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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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35 /* Calculates residual energies of input subframes where all subframes have LPC_
order */ | 35 /* Calculates residual energies of input subframes where all subframes have LPC_
order */ |
36 /* of preceding samples
*/ | 36 /* of preceding samples
*/ |
37 void silk_residual_energy_FIX( | 37 void silk_residual_energy_FIX( |
38 opus_int32 nrgs[ MAX_NB_SUBFR ], /* O
Residual energy per subframe
*/ | 38 opus_int32 nrgs[ MAX_NB_SUBFR ], /* O
Residual energy per subframe
*/ |
39 opus_int nrgsQ[ MAX_NB_SUBFR ], /* O
Q value per subframe
*/ | 39 opus_int nrgsQ[ MAX_NB_SUBFR ], /* O
Q value per subframe
*/ |
40 const opus_int16 x[], /* I
Input signal
*/ | 40 const opus_int16 x[], /* I
Input signal
*/ |
41 opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I
AR coefs for each frame half
*/ | 41 opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I
AR coefs for each frame half
*/ |
42 const opus_int32 gains[ MAX_NB_SUBFR ], /* I
Quantization gains
*/ | 42 const opus_int32 gains[ MAX_NB_SUBFR ], /* I
Quantization gains
*/ |
43 const opus_int subfr_length, /* I
Subframe length
*/ | 43 const opus_int subfr_length, /* I
Subframe length
*/ |
44 const opus_int nb_subfr, /* I
Number of subframes
*/ | 44 const opus_int nb_subfr, /* I
Number of subframes
*/ |
45 const opus_int LPC_order /* I
LPC order
*/ | 45 const opus_int LPC_order, /* I
LPC order
*/ |
| 46 int arch /* I
Run-time architecture
*/ |
46 ) | 47 ) |
47 { | 48 { |
48 opus_int offset, i, j, rshift, lz1, lz2; | 49 opus_int offset, i, j, rshift, lz1, lz2; |
49 opus_int16 *LPC_res_ptr; | 50 opus_int16 *LPC_res_ptr; |
50 VARDECL( opus_int16, LPC_res ); | 51 VARDECL( opus_int16, LPC_res ); |
51 const opus_int16 *x_ptr; | 52 const opus_int16 *x_ptr; |
52 opus_int32 tmp32; | 53 opus_int32 tmp32; |
53 SAVE_STACK; | 54 SAVE_STACK; |
54 | 55 |
55 x_ptr = x; | 56 x_ptr = x; |
56 offset = LPC_order + subfr_length; | 57 offset = LPC_order + subfr_length; |
57 | 58 |
58 /* Filter input to create the LPC residual for each frame half, and measure
subframe energies */ | 59 /* Filter input to create the LPC residual for each frame half, and measure
subframe energies */ |
59 ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 ); | 60 ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 ); |
60 silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr ); | 61 silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr ); |
61 for( i = 0; i < nb_subfr >> 1; i++ ) { | 62 for( i = 0; i < nb_subfr >> 1; i++ ) { |
62 /* Calculate half frame LPC residual signal including preceding samples
*/ | 63 /* Calculate half frame LPC residual signal including preceding samples
*/ |
63 silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >>
1 ) * offset, LPC_order ); | 64 silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >>
1 ) * offset, LPC_order, arch ); |
64 | 65 |
65 /* Point to first subframe of the just calculated LPC residual signal */ | 66 /* Point to first subframe of the just calculated LPC residual signal */ |
66 LPC_res_ptr = LPC_res + LPC_order; | 67 LPC_res_ptr = LPC_res + LPC_order; |
67 for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) { | 68 for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) { |
68 /* Measure subframe energy */ | 69 /* Measure subframe energy */ |
69 silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift,
LPC_res_ptr, subfr_length ); | 70 silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift,
LPC_res_ptr, subfr_length ); |
70 | 71 |
71 /* Set Q values for the measured energy */ | 72 /* Set Q values for the measured energy */ |
72 nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift; | 73 nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift; |
73 | 74 |
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88 | 89 |
89 /* Find squared gains */ | 90 /* Find squared gains */ |
90 tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/ | 91 tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/ |
91 | 92 |
92 /* Scale energies */ | 93 /* Scale energies */ |
93 nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q(
nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/ | 94 nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q(
nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/ |
94 nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32; | 95 nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32; |
95 } | 96 } |
96 RESTORE_STACK; | 97 RESTORE_STACK; |
97 } | 98 } |
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