| /* |
| * 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 */ |