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/*
* Copyright (C) 2020, 2021 Metrological Group B.V.
* Copyright (C) 2020, 2021 Igalia, S.L
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "TrackQueue.h"
#if ENABLE(MEDIA_SOURCE) && USE(GSTREAMER)
GST_DEBUG_CATEGORY_EXTERN(webkit_mse_debug);
#define GST_CAT_DEFAULT webkit_mse_debug
namespace WebCore {
TrackQueue::TrackQueue(AtomString trackId)
: m_trackId(trackId)
{ }
void TrackQueue::enqueueObject(GRefPtr<GstMiniObject>&& object)
{
ASSERT(isMainThread());
ASSERT(GST_IS_SAMPLE(object.get()) || GST_IS_EVENT(object.get()));
if (GST_IS_SAMPLE(object.get())) {
GST_TRACE("TrackQueue for '%s': Putting object sample in the queue: %" GST_PTR_FORMAT " Buffer: %" GST_PTR_FORMAT ". notEmptyCallback currently %s.",
m_trackId.string().utf8().data(), object.get(), gst_sample_get_buffer(GST_SAMPLE(object.get())),
m_notEmptyCallback ? "set, will be called" : "unset");
} else {
GST_DEBUG("TrackQueue for '%s': Putting object event in the queue: %" GST_PTR_FORMAT ". notEmptyCallback currently %s.",
m_trackId.string().utf8().data(), object.get(),
m_notEmptyCallback ? "set, will be called" : "unset");
}
if (!m_notEmptyCallback)
m_queue.append(WTFMove(object));
else {
// If a low level callback was ever set, it had to be dispatched when the queue was empty at latest.
ASSERT(!m_lowLevelCallback);
NotEmptyHandler notEmptyCallback;
std::swap(notEmptyCallback, m_notEmptyCallback);
notEmptyCallback(WTFMove(object));
}
}
void TrackQueue::clear()
{
ASSERT(isMainThread());
m_queue.clear();
GST_DEBUG("TrackQueue for '%s': Emptied.", m_trackId.string().utf8().data());
// Notify main thread of low level reached if it proceeds.
checkLowLevel();
}
void TrackQueue::flush()
{
clear();
// If there was a callback in the streaming thread waiting for a sample to be added, cancel it.
if (m_notEmptyCallback) {
m_notEmptyCallback = nullptr;
GST_DEBUG("TrackQueue for '%s': notEmptyCallback unset.", m_trackId.string().utf8().data());
}
}
void TrackQueue::notifyWhenLowLevel(LowLevelHandler&& lowLevelCallback)
{
ASSERT(isMainThread());
GST_TRACE("TrackQueue for '%s': Setting lowLevelCallback%s.", m_trackId.string().utf8().data(),
m_lowLevelCallback ? " (previous callback will be discarded)" : "");
m_lowLevelCallback = WTFMove(lowLevelCallback);
checkLowLevel();
}
GRefPtr<GstMiniObject> TrackQueue::pop()
{
ASSERT(!isEmpty());
GRefPtr<GstMiniObject> object = m_queue.takeFirst();
if (GST_IS_SAMPLE(object.get())) {
GST_TRACE("TrackQueue for '%s': Popped object sample from the queue: %" GST_PTR_FORMAT " Buffer: %" GST_PTR_FORMAT,
m_trackId.string().utf8().data(), object.get(), gst_sample_get_buffer(GST_SAMPLE(object.get())));
} else {
GST_DEBUG("TrackQueue for '%s': Popped object event from the queue: %" GST_PTR_FORMAT,
m_trackId.string().utf8().data(), object.get());
}
checkLowLevel();
return object;
}
void TrackQueue::notifyWhenNotEmpty(NotEmptyHandler&& notEmptyCallback)
{
ASSERT(!isMainThread());
ASSERT(!m_notEmptyCallback);
m_notEmptyCallback = WTFMove(notEmptyCallback);
GST_TRACE("TrackQueue for '%s': notEmptyCallback set.", m_trackId.string().utf8().data());
}
void TrackQueue::resetNotEmptyHandler()
{
ASSERT(!isMainThread());
if (!m_notEmptyCallback)
return;
m_notEmptyCallback = nullptr;
GST_TRACE("TrackQueue for '%s': notEmptyCallback reset.", m_trackId.string().utf8().data());
}
void TrackQueue::checkLowLevel()
{
if (!m_lowLevelCallback || durationEnqueued() > s_durationEnqueuedLowWaterLevel)
return;
LowLevelHandler lowLevelCallback;
std::swap(lowLevelCallback, m_lowLevelCallback);
GST_TRACE("TrackQueue for '%s': lowLevelCallback called.", m_trackId.string().utf8().data());
lowLevelCallback();
}
GstClockTime TrackQueue::durationEnqueued() const
{
// Find the first and last GstSample in the queue and subtract their DTS.
auto frontIter = std::find_if(m_queue.begin(), m_queue.end(), [](const GRefPtr<GstMiniObject>& object) {
return GST_IS_SAMPLE(object.get());
});
// If there are no samples in the queue, that makes total duration of enqueued frames of zero.
if (frontIter == m_queue.end())
return 0;
auto backIter = std::find_if(m_queue.rbegin(), m_queue.rend(), [](const GRefPtr<GstMiniObject>& object) {
return GST_IS_SAMPLE(object.get());
});
const GstBuffer* front = gst_sample_get_buffer(GST_SAMPLE(frontIter->get()));
const GstBuffer* back = gst_sample_get_buffer(GST_SAMPLE(backIter->get()));
return GST_BUFFER_DTS_OR_PTS(back) - GST_BUFFER_DTS_OR_PTS(front);
}
#undef GST_CAT_DEFAULT
} // namespace WebCore
#endif // ENABLE(MEDIA_SOURCE) && USE(GSTREAMER)
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