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util/spkmodem-decode: split up handle_audio()

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this enables the separated code to have reduced
indentation

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-12 23:07:28 +00:00
parent e8d46de0e1
commit a81dde3d08
1 changed files with 40 additions and 27 deletions
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util/spkmodem_decode/spkmodem-decode.c
+40 -27
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@@ -216,6 +216,7 @@ static const char *argv0;
static int host_is_big_endian(void);
static void handle_audio(struct decoder_state *st);
static void collect_separator_tone(struct decoder_state *st);
static int valid_signal(struct decoder_state *st);
static void decode_pulse(struct decoder_state *st);
static void auto_detect_tone(struct decoder_state *st);
@@ -296,7 +297,6 @@ host_is_big_endian(void)
static void
handle_audio(struct decoder_state *st)
{
int avg;
int sample;
/*
@@ -306,32 +306,7 @@ handle_audio(struct decoder_state *st)
if (st->sample_count >= (3 * SAMPLES_PER_FRAME))
reset_char(st);
if (!valid_signal(st)) {
/*
* collect separator tone statistics
* (and auto-adjust tolerances)
*/
if (st->sep_samples < 50 && st->freq_separator > 0) {
st->sep_sum += st->freq_separator;
st->sep_samples++;
if (st->sep_samples == 50) {
avg = st->sep_sum / st->sep_samples;
/* plus or minus 3 pulse window */
st->sep_min = avg - SEP_TOLERANCE_PULSES;
st->sep_max = avg + SEP_TOLERANCE_PULSES;
if (st->debug)
printf("separator calibrated: %dHz\n",
avg * FRAME_RATE);
}
}
decode_pulse(st);
return;
}
collect_separator_tone(st);
if (set_ascii_bit(st) < 0)
print_char(st);
@@ -341,6 +316,44 @@ handle_audio(struct decoder_state *st)
decode_pulse(st);
}
/*
* collect separator tone statistics
* (and auto-adjust tolerances)
*/
static void
collect_separator_tone(struct decoder_state *st)
{
int avg;
if (valid_signal(st))
return;
if (st->sep_samples >= 50 && st->freq_separator <= 0) {
decode_pulse(st);
return;
}
st->sep_sum += st->freq_separator;
st->sep_samples++;
if (st->sep_samples != 50) {
decode_pulse(st);
return;
}
avg = st->sep_sum / st->sep_samples;
/* plus or minus pulse window */
st->sep_min = avg - SEP_TOLERANCE_PULSES;
st->sep_max = avg + SEP_TOLERANCE_PULSES;
if (st->debug)
printf("separator calibrated: %dHz\n",
avg * FRAME_RATE);
decode_pulse(st);
}
/*
* Verify that the observed pulse densities fall within the
* expected ranges for spkmodem tones. This prevents random noise