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Diffstat (limited to 'nylsf/G72x/g72x_priv.h')
| -rw-r--r-- | nylsf/G72x/g72x_priv.h | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/nylsf/G72x/g72x_priv.h b/nylsf/G72x/g72x_priv.h new file mode 100644 index 0000000..a88e96d --- /dev/null +++ b/nylsf/G72x/g72x_priv.h @@ -0,0 +1,118 @@ +/* + * This source code is a product of Sun Microsystems, Inc. and is provided + * for unrestricted use. Users may copy or modify this source code without + * charge. + * + * SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING + * THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR + * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. + * + * Sun source code is provided with no support and without any obligation on + * the part of Sun Microsystems, Inc. to assist in its use, correction, + * modification or enhancement. + * + * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE + * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE + * OR ANY PART THEREOF. + * + * In no event will Sun Microsystems, Inc. be liable for any lost revenue + * or profits or other special, indirect and consequential damages, even if + * Sun has been advised of the possibility of such damages. + * + * Sun Microsystems, Inc. + * 2550 Garcia Avenue + * Mountain View, California 94043 + */ + +#ifndef G72X_PRIVATE_H +#define G72X_PRIVATE_H + +#ifdef __cplusplus +#error "This code is not designed to be compiled with a C++ compiler." +#endif + +/* +** The following is the definition of the state structure used by the +** G.721/G.723 encoder and decoder to preserve their internal state +** between successive calls. The meanings of the majority of the state +** structure fields are explained in detail in the CCITT Recommendation +** G.721. The field names are essentially identical to variable names +** in the bit level description of the coding algorithm included in this +** Recommendation. +*/ + +struct g72x_state +{ long yl; /* Locked or steady state step size multiplier. */ + short yu; /* Unlocked or non-steady state step size multiplier. */ + short dms; /* Short term energy estimate. */ + short dml; /* Long term energy estimate. */ + short ap; /* Linear weighting coefficient of 'yl' and 'yu'. */ + + short a[2]; /* Coefficients of pole portion of prediction filter. */ + short b[6]; /* Coefficients of zero portion of prediction filter. */ + short pk[2]; /* + ** Signs of previous two samples of a partially + ** reconstructed signal. + **/ + short dq[6]; /* + ** Previous 6 samples of the quantized difference + ** signal represented in an internal floating point + ** format. + **/ + short sr[2]; /* + ** Previous 2 samples of the quantized difference + ** signal represented in an internal floating point + ** format. + */ + char td; /* delayed tone detect, new in 1988 version */ + + /* The following struct members were added for libsndfile. The original + ** code worked by calling a set of functions on a sample by sample basis + ** which is slow on architectures like Intel x86. For libsndfile, this + ** was changed so that the encoding and decoding routines could work on + ** a block of samples at a time to reduce the function call overhead. + */ + int (*encoder) (int, struct g72x_state* state) ; + int (*decoder) (int, struct g72x_state* state) ; + + int codec_bits, blocksize, samplesperblock ; +} ; + +typedef struct g72x_state G72x_STATE ; + +int predictor_zero (G72x_STATE *state_ptr); + +int predictor_pole (G72x_STATE *state_ptr); + +int step_size (G72x_STATE *state_ptr); + +int quantize (int d, int y, short *table, int size); + +int reconstruct (int sign, int dqln, int y); + +void update (int code_size, int y, int wi, int fi, int dq, int sr, int dqsez, G72x_STATE *state_ptr); + +int g721_encoder (int sample, G72x_STATE *state_ptr); +int g721_decoder (int code, G72x_STATE *state_ptr); + +int g723_16_encoder (int sample, G72x_STATE *state_ptr); +int g723_16_decoder (int code, G72x_STATE *state_ptr); + +int g723_24_encoder (int sample, G72x_STATE *state_ptr); +int g723_24_decoder (int code, G72x_STATE *state_ptr); + +int g723_40_encoder (int sample, G72x_STATE *state_ptr); +int g723_40_decoder (int code, G72x_STATE *state_ptr); + +void private_init_state (G72x_STATE *state_ptr) ; + +#endif /* G72X_PRIVATE_H */ + +/* +** Do not edit or modify anything in this comment block. +** The arch-tag line is a file identity tag for the GNU Arch +** revision control system. +** +** arch-tag: d9ad4da7-0fa3-471d-8020-720b5cfb5e5b +*/ + |