media/base/video_frame_metadata.cc

   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 #include "base/logging.h"
   6 #include "base/strings/string_number_conversions.h"
   7 #include "media/base/video_frame_metadata.h"
   8
   9 namespace media {
  10
  11 namespace {
  12
  13 // Map enum key to internal std::string key used by base::DictionaryValue.
  14 inline std::string ToInternalKey(VideoFrameMetadata::Key key) {
  15   DCHECK_LT(key, VideoFrameMetadata::NUM_KEYS);
  16   return base::IntToString(static_cast<int>(key));
  17 }
  18
  19 }  // namespace
  20
  21 VideoFrameMetadata::VideoFrameMetadata() {}
  22
  23 VideoFrameMetadata::~VideoFrameMetadata() {}
  24
  25 bool VideoFrameMetadata::HasKey(Key key) const {
  26   return dictionary_.HasKey(ToInternalKey(key));
  27 }
  28
  29 void VideoFrameMetadata::SetBoolean(Key key, bool value) {
  30   dictionary_.SetBooleanWithoutPathExpansion(ToInternalKey(key), value);
  31 }
  32
  33 void VideoFrameMetadata::SetInteger(Key key, int value) {
  34   dictionary_.SetIntegerWithoutPathExpansion(ToInternalKey(key), value);
  35 }
  36
  37 void VideoFrameMetadata::SetDouble(Key key, double value) {
  38   dictionary_.SetDoubleWithoutPathExpansion(ToInternalKey(key), value);
  39 }
  40
  41 void VideoFrameMetadata::SetString(Key key, const std::string& value) {
  42   dictionary_.SetWithoutPathExpansion(
  43       ToInternalKey(key),
  44       // Using BinaryValue since we don't want the |value| interpreted as having
  45       // any particular character encoding (e.g., UTF-8) by
  46       // base::DictionaryValue.
  47       base::BinaryValue::CreateWithCopiedBuffer(value.data(), value.size()));
  48 }
  49
  50 void VideoFrameMetadata::SetTimeTicks(Key key, const base::TimeTicks& value) {
  51   const int64 internal_value = value.ToInternalValue();
  52   dictionary_.SetWithoutPathExpansion(
  53       ToInternalKey(key),
  54       base::BinaryValue::CreateWithCopiedBuffer(
  55           reinterpret_cast<const char*>(&internal_value),
  56           sizeof(internal_value)));
  57 }
  58
  59 void VideoFrameMetadata::SetValue(Key key, scoped_ptr<base::Value> value) {
  60   dictionary_.SetWithoutPathExpansion(ToInternalKey(key), value.Pass());
  61 }
  62
  63 bool VideoFrameMetadata::GetBoolean(Key key, bool* value) const {
  64   DCHECK(value);
  65   return dictionary_.GetBooleanWithoutPathExpansion(ToInternalKey(key), value);
  66 }
  67
  68 bool VideoFrameMetadata::GetInteger(Key key, int* value) const {
  69   DCHECK(value);
  70   return dictionary_.GetIntegerWithoutPathExpansion(ToInternalKey(key), value);
  71 }
  72
  73 bool VideoFrameMetadata::GetDouble(Key key, double* value) const {
  74   DCHECK(value);
  75   return dictionary_.GetDoubleWithoutPathExpansion(ToInternalKey(key), value);
  76 }
  77
  78 bool VideoFrameMetadata::GetString(Key key, std::string* value) const {
  79   DCHECK(value);
  80   const base::BinaryValue* const binary_value = GetBinaryValue(key);
  81   if (binary_value)
  82     value->assign(binary_value->GetBuffer(), binary_value->GetSize());
  83   return !!binary_value;
  84 }
  85
  86 bool VideoFrameMetadata::GetTimeTicks(Key key, base::TimeTicks* value) const {
  87   DCHECK(value);
  88   const base::BinaryValue* const binary_value = GetBinaryValue(key);
  89   if (binary_value && binary_value->GetSize() == sizeof(int64)) {
  90     int64 internal_value;
  91     memcpy(&internal_value, binary_value->GetBuffer(), sizeof(internal_value));
  92     *value = base::TimeTicks::FromInternalValue(internal_value);
  93     return true;
  94   }
  95   return false;
  96 }
  97
  98 const base::Value* VideoFrameMetadata::GetValue(Key key) const {
  99   const base::Value* result = nullptr;
 100   if (!dictionary_.GetWithoutPathExpansion(ToInternalKey(key), &result))
 101     return nullptr;
 102   return result;
 103 }
 104
 105 void VideoFrameMetadata::MergeInternalValuesInto(
 106     base::DictionaryValue* out) const {
 107   out->MergeDictionary(&dictionary_);
 108 }
 109
 110 void VideoFrameMetadata::MergeInternalValuesFrom(
 111     const base::DictionaryValue& in) {
 112   dictionary_.MergeDictionary(&in);
 113 }
 114
 115 const base::BinaryValue* VideoFrameMetadata::GetBinaryValue(Key key) const {
 116   const base::Value* internal_value = nullptr;
 117   if (dictionary_.GetWithoutPathExpansion(ToInternalKey(key),
 118                                           &internal_value) &&
 119       internal_value->GetType() == base::Value::TYPE_BINARY) {
 120     return static_cast<const base::BinaryValue*>(internal_value);
 121   }
 122   return nullptr;
 123 }
 124
 125 }  // namespace media