app.py

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 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
            with Image(width=video_width, height=video_height, background=Color(bg_color)) as img:
                lines = page.split("\n")
                for j, line in enumerate(lines):
                    draw.text(int(video_width / 2), (j + 1) * (text_size + 10), line)
                # Apply the drawing to the image
                draw(img)  # Correct usage to apply the drawing
                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