app.py

import spaces
import torch

print(f'torch version:{torch.__version__}')

import huggingface_hub

print(f' huggingface_hub.__version__ {huggingface_hub.__version__}')

import functools
import gc
import os

os.environ['TORCH_CUDA_ARCH_LIST'] = '9.0'

import subprocess

import shutil
import sys
import tempfile
import time
from datetime import datetime
from pathlib import Path
import uuid

import cv2
import gradio as gr

from huggingface_hub import hf_hub_download
from PIL import Image

sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from src.misc.image_io import save_interpolated_video
from src.model.model.anysplat import AnySplat
from src.model.ply_export import export_ply
from src.utils.image import process_image

os.environ["ANYSPLAT_PROCESSED"] = f"{os.getcwd()}/proprocess_results"

from plyfile import PlyData
import numpy as np
import argparse
from io import BytesIO


def process_ply_to_splat(ply_file_path):
    plydata = PlyData.read(ply_file_path)
    vert = plydata["vertex"]
    sorted_indices = np.argsort(
        -np.exp(vert["scale_0"] + vert["scale_1"] + vert["scale_2"])
        / (1 + np.exp(-vert["opacity"]))
    )
    buffer = BytesIO()
    for idx in sorted_indices:
        v = plydata["vertex"][idx]
        position = np.array([v["x"], v["y"], v["z"]], dtype=np.float32)
        scales = np.exp(
            np.array(
                [v["scale_0"], v["scale_1"], v["scale_2"]],
                dtype=np.float32,
            )
        )
        rot = np.array(
            [v["rot_0"], v["rot_1"], v["rot_2"], v["rot_3"]],
            dtype=np.float32,
        )
        SH_C0 = 0.28209479177387814
        color = np.array(
            [
                0.5 + SH_C0 * v["f_dc_0"],
                0.5 + SH_C0 * v["f_dc_1"],
                0.5 + SH_C0 * v["f_dc_2"],
                1 / (1 + np.exp(-v["opacity"])),
            ]
        )
        buffer.write(position.tobytes())
        buffer.write(scales.tobytes())
        buffer.write((color * 255).clip(0, 255).astype(np.uint8).tobytes())
        buffer.write(
            ((rot / np.linalg.norm(rot)) * 128 + 128)
            .clip(0, 255)
            .astype(np.uint8)
            .tobytes()
        )

    return buffer.getvalue()

def save_splat_file(splat_data, output_path):
    with open(output_path, "wb") as f:
        f.write(splat_data)

def get_reconstructed_scene(outdir, image_files, model, device):

    images = [process_image(img_path) for img_path in image_files]
    images = torch.stack(images, dim=0).unsqueeze(0).to(device)  # [1, K, 3, 448, 448]
    b, v, c, h, w = images.shape

    assert c == 3, "Images must have 3 channels"

    gaussians, pred_context_pose = model.inference((images + 1) * 0.5)

    pred_all_extrinsic = pred_context_pose["extrinsic"]
    pred_all_intrinsic = pred_context_pose["intrinsic"]
    video, depth_colored = save_interpolated_video(
        pred_all_extrinsic,
        pred_all_intrinsic,
        b,
        h,
        w,
        gaussians,
        outdir,
        model.decoder,
    )
    plyfile = os.path.join(outdir, "gaussians.ply")
    # splatfile = os.path.join(outdir, "gaussians.splat")

    export_ply(
        gaussians.means[0],
        gaussians.scales[0],
        gaussians.rotations[0],
        gaussians.harmonics[0],
        gaussians.opacities[0],
        Path(plyfile),
        save_sh_dc_only=True,
    )
    # splat_data = process_ply_to_splat(plyfile)
    # save_splat_file(splat_data, splatfile)

    # Clean up
    torch.cuda.empty_cache()
    return plyfile, video, depth_colored

def extract_images(input_images, session_id):

    start_time = time.time()
    gc.collect()
    torch.cuda.empty_cache()

    base_dir = os.path.join(os.environ["ANYSPLAT_PROCESSED"], session_id)
    target_dir = base_dir
    target_dir_images = os.path.join(target_dir, "images")

    if os.path.exists(target_dir):
        shutil.rmtree(target_dir)
        
    os.makedirs(target_dir)
    os.makedirs(target_dir_images)

    image_paths = []

    if input_images is not None:
        for file_data in input_images:
            if isinstance(file_data, dict) and "name" in file_data:
                file_path = file_data["name"]
            else:
                file_path = file_data
            dst_path = os.path.join(target_dir_images, os.path.basename(file_path))
            shutil.copy(file_path, dst_path)
            image_paths.append(dst_path)

    end_time = time.time()
    print(
        f"Files copied to {target_dir_images}; took {end_time - start_time:.3f} seconds"
    )
    return target_dir, image_paths
    

def extract_frames(input_video, session_id):

    start_time = time.time()
    gc.collect()
    torch.cuda.empty_cache()

