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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
* Copyright (C) 2013-2017 Apple Inc. All rights reserved.
*
* 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 "MediaSource.h"
#if ENABLE(MEDIA_SOURCE)
#include "AudioTrackList.h"
#include "ContentType.h"
#include "Event.h"
#include "EventNames.h"
#include "HTMLMediaElement.h"
#include "Logging.h"
#include "MediaSourcePrivate.h"
#include "MediaSourceRegistry.h"
#include "SourceBuffer.h"
#include "SourceBufferList.h"
#include "SourceBufferPrivate.h"
#include "TextTrackList.h"
#include "TimeRanges.h"
#include "VideoTrackList.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(MediaSource);
String convertEnumerationToString(MediaSourcePrivate::AddStatus enumerationValue)
{
static const NeverDestroyed<String> values[] = {
MAKE_STATIC_STRING_IMPL("Ok"),
MAKE_STATIC_STRING_IMPL("NotSupported"),
MAKE_STATIC_STRING_IMPL("ReachedIdLimit"),
};
static_assert(static_cast<size_t>(MediaSourcePrivate::AddStatus::Ok) == 0, "MediaSourcePrivate::AddStatus::Ok is not 0 as expected");
static_assert(static_cast<size_t>(MediaSourcePrivate::AddStatus::NotSupported) == 1, "MediaSourcePrivate::AddStatus::NotSupported is not 1 as expected");
static_assert(static_cast<size_t>(MediaSourcePrivate::AddStatus::ReachedIdLimit) == 2, "MediaSourcePrivate::AddStatus::ReachedIdLimit is not 2 as expected");
ASSERT(static_cast<size_t>(enumerationValue) < WTF_ARRAY_LENGTH(values));
return values[static_cast<size_t>(enumerationValue)];
}
String convertEnumerationToString(MediaSourcePrivate::EndOfStreamStatus enumerationValue)
{
static const NeverDestroyed<String> values[] = {
MAKE_STATIC_STRING_IMPL("EosNoError"),
MAKE_STATIC_STRING_IMPL("EosNetworkError"),
MAKE_STATIC_STRING_IMPL("EosDecodeError"),
};
static_assert(static_cast<size_t>(MediaSourcePrivate::EndOfStreamStatus::EosNoError) == 0, "MediaSourcePrivate::EndOfStreamStatus::EosNoError is not 0 as expected");
static_assert(static_cast<size_t>(MediaSourcePrivate::EndOfStreamStatus::EosNetworkError) == 1, "MediaSourcePrivate::EndOfStreamStatus::EosNetworkError is not 1 as expected");
static_assert(static_cast<size_t>(MediaSourcePrivate::EndOfStreamStatus::EosDecodeError) == 2, "MediaSourcePrivate::EndOfStreamStatus::EosDecodeError is not 2 as expected");
ASSERT(static_cast<size_t>(enumerationValue) < WTF_ARRAY_LENGTH(values));
return values[static_cast<size_t>(enumerationValue)];
}
URLRegistry* MediaSource::s_registry;
void MediaSource::setRegistry(URLRegistry* registry)
{
ASSERT(!s_registry);
s_registry = registry;
}
Ref<MediaSource> MediaSource::create(ScriptExecutionContext& context)
{
auto mediaSource = adoptRef(*new MediaSource(context));
mediaSource->suspendIfNeeded();
return mediaSource;
}
MediaSource::MediaSource(ScriptExecutionContext& context)
: ActiveDOMObject(&context)
, m_duration(MediaTime::invalidTime())
, m_pendingSeekTime(MediaTime::invalidTime())
, m_asyncEventQueue(MainThreadGenericEventQueue::create(*this))
#if !RELEASE_LOG_DISABLED
, m_logger(downcast<Document>(context).logger())
#endif
{
m_sourceBuffers = SourceBufferList::create(scriptExecutionContext());
m_activeSourceBuffers = SourceBufferList::create(scriptExecutionContext());
}
MediaSource::~MediaSource()
{
ALWAYS_LOG(LOGIDENTIFIER);
ASSERT(isClosed());
}
void MediaSource::setPrivateAndOpen(Ref<MediaSourcePrivate>&& mediaSourcePrivate)
{
DEBUG_LOG(LOGIDENTIFIER);
ASSERT(!m_private);
ASSERT(m_mediaElement);
m_private = WTFMove(mediaSourcePrivate);
// 2.4.1 Attaching to a media element
// https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#mediasource-attach
// ↳ If readyState is NOT set to "closed"
// Run the "If the media data cannot be fetched at all, due to network errors, causing the user agent to give up trying
// to fetch the resource" steps of the resource fetch algorithm's media data processing steps list.
if (!isClosed()) {
m_mediaElement->mediaLoadingFailedFatally(MediaPlayer::NetworkState::NetworkError);
return;
}
// ↳ Otherwise
// 1. Set the media element's delaying-the-load-event-flag to false.
m_mediaElement->setShouldDelayLoadEvent(false);
// 2. Set the readyState attribute to "open".
// 3. Queue a task to fire a simple event named sourceopen at the MediaSource.
setReadyState(ReadyState::Open);
// 4. Continue the resource fetch algorithm by running the remaining "Otherwise (mode is local)" steps,
// with these clarifications:
// NOTE: This is handled in HTMLMediaElement.
}
void MediaSource::addedToRegistry()
{
DEBUG_LOG(LOGIDENTIFIER);
setPendingActivity(*this);
}
void MediaSource::removedFromRegistry()
{
DEBUG_LOG(LOGIDENTIFIER);
unsetPendingActivity(*this);
}
MediaTime MediaSource::duration() const
{
return m_duration;
}
void MediaSource::durationChanged(const MediaTime& duration)
{
ALWAYS_LOG(LOGIDENTIFIER, duration);
m_duration = duration;
}
MediaTime MediaSource::currentTime() const
{
return m_mediaElement ? m_mediaElement->currentMediaTime() : MediaTime::zeroTime();
}
std::unique_ptr<PlatformTimeRanges> MediaSource::buffered() const
{
if (m_buffered && m_activeSourceBuffers->length() && std::all_of(m_activeSourceBuffers->begin(), m_activeSourceBuffers->end(), [](auto& buffer) { return !buffer->isBufferedDirty(); }))
return makeUnique<PlatformTimeRanges>(*m_buffered);
m_buffered = makeUnique<PlatformTimeRanges>();
for (auto& sourceBuffer : *m_activeSourceBuffers)
sourceBuffer->setBufferedDirty(false);
// Implements MediaSource algorithm for HTMLMediaElement.buffered.
// https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#htmlmediaelement-extensions
Vector<PlatformTimeRanges> activeRanges = this->activeRanges();
// 1. If activeSourceBuffers.length equals 0 then return an empty TimeRanges object and abort these steps.
if (activeRanges.isEmpty())
return makeUnique<PlatformTimeRanges>(*m_buffered);
// 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.
MediaTime highestEndTime = MediaTime::zeroTime();
for (auto& ranges : activeRanges) {
unsigned length = ranges.length();
if (length)
highestEndTime = std::max(highestEndTime, ranges.end(length - 1));
}
// Return an empty range if all ranges are empty.
if (!highestEndTime)
return makeUnique<PlatformTimeRanges>(*m_buffered);
// 4. Let intersection ranges equal a TimeRange object containing a single range from 0 to highest end time.
m_buffered->add(MediaTime::zeroTime(), highestEndTime);
// 5. For each SourceBuffer object in activeSourceBuffers run the following steps:
bool ended = readyState() == ReadyState::Ended;
for (auto& sourceRanges : activeRanges) {
// 5.1 Let source ranges equal the ranges returned by the buffered attribute on the current SourceBuffer.
// 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), highestEndTime);
// 5.3 Let new intersection ranges equal the intersection between the intersection ranges and the source ranges.
// 5.4 Replace the ranges in intersection ranges with the new intersection ranges.
m_buffered->intersectWith(sourceRanges);
}
return makeUnique<PlatformTimeRanges>(*m_buffered);
}
void MediaSource::seekToTime(const MediaTime& time)
{
if (isClosed())
return;
ALWAYS_LOG(LOGIDENTIFIER, time);
// 2.4.3 Seeking
// https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#mediasource-seeking
m_pendingSeekTime = time;
// Run the following steps as part of the "Wait until the user agent has established whether or not the
// media data for the new playback position is available, and, if it is, until it has decoded enough data
// to play back that position" step of the seek algorithm:
// ↳ If new playback position is not in any TimeRange of HTMLMediaElement.buffered
if (!hasBufferedTime(time)) {
// 1. If the HTMLMediaElement.readyState attribute is greater than HAVE_METADATA,
// then set the HTMLMediaElement.readyState attribute to HAVE_METADATA.
m_private->setReadyState(MediaPlayer::ReadyState::HaveMetadata);
// 2. The media element waits until an appendBuffer() or an appendStream() call causes the coded
// frame processing algorithm to set the HTMLMediaElement.readyState attribute to a value greater
// than HAVE_METADATA.
m_private->waitForSeekCompleted();
return;
}
// ↳ Otherwise
// Continue
// https://bugs.webkit.org/show_bug.cgi?id=125157 broke seek on MediaPlayerPrivateGStreamerMSE
#if !USE(GSTREAMER)
m_private->waitForSeekCompleted();
#endif
completeSeek();
}
void MediaSource::completeSeek()
{
if (isClosed())
return;
// 2.4.3 Seeking, ctd.
// https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#mediasource-seeking
ASSERT(m_pendingSeekTime.isValid());
ALWAYS_LOG(LOGIDENTIFIER, m_pendingSeekTime);
// 2. The media element resets all decoders and initializes each one with data from the appropriate
// initialization segment.
// 3. The media element feeds coded frames from the active track buffers into the decoders starting
// with the closest random access point before the new playback position.
