New plugin: FFT, A frequency analyzer plugin

There is some more work needed:
- Keymaps are definitely not perfect, touchscreen targets are disabled due to no keymap
- There is no manual yet

Author: Delyan Kratunov 
Flyspray: FS#10065



git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24587 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 6 insertions, 0 deletions

diff --git a/firmware/export/pcm.h b/firmware/export/pcm.h
index 444e0c9c09..b9ad913100 100644
--- a/firmware/export/pcm.h
+++ b/firmware/export/pcm.h
@@ -75,6 +75,7 @@ void pcm_play_data(pcm_more_callback_type get_more,
                    unsigned char* start, size_t size);
 
 void pcm_calculate_peaks(int *left, int *right);
+const void* pcm_get_peak_buffer(int* count);
 size_t pcm_get_bytes_waiting(void);
 
 void pcm_play_stop(void);
diff --git a/firmware/pcm.c b/firmware/pcm.c
index cddb2eaecd..0e89cb90c9 100644
--- a/firmware/pcm.c
+++ b/firmware/pcm.c
@@ -183,6 +183,11 @@ void pcm_calculate_peaks(int *left, int *right)
         *right = peaks[1];
 }
 
+const void* pcm_get_peak_buffer(int * count)
+{
+    return pcm_play_dma_get_peak_buffer(count);
+}
+
 /****************************************************************************
  * Functions that do not require targeted implementation but only a targeted
  * interface