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util/spkmodem-recv: rename variables for clarity 

Signed-off-by: Leah Rowe <leah@libreboot.org>
fsdg20230625
Leah Rowe 2023-06-05 00:34:44 +01:00
parent f7fccb5963
commit af36cc7f93
1 changed files with 19 additions and 17 deletions
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36
util/spkmodem_recv/spkmodem-recv.c
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@ -24,7 +24,7 @@
#define ERR() (errno = errno ? errno : ECANCELED) #define ERR() (errno = errno ? errno : ECANCELED)
signed short frame[2 * SAMPLES_PER_FRAME], pulse[2 * SAMPLES_PER_FRAME]; signed short frame[2 * SAMPLES_PER_FRAME], pulse[2 * SAMPLES_PER_FRAME];
int f1, f2, lp, ascii_bit = 7; int freq_data, freq_separator, sample_count, ascii_bit = 7;
char ascii = 0; char ascii = 0;
void handle_audio(void); void handle_audio(void);
@ -56,24 +56,24 @@ main(int argc, char *argv[])
void void
handle_audio(void) handle_audio(void)
{ {
static int llp = 0; static int flush_count = 0;
if (lp > (3 * SAMPLES_PER_FRAME)) { if (sample_count > (3 * SAMPLES_PER_FRAME)) {
ascii_bit = 7; ascii_bit = 7;
ascii = lp = 0; ascii = sample_count = 0;
++llp; ++flush_count;
} }
if (llp == FLUSH_TIMEOUT) if (flush_count == FLUSH_TIMEOUT) /* TODO: reset flush count? */
if (fflush(stdout) == EOF) if (fflush(stdout) == EOF)
err(ERR(), NULL); err(ERR(), NULL);
if ((f2 <= FREQ_SEP_MIN) || (f2 >= FREQ_SEP_MAX) if ((freq_separator <= FREQ_SEP_MIN) || (freq_separator >= FREQ_SEP_MAX)
|| (f1 <= FREQ_DATA_MIN) || (f1 >= FREQ_DATA_MAX)) { || (freq_data <= FREQ_DATA_MIN) || (freq_data >= FREQ_DATA_MAX)) {
fetch_sample(); fetch_sample();
return; return;
} }
if (!set_ascii_bit()) if (!set_ascii_bit())
print_char(); print_char();
lp = llp = 0; sample_count = flush_count = 0;
for (int sample = 0; sample < SAMPLES_PER_FRAME; sample++) for (int sample = 0; sample < SAMPLES_PER_FRAME; sample++)
fetch_sample(); fetch_sample();
} }
@ -82,16 +82,18 @@ void
fetch_sample(void) fetch_sample(void)
{ {
static int ringpos = 0; static int ringpos = 0;
f1 -= pulse[ringpos]; freq_data -= pulse[ringpos];
f1 += pulse[(ringpos + SAMPLES_PER_FRAME) % (2 * SAMPLES_PER_FRAME)]; freq_data += pulse[(ringpos + SAMPLES_PER_FRAME)
f2 -= pulse[(ringpos + SAMPLES_PER_FRAME) % (2 * SAMPLES_PER_FRAME)]; % (2 * SAMPLES_PER_FRAME)];
freq_separator -= pulse[(ringpos + SAMPLES_PER_FRAME)
% (2 * SAMPLES_PER_FRAME)];
read_frame(ringpos); read_frame(ringpos);
if ((pulse[ringpos] = (abs(frame[ringpos]) > THRESHOLD) ? 1 : 0)) if ((pulse[ringpos] = (abs(frame[ringpos]) > THRESHOLD) ? 1 : 0))
++f2; ++freq_separator;
++ringpos; ++ringpos;
ringpos %= 2 * SAMPLES_PER_FRAME; ringpos %= 2 * SAMPLES_PER_FRAME;
++lp; ++sample_count;
} }
void void
@ -109,10 +111,10 @@ set_ascii_bit(void)
long stdin_pos = 0; long stdin_pos = 0;
if ((stdin_pos = ftell(stdin)) == -1) if ((stdin_pos = ftell(stdin)) == -1)
err(ERR(), NULL); err(ERR(), NULL);
printf ("%d %d %d @%ld\n", f1, f2, FREQ_DATA_THRESHOLD, printf ("%d %d %d @%ld\n", freq_data, freq_separator,
stdin_pos - sizeof(frame)); FREQ_DATA_THRESHOLD, stdin_pos - sizeof(frame));
#endif #endif
if (f1 < FREQ_DATA_THRESHOLD) if (freq_data < FREQ_DATA_THRESHOLD)
ascii |= (1 << ascii_bit); ascii |= (1 << ascii_bit);
return ascii_bit; return ascii_bit;
} }