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76 lines
2.9 KiB
76 lines
2.9 KiB
/* |
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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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#include "avcodec.h" |
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#define PREV_SAMPLES_BUF_SIZE 1024 |
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typedef struct { |
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AVFrame frame; |
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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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