MediaTime pendingSeekTime = m_pendingSeekTime;
m_pendingSeekTime = MediaTime::invalidTime();
for (auto& sourceBuffer : *m_activeSourceBuffers)
sourceBuffer->seekToTime(pendingSeekTime);
// 4. Resume the seek algorithm at the "Await a stable state" step.
m_private->seekCompleted();
monitorSourceBuffers();
}
Ref<TimeRanges> MediaSource::seekable()
{
// 6. HTMLMediaElement Extensions, seekable
// W3C Editor's Draft 16 September 2016
// https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#htmlmediaelement-extensions
// ↳ If duration equals NaN:
// Return an empty TimeRanges object.
if (m_duration.isInvalid())
return TimeRanges::create();
// ↳ If duration equals positive Infinity:
if (m_duration.isPositiveInfinite()) {
auto buffered = this->buffered();
// If live seekable range is not empty:
if (m_liveSeekable && m_liveSeekable->length()) {
// Let union ranges be the union of live seekable range and the HTMLMediaElement.buffered attribute.
buffered->unionWith(*m_liveSeekable);
// 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.
buffered->add(buffered->start(0), buffered->maximumBufferedTime());
return TimeRanges::create(*buffered);
}
// If the HTMLMediaElement.buffered attribute returns an empty TimeRanges object, then return
// an empty TimeRanges object and abort these steps.
if (!buffered->length())
return TimeRanges::create();
// 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({MediaTime::zeroTime(), buffered->maximumBufferedTime()});
}
// ↳ Otherwise:
// Return a single range with a start time of 0 and an end time equal to duration.
return TimeRanges::create({MediaTime::zeroTime(), m_duration});
}
ExceptionOr<void> MediaSource::setLiveSeekableRange(double start, double end)
{
// W3C Editor's Draft 16 September 2016
// https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#dom-mediasource-setliveseekablerange
ALWAYS_LOG(LOGIDENTIFIER, "start = ", start, ", end = ", end);
// If the readyState attribute is not "open" then throw an InvalidStateError exception and abort these steps.
if (!isOpen())
return Exception { InvalidStateError };
// If start is negative or greater than end, then throw a TypeError exception and abort these steps.
if (start < 0 || start > end)
return Exception { TypeError };
// Set live seekable range to be a new normalized TimeRanges object containing a single range
// whose start position is start and end position is end.
m_liveSeekable = makeUnique<PlatformTimeRanges>(MediaTime::createWithDouble(start), MediaTime::createWithDouble(end));
return { };
}
ExceptionOr<void> MediaSource::clearLiveSeekableRange()
{
// W3C Editor's Draft 16 September 2016
// https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#dom-mediasource-clearliveseekablerange
ALWAYS_LOG(LOGIDENTIFIER);
// If the readyState attribute is not "open" then throw an InvalidStateError exception and abort these steps.
if (!isOpen())
return Exception { InvalidStateError };
m_liveSeekable = nullptr;
return { };
}
const MediaTime& MediaSource::currentTimeFudgeFactor()
{
// Allow hasCurrentTime() to be off by as much as the length of two 24fps video frames
static NeverDestroyed<MediaTime> fudgeFactor(2002, 24000);
return fudgeFactor;
}
bool MediaSource::contentTypeShouldGenerateTimestamps(const ContentType& contentType)
{
return contentType.containerType() == "audio/aac" || contentType.containerType() == "audio/mpeg";
}
bool MediaSource::hasBufferedTime(const MediaTime& time)
{
if (time > duration())
return false;
auto ranges = buffered();
if (!ranges->length())
return false;
return abs(ranges->nearest(time) - time) <= currentTimeFudgeFactor();
}
bool MediaSource::hasCurrentTime()
{
return hasBufferedTime(currentTime());
}
bool MediaSource::hasFutureTime()
{
MediaTime currentTime = this->currentTime();
MediaTime duration = this->duration();
if (currentTime >= duration)
return true;
auto ranges = buffered();
MediaTime nearest = ranges->nearest(currentTime);
if (abs(nearest - currentTime) > currentTimeFudgeFactor())
return false;
size_t found = ranges->find(nearest);
if (found == notFound)
return false;
MediaTime localEnd = ranges->end(found);
if (localEnd == duration)
return true;
return localEnd - currentTime > currentTimeFudgeFactor();
}
void MediaSource::monitorSourceBuffers()
{
if (isClosed())
return;
// 2.4.4 SourceBuffer Monitoring
// https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#buffer-monitoring
// Note, the behavior if activeSourceBuffers is empty is undefined.
if (!m_activeSourceBuffers) {
m_private->setReadyState(MediaPlayer::ReadyState::HaveNothing);
return;
}
// ↳ If the HTMLMediaElement.readyState attribute equals HAVE_NOTHING:
if (mediaElement()->readyState() == HTMLMediaElement::HAVE_NOTHING) {
// 1. Abort these steps.
return;
}
// ↳ If HTMLMediaElement.buffered does not contain a TimeRange for the current playback position:
if (!hasCurrentTime()) {
// 1. Set the HTMLMediaElement.readyState attribute to HAVE_METADATA.
