1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002 Josh Coalson
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 #ifndef FLAC__PRIVATE__FIXED_H
21 #define FLAC__PRIVATE__FIXED_H
23 #include "FLAC/format.h"
26 * FLAC__fixed_compute_best_predictor()
27 * --------------------------------------------------------------------
28 * Compute the best fixed predictor and the expected bits-per-sample
29 * of the residual signal for each order. The _wide() version uses
30 * 64-bit integers which is statistically necessary when bits-per-
31 * sample + log2(blocksize) > 30
33 * IN data[0,data_len-1]
35 * OUT residual_bits_per_sample[0,FLAC__MAX_FIXED_ORDER]
37 unsigned FLAC__fixed_compute_best_predictor(const FLAC__int32 data[], unsigned data_len, FLAC__real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
41 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]);
45 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]);
48 * FLAC__fixed_compute_residual()
49 * --------------------------------------------------------------------
50 * Compute the residual signal obtained from sutracting the predicted
51 * signal from the original.
53 * IN data[-order,data_len-1] original signal (NOTE THE INDICES!)
54 * IN data_len length of original signal
55 * IN order <= FLAC__MAX_FIXED_ORDER fixed-predictor order
56 * OUT residual[0,data_len-1] residual signal
58 void FLAC__fixed_compute_residual(const FLAC__int32 data[], unsigned data_len, unsigned order, FLAC__int32 residual[]);
61 * FLAC__fixed_restore_signal()
62 * --------------------------------------------------------------------
63 * Restore the original signal by summing the residual and the
66 * IN residual[0,data_len-1] residual signal
67 * IN data_len length of original signal
68 * IN order <= FLAC__MAX_FIXED_ORDER fixed-predictor order
69 * *** IMPORTANT: the caller must pass in the historical samples:
70 * IN data[-order,-1] previously-reconstructed historical samples
71 * OUT data[0,data_len-1] original signal
73 void FLAC__fixed_restore_signal(const FLAC__int32 residual[], unsigned data_len, unsigned order, FLAC__int32 data[]);