71 lines
2.2 KiB
C++
71 lines
2.2 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_CHUNK_INFO_ITERATOR_H_
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#define MEDIA_FORMATS_MP4_CHUNK_INFO_ITERATOR_H_
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#include <vector>
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#include "media/formats/mp4/box_definitions.h"
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namespace media {
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namespace mp4 {
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/// Sample to chunk box (STSC) iterator used to iterate through the compressed
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/// table by sample/chunk. This class also provides a convenient function to
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/// query total number of samples from start_chunk to end_chunk.
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class ChunkInfoIterator {
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public:
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/// Create ChunkInfoIterator from sample to chunk box.
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explicit ChunkInfoIterator(const SampleToChunk& sample_to_chunk);
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~ChunkInfoIterator();
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/// Advance to the next chunk.
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/// @return true if not past the last chunk, false otherwise.
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bool AdvanceChunk();
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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 not past the last chunk/sample, false otherwise.
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bool IsValid() const;
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/// @return Current chunk.
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uint32 current_chunk() const { return current_chunk_; }
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/// @return Samples per chunk for current chunk.
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uint32 samples_per_chunk() const { return iterator_->samples_per_chunk; }
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/// @return Sample description index for current chunk.
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uint32 sample_description_index() const {
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return iterator_->sample_description_index;
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}
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/// @return Number of samples from start_chunk to end_chunk, both 1-based,
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/// inclusive.
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uint32 NumSamples(uint32 start_chunk, uint32 end_chunk) const;
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/// @return The last first_chunk in chunk_info_table.
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uint32 LastFirstChunk() const {
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return chunk_info_table_.empty() ? 0
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: chunk_info_table_.back().first_chunk;
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}
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private:
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uint32 chunk_sample_index_;
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uint32 current_chunk_;
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const std::vector<ChunkInfo>& chunk_info_table_;
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std::vector<ChunkInfo>::const_iterator iterator_;
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DISALLOW_COPY_AND_ASSIGN(ChunkInfoIterator);
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_FORMATS_MP4_CHUNK_INFO_ITERATOR_H_
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