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comparison: media/libopus/silk/decode_pulses.c
media/libopus/silk/decode_pulses.c
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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 | |
| 34 /*********************************************/ | |
| 35 /* Decode quantization indices of excitation */ | |
| 36 /*********************************************/ | |
| 37 void silk_decode_pulses( | |
| 38 ec_dec *psRangeDec, /* I/O Compressor data structure */ | |
| 39 opus_int pulses[], /* O Excitation signal */ | |
| 40 const opus_int signalType, /* I Sigtype */ | |
| 41 const opus_int quantOffsetType, /* I quantOffsetType */ | |
| 42 const opus_int frame_length /* I Frame length */ | |
| 43 ) | |
| 44 { | |
| 45 opus_int i, j, k, iter, abs_q, nLS, RateLevelIndex; | |
| 46 opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ]; | |
| 47 opus_int *pulses_ptr; | |
| 48 const opus_uint8 *cdf_ptr; | |
| 49 | |
| 50 /*********************/ | |
| 51 /* Decode rate level */ | |
| 52 /*********************/ | |
| 53 RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 ); | |
| 54 | |
| 55 /* Calculate number of shell blocks */ | |
| 56 silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH ); | |
| 57 iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH ); | |
| 58 if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) { | |
| 59 silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */ | |
| 60 iter++; | |
| 61 } | |
| 62 | |
| 63 /***************************************************/ | |
| 64 /* Sum-Weighted-Pulses Decoding */ | |
| 65 /***************************************************/ | |
| 66 cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ]; | |
| 67 for( i = 0; i < iter; i++ ) { | |
| 68 nLshifts[ i ] = 0; | |
| 69 sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 ); | |
| 70 | |
| 71 /* LSB indication */ | |
| 72 while( sum_pulses[ i ] == MAX_PULSES + 1 ) { | |
| 73 nLshifts[ i ]++; | |
| 74 /* When we've already got 10 LSBs, we shift the table to not allow (MAX_PULSES + 1) */ | |
| 75 sum_pulses[ i ] = ec_dec_icdf( psRangeDec, | |
| 76 silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 ); | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 /***************************************************/ | |
| 81 /* Shell decoding */ | |
| 82 /***************************************************/ | |
| 83 for( i = 0; i < iter; i++ ) { | |
| 84 if( sum_pulses[ i ] > 0 ) { | |
| 85 silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] ); | |
| 86 } else { | |
| 87 silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( opus_int ) ); | |
| 88 } | |
| 89 } | |
| 90 | |
| 91 /***************************************************/ | |
| 92 /* LSB Decoding */ | |
| 93 /***************************************************/ | |
| 94 for( i = 0; i < iter; i++ ) { | |
| 95 if( nLshifts[ i ] > 0 ) { | |
| 96 nLS = nLshifts[ i ]; | |
| 97 pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ]; | |
| 98 for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) { | |
| 99 abs_q = pulses_ptr[ k ]; | |
| 100 for( j = 0; j < nLS; j++ ) { | |
| 101 abs_q = silk_LSHIFT( abs_q, 1 ); | |
| 102 abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 ); | |
| 103 } | |
| 104 pulses_ptr[ k ] = abs_q; | |
| 105 } | |
| 106 /* Mark the number of pulses non-zero for sign decoding. */ | |
| 107 sum_pulses[ i ] |= nLS << 5; | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 /****************************************/ | |
| 112 /* Decode and add signs to pulse signal */ | |
| 113 /****************************************/ | |
| 114 silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses ); | |
| 115 } |
