app.py

# PyTorch 2.8 (temporary hack)
import os
os.system('pip install --upgrade --pre --extra-index-url https://download.pytorch.org/whl/nightly/cu126 "torch<2.9" spaces')

# Actual demo code
import spaces
import torch
from diffusers.pipelines.wan.pipeline_wan_i2v import WanImageToVideoPipeline
from diffusers.models.transformers.transformer_wan import WanTransformer3DModel
from diffusers.utils.export_utils import export_to_video
import gradio as gr
import tempfile
import numpy as np
from PIL import Image
import random
import gc
from optimization import optimize_pipeline_
from huggingface_hub import hf_hub_download

SECRET_KEY = os.environ.get("SECRET_KEY")

# 如果在 Space 中没有设置密钥
if not SECRET_KEY:
    raise ValueError("请设置 SECRET_KEY 环境变量。")

MODEL_ID = "Wan-AI/Wan2.2-I2V-A14B-Diffusers"

# 在这里配置所有的 LoRA。
LORA_REPO_ID = "IdlecloudX/Flux_and_Wan_Lora"
LORA_SETS = {
    "NF": {
        "high_noise": {"file": "NSFW-22-H-e8.safetensors", "adapter_name": "nf_high"},
        "low_noise": {"file": "NSFW-22-L-e8.safetensors", "adapter_name": "nf_low"}
    },
    "BP": {
        "high_noise": {"file": "Wan2.2_BP-v1-HighNoise-I2V_T2V.safetensors", "adapter_name": "bp_high"},
        "low_noise": {"file": "Wan2.2_BP-v1-LowNoise-I2V_T2V.safetensors", "adapter_name": "bp_low"}
    },
    "Py-v1": {
        "high_noise": {"file": "WAN2.2-HighNoise_Pyv1-I2V_T2V.safetensors", "adapter_name": "py_high"},
        "low_noise": {"file": "WAN2.2-LowNoise_Pyv1-I2V_T2V.safetensors", "adapter_name": "py_low"}
    }
}

LANDSCAPE_WIDTH = 832
LANDSCAPE_HEIGHT = 576
MAX_SEED = np.iinfo(np.int32).max

FIXED_FPS = 16
MIN_FRAMES_MODEL = 8
MAX_FRAMES_MODEL = 81

MIN_DURATION = round(MIN_FRAMES_MODEL/FIXED_FPS,1)
MAX_DURATION = round(MAX_FRAMES_MODEL/FIXED_FPS,1)


pipe = WanImageToVideoPipeline.from_pretrained(MODEL_ID,
    transformer=WanTransformer3DModel.from_pretrained('cbensimon/Wan2.2-I2V-A14B-bf16-Diffusers',
        subfolder='transformer',
        torch_dtype=torch.bfloat16,
        device_map='cuda',
    ),
    transformer_2=WanTransformer3DModel.from_pretrained('cbensimon/Wan2.2-I2V-A14B-bf16-Diffusers',
        subfolder='transformer_2',
        torch_dtype=torch.bfloat16,
        device_map='cuda',
    ),
    torch_dtype=torch.bfloat16,
).to('cuda')


print("开始优化 Pipeline...")
optimize_pipeline_(pipe,
    image=Image.new('RGB', (LANDSCAPE_WIDTH, LANDSCAPE_HEIGHT)),
    prompt='prompt',
    height=LANDSCAPE_HEIGHT,
    width=LANDSCAPE_WIDTH,
    num_frames=MAX_FRAMES_MODEL,
)
print("优化完成。")

for name, lora_set in LORA_SETS.items():
    print(f"--- 开始加载 LoRA 集合: {name} ---")

    # 加载 High Noise
    high_noise_config = lora_set["high_noise"]
    print(f"正在加载 High Noise: {high_noise_config['file']}...")
    pipe.load_lora_weights(LORA_REPO_ID, weight_name=high_noise_config['file'], adapter_name=high_noise_config['adapter_name'])
    print("High Noise LoRA 加载完成。")

