From d3ce03667433bbb409c00ac58adcdf23818d1216 Mon Sep 17 00:00:00 2001
From: Anthony Jones <ajones@mozilla.com>
Date: Wed, 12 Nov 2014 16:37:43 +1300
Subject: [PATCH] Bug 1096157 - Add IsMediaSegmentPresent() for MP4;
 r=mattwoodrow

---
 dom/media/mediasource/ContainerParser.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/dom/media/mediasource/ContainerParser.cpp b/dom/media/mediasource/ContainerParser.cpp
index 436182404ae6..33a994621c92 100644
--- a/dom/media/mediasource/ContainerParser.cpp
+++ b/dom/media/mediasource/ContainerParser.cpp
@@ -218,6 +218,22 @@ public:
            aData[7] == 'p';
   }
 
+  bool IsMediaSegmentPresent(const uint8_t* aData, uint32_t aLength)
+  {
+    ContainerParser::IsMediaSegmentPresent(aData, aLength);
+    if (aLength < 8) {
+      return false;
+    }
+
+    uint32_t chunk_size = BigEndian::readUint32(aData);
+    if (chunk_size < 8) {
+      return false;
+    }
+
+    return aData[4] == 'm' && aData[5] == 'o' && aData[6] == 'o' &&
+           aData[7] == 'f';
+  }
+
   bool ParseStartAndEndTimestamps(const uint8_t* aData, uint32_t aLength,
                                   int64_t& aStart, int64_t& aEnd)
   {