55 lines
1.6 KiB
C++
55 lines
1.6 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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//
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// Implements a wrapper around Composition Time to Sample Box (CTTS) to iterate
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// through the compressed table. This class also provides convenient functions
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// to query total number of samples and the composition offset for a particular
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// sample.
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#ifndef MEDIA_MP4_COMPOSITION_OFFSET_ITERATOR_H_
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#define MEDIA_MP4_COMPOSITION_OFFSET_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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class CompositionOffsetIterator {
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public:
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explicit CompositionOffsetIterator(
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const CompositionTimeToSample& composition_time_to_sample);
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// Advance the properties to refer to the next sample. Return status
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// indicating whether the sample is still valid.
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bool AdvanceSample();
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// Return whether the current sample is valid.
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bool IsValid() const;
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// Return sample offset for current sample.
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uint32 sample_offset() const { return iterator_->sample_offset; }
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// Return sample offset @ sample, 1-based.
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uint32 SampleOffset(uint32 sample) const;
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// Return total number of samples.
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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<CompositionOffset>& composition_offset_table_;
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std::vector<CompositionOffset>::const_iterator iterator_;
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DISALLOW_COPY_AND_ASSIGN(CompositionOffsetIterator);
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_MP4_COMPOSITION_OFFSET_ITERATOR_H_
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