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46ae64cd60
This reverts commit e00426c512.
The way we handle platform-specific intrinsics is not good, so the
current state will not compile on armv8. This commit also requires
SSE4.1 support, which is likely not a good idea for portable binaries.
We'll have to redo this with more caution after 3.2 is released, or
we might simply drop opus as we're only using it as dependency for
theora right now.
Fixes #33606.
142 lines
6.7 KiB
C
142 lines
6.7 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, 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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#include "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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opus_int8 ind[ MAX_NB_SUBFR ], /* O gain indices */
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opus_int32 gain_Q16[ MAX_NB_SUBFR ], /* I/O gains (quantized out) */
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opus_int8 *prev_ind, /* I/O last index in previous frame */
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const opus_int conditional, /* I first gain is delta coded if 1 */
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const opus_int nb_subfr /* I number of subframes */
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)
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{
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opus_int k, double_step_size_threshold;
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for( k = 0; k < nb_subfr; k++ ) {
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/* Convert to log scale, scale, floor() */
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ind[ k ] = silk_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 ] = silk_LIMIT_int( ind[ k ], 0, N_LEVELS_QGAIN - 1 );
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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 ] = silk_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 + silk_RSHIFT( ind[ k ] - double_step_size_threshold + 1, 1 );
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}
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ind[ k ] = silk_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 += silk_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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/* Scale and convert to linear scale */
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gain_Q16[ k ] = silk_log2lin( silk_min_32( silk_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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opus_int32 gain_Q16[ MAX_NB_SUBFR ], /* O quantized gains */
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const opus_int8 ind[ MAX_NB_SUBFR ], /* I gain indices */
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opus_int8 *prev_ind, /* I/O last index in previous frame */
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const opus_int conditional, /* I first gain is delta coded if 1 */
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const opus_int nb_subfr /* I number of subframes */
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)
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{
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opus_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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/* Gain index is not allowed to go down more than 16 steps (~21.8 dB) */
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*prev_ind = silk_max_int( ind[ k ], *prev_ind - 16 );
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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 += silk_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 = silk_LIMIT_int( *prev_ind, 0, N_LEVELS_QGAIN - 1 );
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/* Scale and convert to linear scale */
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gain_Q16[ k ] = silk_log2lin( silk_min_32( silk_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) ); /* 3967 = 31 in Q7 */
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}
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}
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/* Compute unique identifier of gain indices vector */
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opus_int32 silk_gains_ID( /* O returns unique identifier of gains */
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const opus_int8 ind[ MAX_NB_SUBFR ], /* I gain indices */
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const opus_int nb_subfr /* I number of subframes */
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)
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{
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opus_int k;
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opus_int32 gainsID;
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gainsID = 0;
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for( k = 0; k < nb_subfr; k++ ) {
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gainsID = silk_ADD_LSHIFT32( ind[ k ], gainsID, 8 );
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}
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return gainsID;
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}
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