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util/spkmodem-decode: split up auto_detect_tone

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-12 23:38:10 +00:00
parent f396654ae8
commit b59cc0f1ae
1 changed files with 44 additions and 27 deletions
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util/spkmodem_decode/spkmodem-decode.c
+44 -27
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@@ -220,7 +220,9 @@ static void collect_separator_tone(struct decoder_state *st);
static int valid_signal(struct decoder_state *st); static int valid_signal(struct decoder_state *st);
static void decode_pulse(struct decoder_state *st); static void decode_pulse(struct decoder_state *st);
static void auto_detect_tone(struct decoder_state *st); static void auto_detect_tone(struct decoder_state *st);
static int silent_signal(struct decoder_state *st);
static signed short read_sample(struct decoder_state *st); static signed short read_sample(struct decoder_state *st);
static void select_low_tone(struct decoder_state *st);
static int set_ascii_bit(struct decoder_state *st); static int set_ascii_bit(struct decoder_state *st);
static void print_char(struct decoder_state *st); static void print_char(struct decoder_state *st);
static void print_stats(struct decoder_state *st); static void print_stats(struct decoder_state *st);
@@ -458,38 +460,13 @@ decode_pulse(struct decoder_state *st)
static void static void
auto_detect_tone(struct decoder_state *st) auto_detect_tone(struct decoder_state *st)
{ {
int f;
if (st->learn_samples >= LEARN_SAMPLES) if (st->learn_samples >= LEARN_SAMPLES)
return; return;
/* if (silent_signal(st))
* Ignore silence / near silence.
* Both FIR windows will be near zero when no signal exists.
*/
if (st->freq_data <= 2 && st->freq_separator <= 2) {
st->learn_samples++;
return; return;
}
/* select_low_tone(st);
* Choose the lowest active tone.
* Separator frames carry tone in the separator window,
* data frames carry tone in the data window.
*/
f = st->freq_data;
if (f <= 0 || (st->freq_separator > 0 &&
st->freq_separator < f))
f = st->freq_separator;
if (f > 0) {
if (f < st->freq_min)
st->freq_min = f;
if (f > st->freq_max)
st->freq_max = f;
}
st->learn_samples++; st->learn_samples++;
@@ -503,6 +480,46 @@ auto_detect_tone(struct decoder_state *st)
} }
} }
/*
* Ignore silence / near silence.
* Both FIR windows will be near zero when no signal exists.
*/
static int
silent_signal(struct decoder_state *st)
{
if (st->freq_data > 2 || st->freq_separator > 2)
return 0;
st->learn_samples++;
return 1;
}
/*
* Choose the lowest active tone.
* Separator frames carry tone in the separator window,
* data frames carry tone in the data window.
*/
static void
select_low_tone(struct decoder_state *st)
{
int f;
f = st->freq_data;
if (f <= 0 || (st->freq_separator > 0 &&
st->freq_separator < f))
f = st->freq_separator;
if (f <= 0)
return;
if (f < st->freq_min)
st->freq_min = f;
if (f > st->freq_max)
st->freq_max = f;
}
static signed short static signed short
read_sample(struct decoder_state *st) read_sample(struct decoder_state *st)
{ {