By Xabier Rodríguez Calvar. (c) GStreamer Conference 2018 CC-BY-SA 3.0 https://gstreamer.freedesktop.org/conference/2018/ https://gstconf.ubicast.tv/videos/lightning-talks_54780/

1. static void
_f_do_barnacle_install_properties(GObjectClass
*gobject_class)
{
GParamSpec *pspec;
/* Party code attribute */
pspec = g_param_spec_uint64
(F_DO_BARNACLE_CODE,
"Barnacle code.",
"Barnacle code",
0,
G_MAXUINT64,
G_MAXUINT64 /*
default value */,
G_PARAM_READABLE
| G_PARAM_WRITABLE |
G_PARAM_PRIVATE);
g_object_class_install_property (gobject_class,
F_DO_BARNACLE_PROP_CODE,
Xabier Rodríguez Calvar
calvaris@igalia.com
GStreamer conference
Edinburgh
25th-26th October 2018
EME in WebKit with
GStreamer
Quick status and challenges

2. Who am I?
●
Fiddling with WebKit and GStreamer
●
WebKit committer and reviewer
●
GStreamer contributor
●
Partner at Igalia
●
Worker-owned coop, currently around 70 happy Igalians
around the world
●
Provides consulting services for various Free Software
projects

3. Encrypted Media Extensions
●
W3C standard that brings DRM to the web
●
ClearKey
●
Implemented and in WPEWebKit downstream
●
PlayReady
●
Widevine
●
Upstreaming is not trivial legally
●
Works with Media Source Extensions and regular playback

4. Demuxers
●
GStreamer demuxers need to be aware of encryption
●
qtdemux quite stable for MP4
●
matroskademux just landed for WebM
●
Send protection events with initialization data
●
Configure encrypted caps
●
A key system is selected according to the available
decryptors
●
playbin does the rest

5. Decryptor selection (1)

6. Decryptor selection (and 2)
●
Demuxers need to let the app select the encryption system
●
qtdemux runs a query for preferred key system
●
matroskademux does nothing?
●
Should be answered synchronously
●
Single decryptor for all systems
●
Works
●
Wrong caps
●
Room for improvement
●
Depends on the demuxer
●
No common API for this

7. Protection GstEvent
●
system_id is non-nullable
●
WebM does not report key systems
●
API cannot be changed
●
define for undefined systems

8. Future
●
Upstream, upstream, upstream
●
Improve decryptors arch to handle
decoder/decryptor/sink elements
●
Base class?