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comparison: media/libopus/silk/resampler_private_IIR_FIR.c
media/libopus/silk/resampler_private_IIR_FIR.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:e3c0a282dc4d |
|---|---|
| 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 #include "stack_alloc.h" | |
| 35 | |
| 36 static OPUS_INLINE opus_int16 *silk_resampler_private_IIR_FIR_INTERPOL( | |
| 37 opus_int16 *out, | |
| 38 opus_int16 *buf, | |
| 39 opus_int32 max_index_Q16, | |
| 40 opus_int32 index_increment_Q16 | |
| 41 ) | |
| 42 { | |
| 43 opus_int32 index_Q16, res_Q15; | |
| 44 opus_int16 *buf_ptr; | |
| 45 opus_int32 table_index; | |
| 46 | |
| 47 /* Interpolate upsampled signal and store in output array */ | |
| 48 for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) { | |
| 49 table_index = silk_SMULWB( index_Q16 & 0xFFFF, 12 ); | |
| 50 buf_ptr = &buf[ index_Q16 >> 16 ]; | |
| 51 | |
| 52 res_Q15 = silk_SMULBB( buf_ptr[ 0 ], silk_resampler_frac_FIR_12[ table_index ][ 0 ] ); | |
| 53 res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 1 ], silk_resampler_frac_FIR_12[ table_index ][ 1 ] ); | |
| 54 res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 2 ], silk_resampler_frac_FIR_12[ table_index ][ 2 ] ); | |
| 55 res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 3 ], silk_resampler_frac_FIR_12[ table_index ][ 3 ] ); | |
| 56 res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 4 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 3 ] ); | |
| 57 res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 5 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 2 ] ); | |
| 58 res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 6 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 1 ] ); | |
| 59 res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 7 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 0 ] ); | |
| 60 *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q15, 15 ) ); | |
| 61 } | |
| 62 return out; | |
| 63 } | |
| 64 /* Upsample using a combination of allpass-based 2x upsampling and FIR interpolation */ | |
| 65 void silk_resampler_private_IIR_FIR( | |
| 66 void *SS, /* I/O Resampler state */ | |
| 67 opus_int16 out[], /* O Output signal */ | |
| 68 const opus_int16 in[], /* I Input signal */ | |
| 69 opus_int32 inLen /* I Number of input samples */ | |
| 70 ) | |
| 71 { | |
| 72 silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS; | |
| 73 opus_int32 nSamplesIn; | |
| 74 opus_int32 max_index_Q16, index_increment_Q16; | |
| 75 VARDECL( opus_int16, buf ); | |
| 76 SAVE_STACK; | |
| 77 | |
| 78 ALLOC( buf, 2 * S->batchSize + RESAMPLER_ORDER_FIR_12, opus_int16 ); | |
| 79 | |
| 80 /* Copy buffered samples to start of buffer */ | |
| 81 silk_memcpy( buf, S->sFIR.i16, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); | |
| 82 | |
| 83 /* Iterate over blocks of frameSizeIn input samples */ | |
| 84 index_increment_Q16 = S->invRatio_Q16; | |
| 85 while( 1 ) { | |
| 86 nSamplesIn = silk_min( inLen, S->batchSize ); | |
| 87 | |
| 88 /* Upsample 2x */ | |
| 89 silk_resampler_private_up2_HQ( S->sIIR, &buf[ RESAMPLER_ORDER_FIR_12 ], in, nSamplesIn ); | |
| 90 | |
| 91 max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 + 1 ); /* + 1 because 2x upsampling */ | |
| 92 out = silk_resampler_private_IIR_FIR_INTERPOL( out, buf, max_index_Q16, index_increment_Q16 ); | |
| 93 in += nSamplesIn; | |
| 94 inLen -= nSamplesIn; | |
| 95 | |
| 96 if( inLen > 0 ) { | |
| 97 /* More iterations to do; copy last part of filtered signal to beginning of buffer */ | |
| 98 silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); | |
| 99 } else { | |
| 100 break; | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 /* Copy last part of filtered signal to the state for the next call */ | |
| 105 silk_memcpy( S->sFIR.i16, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); | |
| 106 RESTORE_STACK; | |
| 107 } |
