mirror of
https://github.com/DrBeef/ioq3quest.git
synced 2024-11-23 20:42:30 +00:00
73 lines
3.3 KiB
C
73 lines
3.3 KiB
C
/***********************************************************************
|
|
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"
|
|
|
|
/* Quantize mid/side predictors */
|
|
void silk_stereo_quant_pred(
|
|
opus_int32 pred_Q13[], /* I/O Predictors (out: quantized) */
|
|
opus_int8 ix[ 2 ][ 3 ] /* O Quantization indices */
|
|
)
|
|
{
|
|
opus_int i, j, n;
|
|
opus_int32 low_Q13, step_Q13, lvl_Q13, err_min_Q13, err_Q13, quant_pred_Q13 = 0;
|
|
|
|
/* Quantize */
|
|
for( n = 0; n < 2; n++ ) {
|
|
/* Brute-force search over quantization levels */
|
|
err_min_Q13 = silk_int32_MAX;
|
|
for( i = 0; i < STEREO_QUANT_TAB_SIZE - 1; i++ ) {
|
|
low_Q13 = silk_stereo_pred_quant_Q13[ i ];
|
|
step_Q13 = silk_SMULWB( silk_stereo_pred_quant_Q13[ i + 1 ] - low_Q13,
|
|
SILK_FIX_CONST( 0.5 / STEREO_QUANT_SUB_STEPS, 16 ) );
|
|
for( j = 0; j < STEREO_QUANT_SUB_STEPS; j++ ) {
|
|
lvl_Q13 = silk_SMLABB( low_Q13, step_Q13, 2 * j + 1 );
|
|
err_Q13 = silk_abs( pred_Q13[ n ] - lvl_Q13 );
|
|
if( err_Q13 < err_min_Q13 ) {
|
|
err_min_Q13 = err_Q13;
|
|
quant_pred_Q13 = lvl_Q13;
|
|
ix[ n ][ 0 ] = i;
|
|
ix[ n ][ 1 ] = j;
|
|
} else {
|
|
/* Error increasing, so we're past the optimum */
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
ix[ n ][ 2 ] = silk_DIV32_16( ix[ n ][ 0 ], 3 );
|
|
ix[ n ][ 0 ] -= ix[ n ][ 2 ] * 3;
|
|
pred_Q13[ n ] = quant_pred_Q13;
|
|
}
|
|
|
|
/* Subtract second from first predictor (helps when actually applying these) */
|
|
pred_Q13[ 0 ] -= pred_Q13[ 1 ];
|
|
}
|