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{"id":10044,"date":"2022-06-21T09:10:43","date_gmt":"2022-06-21T09:10:43","guid":{"rendered":"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/documentation\/rdk_video_documentation\/components\/open-sourced_components\/advanced_adaptive_media_player_aamp\/aamp_dash_architecture_overview\/"},"modified":"2025-03-25T05:18:34","modified_gmt":"2025-03-25T05:18:34","slug":"aamp_dash_architecture_overview","status":"publish","type":"page","link":"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/rdk_video_documentation\/components\/advanced_adaptive_media_player_aamp\/aamp_dash_architecture_overview\/","title":{"rendered":"AAMP DASH Architecture Overview"},"content":{"rendered":"

\n <\/p>\n

DASH DRM Flow (analogous to MSE\/EME)<\/h3>\n
1. PrivateStreamAbstractionMPD::ProcessContentProtection<\/strong><\/p>\n
\n
Checks if PSSH is available in manifest and, initiates DRM session creation, if PSSH is available.<\/li>\n
This will be the starting point for DRM session creation, if PSSH is available in manifest.<\/li>\n
Also Queue Protection Event using the extracted PSSH, for the cases where PSSH is missing in stream.<\/li>\n
This protection event is published to gstreamer layer from AMPGstPlayer_SendPendingEvents\n
\n
1.A)<\/strong> <\/span>If yes extracts the PSSH and metadata for available DRM systems<\/span><\/li>\n
1.B) <\/strong>If multiple DRMs are present selects the preferred one<\/span><\/li>\n
1.C) <\/strong>If lastProcessedKeyID != newKeyID<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
Spawns thread to create DRM session for that keyID<\/p>\n
<\/p>\n
2. AampDRMSessionManager::createDrmSession<\/strong><\/p>\n
\n
CreateDrmSession, creates and\/or returns the decrypt context by calling DRM API’s through OpenCDMSession<\/li>\n
We have two slots for DRM sessions, if the new request matches none of the already processed keyIDs, clears the oldest one.\n
\n
2.A)<\/strong> <\/span>Returns drm context to decrypt if a session is present with requested keyID<\/li>\n
2.B)<\/strong> <\/span>Else, creates new drm session and stores the keyID to keyID cache.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
   AampDrmSessionFactory::GetDrmSession(systemId);<\/strong><\/p>\n
\n
Initializes and returns appropriate DrmSession ie, PlayReady or WideWine<\/li>\n
drm session state will be KEY_INIT on success<\/li>\n<\/ul>\n
   <\/span>drmSession->generateAampDRMSession(initDataPtr, dataLength);<\/strong><\/p>\n
\n
Binds the initdata with the initialized drm session<\/li>\n
drm session state will be KEY_INIT on success<\/li>\n<\/ul>\n
    drmSession->aampGenerateKeyRequest(destinationURL);<\/strong><\/p>\n
\n
Generates license request from the drm session<\/li>\n
drm session state will be KEY_PENDING on success<\/li>\n<\/ul>\n
     <\/p>\n
    <\/span>SecClient_AcquireLicense(….);     OR AampDRMSessionManager’s getLicense()<\/strong><\/p>\n
\n
Gets the license key by posting a proper request to license server, created<\/li>\n
using KeyRequest, destinationURL, accessToken etc.<\/li>\n<\/ul>\n
       <\/p>\n
    <\/span>drmSession->aampDRMProcessKey(key);<\/strong><\/p>\n
\n
Key returned from AcquireLicense is fed to drm.<\/li>\n
drm session state will be KEY_READY on success<\/li>\n<\/ul>\n
<\/p>\n
3. Handling GST_EVENT_PROTECTION in gst_aampcdmidecryptor_sink_event<\/strong><\/p>\n
\n
In normal cases, where PSSH is present in both manifest and stream AAMP will initiate to create drm session from step 1 itself and drm session will be almost ready, when qtdemux publishes the GST_EVENT_PROTECTION <\/li>\n
In cases where PSSH is not in stream this will be the starting point of DRM session creation\n
\n
3.A)<\/strong> <\/span>Parse the initdata in PROTECTION_EVENT and request drm session.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
4. qtdemux and playready\/widevine plugins.<\/strong><\/p>\n
\n
AAMP playready\/widevine plugins are initialized with GST_RANK_PRIMARY<\/li>\n
This rank is changed to GST_RANK_PRIMARY + 111, on first AAMP tune.<\/li>\n
This is to make sure AAMP plugins are not interfering with WPE plugins<\/li>\n<\/ul>\n
    4.A) qtdemux detects stream encryption<\/p>\n
    4.B) qtdemux sends need context message for preferred-drm<\/p>\n
    4.C) bus_sync_handler in AAMPGstPlayer responds with preferred-drm<\/p>\n
    4.D) qtdemux sends protection event for preferred-drm<\/p>\n
    4.E) playready\/widevine plugins receives the protection event, only the preferred plugin process it and other one discards it.<\/p>\n
    4.F) gst_aampcdmidecryptor_transform_ip is invoked, where buffer is decrypted<\/p>\n
Below is the diagram showing MSE-EME’s stack overview, we follow almost same flow in AAMP.<\/p>\n
https:\/\/www.w3.org\/TR\/encrypted-media\/stack_overview.svg<\/a><\/p>\n
https:\/\/w3c.github.io\/encrypted-media\/format-registry\/stream\/mp4.html<\/a><\/p>\n
https:\/\/w3c.github.io\/encrypted-media\/format-registry\/initdata\/cenc.html<\/a><\/p>\n
<\/body><\/html><\/p>\n","protected":false},"excerpt":{"rendered":"
DASH DRM Flow (analogous to MSE\/EME) 1. PrivateStreamAbstractionMPD::ProcessContentProtection Checks if PSSH is available in manifest […]<\/p>\n","protected":false},"author":28,"featured_media":0,"parent":10015,"menu_order":8,"comment_status":"open","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"class_list":["post-10044","page","type-page","status-publish","hentry"],"yoast_head":"\nAAMP DASH Architecture Overview - RDK Documentation Portal | Documentation<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/rdk_video_documentation\/components\/advanced_adaptive_media_player_aamp\/aamp_dash_architecture_overview\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AAMP DASH Architecture Overview - RDK Documentation Portal | Documentation\" \/>\n<meta property=\"og:description\" content=\"DASH DRM Flow (analogous to MSE\/EME) 1. 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