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app_mf: Add max digits option to ReceiveMF. 

Adds an option to the ReceiveMF application to allow specifying a
maximum number of digits.

Originally, this capability was not added to ReceiveMF as it was
with ReceiveSF because typically a ST digit is used to denote that
sending of digits is complete. However, there are certain signaling
protocols which simply transmit a digit (such as Expanded In-Band
Signaling) and for these, it's necessary to be able to read a
certain number of digits, as opposed to until receiving a ST digit.

This capability is added as an option, as opposed to as a parameter,
to remain compatible with existing usage (and not shift the
parameters).

ASTERISK-29877 #close

Change-Id: I4229167c9aa69b87402c3c2a9065bd8dfa973a0b
This commit is contained in:
Naveen Albert 2022-01-22 22:52:45 +00:00 committed by Friendly Automation
parent 585c2d17bb
commit 0da713168d
2 changed files with 30 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
apps/app_mf.c
View File

@ -71,6 +71,9 @@
<option name="m">
<para>Mute conference.</para>
</option>
<option name="n">
<para>Maximum number of digits, regardless of the sequence.</para>
</option>
<option name="o">
<para>Enable override. Repeated KPs will clear all previous digits.</para>
</option>
@ -179,6 +182,13 @@ enum read_option_flags {
OPT_NO_KP = (1 << 6),
OPT_NO_ST = (1 << 7),
OPT_KP_OVERRIDE = (1 << 8),
OPT_MAXDIGITS = (1 << 9),
};
enum {
OPT_ARG_MAXDIGITS,
/* Must be the last element */
OPT_ARG_ARRAY_SIZE,
};
AST_APP_OPTIONS(read_app_options, {
@ -186,6 +196,7 @@ AST_APP_OPTIONS(read_app_options, {
AST_APP_OPTION('l', OPT_LAX_KP),
AST_APP_OPTION('k', OPT_NO_KP),
AST_APP_OPTION('m', OPT_MUTE),
AST_APP_OPTION_ARG('n', OPT_MAXDIGITS, OPT_ARG_MAXDIGITS),
AST_APP_OPTION('o', OPT_KP_OVERRIDE),
AST_APP_OPTION('p', OPT_PROCESS),
AST_APP_OPTION('q', OPT_QUELCH),
@ -212,11 +223,12 @@ static const char sendmf_name[] = "SendMF";
* \param override Start over if we receive additional KPs
* \param no_kp Don't include KP in the output
* \param no_st Don't include start digits in the output
* \param maxdigits If greater than 0, only read this many digits no matter what
*
* \retval 0 if successful
* \retval -1 if unsuccessful.
*/
static int read_mf_digits(struct ast_channel *chan, char *buf, int buflen, int timeout, int features, int laxkp, int override, int no_kp, int no_st) {
static int read_mf_digits(struct ast_channel *chan, char *buf, int buflen, int timeout, int features, int laxkp, int override, int no_kp, int no_st, int maxdigits) {
struct ast_dsp *dsp;
struct ast_frame *frame = NULL;
struct timeval start;
@ -245,7 +257,7 @@ static int read_mf_digits(struct ast_channel *chan, char *buf, int buflen, int t
break;
}
}
if (digits_read >= (buflen - 1)) { /* we don't have room to store any more digits (very unlikely to happen for a legitimate reason) */
if ((maxdigits && digits_read >= maxdigits) || digits_read >= (buflen - 1)) { /* we don't have room to store any more digits (very unlikely to happen for a legitimate reason) */
/* This result will probably not be usable, so status should not be START */
pbx_builtin_setvar_helper(chan, "RECEIVEMFSTATUS", "MAXDIGITS");
break;
@ -320,8 +332,9 @@ static int read_mf_exec(struct ast_channel *chan, const char *data)
int to = 0;
double tosec;
struct ast_flags flags = {0};
char *optargs[OPT_ARG_ARRAY_SIZE];
char *argcopy = NULL;
int features = 0;
int features = 0, maxdigits = 0;
AST_DECLARE_APP_ARGS(arglist,
AST_APP_ARG(variable);
@ -339,7 +352,7 @@ static int read_mf_exec(struct ast_channel *chan, const char *data)
AST_STANDARD_APP_ARGS(arglist, argcopy);
if (!ast_strlen_zero(arglist.options)) {
ast_app_parse_options(read_app_options, &flags, NULL, arglist.options);
ast_app_parse_options(read_app_options, &flags, optargs, arglist.options);
}
if (!ast_strlen_zero(arglist.timeout)) {
@ -355,6 +368,13 @@ static int read_mf_exec(struct ast_channel *chan, const char *data)
ast_log(LOG_WARNING, "Invalid! Usage: ReceiveMF(variable[,timeout][,option])\n");
return -1;
}
if (ast_test_flag(&flags, OPT_MAXDIGITS) && !ast_strlen_zero(optargs[OPT_ARG_MAXDIGITS])) {
maxdigits = atoi(optargs[OPT_ARG_MAXDIGITS]);
if (maxdigits <= 0) {
ast_log(LOG_WARNING, "Invalid maximum number of digits, ignoring: '%s'\n", optargs[OPT_ARG_MAXDIGITS]);
maxdigits = 0;
}
}
if (ast_test_flag(&flags, OPT_DELAY)) {
features |= DSP_DIGITMODE_MUTEMAX;
@ -373,7 +393,7 @@ static int read_mf_exec(struct ast_channel *chan, const char *data)
}
read_mf_digits(chan, tmp, BUFFER_SIZE, to, features, (ast_test_flag(&flags, OPT_LAX_KP)),
(ast_test_flag(&flags, OPT_KP_OVERRIDE)), (ast_test_flag(&flags, OPT_NO_KP)), (ast_test_flag(&flags, OPT_NO_ST)));
(ast_test_flag(&flags, OPT_KP_OVERRIDE)), (ast_test_flag(&flags, OPT_NO_KP)), (ast_test_flag(&flags, OPT_NO_ST)), maxdigits);
pbx_builtin_setvar_helper(chan, arglist.variable, tmp);
if (!ast_strlen_zero(tmp)) {
ast_verb(3, "MF digits received: '%s'\n", tmp);

5
doc/CHANGES-staging/app_mf_maxdigits.txt Normal file
View File

@ -0,0 +1,5 @@
Subject: app_mf
Adds an option to ReceiveMF to cap the
number of digits read at a user-specified
maximum.