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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_LIVE_WEBM_MUXER_DELEGATE_H_
#define MEDIA_MUXERS_LIVE_WEBM_MUXER_DELEGATE_H_
#include "base/callback.h"
#include "base/strings/string_piece.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 live-mode non-seekable
// implementation of the |mkvmuxer::IMkvWriter| interface. The output of the
// muxer writer will be provided to the client by repeated invoking the given
// |write_data_callback|.
class MEDIA_EXPORT LiveWebmMuxerDelegate : public WebmMuxer::Delegate {
public:
// Defines the type of a callback to be called when WebmMuxer is ready to
// write a chunk of data.
using WriteDataCB = base::RepeatingCallback<void(base::StringPiece)>;
explicit LiveWebmMuxerDelegate(WriteDataCB write_data_callback);
LiveWebmMuxerDelegate(const LiveWebmMuxerDelegate&) = delete;
LiveWebmMuxerDelegate& operator=(const LiveWebmMuxerDelegate&) = delete;
~LiveWebmMuxerDelegate() 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:
// Callback to dump written data as being called by libwebm.
const WriteDataCB write_data_callback_ GUARDED_BY_CONTEXT(sequence_checker_);
};
} // namespace media
#endif // MEDIA_MUXERS_LIVE_WEBM_MUXER_DELEGATE_H_