// 2. If this is the first transition to HAVE_METADATA, then queue a task to fire a simple event
// named loadedmetadata at the media element.
m_private->setReadyState(MediaPlayer::ReadyState::HaveMetadata);
// 3. Abort these steps.
return;
}
// ↳ If HTMLMediaElement.buffered contains a TimeRange that includes the current
// playback position and enough data to ensure uninterrupted playback:
auto ranges = buffered();
if (std::all_of(m_activeSourceBuffers->begin(), m_activeSourceBuffers->end(), [&](auto& sourceBuffer) {
return sourceBuffer->canPlayThroughRange(*ranges);
})) {
// 1. Set the HTMLMediaElement.readyState attribute to HAVE_ENOUGH_DATA.
// 2. Queue a task to fire a simple event named canplaythrough at the media element.
// 3. Playback may resume at this point if it was previously suspended by a transition to HAVE_CURRENT_DATA.
m_private->setReadyState(MediaPlayer::ReadyState::HaveEnoughData);
if (m_pendingSeekTime.isValid())
completeSeek();
// 4. Abort these steps.
return;
}
// ↳ If HTMLMediaElement.buffered contains a TimeRange that includes the current playback
// position and some time beyond the current playback position, then run the following steps:
if (hasFutureTime()) {
// 1. Set the HTMLMediaElement.readyState attribute to HAVE_FUTURE_DATA.
// 2. If the previous value of HTMLMediaElement.readyState was less than HAVE_FUTURE_DATA, then queue a task to fire a simple event named canplay at the media element.
// 3. Playback may resume at this point if it was previously suspended by a transition to HAVE_CURRENT_DATA.
m_private->setReadyState(MediaPlayer::ReadyState::HaveFutureData);
if (m_pendingSeekTime.isValid())
completeSeek();
// 4. Abort these steps.
return;
}
// ↳ If HTMLMediaElement.buffered contains a TimeRange that ends at the current playback position and does not have a range covering the time immediately after the current position:
// NOTE: Logically, !(all objects do not contain currentTime) == (some objects contain current time)
// 1. Set the HTMLMediaElement.readyState attribute to HAVE_CURRENT_DATA.
// 2. If this is the first transition to HAVE_CURRENT_DATA, then queue a task to fire a simple
// event named loadeddata at the media element.
// 3. Playback is suspended at this point since the media element doesn't have enough data to
// advance the media timeline.
m_private->setReadyState(MediaPlayer::ReadyState::HaveCurrentData);
if (m_pendingSeekTime.isValid())
completeSeek();
// 4. Abort these steps.
}
ExceptionOr<void> MediaSource::setDuration(double duration)
{
// 2.1 Attributes - Duration
// https://www.w3.org/TR/2016/REC-media-source-20161117/#attributes
ALWAYS_LOG(LOGIDENTIFIER, duration);
// On setting, run the following steps:
// 1. If the value being set is negative or NaN then throw a TypeError exception and abort these steps.
if (duration < 0.0 || std::isnan(duration))
return Exception { TypeError };
// 2. If the readyState attribute is not "open" then throw an InvalidStateError exception and abort these steps.
if (!isOpen())
return Exception { InvalidStateError };
// 3. If the updating attribute equals true on any SourceBuffer in sourceBuffers, then throw an InvalidStateError
// exception and abort these steps.
for (auto& sourceBuffer : *m_sourceBuffers) {
if (sourceBuffer->updating())
return Exception { InvalidStateError };
}
// 4. Run the duration change algorithm with new duration set to the value being assigned to this attribute.
return setDurationInternal(MediaTime::createWithDouble(duration));
}
ExceptionOr<void> MediaSource::setDurationInternal(const MediaTime& duration)
{
// 2.4.6 Duration Change
// https://www.w3.org/TR/2016/REC-media-source-20161117/#duration-change-algorithm
MediaTime newDuration = duration;
// 1. If the current value of duration is equal to new duration, then return.
if (newDuration == m_duration)
return { };
// 2. If new duration is less than the highest presentation timestamp of any buffered coded frames
// for all SourceBuffer objects in sourceBuffers, then throw an InvalidStateError exception and
// abort these steps.
// 3. Let highest end time be the largest track buffer ranges end time across all the track buffers
// across all SourceBuffer objects in sourceBuffers.
MediaTime highestPresentationTimestamp;
MediaTime highestEndTime;
for (auto& sourceBuffer : *m_sourceBuffers) {
highestPresentationTimestamp = std::max(highestPresentationTimestamp, sourceBuffer->highestPresentationTimestamp());
highestEndTime = std::max(highestEndTime, sourceBuffer->bufferedInternal().ranges().maximumBufferedTime());
}
if (highestPresentationTimestamp.isValid() && newDuration < highestPresentationTimestamp)
return Exception { InvalidStateError };
// 4. If new duration is less than highest end time, then
// 4.1. Update new duration to equal highest end time.
if (highestEndTime.isValid() && newDuration < highestEndTime)
newDuration = highestEndTime;
// 5. Update duration to new duration.
m_duration = newDuration;
ALWAYS_LOG(LOGIDENTIFIER, duration);
// 6. Update the media duration to new duration and run the HTMLMediaElement duration change algorithm.
