Audio: DRC: Change DRC to use lookup table based sine function

This change saves about 13 MPCS, from 83 MCPS to 70 MCPS while the .bss RAM usage increases by 1 kB from selecting CONFIG_MATH_LUT_TRIG_FIXED. Signed-off-by: Seppo Ingalsuo <[email protected]>
thesofproject · Jan 9, 2024 · 7c8ae5f · 7c8ae5f
1 parent bbdfa43
commit 7c8ae5f
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Showing 2 changed files with 4 additions and 4 deletions.
diff --git a/src/audio/drc/Kconfig b/src/audio/drc/Kconfig
@@ -3,6 +3,7 @@
 config COMP_DRC
 	bool "Dynamic Range Compressor component"
 	select CORDIC_FIXED
+        select MATH_LUT_TRIG_FIXED
 	select NUMBERS_NORM
 	select MATH_EXP
 	select COMP_BLOB

diff --git a/src/audio/drc/drc_math.h b/src/audio/drc/drc_math.h
@@ -11,6 +11,7 @@
 #include <stdint.h>
 #include <sof/audio/format.h>
 #include <sof/math/numbers.h>
+#include <sof/math/lut_trig.h>
 #include <sof/math/trig.h>
 
 #include "drc_plat_conf.h"
@@ -60,9 +61,8 @@ static inline int32_t drc_sin_fixed(int32_t x)
 {
 	const int32_t lshift = drc_get_lshift(30, 30, 28);
 	int32_t denorm_x = drc_mult_lshift(x, PI_OVER_TWO_Q30, lshift);
-	int32_t sin_val = sin_fixed_16b(denorm_x);
 
-	return sin_val << 16;
+	return sofm_lut_sin_fixed_16b(denorm_x) << 16;
 }
 
 #ifdef DRC_USE_CORDIC_ASIN
@@ -88,9 +88,8 @@ static inline int32_t drc_asin_fixed(int32_t x)
 static inline int32_t drc_sin_fixed(int32_t x)
 {
 	const int32_t PI_OVER_TWO = Q_CONVERT_FLOAT(1.57079632679489661923, 30);
-	int32_t sin_val = sin_fixed_16b(Q_MULTSR_32X32((int64_t)x, PI_OVER_TWO, 30, 30, 28));
 
-	return sin_val << 16;
+	return sofm_lut_sin_fixed_16b(Q_MULTSR_32X32((int64_t)x, PI_OVER_TWO, 30, 30, 28)) << 16;
 }
 
 #ifdef DRC_USE_CORDIC_ASIN