73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
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// Copyright (c) 2013 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Implements a wrapper around Sample to Chunk Box (STSC) to iterate through
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// the compressed table by sample/chunk. This class also provides a convenient
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// function to query total number of samples from start_chunk to end_chunk.
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#ifndef MEDIA_MP4_CHUNK_INFO_ITERATOR_H_
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#define MEDIA_MP4_CHUNK_INFO_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 ChunkInfoIterator {
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public:
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explicit ChunkInfoIterator(const SampleToChunk& sample_to_chunk);
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// Advance the properties to refer to the next chunk. Return status
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// indicating whether the chunk is still valid.
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bool AdvanceChunk();
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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 chunk is valid.
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bool IsValid();
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// Return current chunk.
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uint32 current_chunk() {
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return current_chunk_;
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}
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// Return samples per chunk for current chunk.
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uint32 samples_per_chunk() {
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return iterator_->samples_per_chunk;
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}
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// Return sample description index for current chunk.
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uint32 sample_description_index() {
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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);
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// Return the last first_chunk in chunk_info_table.
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uint32 LastFirstChunk() {
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if (chunk_info_table_.size() == 0)
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return 0;
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return (chunk_info_table_.end() - 1)->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_MP4_CHUNK_INFO_ITERATOR_H_
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