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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>
#include <wtf/TZoneMallocInlines.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_TZONE_ALLOCATED_INLINE(WebKitVideoSinkProbe);
public:
WebKitVideoSinkProbe(MediaPlayerPrivateGStreamer* player)
: m_player(player)
{
}
static void deleteUserData(void* userData)
{
delete static_cast<WebKitVideoSinkProbe*>(userData);
}
void handleFlushEvent([[maybe_unused]] GstPad* pad, GstPadProbeInfo* info)
{
// We need to operate from the main thread, this is a requirement for usage of
// AbortableTaskQueue start/finishAborting.
ASSERT(isMainThread());
if (GST_EVENT_TYPE(GST_PAD_PROBE_INFO_EVENT(info)) == GST_EVENT_FLUSH_START) {
if (!m_isFlushing) {
GST_DEBUG_OBJECT(pad, "FLUSH_START received, aborting all pending tasks in the player sinkTaskQueue.");
m_isFlushing = true;
m_player->sinkTaskQueue().startAborting();
#if USE(GSTREAMER_GL)
GST_DEBUG_OBJECT(pad, "Flushing current buffer in response to %" GST_PTR_FORMAT, info->data);
m_player->flushCurrentBuffer();
#endif
} else
GST_DEBUG_OBJECT(pad, "Received FLUSH_START while already flushing, ignoring.");
return;
}
RELEASE_ASSERT(GST_EVENT_TYPE(GST_PAD_PROBE_INFO_EVENT(info)) == GST_EVENT_FLUSH_STOP);
if (m_isFlushing) {
GST_DEBUG_OBJECT(pad, "FLUSH_STOP received, allowing operation in the player sinkTaskQueue again.");
m_isFlushing = false;
m_player->sinkTaskQueue().finishAborting();
return;
}
GST_DEBUG_OBJECT(pad, "Received FLUSH_STOP without a FLUSH_START, ignoring.");
}
static GstPadProbeReturn doProbe([[maybe_unused]] GstPad* pad, GstPadProbeInfo* info, gpointer userData)
{
auto* self = static_cast<WebKitVideoSinkProbe*>(userData);
auto* player = self->m_player;
// Usually flushes propagate in the main thread as a synchronous consequence of a seek.
// However, this doesn't have to be the case:
//
// As a notable example, when matroskademux receives a seek before it has parsed the
// entire file header, it stores the event and returns without flushing anything.
// Later, the streaming thread finishes parsing the file header and handles the stored
// seek event from that same thread. This sends a flush from the streaming thread.
if (info->type & GST_PAD_PROBE_TYPE_EVENT_FLUSH) {
callOnMainThreadAndWait([&] {
self->handleFlushEvent(pad, info);
});
}
if (self->m_isFlushing)
return GST_PAD_PROBE_OK; // do not process regular (non-flush) events during a flush
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) {
auto query = GST_PAD_PROBE_INFO_QUERY(info);
gst_query_add_allocation_meta(query, GST_VIDEO_META_API_TYPE, nullptr);
GstCaps* caps;
gboolean needPool;
gst_query_parse_allocation(query, &caps, &needPool);
if (UNLIKELY(!caps) || !needPool)
return GST_PAD_PROBE_OK;
unsigned size;
#if GST_CHECK_VERSION(1, 24, 0)
if (gst_video_is_dma_drm_caps(caps)) {
GstVideoInfoDmaDrm drmInfo;
if (!gst_video_info_dma_drm_from_caps(&drmInfo, caps))
return GST_PAD_PROBE_OK;
size = GST_VIDEO_INFO_SIZE(&drmInfo.vinfo);
} else
#endif
{
GstVideoInfo info;
if (!gst_video_info_from_caps(&info, caps))
return GST_PAD_PROBE_OK;
size = GST_VIDEO_INFO_SIZE(&info);
}
gst_query_add_allocation_pool(query, nullptr, size, 3, 0);
}
#if USE(GSTREAMER_GL)
// 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.
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)));
#ifndef GST_DISABLE_GST_DEBUG
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)));
#endif
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)));
#ifndef GST_DISABLE_GST_DEBUG
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)));
#endif
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);
if (!player->requiresVideoSinkCapsNotifications())
return;
g_signal_connect(pad.get(), "notify::caps", G_CALLBACK(+[](GstPad* videoSinkPad, GParamSpec*, MediaPlayerPrivateGStreamer* player) {
player->videoSinkCapsChanged(videoSinkPad);
}), player);
}
#undef GST_CAT_DEFAULT
#endif // ENABLE(VIDEO)
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