    # 加载 Low Noise
    low_noise_config = lora_set["low_noise"]
    print(f"正在加载 Low Noise: {low_noise_config['file']}...")
    pipe.load_lora_weights(LORA_REPO_ID, weight_name=low_noise_config['file'], adapter_name=low_noise_config['adapter_name'])
    print("Low Noise LoRA 加载完成。")
print("所有自定义 LoRA 加载完毕。")

for i in range(3):
    gc.collect()
    torch.cuda.synchronize()
    torch.cuda.empty_cache()

default_prompt_i2v = "make this image come alive, cinematic motion, smooth animation"
default_negative_prompt = "色调艳丽, 过曝, 静态, 细节模糊不清, 字幕, 风格, 作品, 画作, 画面, 静止, 整体发灰, 最差质量, 低质量, JPEG压缩残留, 丑陋的, 残缺的, 多余的手指, 画得不好的手部, 画得不好的脸部, 畸形的, 毁容的, 形态畸形的肢体, 手指融合, 静止不动的画面, 杂乱的背景, 三条腿, 背景人很多, 倒着走"


def resize_image(image: Image.Image) -> Image.Image:
    if image.height > image.width:
        transposed = image.transpose(Image.Transpose.ROTATE_90)
        resized = resize_image_landscape(transposed)
        return resized.transpose(Image.Transpose.ROTATE_270)
    return resize_image_landscape(image)


def resize_image_landscape(image: Image.Image) -> Image.Image:
    target_aspect = LANDSCAPE_WIDTH / LANDSCAPE_HEIGHT
    width, height = image.size
    in_aspect = width / height
    if in_aspect > target_aspect:
        new_width = round(height * target_aspect)
        left = (width - new_width) // 2
        image = image.crop((left, 0, left + new_width, height))
    else:
        new_height = round(width / target_aspect)
        top = (height - new_height) // 2
        image = image.crop((0, top, width, top + new_height))
    return image.resize((LANDSCAPE_WIDTH, LANDSCAPE_HEIGHT), Image.LANCZOS)

def get_duration(
    secret_key,
    input_image,
    prompt,
    steps,
    negative_prompt,
    duration_seconds,
    guidance_scale,
    guidance_scale_2,
    seed,
    randomize_seed,
    selected_loras,
    progress,
):
    return int(steps) * 15

@spaces.GPU(duration=get_duration)
def generate_video(
    secret_key,
    input_image,
    prompt,
    steps = 4,
    negative_prompt=default_negative_prompt,
    duration_seconds = MAX_DURATION,
    guidance_scale = 1,
    guidance_scale_2 = 1,
    seed = 42,
    randomize_seed = False,
    selected_loras = [],
    progress=gr.Progress(track_tqdm=True),
):
    if secret_key != SECRET_KEY:
        raise gr.Error("无效的密钥！请输入正确的密钥。")

    if input_image is None:
        raise gr.Error("Please upload an input image.")

    num_frames = np.clip(int(round(duration_seconds * FIXED_FPS)), MIN_FRAMES_MODEL, MAX_FRAMES_MODEL)
    current_seed = random.randint(0, MAX_SEED) if randomize_seed else int(seed)
    resized_image = resize_image(input_image)

    num_inference_steps = int(steps)
    switch_step = num_inference_steps // 2

    class LoraSwitcher:
        def __init__(self, selected_lora_names):
            self.switched = False
            self.high_noise_adapters = []
            self.low_noise_adapters = []

            if selected_lora_names:
                for name in selected_lora_names:
                    if name in LORA_SETS:
                        self.high_noise_adapters.append(LORA_SETS[name]["high_noise"]["adapter_name"])
                        self.low_noise_adapters.append(LORA_SETS[name]["low_noise"]["adapter_name"])

        def __call__(self, pipe, step_index, timestep, callback_kwargs):
            # 在第一步设置正确的 LoRA 状态
            if step_index == 0:
                self.switched = False
                # 如果用户选择了 LoRA，则激活 High Noise 版本
                if self.high_noise_adapters:
                    print(f"激活 High Noise LoRA: {self.high_noise_adapters}")
                    pipe.set_adapters(self.high_noise_adapters, adapter_weights=[1.0] * len(self.high_noise_adapters))
                # 如果用户没有选择 LoRA，则通过将权重设为0来禁用任何可能残留的 LoRA
                elif pipe.get_active_adapters():
                    active_adapters = pipe.get_active_adapters()
                    print(f"未选择 LoRA，通过设置权重为0来禁用残留的 LoRA: {active_adapters}")
                    pipe.set_adapters(active_adapters, adapter_weights=[0.0] * len(active_adapters))

