mirror of
https://github.com/NekoX-Dev/NekoX.git
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216 lines
9.7 KiB
C
216 lines
9.7 KiB
C
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/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/*
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* Matrix of resampling methods used:
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* Fs_out (kHz)
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* 8 12 16 24 48
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*
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* 8 C UF U UF UF
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* 12 AF C UF U UF
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* Fs_in (kHz) 16 D AF C UF UF
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* 24 AF D AF C U
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* 48 AF AF AF D C
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*
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* C -> Copy (no resampling)
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* D -> Allpass-based 2x downsampling
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* U -> Allpass-based 2x upsampling
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* UF -> Allpass-based 2x upsampling followed by FIR interpolation
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* AF -> AR2 filter followed by FIR interpolation
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*/
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#include "resampler_private.h"
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/* Tables with delay compensation values to equalize total delay for different modes */
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static const opus_int8 delay_matrix_enc[ 5 ][ 3 ] = {
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/* in \ out 8 12 16 */
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/* 8 */ { 6, 0, 3 },
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/* 12 */ { 0, 7, 3 },
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/* 16 */ { 0, 1, 10 },
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/* 24 */ { 0, 2, 6 },
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/* 48 */ { 18, 10, 12 }
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};
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static const opus_int8 delay_matrix_dec[ 3 ][ 5 ] = {
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/* in \ out 8 12 16 24 48 */
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/* 8 */ { 4, 0, 2, 0, 0 },
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/* 12 */ { 0, 9, 4, 7, 4 },
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/* 16 */ { 0, 3, 12, 7, 7 }
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};
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/* Simple way to make [8000, 12000, 16000, 24000, 48000] to [0, 1, 2, 3, 4] */
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#define rateID(R) ( ( ( ((R)>>12) - ((R)>16000) ) >> ((R)>24000) ) - 1 )
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#define USE_silk_resampler_copy (0)
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#define USE_silk_resampler_private_up2_HQ_wrapper (1)
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#define USE_silk_resampler_private_IIR_FIR (2)
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#define USE_silk_resampler_private_down_FIR (3)
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/* Initialize/reset the resampler state for a given pair of input/output sampling rates */
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opus_int silk_resampler_init(
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silk_resampler_state_struct *S, /* I/O Resampler state */
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opus_int32 Fs_Hz_in, /* I Input sampling rate (Hz) */
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opus_int32 Fs_Hz_out, /* I Output sampling rate (Hz) */
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opus_int forEnc /* I If 1: encoder; if 0: decoder */
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)
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{
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opus_int up2x;
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/* Clear state */
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silk_memset( S, 0, sizeof( silk_resampler_state_struct ) );
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/* Input checking */
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if( forEnc ) {
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if( ( Fs_Hz_in != 8000 && Fs_Hz_in != 12000 && Fs_Hz_in != 16000 && Fs_Hz_in != 24000 && Fs_Hz_in != 48000 ) ||
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( Fs_Hz_out != 8000 && Fs_Hz_out != 12000 && Fs_Hz_out != 16000 ) ) {
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silk_assert( 0 );
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return -1;
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}
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S->inputDelay = delay_matrix_enc[ rateID( Fs_Hz_in ) ][ rateID( Fs_Hz_out ) ];
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} else {
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if( ( Fs_Hz_in != 8000 && Fs_Hz_in != 12000 && Fs_Hz_in != 16000 ) ||
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( Fs_Hz_out != 8000 && Fs_Hz_out != 12000 && Fs_Hz_out != 16000 && Fs_Hz_out != 24000 && Fs_Hz_out != 48000 ) ) {
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silk_assert( 0 );
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return -1;
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}
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S->inputDelay = delay_matrix_dec[ rateID( Fs_Hz_in ) ][ rateID( Fs_Hz_out ) ];
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}
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S->Fs_in_kHz = silk_DIV32_16( Fs_Hz_in, 1000 );
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S->Fs_out_kHz = silk_DIV32_16( Fs_Hz_out, 1000 );
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/* Number of samples processed per batch */
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S->batchSize = S->Fs_in_kHz * RESAMPLER_MAX_BATCH_SIZE_MS;
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/* Find resampler with the right sampling ratio */
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up2x = 0;
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if( Fs_Hz_out > Fs_Hz_in ) {
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/* Upsample */
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if( Fs_Hz_out == silk_MUL( Fs_Hz_in, 2 ) ) { /* Fs_out : Fs_in = 2 : 1 */
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/* Special case: directly use 2x upsampler */
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S->resampler_function = USE_silk_resampler_private_up2_HQ_wrapper;
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} else {
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/* Default resampler */
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S->resampler_function = USE_silk_resampler_private_IIR_FIR;
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up2x = 1;
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}
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} else if ( Fs_Hz_out < Fs_Hz_in ) {
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/* Downsample */
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S->resampler_function = USE_silk_resampler_private_down_FIR;
