TimeRanges* MediaSource::seekable() const
{
// Implements MediaSource algorithm for HTMLMediaElement.seekable.
// https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#htmlmediaelement-extensions
double sourceDuration = duration();
// If duration equals NaN: Return an empty TimeRanges object.
if (std::isnan(sourceDuration))
return TimeRanges::create();
// If duration equals positive Infinity:
if (sourceDuration == std::numeric_limits<double>::infinity()) {
TimeRanges* buffered = m_attachedElement->buffered();
// 1. If the HTMLMediaElement.buffered attribute returns an empty TimeRanges object, then
// return an empty TimeRanges object and abort these steps.
if (buffered->length() == 0)
return TimeRanges::create();
// 2. Return a single range with a start time of 0 and an end time equal to the highest end
// time reported by the HTMLMediaElement.buffered attribute.
return TimeRanges::create(0, buffered->end(buffered->length() - 1, ASSERT_NO_EXCEPTION));
}
// 3. Otherwise: Return a single range with a start time of 0 and an end time equal to duration.
return TimeRanges::create(0, sourceDuration);
}
TimeRanges* TimeRanges::copy() const {
TimeRanges* newSession = TimeRanges::create();
unsigned size = m_ranges.size();
for (unsigned i = 0; i < size; i++)
newSession->add(m_ranges[i].m_start, m_ranges[i].m_end);
return newSession;
}
TimeRanges* TimeRanges::create(const blink::WebTimeRanges& webRanges) {
TimeRanges* ranges = TimeRanges::create();
unsigned size = webRanges.size();
for (unsigned i = 0; i < size; ++i)
ranges->add(webRanges[i].start, webRanges[i].end);
return ranges;
}
void TimeRanges::unionWith(const TimeRanges* other) {
DCHECK(other);
TimeRanges* unioned = copy();
for (size_t index = 0; index < other->m_ranges.size(); ++index) {
const Range& range = other->m_ranges[index];
unioned->add(range.m_start, range.m_end);
}
m_ranges.swap(unioned->m_ranges);
}
static std::string ToString(const TimeRanges& ranges)
{
std::stringstream ss;
ss << "{";
for (unsigned i = 0; i < ranges.length(); ++i)
ss << " [" << ranges.start(i, IGNORE_EXCEPTION) << "," << ranges.end(i, IGNORE_EXCEPTION) << ")";
ss << " }";
return ss.str();
}
static std::string ToString(const TimeRanges& ranges)
{
std::stringstream ss;
ss << "{";
for (unsigned i = 0; i < ranges.length(); ++i)
ss << " [" << ranges.start(i).releaseReturnValue() << "," << ranges.end(i).releaseReturnValue() << ")";
ss << " }";
return ss.str();
}
void TimeRanges::intersectWith(const TimeRanges* other) {
DCHECK(other);
if (other == this)
return;
TimeRanges* invertedOther = other->copy();
invertedOther->invert();
invert();
unionWith(invertedOther);
invert();
}
PassRefPtr<TimeRanges> MediaSource::buffered() const
{
// Implements MediaSource algorithm for HTMLMediaElement.buffered.
// https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#htmlmediaelement-extensions
Vector<RefPtr<TimeRanges> > ranges(m_activeSourceBuffers->length());
for (size_t i = 0; i < m_activeSourceBuffers->length(); ++i)
ranges[i] = m_activeSourceBuffers->item(i)->buffered(ASSERT_NO_EXCEPTION);
// 1. If activeSourceBuffers.length equals 0 then return an empty TimeRanges object and abort these steps.
if (ranges.isEmpty())
return TimeRanges::create();
// 2. Let active ranges be the ranges returned by buffered for each SourceBuffer object in activeSourceBuffers.
// 3. Let highest end time be the largest range end time in the active ranges.
double highestEndTime = -1;
for (size_t i = 0; i < ranges.size(); ++i) {
unsigned length = ranges[i]->length();
if (length)
highestEndTime = std::max(highestEndTime, ranges[i]->end(length - 1, ASSERT_NO_EXCEPTION));
}
// Return an empty range if all ranges are empty.
if (highestEndTime < 0)
return TimeRanges::create();
// 4. Let intersection ranges equal a TimeRange object containing a single range from 0 to highest end time.
