diff options
Diffstat (limited to 'util/spkmodem_recv/spkmodem-recv.c')
| -rw-r--r-- | util/spkmodem_recv/spkmodem-recv.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/util/spkmodem_recv/spkmodem-recv.c b/util/spkmodem_recv/spkmodem-recv.c index aea9ec29..16115bd0 100644 --- a/util/spkmodem_recv/spkmodem-recv.c +++ b/util/spkmodem_recv/spkmodem-recv.c @@ -27,6 +27,7 @@ /* Usage: parec --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv */ #define SAMPLES_PER_FRAME 240 +#define MAX_SAMPLES (2 * SAMPLES_PER_FRAME) #define FREQ_SEP_MIN 5 #define FREQ_SEP_MAX 15 #define FREQ_DATA_MIN 15 @@ -37,7 +38,7 @@ #define ERR() (errno = errno ? errno : ECANCELED) #define reset_char() ascii = 0, ascii_bit = 7 -signed short frame[2 * SAMPLES_PER_FRAME], pulse[2 * SAMPLES_PER_FRAME]; +signed short frame[MAX_SAMPLES], pulse[MAX_SAMPLES]; int ringpos, debug, freq_data, freq_separator, sample_count, ascii_bit = 7; char ascii = 0; @@ -90,17 +91,16 @@ handle_audio(void) void fetch_sample(void) { + int next_ringpos = (ringpos + SAMPLES_PER_FRAME) % MAX_SAMPLES; freq_data -= pulse[ringpos]; - freq_data += pulse[(ringpos + SAMPLES_PER_FRAME) - % (2 * SAMPLES_PER_FRAME)]; - freq_separator -= pulse[(ringpos + SAMPLES_PER_FRAME) - % (2 * SAMPLES_PER_FRAME)]; + freq_data += pulse[next_ringpos]; + freq_separator -= pulse[next_ringpos]; read_frame(); if ((pulse[ringpos] = (abs(frame[ringpos]) > THRESHOLD) ? 1 : 0)) ++freq_separator; ++ringpos; - ringpos %= 2 * SAMPLES_PER_FRAME; + ringpos %= MAX_SAMPLES; ++sample_count; } |