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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) CMU 1993 Computer Science, Speech Group |
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| 3 | * Chengxiang Lu and Alex Hauptmann |
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| 4 | * Copyright (c) 2005 Steve Underwood |
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| 5 | * Copyright (c) 2009 Kenan Gillet |
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| 6 | * Copyright (c) 2010 Martin Storsjo |
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| 7 | * |
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| 8 | * This file is part of FFmpeg. |
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| 9 | * |
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| 10 | * FFmpeg is free software; you can redistribute it and/or |
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| 11 | * modify it under the terms of the GNU Lesser General Public |
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| 12 | * License as published by the Free Software Foundation; either |
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| 13 | * version 2.1 of the License, or (at your option) any later version. |
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| 14 | * |
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| 15 | * FFmpeg is distributed in the hope that it will be useful, |
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * Lesser General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU Lesser General Public |
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| 21 | * License along with FFmpeg; if not, write to the Free Software |
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| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |||
| 25 | #ifndef AVCODEC_G722_H |
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| 26 | #define AVCODEC_G722_H |
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| 27 | |||
| 28 | #include |
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| 29 | #include "avcodec.h" |
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| 30 | |||
| 31 | #define PREV_SAMPLES_BUF_SIZE 1024 |
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| 32 | |||
| 33 | typedef struct G722Context { |
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| 34 | const AVClass *class; |
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| 35 | int bits_per_codeword; |
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| 36 | int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples |
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| 37 | int prev_samples_pos; ///< the number of values in prev_samples |
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| 38 | |||
| 39 | /** |
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| 40 | * The band[0] and band[1] correspond respectively to the lower band and higher band. |
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| 41 | */ |
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| 42 | struct G722Band { |
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| 43 | int16_t s_predictor; ///< predictor output value |
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| 44 | int32_t s_zero; ///< previous output signal from zero predictor |
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| 45 | int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals |
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| 46 | int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4) |
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| 47 | int16_t pole_mem[2]; ///< second-order pole section coefficient buffer |
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| 48 | int32_t diff_mem[6]; ///< quantizer difference signal memory |
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| 49 | int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer |
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| 50 | int16_t log_factor; ///< delayed 2-logarithmic quantizer factor |
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| 51 | int16_t scale_factor; ///< delayed quantizer scale factor |
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| 52 | } band[2]; |
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| 53 | |||
| 54 | struct TrellisNode { |
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| 55 | struct G722Band state; |
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| 56 | uint32_t ssd; |
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| 57 | int path; |
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| 58 | } *node_buf[2], **nodep_buf[2]; |
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| 59 | |||
| 60 | struct TrellisPath { |
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| 61 | int value; |
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| 62 | int prev; |
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| 63 | } *paths[2]; |
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| 64 | } G722Context; |
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| 65 | |||
| 66 | extern const int16_t ff_g722_high_inv_quant[4]; |
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| 67 | extern const int16_t ff_g722_low_inv_quant4[16]; |
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| 68 | extern const int16_t ff_g722_low_inv_quant6[64]; |
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| 69 | |||
| 70 | void ff_g722_update_low_predictor(struct G722Band *band, const int ilow); |
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| 71 | |||
| 72 | void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh, |
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| 73 | const int ihigh); |
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| 74 | |||
| 75 | void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2); |
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| 76 | |||
| 77 | #endif /* AVCODEC_G722_H */ |