RefPtr<TimeRanges> intersectionRanges = TimeRanges::create(0, highestEndTime);
// 5. For each SourceBuffer object in activeSourceBuffers run the following steps:
bool ended = readyState() == endedKeyword();
for (size_t i = 0; i < ranges.size(); ++i) {
// 5.1 Let source ranges equal the ranges returned by the buffered attribute on the current SourceBuffer.
TimeRanges* sourceRanges = ranges[i].get();
// 5.2 If readyState is "ended", then set the end time on the last range in source ranges to highest end time.
if (ended && sourceRanges->length())
sourceRanges->add(sourceRanges->start(sourceRanges->length() - 1, ASSERT_NO_EXCEPTION), highestEndTime);
// 5.3 Let new intersection ranges equal the the intersection between the intersection ranges and the source ranges.
// 5.4 Replace the ranges in intersection ranges with the new intersection ranges.
intersectionRanges->intersectWith(sourceRanges);
}
return intersectionRanges.release();
}
/**
* Returns true if aValue is inside a range of aRanges, and put the range
* index in aIntervalIndex if it is not null.
* If aValue is not inside a range, false is returned, and aIntervalIndex, if
* not null, is set to the index of the range which ends immediately before aValue
* (and can be -1 if aValue is before aRanges.Start(0)).
*/
static bool
IsInRanges(TimeRanges& aRanges, double aValue, int32_t& aIntervalIndex)
{
uint32_t length;
aRanges.GetLength(&length);
for (uint32_t i = 0; i < length; i++) {
double start, end;
aRanges.Start(i, &start);
if (start > aValue) {
aIntervalIndex = i - 1;
return false;
}
aRanges.End(i, &end);
if (aValue <= end) {
aIntervalIndex = i;
return true;
}
}
aIntervalIndex = length - 1;
return false;
}
void TimeRanges::invert() {
TimeRanges* inverted = TimeRanges::create();
double posInf = std::numeric_limits<double>::infinity();
double negInf = -std::numeric_limits<double>::infinity();
if (!m_ranges.size()) {
inverted->add(negInf, posInf);
} else {
double start = m_ranges.first().m_start;
if (start != negInf)
inverted->add(negInf, start);
for (size_t index = 0; index + 1 < m_ranges.size(); ++index)
inverted->add(m_ranges[index].m_end, m_ranges[index + 1].m_start);
double end = m_ranges.last().m_end;
if (end != posInf)
inverted->add(end, posInf);
}
m_ranges.swap(inverted->m_ranges);
}
TimeRanges* MediaSource::seekable() const {
// Implements MediaSource algorithm for HTMLMediaElement.seekable.
// http://w3c.github.io/media-source/#htmlmediaelement-extensions
double sourceDuration = duration();
// If duration equals NaN: Return an empty TimeRanges object.
if (std::isnan(sourceDuration))
return TimeRanges::create();
// If duration equals positive Infinity:
if (sourceDuration == std::numeric_limits<double>::infinity()) {
TimeRanges* buffered = m_attachedElement->buffered();
// 1. If live seekable range is not empty:
if (m_liveSeekableRange->length() != 0) {
// 1.1. Let union ranges be the union of live seekable range and the
// HTMLMediaElement.buffered attribute.
// 1.2. Return a single range with a start time equal to the
// earliest start time in union ranges and an end time equal to
// the highest end time in union ranges and abort these steps.
if (buffered->length() == 0) {
return TimeRanges::create(
m_liveSeekableRange->start(0, ASSERT_NO_EXCEPTION),
m_liveSeekableRange->end(0, ASSERT_NO_EXCEPTION));
}
return TimeRanges::create(
std::min(m_liveSeekableRange->start(0, ASSERT_NO_EXCEPTION),
buffered->start(0, ASSERT_NO_EXCEPTION)),
std::max(m_liveSeekableRange->end(0, ASSERT_NO_EXCEPTION),
buffered->end(buffered->length() - 1, ASSERT_NO_EXCEPTION)));
}
// 2. If the HTMLMediaElement.buffered attribute returns an empty TimeRanges
// object, then return an empty TimeRanges object and abort these steps.
if (buffered->length() == 0)
return TimeRanges::create();
// 3. Return a single range with a start time of 0 and an end time equal to
// the highest end time reported by the HTMLMediaElement.buffered
// attribute.
return TimeRanges::create(
0, buffered->end(buffered->length() - 1, ASSERT_NO_EXCEPTION));
}
// 3. Otherwise: Return a single range with a start time of 0 and an end time
// equal to duration.
