--- /dev/null
+/*
+ * 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 */
projects / Faustine.git / blobdiff