Chris@69: /***********************************************************************
Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69: Redistribution and use in source and binary forms, with or without
Chris@69: modification, are permitted provided that the following conditions
Chris@69: are met:
Chris@69: - Redistributions of source code must retain the above copyright notice,
Chris@69: this list of conditions and the following disclaimer.
Chris@69: - Redistributions in binary form must reproduce the above copyright
Chris@69: notice, this list of conditions and the following disclaimer in the
Chris@69: documentation and/or other materials provided with the distribution.
Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69: names of specific contributors, may be used to endorse or promote
Chris@69: products derived from this software without specific prior written
Chris@69: permission.
Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
Chris@69: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Chris@69: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Chris@69: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69: POSSIBILITY OF SUCH DAMAGE.
Chris@69: ***********************************************************************/
Chris@69: 
Chris@69: #ifdef HAVE_CONFIG_H
Chris@69: #include "config.h"
Chris@69: #endif
Chris@69: 
Chris@69: #include "main.h"
Chris@69: 
Chris@69: /* Set decoder sampling rate */
Chris@69: opus_int silk_decoder_set_fs(
Chris@69:     silk_decoder_state          *psDec,                         /* I/O  Decoder state pointer                       */
Chris@69:     opus_int                    fs_kHz,                         /* I    Sampling frequency (kHz)                    */
Chris@69:     opus_int32                  fs_API_Hz                       /* I    API Sampling frequency (Hz)                 */
Chris@69: )
Chris@69: {
Chris@69:     opus_int frame_length, ret = 0;
Chris@69: 
Chris@69:     celt_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
Chris@69:     celt_assert( psDec->nb_subfr == MAX_NB_SUBFR || psDec->nb_subfr == MAX_NB_SUBFR/2 );
Chris@69: 
Chris@69:     /* New (sub)frame length */
Chris@69:     psDec->subfr_length = silk_SMULBB( SUB_FRAME_LENGTH_MS, fs_kHz );
Chris@69:     frame_length = silk_SMULBB( psDec->nb_subfr, psDec->subfr_length );
Chris@69: 
Chris@69:     /* Initialize resampler when switching internal or external sampling frequency */
Chris@69:     if( psDec->fs_kHz != fs_kHz || psDec->fs_API_hz != fs_API_Hz ) {
Chris@69:         /* Initialize the resampler for dec_API.c preparing resampling from fs_kHz to API_fs_Hz */
Chris@69:         ret += silk_resampler_init( &psDec->resampler_state, silk_SMULBB( fs_kHz, 1000 ), fs_API_Hz, 0 );
Chris@69: 
Chris@69:         psDec->fs_API_hz = fs_API_Hz;
Chris@69:     }
Chris@69: 
Chris@69:     if( psDec->fs_kHz != fs_kHz || frame_length != psDec->frame_length ) {
Chris@69:         if( fs_kHz == 8 ) {
Chris@69:             if( psDec->nb_subfr == MAX_NB_SUBFR ) {
Chris@69:                 psDec->pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
Chris@69:             } else {
Chris@69:                 psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
Chris@69:             }
Chris@69:         } else {
Chris@69:             if( psDec->nb_subfr == MAX_NB_SUBFR ) {
Chris@69:                 psDec->pitch_contour_iCDF = silk_pitch_contour_iCDF;
Chris@69:             } else {
Chris@69:                 psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
Chris@69:             }
Chris@69:         }
Chris@69:         if( psDec->fs_kHz != fs_kHz ) {
Chris@69:             psDec->ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
Chris@69:             if( fs_kHz == 8 || fs_kHz == 12 ) {
Chris@69:                 psDec->LPC_order = MIN_LPC_ORDER;
Chris@69:                 psDec->psNLSF_CB = &silk_NLSF_CB_NB_MB;
Chris@69:             } else {
Chris@69:                 psDec->LPC_order = MAX_LPC_ORDER;
Chris@69:                 psDec->psNLSF_CB = &silk_NLSF_CB_WB;
Chris@69:             }
Chris@69:             if( fs_kHz == 16 ) {
Chris@69:                 psDec->pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
Chris@69:             } else if( fs_kHz == 12 ) {
Chris@69:                 psDec->pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
Chris@69:             } else if( fs_kHz == 8 ) {
Chris@69:                 psDec->pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
Chris@69:             } else {
Chris@69:                 /* unsupported sampling rate */
Chris@69:                 celt_assert( 0 );
Chris@69:             }
Chris@69:             psDec->first_frame_after_reset = 1;
Chris@69:             psDec->lagPrev                 = 100;
Chris@69:             psDec->LastGainIndex           = 10;
Chris@69:             psDec->prevSignalType          = TYPE_NO_VOICE_ACTIVITY;
Chris@69:             silk_memset( psDec->outBuf, 0, sizeof(psDec->outBuf));
Chris@69:             silk_memset( psDec->sLPC_Q14_buf, 0, sizeof(psDec->sLPC_Q14_buf) );
Chris@69:         }
Chris@69: 
Chris@69:         psDec->fs_kHz       = fs_kHz;
Chris@69:         psDec->frame_length = frame_length;
Chris@69:     }
Chris@69: 
Chris@69:     /* Check that settings are valid */
Chris@69:     celt_assert( psDec->frame_length > 0 && psDec->frame_length <= MAX_FRAME_LENGTH );
Chris@69: 
Chris@69:     return ret;
Chris@69: }
Chris@69: