From d6f28d456c6ec5ecf39c868447d85294a698166d Mon Sep 17 00:00:00 2001
From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
Date: Wed, 12 Jul 2023 23:51:00 +0200
Subject: [PATCH] fix: Prevent crash in GetEarliestTimestamp() if periods are
 empty (#1173)

While I have not yet found why the periods are empty, this will prevent shaka from seg faulting

Fixes #1172
---
 packager/mpd/base/mpd_builder.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packager/mpd/base/mpd_builder.cc b/packager/mpd/base/mpd_builder.cc
index f09381601e..e2241dc2e3 100644
--- a/packager/mpd/base/mpd_builder.cc
+++ b/packager/mpd/base/mpd_builder.cc
@@ -342,6 +342,8 @@ float MpdBuilder::GetStaticMpdDuration() {
 bool MpdBuilder::GetEarliestTimestamp(double* timestamp_seconds) {
   DCHECK(timestamp_seconds);
   DCHECK(!periods_.empty());
+  if (periods_.empty())
+    return false;
   double timestamp = 0;
   double earliest_timestamp = -1;
   // TODO(kqyang): This is used to set availabilityStartTime. We may consider