2 * Copyright (c) CMU 1993 Computer Science, Speech Group
3 * Chengxiang Lu and Alex Hauptmann
4 * Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
5 * Copyright (c) 2009 Kenan Gillet
6 * Copyright (c) 2010 Martin Storsjo
8 * This file is part of FFmpeg.
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #ifndef AVCODEC_G722_H
26 #define AVCODEC_G722_H
32 #define PREV_SAMPLES_BUF_SIZE 1024
34 typedef struct G722Context {
36 int bits_per_codeword;
37 int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples
38 int prev_samples_pos; ///< the number of values in prev_samples
41 * The band[0] and band[1] correspond respectively to the lower band and higher band.
44 int16_t s_predictor; ///< predictor output value
45 int32_t s_zero; ///< previous output signal from zero predictor
46 int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals
47 int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4)
48 int16_t pole_mem[2]; ///< second-order pole section coefficient buffer
49 int32_t diff_mem[6]; ///< quantizer difference signal memory
50 int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer
51 int16_t log_factor; ///< delayed 2-logarithmic quantizer factor
52 int16_t scale_factor; ///< delayed quantizer scale factor
56 struct G722Band state;
59 } *node_buf[2], **nodep_buf[2];
69 extern const int16_t ff_g722_high_inv_quant[4];
70 extern const int16_t ff_g722_low_inv_quant4[16];
71 extern const int16_t ff_g722_low_inv_quant6[64];
73 void ff_g722_update_low_predictor(struct G722Band *band, const int ilow);
75 void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh,
78 #endif /* AVCODEC_G722_H */