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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 "GStreamerVideoSinkCommon.h"
#if ENABLE(VIDEO)
#include "MediaPlayerPrivateGStreamer.h"
#include <gst/app/gstappsink.h>
using namespace WebCore;
GST_DEBUG_CATEGORY(webkit_gst_video_sink_common_debug);
#define GST_CAT_DEFAULT webkit_gst_video_sink_common_debug
class WebKitVideoSinkProbe {
WTF_MAKE_FAST_ALLOCATED;
public:
WebKitVideoSinkProbe(MediaPlayerPrivateGStreamer* player)
: m_player(player)
{
}
static void deleteUserData(void* userData)
{
delete static_cast<WebKitVideoSinkProbe*>(userData);
}
static GstPadProbeReturn doProbe(GstPad* pad, GstPadProbeInfo* info, gpointer userData)
{
auto* self = static_cast<WebKitVideoSinkProbe*>(userData);
auto* player = self->m_player;
if (info->type & GST_PAD_PROBE_TYPE_EVENT_FLUSH) {
if (GST_EVENT_TYPE(GST_PAD_PROBE_INFO_EVENT(info)) == GST_EVENT_FLUSH_START) {
if (!self->m_isFlushing) {
GST_DEBUG_OBJECT(pad, "FLUSH_START received, aborting all pending tasks in the player sinkTaskQueue.");
self->m_isFlushing = true;
player->sinkTaskQueue().startAborting();
} else
GST_DEBUG_OBJECT(pad, "Received FLUSH_START while already flushing, ignoring.");
} else if (GST_EVENT_TYPE(GST_PAD_PROBE_INFO_EVENT(info)) == GST_EVENT_FLUSH_STOP) {
if (self->m_isFlushing) {
GST_DEBUG_OBJECT(pad, "FLUSH_STOP received, allowing operation in the player sinkTaskQueue again.");
self->m_isFlushing = false;
player->sinkTaskQueue().finishAborting();
} else
GST_DEBUG_OBJECT(pad, "Received FLUSH_STOP without a FLUSH_START, ignoring.");
}
}
if (info->type & GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM && GST_EVENT_TYPE(GST_PAD_PROBE_INFO_EVENT(info)) == GST_EVENT_TAG) {
GstTagList* tagList;
gst_event_parse_tag(GST_PAD_PROBE_INFO_EVENT(info), &tagList);
GST_DEBUG_OBJECT(pad, "Tag event received, video orientation may need to be updated. %" GST_PTR_FORMAT, tagList);
player->updateVideoOrientation(tagList);
}
if (info->type & GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM && GST_QUERY_TYPE(GST_PAD_PROBE_INFO_QUERY(info)) == GST_QUERY_ALLOCATION)
gst_query_add_allocation_meta(GST_PAD_PROBE_INFO_QUERY(info), GST_VIDEO_META_API_TYPE, nullptr);
#if USE(GSTREAMER_GL)
// FIXME: Verify the following comment. Investigate what actually should be done here.
//
// In some platforms (e.g. OpenMAX on the Raspberry Pi) when a resolution change occurs the
// pipeline has to be drained before a frame with the new resolution can be decoded.
// In this context, it's important that we don't hold references to any previous frame
// (e.g. m_sample) so that decoding can continue.
// We are also not supposed to keep the original frame after a flush.
//
// FIXME: We used to have code to call flushCurrentBuffer() on FLUSH_START. That code became
// accidentally unreachable in r287349. The current code doesn't preserve that call, partly
// because of a refactor of this probe function, partly because it seemed to caused test
// regressions that were out of the scope of that change.
//
// FIXME: flushCurrentBuffer(), when called, causes the video element to become blank for the
// user, and has been having this issue for a long time. This is definitely a bug, and needs
// to be fixed eventually.
//
// For more info: https://github.com/WebKit/WebKit/pull/3802#issuecomment-1234529142
if (info->type & GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM && GST_QUERY_TYPE(GST_PAD_PROBE_INFO_QUERY(info)) == GST_QUERY_DRAIN) {
GST_DEBUG_OBJECT(pad, "Flushing current buffer in response to %" GST_PTR_FORMAT, info->data);
player->flushCurrentBuffer();
}
#endif
return GST_PAD_PROBE_OK;
}
private:
MediaPlayerPrivateGStreamer* m_player;
bool m_isFlushing { false };
};
void webKitVideoSinkSetMediaPlayerPrivate(GstElement* appSink, MediaPlayerPrivateGStreamer* player)
{
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
GST_DEBUG_CATEGORY_INIT(webkit_gst_video_sink_common_debug, "webkitvideosinkcommon", 0, "WebKit Video Sink Common utilities");
});
g_signal_connect(appSink, "new-sample", G_CALLBACK(+[](GstElement* sink, MediaPlayerPrivateGStreamer* player) -> GstFlowReturn {
GRefPtr<GstSample> sample = adoptGRef(gst_app_sink_pull_sample(GST_APP_SINK(sink)));
GstBuffer* buffer = gst_sample_get_buffer(sample.get());
GST_TRACE_OBJECT(sink, "new-sample with PTS=%" GST_TIME_FORMAT, GST_TIME_ARGS(GST_BUFFER_PTS(buffer)));
player->triggerRepaint(WTFMove(sample));
return GST_FLOW_OK;
}), player);
g_signal_connect(appSink, "new-preroll", G_CALLBACK(+[](GstElement* sink, MediaPlayerPrivateGStreamer* player) -> GstFlowReturn {
GRefPtr<GstSample> sample = adoptGRef(gst_app_sink_pull_preroll(GST_APP_SINK(sink)));
GstBuffer* buffer = gst_sample_get_buffer(sample.get());
GST_DEBUG_OBJECT(sink, "new-preroll with PTS=%" GST_TIME_FORMAT, GST_TIME_ARGS(GST_BUFFER_PTS(buffer)));
player->triggerRepaint(WTFMove(sample));
return GST_FLOW_OK;
}), player);
GRefPtr<GstPad> pad = adoptGRef(gst_element_get_static_pad(appSink, "sink"));
gst_pad_add_probe(pad.get(), static_cast<GstPadProbeType>(GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM
| GST_PAD_PROBE_TYPE_EVENT_FLUSH | GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM),
WebKitVideoSinkProbe::doProbe, new WebKitVideoSinkProbe(player), WebKitVideoSinkProbe::deleteUserData);
}
#undef GST_CAT_DEFAULT
#endif // ENABLE(VIDEO)
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