File size: 4,487 Bytes
387c3d6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | # 文件名: py代码/realtime_video_widget.py
# (已修复: 修正了 __init__ 中 black_pixmap 的初始化顺序)
from PyQt6.QtWidgets import (QWidget, QVBoxLayout, QHBoxLayout,
QPushButton, QGroupBox, QLabel)
from PyQt6.QtCore import pyqtSignal, pyqtSlot, Qt
from PyQt6.QtGui import QImage, QPixmap
class RealtimeVideoWidget(QWidget):
"""
实时视频传输的UI (选项卡)
"""
# 信号:
start_tx_streaming = pyqtSignal()
stop_tx_streaming = pyqtSignal()
def __init__(self, parent=None):
super().__init__(parent)
self.is_enabled = False
# --- [!! 关键修复 !!] ---
# 必须在 init_ui() 之前 创建 black_pixmap, 因为 init_ui() 会使用它
self.black_pixmap = self._create_black_pixmap()
self.init_ui()
# --- [!! 修复结束 !!] ---
def _create_black_pixmap(self, w=640, h=480):
"""创建一个黑色的 QPixmap 作为占位符"""
pixmap = QPixmap(w, h)
pixmap.fill(Qt.GlobalColor.black)
return pixmap
def init_ui(self):
main_layout = QHBoxLayout(self)
# --- 发射 (TX) ---
tx_group = QGroupBox("实时发射 (摄像头)")
tx_layout = QVBoxLayout(tx_group)
self.btn_start_tx = QPushButton("开始实时发射")
self.btn_start_tx.setCheckable(True)
self.btn_start_tx.toggled.connect(self.on_tx_toggled)
self.local_video_label = QLabel("等待本地摄像头...")
self.local_video_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
self.local_video_label.setScaledContents(True)
self.local_video_label.setStyleSheet("background-color: black; color: white;")
self.local_video_label.setMinimumSize(320, 240)
self.local_video_label.setPixmap(self.black_pixmap) # <--- Bug 发生在这里
tx_layout.addWidget(self.btn_start_tx)
tx_layout.addWidget(self.local_video_label, 1) # 允许缩放
# --- 接收 (RX) ---
rx_group = QGroupBox("实时接收 (网络)")
rx_layout = QVBoxLayout(rx_group)
self.remote_video_label = QLabel("等待网络视频流...")
self.remote_video_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
self.remote_video_label.setScaledContents(True)
self.remote_video_label.setStyleSheet("background-color: black; color: white;")
self.remote_video_label.setMinimumSize(320, 240)
self.remote_video_label.setPixmap(self.black_pixmap)
rx_layout.addWidget(self.remote_video_label, 1) # 允许缩放
main_layout.addWidget(tx_group, 1) # 允许缩放
main_layout.addWidget(rx_group, 1) # 允许缩放
self.set_enabled(False) # 默认禁用
def on_tx_toggled(self, checked):
if checked:
self.btn_start_tx.setText("停止发射")
self.start_tx_streaming.emit()
else:
self.btn_start_tx.setText("开始实时发射")
self.stop_tx_streaming.emit()
# 停止时，重置为黑屏
self.local_video_label.setPixmap(self.black_pixmap)
self.local_video_label.setText("本地摄像头已停止")
@pyqtSlot(QImage)
def on_local_frame_update(self, qimage: QImage):
"""[槽] 更新本地摄像头波形图"""
if self.btn_start_tx.isChecked() and not qimage.isNull():
self.local_video_label.setPixmap(QPixmap.fromImage(qimage))
@pyqtSlot(QImage)
def on_remote_frame_update(self, qimage: QImage):
"""[槽] 更新接收到的网络视频帧"""
if self.is_enabled:
if not qimage.isNull():
self.remote_video_label.setPixmap(QPixmap.fromImage(qimage))
else:
self.remote_video_label.setText("收到损坏的帧")
def set_enabled(self, enabled):
"""由主窗口调用，在连接后启用"""
self.is_enabled = enabled
self.btn_start_tx.setEnabled(enabled)
if not enabled:
# 如果禁用了，确保按钮恢复到未选中状态
if self.btn_start_tx.isChecked():
self.btn_start_tx.setChecked(False)
# 重置屏幕
self.local_video_label.setPixmap(self.black_pixmap)
self.local_video_label.setText("等待网络连接...")
self.remote_video_label.setPixmap(self.black_pixmap)
self.remote_video_label.setText("等待网络连接...") |