Took the opportunity to undo the Godot changed made to the opus source. The opus module should eventually be built in its own environment to avoid polluting others with too many include dirs and defines. TODO: Fix the platform/ stuff for opus.
108 lines
4.6 KiB
C
108 lines
4.6 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
- Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
- Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
***********************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "SigProc_FIX.h"
|
|
#include "celt_lpc.h"
|
|
|
|
/*******************************************/
|
|
/* LPC analysis filter */
|
|
/* NB! State is kept internally and the */
|
|
/* filter always starts with zero state */
|
|
/* first d output samples are set to zero */
|
|
/*******************************************/
|
|
|
|
void silk_LPC_analysis_filter(
|
|
opus_int16 *out, /* O Output signal */
|
|
const opus_int16 *in, /* I Input signal */
|
|
const opus_int16 *B, /* I MA prediction coefficients, Q12 [order] */
|
|
const opus_int32 len, /* I Signal length */
|
|
const opus_int32 d, /* I Filter order */
|
|
int arch /* I Run-time architecture */
|
|
)
|
|
{
|
|
opus_int j;
|
|
#ifdef FIXED_POINT
|
|
opus_int16 mem[SILK_MAX_ORDER_LPC];
|
|
opus_int16 num[SILK_MAX_ORDER_LPC];
|
|
#else
|
|
int ix;
|
|
opus_int32 out32_Q12, out32;
|
|
const opus_int16 *in_ptr;
|
|
#endif
|
|
|
|
silk_assert( d >= 6 );
|
|
silk_assert( (d & 1) == 0 );
|
|
silk_assert( d <= len );
|
|
|
|
#ifdef FIXED_POINT
|
|
silk_assert( d <= SILK_MAX_ORDER_LPC );
|
|
for ( j = 0; j < d; j++ ) {
|
|
num[ j ] = -B[ j ];
|
|
}
|
|
for (j=0;j<d;j++) {
|
|
mem[ j ] = in[ d - j - 1 ];
|
|
}
|
|
celt_fir( in + d, num, out + d, len - d, d, mem, arch );
|
|
for ( j = 0; j < d; j++ ) {
|
|
out[ j ] = 0;
|
|
}
|
|
#else
|
|
(void)arch;
|
|
for( ix = d; ix < len; ix++ ) {
|
|
in_ptr = &in[ ix - 1 ];
|
|
|
|
out32_Q12 = silk_SMULBB( in_ptr[ 0 ], B[ 0 ] );
|
|
/* Allowing wrap around so that two wraps can cancel each other. The rare
|
|
cases where the result wraps around can only be triggered by invalid streams*/
|
|
out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -1 ], B[ 1 ] );
|
|
out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -2 ], B[ 2 ] );
|
|
out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -3 ], B[ 3 ] );
|
|
out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -4 ], B[ 4 ] );
|
|
out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -5 ], B[ 5 ] );
|
|
for( j = 6; j < d; j += 2 ) {
|
|
out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -j ], B[ j ] );
|
|
out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -j - 1 ], B[ j + 1 ] );
|
|
}
|
|
|
|
/* Subtract prediction */
|
|
out32_Q12 = silk_SUB32_ovflw( silk_LSHIFT( (opus_int32)in_ptr[ 1 ], 12 ), out32_Q12 );
|
|
|
|
/* Scale to Q0 */
|
|
out32 = silk_RSHIFT_ROUND( out32_Q12, 12 );
|
|
|
|
/* Saturate output */
|
|
out[ ix ] = (opus_int16)silk_SAT16( out32 );
|
|
}
|
|
|
|
/* Set first d output samples to zero */
|
|
silk_memset( out, 0, d * sizeof( opus_int16 ) );
|
|
#endif
|
|
}
|