app.py

import os
import tempfile
import asyncio
from moviepy.editor import AudioFileClip, ImageClip, concatenate_videoclips
from wand.image import Image
from wand.color import Color
from wand.drawing import Drawing
from gtts import gTTS

# 文本转语音功能
async def text_to_speech(text, voice, rate, pitch):
    # 使用 gTTS 生成语音
    tts = gTTS(text=text, lang=voice)
    audio_file = os.path.join(tempfile.gettempdir(), "audio.mp3")
    tts.save(audio_file)
    return audio_file, None

# 文字转视频功能
def text_to_video(text, voice, rate, pitch, video_width, video_height, bg_color, text_color, text_font, text_size):
    # 字体文件路径
    font_path = os.path.abspath(text_font)

    # 计算每页可以容纳的行数和每行可以容纳的字符数
    max_chars_per_line = video_width // (text_size // 2)  # 字体宽度假设为字体大小的一半
    max_lines_per_page = video_height // (text_size + 15)  # 10是行间距

    # 按页拆分文本
    words = text.split()
    lines = []
    current_line = ""
    pages = []
    
    for word in words:
        if len(current_line) + len(word) + 1 > max_chars_per_line:
            lines.append(current_line)
            current_line = word
            if len(lines) == max_lines_per_page:
                pages.append("\n".join(lines))
                lines = []
        else:
            current_line = f"{current_line} {word}".strip()
    
    lines.append(current_line)
    if lines:
        pages.append("\n".join(lines))

    # 为每页生成独立音频
    audio_clips = []
    video_clips = []
    for i, page in enumerate(pages):
        # 将每页的文本连贯朗读生成一个音频文件
        audio_text = page.replace("\n", " ")  # 移除换行符以防止 TTS 停顿
        audio, warning = asyncio.run(text_to_speech(audio_text, voice, rate, pitch))
        if warning:
            return None, warning
        audio_clip = AudioFileClip(audio)
        audio_clips.append(audio_clip)

        # 使用 wand 生成视频片段
        with Image(width=video_width, height=video_height, background=Color(bg_color)) as img:
            with Drawing() as draw:
                draw.font = font_path
                draw.font_size = text_size
                draw.fill_color = Color(text_color)
                draw.text_alignment = 'center'
                draw.text_interline_spacing = 10
                
                # Calculate the y position for each line of text
                lines = page.split("\n")
                y_position = int((video_height - (len(lines) * (text_size + 10))) / 2)  # Center vertically
                
                for line in lines:
                    draw.text(int(video_width / 2), y_position, line)
                    y_position += int(text_size + 10)  # Move down for the next line (ensure y_position is an integer)
                
                draw(img)  # Draw the text on the image

            img.format = 'png'
            img_path = os.path.join(tempfile.gettempdir(), f"page_{i}.png")
            img.save(filename=img_path)
            text_clip = ImageClip(img_path).set_duration(audio_clip.duration).set_audio(audio_clip)
            video_clips.append(text_clip)
        
    # 合并所有视频片段
    final_video = concatenate_videoclips(video_clips)
    final_video_path = os.path.join(tempfile.gettempdir(), "output_video.mp4")
    final_video.write_videofile(final_video_path, fps=24, codec="libx264")
    return final_video_path, None

# 示例函数调用（请根据需要调整）
if __name__ == "__main__":
    # 测试功能
    text = "你好，这是一个测试视频。"
    voice = "zh"
    rate = 1.0
    pitch = 1.0
    video_width = 640
    video_height = 480
    bg_color = "white"
    text_color = "black"
    text_font = "path/to/your/font.ttf"  # 更新为实际字体路径
    text_size = 30

    video_path, warning = text_to_video(text, voice, rate, pitch, video_width, video_height, bg_color, text_color, text_font, text_size)
    if warning:
        print("Warning:", warning)
    else:
        print("Video saved at:", video_path)