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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"/>
<code><![CDATA[
#include "ladspa-util.h"
#define BASE_BUFFER 8 // Tape length (inches)
]]></code>
</global>
<plugin label="tapeDelay" id="1211" class="DelayPlugin,SimulatorPlugin">
<name>Tape Delay Simulation</name>
<p>Correctly models the tape motion and some of the smear effect, there is no simulation for the head saturation yet, as I don't have a good model of it. When I get one I will add it.</p>
<p>The way the tape accelerates and decelerates gives a nicer delay effect for many purposes.</p>
<callback event="instantiate"><![CDATA[
unsigned int mbs = BASE_BUFFER * s_rate;
sample_rate = s_rate;
for (buffer_size = 4096; buffer_size < mbs;
buffer_size *= 2);
buffer = malloc(buffer_size * sizeof(LADSPA_Data));
buffer_mask = buffer_size - 1;
phase = 0;
last_phase = 0;
last_in = 0.0f;
last2_in = 0.0f;
last3_in = 0.0f;
z0 = 0.0f;
z1 = 0.0f;
z2 = 0.0f;
]]></callback>
<callback event="activate">
int i;
for (i = 0; i < buffer_size; i++) {
buffer[i] = 0;
}
phase = 0;
last_phase = 0;
last_in = 0.0f;
last2_in = 0.0f;
last3_in = 0.0f;
sample_rate = sample_rate;
z0 = 0.0f;
z1 = 0.0f;
z2 = 0.0f;
</callback>
<callback event="cleanup"><![CDATA[
free(plugin_data->buffer);
]]></callback>
<callback event="run"><![CDATA[
unsigned int pos;
float increment = f_clamp(speed, 0.0f, 40.0f);
float lin_int, lin_inc;
unsigned int track;
unsigned int fph;
LADSPA_Data out;
const float da = DB_CO(da_db);
const float t1a = DB_CO(t1a_db);
const float t2a = DB_CO(t2a_db);
const float t3a = DB_CO(t3a_db);
const float t4a = DB_CO(t4a_db);
const unsigned int t1d_s = f_round(t1d * sample_rate);
const unsigned int t2d_s = f_round(t2d * sample_rate);
const unsigned int t3d_s = f_round(t3d * sample_rate);
const unsigned int t4d_s = f_round(t4d * sample_rate);
for (pos = 0; pos < sample_count; pos++) {
fph = f_trunc(phase);
last_phase = fph;
lin_int = phase - (float)fph;
out = buffer[(unsigned int)(fph - t1d_s) & buffer_mask] * t1a;
out += buffer[(unsigned int)(fph - t2d_s) & buffer_mask] * t2a;
out += buffer[(unsigned int)(fph - t3d_s) & buffer_mask] * t3a;
out += buffer[(unsigned int)(fph - t4d_s) & buffer_mask] * t4a;
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_mask] =
cube_interp(lin_int, last3_in, last2_in, last_in, input[pos]);
}
last3_in = last2_in;
last2_in = last_in;
last_in = input[pos];
out += input[pos] * da;
buffer_write(output[pos], out);
if (phase >= buffer_size) {
phase -= buffer_size;
}
}
// Store current phase in instance
plugin_data->phase = phase;
plugin_data->last_phase = last_phase;
plugin_data->last_in = last_in;
plugin_data->last2_in = last2_in;
plugin_data->last3_in = last3_in;
plugin_data->z0 = z0;
plugin_data->z1 = z1;
plugin_data->z2 = z2;
]]></callback>
<port label="speed" dir="input" type="control" hint="default_1">
<name>Tape speed (inches/sec, 1=normal)</name>
<range min="0" max="10"/>
</port>
<port label="da_db" dir="input" type="control" hint="default_minimum">
<name>Dry level (dB)</name>
<range min="-90" max="0"/>
</port>
<port label="t1d" dir="input" type="control" hint="default_0">
<name>Tap 1 distance (inches)</name>
<range min="0" max="4"/>
</port>
<port label="t1a_db" dir="input" type="control" hint="default_0">
<name>Tap 1 level (dB)</name>
<range min="-90" max="0"/>
</port>
<port label="t2d" dir="input" type="control" hint="default_low">
<name>Tap 2 distance (inches)</name>
<range min="0" max="4"/>
</port>
<port label="t2a_db" dir="input" type="control" hint="default_minimum">
<name>Tap 2 level (dB)</name>
<range min="-90" max="0"/>
</port>
<port label="t3d" dir="input" type="control" hint="default_middle">
<name>Tap 3 distance (inches)</name>
<range min="0" max="4"/>
</port>
<port label="t3a_db" dir="input" type="control" hint="default_minimum">
<name>Tap 3 level (dB)</name>
<range min="-90" max="0"/>
</port>
<port label="t4d" dir="input" type="control" hint="default_high">
<name>Tap 4 distance (inches)</name>
<range min="0" max="4"/>
</port>
<port label="t4a_db" dir="input" type="control" hint="default_minimum">
<name>Tap 4 level (dB)</name>
<range min="-90" max="0"/>
</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="buffer_size" type="unsigned int"/>
<instance-data label="buffer_mask" type="unsigned int"/>
<instance-data label="phase" type="float"/>
<instance-data label="last_phase" type="unsigned int"/>
<instance-data label="last_in" type="LADSPA_Data"/>
<instance-data label="last2_in" type="LADSPA_Data"/>
<instance-data label="last3_in" type="LADSPA_Data"/>
<instance-data label="sample_rate" type="int"/>
<instance-data label="z0" type="LADSPA_Data"/>
<instance-data label="z1" type="LADSPA_Data"/>
<instance-data label="z2" type="LADSPA_Data"/>
</plugin>
</ladspa>
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