diff options
Diffstat (limited to 'util/spkmodem_recv/spkmodem-recv.c')
| -rw-r--r-- | util/spkmodem_recv/spkmodem-recv.c | 111 |
1 files changed, 54 insertions, 57 deletions
diff --git a/util/spkmodem_recv/spkmodem-recv.c b/util/spkmodem_recv/spkmodem-recv.c index cd7bd483..d31e6f8c 100644 --- a/util/spkmodem_recv/spkmodem-recv.c +++ b/util/spkmodem_recv/spkmodem-recv.c @@ -5,7 +5,7 @@ #include <stdlib.h> #include <string.h> -/* Compilation: gcc -o spkmodem-recv spkmodem-recv */ +/* Compilation: gcc -o spkmodem-recv spkmodem-recv */ /* Usage: parec --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv */ #define SAMPLES_PER_TRAME 240 @@ -29,72 +29,69 @@ static int lp = 0; static void read_sample (void) { - amplitude -= abs (trame[ringpos]); - f1 -= pulse[ringpos]; - f1 += pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)]; - f2 -= pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)]; - fread (trame + ringpos, 1, sizeof (trame[0]), stdin); - amplitude += abs (trame[ringpos]); + amplitude -= abs (trame[ringpos]); + f1 -= pulse[ringpos]; + f1 += pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)]; + f2 -= pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)]; + fread (trame + ringpos, 1, sizeof (trame[0]), stdin); + amplitude += abs (trame[ringpos]); - if (pos ? (trame[ringpos] < -THRESHOLD) - : (trame[ringpos] > +THRESHOLD)) - { - pulse[ringpos] = 1; - pos = !pos; - f2++; - } - else - pulse[ringpos] = 0; - ringpos++; - ringpos %= 2 * SAMPLES_PER_TRAME; - lp++; + if (pos ? (trame[ringpos] < -THRESHOLD) + : (trame[ringpos] > +THRESHOLD)) { + pulse[ringpos] = 1; + pos = !pos; + f2++; + } else { + pulse[ringpos] = 0; + } + + ringpos++; + ringpos %= 2 * SAMPLES_PER_TRAME; + lp++; } int main () { - int bitn = 7; - char c = 0; - int i; - int llp = 0; - while (!feof (stdin)) - { - if (lp > 3 * SAMPLES_PER_TRAME) - { - bitn = 7; - c = 0; - lp = 0; - llp++; - } - if (llp == FLUSH_TIMEOUT) - fflush (stdout); - if (f2 > FREQ_SEP_MIN && f2 < FREQ_SEP_MAX - && f1 > FREQ_DATA_MIN && f1 < FREQ_DATA_MAX) - { + int bitn = 7; + char c = 0; + int i; + int llp = 0; + while (!feof (stdin)) { + if (lp > 3 * SAMPLES_PER_TRAME) { + bitn = 7; + c = 0; + lp = 0; + llp++; + } + if (llp == FLUSH_TIMEOUT) + fflush (stdout); + + if (f2 > FREQ_SEP_MIN && f2 < FREQ_SEP_MAX + && f1 > FREQ_DATA_MIN && f1 < FREQ_DATA_MAX) { #if DEBUG - printf ("%d %d %d @%d\n", f1, f2, FREQ_DATA_THRESHOLD, - ftell (stdin) - sizeof (trame)); + printf ("%d %d %d @%d\n", f1, f2, FREQ_DATA_THRESHOLD, + ftell (stdin) - sizeof (trame)); #endif - if (f1 < FREQ_DATA_THRESHOLD) - c |= (1 << bitn); - bitn--; - if (bitn < 0) - { + if (f1 < FREQ_DATA_THRESHOLD) + c |= (1 << bitn); + bitn--; + if (bitn < 0) { #if DEBUG - printf ("<%c, %x>", c, c); + printf ("<%c, %x>", c, c); #else - printf ("%c", c); + printf ("%c", c); #endif - bitn = 7; - c = 0; - } - lp = 0; - llp = 0; - for (i = 0; i < SAMPLES_PER_TRAME; i++) - read_sample (); - continue; + bitn = 7; + c = 0; + } + lp = 0; + llp = 0; + for (i = 0; i < SAMPLES_PER_TRAME; i++) + read_sample (); + continue; + } + read_sample (); } - read_sample (); - } - return 0; + return 0; } |