From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 media/libstagefright/binding/SinfParser.cpp | 72 +++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 media/libstagefright/binding/SinfParser.cpp

(limited to 'media/libstagefright/binding/SinfParser.cpp')

diff --git a/media/libstagefright/binding/SinfParser.cpp b/media/libstagefright/binding/SinfParser.cpp
new file mode 100644
index 000000000..5cf3aa553
--- /dev/null
+++ b/media/libstagefright/binding/SinfParser.cpp
@@ -0,0 +1,72 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Unused.h"
+#include "mp4_demuxer/SinfParser.h"
+#include "mp4_demuxer/AtomType.h"
+#include "mp4_demuxer/Box.h"
+
+namespace mp4_demuxer {
+
+Sinf::Sinf(Box& aBox)
+  : mDefaultIVSize(0)
+  , mDefaultEncryptionType()
+{
+  SinfParser parser(aBox);
+  if (parser.GetSinf().IsValid()) {
+    *this = parser.GetSinf();
+  }
+}
+
+SinfParser::SinfParser(Box& aBox)
+{
+  for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
+    if (box.IsType("schm")) {
+      ParseSchm(box);
+    } else if (box.IsType("schi")) {
+      ParseSchi(box);
+    }
+  }
+}
+
+void
+SinfParser::ParseSchm(Box& aBox)
+{
+  BoxReader reader(aBox);
+
+  if (reader->Remaining() < 8) {
+    return;
+  }
+
+  mozilla::Unused << reader->ReadU32(); // flags -- ignore
+  mSinf.mDefaultEncryptionType = reader->ReadU32();
+}
+
+void
+SinfParser::ParseSchi(Box& aBox)
+{
+  for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
+    if (box.IsType("tenc")) {
+      ParseTenc(box);
+    }
+  }
+}
+
+void
+SinfParser::ParseTenc(Box& aBox)
+{
+  BoxReader reader(aBox);
+
+  if (reader->Remaining() < 24) {
+    return;
+  }
+
+  mozilla::Unused << reader->ReadU32(); // flags -- ignore
+
+  uint32_t isEncrypted = reader->ReadU24();
+  mSinf.mDefaultIVSize = reader->ReadU8();
+  memcpy(mSinf.mDefaultKeyID, reader->Read(16), 16);
+}
+
+}
-- 
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