1 files changed, 135 insertions, 0 deletions
diff --git a/dom/media/mp4/Index.h b/dom/media/mp4/Index.h
new file mode 100644
index 0000000000..afd0c051af
--- /dev/null
+++ b/dom/media/mp4/Index.h
@@ -0,0 +1,135 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef INDEX_H_
+#define INDEX_H_
+
+#include "ByteStream.h"
+#include "MediaData.h"
+#include "MediaResource.h"
+#include "MoofParser.h"
+#include "mozilla/ResultVariant.h"
+#include "MP4Interval.h"
+#include "nsISupportsImpl.h"
+#include "TimeUnits.h"
+
+namespace mozilla {
+class IndiceWrapper;
+struct Sample;
+struct CencSampleEncryptionInfoEntry;
+
+class Index;
+
+typedef int64_t Microseconds;
+
+class SampleIterator {
+ public:
+  explicit SampleIterator(Index* aIndex);
+  ~SampleIterator();
+  already_AddRefed<mozilla::MediaRawData> GetNext();
+  void Seek(Microseconds aTime);
+  Microseconds GetNextKeyframeTime();
+
+ private:
+  Sample* Get();
+
+  // Gets the sample description entry for the current moof, or nullptr if
+  // called without a valid current moof.
+  SampleDescriptionEntry* GetSampleDescriptionEntry();
+  CencSampleEncryptionInfoEntry* GetSampleEncryptionEntry();
+
+  // Determines the encryption scheme in use for the current sample. If the
+  // the scheme cannot be unambiguously determined, will return an error with
+  // the reason.
+  //
+  // Returns: Ok(CryptoScheme) if a crypto scheme, including None, can be
+  // determined, or Err(nsCString) if there is an issue determining the scheme.
+  Result<CryptoScheme, nsCString> GetEncryptionScheme();
+
+  void Next();
+  RefPtr<Index> mIndex;
+  friend class Index;
+  size_t mCurrentMoof;
+  size_t mCurrentSample;
+};
+
+class Index {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(Index)
+
+  struct Indice {
+    uint64_t start_offset;
+    uint64_t end_offset;
+    uint64_t start_composition;
+    uint64_t end_composition;
+    uint64_t start_decode;
+    bool sync;
+  };
+
+  struct MP4DataOffset {
+    MP4DataOffset(uint32_t aIndex, int64_t aStartOffset)
+        : mIndex(aIndex), mStartOffset(aStartOffset), mEndOffset(0) {}
+
+    bool operator==(int64_t aStartOffset) const {
+      return mStartOffset == aStartOffset;
+    }
+
+    bool operator!=(int64_t aStartOffset) const {
+      return mStartOffset != aStartOffset;
+    }
+
+    bool operator<(int64_t aStartOffset) const {
+      return mStartOffset < aStartOffset;
+    }
+
+    struct EndOffsetComparator {
+      bool Equals(const MP4DataOffset& a, const int64_t& b) const {
+        return a.mEndOffset == b;
+      }
+
+      bool LessThan(const MP4DataOffset& a, const int64_t& b) const {
+        return a.mEndOffset < b;
+      }
+    };
+
+    uint32_t mIndex;
+    int64_t mStartOffset;
+    int64_t mEndOffset;
+    MP4Interval<Microseconds> mTime;
+  };
+
+  Index(const mozilla::IndiceWrapper& aIndices, ByteStream* aSource,
+        uint32_t aTrackId, bool aIsAudio);
+
+  void UpdateMoofIndex(const mozilla::MediaByteRangeSet& aByteRanges,
+                       bool aCanEvict);
+  void UpdateMoofIndex(const mozilla::MediaByteRangeSet& aByteRanges);
+  Microseconds GetEndCompositionIfBuffered(
+      const mozilla::MediaByteRangeSet& aByteRanges);
+  mozilla::media::TimeIntervals ConvertByteRangesToTimeRanges(
+      const mozilla::MediaByteRangeSet& aByteRanges);
+  uint64_t GetEvictionOffset(Microseconds aTime);
+  bool IsFragmented() { return !!mMoofParser; }
+
+  friend class SampleIterator;
+
+ private:
+  ~Index();
+  void RegisterIterator(SampleIterator* aIterator);
+  void UnregisterIterator(SampleIterator* aIterator);
+
+  ByteStream* mSource;
+  FallibleTArray<Sample> mIndex;
+  FallibleTArray<MP4DataOffset> mDataOffset;
+  UniquePtr<MoofParser> mMoofParser;
+  nsTArray<SampleIterator*> mIterators;
+
+  // ConvertByteRangesToTimeRanges cache
+  mozilla::MediaByteRangeSet mLastCachedRanges;
+  mozilla::media::TimeIntervals mLastBufferedRanges;
+  bool mIsAudio;
+};
+}  // namespace mozilla
+
+#endif