56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef MEDIA_MP4_DECODING_TIME_ITERATOR_H_
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#define MEDIA_MP4_DECODING_TIME_ITERATOR_H_
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#include <vector>
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#include "media/mp4/box_definitions.h"
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namespace media {
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namespace mp4 {
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/// Decoding time to sample box (STTS) iterator used to iterate through the
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/// compressed table. This class also provides convenient functions to query
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/// total number of samples and the duration from start_sample to end_sample.
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class DecodingTimeIterator {
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public:
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/// Create DecodingTimeIterator from decoding time to sample box.
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explicit DecodingTimeIterator(
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const DecodingTimeToSample& decoding_time_to_sample);
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~DecodingTimeIterator();
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/// Advance to the next sample.
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/// @return true if not past the last sample, false otherwise.
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bool AdvanceSample();
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/// @return true if the iterator is still valid, false if past the last
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/// sample.
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bool IsValid() const;
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/// @return Sample delta for current sample.
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uint32 sample_delta() const { return iterator_->sample_delta; }
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/// @return Duration from start_sample to end_sample, both 1-based, inclusive.
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uint64 Duration(uint32 start_sample, uint32 end_sample) const;
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/// @return Total number of samples in the table.
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uint32 NumSamples() const;
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private:
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uint32 sample_index_;
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const std::vector<DecodingTime>& decoding_time_table_;
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std::vector<DecodingTime>::const_iterator iterator_;
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DISALLOW_COPY_AND_ASSIGN(DecodingTimeIterator);
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_MP4_DECODING_TIME_ITERATOR_H_
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