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1 /*********************************************************************** | 1 /*********************************************************************** |
2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. | 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
3 Redistribution and use in source and binary forms, with or without | 3 Redistribution and use in source and binary forms, with or without |
4 modification, are permitted provided that the following conditions | 4 modification, are permitted provided that the following conditions |
5 are met: | 5 are met: |
6 - Redistributions of source code must retain the above copyright notice, | 6 - Redistributions of source code must retain the above copyright notice, |
7 this list of conditions and the following disclaimer. | 7 this list of conditions and the following disclaimer. |
8 - Redistributions in binary form must reproduce the above copyright | 8 - Redistributions in binary form must reproduce the above copyright |
9 notice, this list of conditions and the following disclaimer in the | 9 notice, this list of conditions and the following disclaimer in the |
10 documentation and/or other materials provided with the distribution. | 10 documentation and/or other materials provided with the distribution. |
11 - Neither the name of Internet Society, IETF or IETF Trust, nor the | 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 | 12 names of specific contributors, may be used to endorse or promote |
13 products derived from this software without specific prior written | 13 products derived from this software without specific prior written |
14 permission. | 14 permission. |
15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” | 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 | 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | 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 | 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | 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 | 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
25 POSSIBILITY OF SUCH DAMAGE. | 25 POSSIBILITY OF SUCH DAMAGE. |
26 ***********************************************************************/ | 26 ***********************************************************************/ |
27 | 27 |
28 #ifdef HAVE_CONFIG_H | 28 #ifdef HAVE_CONFIG_H |
29 #include "config.h" | 29 #include "config.h" |
30 #endif | 30 #endif |
31 | 31 |
32 #include "SigProc_FIX.h" | 32 #include "SigProc_FIX.h" |
33 #include "resampler_rom.h" | 33 #include "resampler_rom.h" |
34 | 34 |
35 /* Downsample by a factor 2 */ | 35 /* Downsample by a factor 2 */ |
36 void silk_resampler_down2( | 36 void silk_resampler_down2( |
37 opus_int32 *S, /* I/O State vector [ 2 ]
*/ | 37 opus_int32 *S, /* I/O State vector [ 2 ]
*/ |
38 opus_int16 *out, /* O Output signal [ len
] */ | 38 opus_int16 *out, /* O Output signal [ floo
r(len/2) ] */ |
39 const opus_int16 *in, /* I Input signal [ floor
(len/2) ] */ | 39 const opus_int16 *in, /* I Input signal [ len ]
*/ |
40 opus_int32 inLen /* I Number of input samp
les */ | 40 opus_int32 inLen /* I Number of input samp
les */ |
41 ) | 41 ) |
42 { | 42 { |
43 opus_int32 k, len2 = silk_RSHIFT32( inLen, 1 ); | 43 opus_int32 k, len2 = silk_RSHIFT32( inLen, 1 ); |
44 opus_int32 in32, out32, Y, X; | 44 opus_int32 in32, out32, Y, X; |
45 | 45 |
46 silk_assert( silk_resampler_down2_0 > 0 ); | 46 silk_assert( silk_resampler_down2_0 > 0 ); |
47 silk_assert( silk_resampler_down2_1 < 0 ); | 47 silk_assert( silk_resampler_down2_1 < 0 ); |
48 | 48 |
49 /* Internal variables and state are in Q10 format */ | 49 /* Internal variables and state are in Q10 format */ |
(...skipping 15 matching lines...) Expand all Loading... |
65 X = silk_SMULWB( Y, silk_resampler_down2_0 ); | 65 X = silk_SMULWB( Y, silk_resampler_down2_0 ); |
66 out32 = silk_ADD32( out32, S[ 1 ] ); | 66 out32 = silk_ADD32( out32, S[ 1 ] ); |
67 out32 = silk_ADD32( out32, X ); | 67 out32 = silk_ADD32( out32, X ); |
68 S[ 1 ] = silk_ADD32( in32, X ); | 68 S[ 1 ] = silk_ADD32( in32, X ); |
69 | 69 |
70 /* Add, convert back to int16 and store to output */ | 70 /* Add, convert back to int16 and store to output */ |
71 out[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32, 11 ) ); | 71 out[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32, 11 ) ); |
72 } | 72 } |
73 } | 73 } |
74 | 74 |
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