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【开源工具】音频格式转换大师：基于PyQt5与FFmpeg的高效格式转换工具开发全解析

news 来源：原创 2025/6/1 12:26:26

🎧 【开源工具】音频格式转换大师：基于PyQt5与FFmpeg的高效格式转换工具开发全解析

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🚀 概述

在数字音频处理领域，音频格式转换是一项基础但至关重要的功能。无论是音乐制作、播客编辑还是日常多媒体处理，我们经常需要在不同音频格式之间进行转换。本文介绍的全能音频转换大师是一款基于Python PyQt5框架开发，结合FFmpeg强大功能的图形化音频转换工具。

相较于市面上其他转换工具，本程序具有以下显著优势：

多格式支持：支持MP3、WAV、FLAC、AAC、OGG、M4A等主流音频格式互转
智能音质预设：提供高中低三档音质预设及自定义参数选项
批量处理：支持文件/文件夹批量导入，高效处理大量音频文件
可视化进度：实时显示转换进度和详细状态信息
智能预估：提前计算输出文件大小，合理规划存储空间
跨平台：基于Python开发，可在Windows、macOS、Linux系统运行

📊 功能详解

1. 文件管理功能

多种添加方式：支持文件添加、文件夹添加和拖拽添加三种方式
格式过滤：自动过滤非音频文件，确保输入文件有效性
列表管理：可查看已添加文件列表，支持清空列表操作

2. 输出设置

输出格式选择：通过下拉框选择目标格式
输出目录设置：可指定输出目录，默认使用源文件目录
原文件处理：可选转换后删除原文件以节省空间

3. 音质控制

预设方案：
- 高质量：320kbps比特率，48kHz采样率
- 中等质量：192kbps比特率，44.1kHz采样率
- 低质量：128kbps比特率，22kHz采样率
自定义参数：可自由设置比特率和采样率

4. 智能预估系统

基于文件时长和编码参数预估输出文件大小
计算压缩率，帮助用户做出合理决策
可视化显示输入输出总大小对比

5. 转换引擎

基于FFmpeg实现高质量音频转换
多线程处理，不阻塞UI界面
实时进度反馈，支持取消操作

🖼️ 软件效果展示

主界面布局

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转换过程截图

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完成提示

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🛠️ 开发步骤详解

1. 环境准备

# 必需依赖
pip install PyQt5
# FFmpeg需要单独安装
# Windows: 下载并添加至PATH
# macOS: brew install ffmpeg
# Linux: sudo apt install ffmpeg

2. 项目功能结构设计

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3. 核心类设计

AudioConverterThread (QThread)

处理音频转换的核心线程类，主要功能：

执行FFmpeg命令
解析进度信息
处理文件删除等后续操作
发送进度信号更新UI

AudioConverterApp (QMainWindow)

主窗口类，负责：

用户界面构建
事件处理
线程管理
状态更新

4. 关键技术实现

FFmpeg集成

def get_audio_duration(self, file_path):"""使用ffprobe获取音频时长"""cmd = ['ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'default=noprint_wrappers=1:nokey=1', file_path]result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)return float(result.stdout.strip())

进度解析

# 正则表达式匹配FFmpeg输出
self.duration_regex = re.compile(r"Duration: (\d{2}):(\d{2}):(\d{2})\.\d{2}")
self.time_regex = re.compile(r"time=(\d{2}):(\d{2}):(\d{2})\.\d{2}")# 在输出中匹配时间信息
time_match = self.time_regex.search(line)
if time_match:hours, minutes, seconds = map(int, time_match.groups())current_time = hours * 3600 + minutes * 60 + secondsprogress = min(100, int((current_time / duration) * 100))

拖拽支持

def dragEnterEvent(self, event: QDragEnterEvent):if event.mimeData().hasUrls():event.acceptProposedAction()def dropEvent(self, event: QDropEvent):urls = event.mimeData().urls()for url in urls:file_path = url.toLocalFile()# 处理文件或文件夹

