projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| e8482f24 GL |
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 | /* | |
| 28 | * g72x.h | |
| 29 | * | |
| 30 | * Header file for CCITT conversion routines. | |
| 31 | * | |
| 32 | */ | |
| 33 | #ifndef _G72X_H | |
| 34 | #define _G72X_H | |
| 35 | ||
| 36 | #define AUDIO_ENCODING_ULAW (1) /* ISDN u-law */ | |
| 37 | #define AUDIO_ENCODING_ALAW (2) /* ISDN A-law */ | |
| 38 | #define AUDIO_ENCODING_LINEAR (3) /* PCM 2's-complement (0-center) */ | |
| 39 | ||
| 40 | /* | |
| 41 | * The following is the definition of the state structure | |
| 42 | * used by the G.721/G.723 encoder and decoder to preserve their internal | |
| 43 | * state between successive calls. The meanings of the majority | |
| 44 | * of the state structure fields are explained in detail in the | |
| 45 | * CCITT Recommendation G.721. The field names are essentially indentical | |
| 46 | * to variable names in the bit level description of the coding algorithm | |
| 47 | * included in this Recommendation. | |
| 48 | */ | |
| 49 | struct g72x_state { | |
| 50 | long yl; /* Locked or steady state step size multiplier. */ | |
| 51 | short yu; /* Unlocked or non-steady state step size multiplier. */ | |
| 52 | short dms; /* Short term energy estimate. */ | |
| 53 | short dml; /* Long term energy estimate. */ | |
| 54 | short ap; /* Linear weighting coefficient of 'yl' and 'yu'. */ | |
| 55 | ||
| 56 | short a[2]; /* Coefficients of pole portion of prediction filter. */ | |
| 57 | short b[6]; /* Coefficients of zero portion of prediction filter. */ | |
| 58 | short pk[2]; /* | |
| 59 | * Signs of previous two samples of a partially | |
| 60 | * reconstructed signal. | |
| 61 | */ | |
| 62 | short dq[6]; /* | |
| 63 | * Previous 6 samples of the quantized difference | |
| 64 | * signal represented in an internal floating point | |
| 65 | * format. | |
| 66 | */ | |
| 67 | short sr[2]; /* | |
| 68 | * Previous 2 samples of the quantized difference | |
| 69 | * signal represented in an internal floating point | |
| 70 | * format. | |
| 71 | */ | |
| 72 | char td; /* delayed tone detect, new in 1988 version */ | |
| 73 | }; | |
| 74 | ||
| 75 | /* External function definitions. */ | |
| 76 | ||
| 77 | extern unsigned char linear2alaw (int pcm_val); /* 2's complement (16-bit range) */ | |
| 78 | extern int alaw2linear (unsigned char a_val); | |
| 79 | extern unsigned char linear2ulaw (int pcm_val); /* 2's complement (16-bit range) */ | |
| 80 | extern int ulaw2linear (unsigned char u_val); | |
| 81 | extern int predictor_zero (struct g72x_state *state_ptr); | |
| 82 | extern int predictor_pole (struct g72x_state *state_ptr); | |
| 83 | extern int step_size (struct g72x_state *state_ptr); | |
| 84 | extern int quantize (int d, int y, short *table, int size); | |
| 85 | extern int reconstruct (int sign, int dqln, int y); | |
| 86 | ||
| 87 | extern void update | |
| 88 | ( int code_size, int y, int wi, int fi, int dq | |
| 89 | , int sr, int dqsez, struct g72x_state *state_ptr); | |
| 90 | ||
| 91 | int tandem_adjust_alaw | |
| 92 | (int sr, int se, int y, int i, int sign, short *qtab); | |
| 93 | ||
| 94 | int tandem_adjust_ulaw | |
| 95 | (int sr, int se, int y, int i, int sign, short *qtab); | |
| 96 | ||
| 97 | extern void g72x_init_state (struct g72x_state *); | |
| 98 | extern int g721_encoder( | |
| 99 | int sample, | |
| 100 | int in_coding, | |
| 101 | struct g72x_state *state_ptr); | |
| 102 | extern int g721_decoder( | |
| 103 | int code, | |
| 104 | int out_coding, | |
| 105 | struct g72x_state *state_ptr); | |
| 106 | extern int g723_24_encoder( | |
| 107 | int sample, | |
| 108 | int in_coding, | |
| 109 | struct g72x_state *state_ptr); | |
| 110 | extern int g723_24_decoder( | |
| 111 | int code, | |
| 112 | int out_coding, | |
| 113 | struct g72x_state *state_ptr); | |
| 114 | extern int g723_40_encoder( | |
| 115 | int sample, | |
| 116 | int in_coding, | |
| 117 | struct g72x_state *state_ptr); | |
| 118 | extern int g723_40_decoder( | |
| 119 | int code, | |
| 120 | int out_coding, | |
| 121 | struct g72x_state *state_ptr); | |
| 122 | ||
| 123 | #endif /* !_G72X_H */ |