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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_MUXERS_FILE_WEBM_MUXER_DELEGATE_H_
#define MEDIA_MUXERS_FILE_WEBM_MUXER_DELEGATE_H_
#include "base/files/file.h"
#include "base/thread_annotations.h"
#include "media/base/media_export.h"
#include "media/muxers/webm_muxer.h"
namespace media {
// Defines a delegate for WebmMuxer that provides a seekable file-based
// implementation of the |mkvmuxer::IMkvWriter| interface. This allows a
// SeekHead element to be written to the given |webm_file| once the muxer is
// flushed and finalized. This allows video players to be able to seek through
// the video and jump to any arbitrary position.
class MEDIA_EXPORT FileWebmMuxerDelegate : public WebmMuxer::Delegate {
public:
// |webm_file| must be an already valid opened file ready for writing.
explicit FileWebmMuxerDelegate(base::File webm_file);
FileWebmMuxerDelegate(const FileWebmMuxerDelegate&) = delete;
FileWebmMuxerDelegate& operator=(const FileWebmMuxerDelegate&) = delete;
~FileWebmMuxerDelegate() override;
// WebmMuxer::Delegate:
void InitSegment(mkvmuxer::Segment* segment) override;
// mkvmuxer::IMkvWriter:
mkvmuxer::int64 Position() const override;
mkvmuxer::int32 Position(mkvmuxer::int64 position) override;
bool Seekable() const override;
void ElementStartNotify(mkvmuxer::uint64 element_id,
mkvmuxer::int64 position) override;
protected:
// WebmMuxerDelegate:
mkvmuxer::int32 DoWrite(const void* buf, mkvmuxer::uint32 len) override;
private:
base::File webm_file_ GUARDED_BY_CONTEXT(sequence_checker_);
};
} // namespace media
#endif // MEDIA_MUXERS_FILE_WEBM_MUXER_DELEGATE_H_