michael@0: /***********************************************************************
michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0: Redistribution and use in source and binary forms, with or without
michael@0: modification, are permitted provided that the following conditions
michael@0: are met:
michael@0: - Redistributions of source code must retain the above copyright notice,
michael@0: this list of conditions and the following disclaimer.
michael@0: - Redistributions in binary form must reproduce the above copyright
michael@0: notice, this list of conditions and the following disclaimer in the
michael@0: documentation and/or other materials provided with the distribution.
michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0: names of specific contributors, may be used to endorse or promote
michael@0: products derived from this software without specific prior written
michael@0: permission.
michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0: POSSIBILITY OF SUCH DAMAGE.
michael@0: ***********************************************************************/
michael@0: 
michael@0: #ifdef HAVE_CONFIG_H
michael@0: #include "config.h"
michael@0: #endif
michael@0: 
michael@0: #include "main.h"
michael@0: 
michael@0: /* Set decoder sampling rate */
michael@0: opus_int silk_decoder_set_fs(
michael@0:     silk_decoder_state          *psDec,                         /* I/O  Decoder state pointer                       */
michael@0:     opus_int                    fs_kHz,                         /* I    Sampling frequency (kHz)                    */
michael@0:     opus_int32                  fs_API_Hz                       /* I    API Sampling frequency (Hz)                 */
michael@0: )
michael@0: {
michael@0:     opus_int frame_length, ret = 0;
michael@0: 
michael@0:     silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
michael@0:     silk_assert( psDec->nb_subfr == MAX_NB_SUBFR || psDec->nb_subfr == MAX_NB_SUBFR/2 );
michael@0: 
michael@0:     /* New (sub)frame length */
michael@0:     psDec->subfr_length = silk_SMULBB( SUB_FRAME_LENGTH_MS, fs_kHz );
michael@0:     frame_length = silk_SMULBB( psDec->nb_subfr, psDec->subfr_length );
michael@0: 
michael@0:     /* Initialize resampler when switching internal or external sampling frequency */
michael@0:     if( psDec->fs_kHz != fs_kHz || psDec->fs_API_hz != fs_API_Hz ) {
michael@0:         /* Initialize the resampler for dec_API.c preparing resampling from fs_kHz to API_fs_Hz */
michael@0:         ret += silk_resampler_init( &psDec->resampler_state, silk_SMULBB( fs_kHz, 1000 ), fs_API_Hz, 0 );
michael@0: 
michael@0:         psDec->fs_API_hz = fs_API_Hz;
michael@0:     }
michael@0: 
michael@0:     if( psDec->fs_kHz != fs_kHz || frame_length != psDec->frame_length ) {
michael@0:         if( fs_kHz == 8 ) {
michael@0:             if( psDec->nb_subfr == MAX_NB_SUBFR ) {
michael@0:                 psDec->pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
michael@0:             } else {
michael@0:                 psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
michael@0:             }
michael@0:         } else {
michael@0:             if( psDec->nb_subfr == MAX_NB_SUBFR ) {
michael@0:                 psDec->pitch_contour_iCDF = silk_pitch_contour_iCDF;
michael@0:             } else {
michael@0:                 psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
michael@0:             }
michael@0:         }
michael@0:         if( psDec->fs_kHz != fs_kHz ) {
michael@0:             psDec->ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
michael@0:             if( fs_kHz == 8 || fs_kHz == 12 ) {
michael@0:                 psDec->LPC_order = MIN_LPC_ORDER;
michael@0:                 psDec->psNLSF_CB = &silk_NLSF_CB_NB_MB;
michael@0:             } else {
michael@0:                 psDec->LPC_order = MAX_LPC_ORDER;
michael@0:                 psDec->psNLSF_CB = &silk_NLSF_CB_WB;
michael@0:             }
michael@0:             if( fs_kHz == 16 ) {
michael@0:                 psDec->pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
michael@0:             } else if( fs_kHz == 12 ) {
michael@0:                 psDec->pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
michael@0:             } else if( fs_kHz == 8 ) {
michael@0:                 psDec->pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
michael@0:             } else {
michael@0:                 /* unsupported sampling rate */
michael@0:                 silk_assert( 0 );
michael@0:             }
michael@0:             psDec->first_frame_after_reset = 1;
michael@0:             psDec->lagPrev                 = 100;
michael@0:             psDec->LastGainIndex           = 10;
michael@0:             psDec->prevSignalType          = TYPE_NO_VOICE_ACTIVITY;
michael@0:             silk_memset( psDec->outBuf, 0, sizeof(psDec->outBuf));
michael@0:             silk_memset( psDec->sLPC_Q14_buf, 0, sizeof(psDec->sLPC_Q14_buf) );
michael@0:         }
michael@0: 
michael@0:         psDec->fs_kHz       = fs_kHz;
michael@0:         psDec->frame_length = frame_length;
michael@0:     }
michael@0: 
michael@0:     /* Check that settings are valid */
michael@0:     silk_assert( psDec->frame_length > 0 && psDec->frame_length <= MAX_FRAME_LENGTH );
michael@0: 
michael@0:     return ret;
michael@0: }
michael@0: