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| author | Peter D'Hoye <peter.dhoye@gmail.com> | 2006-08-16 23:26:55 +0000 |
|---|---|---|
| committer | Peter D'Hoye <peter.dhoye@gmail.com> | 2006-08-16 23:26:55 +0000 |
| commit | 5fc66e58dd8a62099cfb1c3f7ae48d7115376be3 (patch) | |
| tree | 0dc6123bb179a5eba4953d62155a4b48dea75869 /apps/recorder/peakmeter.c | |
| parent | c5a24c69221dbd8f2c55f007d9d7eaa2222fa5df (diff) | |
| download | rockbox-5fc66e58dd8a62099cfb1c3f7ae48d7115376be3.tar.gz rockbox-5fc66e58dd8a62099cfb1c3f7ae48d7115376be3.zip | |
Automatic Gain Control during recording. At this point only compiled for iriver h1x0 and h3x0. Patch FS#4748 by Jvo Studer, Martin Scarratt and myself.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10625 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/recorder/peakmeter.c')
| -rw-r--r-- | apps/recorder/peakmeter.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/apps/recorder/peakmeter.c b/apps/recorder/peakmeter.c index 0f8da98308..58c85b2161 100644 --- a/apps/recorder/peakmeter.c +++ b/apps/recorder/peakmeter.c @@ -62,6 +62,10 @@ static int pm_cur_left; /* current values (last peak_meter_peek) */ static int pm_cur_right; static int pm_max_left; /* maximum values between peak meter draws */ static int pm_max_right; +#ifdef HAVE_AGC +static int pm_peakhold_left; /* max. peak values between peakhold calls */ +static int pm_peakhold_right; /* used for AGC and histogram display */ +#endif /* Clip hold */ static bool pm_clip_left = false; /* when true a clip has occurred */ @@ -716,6 +720,10 @@ static int peak_meter_read_l(void) by peak_meter_peek since the last call of peak_meter_read_l */ int retval = pm_max_left; +#ifdef HAVE_AGC + /* store max peak value for peak_meter_get_peakhold_x readout */ + pm_peakhold_left = MAX(pm_max_left, pm_peakhold_left); +#endif #ifdef PM_DEBUG peek_calls = 0; #endif @@ -737,6 +745,10 @@ static int peak_meter_read_r(void) by peak_meter_peek since the last call of peak_meter_read_r */ int retval = pm_max_right; +#ifdef HAVE_AGC + /* store max peak value for peak_meter_get_peakhold_x readout */ + pm_peakhold_right = MAX(pm_max_right, pm_peakhold_right); +#endif #ifdef PM_DEBUG peek_calls = 0; #endif @@ -746,6 +758,23 @@ static int peak_meter_read_r(void) return retval; } +#ifdef HAVE_AGC +/** + * Reads out the current peak-hold values since the last call. + * This is used by the histogram feature in the recording screen. + * Values are in the range 0 <= peak_x < MAX_PEAK. MAX_PEAK is typ 32767. + */ +extern void peak_meter_get_peakhold(int *peak_left, int *peak_right) +{ + if (peak_left) + *peak_left = pm_peakhold_left; + if (peak_right) + *peak_right = pm_peakhold_right; + pm_peakhold_left = 0; + pm_peakhold_right = 0; +} +#endif + /** * Reset the detected clips. This method is for * use by the user interface. |