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
27 #include "audio_frame_queue.h"
30 #define NBLOCKS 4 ///< number of subblocks within a block
31 #define BLOCKSIZE 40 ///< subblock size in 16-bit words
32 #define BUFFERSIZE 146 ///< the size of the adaptive codebook
33 #define FIXED_CB_SIZE 128 ///< size of fixed codebooks
34 #define FRAME_SIZE 20 ///< size of encoded frame
35 #define LPC_ORDER 10 ///< order of LPC filter
37 typedef struct RA144Context
{
38 AVCodecContext
*avctx
;
44 unsigned int old_energy
; ///< previous frame energy
46 unsigned int lpc_tables
[2][10];
48 /** LPC coefficients: lpc_coef[0] is the coefficients of the current frame
49 * and lpc_coef[1] of the previous one. */
50 unsigned int *lpc_coef
[2];
52 unsigned int lpc_refl_rms
[2];
54 int16_t curr_block
[NBLOCKS
* BLOCKSIZE
];
56 /** The current subblock padded by the last 10 values of the previous one. */
57 int16_t curr_sblock
[50];
59 /** Adaptive codebook, its size is two units bigger to avoid a
61 int16_t adapt_cb
[146+2];
63 DECLARE_ALIGNED(16, int16_t, buffer_a
)[FFALIGN(BLOCKSIZE
,16)];
66 void ff_copy_and_dup(int16_t *target
, const int16_t *source
, int offset
);
67 int ff_eval_refl(int *refl
, const int16_t *coefs
, AVCodecContext
*avctx
);
68 void ff_eval_coefs(int *coefs
, const int *refl
);
69 void ff_int_to_int16(int16_t *out
, const int *inp
);
70 int ff_t_sqrt(unsigned int x
);
71 unsigned int ff_rms(const int *data
);
72 int ff_interp(RA144Context
*ractx
, int16_t *out
, int a
, int copyold
,
74 unsigned int ff_rescale_rms(unsigned int rms
, unsigned int energy
);
75 int ff_irms(AudioDSPContext
*adsp
, const int16_t *data
/*align 16*/);
76 void ff_subblock_synthesis(RA144Context
*ractx
, const int16_t *lpc_coefs
,
77 int cba_idx
, int cb1_idx
, int cb2_idx
,
80 extern const int16_t ff_gain_val_tab
[256][3];
81 extern const uint8_t ff_gain_exp_tab
[256];
82 extern const int8_t ff_cb1_vects
[128][40];
83 extern const int8_t ff_cb2_vects
[128][40];
84 extern const uint16_t ff_cb1_base
[128];
85 extern const uint16_t ff_cb2_base
[128];
86 extern const int16_t ff_energy_tab
[32];
87 extern const int16_t * const ff_lpc_refl_cb
[10];
89 #endif /* AVCODEC_RA144_H */