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/* 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 DOM_MEDIA_MP4_SAMPLE_ITERATOR_H_
#define DOM_MEDIA_MP4_SAMPLE_ITERATOR_H_
#include "ByteStream.h"
#include "MP4Interval.h"
#include "MediaData.h"
#include "MediaResource.h"
#include "MoofParser.h"
#include "TimeUnits.h"
#include "mozilla/ResultVariant.h"
#include "nsISupportsImpl.h"
namespace mozilla {
struct CencSampleEncryptionInfoEntry;
class IndiceWrapper;
class MP4SampleIndex;
struct Sample;
class SampleIterator {
public:
explicit SampleIterator(MP4SampleIndex* aIndex);
~SampleIterator();
bool HasNext();
already_AddRefed<mozilla::MediaRawData> GetNextHeader();
Result<already_AddRefed<mozilla::MediaRawData>, MediaResult> GetNext();
// The default seek mode finds the closest sync sample at or before the target
// time. Setting the mode to `First` allows seeking to the earliest sync
// sample instead, which is only used in a specific case.
enum class SyncSampleMode { Closest, First };
void Seek(const media::TimeUnit& aTime,
SyncSampleMode aMode = SyncSampleMode::Closest);
media::TimeUnit GetNextKeyframeTime();
private:
Result<Sample*, nsresult> Get();
// Gets the sample description entry for the current moof, or nullptr if
// called without a valid current moof.
SampleDescriptionEntry* GetSampleDescriptionEntry();
const CencSampleEncryptionInfoEntry* GetSampleEncryptionEntry() const;
// 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<MP4SampleIndex> mIndex;
friend class MP4SampleIndex;
size_t mCurrentMoof;
size_t mCurrentSample;
};
class MP4SampleIndex {
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MP4SampleIndex)
struct Indice {
uint64_t start_offset;
uint64_t end_offset;
int64_t start_composition;
int64_t end_composition;
int64_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<media::TimeUnit> mTime;
};
MP4SampleIndex(const mozilla::IndiceWrapper& aIndices, ByteStream* aSource,
uint32_t aTrackId, bool aIsAudio, uint32_t aTimeScale);
void UpdateMoofIndex(const mozilla::MediaByteRangeSet& aByteRanges,
bool aCanEvict);
void UpdateMoofIndex(const mozilla::MediaByteRangeSet& aByteRanges);
mozilla::media::TimeIntervals ConvertByteRangesToTimeRanges(
const mozilla::MediaByteRangeSet& aByteRanges);
uint64_t GetEvictionOffset(const media::TimeUnit& aTime);
bool IsFragmented() { return !!mMoofParser; }
friend class SampleIterator;
private:
~MP4SampleIndex();
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
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