Version 0.1.10 from FTP

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@388 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 74 insertions, 0 deletions

diff --git a/include/asterisk/tdd.h b/include/asterisk/tdd.h
new file mode 100755
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+++ b/include/asterisk/tdd.h
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+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * TTY/TDD Generation support 
+ * 
+ * Copyright (C) 1999, Mark Spencer
+ *
+ * Mark Spencer <markster@linux-support.net>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License.
+ *
+ * Includes code and algorithms from the Zapata library.
+ *
+ */
+
+#ifndef _TDD_H
+#define _TDD_H
+
+#define	TDD_BYTES_PER_CHAR	2700
+
+struct tdd_state;
+typedef struct tdd_state TDDSTATE;
+
+//! CallerID Initialization
+/*!
+ * Initializes the TDD system.  Mostly stuff for inverse FFT
+ */
+extern void tdd_init(void);
+
+//! Generates a CallerID FSK stream in ulaw format suitable for transmission.
+/*!
+ * \param buf Buffer to use. This needs to be large enough to accomodate all the generated samples.
+ * \param string This is the string to send.
+ * This function creates a stream of TDD data in ulaw format. It returns the size
+ * (in bytes) of the data (if it returns a size of 0, there is probably an error)
+*/
+extern int tdd_generate(struct tdd_state *tdd, unsigned char *buf, char *string);
+
+//! Create a TDD state machine
+/*!
+ * This function returns a malloc'd instance of the tdd_state data structure.
+ * Returns a pointer to a malloc'd tdd_state structure, or NULL on error.
+ */
+extern struct tdd_state *tdd_new(void);
+
+//! Read samples into the state machine, and return character (if any).
+/*!
+ * \param tdd Which state machine to act upon
+ * \param buffer containing your samples
+ * \param samples number of samples contained within the buffer.
+ *
+ * Send received audio to the TDD demodulator.
+ * Returns -1 on error, 0 for "needs more samples", 
+ * and > 0 (the character) if reception of a character is complete.
+ */
+extern int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int samples);
+
+//! Free a TDD state machine
+/*!
+ * \param tdd This is the tdd_state state machine to free
+ * This function frees tdd_state tdd.
+ */
+extern void tdd_free(struct tdd_state *tdd);
+
+//! Generate Echo Canceller diable tone (2100HZ)
+/*!
+ * \param outbuf This is the buffer to receive the tone data
+ * \param len This is the length (in samples) of the tone data to generate
+ * Returns 0 if no error, and -1 if error.
+ */
+extern int ast_tdd_gen_ecdisa(unsigned char *outbuf, int len);
+
+#endif