ref: 66767ee837b6bd545f982e6f89f563e02b507ea1
dir: /silk/fixed/vector_ops_FIX.c/
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "SigProc_FIX.h"
/* Copy and multiply a vector by a constant */
void silk_scale_copy_vector16(
opus_int16 *data_out,
const opus_int16 *data_in,
opus_int32 gain_Q16, /* I Gain in Q16 */
const opus_int dataSize /* I Length */
)
{
opus_int i;
opus_int32 tmp32;
for( i = 0; i < dataSize; i++ ) {
tmp32 = silk_SMULWB( gain_Q16, data_in[ i ] );
data_out[ i ] = (opus_int16)silk_CHECK_FIT16( tmp32 );
}
}
/* Multiply a vector by a constant */
void silk_scale_vector32_Q26_lshift_18(
opus_int32 *data1, /* I/O Q0/Q18 */
opus_int32 gain_Q26, /* I Q26 */
opus_int dataSize /* I length */
)
{
opus_int i;
for( i = 0; i < dataSize; i++ ) {
data1[ i ] = (opus_int32)silk_CHECK_FIT32( silk_RSHIFT64( silk_SMULL( data1[ i ], gain_Q26 ), 8 ) ); /* OUTPUT: Q18 */
}
}
/* sum = for(i=0;i<len;i++)inVec1[i]*inVec2[i]; --- inner product */
/* Note for ARM asm: */
/* * inVec1 and inVec2 should be at least 2 byte aligned. */
/* * len should be positive 16bit integer. */
/* * only when len>6, memory access can be reduced by half. */
opus_int32 silk_inner_prod_aligned(
const opus_int16 *const inVec1, /* I input vector 1 */
const opus_int16 *const inVec2, /* I input vector 2 */
const opus_int len /* I vector lengths */
)
{
opus_int i;
opus_int32 sum = 0;
for( i = 0; i < len; i++ ) {
sum = silk_SMLABB( sum, inVec1[ i ], inVec2[ i ] );
}
return sum;
}
opus_int64 silk_inner_prod16_aligned_64(
const opus_int16 *inVec1, /* I input vector 1 */
const opus_int16 *inVec2, /* I input vector 2 */
const opus_int len /* I vector lengths */
)
{
opus_int i;
opus_int64 sum = 0;
for( i = 0; i < len; i++ ) {
sum = silk_SMLALBB( sum, inVec1[ i ], inVec2[ i ] );
}
return sum;
}
/* Function that returns the maximum absolut value of the input vector */
opus_int16 silk_int16_array_maxabs( /* O Maximum absolute value, max: 2^15-1 */
const opus_int16 *vec, /* I Input vector [len] */
const opus_int32 len /* I Length of input vector */
)
{
opus_int32 max = 0, i, lvl = 0, ind;
if( len == 0 ) return 0;
ind = len - 1;
max = silk_SMULBB( vec[ ind ], vec[ ind ] );
for( i = len - 2; i >= 0; i-- ) {
lvl = silk_SMULBB( vec[ i ], vec[ i ] );
if( lvl > max ) {
max = lvl;
ind = i;
}
}
/* Do not return 32768, as it will not fit in an int16 so may lead to problems later on */
if( max >= 1073676289 ) { /* (2^15-1)^2 = 1073676289 */
return( silk_int16_MAX );
} else {
if( vec[ ind ] < 0 ) {
return( -vec[ ind ] );
} else {
return( vec[ ind ] );
}
}
}