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