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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "base/time/time.h"
namespace gfx {
class Size;
namespace media {
class VideoFrame;
namespace cast {
// Interface for an object capable of vending video frames. There is no
// requirement for a |VideoFrameFactory| to be concurrent but it must not be
// pinned to a specific thread. Indeed, |VideoFrameFactory| implementations are
// created by cast on the main cast thread then used by unknown client threads
// via the |VideoFrameInput| interface.
// Clients are responsible for serialzing access to a |VideoFrameFactory|.
// Generally speaking, it is expected that a client will be using these objects
// from a rendering thread or callback (which may execute on different threads
// but never concurrently with itself).
class VideoFrameFactory {
virtual ~VideoFrameFactory() {}
// Creates a |VideoFrame| suitable for input via |InsertRawVideoFrame|. Frames
// obtained in this manner may provide benefits such memory reuse and affinity
// with the encoder. The format is guaranteed to be I420 or NV12.
// This can transiently return null if the encoder is not yet initialized or
// is re-initializing. Note however that if an encoder does support optimized
// frames, its |VideoFrameFactory| must eventually return frames. In practice,
// this means that |MaybeCreateFrame| must somehow signal the encoder to
// perform whatever initialization is needed to eventually produce frames.
virtual scoped_refptr<VideoFrame> MaybeCreateFrame(
const gfx::Size& frame_size, base::TimeDelta timestamp) = 0;
} // namespace cast
} // namespace media