blob: 25676a326e2e2b34000bc0d2052d056043ae8e04
| 1 | /* |
| 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 |
| 7 | * |
| 8 | * This file is part of FFmpeg. |
| 9 | * |
| 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. |
| 14 | * |
| 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. |
| 19 | * |
| 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 |
| 23 | */ |
| 24 | |
| 25 | #ifndef AVCODEC_G722_H |
| 26 | #define AVCODEC_G722_H |
| 27 | |
| 28 | #include <stdint.h> |
| 29 | #include "avcodec.h" |
| 30 | #include "g722dsp.h" |
| 31 | |
| 32 | #define PREV_SAMPLES_BUF_SIZE 1024 |
| 33 | |
| 34 | typedef struct G722Context { |
| 35 | const AVClass *class; |
| 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 |
| 39 | |
| 40 | /** |
| 41 | * The band[0] and band[1] correspond respectively to the lower band and higher band. |
| 42 | */ |
| 43 | struct G722Band { |
| 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 |
| 53 | } band[2]; |
| 54 | |
| 55 | struct TrellisNode { |
| 56 | struct G722Band state; |
| 57 | uint32_t ssd; |
| 58 | int path; |
| 59 | } *node_buf[2], **nodep_buf[2]; |
| 60 | |
| 61 | struct TrellisPath { |
| 62 | int value; |
| 63 | int prev; |
| 64 | } *paths[2]; |
| 65 | |
| 66 | G722DSPContext dsp; |
| 67 | } G722Context; |
| 68 | |
| 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]; |
| 72 | |
| 73 | void ff_g722_update_low_predictor(struct G722Band *band, const int ilow); |
| 74 | |
| 75 | void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh, |
| 76 | const int ihigh); |
| 77 | |
| 78 | #endif /* AVCODEC_G722_H */ |
| 79 |