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bat: really skip analysis of the first period and update related comment

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Prior to this change bat/analyze.c would skip the last period of the recording, contrary to
what the comment in the code which stated the first period was meant to be skipped.

The comment has been updated to state that both the first and last period are skipped and the code
has been updated to match.

Closes: https://github.com/alsa-project/alsa-utils/pull/237
Signed-off-by: Delio Brignoli <dbrignoli@audioscience.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Delio Brignoli 2023-09-18 09:33:37 +01:00 committed by Jaroslav Kysela
parent 31e91f911e
commit 039e4cad48
1 changed files with 2 additions and 2 deletions
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4
bat/analyze.c
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@ -299,7 +299,7 @@ static int calculate_noise(struct bat *bat, float *src, int channel)
/* each section has 2 sine periods, the first one for locating
* and the second one for noise calculating */
int nsamples_per_section = nsamples * 2;
/* all sine periods will be calculated except the first one */
/* all sine periods will be calculated except the first and last one */
int nsection = bat->frames / nsamples - 1;
fprintf(bat->log, _("samples per period: %d\n"), nsamples);
@ -331,7 +331,7 @@ static int calculate_noise(struct bat *bat, float *src, int channel)
/* calculate average noise level */
sum_snr_pc = 0.0;
cnt_clean = cnt_noise = 0;
for (i = 0, offset = 0; i < nsection; i++) {
for (i = 1, offset = nsamples; i < nsection; i++) {
na.snr_db = SNR_DB_INVALID;
err = calculate_noise_one_period(bat, &na, src + offset,