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- // Copyright 2014 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_MP4_TRACK_RUN_ITERATOR_H_
- #define MEDIA_FORMATS_MP4_TRACK_RUN_ITERATOR_H_
- #include <stddef.h>
- #include <stdint.h>
- #include <memory>
- #include <vector>
- #include "base/memory/raw_ptr.h"
- #include "base/time/time.h"
- #include "media/base/media_export.h"
- #include "media/base/media_log.h"
- #include "media/base/stream_parser_buffer.h"
- #include "media/formats/mp4/box_definitions.h"
- #include "media/media_buildflags.h"
- namespace media {
- class DecryptConfig;
- namespace mp4 {
- base::TimeDelta MEDIA_EXPORT TimeDeltaFromRational(int64_t numer,
- int64_t denom);
- DecodeTimestamp MEDIA_EXPORT DecodeTimestampFromRational(int64_t numer,
- int64_t denom);
- struct SampleInfo;
- struct TrackRunInfo;
- class MEDIA_EXPORT TrackRunIterator {
- public:
- // Create a new TrackRunIterator. A reference to |moov| will be retained for
- // the lifetime of this object.
- TrackRunIterator(const Movie* moov, MediaLog* media_log);
- TrackRunIterator(const TrackRunIterator&) = delete;
- TrackRunIterator& operator=(const TrackRunIterator&) = delete;
- ~TrackRunIterator();
- // Sets up the iterator to handle all the runs from the current fragment.
- bool Init(const MovieFragment& moof);
- // Returns true if the properties of the current run or sample are valid.
- bool IsRunValid() const;
- bool IsSampleValid() const;
- // Advance the properties to refer to the next run or sample. These return
- // |false| on failure, but note that advancing to the end (IsRunValid() or
- // IsSampleValid() return false) is not a failure, and the properties are not
- // guaranteed to be consistent in that case.
- bool AdvanceRun();
- bool AdvanceSample();
- // Returns true if this track run has auxiliary information and has not yet
- // been cached. Only valid if IsRunValid().
- bool AuxInfoNeedsToBeCached();
- // Caches the CENC data from the given buffer. |buf| must be a buffer starting
- // at the offset given by cenc_offset(), with a |size| of at least
- // cenc_size(). Returns true on success, false on error.
- bool CacheAuxInfo(const uint8_t* buf, int size);
- // Returns the maximum buffer location at which no data earlier in the stream
- // will be required in order to read the current or any subsequent sample. You
- // may clear all data up to this offset before reading the current sample
- // safely. Result is in the same units as offset() (for Media Source this is
- // in bytes past the the head of the MOOF box).
- int64_t GetMaxClearOffset();
- // Property of the current run. Only valid if IsRunValid().
- uint32_t track_id() const;
- int64_t aux_info_offset() const;
- int aux_info_size() const;
- bool is_encrypted() const;
- bool is_audio() const;
- // Only one is valid, based on the value of is_audio().
- const AudioSampleEntry& audio_description() const;
- const VideoSampleEntry& video_description() const;
- // Properties of the current sample. Only valid if IsSampleValid().
- int64_t sample_offset() const;
- uint32_t sample_size() const;
- DecodeTimestamp dts() const;
- base::TimeDelta cts() const;
- base::TimeDelta duration() const;
- bool is_keyframe() const;
- // Only call when is_encrypted() is true and AuxInfoNeedsToBeCached() is
- // false. Result is owned by caller.
- std::unique_ptr<DecryptConfig> GetDecryptConfig();
- private:
- bool UpdateCts();
- bool ResetRun();
- const ProtectionSchemeInfo& protection_scheme_info() const;
- const TrackEncryption& track_encryption() const;
- uint32_t GetGroupDescriptionIndex(uint32_t sample_index) const;
- // Sample encryption information.
- bool IsSampleEncrypted(size_t sample_index) const;
- uint8_t GetIvSize(size_t sample_index) const;
- const std::vector<uint8_t>& GetKeyId(size_t sample_index) const;
- bool ApplyConstantIv(size_t sample_index, SampleEncryptionEntry* entry) const;
- raw_ptr<const Movie> moov_;
- raw_ptr<MediaLog> media_log_;
- std::vector<TrackRunInfo> runs_;
- std::vector<TrackRunInfo>::const_iterator run_itr_;
- std::vector<SampleInfo>::const_iterator sample_itr_;
- int64_t sample_dts_;
- int64_t sample_cts_;
- int64_t sample_offset_;
- };
- } // namespace mp4
- } // namespace media
- #endif // MEDIA_FORMATS_MP4_TRACK_RUN_ITERATOR_H_
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