Load CMA backend from shared library

chromecast/media/cma/base/decrypt_config_impl.h

+// Copyright 2015 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_BASE_DECRYPT_CONFIG_IMPL_H_
+#define CHROMECAST_MEDIA_CMA_BASE_DECRYPT_CONFIG_IMPL_H_
+
+#include "chromecast/public/media/decrypt_config.h"
+
+namespace chromecast {
+namespace media {
+
+// Contains all information that a decryptor needs to decrypt a media sample.
+class DecryptConfigImpl : public DecryptConfig {
+ public:
+  DecryptConfigImpl(const std::string& key_id,

[gunsch, 2015/07/27 17:14:49]

WDYT about having the ctor instead be
DecryptConfigImpl(::media::DecryptConfig*), and just proxying all the getters?
Then our code can continue to use the ::media::DecryptConfig primitives as much
as possible.

[halliwell, 2015/07/28 02:19:35]

I've made a constructor that takes that, in response to Sergey's comment
elsewhere.  However, we have to copy the subsamples because they're a different
type.  We could proxy key_id and iv I guess, but I think it's a bit simpler just
copying, it means you don't have to reason about lifetime of the
::media::DecryptConfig at all.  Also, DecryptConfigMarshaller can construct this
object directly, it seems unnecessary to construct a temporary
::media::DecryptConfig just to wrap it in this.

+                    const std::string& iv,
+                    const std::vector<SubsampleEntry>& subsamples);
+  ~DecryptConfigImpl() override;
+
+  const std::string& key_id() const override;
+  const std::string& iv() const override;
+  const std::vector<SubsampleEntry>& subsamples() const override;
+
+ private:
+  std::string key_id_;
+  std::string iv_;
+  std::vector<SubsampleEntry> subsamples_;
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_BASE_DECRYPT_CONFIG_IMPL_H_