ref: e6a4ece78f6866aa017454b5d702802406b9fd12
dir: /silk/decoder_set_fs.c/
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "main.h"
static const int dec_delay_matrix[3][5] = {
/*SILK API 8 12 16 24 48 */
/* 8 */ {3, 0, 2, 0, 0},
/*12 */ {0, 8, 5, 7, 5},
/*16 */ {0, 0, 8, 5, 5}
};
/* 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_int 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 ) {
/* Allocate worst case space for temporary upsampling, 8 to 48 kHz, so a factor 6 */
opus_int16 temp_buf[ MAX_FRAME_LENGTH_MS * MAX_API_FS_KHZ ];
silk_resampler_state_struct temp_resampler_state;
/* New delay value */
psDec->delay = dec_delay_matrix[ rateID( silk_SMULBB( fs_kHz, 1000 ) ) ][ rateID( fs_API_Hz ) ];
silk_assert( psDec->delay <= MAX_DECODER_DELAY );
if( psDec->fs_kHz != fs_kHz && psDec->fs_kHz > 0 ) {
/* Initialize resampler for temporary resampling of outBuf data to the new internal sampling rate */
ret += silk_resampler_init( &temp_resampler_state, silk_SMULBB( psDec->fs_kHz, 1000 ), silk_SMULBB( fs_kHz, 1000 ) );
/* Temporary resampling of outBuf data to the new internal sampling rate */
silk_memcpy( temp_buf, psDec->outBuf, psDec->frame_length * sizeof( opus_int16 ) );
ret += silk_resampler( &temp_resampler_state, psDec->outBuf, temp_buf, psDec->frame_length );
}
/* 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 );
/* Correct resampler state by resampling buffered data from fs_kHz to API_fs_Hz */
ret += silk_resampler( &psDec->resampler_state, temp_buf, psDec->outBuf, frame_length );
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;
}
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;
}