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* Copyright (C) 2001 Steve Harris
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include <jack/jack.h>
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jack_port_t *input_port;
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jack_port_t *output_port;
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unsigned int impulse_sent = 0;
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unsigned long response_duration;
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unsigned long response_pos;
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int grab_finished = 0;
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process (jack_nframes_t nframes, void *arg)
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jack_default_audio_sample_t *out = (jack_default_audio_sample_t *) jack_port_get_buffer (output_port, nframes);
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jack_default_audio_sample_t *in = (jack_default_audio_sample_t *) jack_port_get_buffer (input_port, nframes);
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} else if (impulse_sent) {
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for(i=0; i<nframes && response_pos < response_duration; i++) {
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response[response_pos++] = in[i];
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if (response_pos >= response_duration) {
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for (i=0; i<nframes; i++) {
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for (i=1; i<nframes; i++) {
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jack_shutdown (void *arg)
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main (int argc, char *argv[])
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jack_client_t *client;
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float fs; // The sample rate
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unsigned long peak_sample;
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float duration = 0.0f;
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unsigned int c_format = 0;
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int longopt_index = 0;
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extern int optind, opterr;
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char *optstring = "d:f";
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struct option long_options[] = {
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{ "help", 1, 0, 'h' },
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{ "duration", 1, 0, 'd' },
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{ "format", 1, 0, 'f' },
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while ((c = getopt_long (argc, argv, optstring, long_options, &longopt_index)) != -1) {
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// end of opts, but don't care
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duration = (float)atof(optarg);
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if (*optarg == 'c' || *optarg == 'C') {
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if (show_usage || duration <= 0.0f) {
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fprintf(stderr, "usage: jack_impulse_grab -d duration [-f (C|gnuplot)]\n");
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/* try to become a client of the JACK server */
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if ((client = jack_client_new("impulse_grabber")) == 0) {
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fprintf (stderr, "jack server not running?\n");
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/* tell the JACK server to call `process()' whenever
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there is work to be done.
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jack_set_process_callback (client, process, 0);
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/* tell the JACK server to call `jack_shutdown()' if
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it ever shuts down, either entirely, or if it
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just decides to stop calling us.
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jack_on_shutdown (client, jack_shutdown, 0);
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/* display the current sample rate. once the client is activated
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(see below), you should rely on your own sample rate
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callback (see above) for this value.
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fs = jack_get_sample_rate(client);
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response_duration = (unsigned long) (fs * duration);
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response = malloc(response_duration * sizeof(float));
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"Grabbing %f seconds (%lu samples) of impulse response\n",
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duration, response_duration);
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/* create two ports */
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input_port = jack_port_register (client, "input", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
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output_port = jack_port_register (client, "output", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
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/* tell the JACK server that we are ready to roll */
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if (jack_activate (client)) {
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fprintf (stderr, "cannot activate client");
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/* connect the ports. Note: you can't do this before
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the client is activated (this may change in the future).
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if ((ports = jack_get_ports (client, NULL, NULL, JackPortIsPhysical|JackPortIsOutput)) == NULL) {
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fprintf(stderr, "Cannot find any physical capture ports");
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if (jack_connect (client, ports[0], jack_port_name (input_port))) {
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fprintf (stderr, "cannot connect input ports\n");
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if ((ports = jack_get_ports (client, NULL, NULL, JackPortIsPhysical|JackPortIsInput)) == NULL) {
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fprintf(stderr, "Cannot find any physical playback ports");
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if (jack_connect (client, jack_port_name (output_port), ports[0])) {
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fprintf (stderr, "cannot connect output ports\n");
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/* Wait for grab to finish */
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while (!grab_finished) {
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jack_client_close (client);
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printf("impulse[%lu] = {", response_duration);
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for (i=0; i<response_duration; i++) {
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printf("\"%+1.10f\"", response[i]);
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if (i < response_duration - 1) {
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if (fabs(response[i]) > peak) {
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peak = fabs(response[i]);
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for (i=0; i<response_duration; i++) {
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printf("%1.12f\n", response[i]);
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if (fabs(response[i]) > peak) {
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peak = fabs(response[i]);
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fprintf(stderr, "Peak value was %f at sample %lu\n", peak, peak_sample);