--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/spandsp/private/bell_r2_mf.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,104 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * bell_r2_mf.h - Bell MF and MFC/R2 tone generation and detection.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2001 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: bell_r2_mf.h,v 1.2 2008/10/13 14:19:18 steveu Exp $
+ */
+
+#if !defined(_SPANDSP_PRIVATE_BELL_R2_MF_H_)
+#define _SPANDSP_PRIVATE_BELL_R2_MF_H_
+
+/*!
+    Bell MF generator state descriptor. This defines the state of a single
+    working instance of a Bell MF generator.
+*/
+struct bell_mf_tx_state_s
+{
+    /*! The tone generator. */
+    tone_gen_state_t tones;
+    int current_sample;
+    union
+    {
+        queue_state_t queue;
+        uint8_t buf[QUEUE_STATE_T_SIZE(MAX_BELL_MF_DIGITS)];
+    } queue;
+};
+
+/*!
+    Bell MF digit detector descriptor.
+*/
+struct bell_mf_rx_state_s
+{
+    /*! Optional callback funcion to deliver received digits. */
+    digits_rx_callback_t digits_callback;
+    /*! An opaque pointer passed to the callback function. */
+    void *digits_callback_data;
+    /*! Tone detector working states */
+    goertzel_state_t out[6];
+    /*! Short term history of results from the tone detection, using in persistence checking */
+    uint8_t hits[5];
+    /*! The current sample number within a processing block. */
+    int current_sample;
+
+    /*! The number of digits which have been lost due to buffer overflows. */
+    int lost_digits;
+    /*! The number of digits currently in the digit buffer. */
+    int current_digits;
+    /*! The received digits buffer. This is a NULL terminated string. */
+    char digits[MAX_BELL_MF_DIGITS + 1];
+};
+
+/*!
+    MFC/R2 tone detector descriptor.
+*/
+struct r2_mf_tx_state_s
+{
+    /*! The tone generator. */
+    tone_gen_state_t tone;
+    /*! TRUE if generating forward tones, otherwise generating reverse tones. */
+    int fwd;
+    /*! The current digit being generated. */
+    int digit;
+};
+
+/*!
+    MFC/R2 tone detector descriptor.
+*/
+struct r2_mf_rx_state_s
+{
+    /*! Optional callback funcion to deliver received digits. */
+    tone_report_func_t callback;
+    /*! An opaque pointer passed to the callback function. */
+    void *callback_data;
+    /*! TRUE is we are detecting forward tones. FALSE if we are detecting backward tones */
+    int fwd;
+    /*! Tone detector working states */
+    goertzel_state_t out[6];
+    /*! The current sample number within a processing block. */
+    int current_sample;
+    /*! The currently detected digit. */
+    int current_digit;
+};
+
+#endif
+/*- End of file ------------------------------------------------------------*/