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comparison: media/libopus/silk/stereo_decode_pred.c
media/libopus/silk/stereo_decode_pred.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:e101a8fa7949 |
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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 /* Decode mid/side predictors */ | |
| 35 void silk_stereo_decode_pred( | |
| 36 ec_dec *psRangeDec, /* I/O Compressor data structure */ | |
| 37 opus_int32 pred_Q13[] /* O Predictors */ | |
| 38 ) | |
| 39 { | |
| 40 opus_int n, ix[ 2 ][ 3 ]; | |
| 41 opus_int32 low_Q13, step_Q13; | |
| 42 | |
| 43 /* Entropy decoding */ | |
| 44 n = ec_dec_icdf( psRangeDec, silk_stereo_pred_joint_iCDF, 8 ); | |
| 45 ix[ 0 ][ 2 ] = silk_DIV32_16( n, 5 ); | |
| 46 ix[ 1 ][ 2 ] = n - 5 * ix[ 0 ][ 2 ]; | |
| 47 for( n = 0; n < 2; n++ ) { | |
| 48 ix[ n ][ 0 ] = ec_dec_icdf( psRangeDec, silk_uniform3_iCDF, 8 ); | |
| 49 ix[ n ][ 1 ] = ec_dec_icdf( psRangeDec, silk_uniform5_iCDF, 8 ); | |
| 50 } | |
| 51 | |
| 52 /* Dequantize */ | |
| 53 for( n = 0; n < 2; n++ ) { | |
| 54 ix[ n ][ 0 ] += 3 * ix[ n ][ 2 ]; | |
| 55 low_Q13 = silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] ]; | |
| 56 step_Q13 = silk_SMULWB( silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] + 1 ] - low_Q13, | |
| 57 SILK_FIX_CONST( 0.5 / STEREO_QUANT_SUB_STEPS, 16 ) ); | |
| 58 pred_Q13[ n ] = silk_SMLABB( low_Q13, step_Q13, 2 * ix[ n ][ 1 ] + 1 ); | |
| 59 } | |
| 60 | |
| 61 /* Subtract second from first predictor (helps when actually applying these) */ | |
| 62 pred_Q13[ 0 ] -= pred_Q13[ 1 ]; | |
| 63 } | |
| 64 | |
| 65 /* Decode mid-only flag */ | |
| 66 void silk_stereo_decode_mid_only( | |
| 67 ec_dec *psRangeDec, /* I/O Compressor data structure */ | |
| 68 opus_int *decode_only_mid /* O Flag that only mid channel has been coded */ | |
| 69 ) | |
| 70 { | |
| 71 /* Decode flag that only mid channel is coded */ | |
| 72 *decode_only_mid = ec_dec_icdf( psRangeDec, silk_stereo_only_code_mid_iCDF, 8 ); | |
| 73 } |
