103302b375
commit 5b64cf7c4d67af9050bc959996ef976ce6326888
Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
Date: Thu May 19 16:40:35 2011 -0400
Fixes a few bugs introduced in the latest update
commit b91eb86025d2de3c4cf04f4fb1aa48a28ad676a3
Author: Timothy B. Terriberry <tterribe@xiph.org>
Date: Thu May 19 16:12:02 2011 -0400
build_draft.sh fixes
commit 0b10c30db7ad60ff7d4bfc1139bdb86e0543c035
Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
Date: Thu May 19 15:30:21 2011 -0400
Fixes the draft build
commit 164424cded5978e657105104e171ac202dde5e5b
Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
Date: Thu May 19 15:00:23 2011 -0400
Updated build system
commit 188d9fcba8c3a1b1ad67c67c430e1b37e3658a40
Author: Koen Vos <koen.vos@skype.net>
Date: Thu May 19 17:14:57 2011 -0400
SILK/Opus update
119 lines
6.2 KiB
C
119 lines
6.2 KiB
C
/***********************************************************************
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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, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions 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 Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#include "silk_main.h"
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#define OFFSET ( ( MIN_QGAIN_DB * 128 ) / 6 + 16 * 128 )
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#define SCALE_Q16 ( ( 65536 * ( N_LEVELS_QGAIN - 1 ) ) / ( ( ( MAX_QGAIN_DB - MIN_QGAIN_DB ) * 128 ) / 6 ) )
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#define INV_SCALE_Q16 ( ( 65536 * ( ( ( MAX_QGAIN_DB - MIN_QGAIN_DB ) * 128 ) / 6 ) ) / ( N_LEVELS_QGAIN - 1 ) )
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/* Gain scalar quantization with hysteresis, uniform on log scale */
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void silk_gains_quant(
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SKP_int8 ind[ MAX_NB_SUBFR ], /* O gain indices */
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SKP_int32 gain_Q16[ MAX_NB_SUBFR ], /* I/O gains (quantized out) */
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SKP_int8 *prev_ind, /* I/O last index in previous frame */
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const SKP_int conditional, /* I first gain is delta coded if 1 */
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const SKP_int nb_subfr /* I number of subframes */
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)
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{
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SKP_int k, double_step_size_threshold;
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for( k = 0; k < nb_subfr; k++ ) {
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/* Add half of previous quantization error, convert to log scale, scale, floor() */
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ind[ k ] = SKP_SMULWB( SCALE_Q16, silk_lin2log( gain_Q16[ k ] ) - OFFSET );
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/* Round towards previous quantized gain (hysteresis) */
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if( ind[ k ] < *prev_ind ) {
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ind[ k ]++;
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}
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ind[ k ] = SKP_max_int( ind[ k ], 0 );
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/* Compute delta indices and limit */
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if( k == 0 && conditional == 0 ) {
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/* Full index */
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ind[ k ] = SKP_LIMIT_int( ind[ k ], *prev_ind + MIN_DELTA_GAIN_QUANT, N_LEVELS_QGAIN - 1 );
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*prev_ind = ind[ k ];
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} else {
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/* Delta index */
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ind[ k ] = ind[ k ] - *prev_ind;
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/* Double the quantization step size for large gain increases, so that the max gain level can be reached */
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double_step_size_threshold = 2 * MAX_DELTA_GAIN_QUANT - N_LEVELS_QGAIN + *prev_ind;
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if( ind[ k ] > double_step_size_threshold ) {
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ind[ k ] = double_step_size_threshold + SKP_RSHIFT( ind[ k ] - double_step_size_threshold + 1, 1 );
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}
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ind[ k ] = SKP_LIMIT_int( ind[ k ], MIN_DELTA_GAIN_QUANT, MAX_DELTA_GAIN_QUANT );
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/* Accumulate deltas */
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if( ind[ k ] > double_step_size_threshold ) {
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*prev_ind += SKP_LSHIFT( ind[ k ], 1 ) - double_step_size_threshold;
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} else {
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*prev_ind += ind[ k ];
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}
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/* Shift to make non-negative */
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ind[ k ] -= MIN_DELTA_GAIN_QUANT;
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}
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/* Convert to linear scale and scale */
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gain_Q16[ k ] = silk_log2lin( SKP_min_32( SKP_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) ); /* 3967 = 31 in Q7 */
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}
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}
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/* Gains scalar dequantization, uniform on log scale */
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void silk_gains_dequant(
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SKP_int32 gain_Q16[ MAX_NB_SUBFR ], /* O quantized gains */
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const SKP_int8 ind[ MAX_NB_SUBFR ], /* I gain indices */
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SKP_int8 *prev_ind, /* I/O last index in previous frame */
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const SKP_int conditional, /* I first gain is delta coded if 1 */
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const SKP_int nb_subfr /* I number of subframes */
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)
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{
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SKP_int k, ind_tmp, double_step_size_threshold;
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for( k = 0; k < nb_subfr; k++ ) {
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if( k == 0 && conditional == 0 ) {
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*prev_ind = ind[ k ];
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} else {
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/* Delta index */
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ind_tmp = ind[ k ] + MIN_DELTA_GAIN_QUANT;
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/* Accumulate deltas */
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double_step_size_threshold = 2 * MAX_DELTA_GAIN_QUANT - N_LEVELS_QGAIN + *prev_ind;
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if( ind_tmp > double_step_size_threshold ) {
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*prev_ind += SKP_LSHIFT( ind_tmp, 1 ) - double_step_size_threshold;
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} else {
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*prev_ind += ind_tmp;
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}
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}
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*prev_ind = SKP_min( *prev_ind, N_LEVELS_QGAIN - 1 );
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/* Convert to linear scale and scale */
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gain_Q16[ k ] = silk_log2lin( SKP_min_32( SKP_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) ); /* 3967 = 31 in Q7 */
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}
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}
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