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/*
* Copyright (C) 2022 Igalia, S.L
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "DMABufVideoSinkGStreamer.h"
#if ENABLE(VIDEO)
#include "GStreamerCommon.h"
#include "GStreamerVideoSinkCommon.h"
#include <gst/allocators/gstdmabuf.h>
#include <mutex>
#include <wtf/glib/WTFGType.h>
#if USE(GBM)
#include "GBMDevice.h"
#endif
using namespace WebCore;
enum {
PROP_0,
PROP_STATS,
PROP_LAST
};
struct _WebKitDMABufVideoSinkPrivate {
GRefPtr<GstElement> appSink;
MediaPlayerPrivateGStreamer* mediaPlayerPrivate;
};
GST_DEBUG_CATEGORY_STATIC(webkit_dmabuf_video_sink_debug);
#define GST_CAT_DEFAULT webkit_dmabuf_video_sink_debug
#define GST_WEBKIT_DMABUF_SINK_CAPS_FORMAT_LIST "{ RGBA, RGBx, BGRA, BGRx, I420, YV12, A420, NV12, NV21, Y444, Y41B, Y42B, VUYA, P010_10LE, P010_10BE, P016_LE, P016BE }"
static GstStaticPadTemplate sinkTemplate = GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY);
// TODO: this is a list of remaining YUV formats we want to support, but don't currently work (due to improper handling in TextureMapper):
// YUY2, YVYU, UYVY, VYUY, AYUV
#define webkit_dmabuf_video_sink_parent_class parent_class
WEBKIT_DEFINE_TYPE_WITH_CODE(WebKitDMABufVideoSink, webkit_dmabuf_video_sink, GST_TYPE_BIN,
GST_DEBUG_CATEGORY_INIT(webkit_dmabuf_video_sink_debug, "webkitdmabufvideosink", 0, "DMABuf video sink element"))
// WEBKIT_GST_DMABUF_SINK_FORCED_FALLBACK_CAPS_FORMAT env can be used to force a specific format to be used as the only supported format
// by this sink. This is most useful for testing and debugging the rendering pipeline behavior for a given format.
static const char* forcedFallbackCapsFormat()
{
static char s_format[64] { };
static std::once_flag s_flag;
std::call_once(s_flag,
[&] {
const char* format = g_getenv("WEBKIT_GST_DMABUF_SINK_FORCED_FALLBACK_CAPS_FORMAT");
if (format)
g_strlcpy(const_cast<char*>(s_format), format, 64);
else
s_format[0] = 0;
});
if (!s_format[0])
return nullptr;
return s_format;
}
static void webKitDMABufVideoSinkConstructed(GObject* object)
{
GST_CALL_PARENT(G_OBJECT_CLASS, constructed, (object));
WebKitDMABufVideoSink* sink = WEBKIT_DMABUF_VIDEO_SINK(object);
sink->priv->appSink = makeGStreamerElement("appsink", "webkit-dmabuf-video-appsink");
ASSERT(sink->priv->appSink);
g_object_set(sink->priv->appSink.get(), "enable-last-sample", FALSE, "emit-signals", TRUE, "max-buffers", 1, nullptr);
gst_bin_add(GST_BIN_CAST(sink), sink->priv->appSink.get());
// This sink handles dmabuf data or raw data of any format in the supported format list.
// The dmabuf and raw data types are the two types of data we can handle via this sink (in combination with functionality in
// MediaPlayerPrivateGStreamer). The format list corresponds to the formats we are able to then handle in the graphics pipeline.
// In case of dmabuf data, that dmabuf is handled most optimally and just relayed to the graphics pipeline.
// In case of raw data, dmabuf objects are produced on the spot and filled with that data, and then pushed to the graphics pipeline.