m_private->durationChanged();
return { };
}
void MediaSource::setReadyState(ReadyState state)
{
auto oldState = readyState();
if (oldState == state)
return;
m_readyState = state;
onReadyStateChange(oldState, state);
}
ExceptionOr<void> MediaSource::endOfStream(Optional<EndOfStreamError> error)
{
ALWAYS_LOG(LOGIDENTIFIER);
// 2.2 https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-MediaSource-endOfStream-void-EndOfStreamError-error
// 1. If the readyState attribute is not in the "open" state then throw an
// InvalidStateError exception and abort these steps.
if (!isOpen())
return Exception { InvalidStateError };
// 2. If the updating attribute equals true on any SourceBuffer in sourceBuffers, then throw an
// InvalidStateError exception and abort these steps.
if (std::any_of(m_sourceBuffers->begin(), m_sourceBuffers->end(), [](auto& sourceBuffer) { return sourceBuffer->updating(); }))
return Exception { InvalidStateError };
// 3. Run the end of stream algorithm with the error parameter set to error.
streamEndedWithError(error);
return { };
}
void MediaSource::streamEndedWithError(Optional<EndOfStreamError> error)
{
#if !RELEASE_LOG_DISABLED
if (error)
ALWAYS_LOG(LOGIDENTIFIER, error.value());
else
ALWAYS_LOG(LOGIDENTIFIER);
#endif
if (isClosed())
return;
// 2.4.7 https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#end-of-stream-algorithm
// 1. Change the readyState attribute value to "ended".
// 2. Queue a task to fire a simple event named sourceended at the MediaSource.
setReadyState(ReadyState::Ended);
// 3.
if (!error) {
// ↳ If error is not set, is null, or is an empty string
// 1. Run the duration change algorithm with new duration set to the highest end time reported by
// the buffered attribute across all SourceBuffer objects in sourceBuffers.
MediaTime maxEndTime;
for (auto& sourceBuffer : *m_sourceBuffers) {
if (auto length = sourceBuffer->bufferedInternal().length())
maxEndTime = std::max(sourceBuffer->bufferedInternal().ranges().end(length - 1), maxEndTime);
}
setDurationInternal(maxEndTime);
// 2. Notify the media element that it now has all of the media data.
for (auto& sourceBuffer : *m_sourceBuffers)
sourceBuffer->trySignalAllSamplesEnqueued();
m_private->markEndOfStream(MediaSourcePrivate::EosNoError);
} else if (error == EndOfStreamError::Network) {
// ↳ If error is set to "network"
ASSERT(m_mediaElement);
if (m_mediaElement->readyState() == HTMLMediaElement::HAVE_NOTHING) {
// ↳ If the HTMLMediaElement.readyState attribute equals HAVE_NOTHING
// Run the "If the media data cannot be fetched at all, due to network errors, causing
// the user agent to give up trying to fetch the resource" steps of the resource fetch algorithm.
// NOTE: This step is handled by HTMLMediaElement::mediaLoadingFailed().
m_mediaElement->mediaLoadingFailed(MediaPlayer::NetworkState::NetworkError);
} else {
// ↳ If the HTMLMediaElement.readyState attribute is greater than HAVE_NOTHING
// Run the "If the connection is interrupted after some media data has been received, causing the
// user agent to give up trying to fetch the resource" steps of the resource fetch algorithm.
// NOTE: This step is handled by HTMLMediaElement::mediaLoadingFailedFatally().
m_mediaElement->mediaLoadingFailedFatally(MediaPlayer::NetworkState::NetworkError);
}
} else {
// ↳ If error is set to "decode"
ASSERT(error == EndOfStreamError::Decode);
ASSERT(m_mediaElement);
if (m_mediaElement->readyState() == HTMLMediaElement::HAVE_NOTHING) {
// ↳ If the HTMLMediaElement.readyState attribute equals HAVE_NOTHING
// Run the "If the media data can be fetched but is found by inspection to be in an unsupported
// format, or can otherwise not be rendered at all" steps of the resource fetch algorithm.
// NOTE: This step is handled by HTMLMediaElement::mediaLoadingFailed().
m_mediaElement->mediaLoadingFailed(MediaPlayer::NetworkState::FormatError);
} else {
// ↳ If the HTMLMediaElement.readyState attribute is greater than HAVE_NOTHING
// Run the media data is corrupted steps of the resource fetch algorithm.
// NOTE: This step is handled by HTMLMediaElement::mediaLoadingFailedFatally().
m_mediaElement->mediaLoadingFailedFatally(MediaPlayer::NetworkState::DecodeError);
}
}
}
ExceptionOr<Ref<SourceBuffer>> MediaSource::addSourceBuffer(const String& type)
{
DEBUG_LOG(LOGIDENTIFIER, type);
// 2.2 http://www.w3.org/TR/media-source/#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type
// When this method is invoked, the user agent must run the following steps:
// 1. If type is an empty string then throw a TypeError exception and abort these steps.
if (type.isEmpty())
return Exception { TypeError };
// 2. If type contains a MIME type that is not supported ..., then throw a
// NotSupportedError exception and abort these steps.
if (!isTypeSupported(type))
return Exception { NotSupportedError };
// 4. If the readyState attribute is not in the "open" state then throw an
// InvalidStateError exception and abort these steps.
if (!isOpen())
return Exception { InvalidStateError };
// 5. Create a new SourceBuffer object and associated resources.
