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res_musiconhold.c: Restart MOH if previous hold just reached end-of-file

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On MOH activation, moh_files_readframe() is called while the current
stream attached to the channel is NULL and it calls ast_moh_files_next()
immediately.  However, it won't call ast_moh_files_next() again if sample
reading fails.  The failure may occur because res_musiconhold retains the
last sample reading position in the channel data and MOH during the
previous hold/retrieve just reached EOF.  Obviously, a bit of bad luck is
required here.

* Restructured moh_files_readframe() to try a second time to start MOH if
there was no stream setup and the saved position was at EOF.  Also added
comments describing what is going on for each step.

ASTERISK-28029

Change-Id: I1508cf2c094f8feca22d6f76deaa9fdfa9944860
This commit is contained in:
Frederic LE FOLL
2018-08-30 10:42:18 +02:00
committed by Richard Mudgett
parent 29d4109b3c
commit 35e02d6f17
1 changed files with 20 additions and 3 deletions
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23
res/res_musiconhold.c
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@@ -402,11 +402,28 @@ static int ast_moh_files_next(struct ast_channel *chan)
static struct ast_frame *moh_files_readframe(struct ast_channel *chan)
{
struct ast_frame *f = NULL;
struct ast_frame *f;
if (!(ast_channel_stream(chan) && (f = ast_readframe(ast_channel_stream(chan))))) {
if (!ast_moh_files_next(chan))
f = ast_readframe(ast_channel_stream(chan));
if (!f) {
/* Either there was no file stream setup or we reached EOF. */
if (!ast_moh_files_next(chan)) {
/*
* Either we resetup the previously saved file stream position
* or we started a new file stream.
*/
f = ast_readframe(ast_channel_stream(chan));
if (!f) {
/*
* We can get here if we were very unlucky because the
* resetup file stream was saved at EOF when MOH was
* previously stopped.
*/
if (!ast_moh_files_next(chan)) {
f = ast_readframe(ast_channel_stream(chan));
}
}
}
}
return f;