progres on sabr context update

yt_dlp_plugins/extractor/_ytse/protos/_sabr_context_update.py

@@ -11,7 +11,22 @@ class ContextUpdate:
 
 @protobug.message
 class SabrContextUpdate:
-    unknown_field_1: typing.Optional[protobug.Int32] = protobug.field(1, default=None)  # seen = 2
-    unknown_field_2: typing.Optional[protobug.Int32] = protobug.field(2, default=None)  # seen = 2
-    context_update: typing.Optional[ContextUpdate] = protobug.field(3, default_factory=ContextUpdate)
-    unknown_field_4: typing.Optional[protobug.Int32] = protobug.field(4, default=None)  # seen = 1
+
+    class SabrContextScope(protobug.Enum):
+        SABR_CONTEXT_SCOPE_UNKNOWN = 0
+        SABR_CONTEXT_SCOPE_PLAYBACK = 1
+        SABR_CONTEXT_SCOPE_REQUEST = 2
+        SABR_CONTEXT_SCOPE_WATCH_ENDPOINT = 3
+        SABR_CONTEXT_SCOPE_CONTENT_ADS = 4
+
+    class SabrContextWritePolicy(protobug.Enum):
+        # Whether to override existing sabr context updates?
+        SABR_CONTEXT_WRITE_POLICY_UNSPECIFIED = 0
+        SABR_CONTEXT_WRITE_POLICY_OVERWRITE = 1
+        SABR_CONTEXT_WRITE_POLICY_KEEP_EXISTING = 2
+
+    type: typing.Optional[protobug.Int32] = protobug.field(1, default=None)  # seen = 2
+    scope: typing.Optional[SabrContextScope] = protobug.field(2, default=None) # seen = 2 (SABR_CONTEXT_SCOPE_REQUEST?)
+    value: typing.Optional[protobug.Bytes] = protobug.field(3, default=None)  # todo: value changes based on type?
+    send_by_default: typing.Optional[protobug.Bool] = protobug.field(4, default=None)  # seen = True
+    write_policy: typing.Optional[SabrContextWritePolicy] = protobug.field(5, default=None)

yt_dlp_plugins/extractor/_ytse/protos/_streamer_context.py

@@ -43,8 +43,9 @@ class ClientInfo:
     unknown_field_98: typing.Optional[protobug.String] = protobug.field(98, default=None)  # seen on android = "google"
     gl_device_info: typing.Optional[GLDeviceInfo] = protobug.field(102, default=None)
 
+
 @protobug.message
-class Fqa:
+class SentSabrContextUpdate:
     type: typing.Optional[protobug.Int32] = protobug.field(1, default=None)
     value: typing.Optional[protobug.Bytes] = protobug.field(2, default=None)
 
@@ -67,7 +68,10 @@ class StreamerContext:
     po_token: typing.Optional[protobug.Bytes] = protobug.field(2, default=None)
     playback_cookie: typing.Optional[protobug.Bytes] = protobug.field(3, default=None)
     gp: typing.Optional[protobug.Bytes] = protobug.field(4, default=None)
-    field5: list[Fqa] = protobug.field(5, default_factory=list)
-    field6: list[protobug.Int32] = protobug.field(6, default_factory=list)
+    # referred to as "stmctxt". Seems to be the SABR context updates (ad updates) that were applied (sendByDefault was True)
+    # Also applied for sabr context updates contained within TIMELINE_CONTEXT
+    sent_sabr_context_updates: list[SentSabrContextUpdate] = protobug.field(5, default_factory=list)
+    # referred to as "unsntctxt". Is the type in the SABR Context update that was not sent (sendByDefault was False)
+    unsent_sabr_context_update_types: list[protobug.Int32] = protobug.field(6, default_factory=list)
     field7: typing.Optional[protobug.String] = protobug.field(7, default=None)
     field8: typing.Optional[Gqa] = protobug.field(8, default=None)

yt_dlp_plugins/extractor/_ytse/protos/_timeline_context.py

@@ -0,0 +1,37 @@
+import typing
+import protobug
+from . import SabrContextUpdate
+
+
+@protobug.message
+class rkH:
+    S8: typing.Optional[protobug.String] = protobug.field(1, default=None)
+    Xn: typing.Optional[protobug.Int32] = protobug.field(2, default=None)
+    ZJ2: typing.Optional[protobug.Int32] = protobug.field(3, default=None)
+    sj: typing.Optional[protobug.Int32] = protobug.field(4, default=None)
+    GU: typing.Optional[protobug.Int32] = protobug.field(5, default=None)
+    wE: typing.Optional[protobug.Int32] = protobug.field(6, default=None)
+
+
+@protobug.message
+class i8V:
+    L4: typing.Optional[protobug.Int32] = protobug.field(1, default=None)
+
+
+@protobug.message
+class Clip:
+    clip_id: typing.Optional[protobug.String] = protobug.field(1, default=None)
+    T7: typing.Optional[rkH] = protobug.field(2, default=None)
+    h2: typing.Optional[i8V] = protobug.field(3, default=None)
+
+
+@protobug.message
+class Timeline:
+    clip: typing.Optional[Clip] = protobug.field(1, default=None)
+    j2E: typing.Optional[protobug.String] = protobug.field(2, default=None)
+
+
+@protobug.message
+class TimelineContext:
+    timeline: typing.Optional[Timeline] = protobug.field(1, default=None)  # may be a list, todo: confirm
+    sabr_context_update: typing.Optional[SabrContextUpdate] = protobug.field(2, default=None)