ContentType contentType(type);
auto sourceBufferPrivate = createSourceBufferPrivate(contentType);
if (sourceBufferPrivate.hasException()) {
// 2. If type contains a MIME type that is not supported ..., then throw a NotSupportedError exception and abort these steps.
// 3. If the user agent can't handle any more SourceBuffer objects then throw a QuotaExceededError exception and abort these steps
return sourceBufferPrivate.releaseException();
}
auto buffer = SourceBuffer::create(sourceBufferPrivate.releaseReturnValue(), this);
DEBUG_LOG(LOGIDENTIFIER, "created SourceBuffer");
// 6. Set the generate timestamps flag on the new object to the value in the "Generate Timestamps Flag"
// column of the byte stream format registry [MSE-REGISTRY] entry that is associated with type.
// NOTE: In the current byte stream format registry <http://www.w3.org/2013/12/byte-stream-format-registry/>
// only the "MPEG Audio Byte Stream Format" has the "Generate Timestamps Flag" value set.
bool shouldGenerateTimestamps = contentTypeShouldGenerateTimestamps(contentType);
buffer->setShouldGenerateTimestamps(shouldGenerateTimestamps);
// 7. If the generate timestamps flag equals true:
// ↳ Set the mode attribute on the new object to "sequence".
// Otherwise:
// ↳ Set the mode attribute on the new object to "segments".
buffer->setMode(shouldGenerateTimestamps ? SourceBuffer::AppendMode::Sequence : SourceBuffer::AppendMode::Segments);
// 8. Add the new object to sourceBuffers and fire a addsourcebuffer on that object.
m_sourceBuffers->add(buffer.copyRef());
regenerateActiveSourceBuffers();
// 9. Return the new object to the caller.
return buffer;
}
ExceptionOr<void> MediaSource::removeSourceBuffer(SourceBuffer& buffer)
{
DEBUG_LOG(LOGIDENTIFIER);
Ref<SourceBuffer> protect(buffer);
// 2. If sourceBuffer specifies an object that is not in sourceBuffers then
// throw a NotFoundError exception and abort these steps.
if (!m_sourceBuffers->length() || !m_sourceBuffers->contains(buffer))
return Exception { NotFoundError };
// 3. If the sourceBuffer.updating attribute equals true, then run the following steps: ...
buffer.abortIfUpdating();
ASSERT(scriptExecutionContext());
if (!scriptExecutionContext()->activeDOMObjectsAreStopped()) {
// 4. Let SourceBuffer audioTracks list equal the AudioTrackList object returned by sourceBuffer.audioTracks.
auto* audioTracks = buffer.audioTracksIfExists();
// 5. If the SourceBuffer audioTracks list is not empty, then run the following steps:
if (audioTracks && audioTracks->length()) {
// 5.1 Let HTMLMediaElement audioTracks list equal the AudioTrackList object returned by the audioTracks
// attribute on the HTMLMediaElement.
// 5.2 Let the removed enabled audio track flag equal false.
bool removedEnabledAudioTrack = false;
// 5.3 For each AudioTrack object in the SourceBuffer audioTracks list, run the following steps:
while (audioTracks->length()) {
auto& track = *audioTracks->lastItem();
// 5.3.1 Set the sourceBuffer attribute on the AudioTrack object to null.
track.setSourceBuffer(nullptr);
// 5.3.2 If the enabled attribute on the AudioTrack object is true, then set the removed enabled
// audio track flag to true.
if (track.enabled())
removedEnabledAudioTrack = true;
// 5.3.3 Remove the AudioTrack object from the HTMLMediaElement audioTracks list.
// 5.3.4 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the HTMLMediaElement audioTracks list.
if (mediaElement())
mediaElement()->removeAudioTrack(track);
// 5.3.5 Remove the AudioTrack object from the SourceBuffer audioTracks list.
// 5.3.6 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the SourceBuffer audioTracks list.
audioTracks->remove(track);
}
// 5.4 If the removed enabled audio track flag equals true, then queue a task to fire a simple event
// named change at the HTMLMediaElement audioTracks list.
if (removedEnabledAudioTrack)
mediaElement()->ensureAudioTracks().scheduleChangeEvent();
}
// 6. Let SourceBuffer videoTracks list equal the VideoTrackList object returned by sourceBuffer.videoTracks.
auto* videoTracks = buffer.videoTracksIfExists();
// 7. If the SourceBuffer videoTracks list is not empty, then run the following steps:
if (videoTracks && videoTracks->length()) {
// 7.1 Let HTMLMediaElement videoTracks list equal the VideoTrackList object returned by the videoTracks
// attribute on the HTMLMediaElement.
