ra144.h
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1 /*
2  * Real Audio 1.0 (14.4K)
3  * Copyright (c) 2003 the ffmpeg project
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef AVCODEC_RA144_H
23 #define AVCODEC_RA144_H
24 
25 #include <stdint.h>
26 #include "lpc.h"
27 #include "audio_frame_queue.h"
28 
29 #define NBLOCKS 4
30 #define BLOCKSIZE 40
31 #define BUFFERSIZE 146
32 #define FIXED_CB_SIZE 128
33 #define FRAMESIZE 20
34 #define LPC_ORDER 10
35 
36 typedef struct RA144Context {
42 
43  unsigned int old_energy;
44 
45  unsigned int lpc_tables[2][10];
46 
49  unsigned int *lpc_coef[2];
50 
51  unsigned int lpc_refl_rms[2];
52 
54 
56  int16_t curr_sblock[50];
57 
60  uint16_t adapt_cb[146+2];
61 } RA144Context;
62 
63 void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset);
64 int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx);
65 void ff_eval_coefs(int *coefs, const int *refl);
66 void ff_int_to_int16(int16_t *out, const int *inp);
67 int ff_t_sqrt(unsigned int x);
68 unsigned int ff_rms(const int *data);
69 int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold,
70  int energy);
71 unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy);
72 int ff_irms(const int16_t *data);
73 void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
74  int cba_idx, int cb1_idx, int cb2_idx,
75  int gval, int gain);
76 
77 extern const int16_t ff_gain_val_tab[256][3];
78 extern const uint8_t ff_gain_exp_tab[256];
79 extern const int8_t ff_cb1_vects[128][40];
80 extern const int8_t ff_cb2_vects[128][40];
81 extern const uint16_t ff_cb1_base[128];
82 extern const uint16_t ff_cb2_base[128];
83 extern const int16_t ff_energy_tab[32];
84 extern const int16_t * const ff_lpc_refl_cb[10];
85 
86 #endif /* AVCODEC_RA144_H */