65 lines
2.3 KiB
C++
65 lines
2.3 KiB
C++
// Copyright 2017 Google LLC. 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 PACKAGER_MEDIA_CHUNKING_TEXT_CHUNKER_H_
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#define PACKAGER_MEDIA_CHUNKING_TEXT_CHUNKER_H_
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#include <list>
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#include "packager/media/base/media_handler.h"
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namespace shaka {
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namespace media {
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// Media handler for taking a single stream of text samples and inserting
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// segment info based on a fixed segment duration and on cue events. The
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// only time a segment's duration will not match the fixed segment duration
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// is when a cue event is seen.
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class TextChunker : public MediaHandler {
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public:
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explicit TextChunker(double segment_duration_in_seconds);
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private:
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TextChunker(const TextChunker&) = delete;
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TextChunker& operator=(const TextChunker&) = delete;
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Status InitializeInternal() override { return Status::OK; }
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Status Process(std::unique_ptr<StreamData> stream_data) override;
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Status OnFlushRequest(size_t input_stream_index) override;
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Status OnStreamInfo(std::shared_ptr<const StreamInfo> info);
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Status OnCueEvent(std::shared_ptr<const CueEvent> cue);
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Status OnTextSample(std::shared_ptr<const TextSample> sample);
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// This does two things that should always happen together:
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// 1. Dispatch all the samples and a segment info for the time range
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// segment_start_ to segment_start_ + duration
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// 2. Set the next segment to start at segment_start_ + duration and
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// remove all samples that don't last into that segment.
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Status DispatchSegment(int64_t duration);
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int64_t ScaleTime(double seconds) const;
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double segment_duration_in_seconds_;
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int64_t time_scale_ = -1; // Set in OnStreamInfo
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// Time values are in scaled units.
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int64_t segment_start_ = -1; // Set when the first sample comes in.
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int64_t segment_duration_ = -1; // Set in OnStreamInfo.
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// All samples that make up the current segment. We must store the samples
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// until the segment ends because a cue event may end the segment sooner
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// than we expected.
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std::list<std::shared_ptr<const TextSample>> samples_in_current_segment_;
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};
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} // namespace media
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} // namespace shaka
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#endif // PACKAGER_MEDIA_CHUNKING_TEXT_CHUNKER_H_
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