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-rw-r--r--media/libopus/silk/decoder_set_fs.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/media/libopus/silk/decoder_set_fs.c b/media/libopus/silk/decoder_set_fs.c
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+++ b/media/libopus/silk/decoder_set_fs.c
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+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "main.h"
+
+/* Set decoder sampling rate */
+opus_int silk_decoder_set_fs(
+ silk_decoder_state *psDec, /* I/O Decoder state pointer */
+ opus_int fs_kHz, /* I Sampling frequency (kHz) */
+ opus_int32 fs_API_Hz /* I API Sampling frequency (Hz) */
+)
+{
+ opus_int frame_length, ret = 0;
+
+ silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
+ silk_assert( psDec->nb_subfr == MAX_NB_SUBFR || psDec->nb_subfr == MAX_NB_SUBFR/2 );
+
+ /* New (sub)frame length */
+ psDec->subfr_length = silk_SMULBB( SUB_FRAME_LENGTH_MS, fs_kHz );
+ frame_length = silk_SMULBB( psDec->nb_subfr, psDec->subfr_length );
+
+ /* Initialize resampler when switching internal or external sampling frequency */
+ if( psDec->fs_kHz != fs_kHz || psDec->fs_API_hz != fs_API_Hz ) {
+ /* Initialize the resampler for dec_API.c preparing resampling from fs_kHz to API_fs_Hz */
+ ret += silk_resampler_init( &psDec->resampler_state, silk_SMULBB( fs_kHz, 1000 ), fs_API_Hz, 0 );
+
+ psDec->fs_API_hz = fs_API_Hz;
+ }
+
+ if( psDec->fs_kHz != fs_kHz || frame_length != psDec->frame_length ) {
+ if( fs_kHz == 8 ) {
+ if( psDec->nb_subfr == MAX_NB_SUBFR ) {
+ psDec->pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
+ } else {
+ psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
+ }
+ } else {
+ if( psDec->nb_subfr == MAX_NB_SUBFR ) {
+ psDec->pitch_contour_iCDF = silk_pitch_contour_iCDF;
+ } else {
+ psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
+ }
+ }
+ if( psDec->fs_kHz != fs_kHz ) {
+ psDec->ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
+ if( fs_kHz == 8 || fs_kHz == 12 ) {
+ psDec->LPC_order = MIN_LPC_ORDER;
+ psDec->psNLSF_CB = &silk_NLSF_CB_NB_MB;
+ } else {
+ psDec->LPC_order = MAX_LPC_ORDER;
+ psDec->psNLSF_CB = &silk_NLSF_CB_WB;
+ }
+ if( fs_kHz == 16 ) {
+ psDec->pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
+ } else if( fs_kHz == 12 ) {
+ psDec->pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
+ } else if( fs_kHz == 8 ) {
+ psDec->pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
+ } else {
+ /* unsupported sampling rate */
+ silk_assert( 0 );
+ }
+ psDec->first_frame_after_reset = 1;
+ psDec->lagPrev = 100;
+ psDec->LastGainIndex = 10;
+ psDec->prevSignalType = TYPE_NO_VOICE_ACTIVITY;
+ silk_memset( psDec->outBuf, 0, sizeof(psDec->outBuf));
+ silk_memset( psDec->sLPC_Q14_buf, 0, sizeof(psDec->sLPC_Q14_buf) );
+ }
+
+ psDec->fs_kHz = fs_kHz;
+ psDec->frame_length = frame_length;
+ }
+
+ /* Check that settings are valid */
+ silk_assert( psDec->frame_length > 0 && psDec->frame_length <= MAX_FRAME_LENGTH );
+
+ return ret;
+}
+