1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/resampler_private_IIR_FIR.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,107 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "SigProc_FIX.h"
1.36 +#include "resampler_private.h"
1.37 +#include "stack_alloc.h"
1.38 +
1.39 +static OPUS_INLINE opus_int16 *silk_resampler_private_IIR_FIR_INTERPOL(
1.40 + opus_int16 *out,
1.41 + opus_int16 *buf,
1.42 + opus_int32 max_index_Q16,
1.43 + opus_int32 index_increment_Q16
1.44 +)
1.45 +{
1.46 + opus_int32 index_Q16, res_Q15;
1.47 + opus_int16 *buf_ptr;
1.48 + opus_int32 table_index;
1.49 +
1.50 + /* Interpolate upsampled signal and store in output array */
1.51 + for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
1.52 + table_index = silk_SMULWB( index_Q16 & 0xFFFF, 12 );
1.53 + buf_ptr = &buf[ index_Q16 >> 16 ];
1.54 +
1.55 + res_Q15 = silk_SMULBB( buf_ptr[ 0 ], silk_resampler_frac_FIR_12[ table_index ][ 0 ] );
1.56 + res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 1 ], silk_resampler_frac_FIR_12[ table_index ][ 1 ] );
1.57 + res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 2 ], silk_resampler_frac_FIR_12[ table_index ][ 2 ] );
1.58 + res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 3 ], silk_resampler_frac_FIR_12[ table_index ][ 3 ] );
1.59 + res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 4 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 3 ] );
1.60 + res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 5 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 2 ] );
1.61 + res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 6 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 1 ] );
1.62 + res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 7 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 0 ] );
1.63 + *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q15, 15 ) );
1.64 + }
1.65 + return out;
1.66 +}
1.67 +/* Upsample using a combination of allpass-based 2x upsampling and FIR interpolation */
1.68 +void silk_resampler_private_IIR_FIR(
1.69 + void *SS, /* I/O Resampler state */
1.70 + opus_int16 out[], /* O Output signal */
1.71 + const opus_int16 in[], /* I Input signal */
1.72 + opus_int32 inLen /* I Number of input samples */
1.73 +)
1.74 +{
1.75 + silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS;
1.76 + opus_int32 nSamplesIn;
1.77 + opus_int32 max_index_Q16, index_increment_Q16;
1.78 + VARDECL( opus_int16, buf );
1.79 + SAVE_STACK;
1.80 +
1.81 + ALLOC( buf, 2 * S->batchSize + RESAMPLER_ORDER_FIR_12, opus_int16 );
1.82 +
1.83 + /* Copy buffered samples to start of buffer */
1.84 + silk_memcpy( buf, S->sFIR.i16, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
1.85 +
1.86 + /* Iterate over blocks of frameSizeIn input samples */
1.87 + index_increment_Q16 = S->invRatio_Q16;
1.88 + while( 1 ) {
1.89 + nSamplesIn = silk_min( inLen, S->batchSize );
1.90 +
1.91 + /* Upsample 2x */
1.92 + silk_resampler_private_up2_HQ( S->sIIR, &buf[ RESAMPLER_ORDER_FIR_12 ], in, nSamplesIn );
1.93 +
1.94 + max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 + 1 ); /* + 1 because 2x upsampling */
1.95 + out = silk_resampler_private_IIR_FIR_INTERPOL( out, buf, max_index_Q16, index_increment_Q16 );
1.96 + in += nSamplesIn;
1.97 + inLen -= nSamplesIn;
1.98 +
1.99 + if( inLen > 0 ) {
1.100 + /* More iterations to do; copy last part of filtered signal to beginning of buffer */
1.101 + silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
1.102 + } else {
1.103 + break;
1.104 + }
1.105 + }
1.106 +
1.107 + /* Copy last part of filtered signal to the state for the next call */
1.108 + silk_memcpy( S->sFIR.i16, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
1.109 + RESTORE_STACK;
1.110 +}
