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author | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2011-09-16 01:16:53 -0700 |
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committer | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2011-09-16 01:16:53 -0700 |
commit | 1c2f5633d101c08b5ef8095a8682d3d52cbd952d (patch) | |
tree | 66f80e67f075db5fa5233759a89f475d8bedade2 /silk/resampler_private_up2_HQ.c | |
parent | fb3a437c9dabb4aafe4a3927158161590ed745ab (diff) | |
download | opus-1c2f5633d101c08b5ef8095a8682d3d52cbd952d.tar.gz |
Removed all the silk_ prefixes in source file names (not symbols)
Diffstat (limited to 'silk/resampler_private_up2_HQ.c')
-rw-r--r-- | silk/resampler_private_up2_HQ.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/silk/resampler_private_up2_HQ.c b/silk/resampler_private_up2_HQ.c new file mode 100644 index 00000000..e02ee5e6 --- /dev/null +++ b/silk/resampler_private_up2_HQ.c @@ -0,0 +1,113 @@ +/*********************************************************************** +Copyright (c) 2006-2011, Skype Limited. All rights reserved. +Redistribution and use in source and binary forms, with or without +modification, (subject to the limitations in the disclaimer below) +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 Skype Limited, nor the names of specific +contributors, may be used to endorse or promote products derived from +this software without specific prior written permission. +NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED +BY THIS LICENSE. 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 "SigProc_FIX.h" +#include "resampler_private.h" + +/* Upsample by a factor 2, high quality */ +/* Uses 2nd order allpass filters for the 2x upsampling, followed by a */ +/* notch filter just above Nyquist. */ +void silk_resampler_private_up2_HQ( + opus_int32 *S, /* I/O: Resampler state [ 6 ] */ + opus_int16 *out, /* O: Output signal [ 2 * len ] */ + const opus_int16 *in, /* I: Input signal [ len ] */ + opus_int32 len /* I: Number of INPUT samples */ +) +{ + opus_int32 k; + opus_int32 in32, out32_1, out32_2, Y, X; + + silk_assert( silk_resampler_up2_hq_0[ 0 ] > 0 ); + silk_assert( silk_resampler_up2_hq_0[ 1 ] < 0 ); + silk_assert( silk_resampler_up2_hq_1[ 0 ] > 0 ); + silk_assert( silk_resampler_up2_hq_1[ 1 ] < 0 ); + + /* Internal variables and state are in Q10 format */ + for( k = 0; k < len; k++ ) { + /* Convert to Q10 */ + in32 = silk_LSHIFT( (opus_int32)in[ k ], 10 ); + + /* First all-pass section for even output sample */ + Y = silk_SUB32( in32, S[ 0 ] ); + X = silk_SMULWB( Y, silk_resampler_up2_hq_0[ 0 ] ); + out32_1 = silk_ADD32( S[ 0 ], X ); + S[ 0 ] = silk_ADD32( in32, X ); + + /* Second all-pass section for even output sample */ + Y = silk_SUB32( out32_1, S[ 1 ] ); + X = silk_SMLAWB( Y, Y, silk_resampler_up2_hq_0[ 1 ] ); + out32_2 = silk_ADD32( S[ 1 ], X ); + S[ 1 ] = silk_ADD32( out32_1, X ); + + /* Biquad notch filter */ + out32_2 = silk_SMLAWB( out32_2, S[ 5 ], silk_resampler_up2_hq_notch[ 2 ] ); + out32_2 = silk_SMLAWB( out32_2, S[ 4 ], silk_resampler_up2_hq_notch[ 1 ] ); + out32_1 = silk_SMLAWB( out32_2, S[ 4 ], silk_resampler_up2_hq_notch[ 0 ] ); + S[ 5 ] = silk_SUB32( out32_2, S[ 5 ] ); + + /* Apply gain in Q15, convert back to int16 and store to output */ + out[ 2 * k ] = (opus_int16)silk_SAT16( silk_RSHIFT32( + silk_SMLAWB( 256, out32_1, silk_resampler_up2_hq_notch[ 3 ] ), 9 ) ); + + /* First all-pass section for odd output sample */ + Y = silk_SUB32( in32, S[ 2 ] ); + X = silk_SMULWB( Y, silk_resampler_up2_hq_1[ 0 ] ); + out32_1 = silk_ADD32( S[ 2 ], X ); + S[ 2 ] = silk_ADD32( in32, X ); + + /* Second all-pass section for odd output sample */ + Y = silk_SUB32( out32_1, S[ 3 ] ); + X = silk_SMLAWB( Y, Y, silk_resampler_up2_hq_1[ 1 ] ); + out32_2 = silk_ADD32( S[ 3 ], X ); + S[ 3 ] = silk_ADD32( out32_1, X ); + + /* Biquad notch filter */ + out32_2 = silk_SMLAWB( out32_2, S[ 4 ], silk_resampler_up2_hq_notch[ 2 ] ); + out32_2 = silk_SMLAWB( out32_2, S[ 5 ], silk_resampler_up2_hq_notch[ 1 ] ); + out32_1 = silk_SMLAWB( out32_2, S[ 5 ], silk_resampler_up2_hq_notch[ 0 ] ); + S[ 4 ] = silk_SUB32( out32_2, S[ 4 ] ); + + /* Apply gain in Q15, convert back to int16 and store to output */ + out[ 2 * k + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT32( + silk_SMLAWB( 256, out32_1, silk_resampler_up2_hq_notch[ 3 ] ), 9 ) ); + } +} + +void silk_resampler_private_up2_HQ_wrapper( + void *SS, /* I/O: Resampler state (unused) */ + opus_int16 *out, /* O: Output signal [ 2 * len ] */ + const opus_int16 *in, /* I: Input signal [ len ] */ + opus_int32 len /* I: Number of input samples */ +) +{ + silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS; + silk_resampler_private_up2_HQ( S->sIIR, out, in, len ); +} |