[Webkit-unassigned] [Bug 132671] [GStreamer] A video element isn't drawn onto the canvas.

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Apr 1 07:03:27 PDT 2015


https://bugs.webkit.org/show_bug.cgi?id=132671

--- Comment #26 from Carlos Garcia Campos <cgarcia at igalia.com> ---
Comment on attachment 249918
  --> https://bugs.webkit.org/attachment.cgi?id=249918
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=249918&action=review

> Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp:83
> +#if USE(CAIRO)
> +#include <cairo-gl.h>
> +#endif

We can compile with cairo, but without cairo gl. We should expose those to the build somehow, or use ENABLE(ACCELERATED_2D_CANVAS) && USE(CAIRO)

> Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp:579
> +PassNativeImagePtr MediaPlayerPrivateGStreamerBase::nativeImageForCurrentTime()
> +{
> +#if !USE(GSTREAMER_GL)
> +    return nullptr;
> +#endif

This function is called inside a #if USE(GSTREAMER_GL) block, right? I think we could just defined it only in such case

> Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp:595
> +    if (!GST_IS_SAMPLE(m_sample.get()))
> +        return nullptr;
> +
> +    GstCaps* caps = gst_sample_get_caps(m_sample.get());
> +    if (!caps)
> +        return nullptr;
> +
> +    GstVideoInfo videoInfo;
> +    gst_video_info_init(&videoInfo);
> +    if (!gst_video_info_from_caps(&videoInfo, caps))
> +        return nullptr;

It seems to me this code is duplicated in several places already, maybe we could move it to a helper function, something like bool getSampleVideoInfo(GstSmaple* sample, GstVideoInfo& videoInfo);

> Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp:602
> +#if USE(CAIRO)

Do we need previous stuff (gst_video_frame_map) when not using cairo?

> Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp:604
> +    GLContext::sharingContext()->makeContextCurrent();
> +    GLContext* context = GLContext::sharingContext();

Why getting the sharing context twice? Can we get the context first and then calling context->makeContextCurrent() ?

> Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp:611
> +    FloatSize size = FloatSize(GST_VIDEO_INFO_WIDTH(&videoInfo), GST_VIDEO_INFO_HEIGHT(&videoInfo));

Why FloatSize? cairo expects integers

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