return TimeRanges::create(0, sourceDuration);
}
void
MediaSource::GetBuffered(TimeRanges* aBuffered)
{
MOZ_ASSERT(aBuffered->Length() == 0);
if (mActiveSourceBuffers->IsEmpty()) {
return;
}
double highestEndTime = 0;
nsTArray<nsRefPtr<TimeRanges>> activeRanges;
for (uint32_t i = 0; i < mActiveSourceBuffers->Length(); ++i) {
bool found;
SourceBuffer* sourceBuffer = mActiveSourceBuffers->IndexedGetter(i, found);
ErrorResult dummy;
*activeRanges.AppendElement() = sourceBuffer->GetBuffered(dummy);
highestEndTime = std::max(highestEndTime, activeRanges.LastElement()->GetEndTime());
}
TimeRanges* intersectionRanges = aBuffered;
intersectionRanges->Add(0, highestEndTime);
for (uint32_t i = 0; i < activeRanges.Length(); ++i) {
TimeRanges* sourceRanges = activeRanges[i];
if (mReadyState == MediaSourceReadyState::Ended) {
// Set the end time on the last range to highestEndTime by adding a
// new range spanning the current end time to highestEndTime, which
// Normalize() will then merge with the old last range.
sourceRanges->Add(sourceRanges->GetEndTime(), highestEndTime);
sourceRanges->Normalize();
}
intersectionRanges->Intersection(sourceRanges);
}
MSE_DEBUG("MediaSource(%p)::GetBuffered ranges=%s", this, DumpTimeRanges(intersectionRanges).get());
}
nsresult
MediaSourceReader::GetBuffered(dom::TimeRanges* aBuffered)
{
ReentrantMonitorAutoEnter mon(mDecoder->GetReentrantMonitor());
MOZ_ASSERT(aBuffered->Length() == 0);
if (mTrackBuffers.IsEmpty()) {
return NS_OK;
}
double highestEndTime = 0;
nsTArray<nsRefPtr<TimeRanges>> activeRanges;
for (uint32_t i = 0; i < mTrackBuffers.Length(); ++i) {
nsRefPtr<TimeRanges> r = new TimeRanges();
mTrackBuffers[i]->Buffered(r);
activeRanges.AppendElement(r);
highestEndTime = std::max(highestEndTime, activeRanges.LastElement()->GetEndTime());
}
TimeRanges* intersectionRanges = aBuffered;
intersectionRanges->Add(0, highestEndTime);
for (uint32_t i = 0; i < activeRanges.Length(); ++i) {
TimeRanges* sourceRanges = activeRanges[i];
if (IsEnded()) {
// Set the end time on the last range to highestEndTime by adding a
// new range spanning the current end time to highestEndTime, which
// Normalize() will then merge with the old last range.
sourceRanges->Add(sourceRanges->GetEndTime(), highestEndTime);
sourceRanges->Normalize();
}
intersectionRanges->Intersection(sourceRanges);
}
MSE_DEBUG("ranges=%s", DumpTimeRanges(intersectionRanges).get());
return NS_OK;
}
nsresult MediaDecoder::Seek(double aTime)
{
MOZ_ASSERT(NS_IsMainThread());
ReentrantMonitorAutoEnter mon(GetReentrantMonitor());
NS_ABORT_IF_FALSE(aTime >= 0.0, "Cannot seek to a negative value.");
TimeRanges seekable;
nsresult res;
uint32_t length = 0;
res = GetSeekable(&seekable);
NS_ENSURE_SUCCESS(res, NS_OK);
seekable.GetLength(&length);
if (!length) {
return NS_OK;
}
// If the position we want to seek to is not in a seekable range, we seek
// to the closest position in the seekable ranges instead. If two positions
// are equally close, we seek to the closest position from the currentTime.
// See seeking spec, point 7 :
// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#seeking
int32_t range = 0;
if (!IsInRanges(seekable, aTime, range)) {
if (range != -1) {
// |range + 1| can't be negative, because the only possible negative value
// for |range| is -1.
if (uint32_t(range + 1) < length) {
double leftBound, rightBound;
res = seekable.End(range, &leftBound);
NS_ENSURE_SUCCESS(res, NS_OK);
res = seekable.Start(range + 1, &rightBound);
NS_ENSURE_SUCCESS(res, NS_OK);
double distanceLeft = Abs(leftBound - aTime);
double distanceRight = Abs(rightBound - aTime);
if (distanceLeft == distanceRight) {
distanceLeft = Abs(leftBound - mCurrentTime);
distanceRight = Abs(rightBound - mCurrentTime);
}
aTime = (distanceLeft < distanceRight) ? leftBound : rightBound;
} else {
// Seek target is after the end last range in seekable data.
