public async Task <IDrmSession> GetDrmSession(DrmInitData data)
{
var keyIds = DrmInitDataTools.GetKeyIds(data);
var useGenericKey = keyIds.Count == 0;
if (useGenericKey)
{
Logger.Info("No keys found in initData - using entire DrmInitData with InitData as a generic key.");
keyIds.Add(data.InitData);
}
Logger.Info("Keys found - getting DrmSession.");
IDrmSession session;
using (await clipDrmConfigurationsLock.LockAsync())
session = await GetCdmInstance(data).GetDrmSession(data, keyIds, clipDrmConfigurations);
return(session);
}
public IDrmSession CreateDRMSession(DRMInitData data)
{
Logger.Info("Create DrmSession");
// Before diving into locks, decode DRM InitData KeyIDs
var keyIds = DrmInitDataTools.GetKeyIds(data);
var useGenericKey = keyIds.Count == 0;
if (useGenericKey)
{
Logger.Info("No keys found. Using entire DRMInitData.InitData as generic key");
keyIds.Add(data.InitData);
}
else
{
// Early exit scenario - already cached
if (_sessionCache.TryGetSession(keyIds, out IDrmSession session))
{
Logger.Info("Cached session found");
return(session);
}
}
lock (drmHandlers)
{
var handler = drmHandlers.FirstOrDefault(o => o.SupportsSystemId(data.SystemId));
if (handler == null)
{
Logger.Warn("unknown drm init data");
return(null);
}
var scheme = handler.GetScheme(data.SystemId);
lock (clipDrmConfiguration)
{
var drmConfiguration = clipDrmConfiguration.FirstOrDefault(o => SchemeEquals(o.Scheme, scheme));
if (drmConfiguration == null)
{
Logger.Warn("drm not configured");
return(null);
}
// Recheck needs to be done for cached session.
// Early check may produce false negatives - session being created by other stream
// but not yet cached.
if (_sessionCache.TryGetSession(keyIds, out IDrmSession session))
{
Logger.Info("Cached session found");
return(session);
}
Logger.Info("No cached session found");
session = handler.CreateDRMSession(data, drmConfiguration);
session.Share();
if (_sessionCache.TryAddSession(keyIds, session))
{
return(session);
}
Logger.Info("Failed to cache session");
session.Release();
return(session);
}
}
}
public override string ToString()
{
return(_cache.Keys.Aggregate("Cached Sessions: " + _cache.Keys.Count,
(current, key) => current + "\n" + DrmInitDataTools.KeyToUuid(key)));
}