diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/resampler_private_IIR_FIR.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/resampler_private_IIR_FIR.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/resampler_private_IIR_FIR.c b/lib/rbcodec/codecs/libopus/silk/resampler_private_IIR_FIR.c new file mode 100644 index 0000000000..105be35f16 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/resampler_private_IIR_FIR.c | |||
@@ -0,0 +1,103 @@ | |||
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 "opus_config.h" | ||
30 | #endif | ||
31 | |||
32 | #include "SigProc_FIX.h" | ||
33 | #include "resampler_private.h" | ||
34 | |||
35 | static inline opus_int16 *silk_resampler_private_IIR_FIR_INTERPOL( | ||
36 | opus_int16 *out, | ||
37 | opus_int16 *buf, | ||
38 | opus_int32 max_index_Q16, | ||
39 | opus_int32 index_increment_Q16 | ||
40 | ) | ||
41 | { | ||
42 | opus_int32 index_Q16, res_Q15; | ||
43 | opus_int16 *buf_ptr; | ||
44 | opus_int32 table_index; | ||
45 | |||
46 | /* Interpolate upsampled signal and store in output array */ | ||
47 | for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) { | ||
48 | table_index = silk_SMULWB( index_Q16 & 0xFFFF, 12 ); | ||
49 | buf_ptr = &buf[ index_Q16 >> 16 ]; | ||
50 | |||
51 | res_Q15 = silk_SMULBB( buf_ptr[ 0 ], silk_resampler_frac_FIR_12[ table_index ][ 0 ] ); | ||
52 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 1 ], silk_resampler_frac_FIR_12[ table_index ][ 1 ] ); | ||
53 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 2 ], silk_resampler_frac_FIR_12[ table_index ][ 2 ] ); | ||
54 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 3 ], silk_resampler_frac_FIR_12[ table_index ][ 3 ] ); | ||
55 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 4 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 3 ] ); | ||
56 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 5 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 2 ] ); | ||
57 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 6 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 1 ] ); | ||
58 | res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 7 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 0 ] ); | ||
59 | *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q15, 15 ) ); | ||
60 | } | ||
61 | return out; | ||
62 | } | ||
63 | /* Upsample using a combination of allpass-based 2x upsampling and FIR interpolation */ | ||
64 | void silk_resampler_private_IIR_FIR( | ||
65 | void *SS, /* I/O Resampler state */ | ||
66 | opus_int16 out[], /* O Output signal */ | ||
67 | const opus_int16 in[], /* I Input signal */ | ||
68 | opus_int32 inLen /* I Number of input samples */ | ||
69 | ) | ||
70 | { | ||
71 | silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS; | ||
72 | opus_int32 nSamplesIn; | ||
73 | opus_int32 max_index_Q16, index_increment_Q16; | ||
74 | opus_int16 buf[ RESAMPLER_MAX_BATCH_SIZE_IN + RESAMPLER_ORDER_FIR_12 ]; | ||
75 | |||
76 | /* Copy buffered samples to start of buffer */ | ||
77 | silk_memcpy( buf, S->sFIR, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int32 ) ); | ||
78 | |||
79 | /* Iterate over blocks of frameSizeIn input samples */ | ||
80 | index_increment_Q16 = S->invRatio_Q16; | ||
81 | while( 1 ) { | ||
82 | nSamplesIn = silk_min( inLen, S->batchSize ); | ||
83 | |||
84 | /* Upsample 2x */ | ||
85 | silk_resampler_private_up2_HQ( S->sIIR, &buf[ RESAMPLER_ORDER_FIR_12 ], in, nSamplesIn ); | ||
86 | |||
87 | max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 + 1 ); /* + 1 because 2x upsampling */ | ||
88 | out = silk_resampler_private_IIR_FIR_INTERPOL( out, buf, max_index_Q16, index_increment_Q16 ); | ||
89 | in += nSamplesIn; | ||
90 | inLen -= nSamplesIn; | ||
91 | |||
92 | if( inLen > 0 ) { | ||
93 | /* More iterations to do; copy last part of filtered signal to beginning of buffer */ | ||
94 | silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int32 ) ); | ||
95 | } else { | ||
96 | break; | ||
97 | } | ||
98 | } | ||
99 | |||
100 | /* Copy last part of filtered signal to the state for the next call */ | ||
101 | silk_memcpy( S->sFIR, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int32 ) ); | ||
102 | } | ||
103 | |||