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From: Maxime Even <maximeeven@proton.me>
Date: Mon, 8 Jul 2024 17:41:39 +0200
Subject: spectrogram: convert int16 to unsigned for correct range
p_dest is used to set the height of the column, and it is used
as a variable defined from zero to 2^16 - 1. It is therefore
considered in the rest of the program as an unsigned int 16.
Moreover, the value that we put inside are a sum of two squared
real value, so they are necessarily positive.
(cherry picked from commit 94a8d152eadd53073305c95d221eca7623b4ed6c)
---
modules/visualization/glspectrum.c | 2 +-
modules/visualization/visual/effects.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/modules/visualization/glspectrum.c b/modules/visualization/glspectrum.c
index bf0ffd6..96ee3fe 100644
--- a/modules/visualization/glspectrum.c
+++ b/modules/visualization/glspectrum.c
@@ -381,7 +381,7 @@ static void *Thread( void *p_data )
float p_output[FFT_BUFFER_SIZE]; /* Raw FFT Result */
int16_t p_buffer1[FFT_BUFFER_SIZE]; /* Buffer on which we perform
the FFT (first channel) */
- int16_t p_dest[FFT_BUFFER_SIZE]; /* Adapted FFT result */
+ uint16_t p_dest[FFT_BUFFER_SIZE]; /* Adapted FFT result */
float *p_buffl = (float*)block->p_buffer; /* Original buffer */
int16_t *p_buffs; /* int16_t converted buffer */
diff --git a/modules/visualization/visual/effects.c b/modules/visualization/visual/effects.c
index 9b7b07a..d5a7209 100644
--- a/modules/visualization/visual/effects.c
+++ b/modules/visualization/visual/effects.c
@@ -109,7 +109,7 @@ static int spectrum_Run(visual_effect_t * p_effect, vlc_object_t *p_aout,
int i , j , y , k;
int i_line;
- int16_t p_dest[FFT_BUFFER_SIZE]; /* Adapted FFT result */
+ uint16_t p_dest[FFT_BUFFER_SIZE]; /* Adapted FFT result */
int16_t p_buffer1[FFT_BUFFER_SIZE]; /* Buffer on which we perform
the FFT (first channel) */
@@ -450,7 +450,7 @@ static int spectrometer_Run(visual_effect_t * p_effect, vlc_object_t *p_aout,
int i , j , k;
int i_line = 0;
- int16_t p_dest[FFT_BUFFER_SIZE]; /* Adapted FFT result */
+ uint16_t p_dest[FFT_BUFFER_SIZE]; /* Adapted FFT result */
int16_t p_buffer1[FFT_BUFFER_SIZE]; /* Buffer on which we perform
the FFT (first channel) */
float *p_buffl = /* Original buffer */
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