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comparison: media/libopus/silk/decoder_set_fs.c
media/libopus/silk/decoder_set_fs.c
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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 /* 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 |
