--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/spandsp/private/g726.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,87 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * private/g726.h - ITU G.726 codec.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2006 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: g726.h,v 1.4 2009/04/12 09:12:11 steveu Exp $
+ */
+
+#if !defined(_SPANDSP_PRIVATE_G726_H_)
+#define _SPANDSP_PRIVATE_G726_H_
+
+/*!
+ * The following is the definition of the state structure
+ * used by the G.726 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
+ * ITU Recommendation G.726.  The field names are essentially indentical
+ * to variable names in the bit level description of the coding algorithm
+ * included in this recommendation.
+ */
+struct g726_state_s
+{
+    /*! The bit rate */
+    int rate;
+    /*! The external coding, for tandem operation */
+    int ext_coding;
+    /*! The number of bits per sample */
+    int bits_per_sample;
+    /*! One of the G.726_PACKING_xxx options */
+    int packing;
+
+    /*! Locked or steady state step size multiplier. */
+    int32_t yl;
+    /*! Unlocked or non-steady state step size multiplier. */
+    int16_t yu;
+    /*! int16_t term energy estimate. */
+    int16_t dms;
+    /*! Long term energy estimate. */
+    int16_t dml;
+    /*! Linear weighting coefficient of 'yl' and 'yu'. */
+    int16_t ap;
+    
+    /*! Coefficients of pole portion of prediction filter. */
+    int16_t a[2];
+    /*! Coefficients of zero portion of prediction filter. */
+    int16_t b[6];
+    /*! Signs of previous two samples of a partially reconstructed signal. */
+    int16_t pk[2];
+    /*! Previous 6 samples of the quantized difference signal represented in
+        an internal floating point format. */
+    int16_t dq[6];
+    /*! Previous 2 samples of the quantized difference signal represented in an
+        internal floating point format. */
+    int16_t sr[2];
+    /*! Delayed tone detect */
+    int td;
+    
+    /*! \brief The bit stream processing context. */
+    bitstream_state_t bs;
+
+    /*! \brief The current encoder function. */
+    g726_encoder_func_t enc_func;
+    /*! \brief The current decoder function. */
+    g726_decoder_func_t dec_func;
+};
+
+#endif
+/*- End of file ------------------------------------------------------------*/