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Add intrinsics saturation feature

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This commit is contained in:
Antoine SOULIER
2022-05-04 13:58:30 +02:00
parent 40849c3fa9
commit 29421b2259
2 changed files with 17 additions and 5 deletions
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src/common.h
+14
View File
@@ -29,11 +29,16 @@
#include <limits.h>
#include <string.h>
#ifdef __ARM_ARCH
#include <arm_acle.h>
#endif
/**
* Macros
* MIN/MAX Minimum and maximum between 2 values
* CLIP Clip a value between low and high limits
* SATXX Saturation on 'xx' bits
* ABS Return the absolute value
*/
@@ -41,9 +46,18 @@
#define LC3_MAX(a, b) ( (a) > (b) ? (a) : (b) )
#define LC3_CLIP(v, min, max) LC3_MIN(LC3_MAX(v, min), max)
#ifdef __ARM_FEATURE_SAT
#define LC3_SAT16(v) __ssat(v, 16)
#define LC3_SAT24(v) __ssat(v, 24)
#else
#define LC3_SAT16(v) LC3_CLIP(v, -(1 << 15), (1 << 15) - 1)
#define LC3_SAT24(v) LC3_CLIP(v, -(1 << 23), (1 << 23) - 1)
#endif
#define LC3_ABS(n) ( (n) < 0 ? -(n) : (n) )
/**
* Convert `dt` in us and `sr` in KHz
*/
src/lc3.c
+3 -5
View File
@@ -366,8 +366,8 @@ static void store_s16(
int ns = LC3_NS(dt, sr);
for ( ; ns > 0; ns--, xs++, pcm += stride) {
int s = *xs >= 0 ? (int)(*xs + 0.5f) : (int)(*xs - 0.5f);
*pcm = LC3_CLIP(s, INT16_MIN, INT16_MAX);
int32_t s = *xs >= 0 ? (int)(*xs + 0.5f) : (int)(*xs - 0.5f);
*pcm = LC3_SAT16(s);
}
}
@@ -380,8 +380,6 @@ static void store_s24(
struct lc3_decoder *decoder, void *_pcm, int stride)
{
int32_t *pcm = _pcm;
const int32_t int24_max = (1 << 23) - 1;
const int32_t int24_min = -(1 << 23);
enum lc3_dt dt = decoder->dt;
enum lc3_srate sr = decoder->sr_pcm;
@@ -392,7 +390,7 @@ static void store_s24(
for ( ; ns > 0; ns--, xs++, pcm += stride) {
int32_t s = *xs >= 0 ? (int32_t)(ldexpf(*xs, 8) + 0.5f)
: (int32_t)(ldexpf(*xs, 8) - 0.5f);
*pcm = LC3_CLIP(s, int24_min, int24_max);
*pcm = LC3_SAT24(s);
}
}