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27 #ifndef G72X_PRIVATE_H
28 #define G72X_PRIVATE_H
31 #error "This code is not designed to be compiled with a C++ compiler."
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
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'. */
51 short a[2]; /* Coefficients of pole portion of prediction filter. */
52 short b[6]; /* Coefficients of zero portion of prediction filter. */
54 ** Signs of previous two samples of a partially
55 ** reconstructed signal.
58 ** Previous 6 samples of the quantized difference
59 ** signal represented in an internal floating point
63 ** Previous 2 samples of the quantized difference
64 ** signal represented in an internal floating point
67 char td; /* delayed tone detect, new in 1988 version */
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.
75 int (*encoder) (int, struct g72x_state* state) ;
76 int (*decoder) (int, struct g72x_state* state) ;
78 int codec_bits, blocksize, samplesperblock ;
81 typedef struct g72x_state G72x_STATE ;
83 int predictor_zero (G72x_STATE *state_ptr);
85 int predictor_pole (G72x_STATE *state_ptr);
87 int step_size (G72x_STATE *state_ptr);
89 int quantize (int d, int y, short *table, int size);
91 int reconstruct (int sign, int dqln, int y);
93 void update (int code_size, int y, int wi, int fi, int dq, int sr, int dqsez, G72x_STATE *state_ptr);
95 int g721_encoder (int sample, G72x_STATE *state_ptr);
96 int g721_decoder (int code, G72x_STATE *state_ptr);
98 int g723_16_encoder (int sample, G72x_STATE *state_ptr);
99 int g723_16_decoder (int code, G72x_STATE *state_ptr);
101 int g723_24_encoder (int sample, G72x_STATE *state_ptr);
102 int g723_24_decoder (int code, G72x_STATE *state_ptr);
104 int g723_40_encoder (int sample, G72x_STATE *state_ptr);
105 int g723_40_decoder (int code, G72x_STATE *state_ptr);
107 void private_init_state (G72x_STATE *state_ptr) ;
109 #endif /* G72X_PRIVATE_H */
112 ** Do not edit or modify anything in this comment block.
113 ** The arch-tag line is a file identity tag for the GNU Arch
114 ** revision control system.
116 ** arch-tag: d9ad4da7-0fa3-471d-8020-720b5cfb5e5b