Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 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 | } |