🖥️ 代码深度解析

1. 多线程架构设计

音频转换是耗时操作，必须使用多线程避免界面冻结。我们继承QThread创建专门的工作线程：

class AudioConverterThread(QThread):progress_updated = pyqtSignal(int, str, str)  # 信号定义conversion_finished = pyqtSignal(str, bool, str)def run(self):# 转换逻辑实现for input_file in self.input_files:# 构建FFmpeg命令cmd = ['ffmpeg', '-i', input_file, '-y']# ...参数设置...# 执行转换process = subprocess.Popen(cmd, stderr=subprocess.PIPE)# 进度解析循环while True:line = process.stderr.readline()# ...解析进度...self.progress_updated.emit(progress, message, filename)

2. 音质参数系统

提供预设和自定义两种参数设置方式：

def set_quality_preset(self):"""根据预设设置默认参数"""if self.quality_preset == "high":self.bitrate = self.bitrate or 320self.samplerate = self.samplerate or 48000elif self.quality_preset == "medium":self.bitrate = self.bitrate or 192self.samplerate = self.samplerate or 44100elif self.quality_preset == "low":self.bitrate = self.bitrate or 128self.samplerate = self.samplerate or 22050

3. 文件大小预估算法

根据音频时长和编码参数预估输出大小：

def estimate_sizes(self):# 对于WAV格式，大小与时长和采样率成正比if self.output_format == "wav":estimated_size = input_size * 1.2  # 粗略估计else:# 对于有损压缩格式，大小=比特率×时长duration = self.get_audio_duration(input_file)estimated_size = (self.bitrate * 1000 * duration) / 8  # bit to bytes

4. 🎨 UI美化技巧

使用QSS样式表提升界面美观度：

self.setStyleSheet("""QMainWindow {background-color: #f5f5f5;}QGroupBox {border: 1px solid #ddd;border-radius: 8px;margin-top: 10px;}QPushButton {background-color: #4CAF50;color: white;border-radius: 4px;}QProgressBar::chunk {background-color: #4CAF50;}
""")

