media/libopus/silk/float/energy_FLP.c@b8a032363ba2 (annotated)
media/libopus/silk/float/energy_FLP.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| 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_FLP.h" |
| michael@0 | 33 | |
| michael@0 | 34 | /* sum of squares of a silk_float array, with result as double */ |
| michael@0 | 35 | double silk_energy_FLP( |
| michael@0 | 36 | const silk_float *data, |
| michael@0 | 37 | opus_int dataSize |
| michael@0 | 38 | ) |
| michael@0 | 39 | { |
| michael@0 | 40 | opus_int i, dataSize4; |
| michael@0 | 41 | double result; |
| michael@0 | 42 | |
| michael@0 | 43 | /* 4x unrolled loop */ |
| michael@0 | 44 | result = 0.0; |
| michael@0 | 45 | dataSize4 = dataSize & 0xFFFC; |
| michael@0 | 46 | for( i = 0; i < dataSize4; i += 4 ) { |
| michael@0 | 47 | result += data[ i + 0 ] * (double)data[ i + 0 ] + |
| michael@0 | 48 | data[ i + 1 ] * (double)data[ i + 1 ] + |
| michael@0 | 49 | data[ i + 2 ] * (double)data[ i + 2 ] + |
| michael@0 | 50 | data[ i + 3 ] * (double)data[ i + 3 ]; |
| michael@0 | 51 | } |
| michael@0 | 52 | |
| michael@0 | 53 | /* add any remaining products */ |
| michael@0 | 54 | for( ; i < dataSize; i++ ) { |
| michael@0 | 55 | result += data[ i ] * (double)data[ i ]; |
| michael@0 | 56 | } |
| michael@0 | 57 | |
| michael@0 | 58 | silk_assert( result >= 0.0 ); |
| michael@0 | 59 | return result; |
| michael@0 | 60 | } |
