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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MEDIA_BASE_VIDEO_FRAME_METADATA_H_ |
| 6 #define MEDIA_BASE_VIDEO_FRAME_METADATA_H_ |
| 7 |
| 8 #include "base/compiler_specific.h" |
| 9 #include "base/time/time.h" |
| 10 #include "base/values.h" |
| 11 #include "media/base/media_export.h" |
| 12 |
| 13 namespace media { |
| 14 |
| 15 class MEDIA_EXPORT VideoFrameMetadata { |
| 16 public: |
| 17 enum Key { |
| 18 // Video capture begin/end timestamps. Consumers can use these values for |
| 19 // dynamic optimizations, logging stats, etc. Use Get/SetTimeTicks() for |
| 20 // these keys. |
| 21 CAPTURE_BEGIN_TIME, |
| 22 CAPTURE_END_TIME, |
| 23 |
| 24 // Represents either the fixed frame rate, or the maximum frame rate to |
| 25 // expect from a variable-rate source. Use Get/SetDouble() for this key. |
| 26 FRAME_RATE, |
| 27 |
| 28 NUM_KEYS |
| 29 }; |
| 30 |
| 31 VideoFrameMetadata(); |
| 32 ~VideoFrameMetadata(); |
| 33 |
| 34 bool HasKey(Key key) const; |
| 35 |
| 36 void Clear() { dictionary_.Clear(); } |
| 37 |
| 38 // Setters. Overwrites existing value, if present. |
| 39 void SetBoolean(Key key, bool value); |
| 40 void SetInteger(Key key, int value); |
| 41 void SetDouble(Key key, double value); |
| 42 void SetString(Key key, const std::string& value); |
| 43 void SetTimeTicks(Key key, const base::TimeTicks& value); |
| 44 void SetValue(Key key, scoped_ptr<base::Value> value); |
| 45 |
| 46 // Getters. Returns true if |key| was present and has the value has been set. |
| 47 bool GetBoolean(Key key, bool* value) const WARN_UNUSED_RESULT; |
| 48 bool GetInteger(Key key, int* value) const WARN_UNUSED_RESULT; |
| 49 bool GetDouble(Key key, double* value) const WARN_UNUSED_RESULT; |
| 50 bool GetString(Key key, std::string* value) const WARN_UNUSED_RESULT; |
| 51 bool GetTimeTicks(Key key, base::TimeTicks* value) const WARN_UNUSED_RESULT; |
| 52 |
| 53 // Returns null if |key| was not present. |
| 54 const base::Value* GetValue(Key key) const WARN_UNUSED_RESULT; |
| 55 |
| 56 // For serialization. |
| 57 void MergeInternalValuesInto(base::DictionaryValue* out) const; |
| 58 void MergeInternalValuesFrom(const base::DictionaryValue& in); |
| 59 |
| 60 private: |
| 61 const base::BinaryValue* GetBinaryValue(Key key) const; |
| 62 |
| 63 base::DictionaryValue dictionary_; |
| 64 |
| 65 DISALLOW_COPY_AND_ASSIGN(VideoFrameMetadata); |
| 66 }; |
| 67 |
| 68 } // namespace media |
| 69 |
| 70 #endif // MEDIA_BASE_VIDEO_FRAME_METADATA_H_ |
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