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-rw-r--r--media/libopus/silk/decode_indices.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/media/libopus/silk/decode_indices.c b/media/libopus/silk/decode_indices.c
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+/***********************************************************************
+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"
+
+/* Decode side-information parameters from payload */
+void silk_decode_indices(
+ silk_decoder_state *psDec, /* I/O State */
+ ec_dec *psRangeDec, /* I/O Compressor data structure */
+ opus_int FrameIndex, /* I Frame number */
+ opus_int decode_LBRR, /* I Flag indicating LBRR data is being decoded */
+ opus_int condCoding /* I The type of conditional coding to use */
+)
+{
+ opus_int i, k, Ix;
+ opus_int decode_absolute_lagIndex, delta_lagIndex;
+ opus_int16 ec_ix[ MAX_LPC_ORDER ];
+ opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
+
+ /*******************************************/
+ /* Decode signal type and quantizer offset */
+ /*******************************************/
+ if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
+ Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
+ } else {
+ Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
+ }
+ psDec->indices.signalType = (opus_int8)silk_RSHIFT( Ix, 1 );
+ psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
+
+ /****************/
+ /* Decode gains */
+ /****************/
+ /* First subframe */
+ if( condCoding == CODE_CONDITIONALLY ) {
+ /* Conditional coding */
+ psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
+ } else {
+ /* Independent coding, in two stages: MSB bits followed by 3 LSBs */
+ psDec->indices.GainsIndices[ 0 ] = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
+ psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
+ }
+
+ /* Remaining subframes */
+ for( i = 1; i < psDec->nb_subfr; i++ ) {
+ psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
+ }
+
+ /**********************/
+ /* Decode LSF Indices */
+ /**********************/
+ psDec->indices.NLSFIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->CB1_iCDF[ ( psDec->indices.signalType >> 1 ) * psDec->psNLSF_CB->nVectors ], 8 );
+ silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
+ silk_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
+ for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
+ Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
+ if( Ix == 0 ) {
+ Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
+ } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
+ Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
+ }
+ psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
+ }
+
+ /* Decode LSF interpolation factor */
+ if( psDec->nb_subfr == MAX_NB_SUBFR ) {
+ psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
+ } else {
+ psDec->indices.NLSFInterpCoef_Q2 = 4;
+ }
+
+ if( psDec->indices.signalType == TYPE_VOICED )
+ {
+ /*********************/
+ /* Decode pitch lags */
+ /*********************/
+ /* Get lag index */
+ decode_absolute_lagIndex = 1;
+ if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
+ /* Decode Delta index */
+ delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
+ if( delta_lagIndex > 0 ) {
+ delta_lagIndex = delta_lagIndex - 9;
+ psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
+ decode_absolute_lagIndex = 0;
+ }
+ }
+ if( decode_absolute_lagIndex ) {
+ /* Absolute decoding */
+ psDec->indices.lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
+ psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
+ }
+ psDec->ec_prevLagIndex = psDec->indices.lagIndex;
+
+ /* Get countour index */
+ psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 );
+
+ /********************/
+ /* Decode LTP gains */
+ /********************/
+ /* Decode PERIndex value */
+ psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
+
+ for( k = 0; k < psDec->nb_subfr; k++ ) {
+ psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 );
+ }
+
+ /**********************/
+ /* Decode LTP scaling */
+ /**********************/
+ if( condCoding == CODE_INDEPENDENTLY ) {
+ psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
+ } else {
+ psDec->indices.LTP_scaleIndex = 0;
+ }
+ }
+ psDec->ec_prevSignalType = psDec->indices.signalType;
+
+ /***************/
+ /* Decode seed */
+ /***************/
+ psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 14:15:14 +0000