87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
// Copyright 2017 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 PACKAGER_MEDIA_FORMATS_WEBVTT_WEBVTT_TEXT_HANDLER_H_
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#define PACKAGER_MEDIA_FORMATS_WEBVTT_WEBVTT_TEXT_HANDLER_H_
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#include <stdint.h>
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#include <vector>
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#include "packager/media/base/media_handler.h"
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#include "packager/media/base/muxer_options.h"
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#include "packager/media/event/muxer_listener.h"
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namespace shaka {
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namespace media {
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// WebVttOutputHandler is the base class for all WebVtt text output handlers.
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// It handles taking in the samples and writing the text out, but relies on
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// sub classes to handle the logic of when and where to write the information.
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class WebVttOutputHandler : public MediaHandler {
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public:
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WebVttOutputHandler() = default;
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virtual ~WebVttOutputHandler() = default;
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protected:
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virtual Status OnStreamInfo(const StreamInfo& info) = 0;
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virtual Status OnSegmentInfo(const SegmentInfo& info) = 0;
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virtual Status OnTextSample(const TextSample& sample) = 0;
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virtual Status OnStreamEnd() = 0;
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// Top level functions for output. These functions should be used by
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// subclasses to write to files.
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void WriteCue(const std::string& id,
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uint64_t start,
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uint64_t end,
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const std::string& settings,
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const std::string& payload);
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// Writes the current state of the current segment to disk. This will
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// reset the internal state and set it up for the next segment.
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Status WriteSegmentToFile(const std::string& filename);
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private:
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WebVttOutputHandler(const WebVttOutputHandler&) = delete;
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WebVttOutputHandler& operator=(const WebVttOutputHandler&) = delete;
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Status InitializeInternal() override;
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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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// A buffer of characters waiting to be written to a file.
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std::string buffer_;
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};
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// This WebVttt output handler should only be used when the source WebVTT
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// content needs to be segmented across multiple files.
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class WebVttSegmentedOutputHandler : public WebVttOutputHandler {
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public:
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WebVttSegmentedOutputHandler(const MuxerOptions& muxer_options,
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std::unique_ptr<MuxerListener> muxer_listener);
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private:
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Status OnStreamInfo(const StreamInfo& info) override;
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Status OnSegmentInfo(const SegmentInfo& info) override;
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Status OnTextSample(const TextSample& sample) override;
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Status OnStreamEnd() override;
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Status OnSegmentEnded();
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void GoToNextSegment(uint64_t start_time_ms);
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const MuxerOptions muxer_options_;
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std::unique_ptr<MuxerListener> muxer_listener_;
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// Sum together all segment durations so we know how long the stream is.
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uint64_t total_duration_ms_ = 0;
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uint32_t segment_index_ = 0;
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};
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} // namespace media
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} // namespace shaka
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#endif // PACKAGER_MEDIA_FORMATS_WEBVTT_WEBVTT_TEXT_HANDLER_H_
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