media/libopus/silk/resampler_private_IIR_FIR.c@6474c204b198 (annotated)
media/libopus/silk/resampler_private_IIR_FIR.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /*********************************************************************** |
| michael@0 | 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| michael@0 | 3 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 4 | modification, are permitted provided that the following conditions |
| michael@0 | 5 | are met: |
| michael@0 | 6 | - Redistributions of source code must retain the above copyright notice, |
| michael@0 | 7 | this list of conditions and the following disclaimer. |
| michael@0 | 8 | - Redistributions in binary form must reproduce the above copyright |
| michael@0 | 9 | notice, this list of conditions and the following disclaimer in the |
| michael@0 | 10 | documentation and/or other materials provided with the distribution. |
| michael@0 | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| michael@0 | 12 | names of specific contributors, may be used to endorse or promote |
| michael@0 | 13 | products derived from this software without specific prior written |
| michael@0 | 14 | permission. |
| michael@0 | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| michael@0 | 16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| michael@0 | 17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| michael@0 | 18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| michael@0 | 19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| michael@0 | 20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| michael@0 | 21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| michael@0 | 22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| michael@0 | 23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| michael@0 | 25 | POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 26 | ***********************************************************************/ |
| michael@0 | 27 | |
| michael@0 | 28 | #ifdef HAVE_CONFIG_H |
| michael@0 | 29 | #include "config.h" |
| michael@0 | 30 | #endif |
| michael@0 | 31 | |
| michael@0 | 32 | #include "SigProc_FIX.h" |
| michael@0 | 33 | #include "resampler_private.h" |
| michael@0 | 34 | #include "stack_alloc.h" |
| michael@0 | 35 | |
| michael@0 | 36 | static OPUS_INLINE opus_int16 *silk_resampler_private_IIR_FIR_INTERPOL( |
| michael@0 | 37 | opus_int16 *out, |
| michael@0 | 38 | opus_int16 *buf, |
| michael@0 | 39 | opus_int32 max_index_Q16, |
| michael@0 | 40 | opus_int32 index_increment_Q16 |
| michael@0 | 41 | ) |
| michael@0 | 42 | { |
| michael@0 | 43 | opus_int32 index_Q16, res_Q15; |
| michael@0 | 44 | opus_int16 *buf_ptr; |
| michael@0 | 45 | opus_int32 table_index; |
| michael@0 | 46 | |
| michael@0 | 47 | /* Interpolate upsampled signal and store in output array */ |
| michael@0 | 48 | for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) { |
| michael@0 | 49 | table_index = silk_SMULWB( index_Q16 & 0xFFFF, 12 ); |
| michael@0 | 50 | buf_ptr = &buf[ index_Q16 >> 16 ]; |
| michael@0 | 51 | |
| michael@0 | 52 | res_Q15 = silk_SMULBB( buf_ptr[ 0 ], silk_resampler_frac_FIR_12[ table_index ][ 0 ] ); |
| michael@0 | 53 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 1 ], silk_resampler_frac_FIR_12[ table_index ][ 1 ] ); |
| michael@0 | 54 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 2 ], silk_resampler_frac_FIR_12[ table_index ][ 2 ] ); |
| michael@0 | 55 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 3 ], silk_resampler_frac_FIR_12[ table_index ][ 3 ] ); |
| michael@0 | 56 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 4 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 3 ] ); |
| michael@0 | 57 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 5 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 2 ] ); |
| michael@0 | 58 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 6 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 1 ] ); |
| michael@0 | 59 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 7 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 0 ] ); |
| michael@0 | 60 | *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q15, 15 ) ); |
| michael@0 | 61 | } |
| michael@0 | 62 | return out; |
| michael@0 | 63 | } |
| michael@0 | 64 | /* Upsample using a combination of allpass-based 2x upsampling and FIR interpolation */ |
| michael@0 | 65 | void silk_resampler_private_IIR_FIR( |
| michael@0 | 66 | void *SS, /* I/O Resampler state */ |
| michael@0 | 67 | opus_int16 out[], /* O Output signal */ |
| michael@0 | 68 | const opus_int16 in[], /* I Input signal */ |
| michael@0 | 69 | opus_int32 inLen /* I Number of input samples */ |
| michael@0 | 70 | ) |
| michael@0 | 71 | { |
| michael@0 | 72 | silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS; |
| michael@0 | 73 | opus_int32 nSamplesIn; |
| michael@0 | 74 | opus_int32 max_index_Q16, index_increment_Q16; |
| michael@0 | 75 | VARDECL( opus_int16, buf ); |
| michael@0 | 76 | SAVE_STACK; |
| michael@0 | 77 | |
| michael@0 | 78 | ALLOC( buf, 2 * S->batchSize + RESAMPLER_ORDER_FIR_12, opus_int16 ); |
| michael@0 | 79 | |
| michael@0 | 80 | /* Copy buffered samples to start of buffer */ |
| michael@0 | 81 | silk_memcpy( buf, S->sFIR.i16, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); |
| michael@0 | 82 | |
| michael@0 | 83 | /* Iterate over blocks of frameSizeIn input samples */ |
| michael@0 | 84 | index_increment_Q16 = S->invRatio_Q16; |
| michael@0 | 85 | while( 1 ) { |
| michael@0 | 86 | nSamplesIn = silk_min( inLen, S->batchSize ); |
| michael@0 | 87 | |
| michael@0 | 88 | /* Upsample 2x */ |
| michael@0 | 89 | silk_resampler_private_up2_HQ( S->sIIR, &buf[ RESAMPLER_ORDER_FIR_12 ], in, nSamplesIn ); |
| michael@0 | 90 | |
| michael@0 | 91 | max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 + 1 ); /* + 1 because 2x upsampling */ |
| michael@0 | 92 | out = silk_resampler_private_IIR_FIR_INTERPOL( out, buf, max_index_Q16, index_increment_Q16 ); |
| michael@0 | 93 | in += nSamplesIn; |
| michael@0 | 94 | inLen -= nSamplesIn; |
| michael@0 | 95 | |
| michael@0 | 96 | if( inLen > 0 ) { |
| michael@0 | 97 | /* More iterations to do; copy last part of filtered signal to beginning of buffer */ |
| michael@0 | 98 | silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); |
| michael@0 | 99 | } else { |
| michael@0 | 100 | break; |
| michael@0 | 101 | } |
| michael@0 | 102 | } |
| michael@0 | 103 | |
| michael@0 | 104 | /* Copy last part of filtered signal to the state for the next call */ |
| michael@0 | 105 | silk_memcpy( S->sFIR.i16, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); |
| michael@0 | 106 | RESTORE_STACK; |
| michael@0 | 107 | } |
