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libavutil: Add new fixed dsp functions.

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Add functions needed for implementation of fixed point aac dec.

Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Nedeljko Babic
2015-06-03 16:00:36 +02:00
committed by Michael Niedermayer
parent 3e34b7498f
commit 1a06d0935f
2 changed files with 121 additions and 0 deletions
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62
libavutil/fixed_dsp.c
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@@ -47,6 +47,28 @@
#include "fixed_dsp.h"
static void vector_fmul_add_c(int *dst, const int *src0, const int *src1, const int *src2, int len){
int i;
int64_t accu;
for (i=0; i<len; i++) {
accu = (int64_t)src0[i] * src1[i];
dst[i] = src2[i] + (int)((accu + 0x40000000) >> 31);
}
}
static void vector_fmul_reverse_c(int *dst, const int *src0, const int *src1, int len)
{
int i;
int64_t accu;
src1 += len-1;
for (i=0; i<len; i++) {
accu = (int64_t)src0[i] * src1[-i];
dst[i] = (int)((accu+0x40000000) >> 31);
}
}
static void vector_fmul_window_scaled_c(int16_t *dst, const int32_t *src0,
const int32_t *src1, const int32_t *win,
int len, uint8_t bits)
@@ -88,6 +110,41 @@ static void vector_fmul_window_c(int32_t *dst, const int32_t *src0,
}
}
static void vector_fmul_c(int *dst, const int *src0, const int *src1, int len)
{
int i;
int64_t accu;
for (i = 0; i < len; i++){
accu = (int64_t)src0[i] * src1[i];
dst[i] = (int)((accu+0x40000000) >> 31);
}
}
static int ff_scalarproduct_fixed_c(const int *v1, const int *v2, int len)
{
/** p is initialized with 0x40000000 so that the proper rounding will occur
* at the end */
int64_t p = 0x40000000;
int i;
for (i = 0; i < len; i++)
p += (int64_t)v1[i] * v2[i];
return (int)(p >> 31);
}
static void butterflies_fixed_c(int *v1, int *v2, int len)
{
int i;
for (i = 0; i < len; i++){
int t = v1[i] - v2[i];
v1[i] += v2[i];
v2[i] = t;
}
}
AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
{
AVFixedDSPContext * fdsp = av_malloc(sizeof(AVFixedDSPContext));
@@ -97,6 +154,11 @@ AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
fdsp->vector_fmul_window_scaled = vector_fmul_window_scaled_c;
fdsp->vector_fmul_window = vector_fmul_window_c;
fdsp->vector_fmul = vector_fmul_c;
fdsp->vector_fmul_add = vector_fmul_add_c;
fdsp->vector_fmul_reverse = vector_fmul_reverse_c;
fdsp->butterflies_fixed = butterflies_fixed_c;
fdsp->scalarproduct_fixed = ff_scalarproduct_fixed_c;
return fdsp;
}