зеркало из https://github.com/mozilla/gecko-dev.git
118 строки
5.3 KiB
C
118 строки
5.3 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2012 IETF Trust and Skype Limited. All rights reserved.
|
|
|
|
This file is extracted from RFC6716. Please see that RFC for additional
|
|
information.
|
|
|
|
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 "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 silk_resampler_private_up2_HQ(
|
|
opus_int32 *S, /* I/O Resampler state [ 6 ] */
|
|
opus_int16 *out, /* O Output signal [ 2 * len ] */
|
|
const opus_int16 *in, /* I Input signal [ len ] */
|
|
opus_int32 len /* I Number of input samples */
|
|
)
|
|
{
|
|
opus_int32 k;
|
|
opus_int32 in32, out32_1, out32_2, Y, X;
|
|
|
|
silk_assert( silk_resampler_up2_hq_0[ 0 ] > 0 );
|
|
silk_assert( silk_resampler_up2_hq_0[ 1 ] > 0 );
|
|
silk_assert( silk_resampler_up2_hq_0[ 2 ] < 0 );
|
|
silk_assert( silk_resampler_up2_hq_1[ 0 ] > 0 );
|
|
silk_assert( silk_resampler_up2_hq_1[ 1 ] > 0 );
|
|
silk_assert( silk_resampler_up2_hq_1[ 2 ] < 0 );
|
|
|
|
/* Internal variables and state are in Q10 format */
|
|
for( k = 0; k < len; k++ ) {
|
|
/* Convert to Q10 */
|
|
in32 = silk_LSHIFT( (opus_int32)in[ k ], 10 );
|
|
|
|
/* First all-pass section for even output sample */
|
|
Y = silk_SUB32( in32, S[ 0 ] );
|
|
X = silk_SMULWB( Y, silk_resampler_up2_hq_0[ 0 ] );
|
|
out32_1 = silk_ADD32( S[ 0 ], X );
|
|
S[ 0 ] = silk_ADD32( in32, X );
|
|
|
|
/* Second all-pass section for even output sample */
|
|
Y = silk_SUB32( out32_1, S[ 1 ] );
|
|
X = silk_SMULWB( Y, silk_resampler_up2_hq_0[ 1 ] );
|
|
out32_2 = silk_ADD32( S[ 1 ], X );
|
|
S[ 1 ] = silk_ADD32( out32_1, X );
|
|
|
|
/* Third all-pass section for even output sample */
|
|
Y = silk_SUB32( out32_2, S[ 2 ] );
|
|
X = silk_SMLAWB( Y, Y, silk_resampler_up2_hq_0[ 2 ] );
|
|
out32_1 = silk_ADD32( S[ 2 ], X );
|
|
S[ 2 ] = silk_ADD32( out32_2, X );
|
|
|
|
/* Apply gain in Q15, convert back to int16 and store to output */
|
|
out[ 2 * k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32_1, 10 ) );
|
|
|
|
/* First all-pass section for odd output sample */
|
|
Y = silk_SUB32( in32, S[ 3 ] );
|
|
X = silk_SMULWB( Y, silk_resampler_up2_hq_1[ 0 ] );
|
|
out32_1 = silk_ADD32( S[ 3 ], X );
|
|
S[ 3 ] = silk_ADD32( in32, X );
|
|
|
|
/* Second all-pass section for odd output sample */
|
|
Y = silk_SUB32( out32_1, S[ 4 ] );
|
|
X = silk_SMULWB( Y, silk_resampler_up2_hq_1[ 1 ] );
|
|
out32_2 = silk_ADD32( S[ 4 ], X );
|
|
S[ 4 ] = silk_ADD32( out32_1, X );
|
|
|
|
/* Third all-pass section for odd output sample */
|
|
Y = silk_SUB32( out32_2, S[ 5 ] );
|
|
X = silk_SMLAWB( Y, Y, silk_resampler_up2_hq_1[ 2 ] );
|
|
out32_1 = silk_ADD32( S[ 5 ], X );
|
|
S[ 5 ] = silk_ADD32( out32_2, X );
|
|
|
|
/* Apply gain in Q15, convert back to int16 and store to output */
|
|
out[ 2 * k + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32_1, 10 ) );
|
|
}
|
|
}
|
|
|
|
void silk_resampler_private_up2_HQ_wrapper(
|
|
void *SS, /* I/O Resampler state (unused) */
|
|
opus_int16 *out, /* O Output signal [ 2 * len ] */
|
|
const opus_int16 *in, /* I Input signal [ len ] */
|
|
opus_int32 len /* I Number of input samples */
|
|
)
|
|
{
|
|
silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS;
|
|
silk_resampler_private_up2_HQ( S->sIIR, out, in, len );
|
|
}
|