diff options
Diffstat (limited to 'src/opus-1.0.2/silk/gain_quant.c')
| -rw-r--r-- | src/opus-1.0.2/silk/gain_quant.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/src/opus-1.0.2/silk/gain_quant.c b/src/opus-1.0.2/silk/gain_quant.c deleted file mode 100644 index b2f73735..00000000 --- a/src/opus-1.0.2/silk/gain_quant.c +++ /dev/null @@ -1,141 +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" - -#define OFFSET ( ( MIN_QGAIN_DB * 128 ) / 6 + 16 * 128 ) -#define SCALE_Q16 ( ( 65536 * ( N_LEVELS_QGAIN - 1 ) ) / ( ( ( MAX_QGAIN_DB - MIN_QGAIN_DB ) * 128 ) / 6 ) ) -#define INV_SCALE_Q16 ( ( 65536 * ( ( ( MAX_QGAIN_DB - MIN_QGAIN_DB ) * 128 ) / 6 ) ) / ( N_LEVELS_QGAIN - 1 ) ) - -/* Gain scalar quantization with hysteresis, uniform on log scale */ -void silk_gains_quant( - opus_int8 ind[ MAX_NB_SUBFR ], /* O gain indices */ - opus_int32 gain_Q16[ MAX_NB_SUBFR ], /* I/O gains (quantized out) */ - opus_int8 *prev_ind, /* I/O last index in previous frame */ - const opus_int conditional, /* I first gain is delta coded if 1 */ - const opus_int nb_subfr /* I number of subframes */ -) -{ - opus_int k, double_step_size_threshold; - - for( k = 0; k < nb_subfr; k++ ) { - /* Convert to log scale, scale, floor() */ - ind[ k ] = silk_SMULWB( SCALE_Q16, silk_lin2log( gain_Q16[ k ] ) - OFFSET ); - - /* Round towards previous quantized gain (hysteresis) */ - if( ind[ k ] < *prev_ind ) { - ind[ k ]++; - } - ind[ k ] = silk_LIMIT_int( ind[ k ], 0, N_LEVELS_QGAIN - 1 ); - - /* Compute delta indices and limit */ - if( k == 0 && conditional == 0 ) { - /* Full index */ - ind[ k ] = silk_LIMIT_int( ind[ k ], *prev_ind + MIN_DELTA_GAIN_QUANT, N_LEVELS_QGAIN - 1 ); - *prev_ind = ind[ k ]; - } else { - /* Delta index */ - ind[ k ] = ind[ k ] - *prev_ind; - - /* Double the quantization step size for large gain increases, so that the max gain level can be reached */ - double_step_size_threshold = 2 * MAX_DELTA_GAIN_QUANT - N_LEVELS_QGAIN + *prev_ind; - if( ind[ k ] > double_step_size_threshold ) { - ind[ k ] = double_step_size_threshold + silk_RSHIFT( ind[ k ] - double_step_size_threshold + 1, 1 ); - } - - ind[ k ] = silk_LIMIT_int( ind[ k ], MIN_DELTA_GAIN_QUANT, MAX_DELTA_GAIN_QUANT ); - - /* Accumulate deltas */ - if( ind[ k ] > double_step_size_threshold ) { - *prev_ind += silk_LSHIFT( ind[ k ], 1 ) - double_step_size_threshold; - } else { - *prev_ind += ind[ k ]; - } - - /* Shift to make non-negative */ - ind[ k ] -= MIN_DELTA_GAIN_QUANT; - } - - /* Scale and convert to linear scale */ - gain_Q16[ k ] = silk_log2lin( silk_min_32( silk_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) ); /* 3967 = 31 in Q7 */ - } -} - -/* Gains scalar dequantization, uniform on log scale */ -void silk_gains_dequant( - opus_int32 gain_Q16[ MAX_NB_SUBFR ], /* O quantized gains */ - const opus_int8 ind[ MAX_NB_SUBFR ], /* I gain indices */ - opus_int8 *prev_ind, /* I/O last index in previous frame */ - const opus_int conditional, /* I first gain is delta coded if 1 */ - const opus_int nb_subfr /* I number of subframes */ -) -{ - opus_int k, ind_tmp, double_step_size_threshold; - - for( k = 0; k < nb_subfr; k++ ) { - if( k == 0 && conditional == 0 ) { - /* Gain index is not allowed to go down more than 16 steps (~21.8 dB) */ - *prev_ind = silk_max_int( ind[ k ], *prev_ind - 16 ); - } else { - /* Delta index */ - ind_tmp = ind[ k ] + MIN_DELTA_GAIN_QUANT; - - /* Accumulate deltas */ - double_step_size_threshold = 2 * MAX_DELTA_GAIN_QUANT - N_LEVELS_QGAIN + *prev_ind; - if( ind_tmp > double_step_size_threshold ) { - *prev_ind += silk_LSHIFT( ind_tmp, 1 ) - double_step_size_threshold; - } else { - *prev_ind += ind_tmp; - } - } - *prev_ind = silk_LIMIT_int( *prev_ind, 0, N_LEVELS_QGAIN - 1 ); - - /* Scale and convert to linear scale */ - gain_Q16[ k ] = silk_log2lin( silk_min_32( silk_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) ); /* 3967 = 31 in Q7 */ - } -} - -/* Compute unique identifier of gain indices vector */ -opus_int32 silk_gains_ID( /* O returns unique identifier of gains */ - const opus_int8 ind[ MAX_NB_SUBFR ], /* I gain indices */ - const opus_int nb_subfr /* I number of subframes */ -) -{ - opus_int k; - opus_int32 gainsID; - - gainsID = 0; - for( k = 0; k < nb_subfr; k++ ) { - gainsID = silk_ADD_LSHIFT32( ind[ k ], gainsID, 8 ); - } - - return gainsID; -} |