    base_dir = os.path.join(os.environ["ANYSPLAT_PROCESSED"], session_id)
    target_dir = base_dir
    target_dir_images = os.path.join(target_dir, "images")

    if os.path.exists(target_dir):
        shutil.rmtree(target_dir)
        
    os.makedirs(target_dir)
    os.makedirs(target_dir_images)

    image_paths = []

    if input_video is not None:
        if isinstance(input_video, dict) and "name" in input_video:
            video_path = input_video["name"]
        else:
            video_path = input_video

        vs = cv2.VideoCapture(video_path)
        fps = vs.get(cv2.CAP_PROP_FPS)
        frame_interval = int(fps * 1)  # 1 frame/sec

        count = 0
        video_frame_num = 0
        while True:
            gotit, frame = vs.read()
            if not gotit:
                break
            count += 1
            if count % frame_interval == 0:
                image_path = os.path.join(
                    target_dir_images, f"{video_frame_num:06}.png"
                )
                cv2.imwrite(image_path, frame)
                image_paths.append(image_path)
                video_frame_num += 1

    # Sort final images for gallery
    image_paths = sorted(image_paths)

    end_time = time.time()
    print(
        f"Files copied to {target_dir_images}; took {end_time - start_time:.3f} seconds"
    )
    return target_dir, image_paths


def update_gallery_on_video_upload(input_video, session_id):
    if not input_video:
        return None, None, None
        
    target_dir, image_paths = extract_frames(input_video, session_id)
    return None, target_dir, image_paths

def update_gallery_on_images_upload(input_images, session_id):

    if not input_images:
        return None, None, None
        
    target_dir, image_paths = extract_images(input_images, session_id)
    return None, target_dir, image_paths

@spaces.GPU()
def generate_splats_from_video(video_path, session_id=None):
    """
    Perform Gaussian Splatting from Unconstrained Views a Given Video, using a Feed-forward model.
    
    Args:
        video_path (str): Path to the input video file on disk.
    Returns:
        plyfile: Path to the reconstructed 3D object from the given video.
        rgb_vid: Path the the interpolated rgb video, increasing the frame rate using guassian splatting and interpolation of frames.
        depth_vid: Path the the interpolated depth video, increasing the frame rate using guassian splatting and interpolation of frames.
        image_paths: A list of paths from extracted frame from the video that is used for training Gaussian Splatting.
    """
    
    if session_id is None:
        session_id = uuid.uuid4().hex

    images_folder, image_paths = extract_frames(video_path, session_id)
    plyfile, rgb_vid, depth_vid = generate_splats_from_images(image_paths, session_id)

    return plyfile, rgb_vid, depth_vid, image_paths
    
@spaces.GPU()
def generate_splats_from_images(image_paths, session_id=None):
    """
    Perform Gaussian Splatting from Unconstrained Views a Given Images , using a Feed-forward model.
    
    Args:
        image_paths (str): Path to the input image files on disk.
    Returns:
        plyfile: Path to the reconstructed 3D object from the given image files.
        rgb_vid: Path the the interpolated rgb video, increasing the frame rate using guassian splatting and interpolation of frames.
        depth_vid: Path the the interpolated depth video, increasing the frame rate using guassian splatting and interpolation of frames.
    """
    processed_image_paths = []

    for file_data in image_paths:
        if isinstance(file_data, tuple):
            file_path, _ = file_data
            processed_image_paths.append(file_path)
        else:
            processed_image_paths.append(file_data)

    image_paths = processed_image_paths
    print(image_paths)

    if len(image_paths) == 1:
        image_paths.append(image_paths[0])

    if session_id is None:
        session_id = uuid.uuid4().hex
    
    start_time = time.time()
    gc.collect()
    torch.cuda.empty_cache()

    base_dir = os.path.join(os.environ["ANYSPLAT_PROCESSED"], session_id)

    print("Running run_model...")
    with torch.no_grad():
        plyfile, rgb_vid, depth_vid = get_reconstructed_scene(base_dir, image_paths, model, device)

    end_time = time.time()
    print(f"Total time: {end_time - start_time:.2f} seconds (including IO)")

    return plyfile, rgb_vid, depth_vid

def cleanup(request: gr.Request):

    sid = request.session_hash
    if sid:
        d1 = os.path.join(os.environ["ANYSPLAT_PROCESSED"], sid)
        shutil.rmtree(d1, ignore_errors=True)
        
def start_session(request: gr.Request):

    return request.session_hash


if __name__ == "__main__":
    share = True
    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
    
