/* * 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 Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_G722_H #define AVCODEC_G722_H #include <stdint.h> #include "avcodec.h" #define PREV_SAMPLES_BUF_SIZE 1024 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 /** * 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]; struct TrellisNode { struct G722Band state; uint32_t ssd; int path; } *node_buf[2], **nodep_buf[2]; struct TrellisPath { int value; int prev; } *paths[2]; } G722Context; 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]; void ff_g722_update_low_predictor(struct G722Band *band, const int ilow); void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh, const int ihigh); void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2); #endif /* AVCODEC_G722_H */