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75 lines
2.8 KiB
75 lines
2.8 KiB
13 years ago
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/*
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* Copyright (c) CMU 1993 Computer Science, Speech Group
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* Chengxiang Lu and Alex Hauptmann
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* Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
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* Copyright (c) 2009 Kenan Gillet
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* Copyright (c) 2010 Martin Storsjo
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_G722_H
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#define AVCODEC_G722_H
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#include <stdint.h>
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#define PREV_SAMPLES_BUF_SIZE 1024
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typedef struct {
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int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples
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int prev_samples_pos; ///< the number of values in prev_samples
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/**
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* The band[0] and band[1] correspond respectively to the lower band and higher band.
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*/
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struct G722Band {
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int16_t s_predictor; ///< predictor output value
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int32_t s_zero; ///< previous output signal from zero predictor
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int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals
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int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4)
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int16_t pole_mem[2]; ///< second-order pole section coefficient buffer
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int32_t diff_mem[6]; ///< quantizer difference signal memory
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int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer
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int16_t log_factor; ///< delayed 2-logarithmic quantizer factor
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int16_t scale_factor; ///< delayed quantizer scale factor
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} band[2];
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struct TrellisNode {
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struct G722Band state;
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uint32_t ssd;
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int path;
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} *node_buf[2], **nodep_buf[2];
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struct TrellisPath {
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int value;
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int prev;
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} *paths[2];
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} G722Context;
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extern const int16_t ff_g722_high_inv_quant[4];
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extern const int16_t ff_g722_low_inv_quant4[16];
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extern const int16_t ff_g722_low_inv_quant6[64];
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void ff_g722_update_low_predictor(struct G722Band *band, const int ilow);
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void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh,
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const int ihigh);
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void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2);
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#endif /* AVCODEC_G722_H */
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