chore: refresh gramsrv public release

internal/sfu/mediaplan_test.go

@@ -0,0 +1,51 @@
+package sfu
+
+import "testing"
+
+// 选层契约：订阅端只为 SIM[0]（最低层）与其 FID RTX 伙伴建解码 sink，
+// SFU 只转发这两个视频 ssrc，其余层在 SFU 终结。
+func TestBuildMediaPlanSimulcast(t *testing.T) {
+	offer := ClientOffer{
+		AudioSSRC: 1000,
+		SsrcGroups: []SsrcGroup{
+			{Semantics: "SIM", Sources: []uint32{1001, 1003, 1005}},
+			{Semantics: "FID", Sources: []uint32{1001, 1002}},
+			{Semantics: "FID", Sources: []uint32{1003, 1004}},
+			{Semantics: "FID", Sources: []uint32{1005, 1006}},
+		},
+	}
+	plan := buildMediaPlan(offer)
+	for _, ssrc := range []uint32{1000, 1001, 1002} {
+		if !plan.shouldForward(ssrc) {
+			t.Fatalf("ssrc %d must be forwarded (audio / SIM[0] / its RTX)", ssrc)
+		}
+	}
+	for _, ssrc := range []uint32{1003, 1004, 1005, 1006} {
+		if plan.shouldForward(ssrc) {
+			t.Fatalf("ssrc %d must be dropped (higher simulcast layer)", ssrc)
+		}
+	}
+	// 未声明 ssrc（探测/未来扩展）放行，订阅端安全丢弃。
+	if !plan.shouldForward(9999) {
+		t.Fatalf("undeclared ssrc must pass through")
+	}
+}
+
+// 单层发布（conference 模式）：无 SIM 组、唯一 FID 组的第一个 ssrc 即主流。
+func TestBuildMediaPlanSingleLayer(t *testing.T) {
+	plan := buildMediaPlan(ClientOffer{
+		AudioSSRC:  2000,
+		SsrcGroups: []SsrcGroup{{Semantics: "FID", Sources: []uint32{2001, 2002}}},
+	})
+	if !plan.shouldForward(2001) || !plan.shouldForward(2002) {
+		t.Fatalf("single-layer media+rtx must be forwarded")
+	}
+}
+
+// 纯音频（无视频组）：一切放行。
+func TestBuildMediaPlanAudioOnly(t *testing.T) {
+	plan := buildMediaPlan(ClientOffer{AudioSSRC: 3000})
+	if !plan.shouldForward(3000) || !plan.shouldForward(3001) {
+		t.Fatalf("audio-only plan must forward everything")
+	}
+}