mirror of
https://github.com/rehlds/revoice.git
synced 2025-04-11 12:00:15 +03:00
119 lines
6.1 KiB
C
119 lines
6.1 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2012, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, (subject to the limitations in the disclaimer below)
|
|
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 Skype Limited, nor the names of specific
|
|
contributors, may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
|
|
BY THIS LICENSE. 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.
|
|
***********************************************************************/
|
|
|
|
/* *
|
|
* SKP_Silk_resampler_private_up2_HQ.c *
|
|
* *
|
|
* Upsample by a factor 2, high quality *
|
|
* *
|
|
* Copyright 2010 (c), Skype Limited *
|
|
* */
|
|
|
|
#include "SKP_Silk_SigProc_FIX.h"
|
|
#include "SKP_Silk_resampler_private.h"
|
|
|
|
/* Upsample by a factor 2, high quality */
|
|
/* Uses 2nd order allpass filters for the 2x upsampling, followed by a */
|
|
/* notch filter just above Nyquist. */
|
|
void SKP_Silk_resampler_private_up2_HQ(
|
|
SKP_int32 *S, /* I/O: Resampler state [ 6 ] */
|
|
SKP_int16 *out, /* O: Output signal [ 2 * len ] */
|
|
const SKP_int16 *in, /* I: Input signal [ len ] */
|
|
SKP_int32 len /* I: Number of INPUT samples */
|
|
)
|
|
{
|
|
SKP_int32 k;
|
|
SKP_int32 in32, out32_1, out32_2, Y, X;
|
|
|
|
SKP_assert( SKP_Silk_resampler_up2_hq_0[ 0 ] > 0 );
|
|
SKP_assert( SKP_Silk_resampler_up2_hq_0[ 1 ] < 0 );
|
|
SKP_assert( SKP_Silk_resampler_up2_hq_1[ 0 ] > 0 );
|
|
SKP_assert( SKP_Silk_resampler_up2_hq_1[ 1 ] < 0 );
|
|
|
|
/* Internal variables and state are in Q10 format */
|
|
for( k = 0; k < len; k++ ) {
|
|
/* Convert to Q10 */
|
|
in32 = SKP_LSHIFT( (SKP_int32)in[ k ], 10 );
|
|
|
|
/* First all-pass section for even output sample */
|
|
Y = SKP_SUB32( in32, S[ 0 ] );
|
|
X = SKP_SMULWB( Y, SKP_Silk_resampler_up2_hq_0[ 0 ] );
|
|
out32_1 = SKP_ADD32( S[ 0 ], X );
|
|
S[ 0 ] = SKP_ADD32( in32, X );
|
|
|
|
/* Second all-pass section for even output sample */
|
|
Y = SKP_SUB32( out32_1, S[ 1 ] );
|
|
X = SKP_SMLAWB( Y, Y, SKP_Silk_resampler_up2_hq_0[ 1 ] );
|
|
out32_2 = SKP_ADD32( S[ 1 ], X );
|
|
S[ 1 ] = SKP_ADD32( out32_1, X );
|
|
|
|
/* Biquad notch filter */
|
|
out32_2 = SKP_SMLAWB( out32_2, S[ 5 ], SKP_Silk_resampler_up2_hq_notch[ 2 ] );
|
|
out32_2 = SKP_SMLAWB( out32_2, S[ 4 ], SKP_Silk_resampler_up2_hq_notch[ 1 ] );
|
|
out32_1 = SKP_SMLAWB( out32_2, S[ 4 ], SKP_Silk_resampler_up2_hq_notch[ 0 ] );
|
|
S[ 5 ] = SKP_SUB32( out32_2, S[ 5 ] );
|
|
|
|
/* Apply gain in Q15, convert back to int16 and store to output */
|
|
out[ 2 * k ] = (SKP_int16)SKP_SAT16( SKP_RSHIFT32(
|
|
SKP_SMLAWB( 256, out32_1, SKP_Silk_resampler_up2_hq_notch[ 3 ] ), 9 ) );
|
|
|
|
/* First all-pass section for odd output sample */
|
|
Y = SKP_SUB32( in32, S[ 2 ] );
|
|
X = SKP_SMULWB( Y, SKP_Silk_resampler_up2_hq_1[ 0 ] );
|
|
out32_1 = SKP_ADD32( S[ 2 ], X );
|
|
S[ 2 ] = SKP_ADD32( in32, X );
|
|
|
|
/* Second all-pass section for odd output sample */
|
|
Y = SKP_SUB32( out32_1, S[ 3 ] );
|
|
X = SKP_SMLAWB( Y, Y, SKP_Silk_resampler_up2_hq_1[ 1 ] );
|
|
out32_2 = SKP_ADD32( S[ 3 ], X );
|
|
S[ 3 ] = SKP_ADD32( out32_1, X );
|
|
|
|
/* Biquad notch filter */
|
|
out32_2 = SKP_SMLAWB( out32_2, S[ 4 ], SKP_Silk_resampler_up2_hq_notch[ 2 ] );
|
|
out32_2 = SKP_SMLAWB( out32_2, S[ 5 ], SKP_Silk_resampler_up2_hq_notch[ 1 ] );
|
|
out32_1 = SKP_SMLAWB( out32_2, S[ 5 ], SKP_Silk_resampler_up2_hq_notch[ 0 ] );
|
|
S[ 4 ] = SKP_SUB32( out32_2, S[ 4 ] );
|
|
|
|
/* Apply gain in Q15, convert back to int16 and store to output */
|
|
out[ 2 * k + 1 ] = (SKP_int16)SKP_SAT16( SKP_RSHIFT32(
|
|
SKP_SMLAWB( 256, out32_1, SKP_Silk_resampler_up2_hq_notch[ 3 ] ), 9 ) );
|
|
}
|
|
}
|
|
|
|
|
|
void SKP_Silk_resampler_private_up2_HQ_wrapper(
|
|
void *SS, /* I/O: Resampler state (unused) */
|
|
SKP_int16 *out, /* O: Output signal [ 2 * len ] */
|
|
const SKP_int16 *in, /* I: Input signal [ len ] */
|
|
SKP_int32 len /* I: Number of input samples */
|
|
)
|
|
{
|
|
SKP_Silk_resampler_state_struct *S = (SKP_Silk_resampler_state_struct *)SS;
|
|
SKP_Silk_resampler_private_up2_HQ( S->sIIR, out, in, len );
|
|
}
|