// Clamp the seek target to the end of the last seekable range.
res = seekable.End(length - 1, &aTime);
NS_ENSURE_SUCCESS(res, NS_OK);
}
} else {
// aTime is before the first range in |seekable|, the closest point we can
// seek to is the start of the first range.
seekable.Start(0, &aTime);
}
}
mRequestedSeekTime = aTime;
mCurrentTime = aTime;
// If we are already in the seeking state, then setting mRequestedSeekTime
// above will result in the new seek occurring when the current seek
// completes.
if (mPlayState != PLAY_STATE_SEEKING) {
bool paused = false;
if (mOwner) {
paused = mOwner->GetPaused();
}
mNextState = paused ? PLAY_STATE_PAUSED : PLAY_STATE_PLAYING;
PinForSeek();
ChangeState(PLAY_STATE_SEEKING);
}
return ScheduleStateMachineThread();
}
void MediaControlsPainter::paintMediaSliderInternal(const LayoutObject& object, const PaintInfo& paintInfo, const IntRect& rect)
{
const bool useNewUi = RuntimeEnabledFeatures::newMediaPlaybackUiEnabled();
const HTMLMediaElement* mediaElement = toParentMediaElement(object);
if (!mediaElement)
return;
const ComputedStyle& style = object.styleRef();
GraphicsContext* context = paintInfo.context;
// Paint the slider bar in the "no data buffered" state.
Color sliderBackgroundColor;
if (!useNewUi)
sliderBackgroundColor = Color(11, 11, 11);
else
sliderBackgroundColor = Color(0xda, 0xda, 0xda);
paintRoundedSliderBackground(rect, style, context, sliderBackgroundColor);
// Draw the buffered range. Since the element may have multiple buffered ranges and it'd be
// distracting/'busy' to show all of them, show only the buffered range containing the current play head.
TimeRanges* bufferedTimeRanges = mediaElement->buffered();
float duration = mediaElement->duration();
float currentTime = mediaElement->currentTime();
if (std::isnan(duration) || std::isinf(duration) || !duration || std::isnan(currentTime))
return;
for (unsigned i = 0; i < bufferedTimeRanges->length(); ++i) {
float start = bufferedTimeRanges->start(i, ASSERT_NO_EXCEPTION);
float end = bufferedTimeRanges->end(i, ASSERT_NO_EXCEPTION);
// The delta is there to avoid corner cases when buffered
// ranges is out of sync with current time because of
// asynchronous media pipeline and current time caching in
// HTMLMediaElement.
// This is related to https://www.w3.org/Bugs/Public/show_bug.cgi?id=28125
// FIXME: Remove this workaround when WebMediaPlayer
// has an asynchronous pause interface.
if (std::isnan(start) || std::isnan(end)
|| start > currentTime + kCurrentTimeBufferedDelta || end < currentTime)
continue;
int startPosition = int(start * rect.width() / duration);
int currentPosition = int(currentTime * rect.width() / duration);
int endPosition = int(end * rect.width() / duration);
if (!useNewUi) {
// Add half the thumb width proportionally adjusted to the current painting position.
int thumbCenter = mediaSliderThumbWidth / 2;
int addWidth = thumbCenter * (1.0 - 2.0 * currentPosition / rect.width());
currentPosition += addWidth;
}
// Draw highlight before current time.
Color startColor;
Color endColor;
if (!useNewUi) {
startColor = Color(195, 195, 195); // white-ish.
endColor = Color(217, 217, 217);
} else {
startColor = endColor = Color(0x42, 0x85, 0xf4); // blue.
}
if (currentPosition > startPosition)
paintSliderRangeHighlight(rect, style, context, startPosition, currentPosition, startColor, endColor);
// Draw grey-ish highlight after current time.
if (!useNewUi) {
startColor = Color(60, 60, 60);
endColor = Color(76, 76, 76);
} else {
startColor = endColor = Color(0x9f, 0x9f, 0x9f); // light grey.
}
if (endPosition > currentPosition)
paintSliderRangeHighlight(rect, style, context, currentPosition, endPosition, startColor, endColor);
return;
}
}