Index: media/formats/mp2t/descriptors.h |
diff --git a/media/formats/mp2t/descriptors.h b/media/formats/mp2t/descriptors.h |
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+// 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 MEDIA_FORMATS_MP2T_DESCRIPTORS_H_ |
+#define MEDIA_FORMATS_MP2T_DESCRIPTORS_H_ |
+ |
+#include <stdint.h> |
+ |
+#include <map> |
+#include <string> |
+ |
+namespace media { |
+ |
+class BitReader; |
+ |
+namespace mp2t { |
+ |
+// Representation of a list of descriptors, used in the MPEG-2 Systems standard |
+// to extend the definitions of programs or program elements. While the standard |
+// appears to permit multiple descriptors in such a list to have the same tag |
+// value, the implementation herein will not support this. |
+class Descriptors { |
+ public: |
+ Descriptors(); |
+ Descriptors(const Descriptors& other); |
+ ~Descriptors(); |
+ |
+ // Attempts to read a (possibly empty) list of descriptors from the |reader|. |
+ // If |size| > 0, the descriptors must occupy exactly |size| bytes, Otherwise, |
+ // the descriptors should use all available bits from the reader. |
+ bool Read(BitReader* reader, int size); |
+ |
+ // Indicates whether a Registration descriptor is present. If so, the |
+ // |format_identifier| and |additional_info| values are populated with the |
+ // contents of the descriptor. |
+ bool HasRegistrationDescriptor(int64_t* format_identifier, |
+ std::string* additional_info) const; |
+ |
+ // Indicates whether a CA descriptor is present. If so, the |system_id|, |
+ // |pid|, and |private_data| values are populated with the contents of the |
+ // descriptor. |
+ bool HasCADescriptor(int* system_id, |
+ int* pid, |
+ std::string* private_data) const; |
+ |
+ // Indicates whether a CA descriptor is present, and if so, whether it is |
+ // of the type defined by ISO/IEC 23001-9:2014 (i.e. with a specific |
+ // system_id value and layout of the private_data). If so, the |ca_pid| and |
+ // |pssh_pid| are populated with the contents of the descriptor. |
+ bool HasCADescriptorCenc(int* ca_pid, int* pssh_pid) const; |
+ |
+ // Indicates whether a Private Data Indicator descriptor is present with a |
+ // particular |value|. |
+ bool HasPrivateDataIndicator(int64_t value) const; |
+ |
+ private: |
+ using Descriptor = std::pair<int, std::string>; |
+ std::map<int, std::string> descriptors_; |
+ |
+ // Allow copy and assign so that it can be used in a std C++ container. |
+}; |
+ |
+} // namespace mp2t |
+} // namespace media |
+ |
+#endif // MEDIA_FORMATS_MP2T_DESCRIPTOR_LIST_H_ |