📥 完整源码下载

import os
import sys
import subprocess
from PyQt5.QtWidgets import (QApplication, QMainWindow, QWidget, QVBoxLayout, QHBoxLayout, QLabel, QPushButton, QListWidget, QFileDialog, QComboBox, QProgressBar, QMessageBox, QGroupBox, QSpinBox, QCheckBox, QSizePolicy, QRadioButton, QButtonGroup)
from PyQt5.QtCore import Qt, QThread, pyqtSignal, QUrl, QMimeData
from PyQt5.QtGui import QFont, QIcon, QColor, QPalette, QDragEnterEvent, QDropEventclass AudioConverterThread(QThread):progress_updated = pyqtSignal(int, str)conversion_finished = pyqtSignal(str, bool, str)estimation_ready = pyqtSignal(dict)def __init__(self, input_files, output_format, output_dir, quality_preset="medium", bitrate=None, samplerate=None, remove_original=False, estimate_only=False):super().__init__()self.input_files = input_filesself.output_format = output_formatself.output_dir = output_dirself.quality_preset = quality_presetself.bitrate = bitrateself.samplerate = samplerateself.remove_original = remove_originalself.estimate_only = estimate_onlyself.canceled = False# 根据品质预设设置默认参数self.set_quality_preset()def set_quality_preset(self):if self.quality_preset == "high":self.bitrate = self.bitrate or 320self.samplerate = self.samplerate or 48000elif self.quality_preset == "medium":self.bitrate = self.bitrate or 192self.samplerate = self.samplerate or 44100elif self.quality_preset == "low":self.bitrate = self.bitrate or 128self.samplerate = self.samplerate or 22050def run(self):total_files = len(self.input_files)total_size = 0estimated_sizes = {}for i, input_file in enumerate(self.input_files):if self.canceled:breaktry:# 获取文件信息filename = os.path.basename(input_file)base_name = os.path.splitext(filename)[0]output_file = os.path.join(self.output_dir, f"{base_name}.{self.output_format}")input_size = os.path.getsize(input_file)# 如果是预估模式if self.estimate_only:# 简化的预估算法 (实际大小会因编码效率而异)if self.output_format == "wav":# WAV通常是未压缩的，大小与采样率/位深相关estimated_size = input_size * 1.2  # 粗略估计else:# 压缩格式基于比特率估算duration = self.get_audio_duration(input_file)estimated_size = (self.bitrate * 1000 * duration) / 8  # bit to bytesestimated_sizes[filename] = {'input_size': input_size,'estimated_size': int(estimated_size),'input_path': input_file,'output_path': output_file}continue# 构建FFmpeg命令cmd = ['ffmpeg', '-i', input_file, '-y']  # -y 覆盖已存在文件# 添加音频参数if self.bitrate:cmd.extend(['-b:a', f'{self.bitrate}k'])if self.samplerate:cmd.extend(['-ar', str(self.samplerate)])cmd.append(output_file)# 执行转换process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True, bufsize=1)# 读取进度for line in process.stderr:if self.canceled:process.terminate()break# 解析进度信息if 'time=' in line:time_pos = line.find('time=')time_str = line[time_pos+5:time_pos+14]self.progress_updated.emit(int((i + 1) / total_files * 100), f"处理: {filename} ({time_str})")process.wait()if process.returncode == 0:# 如果选择删除原文件if self.remove_original:os.remove(input_file)output_size = os.path.getsize(output_file)total_size += output_sizeself.conversion_finished.emit(input_file, True, f"成功: {filename} ({self.format_size(output_size)})")else:self.conversion_finished.emit(input_file, False, f"失败: {filename} (错误代码: {process.returncode})")except Exception as e:self.conversion_finished.emit(input_file, False, f"错误: {filename} ({str(e)})")# 更新进度if not self.estimate_only:progress = int((i + 1) / total_files * 100)self.progress_updated.emit(progress, f"处理文件 {i+1}/{total_files}")if self.estimate_only:self.estimation_ready.emit(estimated_sizes)def get_audio_duration(self, file_path):"""获取音频文件时长(秒)"""try:cmd = ['ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'default=noprint_wrappers=1:nokey=1', file_path]result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)return float(result.stdout.strip())except:return 180  # 默认3分钟 (如果无法获取时长)@staticmethoddef format_size(size):"""格式化文件大小显示"""for unit in ['B', 'KB', 'MB', 'GB']:if size < 1024.0:return f"{size:.1f} {unit}"size /= 1024.0return f"{size:.1f} TB"class AudioConverterApp(QMainWindow):def __init__(self):super().