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26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main_FIX.h"
33 #include "stack_alloc.h"
34
35 /* Calculates residual energies of input subframes where all subframes have LPC_order */
36 /* of preceding samples */
silk_residual_energy_FIX(opus_int32 nrgs[MAX_NB_SUBFR],opus_int nrgsQ[MAX_NB_SUBFR],const opus_int16 x[],opus_int16 a_Q12[2][MAX_LPC_ORDER],const opus_int32 gains[MAX_NB_SUBFR],const opus_int subfr_length,const opus_int nb_subfr,const opus_int LPC_order)37 void silk_residual_energy_FIX(
38 opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */
39 opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */
40 const opus_int16 x[], /* I Input signal */
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 */
43 const opus_int subfr_length, /* I Subframe length */
44 const opus_int nb_subfr, /* I Number of subframes */
45 const opus_int LPC_order /* I LPC order */
46 )
47 {
48 opus_int offset, i, j, rshift, lz1, lz2;
49 opus_int16 *LPC_res_ptr;
50 VARDECL( opus_int16, LPC_res );
51 const opus_int16 *x_ptr;
52 opus_int32 tmp32;
53 SAVE_STACK;
54
55 x_ptr = x;
56 offset = LPC_order + subfr_length;
57
58 /* 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 silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr );
61 for( i = 0; i < nb_subfr >> 1; i++ ) {
62 /* 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
65 /* Point to first subframe of the just calculated LPC residual signal */
66 LPC_res_ptr = LPC_res + LPC_order;
67 for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) {
68 /* Measure subframe energy */
69 silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length );
70
71 /* Set Q values for the measured energy */
72 nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift;
73
74 /* Move to next subframe */
75 LPC_res_ptr += offset;
76 }
77 /* Move to next frame half */
78 x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset;
79 }
80
81 /* Apply the squared subframe gains */
82 for( i = 0; i < nb_subfr; i++ ) {
83 /* Fully upscale gains and energies */
84 lz1 = silk_CLZ32( nrgs[ i ] ) - 1;
85 lz2 = silk_CLZ32( gains[ i ] ) - 1;
86
87 tmp32 = silk_LSHIFT32( gains[ i ], lz2 );
88
89 /* Find squared gains */
90 tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/
91
92 /* Scale energies */
93 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 }
96 RESTORE_STACK;
97 }
98