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92 lines
4 KiB
C
92 lines
4 KiB
C
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/* libFLAC - Free Lossless Audio Codec library
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* Copyright (C) 2000,2001,2002,2003 Josh Coalson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of the Xiph.org Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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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. The _wide() version uses
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* 64-bit integers which is statistically necessary when bits-per-
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* sample + log2(blocksize) > 30
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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 FLAC__int32 data[], unsigned data_len, FLAC__real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
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#ifndef FLAC__NO_ASM
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#ifdef FLAC__CPU_IA32
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#ifdef FLAC__HAS_NASM
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unsigned FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov(const FLAC__int32 data[], unsigned data_len, FLAC__real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
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#endif
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#endif
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#endif
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unsigned FLAC__fixed_compute_best_predictor_wide(const FLAC__int32 data[], unsigned data_len, FLAC__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 FLAC__int32 data[], unsigned data_len, unsigned order, FLAC__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 FLAC__int32 residual[], unsigned data_len, unsigned order, FLAC__int32 data[]);
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#endif
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