Update CONTROL STREAM FILE to accept an 'offsetms' parameter

This patch allows starting playback of audio through the CONTROL STREAM FILE
AGI command to start at a particular offset. It will also return the final
position of the file in the 'endpos' attribute.

(closes issue ASTERISK-17803)
Reported by: Murray Melvin
patches:
  res_agi.c.r316293.diff uploaded by murraytm (license 6221)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@395906 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -305,6 +305,10 @@ AGI (Asterisk Gateway Interface)
  * The manager event AsyncAGI has been split into AsyncAGIStart, AsyncAGIExec,
    and AsyncAGIEnd.
 
+ * The CONTROL STREAM FILE command now accepts an offsetms parameter. This
+   will start the playback of the audio at the position specified. It will
+   also return the final position of the file in 'endpos'.
+
 CDR (Call Detail Records)
 ------------------
  * Significant changes have been made to the behavior of CDRs. For a full

res/res_agi.c

@@ -155,13 +155,19 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 				<para>Defaults to <literal>#</literal></para>
 			</parameter>
 			<parameter name="pausechr" />
+			<parameter name="offsetms">
+				<para>Offset, in milliseconds, to start the audio playback</para>
+			</parameter>
 		</syntax>
 		<description>
 			<para>Send the given file, allowing playback to be controlled by the given
 			digits, if any. Use double quotes for the digits if you wish none to be
-			permitted. Returns <literal>0</literal> if playback completes without a digit
+			permitted. If offsetms is provided then the audio will seek to offsetms
+			before play starts. Returns <literal>0</literal> if playback completes without a digit
 			being pressed, or the ASCII numerical value of the digit if one was pressed,
-			or <literal>-1</literal> on error or if the channel was disconnected.</para>
+			or <literal>-1</literal> on error or if the channel was disconnected. Returns the
+			position where playback was terminated as endpos.</para>
+
 			<para>It sets the following channel variables upon completion:</para>
 			<variablelist>
 				<variable name="CPLAYBACKSTATUS">
@@ -2092,7 +2098,7 @@ static int handle_controlstreamfile(struct ast_channel *chan, AGI *agi, int argc
 	long offsetms = 0;
 	char offsetbuf[20];
 
-	if (argc < 5 || argc > 9) {
+	if (argc < 5 || argc > 10) {
 		return RESULT_SHOWUSAGE;
 	}
 
@@ -2116,7 +2122,11 @@ static int handle_controlstreamfile(struct ast_channel *chan, AGI *agi, int argc
 		suspend = argv[8];
 	}
 
-	res = ast_control_streamfile(chan, argv[3], fwd, rev, stop, suspend, NULL, skipms, NULL);
+	if (argc > 9 && (sscanf(argv[9], "%30ld", &offsetms) != 1)) {
+		return RESULT_SHOWUSAGE;
+	}
+
+	res = ast_control_streamfile(chan, argv[3], fwd, rev, stop, suspend, NULL, skipms, &offsetms);
 
 	/* If we stopped on one of our stop keys, return 0  */
 	if (res > 0 && stop && strchr(stop, res)) {
@@ -2137,7 +2147,7 @@ static int handle_controlstreamfile(struct ast_channel *chan, AGI *agi, int argc
 	snprintf(offsetbuf, sizeof(offsetbuf), "%ld", offsetms);
 	pbx_builtin_setvar_helper(chan, "CPLAYBACKOFFSET", offsetbuf);
 
-	ast_agi_send(agi->fd, chan, "200 result=%d\n", res);
+	ast_agi_send(agi->fd, chan, "200 result=%d endpos=%ld\n", res, offsetms);
 
 	return (res >= 0) ? RESULT_SUCCESS : RESULT_FAILURE;
 }