Added queue_timer.c by Chris Cannam <cannam@all-day-breakfast.com>

test/Makefile.am

@@ -1,6 +1,6 @@
 check_PROGRAMS=control pcm latency seq \
 	       playmidi1 timer rawmidi midiloop \
-	       omixer code oldapi
+	       omixer code oldapi queue_timer
 
 control_LDADD=../src/libasound.la
 pcm_LDADD=../src/libasound.la
@@ -12,6 +12,7 @@ rawmidi_LDADD=../src/libasound.la
 midiloop_LDADD=../src/libasound.la
 omixer_LDADD=../src/libasound.la
 oldapi_LDADD=../src/libasound.la
+queue_timer_LDADD=../src/libasound.la
 code_CFLAGS=-Wall -pipe -g -O2
 
 INCLUDES=-I$(top_srcdir)/include

test/queue_timer.c

@@ -0,0 +1,125 @@
+#include <unistd.h>
+#include <sys/time.h>
+#include <alsa/asoundlib.h>
+#include <alsa/seq.h>
+
+void normalize(struct timeval *tv)
+{
+    if (tv->tv_sec == 0) {
+	while (tv->tv_usec <= -1000000) { tv->tv_usec += 1000000; --tv->tv_sec; }
+	while (tv->tv_usec >=  1000000) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
+    } else if (tv->tv_sec < 0) {
+	while (tv->tv_usec <= -1000000) { tv->tv_usec += 1000000; --tv->tv_sec; }
+	while (tv->tv_usec > 0) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
+    } else { 
+	while (tv->tv_usec >= 1000000) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
+	while (tv->tv_usec < 0) { tv->tv_usec += 1000000; --tv->tv_sec; }
+    }
+}
+
+int
+main(int argc, char **argv)
+{
+    snd_seq_t *handle;
+    int portid;
+    int npfd;
+    struct pollfd *pfd;
+    int queue;
+    int i;
+    int rval;
+    struct timeval starttv, prevdiff;
+    int countdown = -1;
+    snd_seq_queue_timer_t *timer;
+    snd_timer_id_t *timerid;
+
+    if (snd_seq_open(&handle, "hw", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
+	fprintf(stderr, "failed to open ALSA sequencer interface\n");
+	return 1;
+    }
+
+    snd_seq_set_client_name(handle, "generator");
+
+    if ((portid = snd_seq_create_simple_port
+	 (handle, "generator",
+	  SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ, 0)) < 0) {
+	fprintf(stderr, "failed to create ALSA sequencer port\n");
+	return 1;
+    }
+
+    if ((queue = snd_seq_alloc_queue(handle)) < 0) {
+	fprintf(stderr, "failed to create ALSA sequencer queue\n");
+	return 1;
+    }
+/*
+    snd_seq_queue_timer_alloca(&timer);
+    snd_seq_get_queue_timer(handle, queue, timer);
+    snd_timer_id_alloca(&timerid);
+    snd_timer_id_set_class(timerid, SND_TIMER_CLASS_PCM);
+    snd_timer_id_set_sclass(timerid, SND_TIMER_SCLASS_NONE);
+    snd_timer_id_set_card(timerid, 0);
+    snd_timer_id_set_device(timerid, 0);
+    snd_timer_id_set_subdevice(timerid, 0);
+    snd_seq_queue_timer_set_id(timer, timerid);
+    snd_seq_set_queue_timer(handle, queue, timer);
+*/
+    snd_seq_start_queue(handle, queue, 0);
+    snd_seq_drain_output(handle);
+
+    gettimeofday(&starttv, 0);
+    prevdiff.tv_sec = 0;
+    prevdiff.tv_usec = 0;
+
+    while (countdown != 0) {
+
+	snd_seq_queue_status_t *status;
+	const snd_seq_real_time_t *rtime;
+	struct timeval tv, diff, diffdiff;
+
+	snd_seq_queue_status_alloca(&status);
+
+	snd_seq_get_queue_status(handle, queue, status);
+	rtime = snd_seq_queue_status_get_real_time(status);
+
+	gettimeofday(&tv, 0);
+
+	tv.tv_sec -= starttv.tv_sec;
+	tv.tv_usec -= starttv.tv_usec;
+	normalize(&tv);
+
+	diff.tv_sec = tv.tv_sec - rtime->tv_sec;
+	diff.tv_usec = tv.tv_usec - rtime->tv_nsec / 1000;
+	normalize(&diff);
+
+	diffdiff.tv_sec = diff.tv_sec - prevdiff.tv_sec;
+	diffdiff.tv_usec = diff.tv_usec - prevdiff.tv_usec;
+	normalize(&diffdiff);
+	prevdiff = diff;
+
+	fprintf(stderr, " real time: %12ld sec %8ld usec\nqueue time: %12ld sec %8ld usec\n      diff: %12ld sec %8ld usec\n  diffdiff: %12ld sec %8ld usec\n",
+		tv.tv_sec, tv.tv_usec,
+		rtime->tv_sec, rtime->tv_nsec / 1000,
+		diff.tv_sec, diff.tv_usec,
+		diffdiff.tv_sec, diffdiff.tv_usec);
+
+	if (diffdiff.tv_usec >  5000 ||
+	    diffdiff.tv_usec < -5000) {
+	    fprintf(stderr, "oops! queue slipped\n");
+	    if (tv.tv_sec < 5) {
+		fprintf(stderr, "(ignoring in first few seconds)\n");
+	    } else {
+		countdown = 2;
+	    }
+	} else {
+	    if (countdown > 0) --countdown;
+	}
+
+	fprintf(stderr, "\n");
+//	sleep(1);
+	struct timespec ts;
+	ts.tv_sec = 0;
+	ts.tv_nsec = 500000000;
+	nanosleep(&ts, 0);
+    }
+    return EXIT_SUCCESS;
+}
+