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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 /* Set decoder sampling rate */
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35 opus_int silk_decoder_set_fs(
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36 silk_decoder_state *psDec, /* I/O Decoder state pointer */
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37 opus_int fs_kHz, /* I Sampling frequency (kHz) */
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38 opus_int32 fs_API_Hz /* I API Sampling frequency (Hz) */
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39 )
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40 {
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41 opus_int frame_length, ret = 0;
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42
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43 celt_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
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44 celt_assert( psDec->nb_subfr == MAX_NB_SUBFR || psDec->nb_subfr == MAX_NB_SUBFR/2 );
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45
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46 /* New (sub)frame length */
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47 psDec->subfr_length = silk_SMULBB( SUB_FRAME_LENGTH_MS, fs_kHz );
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48 frame_length = silk_SMULBB( psDec->nb_subfr, psDec->subfr_length );
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49
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50 /* Initialize resampler when switching internal or external sampling frequency */
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51 if( psDec->fs_kHz != fs_kHz || psDec->fs_API_hz != fs_API_Hz ) {
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52 /* Initialize the resampler for dec_API.c preparing resampling from fs_kHz to API_fs_Hz */
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53 ret += silk_resampler_init( &psDec->resampler_state, silk_SMULBB( fs_kHz, 1000 ), fs_API_Hz, 0 );
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54
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55 psDec->fs_API_hz = fs_API_Hz;
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56 }
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57
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58 if( psDec->fs_kHz != fs_kHz || frame_length != psDec->frame_length ) {
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59 if( fs_kHz == 8 ) {
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60 if( psDec->nb_subfr == MAX_NB_SUBFR ) {
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61 psDec->pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
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62 } else {
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63 psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
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64 }
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65 } else {
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66 if( psDec->nb_subfr == MAX_NB_SUBFR ) {
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67 psDec->pitch_contour_iCDF = silk_pitch_contour_iCDF;
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68 } else {
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69 psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
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70 }
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71 }
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72 if( psDec->fs_kHz != fs_kHz ) {
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73 psDec->ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
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74 if( fs_kHz == 8 || fs_kHz == 12 ) {
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75 psDec->LPC_order = MIN_LPC_ORDER;
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76 psDec->psNLSF_CB = &silk_NLSF_CB_NB_MB;
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77 } else {
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78 psDec->LPC_order = MAX_LPC_ORDER;
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79 psDec->psNLSF_CB = &silk_NLSF_CB_WB;
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80 }
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81 if( fs_kHz == 16 ) {
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82 psDec->pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
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83 } else if( fs_kHz == 12 ) {
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84 psDec->pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
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85 } else if( fs_kHz == 8 ) {
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86 psDec->pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
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87 } else {
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88 /* unsupported sampling rate */
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89 celt_assert( 0 );
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90 }
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91 psDec->first_frame_after_reset = 1;
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92 psDec->lagPrev = 100;
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93 psDec->LastGainIndex = 10;
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94 psDec->prevSignalType = TYPE_NO_VOICE_ACTIVITY;
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95 silk_memset( psDec->outBuf, 0, sizeof(psDec->outBuf));
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96 silk_memset( psDec->sLPC_Q14_buf, 0, sizeof(psDec->sLPC_Q14_buf) );
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97 }
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98
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99 psDec->fs_kHz = fs_kHz;
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100 psDec->frame_length = frame_length;
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101 }
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102
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103 /* Check that settings are valid */
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104 celt_assert( psDec->frame_length > 0 && psDec->frame_length <= MAX_FRAME_LENGTH );
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105
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106 return ret;
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107 }
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108
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