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66 lines
2.6 KiB
C
66 lines
2.6 KiB
C
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/* libFLAC - Free Lossless Audio Coder library
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* Copyright (C) 2000 Josh Coalson
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef FLAC__PRIVATE__FIXED_H
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#define FLAC__PRIVATE__FIXED_H
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#include "FLAC/format.h"
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/*
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* FLAC__fixed_compute_best_predictor()
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* --------------------------------------------------------------------
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* Compute the best fixed predictor and the expected bits-per-sample
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* of the residual signal for each order.
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*
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* IN data[0,data_len-1]
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* IN data_len
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* OUT residual_bits_per_sample[0,FLAC__MAX_FIXED_ORDER]
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*/
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unsigned FLAC__fixed_compute_best_predictor(const int32 data[], unsigned data_len, real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
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/*
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* FLAC__fixed_compute_residual()
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* --------------------------------------------------------------------
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* Compute the residual signal obtained from sutracting the predicted
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* signal from the original.
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*
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* IN data[-order,data_len-1] original signal (NOTE THE INDICES!)
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* IN data_len length of original signal
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* IN order <= FLAC__MAX_FIXED_ORDER fixed-predictor order
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* OUT residual[0,data_len-1] residual signal
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*/
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void FLAC__fixed_compute_residual(const int32 data[], unsigned data_len, unsigned order, int32 residual[]);
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/*
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* FLAC__fixed_restore_signal()
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* --------------------------------------------------------------------
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* Restore the original signal by summing the residual and the
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* predictor.
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*
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* IN residual[0,data_len-1] residual signal
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* IN data_len length of original signal
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* IN order <= FLAC__MAX_FIXED_ORDER fixed-predictor order
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* *** IMPORTANT: the caller must pass in the historical samples:
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* IN data[-order,-1] previously-reconstructed historical samples
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* OUT data[0,data_len-1] original signal
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*/
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void FLAC__fixed_restore_signal(const int32 residual[], unsigned data_len, unsigned order, int32 data[]);
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#endif
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