61 lines
1.9 KiB
C++
61 lines
1.9 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_FORMATS_MP4_COMPOSITION_OFFSET_ITERATOR_H_
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#define MEDIA_FORMATS_MP4_COMPOSITION_OFFSET_ITERATOR_H_
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#include <stdint.h>
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#include <vector>
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#include "base/macros.h"
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#include "media/formats/mp4/box_definitions.h"
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namespace edash_packager {
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namespace media {
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namespace mp4 {
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/// Composition time to sample box (CTTS) 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 composition offset for a particular sample.
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class CompositionOffsetIterator {
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public:
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/// Create CompositionOffsetIterator from composition time to sample box.
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explicit CompositionOffsetIterator(
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const CompositionTimeToSample& composition_time_to_sample);
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~CompositionOffsetIterator();
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/// Advance the iterator 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 offset for current sample.
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int32_t sample_offset() const { return iterator_->sample_offset; }
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/// @return Sample offset @a sample, 1-based.
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int32_t SampleOffset(uint32_t sample) const;
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/// @return Total number of samples.
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uint32_t NumSamples() const;
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private:
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uint32_t 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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} // namespace edash_packager
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#endif // MEDIA_FORMATS_MP4_COMPOSITION_OFFSET_ITERATOR_H_
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