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| author | Jens Arnold <amiconn@rockbox.org> | 2005-08-29 20:07:17 +0000 |
|---|---|---|
| committer | Jens Arnold <amiconn@rockbox.org> | 2005-08-29 20:07:17 +0000 |
| commit | 99a0598c284471342fcda1fdcba90d4b666bfbb3 (patch) | |
| tree | 83cc502095e87277de770456498d2de6cf8f473b /firmware | |
| parent | 89a8ca4408c3ea34464898b0ce52a0d8351fa323 (diff) | |
| download | rockbox-99a0598c284471342fcda1fdcba90d4b666bfbb3.tar.gz rockbox-99a0598c284471342fcda1fdcba90d4b666bfbb3.zip | |
Major peakmeter rework: * Changed set/get functions for dbfs mode to bool type. * Removed performance setting, leaving (slightly adapted) high performance mode only. * Refresh rate is always 20 Hz now. * Readout doesn't do an extra (hidden) peek, should allow for slightly better clip detection. * Brought back high performance peakmeter for recording. Peakmeter stops hogging the CPU when the disk is spinning; this is enough to avoid the performance problem when saving data. * Optimisations, code cleanup and code policeing. * (iriver) Reduced CPU load of peakmeter by not calculating excessive overlaps. ** Bumped config block version, so save your settings before upgrading.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7415 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/pcm_playback.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/firmware/pcm_playback.c b/firmware/pcm_playback.c index f75ec69857..5597f69bdb 100644 --- a/firmware/pcm_playback.c +++ b/firmware/pcm_playback.c | |||
| @@ -99,15 +99,15 @@ static void dma_stop(void) | |||
| 99 | 99 | ||
| 100 | /* | 100 | /* |
| 101 | * This function goes directly into the DMA buffer to calculate the left and | 101 | * This function goes directly into the DMA buffer to calculate the left and |
| 102 | * right peak values. To avoid missing peaks it tries to look forward a full | 102 | * right peak values. To avoid missing peaks it tries to look forward two full |
| 103 | * refresh period (1/20 sec) although it's always possible that the entire | 103 | * peek periods (2/HZ sec, 100% overlap), although it's always possible that |
| 104 | * period will not be visible. To reduce CPU load it only looks at every | 104 | * the entire period will not be visible. To reduce CPU load it only looks at |
| 105 | * third sample, and this can be reduced even further if needed (even every | 105 | * every third sample, and this can be reduced even further if needed (even |
| 106 | * tenth sample would still be pretty accurate). | 106 | * every tenth sample would still be pretty accurate). |
| 107 | */ | 107 | */ |
| 108 | 108 | ||
| 109 | #define PEAK_SAMPLES 2205 /* 44100 sample rate / 20 Hz refresh */ | 109 | #define PEAK_SAMPLES (44100*2/HZ) /* 44100 samples * 2 / 100 Hz tick */ |
| 110 | #define PEAK_STRIDE 3 /* every 3rd sample is plenty... */ | 110 | #define PEAK_STRIDE 3 /* every 3rd sample is plenty... */ |
| 111 | 111 | ||
| 112 | void pcm_calculate_peaks(int *left, int *right) | 112 | void pcm_calculate_peaks(int *left, int *right) |
| 113 | { | 113 | { |