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4349 | Serge | 1 | /* |
2 | * Real Audio 1.0 (14.4K) |
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3 | * Copyright (c) 2003 the ffmpeg project |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #ifndef AVCODEC_RA144_H |
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23 | #define AVCODEC_RA144_H |
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24 | |||
25 | #include |
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26 | #include "lpc.h" |
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27 | #include "audio_frame_queue.h" |
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28 | |||
29 | #define NBLOCKS 4 ///< number of subblocks within a block |
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30 | #define BLOCKSIZE 40 ///< subblock size in 16-bit words |
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31 | #define BUFFERSIZE 146 ///< the size of the adaptive codebook |
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32 | #define FIXED_CB_SIZE 128 ///< size of fixed codebooks |
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33 | #define FRAME_SIZE 20 ///< size of encoded frame |
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34 | #define LPC_ORDER 10 ///< order of LPC filter |
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35 | |||
36 | typedef struct RA144Context { |
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37 | AVCodecContext *avctx; |
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38 | LPCContext lpc_ctx; |
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39 | AudioFrameQueue afq; |
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40 | int last_frame; |
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41 | |||
42 | unsigned int old_energy; ///< previous frame energy |
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43 | |||
44 | unsigned int lpc_tables[2][10]; |
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45 | |||
46 | /** LPC coefficients: lpc_coef[0] is the coefficients of the current frame |
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47 | * and lpc_coef[1] of the previous one. */ |
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48 | unsigned int *lpc_coef[2]; |
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49 | |||
50 | unsigned int lpc_refl_rms[2]; |
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51 | |||
52 | int16_t curr_block[NBLOCKS * BLOCKSIZE]; |
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53 | |||
54 | /** The current subblock padded by the last 10 values of the previous one. */ |
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55 | int16_t curr_sblock[50]; |
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56 | |||
57 | /** Adaptive codebook, its size is two units bigger to avoid a |
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58 | * buffer overflow. */ |
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59 | int16_t adapt_cb[146+2]; |
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60 | } RA144Context; |
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61 | |||
62 | void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset); |
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63 | int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx); |
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64 | void ff_eval_coefs(int *coefs, const int *refl); |
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65 | void ff_int_to_int16(int16_t *out, const int *inp); |
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66 | int ff_t_sqrt(unsigned int x); |
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67 | unsigned int ff_rms(const int *data); |
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68 | int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold, |
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69 | int energy); |
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70 | unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy); |
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71 | int ff_irms(const int16_t *data); |
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72 | void ff_subblock_synthesis(RA144Context *ractx, const int16_t *lpc_coefs, |
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73 | int cba_idx, int cb1_idx, int cb2_idx, |
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74 | int gval, int gain); |
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75 | |||
76 | extern const int16_t ff_gain_val_tab[256][3]; |
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77 | extern const uint8_t ff_gain_exp_tab[256]; |
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78 | extern const int8_t ff_cb1_vects[128][40]; |
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79 | extern const int8_t ff_cb2_vects[128][40]; |
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80 | extern const uint16_t ff_cb1_base[128]; |
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81 | extern const uint16_t ff_cb2_base[128]; |
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82 | extern const int16_t ff_energy_tab[32]; |
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83 | extern const int16_t * const ff_lpc_refl_cb[10]; |
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84 | |||
85 | #endif /* AVCODEC_RA144_H */>>>>>>> |