diff options
| author | Leah Rowe <leah@libreboot.org> | 2023-06-13 20:47:17 +0100 |
|---|---|---|
| committer | Leah Rowe <leah@libreboot.org> | 2023-06-13 20:47:17 +0100 |
| commit | 5c5c1c64fd29f85644771810820ab912e75bc747 (patch) | |
| tree | aeebd1fd5b89bf7b48143299e6bf009598f869bc /util | |
| parent | f257eb6f9d866b5ec959106807bcaaee2262adbf (diff) | |
util/spkmodem-recv: cleaner ring buffer handling
make it more obvious that this *is* a ring buffer being
handled, and make it more obvious when checking a pulse
in the next frame
Signed-off-by: Leah Rowe <leah@libreboot.org>
Diffstat (limited to 'util')
| -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 aea9ec2..16115bd 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; } |