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author | Jean-Marc Valin <jean-marc.valin@octasic.com> | 2011-04-28 16:24:29 -0400 |
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committer | Jean-Marc Valin <jean-marc.valin@octasic.com> | 2011-04-28 16:24:29 -0400 |
commit | 310af750eb5726b4143a43208f2bc03677c6f5db (patch) | |
tree | 8c2a6134a16c32a0bd94e030a782d90d117808f4 /src_common/SKP_Silk_CNG.c | |
parent | 011402a252450a6883f109a86e5dd7e24aa0d3a0 (diff) | |
download | opus-310af750eb5726b4143a43208f2bc03677c6f5db.tar.gz |
Moved all SILK source code to the silk/ directory
Diffstat (limited to 'src_common/SKP_Silk_CNG.c')
-rw-r--r-- | src_common/SKP_Silk_CNG.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/src_common/SKP_Silk_CNG.c b/src_common/SKP_Silk_CNG.c deleted file mode 100644 index 41128ef2..00000000 --- a/src_common/SKP_Silk_CNG.c +++ /dev/null @@ -1,149 +0,0 @@ -/***********************************************************************
-Copyright (c) 2006-2011, Skype Limited. All rights reserved.
-Redistribution and use in source and binary forms, with or without
-modification, (subject to the limitations in the disclaimer below)
-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 Skype Limited, nor the names of specific
-contributors, may be used to endorse or promote products derived from
-this software without specific prior written permission.
-NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
-BY THIS LICENSE. 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.
-***********************************************************************/
-
-#include "SKP_Silk_main.h"
-
-/* Generates excitation for CNG LPC synthesis */
-SKP_INLINE void SKP_Silk_CNG_exc(
- SKP_int16 residual[], /* O CNG residual signal Q0 */
- SKP_int32 exc_buf_Q10[], /* I Random samples buffer Q10 */
- SKP_int32 Gain_Q16, /* I Gain to apply */
- SKP_int length, /* I Length */
- SKP_int32 *rand_seed /* I/O Seed to random index generator */
-)
-{
- SKP_int32 seed;
- SKP_int i, idx, exc_mask;
-
- exc_mask = CNG_BUF_MASK_MAX;
- while( exc_mask > length ) {
- exc_mask = SKP_RSHIFT( exc_mask, 1 );
- }
-
- seed = *rand_seed;
- for( i = 0; i < length; i++ ) {
- seed = SKP_RAND( seed );
- idx = ( SKP_int )( SKP_RSHIFT( seed, 24 ) & exc_mask );
- SKP_assert( idx >= 0 );
- SKP_assert( idx <= CNG_BUF_MASK_MAX );
- residual[ i ] = ( SKP_int16 )SKP_SAT16( SKP_RSHIFT_ROUND( SKP_SMULWW( exc_buf_Q10[ idx ], Gain_Q16 ), 10 ) );
- }
- *rand_seed = seed;
-}
-
-void SKP_Silk_CNG_Reset(
- SKP_Silk_decoder_state *psDec /* I/O Decoder state */
-)
-{
- SKP_int i, NLSF_step_Q15, NLSF_acc_Q15;
-
- NLSF_step_Q15 = SKP_DIV32_16( SKP_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 SKP_Silk_CNG(
- SKP_Silk_decoder_state *psDec, /* I/O Decoder state */
- SKP_Silk_decoder_control *psDecCtrl, /* I/O Decoder control */
- SKP_int16 signal[], /* I/O Signal */
- SKP_int length /* I Length of residual */
-)
-{
- SKP_int i, subfr;
- SKP_int32 tmp_32, Gain_Q26, max_Gain_Q16;
- SKP_int16 LPC_buf[ MAX_LPC_ORDER ];
- SKP_int16 CNG_sig[ MAX_FRAME_LENGTH ];
- SKP_Silk_CNG_struct *psCNG;
- psCNG = &psDec->sCNG;
-
- if( psDec->fs_kHz != psCNG->fs_kHz ) {
- /* Reset state */
- SKP_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 ] += SKP_SMULWB( psDec->prevNLSF_Q15[ i ] - 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 */
- SKP_memmove( &psCNG->CNG_exc_buf_Q10[ psDec->subfr_length ], psCNG->CNG_exc_buf_Q10, ( psDec->nb_subfr - 1 ) * psDec->subfr_length * sizeof( SKP_int32 ) );
- SKP_memcpy( psCNG->CNG_exc_buf_Q10, &psDec->exc_Q10[ subfr * psDec->subfr_length ], psDec->subfr_length * sizeof( SKP_int32 ) );
-
- /* Smooth gains */
- for( i = 0; i < psDec->nb_subfr; i++ ) {
- psCNG->CNG_smth_Gain_Q16 += SKP_SMULWB( psDecCtrl->Gains_Q16[ i ] - psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_Q16 );
- }
- }
-
- /* Add CNG when packet is lost and / or when low speech activity */
- if( psDec->lossCnt ) {
-
- /* Generate CNG excitation */
- SKP_Silk_CNG_exc( CNG_sig, psCNG->CNG_exc_buf_Q10,
- psCNG->CNG_smth_Gain_Q16, length, &psCNG->rand_seed );
-
- /* Convert CNG NLSF to filter representation */
- SKP_Silk_NLSF2A_stable( LPC_buf, psCNG->CNG_smth_NLSF_Q15, psDec->LPC_order );
-
- Gain_Q26 = ( SKP_int32 )1 << 26; /* 1.0 */
-
- /* Generate CNG signal, by synthesis filtering */
- if( psDec->LPC_order == 16 ) {
- SKP_Silk_LPC_synthesis_order16( CNG_sig, LPC_buf,
- Gain_Q26, psCNG->CNG_synth_state, CNG_sig, length );
- } else {
- SKP_Silk_LPC_synthesis_filter( CNG_sig, LPC_buf,
- Gain_Q26, psCNG->CNG_synth_state, CNG_sig, length, psDec->LPC_order );
- }
- /* Mix with signal */
- for( i = 0; i < length; i++ ) {
- tmp_32 = signal[ i ] + CNG_sig[ i ];
- signal[ i ] = SKP_SAT16( tmp_32 );
- }
- } else {
- SKP_memset( psCNG->CNG_synth_state, 0, psDec->LPC_order * sizeof( SKP_int32 ) );
- }
-}
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