media/libopus/silk/decode_pulses.c@6474c204b198 (annotated)
media/libopus/silk/decode_pulses.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /*********************************************************************** |
| michael@0 | 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| michael@0 | 3 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 4 | modification, are permitted provided that the following conditions |
| michael@0 | 5 | are met: |
| michael@0 | 6 | - Redistributions of source code must retain the above copyright notice, |
| michael@0 | 7 | this list of conditions and the following disclaimer. |
| michael@0 | 8 | - Redistributions in binary form must reproduce the above copyright |
| michael@0 | 9 | notice, this list of conditions and the following disclaimer in the |
| michael@0 | 10 | documentation and/or other materials provided with the distribution. |
| michael@0 | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| michael@0 | 12 | names of specific contributors, may be used to endorse or promote |
| michael@0 | 13 | products derived from this software without specific prior written |
| michael@0 | 14 | permission. |
| michael@0 | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| michael@0 | 16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| michael@0 | 17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| michael@0 | 18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| michael@0 | 19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| michael@0 | 20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| michael@0 | 21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| michael@0 | 22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| michael@0 | 23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| michael@0 | 25 | POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 26 | ***********************************************************************/ |
| michael@0 | 27 | |
| michael@0 | 28 | #ifdef HAVE_CONFIG_H |
| michael@0 | 29 | #include "config.h" |
| michael@0 | 30 | #endif |
| michael@0 | 31 | |
| michael@0 | 32 | #include "main.h" |
| michael@0 | 33 | |
| michael@0 | 34 | /*********************************************/ |
| michael@0 | 35 | /* Decode quantization indices of excitation */ |
| michael@0 | 36 | /*********************************************/ |
| michael@0 | 37 | void silk_decode_pulses( |
| michael@0 | 38 | ec_dec *psRangeDec, /* I/O Compressor data structure */ |
| michael@0 | 39 | opus_int pulses[], /* O Excitation signal */ |
| michael@0 | 40 | const opus_int signalType, /* I Sigtype */ |
| michael@0 | 41 | const opus_int quantOffsetType, /* I quantOffsetType */ |
| michael@0 | 42 | const opus_int frame_length /* I Frame length */ |
| michael@0 | 43 | ) |
| michael@0 | 44 | { |
| michael@0 | 45 | opus_int i, j, k, iter, abs_q, nLS, RateLevelIndex; |
| michael@0 | 46 | opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ]; |
| michael@0 | 47 | opus_int *pulses_ptr; |
| michael@0 | 48 | const opus_uint8 *cdf_ptr; |
| michael@0 | 49 | |
| michael@0 | 50 | /*********************/ |
| michael@0 | 51 | /* Decode rate level */ |
| michael@0 | 52 | /*********************/ |
| michael@0 | 53 | RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 ); |
| michael@0 | 54 | |
| michael@0 | 55 | /* Calculate number of shell blocks */ |
| michael@0 | 56 | silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH ); |
| michael@0 | 57 | iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH ); |
| michael@0 | 58 | if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) { |
| michael@0 | 59 | silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */ |
| michael@0 | 60 | iter++; |
| michael@0 | 61 | } |
| michael@0 | 62 | |
| michael@0 | 63 | /***************************************************/ |
| michael@0 | 64 | /* Sum-Weighted-Pulses Decoding */ |
| michael@0 | 65 | /***************************************************/ |
| michael@0 | 66 | cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ]; |
| michael@0 | 67 | for( i = 0; i < iter; i++ ) { |
| michael@0 | 68 | nLshifts[ i ] = 0; |
| michael@0 | 69 | sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 ); |
| michael@0 | 70 | |
| michael@0 | 71 | /* LSB indication */ |
| michael@0 | 72 | while( sum_pulses[ i ] == MAX_PULSES + 1 ) { |
| michael@0 | 73 | nLshifts[ i ]++; |
| michael@0 | 74 | /* When we've already got 10 LSBs, we shift the table to not allow (MAX_PULSES + 1) */ |
| michael@0 | 75 | sum_pulses[ i ] = ec_dec_icdf( psRangeDec, |
| michael@0 | 76 | silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 ); |
| michael@0 | 77 | } |
| michael@0 | 78 | } |
| michael@0 | 79 | |
| michael@0 | 80 | /***************************************************/ |
| michael@0 | 81 | /* Shell decoding */ |
| michael@0 | 82 | /***************************************************/ |
| michael@0 | 83 | for( i = 0; i < iter; i++ ) { |
| michael@0 | 84 | if( sum_pulses[ i ] > 0 ) { |
| michael@0 | 85 | silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] ); |
| michael@0 | 86 | } else { |
| michael@0 | 87 | silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( opus_int ) ); |
| michael@0 | 88 | } |
| michael@0 | 89 | } |
| michael@0 | 90 | |
| michael@0 | 91 | /***************************************************/ |
| michael@0 | 92 | /* LSB Decoding */ |
| michael@0 | 93 | /***************************************************/ |
| michael@0 | 94 | for( i = 0; i < iter; i++ ) { |
| michael@0 | 95 | if( nLshifts[ i ] > 0 ) { |
| michael@0 | 96 | nLS = nLshifts[ i ]; |
| michael@0 | 97 | pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ]; |
| michael@0 | 98 | for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) { |
| michael@0 | 99 | abs_q = pulses_ptr[ k ]; |
| michael@0 | 100 | for( j = 0; j < nLS; j++ ) { |
| michael@0 | 101 | abs_q = silk_LSHIFT( abs_q, 1 ); |
| michael@0 | 102 | abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 ); |
| michael@0 | 103 | } |
| michael@0 | 104 | pulses_ptr[ k ] = abs_q; |
| michael@0 | 105 | } |
| michael@0 | 106 | /* Mark the number of pulses non-zero for sign decoding. */ |
| michael@0 | 107 | sum_pulses[ i ] |= nLS << 5; |
| michael@0 | 108 | } |
| michael@0 | 109 | } |
| michael@0 | 110 | |
| michael@0 | 111 | /****************************************/ |
| michael@0 | 112 | /* Decode and add signs to pulse signal */ |
| michael@0 | 113 | /****************************************/ |
| michael@0 | 114 | silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses ); |
| michael@0 | 115 | } |
