ref: 76f746d0617e324141268cbbec646414e95ef398
dir: /src/libflac/private/fixed.h/
/* libFLAC - Free Lossless Audio Codec library * Copyright (C) 2000-2009 Josh Coalson * Copyright (C) 2011-2016 Xiph.Org Foundation * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of the Xiph.org Foundation nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef FLAC__PRIVATE__FIXED_H #define FLAC__PRIVATE__FIXED_H #include "../private/float.h" #include "../FLAC/format.h" /* * FLAC__fixed_compute_best_predictor() * -------------------------------------------------------------------- * Compute the best fixed predictor and the expected bits-per-sample * of the residual signal for each order. The _wide() version uses * 64-bit integers which is statistically necessary when bits-per- * sample + log2(blocksize) > 30 * * IN data[0,data_len-1] * IN data_len * OUT residual_bits_per_sample[0,FLAC__MAX_FIXED_ORDER] */ uint32_t FLAC__fixed_compute_best_predictor(const FLAC__int32 data[], uint32_t data_len, float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]); uint32_t FLAC__fixed_compute_best_predictor_wide(const FLAC__int32 data[], uint32_t data_len, float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]); /* * FLAC__fixed_compute_residual() * -------------------------------------------------------------------- * Compute the residual signal obtained from sutracting the predicted * signal from the original. * * IN data[-order,data_len-1] original signal (NOTE THE INDICES!) * IN data_len length of original signal * IN order <= FLAC__MAX_FIXED_ORDER fixed-predictor order * OUT residual[0,data_len-1] residual signal */ void FLAC__fixed_compute_residual(const FLAC__int32 data[], uint32_t data_len, uint32_t order, FLAC__int32 residual[]); /* * FLAC__fixed_restore_signal() * -------------------------------------------------------------------- * Restore the original signal by summing the residual and the * predictor. * * IN residual[0,data_len-1] residual signal * IN data_len length of original signal * IN order <= FLAC__MAX_FIXED_ORDER fixed-predictor order * *** IMPORTANT: the caller must pass in the historical samples: * IN data[-order,-1] previously-reconstructed historical samples * OUT data[0,data_len-1] original signal */ void FLAC__fixed_restore_signal(const FLAC__int32 residual[], uint32_t data_len, uint32_t order, FLAC__int32 data[]); #endif