1 files changed, 79 insertions, 0 deletions
diff --git a/media/gmp-clearkey/0.1/AnnexB.cpp b/media/gmp-clearkey/0.1/AnnexB.cpp
new file mode 100644
index 000000000..952936deb
--- /dev/null
+++ b/media/gmp-clearkey/0.1/AnnexB.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2015, Mozilla Foundation and contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "AnnexB.h"
+#include "BigEndian.h"
+
+#include <cstring>
+
+using mozilla::BigEndian;
+
+static const uint8_t kAnnexBDelimiter[] = { 0, 0, 0, 1 };
+
+/* static */ void
+AnnexB::ConvertFrameInPlace(std::vector<uint8_t>& aBuffer)
+{
+  for (size_t i = 0; i < aBuffer.size() - 4 - sizeof(kAnnexBDelimiter) + 1; ) {
+    uint32_t nalLen = BigEndian::readUint32(&aBuffer[i]);
+    memcpy(&aBuffer[i], kAnnexBDelimiter, sizeof(kAnnexBDelimiter));
+    i += nalLen + 4;
+  }
+}
+
+static void
+ConvertParamSetToAnnexB(std::vector<uint8_t>::const_iterator& aIter,
+                        size_t aCount,
+                        std::vector<uint8_t>& aOutAnnexB)
+{
+  for (size_t i = 0; i < aCount; i++) {
+    aOutAnnexB.insert(aOutAnnexB.end(), kAnnexBDelimiter,
+                      kAnnexBDelimiter + sizeof(kAnnexBDelimiter));
+
+    uint16_t len = BigEndian::readUint16(&*aIter); aIter += 2;
+    aOutAnnexB.insert(aOutAnnexB.end(), aIter, aIter + len); aIter += len;
+  }
+}
+
+/* static */ void
+AnnexB::ConvertConfig(const std::vector<uint8_t>& aBuffer,
+                      std::vector<uint8_t>& aOutAnnexB)
+{
+  // Skip past irrelevant headers
+  auto it = aBuffer.begin() + 5;
+
+  if (it >= aBuffer.end()) {
+    return;
+  }
+
+  size_t count = *(it++) & 31;
+
+  // Check that we have enough bytes for the Annex B conversion
+  // and the next size field. Bail if not.
+  if (it + count * 2 >= aBuffer.end()) {
+    return;
+  }
+
+  ConvertParamSetToAnnexB(it, count, aOutAnnexB);
+
+  // Check that we have enough bytes for the Annex B conversion.
+  count = *(it++);
+  if (it + count * 2 > aBuffer.end()) {
+    aOutAnnexB.clear();
+    return;
+  }
+
+  ConvertParamSetToAnnexB(it, count, aOutAnnexB);
+}