You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
113 lines
5.2 KiB
113 lines
5.2 KiB
/*********************************************************************** |
|
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 "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 ); |
|
}
|
|
|