__init__()self.setWindowTitle("音频格式转换工具")self.setGeometry(100, 100, 900, 700)self.setWindowIcon(QIcon.fromTheme("multimedia-volume-control"))# 初始化变量self.input_files = []self.output_dir = ""self.converter_thread = None# 设置样式self.setup_ui_style()# 初始化UIself.init_ui()self.setAcceptDrops(True)def setup_ui_style(self):# 设置应用程序样式self.setStyleSheet("""QMainWindow {background-color: #f5f5f5;}QGroupBox {border: 1px solid #ddd;border-radius: 8px;margin-top: 10px;padding-top: 15px;font-weight: bold;color: #555;background-color: white;}QGroupBox::title {subcontrol-origin: margin;left: 10px;padding: 0 3px;}QPushButton {background-color: #4CAF50;color: white;border: none;padding: 8px 16px;border-radius: 4px;font-size: 14px;min-width: 100px;}QPushButton:hover {background-color: #45a049;}QPushButton:disabled {background-color: #cccccc;}QPushButton#cancelButton {background-color: #f44336;}QPushButton#cancelButton:hover {background-color: #d32f2f;}QListWidget {background-color: white;border: 1px solid #ddd;border-radius: 4px;padding: 5px;}QProgressBar {border: 1px solid #ddd;border-radius: 4px;text-align: center;height: 20px;}QProgressBar::chunk {background-color: #4CAF50;width: 10px;}QComboBox, QSpinBox {padding: 5px;border: 1px solid #ddd;border-radius: 4px;background-color: white;min-width: 120px;}QRadioButton {spacing: 5px;}QLabel#sizeLabel {color: #666;font-size: 13px;}QLabel#titleLabel {color: #2c3e50;}""")# 设置调色板palette = self.palette()palette.setColor(QPalette.Window, QColor(245, 245, 245))palette.setColor(QPalette.WindowText, QColor(51, 51, 51))palette.setColor(QPalette.Base, QColor(255, 255, 255))palette.setColor(QPalette.AlternateBase, QColor(240, 240, 240))palette.setColor(QPalette.ToolTipBase, QColor(255, 255, 220))palette.setColor(QPalette.ToolTipText, QColor(0, 0, 0))palette.setColor(QPalette.Text, QColor(0, 0, 0))palette.setColor(QPalette.Button, QColor(240, 240, 240))palette.setColor(QPalette.ButtonText, QColor(0, 0, 0))palette.setColor(QPalette.BrightText, QColor(255, 0, 0))palette.setColor(QPalette.Highlight, QColor(76, 175, 80))palette.setColor(QPalette.HighlightedText, QColor(255, 255, 255))self.setPalette(palette)def init_ui(self):# 主窗口部件central_widget = QWidget()self.setCentralWidget(central_widget)# 主布局main_layout = QVBoxLayout(central_widget)main_layout.setSpacing(15)main_layout.setContentsMargins(20, 20, 20, 20)# 标题title_label = QLabel("🎵 音频格式转换工具")title_label.setObjectName("titleLabel")title_label.setFont(QFont("Arial", 18, QFont.Bold))title_label.setAlignment(Qt.AlignCenter)main_layout.addWidget(title_label)# 文件选择区域file_group = QGroupBox("📁 选择音频文件 (支持拖拽文件到此处)")file_layout = QVBoxLayout()self.file_list = QListWidget()self.file_list.setSelectionMode(QListWidget.ExtendedSelection)file_button_layout = QHBoxLayout()self.add_file_btn = QPushButton("➕ 添加文件")self.add_file_btn.clicked.connect(self.add_files)self.add_folder_btn = QPushButton("📂 添加文件夹")self.add_folder_btn.clicked.connect(self.add_folder)self.clear_btn = QPushButton("❌ 清空列表")self.clear_btn.clicked.connect(self.clear_files)file_button_layout.addWidget(self.add_file_btn)file_button_layout.addWidget(self.add_folder_btn)file_button_layout.addWidget(self.clear_btn)file_layout.addWidget(self.file_list)file_layout.addLayout(file_button_layout)file_group.setLayout(file_layout)main_layout.addWidget(file_group)# 输出设置区域output_group = QGroupBox("⚙️ 输出设置")output_layout = QHBoxLayout()# 输出格式format_layout = QVBoxLayout()format_label = QLabel("🎚️ 输出格式:")self.format_combo = QComboBox()self.format_combo.addItems(["mp3", "wav", "flac", "aac", "ogg", "m4a"])format_layout.addWidget(format_label)format_layout.addWidget(self.format_combo)# 输出目录dir_layout = QVBoxLayout()dir_label = QLabel("📁 输出目录:")self.dir_btn = QPushButton("选择目录")self.dir_btn.clicked.connect(self.select_output_dir)self.dir_label = QLabel("(默认: 