1/* 2 * This source code is a product of Sun Microsystems, Inc. and is provided 3 * for unrestricted use. Users may copy or modify this source code without 4 * charge. 5 * 6 * SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING 7 * THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 8 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 9 * 10 * Sun source code is provided with no support and without any obligation on 11 * the part of Sun Microsystems, Inc. to assist in its use, correction, 12 * modification or enhancement. 13 * 14 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 15 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE 16 * OR ANY PART THEREOF. 17 * 18 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 19 * or profits or other special, indirect and consequential damages, even if 20 * Sun has been advised of the possibility of such damages. 21 * 22 * Sun Microsystems, Inc. 23 * 2550 Garcia Avenue 24 * Mountain View, California 94043 25 */ 26 27#ifndef G72X_PRIVATE_H 28#define G72X_PRIVATE_H 29 30#ifdef __cplusplus 31#error "This code is not designed to be compiled with a C++ compiler." 32#endif 33 34/* 35** The following is the definition of the state structure used by the 36** G.721/G.723 encoder and decoder to preserve their internal state 37** between successive calls. The meanings of the majority of the state 38** structure fields are explained in detail in the CCITT Recommendation 39** G.721. The field names are essentially identical to variable names 40** in the bit level description of the coding algorithm included in this 41** Recommendation. 42*/ 43 44struct g72x_state 45{ long yl ; /* Locked or steady state step size multiplier. */ 46 short yu ; /* Unlocked or non-steady state step size multiplier. */ 47 short dms ; /* Short term energy estimate. */ 48 short dml ; /* Long term energy estimate. */ 49 short ap ; /* Linear weighting coefficient of 'yl' and 'yu'. */ 50 51 short a [2] ; /* Coefficients of pole portion of prediction filter. */ 52 short b [6] ; /* Coefficients of zero portion of prediction filter. */ 53 short pk [2] ; /* 54 ** Signs of previous two samples of a partially 55 ** reconstructed signal. 56 **/ 57 short dq [6] ; /* 58 ** Previous 6 samples of the quantized difference 59 ** signal represented in an internal floating point 60 ** format. 61 **/ 62 short sr [2] ; /* 63 ** Previous 2 samples of the quantized difference 64 ** signal represented in an internal floating point 65 ** format. 66 */ 67 char td ; /* delayed tone detect, new in 1988 version */ 68 69 /* The following struct members were added for libsndfile. The original 70 ** code worked by calling a set of functions on a sample by sample basis 71 ** which is slow on architectures like Intel x86. For libsndfile, this 72 ** was changed so that the encoding and decoding routines could work on 73 ** a block of samples at a time to reduce the function call overhead. 74 */ 75 int (*encoder) (int, struct g72x_state* state) ; 76 int (*decoder) (int, struct g72x_state* state) ; 77 78 int codec_bits, blocksize, samplesperblock ; 79} ; 80 81typedef struct g72x_state G72x_STATE ; 82 83int predictor_zero (G72x_STATE *state_ptr) ; 84 85int predictor_pole (G72x_STATE *state_ptr) ; 86 87int step_size (G72x_STATE *state_ptr) ; 88 89int quantize (int d, int y, short *table, int size) ; 90 91int reconstruct (int sign, int dqln, int y) ; 92 93void update (int code_size, int y, int wi, int fi, int dq, int sr, int dqsez, G72x_STATE *state_ptr) ; 94 95int g721_encoder (int sample, G72x_STATE *state_ptr) ; 96int g721_decoder (int code, G72x_STATE *state_ptr) ; 97 98int g723_16_encoder (int sample, G72x_STATE *state_ptr) ; 99int g723_16_decoder (int code, G72x_STATE *state_ptr) ; 100 101int g723_24_encoder (int sample, G72x_STATE *state_ptr) ; 102int g723_24_decoder (int code, G72x_STATE *state_ptr) ; 103 104int g723_40_encoder (int sample, G72x_STATE *state_ptr) ; 105int g723_40_decoder (int code, G72x_STATE *state_ptr) ; 106 107void private_init_state (G72x_STATE *state_ptr) ; 108 109#if __GNUC__ 110#define ALWAYS_INLINE __attribute__ ((always_inline)) 111#elif defined _MSC_VER 112#define ALWAYS_INLINE __forceinline 113#else 114#define ALWAYS_INLINE 115#endif 116 117static inline int ALWAYS_INLINE 118arith_shift_left (int x, int shift) 119{ return (int) (((unsigned int) x) << shift) ; 120} /* arith_shift_left */ 121 122static inline int ALWAYS_INLINE 123arith_shift_right (int x, int shift) 124{ if (x >= 0) 125 return x << shift ; 126 return ~ ((~x) << shift) ; 127} /* arith_shift_right */ 128 129#endif /* G72X_PRIVATE_H */ 130