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if( silk_MUL( Fs_Hz_out, 4 ) == silk_MUL( Fs_Hz_in, 3 ) ) { /* Fs_out : Fs_in = 3 : 4 */
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S->FIR_Fracs = 3;
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S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR0;
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S->Coefs = silk_Resampler_3_4_COEFS;
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} else if( silk_MUL( Fs_Hz_out, 3 ) == silk_MUL( Fs_Hz_in, 2 ) ) { /* Fs_out : Fs_in = 2 : 3 */
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S->FIR_Fracs = 2;
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S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR0;
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S->Coefs = silk_Resampler_2_3_COEFS;
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} else if( silk_MUL( Fs_Hz_out, 2 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 2 */
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S->FIR_Fracs = 1;
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S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR1;
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S->Coefs = silk_Resampler_1_2_COEFS;
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} else if( silk_MUL( Fs_Hz_out, 3 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 3 */
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S->FIR_Fracs = 1;
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S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
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S->Coefs = silk_Resampler_1_3_COEFS;
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} else if( silk_MUL( Fs_Hz_out, 4 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 4 */
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S->FIR_Fracs = 1;
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S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
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S->Coefs = silk_Resampler_1_4_COEFS;
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} else if( silk_MUL( Fs_Hz_out, 6 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 6 */
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S->FIR_Fracs = 1;
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S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
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S->Coefs = silk_Resampler_1_6_COEFS;
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} else {
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/* None available */
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silk_assert( 0 );
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return -1;
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}
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} else {
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/* Input and output sampling rates are equal: copy */
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S->resampler_function = USE_silk_resampler_copy;
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}
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/* Ratio of input/output samples */
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S->invRatio_Q16 = silk_LSHIFT32( silk_DIV32( silk_LSHIFT32( Fs_Hz_in, 14 + up2x ), Fs_Hz_out ), 2 );
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/* Make sure the ratio is rounded up */
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while( silk_SMULWW( S->invRatio_Q16, Fs_Hz_out ) < silk_LSHIFT32( Fs_Hz_in, up2x ) ) {
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S->invRatio_Q16++;
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}
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return 0;
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}
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/* Resampler: convert from one sampling rate to another */
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/* Input and output sampling rate are at most 48000 Hz */
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opus_int silk_resampler(
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silk_resampler_state_struct *S, /* I/O Resampler state */
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opus_int16 out[], /* O Output signal */
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const opus_int16 in[], /* I Input signal */
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opus_int32 inLen /* I Number of input samples */
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)
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{
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opus_int nSamples;
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/* Need at least 1 ms of input data */
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silk_assert( inLen >= S->Fs_in_kHz );
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/* Delay can't exceed the 1 ms of buffering */
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silk_assert( S->inputDelay <= S->Fs_in_kHz );
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nSamples = S->Fs_in_kHz - S->inputDelay;
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/* Copy to delay buffer */
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silk_memcpy( &S->delayBuf[ S->inputDelay ], in, nSamples * sizeof( opus_int16 ) );
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switch( S->resampler_function ) {
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case USE_silk_resampler_private_up2_HQ_wrapper:
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silk_resampler_private_up2_HQ_wrapper( S, out, S->delayBuf, S->Fs_in_kHz );
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silk_resampler_private_up2_HQ_wrapper( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
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break;
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case USE_silk_resampler_private_IIR_FIR:
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silk_resampler_private_IIR_FIR( S, out, S->delayBuf, S->Fs_in_kHz );
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silk_resampler_private_IIR_FIR( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
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break;
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case USE_silk_resampler_private_down_FIR:
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silk_resampler_private_down_FIR( S, out, S->delayBuf, S->Fs_in_kHz );
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silk_resampler_private_down_FIR( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
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break;
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default:
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silk_memcpy( out, S->delayBuf, S->Fs_in_kHz * sizeof( opus_int16 ) );
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silk_memcpy( &out[ S->Fs_out_kHz ], &in[ nSamples ], ( inLen - S->Fs_in_kHz ) * sizeof( opus_int16 ) );
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}
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/* Copy to delay buffer */
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silk_memcpy( S->delayBuf, &in[ inLen - S->inputDelay ], S->inputDelay * sizeof( opus_int16 ) );
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return 0;
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}
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