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libavcodec/ra144.h

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00001 /*
00002  * Real Audio 1.0 (14.4K)
00003  * Copyright (c) 2003 the ffmpeg project
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #ifndef AVCODEC_RA144_H
00023 #define AVCODEC_RA144_H
00024 
00025 #include <stdint.h>
00026 #include "lpc.h"
00027 
00028 #define NBLOCKS         4       ///< number of subblocks within a block
00029 #define BLOCKSIZE       40      ///< subblock size in 16-bit words
00030 #define BUFFERSIZE      146     ///< the size of the adaptive codebook
00031 #define FIXED_CB_SIZE   128     ///< size of fixed codebooks
00032 #define FRAMESIZE       20      ///< size of encoded frame
00033 #define LPC_ORDER       10      ///< order of LPC filter
00034 
00035 typedef struct {
00036     AVCodecContext *avctx;
00037     LPCContext lpc_ctx;
00038 
00039     unsigned int     old_energy;        
00040 
00041     unsigned int     lpc_tables[2][10];
00042 
00045     unsigned int    *lpc_coef[2];
00046 
00047     unsigned int     lpc_refl_rms[2];
00048 
00049     int16_t curr_block[NBLOCKS * BLOCKSIZE];
00050 
00052     int16_t curr_sblock[50];
00053 
00056     uint16_t adapt_cb[146+2];
00057 } RA144Context;
00058 
00059 void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset);
00060 int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx);
00061 void ff_eval_coefs(int *coefs, const int *refl);
00062 void ff_int_to_int16(int16_t *out, const int *inp);
00063 int ff_t_sqrt(unsigned int x);
00064 unsigned int ff_rms(const int *data);
00065 int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold,
00066               int energy);
00067 unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy);
00068 int ff_irms(const int16_t *data);
00069 void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
00070                            int cba_idx, int cb1_idx, int cb2_idx,
00071                            int gval, int gain);
00072 
00073 extern const int16_t ff_gain_val_tab[256][3];
00074 extern const uint8_t ff_gain_exp_tab[256];
00075 extern const int8_t ff_cb1_vects[128][40];
00076 extern const int8_t ff_cb2_vects[128][40];
00077 extern const uint16_t ff_cb1_base[128];
00078 extern const uint16_t ff_cb2_base[128];
00079 extern const int16_t ff_energy_tab[32];
00080 extern const int16_t * const ff_lpc_refl_cb[10];
00081 
00082 #endif /* AVCODEC_RA144_H */

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