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comparison: media/libopus/silk/quant_LTP_gains.c
media/libopus/silk/quant_LTP_gains.c
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- TOR_BUG_9701
- changeset 15
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| -1:000000000000 | 0:5588ebce1930 |
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| 1 /*********************************************************************** | |
| 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. | |
| 3 Redistribution and use in source and binary forms, with or without | |
| 4 modification, are permitted provided that the following conditions | |
| 5 are met: | |
| 6 - Redistributions of source code must retain the above copyright notice, | |
| 7 this list of conditions and the following disclaimer. | |
| 8 - Redistributions in binary form must reproduce the above copyright | |
| 9 notice, this list of conditions and the following disclaimer in the | |
| 10 documentation and/or other materials provided with the distribution. | |
| 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the | |
| 12 names of specific contributors, may be used to endorse or promote | |
| 13 products derived from this software without specific prior written | |
| 14 permission. | |
| 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 POSSIBILITY OF SUCH DAMAGE. | |
| 26 ***********************************************************************/ | |
| 27 | |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include "config.h" | |
| 30 #endif | |
| 31 | |
| 32 #include "main.h" | |
| 33 #include "tuning_parameters.h" | |
| 34 | |
| 35 void silk_quant_LTP_gains( | |
| 36 opus_int16 B_Q14[ MAX_NB_SUBFR * LTP_ORDER ], /* I/O (un)quantized LTP gains */ | |
| 37 opus_int8 cbk_index[ MAX_NB_SUBFR ], /* O Codebook Index */ | |
| 38 opus_int8 *periodicity_index, /* O Periodicity Index */ | |
| 39 opus_int32 *sum_log_gain_Q7, /* I/O Cumulative max prediction gain */ | |
| 40 const opus_int32 W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Error Weights in Q18 */ | |
| 41 opus_int mu_Q9, /* I Mu value (R/D tradeoff) */ | |
| 42 opus_int lowComplexity, /* I Flag for low complexity */ | |
| 43 const opus_int nb_subfr /* I number of subframes */ | |
| 44 ) | |
| 45 { | |
| 46 opus_int j, k, cbk_size; | |
| 47 opus_int8 temp_idx[ MAX_NB_SUBFR ]; | |
| 48 const opus_uint8 *cl_ptr_Q5; | |
| 49 const opus_int8 *cbk_ptr_Q7; | |
| 50 const opus_uint8 *cbk_gain_ptr_Q7; | |
| 51 const opus_int16 *b_Q14_ptr; | |
| 52 const opus_int32 *W_Q18_ptr; | |
| 53 opus_int32 rate_dist_Q14_subfr, rate_dist_Q14, min_rate_dist_Q14; | |
| 54 opus_int32 sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7, gain_Q7; | |
| 55 | |
| 56 /***************************************************/ | |
| 57 /* iterate over different codebooks with different */ | |
| 58 /* rates/distortions, and choose best */ | |
| 59 /***************************************************/ | |
| 60 min_rate_dist_Q14 = silk_int32_MAX; | |
| 61 best_sum_log_gain_Q7 = 0; | |
| 62 for( k = 0; k < 3; k++ ) { | |
| 63 /* Safety margin for pitch gain control, to take into account factors | |
| 64 such as state rescaling/rewhitening. */ | |
| 65 opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 ); | |
| 66 | |
| 67 cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ]; | |
| 68 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ]; | |
| 69 cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ]; | |
| 70 cbk_size = silk_LTP_vq_sizes[ k ]; | |
| 71 | |
| 72 /* Set up pointer to first subframe */ | |
| 73 W_Q18_ptr = W_Q18; | |
| 74 b_Q14_ptr = B_Q14; | |
| 75 | |
| 76 rate_dist_Q14 = 0; | |
| 77 sum_log_gain_tmp_Q7 = *sum_log_gain_Q7; | |
| 78 for( j = 0; j < nb_subfr; j++ ) { | |
| 79 max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 ) | |
| 80 + SILK_FIX_CONST( 7, 7 ) ) - gain_safety; | |
| 81 | |
| 82 silk_VQ_WMat_EC( | |
| 83 &temp_idx[ j ], /* O index of best codebook vector */ | |
| 84 &rate_dist_Q14_subfr, /* O best weighted quantization error + mu * rate */ | |
| 85 &gain_Q7, /* O sum of absolute LTP coefficients */ | |
| 86 b_Q14_ptr, /* I input vector to be quantized */ | |
| 87 W_Q18_ptr, /* I weighting matrix */ | |
| 88 cbk_ptr_Q7, /* I codebook */ | |
| 89 cbk_gain_ptr_Q7, /* I codebook effective gains */ | |
| 90 cl_ptr_Q5, /* I code length for each codebook vector */ | |
| 91 mu_Q9, /* I tradeoff between weighted error and rate */ | |
| 92 max_gain_Q7, /* I maximum sum of absolute LTP coefficients */ | |
| 93 cbk_size /* I number of vectors in codebook */ | |
| 94 ); | |
| 95 | |
| 96 rate_dist_Q14 = silk_ADD_POS_SAT32( rate_dist_Q14, rate_dist_Q14_subfr ); | |
| 97 sum_log_gain_tmp_Q7 = silk_max(0, sum_log_gain_tmp_Q7 | |
| 98 + silk_lin2log( gain_safety + gain_Q7 ) - SILK_FIX_CONST( 7, 7 )); | |
| 99 | |
| 100 b_Q14_ptr += LTP_ORDER; | |
| 101 W_Q18_ptr += LTP_ORDER * LTP_ORDER; | |
| 102 } | |
| 103 | |
| 104 /* Avoid never finding a codebook */ | |
| 105 rate_dist_Q14 = silk_min( silk_int32_MAX - 1, rate_dist_Q14 ); | |
| 106 | |
| 107 if( rate_dist_Q14 < min_rate_dist_Q14 ) { | |
| 108 min_rate_dist_Q14 = rate_dist_Q14; | |
| 109 *periodicity_index = (opus_int8)k; | |
| 110 silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) ); | |
| 111 best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7; | |
| 112 } | |
| 113 | |
| 114 /* Break early in low-complexity mode if rate distortion is below threshold */ | |
| 115 if( lowComplexity && ( rate_dist_Q14 < silk_LTP_gain_middle_avg_RD_Q14 ) ) { | |
| 116 break; | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ]; | |
| 121 for( j = 0; j < nb_subfr; j++ ) { | |
| 122 for( k = 0; k < LTP_ORDER; k++ ) { | |
| 123 B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 ); | |
| 124 } | |
| 125 } | |
| 126 *sum_log_gain_Q7 = best_sum_log_gain_Q7; | |
| 127 } | |
| 128 |
