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/*
* Copyright (C) 2023 Igalia S.L
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* aint with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#if USE(GSTREAMER)
#include "GRefPtrGStreamer.h"
#include <wtf/Deque.h>
#include <wtf/FastMalloc.h>
#include <wtf/Forward.h>
#include <wtf/Lock.h>
#include <wtf/ThreadSafeRefCounted.h>
namespace WebCore {
class GStreamerElementHarness : public ThreadSafeRefCounted<GStreamerElementHarness> {
WTF_MAKE_FAST_ALLOCATED;
public:
class Stream : public ThreadSafeRefCounted<Stream> {
WTF_MAKE_FAST_ALLOCATED;
public:
static Ref<Stream> create(GRefPtr<GstPad>&& pad, RefPtr<GStreamerElementHarness>&& downstreamHarness)
{
return adoptRef(*new Stream(WTFMove(pad), WTFMove(downstreamHarness)));
}
~Stream();
GRefPtr<GstBuffer> pullBuffer();
GRefPtr<GstEvent> pullEvent();
bool sendEvent(GstEvent*);
const GRefPtr<GstPad>& pad() const { return m_pad; }
const GRefPtr<GstPad>& targetPad() const { return m_targetPad; }
const GRefPtr<GstCaps>& outputCaps();
const RefPtr<GStreamerElementHarness> downstreamHarness() const { return m_downstreamHarness; }
private:
Stream(GRefPtr<GstPad>&&, RefPtr<GStreamerElementHarness>&&);
GstFlowReturn chainBuffer(GstBuffer*);
bool sinkEvent(GstEvent*);
GRefPtr<GstPad> m_pad;
RefPtr<GStreamerElementHarness> m_downstreamHarness;
GRefPtr<GstPad> m_targetPad;
Lock m_bufferQueueLock;
Deque<GRefPtr<GstBuffer>> m_bufferQueue WTF_GUARDED_BY_LOCK(m_bufferQueueLock);
Lock m_sinkEventQueueLock;
Deque<GRefPtr<GstEvent>> m_sinkEventQueue WTF_GUARDED_BY_LOCK(m_sinkEventQueueLock);
GRefPtr<GstCaps> m_outputCaps WTF_GUARDED_BY_LOCK(m_sinkEventQueueLock);
};
using PadLinkCallback = Function<RefPtr<GStreamerElementHarness>(const GRefPtr<GstPad>&)>;
using ProcessBufferCallback = Function<void(Stream&, const GRefPtr<GstBuffer>&)>;
static Ref<GStreamerElementHarness> create(GRefPtr<GstElement>&& element, ProcessBufferCallback&& processOutputBufferCallback, std::optional<PadLinkCallback> padLinkCallback = std::nullopt)
{
return adoptRef(*new GStreamerElementHarness(WTFMove(element), WTFMove(processOutputBufferCallback), WTFMove(padLinkCallback)));
}
~GStreamerElementHarness();
void start(GRefPtr<GstCaps>&&);
bool isStarted() const { return m_playing.loadRelaxed(); }
bool pushSample(GRefPtr<GstSample>&&);
bool pushBuffer(GRefPtr<GstBuffer>&&);
bool pushEvent(GRefPtr<GstEvent>&&);
GstPad* inputPad() const { return m_srcPad.get(); }
const GRefPtr<GstCaps>& inputCaps() const { return m_inputCaps; }
const Vector<RefPtr<Stream>>& outputStreams() const { return m_outputStreams; }
GstElement* element() const { return m_element.get(); }
void processOutputBuffers();
void flush();
bool flushBuffers();
void dumpGraph(const char* filenamePrefix);
private:
GStreamerElementHarness(GRefPtr<GstElement>&&, ProcessBufferCallback&&, std::optional<PadLinkCallback>&&);
GstFlowReturn pushBufferFull(GRefPtr<GstBuffer>&&);
bool srcQuery(GstPad*, GstObject*, GstQuery*);
bool srcEvent(GstEvent*);
void pushStickyEvents(GRefPtr<GstCaps>&&);
GRefPtr<GstElement> m_element;
ProcessBufferCallback m_processOutputBufferCallback;
std::optional<PadLinkCallback> m_padLinkCallback;
GRefPtr<GstCaps> m_inputCaps;
GRefPtr<GstPad> m_srcPad;
Vector<RefPtr<Stream>> m_outputStreams;
Lock m_srcEventQueueLock;
Deque<GRefPtr<GstEvent>> m_srcEventQueue WTF_GUARDED_BY_LOCK(m_srcEventQueueLock);
Atomic<bool> m_playing { false };
Atomic<bool> m_stickyEventsSent { false };
};
} // namespace WebCore
#endif // USE(GSTREAMER)
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