2 * Real Audio 1.0 (14.4K)
3 * Copyright (c) 2003 the ffmpeg project
5 * This file is part of FFmpeg.
7 * FFmpeg 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.
12 * FFmpeg 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #ifndef AVCODEC_RA144_H
23 #define AVCODEC_RA144_H
28 #define NBLOCKS 4 ///< number of subblocks within a block
29 #define BLOCKSIZE 40 ///< subblock size in 16-bit words
30 #define BUFFERSIZE 146 ///< the size of the adaptive codebook
31 #define FIXED_CB_SIZE 128 ///< size of fixed codebooks
32 #define FRAMESIZE 20 ///< size of encoded frame
33 #define LPC_ORDER 10 ///< order of LPC filter
36 AVCodecContext *avctx;
39 unsigned int old_energy; ///< previous frame energy
41 unsigned int lpc_tables[2][10];
43 /** LPC coefficients: lpc_coef[0] is the coefficients of the current frame
44 * and lpc_coef[1] of the previous one. */
45 unsigned int *lpc_coef[2];
47 unsigned int lpc_refl_rms[2];
49 int16_t curr_block[NBLOCKS * BLOCKSIZE];
51 /** The current subblock padded by the last 10 values of the previous one. */
52 int16_t curr_sblock[50];
54 /** Adaptive codebook, its size is two units bigger to avoid a
56 uint16_t adapt_cb[146+2];
59 void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset);
60 int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx);
61 void ff_eval_coefs(int *coefs, const int *refl);
62 void ff_int_to_int16(int16_t *out, const int *inp);
63 int ff_t_sqrt(unsigned int x);
64 unsigned int ff_rms(const int *data);
65 int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold,
67 unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy);
68 int ff_irms(const int16_t *data);
69 void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
70 int cba_idx, int cb1_idx, int cb2_idx,
73 extern const int16_t ff_gain_val_tab[256][3];
74 extern const uint8_t ff_gain_exp_tab[256];
75 extern const int8_t ff_cb1_vects[128][40];
76 extern const int8_t ff_cb2_vects[128][40];
77 extern const uint16_t ff_cb1_base[128];
78 extern const uint16_t ff_cb2_base[128];
79 extern const int16_t ff_energy_tab[32];
80 extern const int16_t * const ff_lpc_refl_cb[10];
82 #endif /* AVCODEC_RA144_H */