原文件目录)")self.dir_label.setWordWrap(True)dir_layout.addWidget(dir_label)dir_layout.addWidget(self.dir_btn)dir_layout.addWidget(self.dir_label)# 其他选项options_layout = QVBoxLayout()self.remove_original_cb = QCheckBox("🗑️ 转换后删除原文件")options_layout.addWidget(self.remove_original_cb)output_layout.addLayout(format_layout)output_layout.addLayout(dir_layout)output_layout.addLayout(options_layout)output_group.setLayout(output_layout)main_layout.addWidget(output_group)# 音质设置区域quality_group = QGroupBox("🎚️ 音质设置")quality_layout = QHBoxLayout()# 音质预设preset_layout = QVBoxLayout()preset_label = QLabel("📊 音质预设:")self.quality_group = QButtonGroup()self.high_quality_rb = QRadioButton("🎼 高质量 (320kbps, 48kHz)")self.medium_quality_rb = QRadioButton("🎵 中等质量 (192kbps, 44.1kHz)")self.low_quality_rb = QRadioButton("📻 低质量 (128kbps, 22kHz)")self.custom_quality_rb = QRadioButton("⚙️ 自定义参数")self.quality_group.addButton(self.high_quality_rb, 0)self.quality_group.addButton(self.medium_quality_rb, 1)self.quality_group.addButton(self.low_quality_rb, 2)self.quality_group.addButton(self.custom_quality_rb, 3)self.medium_quality_rb.setChecked(True)self.quality_group.buttonClicked.connect(self.update_quality_settings)preset_layout.addWidget(preset_label)preset_layout.addWidget(self.high_quality_rb)preset_layout.addWidget(self.medium_quality_rb)preset_layout.addWidget(self.low_quality_rb)preset_layout.addWidget(self.custom_quality_rb)# 自定义参数custom_layout = QVBoxLayout()bitrate_layout = QHBoxLayout()bitrate_label = QLabel("🔊 比特率 (kbps):")self.bitrate_spin = QSpinBox()self.bitrate_spin.setRange(32, 320)self.bitrate_spin.setValue(192)self.bitrate_spin.setSpecialValueText("自动")bitrate_layout.addWidget(bitrate_label)bitrate_layout.addWidget(self.bitrate_spin)samplerate_layout = QHBoxLayout()samplerate_label = QLabel("📶 采样率 (Hz):")self.samplerate_spin = QSpinBox()self.samplerate_spin.setRange(8000, 48000)self.samplerate_spin.setValue(44100)self.samplerate_spin.setSingleStep(1000)self.samplerate_spin.setSpecialValueText("自动")samplerate_layout.addWidget(samplerate_label)samplerate_layout.addWidget(self.samplerate_spin)custom_layout.addLayout(bitrate_layout)custom_layout.addLayout(samplerate_layout)quality_layout.addLayout(preset_layout)quality_layout.addLayout(custom_layout)quality_group.setLayout(quality_layout)main_layout.addWidget(quality_group)# 文件大小预估区域size_group = QGroupBox("📊 文件大小预估")size_layout = QVBoxLayout()self.size_label = QLabel("ℹ️ 添加文件后自动预估输出大小")self.size_label.setObjectName("sizeLabel")self.size_label.setWordWrap(True)self.estimate_btn = QPushButton("🔍 重新估算大小")self.estimate_btn.clicked.connect(self.estimate_sizes)self.estimate_btn.setEnabled(False)size_layout.addWidget(self.size_label)size_layout.addWidget(self.estimate_btn)size_group.setLayout(size_layout)main_layout.addWidget(size_group)# 进度条self.progress_bar = QProgressBar()self.progress_bar.setAlignment(Qt.AlignCenter)main_layout.addWidget(self.progress_bar)# 转换按钮button_layout = QHBoxLayout()self.convert_btn = QPushButton("✨ 开始转换")self.convert_btn.setFont(QFont("Arial", 12, QFont.Bold))self.convert_btn.clicked.connect(self.start_conversion)self.cancel_btn = QPushButton("⏹️ 取消")self.cancel_btn.setObjectName("cancelButton")self.cancel_btn.setFont(QFont("Arial", 12))self.cancel_btn.clicked.connect(self.cancel_conversion)self.cancel_btn.setEnabled(False)button_layout.addStretch()button_layout.addWidget(self.convert_btn)button_layout.addWidget(self.cancel_btn)button_layout.addStretch()main_layout.addLayout(button_layout)# 状态栏self.statusBar().showMessage("🟢 准备就绪")# 初始化UI状态self.update_quality_settings()def dragEnterEvent(self, event: QDragEnterEvent):if event.mimeData().hasUrls():event.acceptProposedAction()def dropEvent(self, event: QDropEvent):urls = event.mimeData().urls()new_files = []for url in urls:file_path = url.toLocalFile()if os.path.isdir(file_path):# 处理文件夹audio_files = self.scan_audio_files(file_path)new_files.extend(audio_files)elif file_path.lower().endswith(('.mp3', '.wav', '.flac', '.aac', '.ogg', '.m4a')):# 