Calculating a principal when adding a track is easy - just combine the new
track principal into the stream's principal.
When removing a track it's a bit trickier. The DOMMediaStream has to wait until
the MediaStreamGraph has removed the track from the underlying playback stream.
We do this by letting the MediaStreamGraph return a Pledge (single threaded
Promise) when blocking a track in a stream (the way we end removed tracks).
The pledge gets passed to the MediaStreamGraph and when the block has been
applied it is passed back to the main thread where it is finally resolved
and the DOMMediaStream may recompute its principal once all outstanding
track removals have been applied.
MozReview-Commit-ID: 3QP0YcDyfGf
--HG--
extra : rebase_source : 6642849ec1c7d774467395dee82b0a37fdd33a99
This lets us know the track's TrackID in the destination stream before
the input port has been processed.
For sanity we only allow mapping to a destination TrackID if the
destination stream does not have any TRACK_ANY input ports already
assigned to it as that can cause intermittent TrackID collisions.
MozReview-Commit-ID: ClFyQl0nYFC
--HG--
extra : rebase_source : 25fa0f34cb4fa9293a572bff03fe005c33be0195
Sometimes we'll need an initial suspended count of 2, which is not supported
by this API, but this is not necessary anyway.
--HG--
extra : rebase_source : 56ecca7c14025ea7e18ba9a20e0b7725a610b429
The bulk of this commit was generated with a script, executed at the top
level of a typical source code checkout. The only non-machine-generated
part was modifying MFBT's moz.build to reflect the new naming.
CLOSED TREE makes big refactorings like this a piece of cake.
# The main substitution.
find . -name '*.cpp' -o -name '*.cc' -o -name '*.h' -o -name '*.mm' -o -name '*.idl'| \
xargs perl -p -i -e '
s/nsRefPtr\.h/RefPtr\.h/g; # handle includes
s/nsRefPtr ?</RefPtr</g; # handle declarations and variables
'
# Handle a special friend declaration in gfx/layers/AtomicRefCountedWithFinalize.h.
perl -p -i -e 's/::nsRefPtr;/::RefPtr;/' gfx/layers/AtomicRefCountedWithFinalize.h
# Handle nsRefPtr.h itself, a couple places that define constructors
# from nsRefPtr, and code generators specially. We do this here, rather
# than indiscriminantly s/nsRefPtr/RefPtr/, because that would rename
# things like nsRefPtrHashtable.
perl -p -i -e 's/nsRefPtr/RefPtr/g' \
mfbt/nsRefPtr.h \
xpcom/glue/nsCOMPtr.h \
xpcom/base/OwningNonNull.h \
ipc/ipdl/ipdl/lower.py \
ipc/ipdl/ipdl/builtin.py \
dom/bindings/Codegen.py \
python/lldbutils/lldbutils/utils.py
# In our indiscriminate substitution above, we renamed
# nsRefPtrGetterAddRefs, the class behind getter_AddRefs. Fix that up.
find . -name '*.cpp' -o -name '*.h' -o -name '*.idl' | \
xargs perl -p -i -e 's/nsRefPtrGetterAddRefs/RefPtrGetterAddRefs/g'
if [ -d .git ]; then
git mv mfbt/nsRefPtr.h mfbt/RefPtr.h
else
hg mv mfbt/nsRefPtr.h mfbt/RefPtr.h
fi
--HG--
rename : mfbt/nsRefPtr.h => mfbt/RefPtr.h
TrackUnionStream guarantees that TrackIDs are maintained if no tracks
have claimed them before.
In the gUM case, we have a SourceMediaStream which we wholly own (the
DOMMediaStream's Input stream), piped into a TrackUnionStream which
no-one external is able to add tracks to (the DOMMediaStream's Owned
stream) - addTrack()ed tracks are added to the DOMMediaStream's Playback
stream.
The MediaStreamTracks being enabled/disable refer to a TrackID in the
DOMMediaStream's Owned stream.
Alas, we don't need to forward a track's enabled state, we can just do
it on the source.
--HG--
extra : commitid : GPSNwBVyD4j
extra : rebase_source : 4388211be87ebe8a3839ea031b5c504d642806ab
This lets us separate tracks by ownership like so:
* Input - Owned by the producer of the DOMMediaStream (gUM etc.)
* Owned - Contains Input tracks (per above) or tracks cloned tracks
if this DOMMediaStream is a clone.
* Playback - Contains Owned tracks plus tracks addTrack()ed to this
DOMMediaStream minus tracks removeTrack()ed from this
DOMMediaStream.
--HG--
extra : commitid : GPSNwBVyD4j
extra : rebase_source : fba22e96c6c65a74e012509f3da67a4d7df7a244
Locking to specific tracks lets us dynamically remove and add single
tracks to a ProcessedMediaStream.
--HG--
extra : commitid : GPSNwBVyD4j
extra : rebase_source : 0b1b79077f95bbefc8c71de551c5e3483a7d6ac0
This allows for tracking the input track of an added track (for
ProcessedMediaStream tracks; SourceMediaStream tracks don't have input
tracks) directly in the NotifyQueuedTrackChanges handler, which will be
necessary for locking MediaInputPorts to specific tracks.
--HG--
extra : commitid : GPSNwBVyD4j
extra : rebase_source : 4bed5dffe66b71b7ad23f4c02531d84af25cd316
TrackUnionStream guarantees that TrackIDs are maintained if no tracks
have claimed them before.
In the gUM case, we have a SourceMediaStream which we wholly own (the
DOMMediaStream's Input stream), piped into a TrackUnionStream which
no-one external is able to add tracks to (the DOMMediaStream's Owned
stream) - addTrack()ed tracks are added to the DOMMediaStream's Playback
stream.
The MediaStreamTracks being enabled/disable refer to a TrackID in the
DOMMediaStream's Owned stream.
Alas, we don't need to forward a track's enabled state, we can just do
it on the source.
--HG--
extra : commitid : Kvj9RrN9MgP
This lets us separate tracks by ownership like so:
* Input - Owned by the producer of the DOMMediaStream (gUM etc.)
* Owned - Contains Input tracks (per above) or tracks cloned tracks
if this DOMMediaStream is a clone.
* Playback - Contains Owned tracks plus tracks addTrack()ed to this
DOMMediaStream minus tracks removeTrack()ed from this
DOMMediaStream.
--HG--
extra : commitid : Kvj9RrN9MgP
This allows for tracking the input track of an added track (for
ProcessedMediaStream tracks; SourceMediaStream tracks don't have input
tracks) directly in the NotifyQueuedTrackChanges handler, which will be
necessary for locking MediaInputPorts to specific tracks.
--HG--
extra : commitid : Kvj9RrN9MgP
Andreas Pehrson
Randell Jesup
Wes Kocher
Jean-Yves Avenard
Andrea Marchesini
Carsten "Tomcat" Book
sajitk
Karl Tomlinson
Nathan Froyd
Robert O'Callahan