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Diffstat (limited to 'media/base/video_renderer_sink.h')
-rw-r--r-- | media/base/video_renderer_sink.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/media/base/video_renderer_sink.h b/media/base/video_renderer_sink.h new file mode 100644 index 0000000..a2852ff --- /dev/null +++ b/media/base/video_renderer_sink.h @@ -0,0 +1,64 @@ +// Copyright 2015 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. + +#ifndef MEDIA_BASE_VIDEO_RENDERER_SINK_H_ +#define MEDIA_BASE_VIDEO_RENDERER_SINK_H_ + +#include "base/basictypes.h" +#include "base/logging.h" +#include "base/memory/ref_counted.h" +#include "base/time/time.h" +#include "media/base/media_export.h" +#include "media/base/video_frame.h" + +namespace media { + +// VideoRendererSink is an interface representing the end-point for rendered +// video frames. An implementation is expected to periodically call Render() on +// a callback object. +class MEDIA_EXPORT VideoRendererSink { + public: + class RenderCallback { + public: + // Returns a VideoFrame for rendering which should be displayed within the + // presentation interval [|deadline_min|, |deadline_max|]. Returns NULL if + // no frame or no new frame (since the last Render() call) is available for + // rendering within the requested interval. Intervals are expected to be + // regular, contiguous, and monotonically increasing. Irregular intervals + // may affect the rendering decisions made by the underlying callback. + virtual scoped_refptr<VideoFrame> Render(base::TimeTicks deadline_min, + base::TimeTicks deadline_max) = 0; + + // Called by the sink when a VideoFrame previously returned via Render() was + // not actually rendered. Must be called before the next Render() call. + virtual void OnFrameDropped() = 0; + + virtual ~RenderCallback() {} + }; + + // Starts video rendering. See RenderCallback for more details. Must be + // called to receive Render() callbacks. Callbacks may start immediately, so + // |callback| must be ready to receive callbacks before calling Start(). + virtual void Start(RenderCallback* callback) = 0; + + // Stops video rendering, waits for any outstanding calls to the |callback| + // given to Start() to complete before returning. No new calls to |callback| + // will be issued after this method returns. May be used as a means of power + // conservation by the sink implementation, so clients should call this + // liberally if no new frames are expected. + virtual void Stop() = 0; + + // Instead of using a callback driven rendering path, allow clients to paint + // frames as they see fit without regard for the compositor. + // TODO(dalecurtis): This should be nuked once experiments show the new path + // is amazing and the old path is not! http://crbug.com/439548 + virtual void PaintFrameUsingOldRenderingPath( + const scoped_refptr<VideoFrame>& frame) = 0; + + virtual ~VideoRendererSink() {} +}; + +} // namespace media + +#endif // MEDIA_BASE_VIDEO_RENDERER_SINK_H_ |