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* 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
HeapVector<Member<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.
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;
}
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);
}
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 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;
}
}