Chromecast: adds a media pipeline feeding data to CMA device backends.

chromecast/media/cma/pipeline/decrypt_util.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROMECAST_MEDIA_CMA_PIPELINE_DECRYPT_UTIL_H_
+#define CHROMECAST_MEDIA_CMA_PIPELINE_DECRYPT_UTIL_H_
+
+#include "base/memory/ref_counted.h"
+
+namespace crypto {
+class SymmetricKey;
+}
+
+namespace chromecast {
+namespace media {
+
+class DecoderBufferBase;
+
+// Create a new buffer which corresponds to the clear version of |buffer|.
+// Note: the memory area corresponding to the ES data of the new buffer
+// is the same as the ES data of |buffer| (for efficiency).
+// After the function is called, |buffer| is left in a inconsistent state
+// in the sense it has some decryption info but the ES data is now in clear.
+scoped_refptr<DecoderBufferBase> DecryptDecoderBuffer(
+    const scoped_refptr<DecoderBufferBase>& buffer,
+    crypto::SymmetricKey* key);
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_PIPELINE_DECRYPT_UTIL_H_