static GstStaticCaps s_dmabufCaps = GST_STATIC_CAPS(
GST_VIDEO_CAPS_MAKE_WITH_FEATURES(GST_CAPS_FEATURE_MEMORY_DMABUF, GST_WEBKIT_DMABUF_SINK_CAPS_FORMAT_LIST));
static GstStaticCaps s_fallbackCaps = GST_STATIC_CAPS(GST_VIDEO_CAPS_MAKE(GST_WEBKIT_DMABUF_SINK_CAPS_FORMAT_LIST));
GRefPtr<GstCaps> caps = adoptGRef(gst_caps_new_empty());
{
if (forcedFallbackCapsFormat()) {
caps = gst_caps_new_simple("video/x-raw",
"format", G_TYPE_STRING, forcedFallbackCapsFormat(), nullptr);
} else {
gst_caps_append(caps.get(), gst_static_caps_get(&s_dmabufCaps));
gst_caps_append(caps.get(), gst_static_caps_get(&s_fallbackCaps));
}
}
g_object_set(sink->priv->appSink.get(), "caps", caps.get(), nullptr);
GRefPtr<GstPad> pad = adoptGRef(gst_element_get_static_pad(sink->priv->appSink.get(), "sink"));
gst_element_add_pad(GST_ELEMENT_CAST(sink), gst_ghost_pad_new("sink", pad.get()));
}
void webKitDMABufVideoSinkFinalize(GObject* object)
{
ASSERT(isMainThread());
WebKitDMABufVideoSink* sink = WEBKIT_DMABUF_VIDEO_SINK(object);
WebKitDMABufVideoSinkPrivate* priv = sink->priv;
if (priv->mediaPlayerPrivate)
g_signal_handlers_disconnect_by_data(priv->appSink.get(), priv->mediaPlayerPrivate);
GST_DEBUG_OBJECT(object, "WebKitDMABufVideoSink finalized.");
GST_CALL_PARENT(G_OBJECT_CLASS, finalize, (object));
}
static void webKitDMABufVideoSinkGetProperty(GObject* object, guint propertyId, GValue* value, GParamSpec* paramSpec)
{
WebKitDMABufVideoSink* sink = WEBKIT_DMABUF_VIDEO_SINK(object);
switch (propertyId) {
case PROP_STATS: {
GUniqueOutPtr<GstStructure> stats;
g_object_get(sink->priv->appSink.get(), "stats", &stats.outPtr(), nullptr);
gst_value_set_structure(value, stats.get());
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, propertyId, paramSpec);
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
static void webkit_dmabuf_video_sink_class_init(WebKitDMABufVideoSinkClass* klass)
{
GObjectClass* objectClass = G_OBJECT_CLASS(klass);
GstElementClass* elementClass = GST_ELEMENT_CLASS(klass);
objectClass->constructed = webKitDMABufVideoSinkConstructed;
objectClass->finalize = webKitDMABufVideoSinkFinalize;
objectClass->get_property = webKitDMABufVideoSinkGetProperty;
gst_element_class_add_pad_template(elementClass, gst_static_pad_template_get(&sinkTemplate));
gst_element_class_set_static_metadata(elementClass, "WebKit DMABuf video sink", "Sink/Video", "Renders video", "Zan Dobersek <zdobersek@igalia.com>");
g_object_class_install_property(objectClass, PROP_STATS, g_param_spec_boxed("stats",
nullptr, nullptr, GST_TYPE_STRUCTURE, static_cast<GParamFlags>(G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
}
bool webKitDMABufVideoSinkIsEnabled()
{
static bool s_disabled = false;
#if USE(GBM)
static std::once_flag s_flag;
std::call_once(s_flag, [&] {
const char* value = g_getenv("WEBKIT_GST_DMABUF_SINK_DISABLED");
s_disabled = value && (equalLettersIgnoringASCIICase(value, "true"_s) || equalLettersIgnoringASCIICase(value, "1"_s));
if (!s_disabled && !GBMDevice::singleton().device()) {
WTFLogAlways("Unable to access the GBM device, disabling DMABuf video sink.");
s_disabled = true;
}
});
#else
s_disabled = true;
#endif
return !s_disabled;
}
bool webKitDMABufVideoSinkProbePlatform()
{
return webkitGstCheckVersion(1, 20, 0) && isGStreamerPluginAvailable("app");
}
void webKitDMABufVideoSinkSetMediaPlayerPrivate(WebKitDMABufVideoSink* sink, MediaPlayerPrivateGStreamer* player)
{
WebKitDMABufVideoSinkPrivate* priv = sink->priv;
priv->mediaPlayerPrivate = player;
webKitVideoSinkSetMediaPlayerPrivate(priv->appSink.get(), priv->mediaPlayerPrivate);
}
#undef GST_CAT_DEFAULT
#endif // ENABLE(VIDEO)
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