Index: chromecast/public/media/cast_decrypt_config.h |
diff --git a/chromecast/public/media/cast_decrypt_config.h b/chromecast/public/media/cast_decrypt_config.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..582bce9b0297af6df7bcbf6a06f4bca97b9da252 |
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+++ b/chromecast/public/media/cast_decrypt_config.h |
@@ -0,0 +1,50 @@ |
+// 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_PUBLIC_MEDIA_CAST_DECRYPT_CONFIG_H_ |
+#define CHROMECAST_PUBLIC_MEDIA_CAST_DECRYPT_CONFIG_H_ |
+ |
+#include <stdint.h> |
+#include <string> |
+#include <vector> |
+ |
+namespace chromecast { |
+namespace media { |
+ |
+// The Common Encryption spec provides for subsample encryption, where portions |
+// of a sample are set in cleartext. A SubsampleEntry specifies the number of |
+// clear and encrypted bytes in each subsample. For decryption, all of the |
+// encrypted bytes in a sample should be considered a single logical stream, |
+// regardless of how they are divided into subsamples, and the clear bytes |
+// should not be considered as part of decryption. This is logically equivalent |
+// to concatenating all 'cypher_bytes' portions of subsamples, decrypting that |
+// result, and then copying each byte from the decrypted block over the |
+// position of the corresponding encrypted byte. |
+struct SubsampleEntry { |
+ SubsampleEntry() : clear_bytes(0), cypher_bytes(0) {} |
+ SubsampleEntry(uint32_t clear_bytes, uint32_t cypher_bytes) |
+ : clear_bytes(clear_bytes), cypher_bytes(cypher_bytes) {} |
+ uint32_t clear_bytes; |
+ uint32_t cypher_bytes; |
+}; |
+ |
+// Contains all metadata needed to decrypt a media sample. |
+class CastDecryptConfig { |
+ public: |
+ virtual ~CastDecryptConfig() {} |
+ |
+ // Returns the ID for this sample's decryption key. |
+ virtual const std::string& key_id() const = 0; |
+ |
+ // Returns the initialization vector as defined by the encryption format. |
+ virtual const std::string& iv() const = 0; |
+ |
+ // Returns the clear and encrypted portions of the sample as described above. |
+ virtual const std::vector<SubsampleEntry>& subsamples() const = 0; |
+}; |
+ |
+} // namespace media |
+} // namespace chromecast |
+ |
+#endif // CHROMECAST_PUBLIC_MEDIA_CAST_DECRYPT_CONFIG_H_ |