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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 FFmpeg.
  6.  *
  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.
  11.  *
  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.
  16.  *
  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
  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       ///< number of subblocks within a block
  30. #define BLOCKSIZE       40      ///< subblock size in 16-bit words
  31. #define BUFFERSIZE      146     ///< the size of the adaptive codebook
  32. #define FIXED_CB_SIZE   128     ///< size of fixed codebooks
  33. #define FRAME_SIZE      20      ///< size of encoded frame
  34. #define LPC_ORDER       10      ///< order of LPC filter
  35.  
  36. typedef struct RA144Context {
  37.     AVCodecContext *avctx;
  38.     LPCContext lpc_ctx;
  39.     AudioFrameQueue afq;
  40.     int last_frame;
  41.  
  42.     unsigned int     old_energy;        ///< previous frame energy
  43.  
  44.     unsigned int     lpc_tables[2][10];
  45.  
  46.     /** LPC coefficients: lpc_coef[0] is the coefficients of the current frame
  47.      *  and lpc_coef[1] of the previous one. */
  48.     unsigned int    *lpc_coef[2];
  49.  
  50.     unsigned int     lpc_refl_rms[2];
  51.  
  52.     int16_t curr_block[NBLOCKS * BLOCKSIZE];
  53.  
  54.     /** The current subblock padded by the last 10 values of the previous one. */
  55.     int16_t curr_sblock[50];
  56.  
  57.     /** Adaptive codebook, its size is two units bigger to avoid a
  58.      *  buffer overflow. */
  59.     int16_t adapt_cb[146+2];
  60. } RA144Context;
  61.  
  62. void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset);
  63. int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx);
  64. void ff_eval_coefs(int *coefs, const int *refl);
  65. void ff_int_to_int16(int16_t *out, const int *inp);
  66. int ff_t_sqrt(unsigned int x);
  67. unsigned int ff_rms(const int *data);
  68. int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold,
  69.               int energy);
  70. unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy);
  71. int ff_irms(const int16_t *data);
  72. void ff_subblock_synthesis(RA144Context *ractx, const int16_t *lpc_coefs,
  73.                            int cba_idx, int cb1_idx, int cb2_idx,
  74.                            int gval, int gain);
  75.  
  76. extern const int16_t ff_gain_val_tab[256][3];
  77. extern const uint8_t ff_gain_exp_tab[256];
  78. extern const int8_t ff_cb1_vects[128][40];
  79. extern const int8_t ff_cb2_vects[128][40];
  80. extern const uint16_t ff_cb1_base[128];
  81. extern const uint16_t ff_cb2_base[128];
  82. extern const int16_t ff_energy_tab[32];
  83. extern const int16_t * const ff_lpc_refl_cb[10];
  84.  
  85. #endif /* AVCODEC_RA144_H */
  86.