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libavutil: Add new fixed dsp functions. 

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
View File

@ -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;
}

59
libavutil/fixed_dsp.h
View File

@ -54,8 +54,13 @@
#include "libavcodec/mathops.h"
typedef struct AVFixedDSPContext {
/* Assume len is a multiple of 16, and arrays are 32-byte aligned */
/* Results of multiplications are scaled down by 31 bit (and rounded) if not
* stated otherwise */
/**
* Overlap/add with window function.
* Result is scaled down by "bits" bits.
* Used primarily by MDCT-based audio codecs.
* Source and destination vectors must overlap exactly or not at all.
*
@ -92,6 +97,60 @@ typedef struct AVFixedDSPContext {
*/
void (*vector_fmul_window)(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len);
/**
* Fixed-point multiplication that calculates the entry wise product of two
* vectors of integers and stores the result in a vector of integers.
*
* @param dst output vector
* constraints: 32-byte aligned
* @param src0 first input vector
* constraints: 32-byte aligned
* @param src1 second input vector
* constraints: 32-byte aligned
* @param len number of elements in the input
* constraints: multiple of 16
*/
void (*vector_fmul)(int *dst, const int *src0, const int *src1,
int len);
void (*vector_fmul_reverse)(int *dst, const int *src0, const int *src1, int len);
/**
* Calculate the entry wise product of two vectors of integers, add a third vector of
* integers and store the result in a vector of integers.
*
* @param dst output vector
* constraints: 32-byte aligned
* @param src0 first input vector
* constraints: 32-byte aligned
* @param src1 second input vector
* constraints: 32-byte aligned
* @param src2 third input vector
* constraints: 32-byte aligned
* @param len number of elements in the input
* constraints: multiple of 16
*/
void (*vector_fmul_add)(int *dst, const int *src0, const int *src1,
const int *src2, int len);
/**
* Calculate the scalar product of two vectors of integers.
*
* @param v1 first vector, 16-byte aligned
* @param v2 second vector, 16-byte aligned
* @param len length of vectors, multiple of 4
*
* @return sum of elementwise products
*/
int (*scalarproduct_fixed)(const int *v1, const int *v2, int len);
/**
* Calculate the sum and difference of two vectors of integers.
*
* @param v1 first input vector, sum output, 16-byte aligned
* @param v2 second input vector, difference output, 16-byte aligned
* @param len length of vectors, multiple of 4
*/
void (*butterflies_fixed)(int *av_restrict v1, int *av_restrict v2, int len);
} AVFixedDSPContext;
/**