76 lines
2.1 KiB
C++
76 lines
2.1 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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#include "media/formats/mp4/chunk_info_iterator.h"
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#include <algorithm>
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#include <limits>
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#include "base/logging.h"
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namespace edash_packager {
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namespace media {
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namespace mp4 {
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ChunkInfoIterator::ChunkInfoIterator(const SampleToChunk& sample_to_chunk)
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: chunk_sample_index_(0),
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current_chunk_(0),
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chunk_info_table_(sample_to_chunk.chunk_info),
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iterator_(chunk_info_table_.begin()) {
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if (iterator_ != chunk_info_table_.end())
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current_chunk_ = iterator_->first_chunk;
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}
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ChunkInfoIterator::~ChunkInfoIterator() {}
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bool ChunkInfoIterator::AdvanceChunk() {
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++current_chunk_;
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if (iterator_ + 1 != chunk_info_table_.end()) {
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if (current_chunk_ >= (iterator_ + 1)->first_chunk)
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++iterator_;
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}
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chunk_sample_index_ = 0;
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return true;
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}
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bool ChunkInfoIterator::AdvanceSample() {
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++chunk_sample_index_;
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if (chunk_sample_index_ >= iterator_->samples_per_chunk)
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AdvanceChunk();
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return true;
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}
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bool ChunkInfoIterator::IsValid() const {
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return iterator_ != chunk_info_table_.end() &&
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chunk_sample_index_ < iterator_->samples_per_chunk;
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}
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uint32 ChunkInfoIterator::NumSamples(uint32 start_chunk,
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uint32 end_chunk) const {
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DCHECK_LE(start_chunk, end_chunk);
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uint32 last_chunk = 0;
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uint32 num_samples = 0;
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for (std::vector<ChunkInfo>::const_iterator it = chunk_info_table_.begin();
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it != chunk_info_table_.end();
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++it) {
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last_chunk = (it + 1 == chunk_info_table_.end())
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? std::numeric_limits<uint32>::max()
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: (it + 1)->first_chunk - 1;
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if (last_chunk >= start_chunk) {
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num_samples += (std::min(end_chunk, last_chunk) -
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std::max(start_chunk, it->first_chunk) + 1) *
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it->samples_per_chunk;
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if (last_chunk >= end_chunk)
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break;
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}
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}
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return num_samples;
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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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