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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. |
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67 } | 67 } |
68 } | 68 } |
69 } | 69 } |
70 q_ptr += SHELL_CODEC_FRAME_LENGTH; | 70 q_ptr += SHELL_CODEC_FRAME_LENGTH; |
71 } | 71 } |
72 } | 72 } |
73 | 73 |
74 /* Decodes signs of excitation */ | 74 /* Decodes signs of excitation */ |
75 void silk_decode_signs( | 75 void silk_decode_signs( |
76 ec_dec *psRangeDec, /* I/O Comp
ressor data structure */ | 76 ec_dec *psRangeDec, /* I/O Comp
ressor data structure */ |
77 opus_int pulses[], /* I/O puls
e signal */ | 77 opus_int16 pulses[], /* I/O puls
e signal */ |
78 opus_int length, /* I leng
th of input */ | 78 opus_int length, /* I leng
th of input */ |
79 const opus_int signalType, /* I Sign
al type */ | 79 const opus_int signalType, /* I Sign
al type */ |
80 const opus_int quantOffsetType, /* I Quan
tization offset type */ | 80 const opus_int quantOffsetType, /* I Quan
tization offset type */ |
81 const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum
of absolute pulses per block */ | 81 const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum
of absolute pulses per block */ |
82 ) | 82 ) |
83 { | 83 { |
84 opus_int i, j, p; | 84 opus_int i, j, p; |
85 opus_uint8 icdf[ 2 ]; | 85 opus_uint8 icdf[ 2 ]; |
86 opus_int *q_ptr; | 86 opus_int16 *q_ptr; |
87 const opus_uint8 *icdf_ptr; | 87 const opus_uint8 *icdf_ptr; |
88 | 88 |
89 icdf[ 1 ] = 0; | 89 icdf[ 1 ] = 0; |
90 q_ptr = pulses; | 90 q_ptr = pulses; |
91 i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); | 91 i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); |
92 icdf_ptr = &silk_sign_iCDF[ i ]; | 92 icdf_ptr = &silk_sign_iCDF[ i ]; |
93 length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_
FRAME_LENGTH ); | 93 length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_
FRAME_LENGTH ); |
94 for( i = 0; i < length; i++ ) { | 94 for( i = 0; i < length; i++ ) { |
95 p = sum_pulses[ i ]; | 95 p = sum_pulses[ i ]; |
96 if( p > 0 ) { | 96 if( p > 0 ) { |
97 icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; | 97 icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; |
98 for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { | 98 for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { |
99 if( q_ptr[ j ] > 0 ) { | 99 if( q_ptr[ j ] > 0 ) { |
100 /* attach sign */ | 100 /* attach sign */ |
101 #if 0 | 101 #if 0 |
102 /* conditional implementation */ | 102 /* conditional implementation */ |
103 if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) { | 103 if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) { |
104 q_ptr[ j ] = -q_ptr[ j ]; | 104 q_ptr[ j ] = -q_ptr[ j ]; |
105 } | 105 } |
106 #else | 106 #else |
107 /* implementation with shift, subtraction, multiplication */ | 107 /* implementation with shift, subtraction, multiplication */ |
108 q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8
) ); | 108 q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8
) ); |
109 #endif | 109 #endif |
110 } | 110 } |
111 } | 111 } |
112 } | 112 } |
113 q_ptr += SHELL_CODEC_FRAME_LENGTH; | 113 q_ptr += SHELL_CODEC_FRAME_LENGTH; |
114 } | 114 } |
115 } | 115 } |
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