yading@10: /*
yading@10:  * Real Audio 1.0 (14.4K)
yading@10:  * Copyright (c) 2003 the ffmpeg project
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_RA144_H
yading@10: #define AVCODEC_RA144_H
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include "lpc.h"
yading@10: #include "audio_frame_queue.h"
yading@10: 
yading@10: #define NBLOCKS         4       ///< number of subblocks within a block
yading@10: #define BLOCKSIZE       40      ///< subblock size in 16-bit words
yading@10: #define BUFFERSIZE      146     ///< the size of the adaptive codebook
yading@10: #define FIXED_CB_SIZE   128     ///< size of fixed codebooks
yading@10: #define FRAMESIZE       20      ///< size of encoded frame
yading@10: #define LPC_ORDER       10      ///< order of LPC filter
yading@10: 
yading@10: typedef struct RA144Context {
yading@10:     AVCodecContext *avctx;
yading@10:     LPCContext lpc_ctx;
yading@10:     AudioFrameQueue afq;
yading@10:     int last_frame;
yading@10: 
yading@10:     unsigned int     old_energy;        ///< previous frame energy
yading@10: 
yading@10:     unsigned int     lpc_tables[2][10];
yading@10: 
yading@10:     /** LPC coefficients: lpc_coef[0] is the coefficients of the current frame
yading@10:      *  and lpc_coef[1] of the previous one. */
yading@10:     unsigned int    *lpc_coef[2];
yading@10: 
yading@10:     unsigned int     lpc_refl_rms[2];
yading@10: 
yading@10:     int16_t curr_block[NBLOCKS * BLOCKSIZE];
yading@10: 
yading@10:     /** The current subblock padded by the last 10 values of the previous one. */
yading@10:     int16_t curr_sblock[50];
yading@10: 
yading@10:     /** Adaptive codebook, its size is two units bigger to avoid a
yading@10:      *  buffer overflow. */
yading@10:     int16_t adapt_cb[146+2];
yading@10: } RA144Context;
yading@10: 
yading@10: void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset);
yading@10: int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx);
yading@10: void ff_eval_coefs(int *coefs, const int *refl);
yading@10: void ff_int_to_int16(int16_t *out, const int *inp);
yading@10: int ff_t_sqrt(unsigned int x);
yading@10: unsigned int ff_rms(const int *data);
yading@10: int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold,
yading@10:               int energy);
yading@10: unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy);
yading@10: int ff_irms(const int16_t *data);
yading@10: void ff_subblock_synthesis(RA144Context *ractx, const int16_t *lpc_coefs,
yading@10:                            int cba_idx, int cb1_idx, int cb2_idx,
yading@10:                            int gval, int gain);
yading@10: 
yading@10: extern const int16_t ff_gain_val_tab[256][3];
yading@10: extern const uint8_t ff_gain_exp_tab[256];
yading@10: extern const int8_t ff_cb1_vects[128][40];
yading@10: extern const int8_t ff_cb2_vects[128][40];
yading@10: extern const uint16_t ff_cb1_base[128];
yading@10: extern const uint16_t ff_cb2_base[128];
yading@10: extern const int16_t ff_energy_tab[32];
yading@10: extern const int16_t * const ff_lpc_refl_cb[10];
yading@10: 
yading@10: #endif /* AVCODEC_RA144_H */