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// Copyright (c) 2009 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.
//
// The video renderer implementation to be use by the media pipeline. It lives
// inside video renderer thread and also WebKit's main thread. We need to be
// extra careful about members shared by two different threads, especially
// video frame buffers.
//
// Methods called from WebKit's main thread:
// Paint()
// SetRect()
#ifndef WEBKIT_GLUE_MEDIA_VIDEO_RENDERER_IMPL_H_
#define WEBKIT_GLUE_MEDIA_VIDEO_RENDERER_IMPL_H_
#include "base/gfx/platform_canvas.h"
#include "base/gfx/rect.h"
#include "base/gfx/size.h"
#include "media/base/buffers.h"
#include "media/base/factory.h"
#include "media/base/filters.h"
#include "media/filters/video_renderer_base.h"
#include "webkit/api/public/WebMediaPlayer.h"
#include "webkit/glue/webmediaplayer_impl.h"
namespace webkit_glue {
class VideoRendererImpl : public media::VideoRendererBase {
public:
// Methods for painting called by the WebMediaPlayerImpl::Proxy
// This method is called with the same rect as the Paint method and could
// be used by future implementations to implement an improved color space +
// scale code on a separate thread. Since we always do the stretch on the
// same thread as the Paint method, we just ignore the call for now.
virtual void SetRect(const gfx::Rect& rect);
// Paint the current front frame on the |canvas| stretching it to fit the
// |dest_rect|
virtual void Paint(skia::PlatformCanvas* canvas, const gfx::Rect& dest_rect);
// Static method for creating factory for this object.
static media::FilterFactory* CreateFactory(WebMediaPlayerImpl::Proxy* proxy) {
return new media::FilterFactoryImpl1<VideoRendererImpl,
WebMediaPlayerImpl::Proxy*>(proxy);
}
// FilterFactoryImpl1 implementation.
static bool IsMediaFormatSupported(const media::MediaFormat& media_format);
protected:
// Method called by VideoRendererBase during initialization.
virtual bool OnInitialize(media::VideoDecoder* decoder);
// Method called by the VideoRendererBase when stopping.
virtual void OnStop();
// Method called by the VideoRendererBase when a frame is available.
virtual void OnFrameAvailable();
private:
// Only the filter factories can create instances.
friend class media::FilterFactoryImpl1<VideoRendererImpl,
WebMediaPlayerImpl::Proxy*>;
explicit VideoRendererImpl(WebMediaPlayerImpl::Proxy* proxy);
virtual ~VideoRendererImpl() {}
// Determine the conditions to perform fast paint. Returns true if we can do
// fast paint otherwise false.
bool CanFastPaint(skia::PlatformCanvas* canvas, const gfx::Rect& dest_rect);
// Slow paint does a YUV => RGB, and scaled blit in two separate operations.
void SlowPaint(media::VideoFrame* video_frame,
skia::PlatformCanvas* canvas,
const gfx::Rect& dest_rect);
// Fast paint does YUV => RGB, scaling, blitting all in one step into the
// canvas. It's not always safe and appropriate to perform fast paint.
// CanFastPaint() is used to determine the conditions.
void FastPaint(media::VideoFrame* video_frame,
skia::PlatformCanvas* canvas,
const gfx::Rect& dest_rect);
void TransformToSkIRect(const SkMatrix& matrix, const gfx::Rect& src_rect,
SkIRect* dest_rect);
// Pointer to our parent object that is called to request repaints.
scoped_refptr<WebMediaPlayerImpl::Proxy> proxy_;
// An RGB bitmap used to convert the video frames.
SkBitmap bitmap_;
// These two members are used to determine if the |bitmap_| contains
// an already converted image of the current frame. IMPORTANT NOTE: The
// value of |last_converted_frame_| must only be used for comparison purposes,
// and it should be assumed that the value of the pointer is INVALID unless
// it matches the pointer returned from GetCurrentFrame(). Even then, just
// to make sure, we compare the timestamp to be sure the bits in the
// |current_frame_bitmap_| are valid.
media::VideoFrame* last_converted_frame_;
base::TimeDelta last_converted_timestamp_;
// The size of the video.
gfx::Size video_size_;
DISALLOW_COPY_AND_ASSIGN(VideoRendererImpl);
};
} // namespace webkit_glue
#endif // WEBKIT_GLUE_MEDIA_VIDEO_RENDERER_IMPL_H_
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