feat: sync group call livestream support

internal/app/livestream/part_test.go

@@ -0,0 +1,103 @@
+package livestream
+
+import (
+	"encoding/binary"
+	"testing"
+)
+
+// readTLString 复刻 tgcalls readSerializedString，用于反解 packUnifiedPart 的头。
+func readTLString(data []byte, off *int) (string, bool) {
+	if *off >= len(data) {
+		return "", false
+	}
+	first := int(data[*off])
+	*off++
+	var length, padding int
+	if first == 254 {
+		if *off+3 > len(data) {
+			return "", false
+		}
+		length = int(data[*off]) | int(data[*off+1])<<8 | int(data[*off+2])<<16
+		*off += 3
+		padding = (4 - length%4) % 4
+	} else {
+		length = first
+		padding = (4 - (length+1)%4) % 4
+	}
+	if *off+length > len(data) {
+		return "", false
+	}
+	s := string(data[*off : *off+length])
+	*off += length + padding
+	return s, true
+}
+
+func readI32(data []byte, off *int) (int32, bool) {
+	if *off+4 > len(data) {
+		return 0, false
+	}
+	v := int32(binary.LittleEndian.Uint32(data[*off : *off+4]))
+	*off += 4
+	return v, true
+}
+
+// TestPackUnifiedPartMatchesTgcallsHeader 校验打包头逐字段可被 tgcalls
+// consumeVideoStreamInfo 解出：签名、容器名、activeMask、单 event(endpoint="unified")，
+// 且 event.offset=0 对应紧随其后的 TS 数据。
+func TestPackUnifiedPartMatchesTgcallsHeader(t *testing.T) {
+	ts := []byte{0x47, 0x40, 0x00, 0x10, 0xDE, 0xAD, 0xBE, 0xEF} // 伪 TS 数据
+	part := packUnifiedPart(ts)
+
+	off := 0
+	sig, ok := readI32(part, &off)
+	if !ok || uint32(sig) != partSignature {
+		t.Fatalf("signature = %#x ok=%v, want %#x", uint32(sig), ok, partSignature)
+	}
+	container, ok := readTLString(part, &off)
+	if !ok || container != partContainer {
+		t.Fatalf("container = %q ok=%v, want %q", container, ok, partContainer)
+	}
+	activeMask, ok := readI32(part, &off)
+	if !ok || activeMask != 1 {
+		t.Fatalf("activeMask = %d ok=%v, want 1", activeMask, ok)
+	}
+	eventCount, ok := readI32(part, &off)
+	if !ok || eventCount != 1 {
+		t.Fatalf("eventCount = %d ok=%v, want 1", eventCount, ok)
+	}
+	eventOffset, ok := readI32(part, &off)
+	if !ok || eventOffset != 0 {
+		t.Fatalf("event.offset = %d ok=%v, want 0", eventOffset, ok)
+	}
+	endpoint, ok := readTLString(part, &off)
+	if !ok || endpoint != partEndpointID {
+		t.Fatalf("endpoint = %q ok=%v, want %q", endpoint, ok, partEndpointID)
+	}
+	rotation, _ := readI32(part, &off)
+	extra, _ := readI32(part, &off)
+	if rotation != 0 || extra != 0 {
+		t.Fatalf("rotation/extra = %d/%d, want 0/0", rotation, extra)
+	}
+	// 头之后（event.offset=0 起）应为原始 TS 数据。
+	if got := part[off:]; string(got) != string(ts) {
+		t.Fatalf("payload = %x, want %x", got, ts)
+	}
+}
+
+// TestAppendTLStringPadding 校验短/长字符串都补齐到 4 字节边界。
+func TestAppendTLStringPadding(t *testing.T) {
+	for _, s := range []string{"", "a", "ab", "abc", "mpegts", "unified"} {
+		out := appendTLString(nil, s)
+		if len(out)%4 != 0 {
+			t.Fatalf("appendTLString(%q) len=%d not 4-aligned", s, len(out))
+		}
+		off := 0
+		got, ok := readTLString(out, &off)
+		if !ok || got != s {
+			t.Fatalf("roundtrip %q -> %q ok=%v", s, got, ok)
+		}
+		if off != len(out) {
+			t.Fatalf("roundtrip %q consumed %d of %d bytes", s, off, len(out))
+		}
+	}
+}