| /*********************************************************************** |
| Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
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| modification, are permitted provided that the following conditions |
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| this list of conditions and the following disclaimer. |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| - Neither the name of Internet Society, IETF or IETF Trust, nor the |
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| products derived from this software without specific prior written |
| permission. |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| ***********************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "main.h" |
| |
| /* Entropy constrained matrix-weighted VQ, hard-coded to 5-element vectors, for a single input data vector */ |
| void silk_VQ_WMat_EC_c( |
| opus_int8 *ind, /* O index of best codebook vector */ |
| opus_int32 *res_nrg_Q15, /* O best residual energy */ |
| opus_int32 *rate_dist_Q8, /* O best total bitrate */ |
| opus_int *gain_Q7, /* O sum of absolute LTP coefficients */ |
| const opus_int32 *XX_Q17, /* I correlation matrix */ |
| const opus_int32 *xX_Q17, /* I correlation vector */ |
| const opus_int8 *cb_Q7, /* I codebook */ |
| const opus_uint8 *cb_gain_Q7, /* I codebook effective gain */ |
| const opus_uint8 *cl_Q5, /* I code length for each codebook vector */ |
| const opus_int subfr_len, /* I number of samples per subframe */ |
| const opus_int32 max_gain_Q7, /* I maximum sum of absolute LTP coefficients */ |
| const opus_int L /* I number of vectors in codebook */ |
| ) |
| { |
| opus_int k, gain_tmp_Q7; |
| const opus_int8 *cb_row_Q7; |
| opus_int32 neg_xX_Q24[ 5 ]; |
| opus_int32 sum1_Q15, sum2_Q24; |
| opus_int32 bits_res_Q8, bits_tot_Q8; |
| |
| /* Negate and convert to new Q domain */ |
| neg_xX_Q24[ 0 ] = -silk_LSHIFT32( xX_Q17[ 0 ], 7 ); |
| neg_xX_Q24[ 1 ] = -silk_LSHIFT32( xX_Q17[ 1 ], 7 ); |
| neg_xX_Q24[ 2 ] = -silk_LSHIFT32( xX_Q17[ 2 ], 7 ); |
| neg_xX_Q24[ 3 ] = -silk_LSHIFT32( xX_Q17[ 3 ], 7 ); |
| neg_xX_Q24[ 4 ] = -silk_LSHIFT32( xX_Q17[ 4 ], 7 ); |
| |
| /* Loop over codebook */ |
| *rate_dist_Q8 = silk_int32_MAX; |
| *res_nrg_Q15 = silk_int32_MAX; |
| cb_row_Q7 = cb_Q7; |
| /* In things go really bad, at least *ind is set to something safe. */ |
| *ind = 0; |
| for( k = 0; k < L; k++ ) { |
| opus_int32 penalty; |
| gain_tmp_Q7 = cb_gain_Q7[k]; |
| /* Weighted rate */ |
| /* Quantization error: 1 - 2 * xX * cb + cb' * XX * cb */ |
| sum1_Q15 = SILK_FIX_CONST( 1.001, 15 ); |
| |
| /* Penalty for too large gain */ |
| penalty = silk_LSHIFT32( silk_max( silk_SUB32( gain_tmp_Q7, max_gain_Q7 ), 0 ), 11 ); |
| |
| /* first row of XX_Q17 */ |
| sum2_Q24 = silk_MLA( neg_xX_Q24[ 0 ], XX_Q17[ 1 ], cb_row_Q7[ 1 ] ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 2 ], cb_row_Q7[ 2 ] ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 3 ], cb_row_Q7[ 3 ] ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 4 ], cb_row_Q7[ 4 ] ); |
| sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 0 ], cb_row_Q7[ 0 ] ); |
| sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 0 ] ); |
| |
| /* second row of XX_Q17 */ |
| sum2_Q24 = silk_MLA( neg_xX_Q24[ 1 ], XX_Q17[ 7 ], cb_row_Q7[ 2 ] ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 8 ], cb_row_Q7[ 3 ] ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 9 ], cb_row_Q7[ 4 ] ); |
| sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 6 ], cb_row_Q7[ 1 ] ); |
| sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 1 ] ); |
| |
| /* third row of XX_Q17 */ |
| sum2_Q24 = silk_MLA( neg_xX_Q24[ 2 ], XX_Q17[ 13 ], cb_row_Q7[ 3 ] ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 14 ], cb_row_Q7[ 4 ] ); |
| sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 12 ], cb_row_Q7[ 2 ] ); |
| sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 2 ] ); |
| |
| /* fourth row of XX_Q17 */ |
| sum2_Q24 = silk_MLA( neg_xX_Q24[ 3 ], XX_Q17[ 19 ], cb_row_Q7[ 4 ] ); |
| sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 18 ], cb_row_Q7[ 3 ] ); |
| sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 3 ] ); |
| |
| /* last row of XX_Q17 */ |
| sum2_Q24 = silk_LSHIFT32( neg_xX_Q24[ 4 ], 1 ); |
| sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 24 ], cb_row_Q7[ 4 ] ); |
| sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 4 ] ); |
| |
| /* find best */ |
| if( sum1_Q15 >= 0 ) { |
| /* Translate residual energy to bits using high-rate assumption (6 dB ==> 1 bit/sample) */ |
| bits_res_Q8 = silk_SMULBB( subfr_len, silk_lin2log( sum1_Q15 + penalty) - (15 << 7) ); |
| /* In the following line we reduce the codelength component by half ("-1"); seems to slghtly improve quality */ |
| bits_tot_Q8 = silk_ADD_LSHIFT32( bits_res_Q8, cl_Q5[ k ], 3-1 ); |
| if( bits_tot_Q8 <= *rate_dist_Q8 ) { |
| *rate_dist_Q8 = bits_tot_Q8; |
| *res_nrg_Q15 = sum1_Q15 + penalty; |
| *ind = (opus_int8)k; |
| *gain_Q7 = gain_tmp_Q7; |
| } |
| } |
| |
| /* Go to next cbk vector */ |
| cb_row_Q7 += LTP_ORDER; |
| } |
| } |
