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Diffstat (limited to 'src/opus-1.0.2/silk/stereo_find_predictor.c')
| -rw-r--r-- | src/opus-1.0.2/silk/stereo_find_predictor.c | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/src/opus-1.0.2/silk/stereo_find_predictor.c b/src/opus-1.0.2/silk/stereo_find_predictor.c deleted file mode 100644 index aec58dab..00000000 --- a/src/opus-1.0.2/silk/stereo_find_predictor.c +++ /dev/null @@ -1,79 +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" - -/* Find least-squares prediction gain for one signal based on another and quantize it */ -opus_int32 silk_stereo_find_predictor( /* O Returns predictor in Q13 */ - opus_int32 *ratio_Q14, /* O Ratio of residual and mid energies */ - const opus_int16 x[], /* I Basis signal */ - const opus_int16 y[], /* I Target signal */ - opus_int32 mid_res_amp_Q0[], /* I/O Smoothed mid, residual norms */ - opus_int length, /* I Number of samples */ - opus_int smooth_coef_Q16 /* I Smoothing coefficient */ -) -{ - opus_int scale, scale1, scale2; - opus_int32 nrgx, nrgy, corr, pred_Q13, pred2_Q10; - - /* Find predictor */ - silk_sum_sqr_shift( &nrgx, &scale1, x, length ); - silk_sum_sqr_shift( &nrgy, &scale2, y, length ); - scale = silk_max_int( scale1, scale2 ); - scale = scale + ( scale & 1 ); /* make even */ - nrgy = silk_RSHIFT32( nrgy, scale - scale2 ); - nrgx = silk_RSHIFT32( nrgx, scale - scale1 ); - nrgx = silk_max_int( nrgx, 1 ); - corr = silk_inner_prod_aligned_scale( x, y, scale, length ); - pred_Q13 = silk_DIV32_varQ( corr, nrgx, 13 ); - pred_Q13 = silk_LIMIT( pred_Q13, -(1 << 14), 1 << 14 ); - pred2_Q10 = silk_SMULWB( pred_Q13, pred_Q13 ); - - /* Faster update for signals with large prediction parameters */ - smooth_coef_Q16 = (opus_int)silk_max_int( smooth_coef_Q16, silk_abs( pred2_Q10 ) ); - - /* Smoothed mid and residual norms */ - silk_assert( smooth_coef_Q16 < 32768 ); - scale = silk_RSHIFT( scale, 1 ); - mid_res_amp_Q0[ 0 ] = silk_SMLAWB( mid_res_amp_Q0[ 0 ], silk_LSHIFT( silk_SQRT_APPROX( nrgx ), scale ) - mid_res_amp_Q0[ 0 ], - smooth_coef_Q16 ); - /* Residual energy = nrgy - 2 * pred * corr + pred^2 * nrgx */ - nrgy = silk_SUB_LSHIFT32( nrgy, silk_SMULWB( corr, pred_Q13 ), 3 + 1 ); - nrgy = silk_ADD_LSHIFT32( nrgy, silk_SMULWB( nrgx, pred2_Q10 ), 6 ); - mid_res_amp_Q0[ 1 ] = silk_SMLAWB( mid_res_amp_Q0[ 1 ], silk_LSHIFT( silk_SQRT_APPROX( nrgy ), scale ) - mid_res_amp_Q0[ 1 ], - smooth_coef_Q16 ); - - /* Ratio of smoothed residual and mid norms */ - *ratio_Q14 = silk_DIV32_varQ( mid_res_amp_Q0[ 1 ], silk_max( mid_res_amp_Q0[ 0 ], 1 ), 14 ); - *ratio_Q14 = silk_LIMIT( *ratio_Q14, 0, 32767 ); - - return pred_Q13; -} |