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-rw-r--r--src/opus-1.0.2/silk/CNG.c167
1 files changed, 0 insertions, 167 deletions
diff --git a/src/opus-1.0.2/silk/CNG.c b/src/opus-1.0.2/silk/CNG.c
deleted file mode 100644
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--- a/src/opus-1.0.2/silk/CNG.c
+++ /dev/null
@@ -1,167 +0,0 @@
-/***********************************************************************
-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 "main.h"
-
-/* Generates excitation for CNG LPC synthesis */
-static inline void silk_CNG_exc(
- opus_int32 residual_Q10[], /* O CNG residual signal Q10 */
- opus_int32 exc_buf_Q14[], /* I Random samples buffer Q10 */
- opus_int32 Gain_Q16, /* I Gain to apply */
- opus_int length, /* I Length */
- opus_int32 *rand_seed /* I/O Seed to random index generator */
-)
-{
- opus_int32 seed;
- opus_int i, idx, exc_mask;
-
- exc_mask = CNG_BUF_MASK_MAX;
- while( exc_mask > length ) {
- exc_mask = silk_RSHIFT( exc_mask, 1 );
- }
-
- seed = *rand_seed;
- for( i = 0; i < length; i++ ) {
- seed = silk_RAND( seed );
- idx = (opus_int)( silk_RSHIFT( seed, 24 ) & exc_mask );
- silk_assert( idx >= 0 );
- silk_assert( idx <= CNG_BUF_MASK_MAX );
- residual_Q10[ i ] = (opus_int16)silk_SAT16( silk_SMULWW( exc_buf_Q14[ idx ], Gain_Q16 >> 4 ) );
- }
- *rand_seed = seed;
-}
-
-void silk_CNG_Reset(
- silk_decoder_state *psDec /* I/O Decoder state */
-)
-{
- opus_int i, NLSF_step_Q15, NLSF_acc_Q15;
-
- NLSF_step_Q15 = silk_DIV32_16( silk_int16_MAX, psDec->LPC_order + 1 );
- NLSF_acc_Q15 = 0;
- for( i = 0; i < psDec->LPC_order; i++ ) {
- NLSF_acc_Q15 += NLSF_step_Q15;
- psDec->sCNG.CNG_smth_NLSF_Q15[ i ] = NLSF_acc_Q15;
- }
- psDec->sCNG.CNG_smth_Gain_Q16 = 0;
- psDec->sCNG.rand_seed = 3176576;
-}
-
-/* Updates CNG estimate, and applies the CNG when packet was lost */
-void silk_CNG(
- silk_decoder_state *psDec, /* I/O Decoder state */
- silk_decoder_control *psDecCtrl, /* I/O Decoder control */
- opus_int16 frame[], /* I/O Signal */
- opus_int length /* I Length of residual */
-)
-{
- opus_int i, subfr;
- opus_int32 sum_Q6, max_Gain_Q16;
- opus_int16 A_Q12[ MAX_LPC_ORDER ];
- opus_int32 CNG_sig_Q10[ MAX_FRAME_LENGTH + MAX_LPC_ORDER ];
- silk_CNG_struct *psCNG = &psDec->sCNG;
-
- if( psDec->fs_kHz != psCNG->fs_kHz ) {
- /* Reset state */
- silk_CNG_Reset( psDec );
-
- psCNG->fs_kHz = psDec->fs_kHz;
- }
- if( psDec->lossCnt == 0 && psDec->prevSignalType == TYPE_NO_VOICE_ACTIVITY ) {
- /* Update CNG parameters */
-
- /* Smoothing of LSF's */
- for( i = 0; i < psDec->LPC_order; i++ ) {
- psCNG->CNG_smth_NLSF_Q15[ i ] += silk_SMULWB( (opus_int32)psDec->prevNLSF_Q15[ i ] - (opus_int32)psCNG->CNG_smth_NLSF_Q15[ i ], CNG_NLSF_SMTH_Q16 );
- }
- /* Find the subframe with the highest gain */
- max_Gain_Q16 = 0;
- subfr = 0;
- for( i = 0; i < psDec->nb_subfr; i++ ) {
- if( psDecCtrl->Gains_Q16[ i ] > max_Gain_Q16 ) {
- max_Gain_Q16 = psDecCtrl->Gains_Q16[ i ];
- subfr = i;
- }
- }
- /* Update CNG excitation buffer with excitation from this subframe */
- silk_memmove( &psCNG->CNG_exc_buf_Q14[ psDec->subfr_length ], psCNG->CNG_exc_buf_Q14, ( psDec->nb_subfr - 1 ) * psDec->subfr_length * sizeof( opus_int32 ) );
- silk_memcpy( psCNG->CNG_exc_buf_Q14, &psDec->exc_Q14[ subfr * psDec->subfr_length ], psDec->subfr_length * sizeof( opus_int32 ) );
-
- /* Smooth gains */
- for( i = 0; i < psDec->nb_subfr; i++ ) {
- psCNG->CNG_smth_Gain_Q16 += silk_SMULWB( psDecCtrl->Gains_Q16[ i ] - psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_Q16 );
- }
- }
-
- /* Add CNG when packet is lost or during DTX */
- if( psDec->lossCnt ) {
-
- /* Generate CNG excitation */
- silk_CNG_exc( CNG_sig_Q10 + MAX_LPC_ORDER, psCNG->CNG_exc_buf_Q14, psCNG->CNG_smth_Gain_Q16, length, &psCNG->rand_seed );
-
- /* Convert CNG NLSF to filter representation */
- silk_NLSF2A( A_Q12, psCNG->CNG_smth_NLSF_Q15, psDec->LPC_order );
-
- /* Generate CNG signal, by synthesis filtering */
- silk_memcpy( CNG_sig_Q10, psCNG->CNG_synth_state, MAX_LPC_ORDER * sizeof( opus_int32 ) );
- for( i = 0; i < length; i++ ) {
- silk_assert( psDec->LPC_order == 10 || psDec->LPC_order == 16 );
- /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
- sum_Q6 = silk_RSHIFT( psDec->LPC_order, 1 );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 1 ], A_Q12[ 0 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 2 ], A_Q12[ 1 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 3 ], A_Q12[ 2 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 4 ], A_Q12[ 3 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 5 ], A_Q12[ 4 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 6 ], A_Q12[ 5 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 7 ], A_Q12[ 6 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 8 ], A_Q12[ 7 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 9 ], A_Q12[ 8 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 10 ], A_Q12[ 9 ] );
- if( psDec->LPC_order == 16 ) {
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 11 ], A_Q12[ 10 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 12 ], A_Q12[ 11 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 13 ], A_Q12[ 12 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 14 ], A_Q12[ 13 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 15 ], A_Q12[ 14 ] );
- sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 16 ], A_Q12[ 15 ] );
- }
-
- /* Update states */
- CNG_sig_Q10[ MAX_LPC_ORDER + i ] = silk_ADD_LSHIFT( CNG_sig_Q10[ MAX_LPC_ORDER + i ], sum_Q6, 4 );
-
- frame[ i ] = silk_ADD_SAT16( frame[ i ], silk_RSHIFT_ROUND( sum_Q6, 6 ) );
- }
- silk_memcpy( psCNG->CNG_synth_state, &CNG_sig_Q10[ length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
- } else {
- silk_memset( psCNG->CNG_synth_state, 0, psDec->LPC_order * sizeof( opus_int32 ) );
- }
-}
generated by cgit (git 2.34.1) at 2024-11-15 18:41:18 +0000