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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[
#define FADE_IN 1
#define STABLE 2
#define FADE_OUT 3
]]></code>
</global>
<plugin label="stepMuxer" id="1212" class="UtilityPlugin">
<name>Step Demuxer</name>
<p>Inputs up to 8 signals and switches between them on the output when the signal on the clock input goes high.</p>
<p>This plugin is untested, and may not work.</p>
<callback event="instantiate"><![CDATA[
sample_rate = s_rate;
ch_state = malloc(sizeof(int) * 8);
ch_gain = malloc(sizeof(float) * 8);
current_ch = 0;
last_clock = 0.0f;
]]></callback>
<callback event="activate"><![CDATA[
int i;
ch_state[0] = STABLE;
ch_gain[0] = 1.0f;
for (i = 1; i < 8; i++) {
ch_state[i] = STABLE;
ch_gain[i] = 0.0f;
}
current_ch = 0;
last_clock = 0.0f;
sample_rate = sample_rate;
]]></callback>
<callback event="cleanup"><![CDATA[
free(plugin_data->ch_state);
free(plugin_data->ch_gain);
]]></callback>
<callback event="run"><![CDATA[
unsigned long pos;
float fade_inc = 1.0f / (xfadet * sample_rate * 1000.0f);
float accum;
int ch;
for (pos = 0; pos < sample_count; pos++) {
// Calculate output value for this sample
accum = 0.0f;
accum += input0[pos] * ch_gain[0];
accum += input1[pos] * ch_gain[1];
accum += input2[pos] * ch_gain[2];
accum += input3[pos] * ch_gain[3];
accum += input4[pos] * ch_gain[4];
accum += input5[pos] * ch_gain[5];
accum += input6[pos] * ch_gain[6];
accum += input7[pos] * ch_gain[7];
buffer_write(output[pos], accum);
// Run crossfades
for (ch = 0; ch < 8; ch++) {
// Channel is still being faded in
if (ch_state[ch] == FADE_IN) {
ch_gain[ch] += fade_inc;
if (ch_gain[ch] >= 1.0f) {
ch_gain[ch] = 1.0f;
ch_state[ch] = STABLE;
}
// Channel is still being faded out
} else if (ch_state[ch] == FADE_OUT) {
ch_gain[ch] -= fade_inc;
if (ch_gain[ch] <= 0.0f) {
ch_gain[ch] = 0.0f;
ch_state[ch] = STABLE;
}
}
}
// Check for clock signal
if (last_clock <= 0.0f && clock[pos] > 0.0f) {
ch_state[current_ch] = FADE_OUT;
current_ch = (current_ch + 1) % 8;
ch_state[current_ch] = FADE_IN;
}
}
// Save state data
plugin_data->current_ch = current_ch;
plugin_data->last_clock = last_clock;
]]></callback>
<port label="xfadet" dir="input" type="control" hint="default_middle">
<name>Crossfade time (in ms)</name>
<range min="0" max="100"/>
</port>
<port label="clock" dir="input" type="audio">
<name>Clock</name>
</port>
<port label="input0" dir="input" type="audio">
<name>Input 1</name>
</port>
<port label="input1" dir="input" type="audio">
<name>Input 2</name>
</port>
<port label="input2" dir="input" type="audio">
<name>Input 3</name>
</port>
<port label="input3" dir="input" type="audio">
<name>Input 4</name>
</port>
<port label="input4" dir="input" type="audio">
<name>Input 5</name>
</port>
<port label="input5" dir="input" type="audio">
<name>Input 6</name>
</port>
<port label="input6" dir="input" type="audio">
<name>Input 7</name>
</port>
<port label="input7" dir="input" type="audio">
<name>Input 8</name>
</port>
<port label="output" dir="output" type="audio">
<name>Output</name>
</port>
<instance-data label="sample_rate" type="float"/>
<instance-data label="current_ch" type="int"/>
<instance-data label="last_clock" type="LADSPA_Data"/>
<instance-data label="ch_state" type="int *"/>
<instance-data label="ch_gain" type="float *"/>
</plugin>
</ladspa>
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