67 lines
1.8 KiB
C++
67 lines
1.8 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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#include "media/mp4/decoding_time_iterator.h"
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#include <algorithm>
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#include "base/logging.h"
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namespace media {
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namespace mp4 {
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DecodingTimeIterator::DecodingTimeIterator(
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const DecodingTimeToSample& decoding_time_to_sample)
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: sample_index_(0),
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decoding_time_table_(decoding_time_to_sample.decoding_time),
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iterator_(decoding_time_table_.begin()) {
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}
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bool DecodingTimeIterator::AdvanceSample() {
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++sample_index_;
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if (sample_index_ >= iterator_->sample_count) {
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++iterator_;
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if (iterator_ == decoding_time_table_.end())
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return false;
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sample_index_ = 0;
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}
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return true;
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}
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bool DecodingTimeIterator::IsValid() {
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return iterator_ != decoding_time_table_.end()
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&& sample_index_ < iterator_->sample_count;
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}
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uint64 DecodingTimeIterator::Duration(uint32 start_sample, uint32 end_sample) {
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DCHECK(start_sample <= end_sample);
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uint32 current_sample = 0;
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uint32 prev_sample = 0;
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uint64 duration = 0;
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std::vector<DecodingTime>::const_iterator it = decoding_time_table_.begin();
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for (; it != decoding_time_table_.end(); ++it) {
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current_sample += it->sample_count;
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if (current_sample >= start_sample) {
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duration += (std::min(end_sample, current_sample)
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- std::max(start_sample, prev_sample + 1) + 1) * it->sample_delta;
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if (current_sample >= end_sample)
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break;
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}
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prev_sample = current_sample;
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}
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return duration;
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}
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uint32 DecodingTimeIterator::NumSamples() {
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uint32 num_samples = 0;
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std::vector<DecodingTime>::const_iterator it = decoding_time_table_.begin();
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for (; it != decoding_time_table_.end(); ++it) {
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num_samples += it->sample_count;
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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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