    # Load model
    model = AnySplat.from_pretrained(
        "lhjiang/anysplat"
    )
    model = model.to(device)
    model.eval()
    for param in model.parameters():
        param.requires_grad = False

    css = """
        #col-container {
            margin: 0 auto;
            max-width: 1024px;
        }
        """
    with gr.Blocks(css=css, title="AnySplat Demo") as demo:
        session_state = gr.State()
        demo.load(start_session, outputs=[session_state])
                
        target_dir_output = gr.Textbox(label="Target Dir", visible=False, value="None")
        is_example = gr.Textbox(label="is_example", visible=False, value="None")
        num_images = gr.Textbox(label="num_images", visible=False, value="None")
        dataset_name = gr.Textbox(label="dataset_name", visible=False, value="None")
        scene_name = gr.Textbox(label="scene_name", visible=False, value="None")
        image_type = gr.Textbox(label="image_type", visible=False, value="None")

        with gr.Column(elem_id="col-container"):

            gr.HTML(
                """
                <div style="text-align: center;">
                    <p style="font-size:16px; display: inline; margin: 0;">
                        <strong>AnySplat</strong> – Feed-forward 3D Gaussian Splatting from Unconstrained Views
                    </p>
                    <a href="https://github.com/OpenRobotLab/AnySplat" style="display: inline-block; vertical-align: middle; margin-left: 0.5em;">
                        <img src="https://img.shields.io/badge/GitHub-Repo-blue" alt="GitHub Repo">
                    </a>
                </div>
                """
            )
        
            with gr.Row():
                with gr.Column():

                    with gr.Tab("Video"):
                        input_video = gr.Video(label="Upload Video", sources=["upload"], interactive=True, height=512)
                    with gr.Tab("Images"):
                        input_images = gr.File(file_count="multiple", label="Upload Files", height=512)
                        
                    submit_btn = gr.Button(
                        "🖌️ Generate Gaussian Splat", scale=1, variant="primary"
                    )
        
                    image_gallery = gr.Gallery(
                        label="Preview",
                        columns=4,
                        height="300px",
                        show_download_button=True,
                        object_fit="contain",
                        preview=True,
                    )
    
                with gr.Column():
                    with gr.Column():
                        gr.HTML(
                            """
                            <p style="opacity: 0.6; font-style: italic;">
                              This might take a few seconds to load the 3D model
                            </p>
                            """
                        )
                        reconstruction_output = gr.Model3D(
                            label="Ply Gaussian Model",
                            height=512,
                            zoom_speed=0.5,
                            pan_speed=0.5,
                            # camera_position=[20, 20, 20],
                        )
                
                    with gr.Row():
                        rgb_video = gr.Video(
                            label="RGB Video", interactive=False, autoplay=True
                        )
                        depth_video = gr.Video(
                            label="Depth Video",
                            interactive=False,
                            autoplay=True,
                        )
                    with gr.Row():
                        examples = [
                            ["examples/video/re10k_1eca36ec55b88fe4.mp4"],
                            ["examples/video/spann3r.mp4"],
                            ["examples/video/bungeenerf_colosseum.mp4"],
                            ["examples/video/fox.mp4"],
                            ["examples/video/vrnerf_apartment.mp4"],
                            # [None, "examples/video/vrnerf_kitchen.mp4", "vrnerf", "kitchen", "17", "Real", "True",],
                            # [None, "examples/video/vrnerf_riverview.mp4", "vrnerf", "riverview", "12", "Real", "True",],
                            # [None, "examples/video/vrnerf_workshop.mp4", "vrnerf", "workshop", "32", "Real", "True",],
                            # [None, "examples/video/fillerbuster_ramen.mp4", "fillerbuster", "ramen", "32", "Real", "True",],
                            # [None, "examples/video/meganerf_rubble.mp4", "meganerf", "rubble", "10", "Real", "True",],
                            # [None, "examples/video/llff_horns.mp4", "llff", "horns", "12", "Real", "True",],
                            # [None, "examples/video/llff_fortress.mp4", "llff", "fortress", "7", "Real", "True",],
                            # [None, "examples/video/dtu_scan_106.mp4", "dtu", "scan_106", "20", "Real", "True",],
                            # [None, "examples/video/horizongs_hillside_summer.mp4", "horizongs", "hillside_summer", "55", "Synthetic", "True",],
                            # [None, "examples/video/kitti360.mp4", "kitti360", "kitti360", "64", "Real", "True",],
                        ]
                
                        gr.Examples(
                            examples=examples,
                            inputs=[
                                input_video
                            ],
                            outputs=[
                                reconstruction_output,
                                rgb_video,
                                depth_video,
                                image_gallery
                            ],
                            fn=generate_splats_from_video,
                            cache_examples=True,
                        )
                            
               
        submit_btn.click(
            fn=generate_splats_from_images,
            inputs=[image_gallery, session_state],
            outputs=[reconstruction_output, rgb_video, depth_video])

        input_video.upload(
            fn=update_gallery_on_video_upload,
            inputs=[input_video, session_state],
            outputs=[reconstruction_output, target_dir_output, image_gallery],
            show_api=False
        )

        input_images.upload(
            fn=update_gallery_on_images_upload,
            inputs=[input_images, session_state],
            outputs=[reconstruction_output, target_dir_output, image_gallery],
            show_api=False
        )

        demo.unload(cleanup)
        demo.queue()
        demo.launch(show_error=True, share=True, mcp_server=True)