处理单个文件new_files.append(file_path)if new_files:self.input_files.extend(new_files)self.file_list.addItems([os.path.basename(f) for f in new_files])self.update_status(f"添加了 {len(new_files)} 个文件")self.estimate_sizes()def scan_audio_files(self, folder):"""扫描文件夹中的音频文件"""audio_files = []for root, _, files in os.walk(folder):for file in files:if file.lower().endswith(('.mp3', '.wav', '.flac', '.aac', '.ogg', '.m4a')):audio_files.append(os.path.join(root, file))return audio_filesdef add_files(self):files, _ = QFileDialog.getOpenFileNames(self, "选择音频文件", "", "音频文件 (*.mp3 *.wav *.flac *.aac *.ogg *.m4a);;所有文件 (*.*)")if files:self.input_files.extend(files)self.file_list.addItems([os.path.basename(f) for f in files])self.update_status(f"添加了 {len(files)} 个文件")self.estimate_sizes()def add_folder(self):folder = QFileDialog.getExistingDirectory(self, "选择文件夹")if folder:audio_files = self.scan_audio_files(folder)if audio_files:self.input_files.extend(audio_files)self.file_list.addItems([os.path.basename(f) for f in audio_files])self.update_status(f"从文件夹添加了 {len(audio_files)} 个音频文件")self.estimate_sizes()else:self.update_status("⚠️ 所选文件夹中没有找到音频文件", is_error=True)def clear_files(self):self.input_files = []self.file_list.clear()self.size_label.setText("ℹ️ 添加文件后自动预估输出大小")self.update_status("文件列表已清空")self.estimate_btn.setEnabled(False)def select_output_dir(self):dir_path = QFileDialog.getExistingDirectory(self, "选择输出目录")if dir_path:self.output_dir = dir_pathself.dir_label.setText(dir_path)self.update_status(f"输出目录设置为: {dir_path}")def update_status(self, message, is_error=False):emoji = "⚠️" if is_error else "ℹ️"self.statusBar().showMessage(f"{emoji} {message}")def update_quality_settings(self):"""根据选择的音质预设更新UI"""if self.high_quality_rb.isChecked():self.bitrate_spin.setValue(320)self.samplerate_spin.setValue(48000)self.bitrate_spin.setEnabled(False)self.samplerate_spin.setEnabled(False)elif self.medium_quality_rb.isChecked():self.bitrate_spin.setValue(192)self.samplerate_spin.setValue(44100)self.bitrate_spin.setEnabled(False)self.samplerate_spin.setEnabled(False)elif self.low_quality_rb.isChecked():self.bitrate_spin.setValue(128)self.samplerate_spin.setValue(22050)self.bitrate_spin.setEnabled(False)self.samplerate_spin.setEnabled(False)else:  # 自定义self.bitrate_spin.setEnabled(True)self.samplerate_spin.setEnabled(True)# 只有在有文件时才尝试估算大小if hasattr(self, 'input_files') and self.input_files:self.estimate_sizes()def estimate_sizes(self):"""预估输出文件大小"""if not self.input_files:self.size_label.setText("ℹ️ 请先添加要转换的文件")returnoutput_format = self.format_combo.currentText()# 如果没有指定输出目录，使用原文件目录output_dir = self.output_dir if self.output_dir else os.path.dirname(self.input_files[0])# 获取当前选择的音质预设if self.high_quality_rb.isChecked():quality_preset = "high"elif self.medium_quality_rb.isChecked():quality_preset = "medium"elif self.low_quality_rb.isChecked():quality_preset = "low"else:quality_preset = "custom"# 创建估算线程self.size_label.setText("🔍 正在估算输出文件大小...")self.estimate_btn.setEnabled(False)self.converter_thread = AudioConverterThread(self.input_files, output_format, output_dir, quality_preset=quality_preset,bitrate=self.bitrate_spin.value() if self.bitrate_spin.value() > 0 else None,samplerate=self.samplerate_spin.value() if self.samplerate_spin.value() > 0 else None,estimate_only=True)self.converter_thread.estimation_ready.connect(self.update_size_estimation)self.converter_thread.finished.connect(lambda: self.estimate_btn.setEnabled(True))self.converter_thread.start()def update_size_estimation(self, estimations):"""更新大小预估显示"""total_input = sum(info['input_size'] for info in estimations.values())total_output = sum(info['estimated_size'] for info in estimations.values())ratio = (total_output / total_input) if total_input > 0 else 0ratio_text = f"{ratio:.1%}" if ratio > 0 else "N/A"text = (f"📊 预估输出大小:\n"f"输入总大小: {self.format_size(total_input)}\n"f"预估输出总大小: {self.format_size(total_output)}\n"f"压缩率: {ratio_text}")self.size_label.setText(text)self.estimate_btn.setEnabled(True)@staticmethoddef format_size(size):"""格式化文件大小显示"""for unit in ['B', 'KB', 'MB', 'GB']:if size < 1024.0:return f"{size:.1f} {unit}"size /= 1024.0return f"{size:.1f} TB"def start_conversion(self):if not self.input_files:self.update_status("⚠️ 请先添加要转换的文件", is_error=True)returnoutput_format = self.format_combo.currentText()# 如果没有指定输出目录，使用原文件目录if not self.output_dir:self.output_dir = os.path.dirname(self.input_files[0])self.dir_label.setText("(使用原文件目录)")# 获取音质预设if self.high_quality_rb.isChecked():quality_preset = "high"elif self.medium_quality_rb.isChecked():quality_preset = "medium"elif self.low_quality_rb.isChecked():quality_preset = "low"else:quality_preset = "custom"# 获取其他参数bitrate = self.bitrate_spin.value() if self.bitrate_spin.value() > 0 else Nonesamplerate = self.samplerate_spin.value() if self.samplerate_spin.value() > 0 else Noneremove_original = self.remove_original_cb.isChecked()# 禁用UI控件self.toggle_ui(False)# 创建并启动转换线程self.converter_thread = AudioConverterThread(self.input_files, output_format, self.output_dir, quality_preset=quality_preset,bitrate=bitrate, samplerate=samplerate, remove_original=remove_original)self.converter_thread.progress_updated.connect(self.update_progress)self.converter_thread.conversion_finished.connect(self.conversion_result)self.converter_thread.finished.connect(self.conversion_complete)self.converter_thread.start()self.update_status("🔄 开始转换文件...")def cancel_conversion(self):if self.converter_thread and self.converter_thread.isRunning():self.converter_thread.canceled = Trueself.update_status("⏹️ 正在取消转换...")self.cancel_btn.setEnabled(False)def update_progress(self, value, message):self.progress_bar.setValue(value)self.update_status(message)def conversion_result(self, filename, success, message):base_name = os.path.basename(filename)item = self.file_list.findItems(base_name, Qt.MatchExactly)if item:if success:item[0].setForeground(QColor(0, 128, 0))  # 绿色表示成功else:item[0].setForeground(QColor(255, 0, 0))  # 红色表示失败self.update_status(message, not success)def conversion_complete(self):if self.converter_thread.canceled:self.update_status("⏹️ 转换已取消", is_error=True)else:self.update_status("🎉 所有文件转换完成!")# 重置UIself.progress_bar.setValue(0)self.toggle_ui(True)# 如果选择了删除原文件，清空列表if self.remove_original_cb.isChecked():self.input_files = []self.file_list.clear()self.size_label.setText("ℹ️ 添加文件后自动预估输出大小")def toggle_ui(self, enabled):self.add_file_btn.setEnabled(enabled)self.add_folder_btn.setEnabled(enabled)self.clear_btn.setEnabled(enabled)self.format_combo.setEnabled(enabled)self.dir_btn.setEnabled(enabled)self.high_quality_rb.setEnabled(enabled)self.medium_quality_rb.setEnabled(enabled)self.low_quality_rb.setEnabled(enabled)self.custom_quality_rb.setEnabled(enabled)self.bitrate_spin.setEnabled(enabled and self.custom_quality_rb.isChecked())self.samplerate_spin.setEnabled(enabled and self.custom_quality_rb.isChecked())self.remove_original_cb.setEnabled(enabled)self.convert_btn.setEnabled(enabled)self.cancel_btn.setEnabled(not enabled)self.estimate_btn.setEnabled(enabled and bool(self.input_files))def closeEvent(self, event):if self.converter_thread and self.converter_thread.isRunning():reply = QMessageBox.question(self, '转换正在进行中',"转换仍在进行中，确定要退出吗?",QMessageBox.Yes | QMessageBox.No, QMessageBox.No)if reply == QMessageBox.Yes:self.converter_thread.canceled = Trueevent.accept()else:event.ignore()else:event.accept()if __name__ == "__main__":# 检查FFmpeg是否可用try:subprocess.run(['ffmpeg', '-version'], check=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)except FileNotFoundError:app = QApplication(sys.argv)QMessageBox.critical(None, "错误", "未找到FFmpeg，请先安装FFmpeg并确保它在系统路径中。\n\n""Windows用户可以从 https://ffmpeg.org/download.html 下载\n""macOS: brew install ffmpeg\n""Linux: sudo apt install ffmpeg")sys.exit(1)app = QApplication(sys.argv)converter = AudioConverterApp()converter.show()sys.exit(app.exec_())