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Additional TDD changes (preparing for SIP changes - adding TDD support to SIP) 

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@89048 f38db490-d61c-443f-a65b-d21fe96a405b
This commit is contained in:
oej 2007-11-06 19:10:26 +00:00
parent 6314703e32
commit beb1ba7813
2 changed files with 27 additions and 16 deletions
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31
include/asterisk/tdd.h
View File

@ -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 */

12
main/tdd.c
View File

@ -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;