fixed.h (4465B)
1 /* libFLAC - Free Lossless Audio Codec library 2 * Copyright (C) 2000,2001,2002,2003,2004,2005 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