66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
// Copyright 2015 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 MEDIA_FORMATS_WEBM_SEEK_HEAD_H_
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#define MEDIA_FORMATS_WEBM_SEEK_HEAD_H_
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#include <stdint.h>
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#include <vector>
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#include "packager/third_party/libwebm/src/mkvmuxer.hpp"
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namespace shaka {
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namespace media {
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/// Used to write the SeekHead to the output stream. This supports non-seekable
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/// files and setting the values before write; this also supports updating.
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class SeekHead {
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public:
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SeekHead();
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~SeekHead();
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/// Writes the seek head to the given writer. This should only be called
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/// once. For seekable files, use WriteVoid first, then call this method.
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bool Write(mkvmuxer::IMkvWriter* writer);
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/// Writes a void element large enough to fit the SeekHead.
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bool WriteVoid(mkvmuxer::IMkvWriter* writer);
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void set_cluster_pos(uint64_t pos) { cluster_pos_ = pos; }
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void set_cues_pos(uint64_t pos) { cues_pos_ = pos; }
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void set_info_pos(uint64_t pos) { info_pos_ = pos; }
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void set_tracks_pos(uint64_t pos) { tracks_pos_ = pos; }
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private:
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SeekHead(const SeekHead&) = delete;
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SeekHead& operator=(const SeekHead&) = delete;
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struct SeekElement {
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mkvmuxer::uint64 id;
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mkvmuxer::uint64 position;
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mkvmuxer::uint64 size;
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SeekElement(uint64_t seek_id, uint64_t seek_position)
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: id(seek_id), position(seek_position), size(0) {}
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};
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// Create seek element vector from positions.
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std::vector<SeekElement> CreateSeekElements();
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// In practice, these positions, if set, will never be 0, so we use a zero
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// value to denote that they are not set.
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uint64_t cluster_pos_ = 0;
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uint64_t cues_pos_ = 0;
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uint64_t info_pos_ = 0;
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uint64_t tracks_pos_ = 0;
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bool wrote_void_ = false;
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const uint64_t total_void_size_ = 0;
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};
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} // namespace media
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} // namespace shaka
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#endif // MEDIA_FORMATS_WEBM_SEEK_HEAD_H_
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