From 6519abeffcdf3555b131e4cbe67e63f4e411ba65 Mon Sep 17 00:00:00 2001
From: Olle Johansson <oej@edvina.net>
Date: Tue, 6 Nov 2007 19:10:26 +0000
Subject: Additional TDD changes (preparing for SIP changes - adding TDD
 support to SIP)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89048 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 include/asterisk/tdd.h | 31 +++++++++++++++----------------
 main/tdd.c             | 12 ++++++++++++
 2 files changed, 27 insertions(+), 16 deletions(-)

diff --git a/include/asterisk/tdd.h b/include/asterisk/tdd.h
index 47e96f190..6fb7e3e27 100644
--- a/include/asterisk/tdd.h
+++ b/include/asterisk/tdd.h
@@ -34,35 +34,29 @@ typedef struct tdd_state TDDSTATE;
  */
 void tdd_init(void);
 
-/*! 
- * \brief Generates a CallerID FSK stream in ulaw format suitable for transmission.
+/*! Generates a CallerID FSK stream in ulaw format suitable for transmission.
  * \param tdd tdd structure
  * \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. 
- * \return The size (in bytes) of the data (if it returns a size of 0, there is probably an error)
+ * 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)
 */
 int tdd_generate(struct tdd_state *tdd, unsigned char *buf, const char *string);
 
-/*! 
- * \brief Create a TDD state machine. 
+/*! Create a TDD state machine 
  * This function returns a malloc'd instance of the tdd_state data structure.
- * \retval a pointer to a malloc'd tdd_state structure
- * \retval NULL on error.
+ * Returns a pointer to a malloc'd tdd_state structure, or NULL on error.
  */
 struct tdd_state *tdd_new(void);
 
-/*! 
- * \brief Read samples into the state machine, and return character (if any).
+/*! Read samples into the state machine, and return character (if any).
  * \param tdd Which state machine to act upon
  * \param ubuf containing your samples
  * \param samples number of samples contained within the buffer.
  *
  * Send received audio to the TDD demodulator.
- * 
- * \retval -1 on error
- * \retval 0 for "needs more samples"
- * \retval > 0 (the character) if reception of a character is complete.
+ * Returns -1 on error, 0 for "needs more samples",
+ * and > 0 (the character) if reception of a character is complete.
  */
 int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int samples);
 
@@ -75,9 +69,14 @@ void tdd_free(struct tdd_state *tdd);
 /*! Generate Echo Canceller disable 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
- * \retval 0 if no error
- * \retval -1 if error.
+ * Returns 0 if no error, and -1 if error.
  */
 int ast_tdd_gen_ecdisa(unsigned char *outbuf, int len);
 
+
+/*! Generate hold tone 
+ * \param outbuf This is the buffer to receive the tone data
+*/
+int tdd_gen_holdtone(unsigned char* outbuf);
+
 #endif /* _ASTERISK_TDD_H */
diff --git a/main/tdd.c b/main/tdd.c
index c8eb93edd..0d1f7fdce 100644
--- a/main/tdd.c
+++ b/main/tdd.c
@@ -261,6 +261,18 @@ static inline float tdd_getcarrier(float *cr, float *ci, int bit)
 	PUT_TDD_STOP;	/* Stop bit */ \
 } while(0);	
 
+/*! Generate TDD hold tone */
+int tdd_gen_holdtone(unsigned char *buf)
+{
+	int bytes=0;
+	float scont=0.0,cr=1.0,ci=0.0;
+	while(scont < tddsb*10.0) {
+		PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1));
+		scont += 1.0;
+	}
+	return bytes;
+}
+
 int tdd_generate(struct tdd_state *tdd, unsigned char *buf, const char *str)
 {
 	int bytes=0;
-- 
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