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Spectrum analyser: add some useful comments

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Přemysl Eric Janouch 2021-07-09 06:25:48 +02:00
parent 20c8385f2e
commit 2d641d087f
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 4 additions and 0 deletions
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nncmpp.c
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@ -569,6 +569,9 @@ item_list_resize (struct item_list *self, size_t len)
// --- Spectrum analyzer ------------------------------------------------------- // --- Spectrum analyzer -------------------------------------------------------
// See http://www.zytrax.com/tech/audio/equalization.html
// for a good write-up about this problem domain
#ifdef WITH_FFTW #ifdef WITH_FFTW
struct spectrum struct spectrum
@ -809,6 +812,7 @@ spectrum_init (struct spectrum *s, char *format, int bars, struct error **e)
if (s->samples < 1) if (s->samples < 1)
s->samples = 1; s->samples = 1;
// XXX: we average the channels but might want to average the DFT results
if (s->bits == 8) s->decode = spectrum_decode_8; if (s->bits == 8) s->decode = spectrum_decode_8;
if (s->bits == 16) s->decode = spectrum_decode_16; if (s->bits == 16) s->decode = spectrum_decode_16;