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comparison: media/libopus/silk/resampler_private_up2_HQ.c
media/libopus/silk/resampler_private_up2_HQ.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:ca42a9194ebc |
|---|---|
| 1 /*********************************************************************** | |
| 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. | |
| 3 Redistribution and use in source and binary forms, with or without | |
| 4 modification, are permitted provided that the following conditions | |
| 5 are met: | |
| 6 - Redistributions of source code must retain the above copyright notice, | |
| 7 this list of conditions and the following disclaimer. | |
| 8 - Redistributions in binary form must reproduce the above copyright | |
| 9 notice, this list of conditions and the following disclaimer in the | |
| 10 documentation and/or other materials provided with the distribution. | |
| 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the | |
| 12 names of specific contributors, may be used to endorse or promote | |
| 13 products derived from this software without specific prior written | |
| 14 permission. | |
| 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 POSSIBILITY OF SUCH DAMAGE. | |
| 26 ***********************************************************************/ | |
| 27 | |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include "config.h" | |
| 30 #endif | |
| 31 | |
| 32 #include "SigProc_FIX.h" | |
| 33 #include "resampler_private.h" | |
| 34 | |
| 35 /* Upsample by a factor 2, high quality */ | |
| 36 /* Uses 2nd order allpass filters for the 2x upsampling, followed by a */ | |
| 37 /* notch filter just above Nyquist. */ | |
| 38 void silk_resampler_private_up2_HQ( | |
| 39 opus_int32 *S, /* I/O Resampler state [ 6 ] */ | |
| 40 opus_int16 *out, /* O Output signal [ 2 * len ] */ | |
| 41 const opus_int16 *in, /* I Input signal [ len ] */ | |
| 42 opus_int32 len /* I Number of input samples */ | |
| 43 ) | |
| 44 { | |
| 45 opus_int32 k; | |
| 46 opus_int32 in32, out32_1, out32_2, Y, X; | |
| 47 | |
| 48 silk_assert( silk_resampler_up2_hq_0[ 0 ] > 0 ); | |
| 49 silk_assert( silk_resampler_up2_hq_0[ 1 ] > 0 ); | |
| 50 silk_assert( silk_resampler_up2_hq_0[ 2 ] < 0 ); | |
| 51 silk_assert( silk_resampler_up2_hq_1[ 0 ] > 0 ); | |
| 52 silk_assert( silk_resampler_up2_hq_1[ 1 ] > 0 ); | |
| 53 silk_assert( silk_resampler_up2_hq_1[ 2 ] < 0 ); | |
| 54 | |
| 55 /* Internal variables and state are in Q10 format */ | |
| 56 for( k = 0; k < len; k++ ) { | |
| 57 /* Convert to Q10 */ | |
| 58 in32 = silk_LSHIFT( (opus_int32)in[ k ], 10 ); | |
| 59 | |
| 60 /* First all-pass section for even output sample */ | |
| 61 Y = silk_SUB32( in32, S[ 0 ] ); | |
| 62 X = silk_SMULWB( Y, silk_resampler_up2_hq_0[ 0 ] ); | |
| 63 out32_1 = silk_ADD32( S[ 0 ], X ); | |
| 64 S[ 0 ] = silk_ADD32( in32, X ); | |
| 65 | |
| 66 /* Second all-pass section for even output sample */ | |
| 67 Y = silk_SUB32( out32_1, S[ 1 ] ); | |
| 68 X = silk_SMULWB( Y, silk_resampler_up2_hq_0[ 1 ] ); | |
| 69 out32_2 = silk_ADD32( S[ 1 ], X ); | |
| 70 S[ 1 ] = silk_ADD32( out32_1, X ); | |
| 71 | |
| 72 /* Third all-pass section for even output sample */ | |
| 73 Y = silk_SUB32( out32_2, S[ 2 ] ); | |
| 74 X = silk_SMLAWB( Y, Y, silk_resampler_up2_hq_0[ 2 ] ); | |
| 75 out32_1 = silk_ADD32( S[ 2 ], X ); | |
| 76 S[ 2 ] = silk_ADD32( out32_2, X ); | |
| 77 | |
| 78 /* Apply gain in Q15, convert back to int16 and store to output */ | |
| 79 out[ 2 * k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32_1, 10 ) ); | |
| 80 | |
| 81 /* First all-pass section for odd output sample */ | |
| 82 Y = silk_SUB32( in32, S[ 3 ] ); | |
| 83 X = silk_SMULWB( Y, silk_resampler_up2_hq_1[ 0 ] ); | |
| 84 out32_1 = silk_ADD32( S[ 3 ], X ); | |
| 85 S[ 3 ] = silk_ADD32( in32, X ); | |
| 86 | |
| 87 /* Second all-pass section for odd output sample */ | |
| 88 Y = silk_SUB32( out32_1, S[ 4 ] ); | |
| 89 X = silk_SMULWB( Y, silk_resampler_up2_hq_1[ 1 ] ); | |
| 90 out32_2 = silk_ADD32( S[ 4 ], X ); | |
| 91 S[ 4 ] = silk_ADD32( out32_1, X ); | |
| 92 | |
| 93 /* Third all-pass section for odd output sample */ | |
| 94 Y = silk_SUB32( out32_2, S[ 5 ] ); | |
| 95 X = silk_SMLAWB( Y, Y, silk_resampler_up2_hq_1[ 2 ] ); | |
| 96 out32_1 = silk_ADD32( S[ 5 ], X ); | |
| 97 S[ 5 ] = silk_ADD32( out32_2, X ); | |
| 98 | |
| 99 /* Apply gain in Q15, convert back to int16 and store to output */ | |
| 100 out[ 2 * k + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32_1, 10 ) ); | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 void silk_resampler_private_up2_HQ_wrapper( | |
| 105 void *SS, /* I/O Resampler state (unused) */ | |
| 106 opus_int16 *out, /* O Output signal [ 2 * len ] */ | |
| 107 const opus_int16 *in, /* I Input signal [ len ] */ | |
| 108 opus_int32 len /* I Number of input samples */ | |
| 109 ) | |
| 110 { | |
| 111 silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS; | |
| 112 silk_resampler_private_up2_HQ( S->sIIR, out, in, len ); | |
| 113 } |
