1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/decoder_set_fs.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,108 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main.h"
1.36 +
1.37 +/* Set decoder sampling rate */
1.38 +opus_int silk_decoder_set_fs(
1.39 + silk_decoder_state *psDec, /* I/O Decoder state pointer */
1.40 + opus_int fs_kHz, /* I Sampling frequency (kHz) */
1.41 + opus_int32 fs_API_Hz /* I API Sampling frequency (Hz) */
1.42 +)
1.43 +{
1.44 + opus_int frame_length, ret = 0;
1.45 +
1.46 + silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
1.47 + silk_assert( psDec->nb_subfr == MAX_NB_SUBFR || psDec->nb_subfr == MAX_NB_SUBFR/2 );
1.48 +
1.49 + /* New (sub)frame length */
1.50 + psDec->subfr_length = silk_SMULBB( SUB_FRAME_LENGTH_MS, fs_kHz );
1.51 + frame_length = silk_SMULBB( psDec->nb_subfr, psDec->subfr_length );
1.52 +
1.53 + /* Initialize resampler when switching internal or external sampling frequency */
1.54 + if( psDec->fs_kHz != fs_kHz || psDec->fs_API_hz != fs_API_Hz ) {
1.55 + /* Initialize the resampler for dec_API.c preparing resampling from fs_kHz to API_fs_Hz */
1.56 + ret += silk_resampler_init( &psDec->resampler_state, silk_SMULBB( fs_kHz, 1000 ), fs_API_Hz, 0 );
1.57 +
1.58 + psDec->fs_API_hz = fs_API_Hz;
1.59 + }
1.60 +
1.61 + if( psDec->fs_kHz != fs_kHz || frame_length != psDec->frame_length ) {
1.62 + if( fs_kHz == 8 ) {
1.63 + if( psDec->nb_subfr == MAX_NB_SUBFR ) {
1.64 + psDec->pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
1.65 + } else {
1.66 + psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
1.67 + }
1.68 + } else {
1.69 + if( psDec->nb_subfr == MAX_NB_SUBFR ) {
1.70 + psDec->pitch_contour_iCDF = silk_pitch_contour_iCDF;
1.71 + } else {
1.72 + psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
1.73 + }
1.74 + }
1.75 + if( psDec->fs_kHz != fs_kHz ) {
1.76 + psDec->ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
1.77 + if( fs_kHz == 8 || fs_kHz == 12 ) {
1.78 + psDec->LPC_order = MIN_LPC_ORDER;
1.79 + psDec->psNLSF_CB = &silk_NLSF_CB_NB_MB;
1.80 + } else {
1.81 + psDec->LPC_order = MAX_LPC_ORDER;
1.82 + psDec->psNLSF_CB = &silk_NLSF_CB_WB;
1.83 + }
1.84 + if( fs_kHz == 16 ) {
1.85 + psDec->pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
1.86 + } else if( fs_kHz == 12 ) {
1.87 + psDec->pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
1.88 + } else if( fs_kHz == 8 ) {
1.89 + psDec->pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
1.90 + } else {
1.91 + /* unsupported sampling rate */
1.92 + silk_assert( 0 );
1.93 + }
1.94 + psDec->first_frame_after_reset = 1;
1.95 + psDec->lagPrev = 100;
1.96 + psDec->LastGainIndex = 10;
1.97 + psDec->prevSignalType = TYPE_NO_VOICE_ACTIVITY;
1.98 + silk_memset( psDec->outBuf, 0, sizeof(psDec->outBuf));
1.99 + silk_memset( psDec->sLPC_Q14_buf, 0, sizeof(psDec->sLPC_Q14_buf) );
1.100 + }
1.101 +
1.102 + psDec->fs_kHz = fs_kHz;
1.103 + psDec->frame_length = frame_length;
1.104 + }
1.105 +
1.106 + /* Check that settings are valid */
1.107 + silk_assert( psDec->frame_length > 0 && psDec->frame_length <= MAX_FRAME_LENGTH );
1.108 +
1.109 + return ret;
1.110 +}
1.111 +
