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tests: Adjust latency test calibration

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This makes the test more robust by:

1. Decreasing the '1' threshold during calibration - the RMS value for
   the sine wave will be 0.5, so the previous code was making us take
   the ALSA mixer past 0dB.

2. Using the difference rather than absolute value for 0->1 transitions,
   so that we're somewhat independent noise in our calculations.
This commit is contained in:
Arun Raghavan 2013-05-22 15:59:24 +05:30
parent 3f16c7100b
commit 36bdd720aa
1 changed files with 3 additions and 3 deletions
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6
src/tests/lo-latency-test.c
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@ -158,7 +158,7 @@ static void read_cb(pa_stream *s, size_t nbytes, void *userdata) {
* straddle the 0->1 transition, raising the average power. We keep the * straddle the 0->1 transition, raising the average power. We keep the
* definition of 1 tight in this case and detect the transition in the * definition of 1 tight in this case and detect the transition in the
* next round. */ * next round. */
if (last < 0.5f && cur > 0.8f) { if (cur - last > 0.4f) {
pa_gettimeofday(&tv_in); pa_gettimeofday(&tv_in);
fprintf(stderr, "Latency %llu\n", (unsigned long long) pa_timeval_diff(&tv_in, &tv_out)); fprintf(stderr, "Latency %llu\n", (unsigned long long) pa_timeval_diff(&tv_in, &tv_out));
} }
@ -234,8 +234,8 @@ static void calibrate_read_cb(pa_stream *s, size_t nbytes, void *userdata) {
switch (cal_state) { switch (cal_state) {
case CALIBRATION_ONE: case CALIBRATION_ONE:
/* Try to detect the sine wave */ /* Try to detect the sine wave. RMS is 0.5, */
if (rms(in, nsamp) < 0.8f) { if (rms(in, nsamp) < 0.40f) {
confirm = 0; confirm = 0;
v += 0.02f; v += 0.02f;