tree 09f4ac8dd64a0bb741cf2c57bdcb091d8ce6914b
parent 68af9eb4847afe6fa034ef8468a4fa2ee76c05b3
author commit-queue@webkit.org <commit-queue@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1524814433 +0000
committer commit-queue@webkit.org <commit-queue@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1524814433 +0000

[EME][GStreamer] Move the decryptor from AppendPipeline to PlaybackPipeline.
https://bugs.webkit.org/show_bug.cgi?id=181855

Patch by Yacine Bandou <yacine.bandou_ext@softathome.com> on 2018-04-27
Reviewed by Xabier Rodriguez-Calvar.

The goal of this move is to handle the limitation of SVP (Secure Video Path) memory size.

When the decryptor is in the AppendPipeline and we use SVP, we buffer in MediaSource queue
the decrypted GstBuffers that are in SVP memory.
This behavior cause an out-of-memory error, because we are limited in SVP memory size.

By moving the decryptor in PlaybackPipeline, we avoid to buffer the decrypted GstBuffers
which use the SVP memory and we buffer the encrypted GstBuffers that are in system memory.

This new architecture also allows to start the buffering before obtaining the DRM license
and it makes easier to manage dynamic change of the license or Key.

The decryptor is auto plugged by GStreamer playbin in PlaybackPipeline.

SVP: Secure Video Path also named trusted or protected video path, it is a memory which is
protected by a hardware access control engine, it is not accessible to other unauthorised
software or hardware components.

Tests:
    media/encrypted-media/clearKey/clearKey-cenc-audio-playback-mse.html
    media/encrypted-media/clearKey/clearKey-cenc-video-playback-mse.html

* platform/graphics/gstreamer/eme/WebKitCommonEncryptionDecryptorGStreamer.cpp:
(webkitMediaCommonEncryptionDecryptSinkEventHandler):
* platform/graphics/gstreamer/mse/AppendPipeline.cpp:
(WebCore::dumpAppendState):
(WebCore::AppendPipeline::AppendPipeline):
(WebCore::AppendPipeline::handleNeedContextSyncMessage):
(WebCore::AppendPipeline::handleAppsrcNeedDataReceived):
(WebCore::AppendPipeline::setAppendState):
(WebCore::AppendPipeline::parseDemuxerSrcPadCaps):
(WebCore::AppendPipeline::appsinkNewSample):
(WebCore::AppendPipeline::connectDemuxerSrcPadToAppsinkFromAnyThread):
(WebCore::AppendPipeline::disconnectDemuxerSrcPadFromAppsinkFromAnyThread):
(WebCore::appendPipelineElementMessageCallback): Deleted.
(WebCore::AppendPipeline::handleElementMessage): Deleted.
(WebCore::AppendPipeline::dispatchPendingDecryptionStructure): Deleted.
(WebCore::AppendPipeline::dispatchDecryptionStructure): Deleted.
* platform/graphics/gstreamer/mse/AppendPipeline.h:
* platform/graphics/gstreamer/mse/MediaPlayerPrivateGStreamerMSE.cpp:
(WebCore::MediaPlayerPrivateGStreamerMSE::attemptToDecryptWithInstance):
* platform/graphics/gstreamer/mse/PlaybackPipeline.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@231089 268f45cc-cd09-0410-ab3c-d52691b4dbfc