// 7.2 Let the removed selected video track flag equal false.
bool removedSelectedVideoTrack = false;
// 7.3 For each VideoTrack object in the SourceBuffer videoTracks list, run the following steps:
while (videoTracks->length()) {
auto& track = *videoTracks->lastItem();
// 7.3.1 Set the sourceBuffer attribute on the VideoTrack object to null.
track.setSourceBuffer(nullptr);
// 7.3.2 If the selected attribute on the VideoTrack object is true, then set the removed selected
// video track flag to true.
if (track.selected())
removedSelectedVideoTrack = true;
// 7.3.3 Remove the VideoTrack object from the HTMLMediaElement videoTracks list.
// 7.3.4 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the HTMLMediaElement videoTracks list.
if (mediaElement())
mediaElement()->removeVideoTrack(track);
// 7.3.5 Remove the VideoTrack object from the SourceBuffer videoTracks list.
// 7.3.6 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the SourceBuffer videoTracks list.
videoTracks->remove(track);
}
// 7.4 If the removed selected video track flag equals true, then queue a task to fire a simple event
// named change at the HTMLMediaElement videoTracks list.
if (removedSelectedVideoTrack)
mediaElement()->ensureVideoTracks().scheduleChangeEvent();
}
// 8. Let SourceBuffer textTracks list equal the TextTrackList object returned by sourceBuffer.textTracks.
auto* textTracks = buffer.textTracksIfExists();
// 9. If the SourceBuffer textTracks list is not empty, then run the following steps:
if (textTracks && textTracks->length()) {
// 9.1 Let HTMLMediaElement textTracks list equal the TextTrackList object returned by the textTracks
// attribute on the HTMLMediaElement.
// 9.2 Let the removed enabled text track flag equal false.
bool removedEnabledTextTrack = false;
// 9.3 For each TextTrack object in the SourceBuffer textTracks list, run the following steps:
while (textTracks->length()) {
auto& track = *textTracks->lastItem();
// 9.3.1 Set the sourceBuffer attribute on the TextTrack object to null.
track.setSourceBuffer(nullptr);
// 9.3.2 If the mode attribute on the TextTrack object is set to "showing" or "hidden", then
// set the removed enabled text track flag to true.
if (track.mode() == TextTrack::Mode::Showing || track.mode() == TextTrack::Mode::Hidden)
removedEnabledTextTrack = true;
// 9.3.3 Remove the TextTrack object from the HTMLMediaElement textTracks list.
// 9.3.4 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the HTMLMediaElement textTracks list.
if (mediaElement())
mediaElement()->removeTextTrack(track);
// 9.3.5 Remove the TextTrack object from the SourceBuffer textTracks list.
// 9.3.6 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the SourceBuffer textTracks list.
textTracks->remove(track);
}
// 9.4 If the removed enabled text track flag equals true, then queue a task to fire a simple event
// named change at the HTMLMediaElement textTracks list.
if (removedEnabledTextTrack)
mediaElement()->ensureTextTracks().scheduleChangeEvent();
}
}
// 10. If sourceBuffer is in activeSourceBuffers, then remove sourceBuffer from activeSourceBuffers ...
m_activeSourceBuffers->remove(buffer);
// 11. Remove sourceBuffer from sourceBuffers and fire a removesourcebuffer event
// on that object.
m_sourceBuffers->remove(buffer);
// 12. Destroy all resources for sourceBuffer.
buffer.removedFromMediaSource();
return { };
}
bool MediaSource::isTypeSupported(const String& type)
{
// Section 2.2 isTypeSupported() method steps.
// https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-MediaSource-isTypeSupported-boolean-DOMString-type
// 1. If type is an empty string, then return false.
if (type.isNull() || type.isEmpty())
return false;
ContentType contentType(type);
String codecs = contentType.parameter("codecs");
// 2. If type does not contain a valid MIME type string, then return false.
if (contentType.containerType().isEmpty())
return false;
// 3. If type contains a media type or media subtype that the MediaSource does not support, then return false.
// 4. If type contains at a codec that the MediaSource does not support, then return false.
// 5. If the MediaSource does not support the specified combination of media type, media subtype, and codecs then return false.
// 6. Return true.
MediaEngineSupportParameters parameters;
parameters.type = contentType;
parameters.isMediaSource = true;
MediaPlayer::SupportsType supported = MediaPlayer::supportsType(parameters);
if (codecs.isEmpty())
return supported != MediaPlayer::SupportsType::IsNotSupported;
return supported == MediaPlayer::SupportsType::IsSupported;
}
bool MediaSource::isOpen() const
{
return readyState() == ReadyState::Open;
}
bool MediaSource::isClosed() const
{
return readyState() == ReadyState::Closed;
}
bool MediaSource::isEnded() const
{
return readyState() == ReadyState::Ended;
}
void MediaSource::detachFromElement(HTMLMediaElement& element)
{
ALWAYS_LOG(LOGIDENTIFIER);
ASSERT_UNUSED(element, m_mediaElement == &element);
// 2.4.2 Detaching from a media element
// https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#mediasource-detach
// 1. Set the readyState attribute to "closed".
