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/*
* Copyright (C) 2016 Metrological Group B.V.
* Copyright (C) 2016 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 ENABLE(VIDEO) && USE(GSTREAMER) && ENABLE(MEDIA_SOURCE)
#include "AbortableTaskQueue.h"
#include "GStreamerCommon.h"
#include "MediaPlayerPrivateGStreamerMSE.h"
#include "SourceBufferPrivateGStreamer.h"
#include <atomic>
#include <gst/gst.h>
#include <mutex>
#include <wtf/Condition.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Threading.h>
namespace WebCore {
#if !LOG_DISABLED || ENABLE(ENCRYPTED_MEDIA)
struct PadProbeInformation {
AppendPipeline* appendPipeline;
const char* description;
gulong probeId;
};
#endif
class AppendPipeline {
WTF_MAKE_TZONE_ALLOCATED(AppendPipeline);
public:
AppendPipeline(SourceBufferPrivateGStreamer&, MediaPlayerPrivateGStreamerMSE&);
virtual ~AppendPipeline();
void pushNewBuffer(GRefPtr<GstBuffer>&&);
void resetParserState();
void stopParser();
SourceBufferPrivateGStreamer& sourceBufferPrivate() { return m_sourceBufferPrivate; }
MediaPlayerPrivateGStreamerMSE* playerPrivate() { return m_playerPrivate; }
private:
// Similar to TrackPrivateBaseGStreamer::TrackType, but with a new value (Invalid) for when the codec is
// not supported on this system, which should result in ParsingFailed error being thrown in SourceBuffer.
enum StreamType { Audio, Video, Text, Unknown, Invalid };
#ifndef GST_DISABLE_GST_DEBUG
static const char * streamTypeToString(StreamType);
#endif
static const char * streamTypeToStringLower(StreamType);
struct Track {
// Track objects are created on pad-added for the first initialization segment, and destroyed after
// the pipeline state has been set to GST_STATE_NULL.
WTF_MAKE_TZONE_ALLOCATED(Track);
WTF_MAKE_NONCOPYABLE(Track);
public:
Track(TrackID trackId, StreamType streamType, const GRefPtr<GstCaps>& caps, const FloatSize& presentationSize)
: trackId(trackId)
, streamType(streamType)
, caps(caps)
, presentationSize(presentationSize)
{ }
TrackID trackId;
StreamType streamType;
GRefPtr<GstCaps> caps;
GRefPtr<GstCaps> finalCaps;
FloatSize presentationSize;
// Needed by some formats. To simplify the code, parser/encoder can be a GstIdentity when not needed.
GRefPtr<GstElement> parser;
GRefPtr<GstElement> encoder;
GRefPtr<GstElement> appsink;
GRefPtr<GstPad> entryPad; // Sink pad of the parser/GstIdentity.
GRefPtr<GstPad> encoderPad; // Sink pad of the encoder/GstIdentity.
GRefPtr<GstPad> appsinkPad;
RefPtr<WebCore::TrackPrivateBase> webKitTrack;
#if !LOG_DISABLED
struct PadProbeInformation appsinkDataEnteringPadProbeInformation;
#endif
#if ENABLE(ENCRYPTED_MEDIA)
struct PadProbeInformation appsinkPadEventProbeInformation;
#endif
void emplaceOptionalEncoderForFormat(GstBin*, const GRefPtr<GstCaps>&);
void emplaceOptionalParserForFormat(GstBin*, const GRefPtr<GstCaps>&);
void initializeElements(AppendPipeline*, GstBin*);
bool isLinked() const { return gst_pad_is_linked(entryPad.get()); }
};
void handleErrorSyncMessage(GstMessage*);
void handleNeedContextSyncMessage(GstMessage*);
// For debug purposes only:
void handleStateChangeMessage(GstMessage*);
void handleAppsinkNewSampleFromStreamingThread(GstElement*);
void handleErrorCondition();
void handleErrorConditionFromStreamingThread();
void hookTrackEvents(Track&);
static std::tuple<GRefPtr<GstCaps>, AppendPipeline::StreamType, FloatSize> parseDemuxerSrcPadCaps(GstCaps*);
Ref<WebCore::TrackPrivateBase> makeWebKitTrack(Track& appendPipelineTrack, int trackIndex, TrackID);
void appsinkCapsChanged(Track&);
void appsinkNewSample(const Track&, GRefPtr<GstSample>&&);
void handleEndOfAppend();
void didReceiveInitializationSegment();
GstElement* pipeline() { return m_pipeline.get(); }
GstElement* appsrc() { return m_appsrc.get(); }
static AtomString generateTrackId(StreamType, int padIndex);
enum class CreateTrackResult { TrackCreated, TrackIgnored, AppendParsingFailed };
std::pair<CreateTrackResult, AppendPipeline::Track*> tryCreateTrackFromPad(GstPad* demuxerSrcPad);
bool recycleTrackForPad(GstPad*);
void linkPadWithTrack(GstPad* demuxerSrcPad, Track&);
void consumeAppsinksAvailableSamples();
GstPadProbeReturn appsrcEndOfAppendCheckerProbe(GstPadProbeInfo*);
static void staticInitialization();
static std::once_flag s_staticInitializationFlag;
static GType s_endOfAppendMetaType;
static const GstMetaInfo* s_webKitEndOfAppendMetaInfo;
// Used only for asserting that there is only one streaming thread.
// Only the pointers are compared.
Thread* m_streamingThread;
bool m_hasReceivedFirstInitializationSegment { false };
// Used only for asserting EOS events are only caused by demuxing errors.
bool m_errorReceived { false };
SourceBufferPrivateGStreamer& m_sourceBufferPrivate;
MediaPlayerPrivateGStreamerMSE* m_playerPrivate;
MediaTime m_initialDuration;
GRefPtr<GstElement> m_pipeline;
GRefPtr<GstElement> m_appsrc;
// To simplify the code, mtypefind and m_demux can be a GstIdentity when not needed.
GRefPtr<GstElement> m_typefind;
GRefPtr<GstElement> m_demux;
Vector<std::unique_ptr<Track>> m_tracks;
// Used to avoid unnecessary notifications per sample.
// It is read and written from the streaming thread and written from the main thread.
// The main thread must set it to false before actually pulling samples.
// This strategy ensures that at any time, there are at most two notifications in the bus
// queue, instead of it growing unbounded.
std::atomic_flag m_wasBusAlreadyNotifiedOfAvailableSamples;
#if !LOG_DISABLED
struct PadProbeInformation m_demuxerDataEnteringPadProbeInformation;
#endif
AbortableTaskQueue m_taskQueue;
};
} // namespace WebCore.
#endif // USE(GSTREAMER)
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