Home | History | Annotate | Download | only in private
      1 /* libFLAC - Free Lossless Audio Codec library
      2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  Josh Coalson
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * - Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *
     11  * - Redistributions in binary form must reproduce the above copyright
     12  * notice, this list of conditions and the following disclaimer in the
     13  * documentation and/or other materials provided with the distribution.
     14  *
     15  * - Neither the name of the Xiph.org Foundation nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
     23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef FLAC__PRIVATE__FIXED_H
     33 #define FLAC__PRIVATE__FIXED_H
     34 
     35 #ifdef HAVE_CONFIG_H
     36 #include <config.h>
     37 #endif
     38 
     39 #include "private/float.h"
     40 #include "FLAC/format.h"
     41 
     42 /*
     43  *	FLAC__fixed_compute_best_predictor()
     44  *	--------------------------------------------------------------------
     45  *	Compute the best fixed predictor and the expected bits-per-sample
     46  *  of the residual signal for each order.  The _wide() version uses
     47  *  64-bit integers which is statistically necessary when bits-per-
     48  *  sample + log2(blocksize) > 30
     49  *
     50  *	IN data[0,data_len-1]
     51  *	IN data_len
     52  *	OUT residual_bits_per_sample[0,FLAC__MAX_FIXED_ORDER]
     53  */
     54 #ifndef FLAC__INTEGER_ONLY_LIBRARY
     55 unsigned FLAC__fixed_compute_best_predictor(const FLAC__int32 data[], unsigned data_len, FLAC__float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
     56 # ifndef FLAC__NO_ASM
     57 #  ifdef FLAC__CPU_IA32
     58 #   ifdef FLAC__HAS_NASM
     59 unsigned FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov(const FLAC__int32 data[], unsigned data_len, FLAC__float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
     60 #   endif
     61 #  endif
     62 # endif
     63 unsigned FLAC__fixed_compute_best_predictor_wide(const FLAC__int32 data[], unsigned data_len, FLAC__float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
     64 #else
     65 unsigned FLAC__fixed_compute_best_predictor(const FLAC__int32 data[], unsigned data_len, FLAC__fixedpoint residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
     66 unsigned FLAC__fixed_compute_best_predictor_wide(const FLAC__int32 data[], unsigned data_len, FLAC__fixedpoint residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
     67 #endif
     68 
     69 /*
     70  *	FLAC__fixed_compute_residual()
     71  *	--------------------------------------------------------------------
     72  *	Compute the residual signal obtained from sutracting the predicted
     73  *	signal from the original.
     74  *
     75  *	IN data[-order,data_len-1]        original signal (NOTE THE INDICES!)
     76  *	IN data_len                       length of original signal
     77  *	IN order <= FLAC__MAX_FIXED_ORDER fixed-predictor order
     78  *	OUT residual[0,data_len-1]        residual signal
     79  */
     80 void FLAC__fixed_compute_residual(const FLAC__int32 data[], unsigned data_len, unsigned order, FLAC__int32 residual[]);
     81 
     82 /*
     83  *	FLAC__fixed_restore_signal()
     84  *	--------------------------------------------------------------------
     85  *	Restore the original signal by summing the residual and the
     86  *	predictor.
     87  *
     88  *	IN residual[0,data_len-1]         residual signal
     89  *	IN data_len                       length of original signal
     90  *	IN order <= FLAC__MAX_FIXED_ORDER fixed-predictor order
     91  *	*** IMPORTANT: the caller must pass in the historical samples:
     92  *	IN  data[-order,-1]               previously-reconstructed historical samples
     93  *	OUT data[0,data_len-1]            original signal
     94  */
     95 void FLAC__fixed_restore_signal(const FLAC__int32 residual[], unsigned data_len, unsigned order, FLAC__int32 data[]);
     96 
     97 #endif
     98