580b307fd7
Sync opus codec to upstream commit
02fed471a4568852d6618e041c4f2af0d7730ee2 (August 30 2013)
This brings in a lot of optimizations but also makes the diff
between our codec and the upstream much smaller as most of our
optimizations have been upstreamed or supeceded.
Speedups across the board for CELT mode files:
64kbps 128kbps
H300 9.82MHz 15.48MHz
c200 4.86MHz 9.63MHz
fuze v1 10.32MHz 15.92MHz
For the silk mode test file (16kbps) arm targets get a speedup
of about 2MHz while the H300 is 7.8MHz slower, likely because it's
now using the pseudostack more rather than the real stack which
is in iram. Patches to get around that are upcomming.
Change-Id: Ifecf963e461c51ac42e09dac1e91bc4bc3b12fa3
142 lines
6.2 KiB
C
142 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, 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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/* NLSF stabilizer: */
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/* */
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/* - Moves NLSFs further apart if they are too close */
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/* - Moves NLSFs away from borders if they are too close */
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/* - High effort to achieve a modification with minimum */
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/* Euclidean distance to input vector */
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/* - Output are sorted NLSF coefficients */
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/* */
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#include "SigProc_FIX.h"
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/* Constant Definitions */
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#define MAX_LOOPS 20
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/* NLSF stabilizer, for a single input data vector */
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void silk_NLSF_stabilize(
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opus_int16 *NLSF_Q15, /* I/O Unstable/stabilized normalized LSF vector in Q15 [L] */
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const opus_int16 *NDeltaMin_Q15, /* I Min distance vector, NDeltaMin_Q15[L] must be >= 1 [L+1] */
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const opus_int L /* I Number of NLSF parameters in the input vector */
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)
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{
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opus_int i, I=0, k, loops;
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opus_int16 center_freq_Q15;
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opus_int32 diff_Q15, min_diff_Q15, min_center_Q15, max_center_Q15;
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/* This is necessary to ensure an output within range of a opus_int16 */
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silk_assert( NDeltaMin_Q15[L] >= 1 );
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for( loops = 0; loops < MAX_LOOPS; loops++ ) {
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/**************************/
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/* Find smallest distance */
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/**************************/
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/* First element */
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min_diff_Q15 = NLSF_Q15[0] - NDeltaMin_Q15[0];
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I = 0;
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/* Middle elements */
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for( i = 1; i <= L-1; i++ ) {
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diff_Q15 = NLSF_Q15[i] - ( NLSF_Q15[i-1] + NDeltaMin_Q15[i] );
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if( diff_Q15 < min_diff_Q15 ) {
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min_diff_Q15 = diff_Q15;
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I = i;
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}
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}
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/* Last element */
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diff_Q15 = ( 1 << 15 ) - ( NLSF_Q15[L-1] + NDeltaMin_Q15[L] );
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if( diff_Q15 < min_diff_Q15 ) {
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min_diff_Q15 = diff_Q15;
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I = L;
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}
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/***************************************************/
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/* Now check if the smallest distance non-negative */
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/***************************************************/
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if( min_diff_Q15 >= 0 ) {
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return;
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}
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if( I == 0 ) {
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/* Move away from lower limit */
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NLSF_Q15[0] = NDeltaMin_Q15[0];
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} else if( I == L) {
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/* Move away from higher limit */
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NLSF_Q15[L-1] = ( 1 << 15 ) - NDeltaMin_Q15[L];
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} else {
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/* Find the lower extreme for the location of the current center frequency */
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min_center_Q15 = 0;
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for( k = 0; k < I; k++ ) {
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min_center_Q15 += NDeltaMin_Q15[k];
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}
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min_center_Q15 += silk_RSHIFT( NDeltaMin_Q15[I], 1 );
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/* Find the upper extreme for the location of the current center frequency */
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max_center_Q15 = 1 << 15;
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for( k = L; k > I; k-- ) {
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max_center_Q15 -= NDeltaMin_Q15[k];
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}
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max_center_Q15 -= silk_RSHIFT( NDeltaMin_Q15[I], 1 );
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/* Move apart, sorted by value, keeping the same center frequency */
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center_freq_Q15 = (opus_int16)silk_LIMIT_32( silk_RSHIFT_ROUND( (opus_int32)NLSF_Q15[I-1] + (opus_int32)NLSF_Q15[I], 1 ),
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min_center_Q15, max_center_Q15 );
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NLSF_Q15[I-1] = center_freq_Q15 - silk_RSHIFT( NDeltaMin_Q15[I], 1 );
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NLSF_Q15[I] = NLSF_Q15[I-1] + NDeltaMin_Q15[I];
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}
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}
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/* Safe and simple fall back method, which is less ideal than the above */
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if( loops == MAX_LOOPS )
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{
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/* Insertion sort (fast for already almost sorted arrays): */
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/* Best case: O(n) for an already sorted array */
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/* Worst case: O(n^2) for an inversely sorted array */
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silk_insertion_sort_increasing_all_values_int16( &NLSF_Q15[0], L );
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/* First NLSF should be no less than NDeltaMin[0] */
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NLSF_Q15[0] = silk_max_int( NLSF_Q15[0], NDeltaMin_Q15[0] );
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/* Keep delta_min distance between the NLSFs */
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for( i = 1; i < L; i++ )
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NLSF_Q15[i] = silk_max_int( NLSF_Q15[i], NLSF_Q15[i-1] + NDeltaMin_Q15[i] );
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/* Last NLSF should be no higher than 1 - NDeltaMin[L] */
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NLSF_Q15[L-1] = silk_min_int( NLSF_Q15[L-1], (1<<15) - NDeltaMin_Q15[L] );
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/* Keep NDeltaMin distance between the NLSFs */
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for( i = L-2; i >= 0; i-- )
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NLSF_Q15[i] = silk_min_int( NLSF_Q15[i], NLSF_Q15[i+1] - NDeltaMin_Q15[i+1] );
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}
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}
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