X-Git-Url: https://scm.cri.ensmp.fr/git/Faustine.git/blobdiff_plain/e5b0e8bee502e61dfaaf2a5bc4b4d9d4938a9a2a..e775f23a10c4ba37fc1a762299f52cd0d71593b7:/interpretor/libsndfile-1.0.25/src/G72x/g72x_priv.h

diff --git a/interpretor/libsndfile-1.0.25/src/G72x/g72x_priv.h b/interpretor/libsndfile-1.0.25/src/G72x/g72x_priv.h
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+/*
+ * 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 */