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