| | 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 */ |
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