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26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main.h"
33
34 /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
silk_NLSF_VQ(opus_int32 err_Q26[],const opus_int16 in_Q15[],const opus_uint8 pCB_Q8[],const opus_int K,const opus_int LPC_order)35 void silk_NLSF_VQ(
36 opus_int32 err_Q26[], /* O Quantization errors [K] */
37 const opus_int16 in_Q15[], /* I Input vectors to be quantized [LPC_order] */
38 const opus_uint8 pCB_Q8[], /* I Codebook vectors [K*LPC_order] */
39 const opus_int K, /* I Number of codebook vectors */
40 const opus_int LPC_order /* I Number of LPCs */
41 )
42 {
43 opus_int i, m;
44 opus_int32 diff_Q15, sum_error_Q30, sum_error_Q26;
45
46 silk_assert( LPC_order <= 16 );
47 silk_assert( ( LPC_order & 1 ) == 0 );
48
49 /* Loop over codebook */
50 for( i = 0; i < K; i++ ) {
51 sum_error_Q26 = 0;
52 for( m = 0; m < LPC_order; m += 2 ) {
53 /* Compute weighted squared quantization error for index m */
54 diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/
55 sum_error_Q30 = silk_SMULBB( diff_Q15, diff_Q15 );
56
57 /* Compute weighted squared quantization error for index m + 1 */
58 diff_Q15 = silk_SUB_LSHIFT32( in_Q15[m + 1], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/
59 sum_error_Q30 = silk_SMLABB( sum_error_Q30, diff_Q15, diff_Q15 );
60
61 sum_error_Q26 = silk_ADD_RSHIFT32( sum_error_Q26, sum_error_Q30, 4 );
62
63 silk_assert( sum_error_Q26 >= 0 );
64 silk_assert( sum_error_Q30 >= 0 );
65 }
66 err_Q26[ i ] = sum_error_Q26;
67 }
68 }
69