test: latency - add -y option (I/O usleep)

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/test/latency.c b/test/latency.c
index 3aff37c1ae9193b50036b8ded7adc8076e9db83b..161d1f68d22e3acd2f67065548f49741f98eec3a 100644 (file)
--- a/test/latency.c
+++ b/test/latency.c
@@ -52,6 +52,7 @@ int latency_max = 2048;               /* in frames / 2 */
 int loop_sec = 30;             /* seconds */
 int block = 0;                 /* block mode */
 int use_poll = 0;
+int usleep_val = 0;
 int resample = 1;
 int sys_latency = 0;           /* data I/O: use system timings instead driver wakeups */
 int pos_dump = 0;              /* dump positions */
@@ -509,6 +510,8 @@ void help(void)
 "-s,--seconds   duration of test in seconds\n"
 "-b,--block     block mode\n"
 "-p,--poll      use poll (wait for event - reduces CPU usage)\n"
+"-y,--usleep    sleep for the specified amount of microseconds between\n"
+"               stream updates (default 0 - off)\n"
 "-e,--effect    apply an effect (bandpass filter sweep)\n"
 "-x,--posdump   dump buffer positions\n"
 "-X,--realtime  do a realtime check (buffering)\n"
@@ -548,6 +551,7 @@ int main(int argc, char *argv[])
                {"seconds", 1, NULL, 's'},
                {"block", 0, NULL, 'b'},
                {"poll", 0, NULL, 'p'},
+               {"usleep", 1, NULL, 'y'},
                {"effect", 0, NULL, 'e'},
                {"posdump", 0, NULL, 'x'},
                {"realtime", 0, NULL, 'X'},
@@ -565,7 +569,7 @@ int main(int argc, char *argv[])
        morehelp = 0;
        while (1) {
                int c;
-               if ((c = getopt_long(argc, argv, "hP:C:m:M:U:F:f:c:r:B:E:s:bpenxX", long_option, NULL)) < 0)
+               if ((c = getopt_long(argc, argv, "hP:C:m:M:U:F:f:c:r:B:E:s:y:bpenxX", long_option, NULL)) < 0)
                        break;
                switch (c) {
                case 'h':
@@ -624,6 +628,9 @@ int main(int argc, char *argv[])
                case 'p':
                        use_poll = 1;
                        break;
+               case 'y':
+                       usleep_val = atoi(optarg);
+                       break;
                case 'e':
                        effect = 1;
                        break;
@@ -671,6 +678,8 @@ int main(int argc, char *argv[])
                        loop_limit, latency_min * 2, latency_max * 2);
        if (sys_latency > 0)
                printf(", I/O updates %ims", sys_latency);
+       else if (!block)
+               printf(", I/O usleep %ius", usleep_val);
        printf("\n");
 
        if ((err = snd_pcm_open(&phandle, pdevice, SND_PCM_STREAM_PLAYBACK, block ? 0 : SND_PCM_NONBLOCK)) < 0) {
@@ -755,6 +764,8 @@ int main(int argc, char *argv[])
                        } else if (use_poll) {
                                /* use poll to wait for next event */
                                snd_pcm_wait(chandle, 1000);
+                       } else if (usleep_val > 0) {
+                               usleep(usleep_val);
                        }
                        if (pos_dump || realtime_check) {
                                if (sys_latency <= 0)