import cv2
import numpy as np

# 摄像头
cap = cv2.VideoCapture(0)
if not cap.isOpened():
    print("无法打开摄像头")
    exit()

# 目标输出分辨率（匹配你的小屏+转换器）
OUT_WIDTH = 720
OUT_HEIGHT = 480

# 创建窗口并设为可调整
cv2.namedWindow("HDMI_Output", cv2.WINDOW_NORMAL)

# 关键：把窗口移到第二块屏幕（HDMI）的位置
# 假设主屏幕是 1920 宽，第二块屏幕从 x=1920 开始
# 请根据你实际的主屏幕宽度修改这个值！
SECOND_SCREEN_X = 1920   # ← 改成你主屏幕的宽度
SECOND_SCREEN_Y = 0

cv2.moveWindow("HDMI_Output", SECOND_SCREEN_X, SECOND_SCREEN_Y)
cv2.setWindowProperty("HDMI_Output", cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN)

while True:
    ret, frame = cap.read()
    if not ret:
        break

    # 缩放到目标分辨率
    frame = cv2.resize(frame, (OUT_WIDTH, OUT_HEIGHT))

    # 显示
    cv2.imshow("HDMI_Output", frame)

    # 按 q 退出
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()