diff options
Diffstat (limited to 'drivers/opus/silk/float/apply_sine_window_FLP.c')
| -rw-r--r-- | drivers/opus/silk/float/apply_sine_window_FLP.c | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/drivers/opus/silk/float/apply_sine_window_FLP.c b/drivers/opus/silk/float/apply_sine_window_FLP.c deleted file mode 100644 index 0d9c894cd8..0000000000 --- a/drivers/opus/silk/float/apply_sine_window_FLP.c +++ /dev/null @@ -1,78 +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. -***********************************************************************/ -#include "opus/opus_config.h" - -#include "opus/silk/float/main_FLP.h" - -/* Apply sine window to signal vector */ -/* Window types: */ -/* 1 -> sine window from 0 to pi/2 */ -/* 2 -> sine window from pi/2 to pi */ -void silk_apply_sine_window_FLP( - silk_float px_win[], /* O Pointer to windowed signal */ - const silk_float px[], /* I Pointer to input signal */ - const opus_int win_type, /* I Selects a window type */ - const opus_int length /* I Window length, multiple of 4 */ -) -{ - opus_int k; - silk_float freq, c, S0, S1; - - silk_assert( win_type == 1 || win_type == 2 ); - - /* Length must be multiple of 4 */ - silk_assert( ( length & 3 ) == 0 ); - - freq = PI / ( length + 1 ); - - /* Approximation of 2 * cos(f) */ - c = 2.0f - freq * freq; - - /* Initialize state */ - if( win_type < 2 ) { - /* Start from 0 */ - S0 = 0.0f; - /* Approximation of sin(f) */ - S1 = freq; - } else { - /* Start from 1 */ - S0 = 1.0f; - /* Approximation of cos(f) */ - S1 = 0.5f * c; - } - - /* Uses the recursive equation: sin(n*f) = 2 * cos(f) * sin((n-1)*f) - sin((n-2)*f) */ - /* 4 samples at a time */ - for( k = 0; k < length; k += 4 ) { - px_win[ k + 0 ] = px[ k + 0 ] * 0.5f * ( S0 + S1 ); - px_win[ k + 1 ] = px[ k + 1 ] * S1; - S0 = c * S1 - S0; - px_win[ k + 2 ] = px[ k + 2 ] * 0.5f * ( S1 + S0 ); - px_win[ k + 3 ] = px[ k + 3 ] * S0; - S1 = c * S0 - S1; - } -} |