--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/spandsp/private/modem_connect_tones.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,105 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * private/modem_connect_tones.c - Generation and detection of tones
+ *                                 associated with modems calling and
+ *                                 answering calls.
+ *
+ * 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: modem_connect_tones.h,v 1.3 2009/11/02 13:25:20 steveu Exp $
+ */
+ 
+/*! \file */
+
+#if !defined(_SPANDSP_PRIVATE_MODEM_CONNECT_TONES_H_)
+#define _SPANDSP_PRIVATE_MODEM_CONNECT_TONES_H_
+
+/*!
+    Modem connect tones generator descriptor. This defines the state
+    of a single working instance of the tone generator.
+*/
+struct modem_connect_tones_tx_state_s
+{
+    int tone_type;
+
+    int32_t tone_phase_rate;
+    uint32_t tone_phase;
+    int16_t level;
+    /*! \brief Countdown to the next phase hop */
+    int hop_timer;
+    /*! \brief Maximum duration timer */
+    int duration_timer;
+    uint32_t mod_phase;
+    int32_t mod_phase_rate;
+    int16_t mod_level;
+};
+
+/*!
+    Modem connect tones receiver descriptor. This defines the state
+    of a single working instance of the tone detector.
+*/
+struct modem_connect_tones_rx_state_s
+{
+    /*! \brief The tone type being detected. */
+    int tone_type;
+    /*! \brief Callback routine, using to report detection of the tone. */
+    tone_report_func_t tone_callback;
+    /*! \brief An opaque pointer passed to tone_callback. */
+    void *callback_data;
+
+    /*! \brief The notch filter state. */
+    float znotch_1;
+    float znotch_2;
+    /*! \brief The 15Hz AM  filter state. */
+    float z15hz_1;
+    float z15hz_2;
+    /*! \brief The in notch power estimate */
+    int32_t notch_level;
+    /*! \brief The total channel power estimate */
+    int32_t channel_level;
+    /*! \brief The 15Hz AM power estimate */
+    int32_t am_level;
+    /*! \brief Sample counter for the small chunks of samples, after which a test is conducted. */
+    int chunk_remainder;
+    /*! \brief TRUE is the tone is currently confirmed present in the audio. */
+    int tone_present;
+    /*! \brief */
+    int tone_on;
+    /*! \brief A millisecond counter, to time the duration of tone sections. */
+    int tone_cycle_duration;
+    /*! \brief A count of the number of good cycles of tone reversal seen. */
+    int good_cycles;
+    /*! \brief TRUE if the tone has been seen since the last time the user tested for it */
+    int hit;
+    /*! \brief A V.21 FSK modem context used when searching for FAX preamble. */
+    fsk_rx_state_t v21rx;
+    /*! \brief The raw (stuffed) bit stream buffer. */
+    unsigned int raw_bit_stream;
+    /*! \brief The current number of bits in the octet in progress. */
+    int num_bits;
+    /*! \brief Number of consecutive flags seen so far. */
+    int flags_seen;
+    /*! \brief TRUE if framing OK has been announced. */
+    int framing_ok_announced;
+};
+
+#endif
+/*- End of file ------------------------------------------------------------*/