opus_int silk_setup_resamplers( silk_encoder_state_Fxx *psEnc, /* I/O */ opus_int fs_kHz /* I */ ) { opus_int ret = SILK_NO_ERROR; opus_int32 nSamples_temp; if( psEnc->sCmn.fs_kHz != fs_kHz || psEnc->sCmn.prev_API_fs_Hz != psEnc->sCmn.API_fs_Hz ) { if( psEnc->sCmn.fs_kHz == 0 ) { /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */ ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, fs_kHz * 1000, 1 ); } else { /* Allocate worst case space for temporary upsampling, 8 to 48 kHz, so a factor 6 */ opus_int16 x_buf_API_fs_Hz[ ( 2 * MAX_FRAME_LENGTH_MS + LA_SHAPE_MS ) * MAX_API_FS_KHZ ]; silk_resampler_state_struct temp_resampler_state; #ifdef FIXED_POINT opus_int16 *x_bufFIX = psEnc->x_buf; #else opus_int16 x_bufFIX[ 2 * MAX_FRAME_LENGTH + LA_SHAPE_MAX ]; #endif nSamples_temp = silk_LSHIFT( psEnc->sCmn.frame_length, 1 ) + LA_SHAPE_MS * psEnc->sCmn.fs_kHz; #ifndef FIXED_POINT silk_float2short_array( x_bufFIX, psEnc->x_buf, nSamples_temp ); #endif /* Initialize resampler for temporary resampling of x_buf data to API_fs_Hz */ ret += silk_resampler_init( &temp_resampler_state, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ), psEnc->sCmn.API_fs_Hz, 0 ); /* Temporary resampling of x_buf data to API_fs_Hz */ ret += silk_resampler( &temp_resampler_state, x_buf_API_fs_Hz, x_bufFIX, nSamples_temp ); /* Calculate number of samples that has been temporarily upsampled */ nSamples_temp = silk_DIV32_16( nSamples_temp * psEnc->sCmn.API_fs_Hz, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ) ); /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */ ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, silk_SMULBB( fs_kHz, 1000 ), 1 ); /* Correct resampler state by resampling buffered data from API_fs_Hz to fs_kHz */ ret += silk_resampler( &psEnc->sCmn.resampler_state, x_bufFIX, x_buf_API_fs_Hz, nSamples_temp ); #ifndef FIXED_POINT silk_short2float_array( psEnc->x_buf, x_bufFIX, ( 2 * MAX_FRAME_LENGTH_MS + LA_SHAPE_MS ) * fs_kHz ); #endif } } psEnc->sCmn.prev_API_fs_Hz = psEnc->sCmn.API_fs_Hz; return ret; }
static opus_int silk_setup_resamplers( silk_encoder_state_Fxx *psEnc, /* I/O */ opus_int fs_kHz /* I */ ) { opus_int ret = SILK_NO_ERROR; SAVE_STACK; if( psEnc->sCmn.fs_kHz != fs_kHz || psEnc->sCmn.prev_API_fs_Hz != psEnc->sCmn.API_fs_Hz ) { if( psEnc->sCmn.fs_kHz == 0 ) { /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */ ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, fs_kHz * 1000, 1 ); } else { VARDECL( opus_int16, x_buf_API_fs_Hz ); VARDECL( silk_resampler_state_struct, temp_resampler_state ); #ifdef OPUS_FIXED_POINT opus_int16 *x_bufFIX = psEnc->x_buf; #else VARDECL( opus_int16, x_bufFIX ); opus_int32 new_buf_samples; #endif opus_int32 api_buf_samples; opus_int32 old_buf_samples; opus_int32 buf_length_ms; buf_length_ms = silk_LSHIFT( psEnc->sCmn.nb_subfr * 5, 1 ) + LA_SHAPE_MS; old_buf_samples = buf_length_ms * psEnc->sCmn.fs_kHz; #ifndef OPUS_FIXED_POINT new_buf_samples = buf_length_ms * fs_kHz; ALLOC( x_bufFIX, silk_max( old_buf_samples, new_buf_samples ), opus_int16 ); silk_float2short_array( x_bufFIX, psEnc->x_buf, old_buf_samples ); #endif /* Initialize resampler for temporary resampling of x_buf data to API_fs_Hz */ ALLOC( temp_resampler_state, 1, silk_resampler_state_struct ); ret += silk_resampler_init( temp_resampler_state, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ), psEnc->sCmn.API_fs_Hz, 0 ); /* Calculate number of samples to temporarily upsample */ api_buf_samples = buf_length_ms * silk_DIV32_16( psEnc->sCmn.API_fs_Hz, 1000 ); /* Temporary resampling of x_buf data to API_fs_Hz */ ALLOC( x_buf_API_fs_Hz, api_buf_samples, opus_int16 ); ret += silk_resampler( temp_resampler_state, x_buf_API_fs_Hz, x_bufFIX, old_buf_samples ); /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */ ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, silk_SMULBB( fs_kHz, 1000 ), 1 ); /* Correct resampler state by resampling buffered data from API_fs_Hz to fs_kHz */ ret += silk_resampler( &psEnc->sCmn.resampler_state, x_bufFIX, x_buf_API_fs_Hz, api_buf_samples ); #ifndef OPUS_FIXED_POINT silk_short2float_array( psEnc->x_buf, x_bufFIX, new_buf_samples); #endif } } psEnc->sCmn.prev_API_fs_Hz = psEnc->sCmn.API_fs_Hz; RESTORE_STACK; return ret; }
/* 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 ) { /* 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; }