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185 lines
9.3 KiB
C
185 lines
9.3 KiB
C
/* 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__LPC_H
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#define FLAC__PRIVATE__LPC_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__lpc_compute_autocorrelation()
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* --------------------------------------------------------------------
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* Compute the autocorrelation for lags between 0 and lag-1.
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* Assumes data[] outside of [0,data_len-1] == 0.
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* Asserts that lag > 0.
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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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* IN 0 < lag <= data_len
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* OUT autoc[0,lag-1]
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*/
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void FLAC__lpc_compute_autocorrelation(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
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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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void FLAC__lpc_compute_autocorrelation_asm_ia32(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
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void FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_4(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
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void FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_8(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
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void FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_12(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
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void FLAC__lpc_compute_autocorrelation_asm_ia32_3dnow(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
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#endif
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#endif
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#endif
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/*
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* FLAC__lpc_compute_lp_coefficients()
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* --------------------------------------------------------------------
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* Computes LP coefficients for orders 1..max_order.
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* Do not call if autoc[0] == 0.0. This means the signal is zero
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* and there is no point in calculating a predictor.
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*
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* IN autoc[0,max_order] autocorrelation values
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* IN 0 < max_order <= FLAC__MAX_LPC_ORDER max LP order to compute
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* OUT lp_coeff[0,max_order-1][0,max_order-1] LP coefficients for each order
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* *** IMPORTANT:
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* *** lp_coeff[0,max_order-1][max_order,FLAC__MAX_LPC_ORDER-1] are untouched
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* OUT error[0,max_order-1] error for each order
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*
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* Example: if max_order is 9, the LP coefficients for order 9 will be
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* in lp_coeff[8][0,8], the LP coefficients for order 8 will be
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* in lp_coeff[7][0,7], etc.
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*/
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void FLAC__lpc_compute_lp_coefficients(const FLAC__real autoc[], unsigned max_order, FLAC__real lp_coeff[][FLAC__MAX_LPC_ORDER], FLAC__real error[]);
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/*
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* FLAC__lpc_quantize_coefficients()
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* --------------------------------------------------------------------
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* Quantizes the LP coefficients. NOTE: precision + bits_per_sample
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* must be less than 32 (sizeof(FLAC__int32)*8).
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*
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* IN lp_coeff[0,order-1] LP coefficients
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* IN order LP order
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* IN FLAC__MIN_QLP_COEFF_PRECISION < precision
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* desired precision (in bits, including sign
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* bit) of largest coefficient
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* OUT qlp_coeff[0,order-1] quantized coefficients
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* OUT shift # of bits to shift right to get approximated
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* LP coefficients. NOTE: could be negative.
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* RETURN 0 => quantization OK
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* 1 => coefficients require too much shifting for *shift to
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* fit in the LPC subframe header. 'shift' is unset.
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* 2 => coefficients are all zero, which is bad. 'shift' is
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* unset.
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*/
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int FLAC__lpc_quantize_coefficients(const FLAC__real lp_coeff[], unsigned order, unsigned precision, FLAC__int32 qlp_coeff[], int *shift);
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/*
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* FLAC__lpc_compute_residual_from_qlp_coefficients()
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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 qlp_coeff[0,order-1] quantized LP coefficients
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* IN order > 0 LP order
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* IN lp_quantization quantization of LP coefficients in bits
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* OUT residual[0,data_len-1] residual signal
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*/
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void FLAC__lpc_compute_residual_from_qlp_coefficients(const FLAC__int32 data[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
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void FLAC__lpc_compute_residual_from_qlp_coefficients_wide(const FLAC__int32 data[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
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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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void FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32(const FLAC__int32 data[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
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void FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx(const FLAC__int32 data[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
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#endif
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#endif
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#endif
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/*
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* FLAC__lpc_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 qlp_coeff[0,order-1] quantized LP coefficients
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* IN order > 0 LP order
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* IN lp_quantization quantization of LP coefficients in bits
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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__lpc_restore_signal(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
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void FLAC__lpc_restore_signal_wide(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
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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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void FLAC__lpc_restore_signal_asm_ia32(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
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void FLAC__lpc_restore_signal_asm_ia32_mmx(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
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#endif
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#endif
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#endif
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/*
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* FLAC__lpc_compute_expected_bits_per_residual_sample()
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* --------------------------------------------------------------------
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* Compute the expected number of bits per residual signal sample
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* based on the LP error (which is related to the residual variance).
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*
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* IN lpc_error >= 0.0 error returned from calculating LP coefficients
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* IN total_samples > 0 # of samples in residual signal
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* RETURN expected bits per sample
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*/
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FLAC__real FLAC__lpc_compute_expected_bits_per_residual_sample(FLAC__real lpc_error, unsigned total_samples);
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FLAC__real FLAC__lpc_compute_expected_bits_per_residual_sample_with_error_scale(FLAC__real lpc_error, double error_scale);
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/*
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* FLAC__lpc_compute_best_order()
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* --------------------------------------------------------------------
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* Compute the best order from the array of signal errors returned
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* during coefficient computation.
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*
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* IN lpc_error[0,max_order-1] >= 0.0 error returned from calculating LP coefficients
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* IN max_order > 0 max LP order
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* IN total_samples > 0 # of samples in residual signal
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* IN bits_per_signal_sample # of bits per sample in the original signal
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* RETURN [1,max_order] best order
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*/
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unsigned FLAC__lpc_compute_best_order(const FLAC__real lpc_error[], unsigned max_order, unsigned total_samples, unsigned bits_per_signal_sample);
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#endif
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