0,0 → 1,77 |
/* |
* Copyright (c) CMU 1993 Computer Science, Speech Group |
* Chengxiang Lu and Alex Hauptmann |
* Copyright (c) 2005 Steve Underwood <steveu at coppice.org> |
* Copyright (c) 2009 Kenan Gillet |
* Copyright (c) 2010 Martin Storsjo |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
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#ifndef AVCODEC_G722_H |
#define AVCODEC_G722_H |
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#include <stdint.h> |
#include "avcodec.h" |
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#define PREV_SAMPLES_BUF_SIZE 1024 |
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typedef struct G722Context { |
const AVClass *class; |
int bits_per_codeword; |
int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples |
int prev_samples_pos; ///< the number of values in prev_samples |
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/** |
* The band[0] and band[1] correspond respectively to the lower band and higher band. |
*/ |
struct G722Band { |
int16_t s_predictor; ///< predictor output value |
int32_t s_zero; ///< previous output signal from zero predictor |
int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals |
int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4) |
int16_t pole_mem[2]; ///< second-order pole section coefficient buffer |
int32_t diff_mem[6]; ///< quantizer difference signal memory |
int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer |
int16_t log_factor; ///< delayed 2-logarithmic quantizer factor |
int16_t scale_factor; ///< delayed quantizer scale factor |
} band[2]; |
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struct TrellisNode { |
struct G722Band state; |
uint32_t ssd; |
int path; |
} *node_buf[2], **nodep_buf[2]; |
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struct TrellisPath { |
int value; |
int prev; |
} *paths[2]; |
} G722Context; |
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extern const int16_t ff_g722_high_inv_quant[4]; |
extern const int16_t ff_g722_low_inv_quant4[16]; |
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, |
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 */ |