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Small Cisco's RTP DTMF update

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43546 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Paul Cadach
2006-09-24 12:15:49 +00:00
parent 56fb349222
commit 04cf782862
1 changed files with 5 additions and 12 deletions
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17
main/rtp.c
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@@ -605,8 +605,7 @@ static struct ast_frame *process_cisco_dtmf(struct ast_rtp *rtp, unsigned char *
char resp = 0;
struct ast_frame *f = NULL;
unsigned char seq;
unsigned int datalen;
unsigned int flag;
unsigned int flags;
unsigned int power;
/* We should have at least 4 bytes in RTP data */
@@ -616,14 +615,9 @@ static struct ast_frame *process_cisco_dtmf(struct ast_rtp *rtp, unsigned char *
/* The format of Cisco RTP DTMF packet looks like next:
+0 - sequence number of DTMF RTP packet (begins from 1,
wrapped to 0)
+1 (bits 7-0) - count of bytes carrying DTMF information (if DTMF
information repeates 3 times, i.e. packet have 6
bytes of DTMF information, this value equal to 6).
Last bit should always be zero (because DTMF info
is multiple of 2 bytes) but really uses as described
below.
+1 - set of flags
+1 (bit 0) - flaps by different DTMF digits delimited by audio
or repeated digit without audio
or repeated digit without audio???
+2 (+4,+6,...) - power level? (rises from 0 to 32 at begin of tone
then falls to 0 at its end)
+3 (+5,+7,...) - detected DTMF digit (0..9,*,#,A-D,...)
@@ -649,13 +643,12 @@ static struct ast_frame *process_cisco_dtmf(struct ast_rtp *rtp, unsigned char *
*/
seq = data[0];
datalen = data[1] & ~1;
flag = data[1] & 1;
flags = data[1];
power = data[2];
event = data[3] & 0x1f;
if (option_debug > 2 || rtpdebug)
ast_log(LOG_DEBUG, "Cisco DTMF Digit: %02x (len=%d, seq=%d, repeat=%d, power=%d, history count=%d)\n", event, len, seq, flag, power, datalen / 2 - 1);
ast_log(LOG_DEBUG, "Cisco DTMF Digit: %02x (len=%d, seq=%d, flags=%02x, power=%d, history count=%d)\n", event, len, seq, flags, power, (len - 4) / 2);
if (event < 10) {
resp = '0' + event;
} else if (event < 11) {