mirror of
https://github.com/DrBeef/ioq3quest.git
synced 2024-11-15 00:42:03 +00:00
107 lines
5.1 KiB
C
107 lines
5.1 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 "resampler_private.h"
|
|
#include "stack_alloc.h"
|
|
|
|
static OPUS_INLINE opus_int16 *silk_resampler_private_IIR_FIR_INTERPOL(
|
|
opus_int16 *out,
|
|
opus_int16 *buf,
|
|
opus_int32 max_index_Q16,
|
|
opus_int32 index_increment_Q16
|
|
)
|
|
{
|
|
opus_int32 index_Q16, res_Q15;
|
|
opus_int16 *buf_ptr;
|
|
opus_int32 table_index;
|
|
|
|
/* Interpolate upsampled signal and store in output array */
|
|
for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
|
|
table_index = silk_SMULWB( index_Q16 & 0xFFFF, 12 );
|
|
buf_ptr = &buf[ index_Q16 >> 16 ];
|
|
|
|
res_Q15 = silk_SMULBB( buf_ptr[ 0 ], silk_resampler_frac_FIR_12[ table_index ][ 0 ] );
|
|
res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 1 ], silk_resampler_frac_FIR_12[ table_index ][ 1 ] );
|
|
res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 2 ], silk_resampler_frac_FIR_12[ table_index ][ 2 ] );
|
|
res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 3 ], silk_resampler_frac_FIR_12[ table_index ][ 3 ] );
|
|
res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 4 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 3 ] );
|
|
res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 5 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 2 ] );
|
|
res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 6 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 1 ] );
|
|
res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 7 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 0 ] );
|
|
*out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q15, 15 ) );
|
|
}
|
|
return out;
|
|
}
|
|
/* Upsample using a combination of allpass-based 2x upsampling and FIR interpolation */
|
|
void silk_resampler_private_IIR_FIR(
|
|
void *SS, /* I/O Resampler state */
|
|
opus_int16 out[], /* O Output signal */
|
|
const opus_int16 in[], /* I Input signal */
|
|
opus_int32 inLen /* I Number of input samples */
|
|
)
|
|
{
|
|
silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS;
|
|
opus_int32 nSamplesIn;
|
|
opus_int32 max_index_Q16, index_increment_Q16;
|
|
VARDECL( opus_int16, buf );
|
|
SAVE_STACK;
|
|
|
|
ALLOC( buf, 2 * S->batchSize + RESAMPLER_ORDER_FIR_12, opus_int16 );
|
|
|
|
/* Copy buffered samples to start of buffer */
|
|
silk_memcpy( buf, S->sFIR.i16, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
|
|
|
|
/* Iterate over blocks of frameSizeIn input samples */
|
|
index_increment_Q16 = S->invRatio_Q16;
|
|
while( 1 ) {
|
|
nSamplesIn = silk_min( inLen, S->batchSize );
|
|
|
|
/* Upsample 2x */
|
|
silk_resampler_private_up2_HQ( S->sIIR, &buf[ RESAMPLER_ORDER_FIR_12 ], in, nSamplesIn );
|
|
|
|
max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 + 1 ); /* + 1 because 2x upsampling */
|
|
out = silk_resampler_private_IIR_FIR_INTERPOL( out, buf, max_index_Q16, index_increment_Q16 );
|
|
in += nSamplesIn;
|
|
inLen -= nSamplesIn;
|
|
|
|
if( inLen > 0 ) {
|
|
/* More iterations to do; copy last part of filtered signal to beginning of buffer */
|
|
silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Copy last part of filtered signal to the state for the next call */
|
|
silk_memcpy( S->sFIR.i16, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
|
|
RESTORE_STACK;
|
|
}
|