ref: 8fec416b7dd479b8b7c34b63b3ab4dbcf7abcdca
dir: /silk/decoder_set_fs.c/
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#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;
}