// 7. Queue a task to fire a simple event named sourceclose at the MediaSource.
setReadyState(ReadyState::Closed);
// 2. Update duration to NaN.
m_duration = MediaTime::invalidTime();
// 3. Remove all the SourceBuffer objects from activeSourceBuffers.
// 4. Queue a task to fire a simple event named removesourcebuffer at activeSourceBuffers.
while (m_activeSourceBuffers->length())
removeSourceBuffer(*m_activeSourceBuffers->item(0));
// 5. Remove all the SourceBuffer objects from sourceBuffers.
// 6. Queue a task to fire a simple event named removesourcebuffer at sourceBuffers.
while (m_sourceBuffers->length())
removeSourceBuffer(*m_sourceBuffers->item(0));
m_private = nullptr;
m_mediaElement = nullptr;
}
void MediaSource::sourceBufferDidChangeActiveState(SourceBuffer&, bool)
{
regenerateActiveSourceBuffers();
}
bool MediaSource::attachToElement(HTMLMediaElement& element)
{
if (m_mediaElement)
return false;
ASSERT(isClosed());
m_mediaElement = &element;
return true;
}
void MediaSource::openIfInEndedState()
{
if (m_readyState != ReadyState::Ended)
return;
ALWAYS_LOG(LOGIDENTIFIER);
setReadyState(ReadyState::Open);
m_private->unmarkEndOfStream();
}
bool MediaSource::hasPendingActivity() const
{
return m_private || m_asyncEventQueue->hasPendingEvents()
|| ActiveDOMObject::hasPendingActivity();
}
void MediaSource::stop()
{
ALWAYS_LOG(LOGIDENTIFIER);
if (m_mediaElement)
m_mediaElement->detachMediaSource();
m_readyState = ReadyState::Closed;
m_private = nullptr;
}
const char* MediaSource::activeDOMObjectName() const
{
return "MediaSource";
}
void MediaSource::onReadyStateChange(ReadyState oldState, ReadyState newState)
{
ALWAYS_LOG(LOGIDENTIFIER, "old state = ", oldState, ", new state = ", newState);
for (auto& buffer : *m_sourceBuffers)
buffer->readyStateChanged();
if (isOpen()) {
scheduleEvent(eventNames().sourceopenEvent);
return;
}
if (oldState == ReadyState::Open && newState == ReadyState::Ended) {
scheduleEvent(eventNames().sourceendedEvent);
return;
}
ASSERT(isClosed());
scheduleEvent(eventNames().sourcecloseEvent);
}
Vector<PlatformTimeRanges> MediaSource::activeRanges() const
{
Vector<PlatformTimeRanges> activeRanges;
for (auto& sourceBuffer : *m_activeSourceBuffers)
activeRanges.append(sourceBuffer->bufferedInternal().ranges());
return activeRanges;
}
ExceptionOr<Ref<SourceBufferPrivate>> MediaSource::createSourceBufferPrivate(const ContentType& type)
{
RefPtr<SourceBufferPrivate> sourceBufferPrivate;
switch (m_private->addSourceBuffer(type, sourceBufferPrivate)) {
case MediaSourcePrivate::Ok:
return sourceBufferPrivate.releaseNonNull();
case MediaSourcePrivate::NotSupported:
// 2.2 https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type
// Step 2: If type contains a MIME type ... that is not supported with the types
// specified for the other SourceBuffer objects in sourceBuffers, then throw
// a NotSupportedError exception and abort these steps.
return Exception { NotSupportedError };
case MediaSourcePrivate::ReachedIdLimit:
// 2.2 https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type
// Step 3: If the user agent can't handle any more SourceBuffer objects then throw
// a QuotaExceededError exception and abort these steps.
return Exception { QuotaExceededError };
}
ASSERT_NOT_REACHED();
return Exception { QuotaExceededError };
}
void MediaSource::scheduleEvent(const AtomString& eventName)
{
DEBUG_LOG(LOGIDENTIFIER, "scheduling '", eventName, "'");
auto event = Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::No);
event->setTarget(this);
m_asyncEventQueue->enqueueEvent(WTFMove(event));
}
ScriptExecutionContext* MediaSource::scriptExecutionContext() const
{
return ActiveDOMObject::scriptExecutionContext();
}
EventTargetInterface MediaSource::eventTargetInterface() const
{
return MediaSourceEventTargetInterfaceType;
}
URLRegistry& MediaSource::registry() const
{
return MediaSourceRegistry::registry();
}
void MediaSource::regenerateActiveSourceBuffers()
{
Vector<RefPtr<SourceBuffer>> newList;
for (auto& sourceBuffer : *m_sourceBuffers) {
if (sourceBuffer->active())
newList.append(sourceBuffer);
}
m_activeSourceBuffers->swap(newList);
for (auto& sourceBuffer : *m_activeSourceBuffers)
sourceBuffer->setBufferedDirty(true);
}
#if !RELEASE_LOG_DISABLED
void MediaSource::setLogIdentifier(const void* identifier)
{
m_logIdentifier = identifier;
ALWAYS_LOG(LOGIDENTIFIER);
}
WTFLogChannel& MediaSource::logChannel() const
{
return LogMediaSource;
}
#endif
}
#endif