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comparison: media/libopus/silk/code_signs.c
media/libopus/silk/code_signs.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:7729cdd2caa7 |
|---|---|
| 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 "main.h" | |
| 33 | |
| 34 /*#define silk_enc_map(a) ((a) > 0 ? 1 : 0)*/ | |
| 35 /*#define silk_dec_map(a) ((a) > 0 ? 1 : -1)*/ | |
| 36 /* shifting avoids if-statement */ | |
| 37 #define silk_enc_map(a) ( silk_RSHIFT( (a), 15 ) + 1 ) | |
| 38 #define silk_dec_map(a) ( silk_LSHIFT( (a), 1 ) - 1 ) | |
| 39 | |
| 40 /* Encodes signs of excitation */ | |
| 41 void silk_encode_signs( | |
| 42 ec_enc *psRangeEnc, /* I/O Compressor data structure */ | |
| 43 const opus_int8 pulses[], /* I pulse signal */ | |
| 44 opus_int length, /* I length of input */ | |
| 45 const opus_int signalType, /* I Signal type */ | |
| 46 const opus_int quantOffsetType, /* I Quantization offset type */ | |
| 47 const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ | |
| 48 ) | |
| 49 { | |
| 50 opus_int i, j, p; | |
| 51 opus_uint8 icdf[ 2 ]; | |
| 52 const opus_int8 *q_ptr; | |
| 53 const opus_uint8 *icdf_ptr; | |
| 54 | |
| 55 icdf[ 1 ] = 0; | |
| 56 q_ptr = pulses; | |
| 57 i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); | |
| 58 icdf_ptr = &silk_sign_iCDF[ i ]; | |
| 59 length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); | |
| 60 for( i = 0; i < length; i++ ) { | |
| 61 p = sum_pulses[ i ]; | |
| 62 if( p > 0 ) { | |
| 63 icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; | |
| 64 for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { | |
| 65 if( q_ptr[ j ] != 0 ) { | |
| 66 ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 ); | |
| 67 } | |
| 68 } | |
| 69 } | |
| 70 q_ptr += SHELL_CODEC_FRAME_LENGTH; | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 /* Decodes signs of excitation */ | |
| 75 void silk_decode_signs( | |
| 76 ec_dec *psRangeDec, /* I/O Compressor data structure */ | |
| 77 opus_int pulses[], /* I/O pulse signal */ | |
| 78 opus_int length, /* I length of input */ | |
| 79 const opus_int signalType, /* I Signal type */ | |
| 80 const opus_int quantOffsetType, /* I Quantization offset type */ | |
| 81 const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ | |
| 82 ) | |
| 83 { | |
| 84 opus_int i, j, p; | |
| 85 opus_uint8 icdf[ 2 ]; | |
| 86 opus_int *q_ptr; | |
| 87 const opus_uint8 *icdf_ptr; | |
| 88 | |
| 89 icdf[ 1 ] = 0; | |
| 90 q_ptr = pulses; | |
| 91 i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); | |
| 92 icdf_ptr = &silk_sign_iCDF[ i ]; | |
| 93 length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); | |
| 94 for( i = 0; i < length; i++ ) { | |
| 95 p = sum_pulses[ i ]; | |
| 96 if( p > 0 ) { | |
| 97 icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; | |
| 98 for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { | |
| 99 if( q_ptr[ j ] > 0 ) { | |
| 100 /* attach sign */ | |
| 101 #if 0 | |
| 102 /* conditional implementation */ | |
| 103 if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) { | |
| 104 q_ptr[ j ] = -q_ptr[ j ]; | |
| 105 } | |
| 106 #else | |
| 107 /* implementation with shift, subtraction, multiplication */ | |
| 108 q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) ); | |
| 109 #endif | |
| 110 } | |
| 111 } | |
| 112 } | |
| 113 q_ptr += SHELL_CODEC_FRAME_LENGTH; | |
| 114 } | |
| 115 } |
