Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 1 | /*********************************************************************** |
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Jean-Marc Valin | 5a48412 | 2011-08-15 10:49:53 -0400 | [diff] [blame] | 28 | #ifdef HAVE_CONFIG_H |
| 29 | #include "config.h" |
| 30 | #endif |
| 31 | |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 32 | #include "silk_define.h" |
| 33 | #include "silk_SigProc_FIX.h" |
| 34 | |
| 35 | /* |
| 36 | R. Laroia, N. Phamdo and N. Farvardin, "Robust and Efficient Quantization of Speech LSP |
| 37 | Parameters Using Structured Vector Quantization", Proc. IEEE Int. Conf. Acoust., Speech, |
| 38 | Signal Processing, pp. 641-644, 1991. |
| 39 | */ |
| 40 | |
| 41 | /* Laroia low complexity NLSF weights */ |
| 42 | void silk_NLSF_VQ_weights_laroia( |
| 43 | opus_int16 *pNLSFW_Q_OUT, /* O: Pointer to input vector weights [D x 1] */ |
| 44 | const opus_int16 *pNLSF_Q15, /* I: Pointer to input vector [D x 1] */ |
| 45 | const opus_int D /* I: Input vector dimension (even) */ |
| 46 | ) |
| 47 | { |
| 48 | opus_int k; |
| 49 | opus_int32 tmp1_int, tmp2_int; |
| 50 | |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame^] | 51 | silk_assert( D > 0 ); |
| 52 | silk_assert( ( D & 1 ) == 0 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 53 | |
| 54 | /* First value */ |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame^] | 55 | tmp1_int = silk_max_int( pNLSF_Q15[ 0 ], 1 ); |
| 56 | tmp1_int = silk_DIV32_16( 1 << ( 15 + NLSF_W_Q ), tmp1_int ); |
| 57 | tmp2_int = silk_max_int( pNLSF_Q15[ 1 ] - pNLSF_Q15[ 0 ], 1 ); |
| 58 | tmp2_int = silk_DIV32_16( 1 << ( 15 + NLSF_W_Q ), tmp2_int ); |
| 59 | pNLSFW_Q_OUT[ 0 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX ); |
| 60 | silk_assert( pNLSFW_Q_OUT[ 0 ] > 0 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 61 | |
| 62 | /* Main loop */ |
| 63 | for( k = 1; k < D - 1; k += 2 ) { |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame^] | 64 | tmp1_int = silk_max_int( pNLSF_Q15[ k + 1 ] - pNLSF_Q15[ k ], 1 ); |
| 65 | tmp1_int = silk_DIV32_16( 1 << ( 15 + NLSF_W_Q ), tmp1_int ); |
| 66 | pNLSFW_Q_OUT[ k ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX ); |
| 67 | silk_assert( pNLSFW_Q_OUT[ k ] > 0 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 68 | |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame^] | 69 | tmp2_int = silk_max_int( pNLSF_Q15[ k + 2 ] - pNLSF_Q15[ k + 1 ], 1 ); |
| 70 | tmp2_int = silk_DIV32_16( 1 << ( 15 + NLSF_W_Q ), tmp2_int ); |
| 71 | pNLSFW_Q_OUT[ k + 1 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX ); |
| 72 | silk_assert( pNLSFW_Q_OUT[ k + 1 ] > 0 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | /* Last value */ |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame^] | 76 | tmp1_int = silk_max_int( ( 1 << 15 ) - pNLSF_Q15[ D - 1 ], 1 ); |
| 77 | tmp1_int = silk_DIV32_16( 1 << ( 15 + NLSF_W_Q ), tmp1_int ); |
| 78 | pNLSFW_Q_OUT[ D - 1 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX ); |
| 79 | silk_assert( pNLSFW_Q_OUT[ D - 1 ] > 0 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 80 | } |