зеркало из https://github.com/mozilla/gecko-dev.git
112 строки
5.4 KiB
C
112 строки
5.4 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2012 IETF Trust and Skype Limited. All rights reserved.
|
|
|
|
This file is extracted from RFC6716. Please see that RFC for additional
|
|
information.
|
|
|
|
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"
|
|
|
|
void silk_quant_LTP_gains(
|
|
opus_int16 B_Q14[ MAX_NB_SUBFR * LTP_ORDER ], /* I/O (un)quantized LTP gains */
|
|
opus_int8 cbk_index[ MAX_NB_SUBFR ], /* O Codebook Index */
|
|
opus_int8 *periodicity_index, /* O Periodicity Index */
|
|
const opus_int32 W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Error Weights in Q18 */
|
|
opus_int mu_Q9, /* I Mu value (R/D tradeoff) */
|
|
opus_int lowComplexity, /* I Flag for low complexity */
|
|
const opus_int nb_subfr /* I number of subframes */
|
|
)
|
|
{
|
|
opus_int j, k, cbk_size;
|
|
opus_int8 temp_idx[ MAX_NB_SUBFR ];
|
|
const opus_uint8 *cl_ptr_Q5;
|
|
const opus_int8 *cbk_ptr_Q7;
|
|
const opus_int16 *b_Q14_ptr;
|
|
const opus_int32 *W_Q18_ptr;
|
|
opus_int32 rate_dist_Q14_subfr, rate_dist_Q14, min_rate_dist_Q14;
|
|
|
|
/***************************************************/
|
|
/* iterate over different codebooks with different */
|
|
/* rates/distortions, and choose best */
|
|
/***************************************************/
|
|
min_rate_dist_Q14 = silk_int32_MAX;
|
|
for( k = 0; k < 3; k++ ) {
|
|
cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ];
|
|
cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ];
|
|
cbk_size = silk_LTP_vq_sizes[ k ];
|
|
|
|
/* Set up pointer to first subframe */
|
|
W_Q18_ptr = W_Q18;
|
|
b_Q14_ptr = B_Q14;
|
|
|
|
rate_dist_Q14 = 0;
|
|
for( j = 0; j < nb_subfr; j++ ) {
|
|
silk_VQ_WMat_EC(
|
|
&temp_idx[ j ], /* O index of best codebook vector */
|
|
&rate_dist_Q14_subfr, /* O best weighted quantization error + mu * rate */
|
|
b_Q14_ptr, /* I input vector to be quantized */
|
|
W_Q18_ptr, /* I weighting matrix */
|
|
cbk_ptr_Q7, /* I codebook */
|
|
cl_ptr_Q5, /* I code length for each codebook vector */
|
|
mu_Q9, /* I tradeoff between weighted error and rate */
|
|
cbk_size /* I number of vectors in codebook */
|
|
);
|
|
|
|
rate_dist_Q14 = silk_ADD_POS_SAT32( rate_dist_Q14, rate_dist_Q14_subfr );
|
|
|
|
b_Q14_ptr += LTP_ORDER;
|
|
W_Q18_ptr += LTP_ORDER * LTP_ORDER;
|
|
}
|
|
|
|
/* Avoid never finding a codebook */
|
|
rate_dist_Q14 = silk_min( silk_int32_MAX - 1, rate_dist_Q14 );
|
|
|
|
if( rate_dist_Q14 < min_rate_dist_Q14 ) {
|
|
min_rate_dist_Q14 = rate_dist_Q14;
|
|
*periodicity_index = (opus_int8)k;
|
|
silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) );
|
|
}
|
|
|
|
/* Break early in low-complexity mode if rate distortion is below threshold */
|
|
if( lowComplexity && ( rate_dist_Q14 < silk_LTP_gain_middle_avg_RD_Q14 ) ) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ];
|
|
for( j = 0; j < nb_subfr; j++ ) {
|
|
for( k = 0; k < LTP_ORDER; k++ ) {
|
|
B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 );
|
|
}
|
|
}
|
|
}
|
|
|