153 lines
5.4 KiB
Python
153 lines
5.4 KiB
Python
import base64
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import io
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from PIL import Image
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from src.common.logger import get_logger
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from .payload_content.message import Message, MessageBuilder
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logger = get_logger("消息压缩工具")
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def compress_messages(
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messages: list[Message], img_target_size: int = 1 * 1024 * 1024
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) -> list[Message]:
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"""
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压缩消息列表中的图片
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:param messages: 消息列表
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:param img_target_size: 图片目标大小，默认1MB
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:return: 压缩后的消息列表
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"""
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def reformat_static_image(image_data: bytes) -> bytes:
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"""
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将静态图片转换为JPEG格式
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:param image_data: 图片数据
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:return: 转换后的图片数据
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"""
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try:
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image = Image.open(image_data)
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if image.format and (
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image.format.upper() in ["JPEG", "JPG", "PNG", "WEBP"]
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):
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# 静态图像，转换为JPEG格式
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reformated_image_data = io.BytesIO()
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image.save(
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reformated_image_data, format="JPEG", quality=95, optimize=True
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)
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image_data = reformated_image_data.getvalue()
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return image_data
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except Exception as e:
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logger.error(f"图片转换格式失败: {str(e)}")
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return image_data
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def rescale_image(
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image_data: bytes, scale: float
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) -> tuple[bytes, tuple[int, int] | None, tuple[int, int] | None]:
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"""
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缩放图片
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:param image_data: 图片数据
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:param scale: 缩放比例
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:return: 缩放后的图片数据
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"""
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try:
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image = Image.open(image_data)
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# 原始尺寸
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original_size = (image.width, image.height)
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# 计算新的尺寸
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new_size = (int(original_size[0] * scale), int(original_size[1] * scale))
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output_buffer = io.BytesIO()
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if getattr(image, "is_animated", False):
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# 动态图片，处理所有帧
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frames = []
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new_size = (new_size[0] // 2, new_size[1] // 2) # 动图，缩放尺寸再打折
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for frame_idx in range(getattr(image, "n_frames", 1)):
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image.seek(frame_idx)
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new_frame = image.copy()
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new_frame = new_frame.resize(new_size, Image.Resampling.LANCZOS)
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frames.append(new_frame)
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# 保存到缓冲区
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frames[0].save(
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output_buffer,
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format="GIF",
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save_all=True,
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append_images=frames[1:],
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optimize=True,
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duration=image.info.get("duration", 100),
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loop=image.info.get("loop", 0),
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)
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else:
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# 静态图片，直接缩放保存
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resized_image = image.resize(new_size, Image.Resampling.LANCZOS)
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resized_image.save(
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output_buffer, format="JPEG", quality=95, optimize=True
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)
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return output_buffer.getvalue(), original_size, new_size
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except Exception as e:
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logger.error(f"图片缩放失败: {str(e)}")
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import traceback
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logger.error(traceback.format_exc())
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return image_data, None, None
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def compress_base64_image(
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base64_data: str, target_size: int = 1 * 1024 * 1024
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) -> str:
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original_b64_data_size = len(base64_data) # 计算原始数据大小
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image_data = base64.b64decode(base64_data)
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# 先尝试转换格式为JPEG
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image_data = reformat_static_image(image_data)
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base64_data = base64.b64encode(image_data).decode("utf-8")
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if len(base64_data) <= target_size:
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# 如果转换后小于目标大小，直接返回
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logger.info(
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f"成功将图片转为JPEG格式，编码后大小: {len(base64_data) / 1024:.1f}KB"
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)
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return base64_data
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# 如果转换后仍然大于目标大小，进行尺寸压缩
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scale = min(1.0, target_size / len(base64_data))
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image_data, original_size, new_size = rescale_image(image_data, scale)
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base64_data = base64.b64encode(image_data).decode("utf-8")
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if original_size and new_size:
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logger.info(
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f"压缩图片: {original_size[0]}x{original_size[1]} -> {new_size[0]}x{new_size[1]}\n"
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f"压缩前大小: {original_b64_data_size / 1024:.1f}KB, 压缩后大小: {len(base64_data) / 1024:.1f}KB"
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)
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return base64_data
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compressed_messages = []
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for message in messages:
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if isinstance(message.content, list):
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# 检查content，如有图片则压缩
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message_builder = MessageBuilder()
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for content_item in message.content:
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if isinstance(content_item, tuple):
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# 图片，进行压缩
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message_builder.add_image_content(
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content_item[0],
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compress_base64_image(
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content_item[1], target_size=img_target_size
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),
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)
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else:
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message_builder.add_text_content(content_item)
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compressed_messages.append(message_builder.build())
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else:
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compressed_messages.append(message)
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return compressed_messages
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