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1 /***********************************************************************
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2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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3 Redistribution and use in source and binary forms, with or without
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4 modification, are permitted provided that the following conditions
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5 are met:
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6 - Redistributions of source code must retain the above copyright notice,
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7 this list of conditions and the following disclaimer.
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8 - Redistributions in binary form must reproduce the above copyright
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9 notice, this list of conditions and the following disclaimer in the
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10 documentation and/or other materials provided with the distribution.
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11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
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12 names of specific contributors, may be used to endorse or promote
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13 products derived from this software without specific prior written
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14 permission.
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15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 POSSIBILITY OF SUCH DAMAGE.
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26 ***********************************************************************/
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27
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28 #ifdef HAVE_CONFIG_H
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29 #include "config.h"
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30 #endif
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31
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32 #include "main.h"
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33
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34 /* Decode mid/side predictors */
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35 void silk_stereo_decode_pred(
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36 ec_dec *psRangeDec, /* I/O Compressor data structure */
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37 opus_int32 pred_Q13[] /* O Predictors */
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38 )
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39 {
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40 opus_int n, ix[ 2 ][ 3 ];
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41 opus_int32 low_Q13, step_Q13;
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42
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43 /* Entropy decoding */
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44 n = ec_dec_icdf( psRangeDec, silk_stereo_pred_joint_iCDF, 8 );
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45 ix[ 0 ][ 2 ] = silk_DIV32_16( n, 5 );
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46 ix[ 1 ][ 2 ] = n - 5 * ix[ 0 ][ 2 ];
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47 for( n = 0; n < 2; n++ ) {
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48 ix[ n ][ 0 ] = ec_dec_icdf( psRangeDec, silk_uniform3_iCDF, 8 );
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49 ix[ n ][ 1 ] = ec_dec_icdf( psRangeDec, silk_uniform5_iCDF, 8 );
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50 }
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51
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52 /* Dequantize */
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53 for( n = 0; n < 2; n++ ) {
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54 ix[ n ][ 0 ] += 3 * ix[ n ][ 2 ];
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55 low_Q13 = silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] ];
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56 step_Q13 = silk_SMULWB( silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] + 1 ] - low_Q13,
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57 SILK_FIX_CONST( 0.5 / STEREO_QUANT_SUB_STEPS, 16 ) );
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58 pred_Q13[ n ] = silk_SMLABB( low_Q13, step_Q13, 2 * ix[ n ][ 1 ] + 1 );
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59 }
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60
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61 /* Subtract second from first predictor (helps when actually applying these) */
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62 pred_Q13[ 0 ] -= pred_Q13[ 1 ];
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63 }
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64
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65 /* Decode mid-only flag */
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66 void silk_stereo_decode_mid_only(
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67 ec_dec *psRangeDec, /* I/O Compressor data structure */
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68 opus_int *decode_only_mid /* O Flag that only mid channel has been coded */
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69 )
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70 {
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71 /* Decode flag that only mid channel is coded */
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72 *decode_only_mid = ec_dec_icdf( psRangeDec, silk_stereo_only_code_mid_iCDF, 8 );
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73 }
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