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/*************************************************************************
* Implementation of the following:
*
* 1. Setup ECI to read audio from file, apply a 100Hz lowpass filter, and
* send it to the soundcard (/dev/dsp).
* 2. Every second, check the current position. If the stream has
* been running for over 15 seconds, exit immediately. Also,
* every second, increase the lowpass filter's cutoff frequency
* by 500Hz.
* 3. Stop the stream (if not already finished) and disconnect the
* chainsetup. Print chain operator status info.
************************************************************************/
#include <iostream>
#include <unistd.h>
#include <eca-control-interface.h>
/* compile with:
*
* c++ -o ecidoc_example ecidoc_example.cpp `libecasoundc-config --cflags --libs`
*/
int main(int argc, char *argv[])
{
double cutoff_inc = 500.0;
ECA_CONTROL_INTERFACE e;
e.command("cs-add play_chainsetup");
e.command("c-add 1st_chain");
e.command("ai-add foo.wav");
e.command("ao-add /dev/dsp");
e.command("cop-add -efl:100");
e.command("cop-select 1");
e.command("copp-select 1");
e.command("cs-connect");
e.command("start");
while(1) {
sleep(1);
e.command("engine-status");
if (e.last_string() != "running") break;
e.command("get-position");
double curpos = e.last_float();
if (curpos > 15.0) break;
e.command("copp-get");
double next_cutoff = cutoff_inc + e.last_float();
e.command_float_arg("copp-set", next_cutoff);
}
e.command("stop");
e.command("cs-disconnect");
e.command("cop-status");
std::cerr << "Chain operator status: " << e.last_string() << std::endl;
return(0);
}
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