            # 在切换点，切换到 Low Noise LoRA（仅当有 LoRA 被选择时）
            if self.low_noise_adapters and step_index >= switch_step and not self.switched:
                print(f"在第 {step_index} 步切换到 Low Noise LoRA: {self.low_noise_adapters}")
                pipe.set_adapters(self.low_noise_adapters, adapter_weights=[1.0] * len(self.low_noise_adapters))
                self.switched = True
            return callback_kwargs

    lora_switcher_callback = LoraSwitcher(selected_loras)

    output_frames_list = pipe(
        image=resized_image,
        prompt=prompt,
        negative_prompt=negative_prompt,
        height=resized_image.height,
        width=resized_image.width,
        num_frames=num_frames,
        guidance_scale=float(guidance_scale),
        guidance_scale_2=float(guidance_scale_2),
        num_inference_steps=num_inference_steps,
        generator=torch.Generator(device="cuda").manual_seed(current_seed),
        callback_on_step_end=lora_switcher_callback,
    ).frames[0]

    with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as tmpfile:
        video_path = tmpfile.name

    export_to_video(output_frames_list, video_path, fps=FIXED_FPS)

    return video_path, current_seed

with gr.Blocks() as demo:
    gr.Markdown("# Fast 4 steps Wan 2.2 I2V (14B) with Lightning LoRA")
    gr.Markdown("run Wan 2.2 in just 4-8 steps, with [Lightning LoRA](https://huggingface.co/Kijai/WanVideo_comfy/tree/main/Wan22-Lightning), fp8 quantization & AoT compilation - compatible with 🧨 diffusers and ZeroGPU⚡️")
    with gr.Row():
        with gr.Column():
            secret_key_input = gr.Textbox(label="密钥 (Secret Key)", placeholder="Enter your key here...", type="password")

            input_image_component = gr.Image(type="pil", label="Input Image (auto-resized to target H/W)")
            prompt_input = gr.Textbox(label="Prompt", value=default_prompt_i2v)
            duration_seconds_input = gr.Slider(minimum=MIN_DURATION, maximum=MAX_DURATION, step=0.1, value=3.5, label="Duration (seconds)", info=f"Clamped to model's {MIN_FRAMES_MODEL}-{MAX_FRAMES_MODEL} frames at {FIXED_FPS}fps.")
            
            lora_selection_checkbox = gr.CheckboxGroup(
                choices=list(LORA_SETS.keys()),
                label="选择要应用的 LoRA (可多选)",
                info="选择一个或多个 LoRA 风格进行组合。"
            )
            
            with gr.Accordion("Advanced Settings", open=False):
                negative_prompt_input = gr.Textbox(label="Negative Prompt", value=default_negative_prompt, lines=3)
                seed_input = gr.Slider(label="Seed", minimum=0, maximum=MAX_SEED, step=1, value=42, interactive=True)
                randomize_seed_checkbox = gr.Checkbox(label="Randomize seed", value=True, interactive=True)
                steps_slider = gr.Slider(minimum=1, maximum=30, step=1, value=6, label="Inference Steps")
                guidance_scale_input = gr.Slider(minimum=0.0, maximum=10.0, step=0.5, value=1, label="Guidance Scale - high noise stage")
                guidance_scale_2_input = gr.Slider(minimum=0.0, maximum=10.0, step=0.5, value=1, label="Guidance Scale 2 - low noise stage")

            generate_button = gr.Button("Generate Video", variant="primary")
        with gr.Column():
            video_output = gr.Video(label="Generated Video", autoplay=True, interactive=False)

    ui_inputs = [
        secret_key_input,
        input_image_component, prompt_input, steps_slider,
        negative_prompt_input, duration_seconds_input,
        guidance_scale_input, guidance_scale_2_input, seed_input, randomize_seed_checkbox,
        lora_selection_checkbox
    ]
    generate_button.click(fn=generate_video, inputs=ui_inputs, outputs=[video_output, seed_input])

if __name__ == "__main__":
    demo.queue().launch(mcp_server=True)