f;
z1 = 0.0f;
z2 = 0.0f;
prev_law_peak = 0.0f;
next_law_peak = 1.0f;
prev_law_pos = 0;
next_law_pos = 10;
]]></callback>
<callback event="cleanup"><![CDATA[
free(plugin_data->delay_line);
free(plugin_data->buffer);
]]></callback>
<callback event="run"><![CDATA[
long int pos;
int law_p = f_trunc(LIMIT(sample_rate / f_clamp(law_freq, 0.0001f, 100.0f), 1, max_law_p));
float increment;
float lin_int, lin_inc;
int track;
int fph;
LADSPA_Data out = 0.0f;
const float dda_c = f_clamp(delay_depth_avg, 0.0f, 10.0f);
int dl_used = (dda_c * sample_rate) / 1000;
float inc_base = 1000.0f * (float)BASE_BUFFER;
const float delay_depth = 2.0f * dda_c;
float n_ph, p_ph, law;
for (pos = 0; pos < sample_count; pos++) {
// Write into the delay line
delay_line[delay_pos] = input[pos];
z0 = delay_line[MOD(delay_pos - dl_used, delay_line_length)] + 0.12919609397f*z1 - 0.31050847f*z2;
out = sat(z0*0.20466966f + z1*0.40933933f + z2*0.40933933f,
-0.23f, 3.3f);
z2 = z1; z1 = z0;
delay_pos = (delay_pos + 1) % delay_line_length;
if ((count++ % law_p) == 0) {
// Value for amplitude of law peak
next_law_peak = (float)rand() / (float)RAND_MAX;
next_law_pos = count + law_p;
} else if (count % law_p == law_p / 2) {
// Value for amplitude of law peak
prev_law_peak = (float)rand() / (float)RAND_MAX;
prev_law_pos = count + law_p;
}
n_ph = (float)(law_p - abs(next_law_pos - count))/(float)law_p;
p_ph = n_ph + 0.5f;
if (p_ph > 1.0f) {
p_ph -= 1.0f;
}
law = f_sin_sq(3.1415926f*p_ph)*prev_law_peak +
f_sin_sq(3.1415926f*n_ph)*next_law_peak;
increment = inc_base / (delay_depth * law + 0.2);
fph = f_trunc(phase);
last_phase = fph;
lin_int = phase - (float)fph;
out += LIN_INTERP(lin_int, buffer[(fph+1) % buffer_size],
buffer[(fph+2) % buffer_size]);
phase += increment;
lin_inc = 1.0f / (floor(phase) - last_phase + 1);
lin_inc = lin_inc > 1.0f ? 1.0f : lin_inc;
lin_int = 0.0f;
for (track = last_phase; track < phase; track++) {
lin_int += lin_inc;
buffer[track % buffer_size] =
LIN_INTERP(lin_int, last_in, input[pos]);
}
last_in = input[pos];
buffer_write(output[pos], out * 0.707f);
if (phase >= buffer_size) {
phase -= buffer_size;
}
}
// Store current phase in instance
plugin_data->phase = phase;
plugin_data->prev_law_peak = prev_law_peak;
plugin_data->next_law_peak = next_law_peak;
plugin_data->prev_law_pos = prev_law_pos;
plugin_data->next_law_pos = next_law_pos;
plugin_data->last_phase = last_phase;
plugin_data->last_in = last_in;
plugin_data->count = count;
plugin_data->last_law_p = last_law_p;
plugin_data->delay_pos = delay_pos;
plugin_data->z0 = z0;
plugin_data->z1 = z1;
plugin_data->z2 = z2;
]]></callback>
<port label="delay_depth_avg" dir="input" type="control" hint="default_low">
<name>Average stall (ms)</name>
<range min="0" max="10"/>
<p>The average time difference between the two tapes, per stall</p>
</port>
<port label="law_freq" dir="input" type="control" hint="default_1">
<name>Flange frequency (Hz)</name>
<range min="0.5" max="8"/>
<p>The rate the tape is stalled at.</p>
</port>
<port label="input" dir="input" type="audio">
<name>Input</name>
</port>
<port label="output" dir="output" type="audio">
<name>Output</name>
</port>
<instance-data label="buffer" type="LADSPA_Data *"/>
<instance-data label="phase" type="float"/>
<instance-data label="last_phase" type="int"/>
<instance-data label="last_in" type="LADSPA_Data"/>
<instance-data label="buffer_size" type="long"/>
<instance-data label="sample_rate" type="long"/>
<instance-data label="count" type="long"/>
<instance-data label="max_law_p" type="int"/>
<instance-data label="last_law_p" type="int"/>
<instance-data label="delay_pos" type="int"/>
<instance-data label="delay_line_length" type="int"/>
<instance-data label="delay_line" type="LADSPA_Data *"/>
<instance-data label="z0" type="LADSPA_Data"/>
<instance-data label="z1" type="LADSPA_Data"/>
<instance-data label="z2" type="LADSPA_Data"/>
<instance-data label="prev_law_peak" type="float"/>
<instance-data label="next_law_peak" type="float"/>
<instance-data label="prev_law_pos" type="int"/>
<instance-data label="next_law_pos" type="int"/>
</plugin>
</ladspa>
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