app.py

import gradio as gr

import torch

import argparse
import pickle as pkl

import decord
from decord import VideoReader
import numpy as np
import yaml
import matplotlib.pyplot as plt
import matplotlib.patches as patches

from cover.datasets import UnifiedFrameSampler, spatial_temporal_view_decomposition
from cover.models import COVER

mean, std = (
    torch.FloatTensor([123.675, 116.28, 103.53]),
    torch.FloatTensor([58.395, 57.12, 57.375]),
)

mean_clip, std_clip = (
    torch.FloatTensor([122.77, 116.75, 104.09]),
    torch.FloatTensor([68.50, 66.63, 70.32])
)

sample_interval = 30

comparison_array = {
    "semantic": [3.0, 3.5, 2.5, 4.0, 2.0],  # 示例数组
    "technical": [2.0, 3.0, 3.5, 4.0, 1.5],
    "aesthetic": [2.5, 3.0, 2.0, 4.5, 3.5]
}

def get_sampler_params(video_path):
    vr = VideoReader(video_path)
    total_frames = len(vr)
    clip_len = (total_frames + sample_interval // 2) // sample_interval
    if clip_len == 0:
        clip_len = 1
    t_frag = clip_len
    
    return total_frames, clip_len, t_frag

def fuse_results(results: list):
    x = (results[0] + results[1] + results[2])
    return {
        "semantic" : results[0],
        "technical": results[1],
        "aesthetic": results[2],
        "overall"  : x,
    }

def normalize_score(score, min_score=0, max_score=5):
    return (score - min_score) / (max_score - min_score) * 5

def compare_score(score, score_list):
    better_than = sum(1 for s in score_list if score > s)
    percentage = better_than / len(score_list) * 100
    return f"Better than {percentage:.0f}% videos in YT-UGC" if percentage > 50 else f"Worse than {100-percentage:.0f}% videos in YT-UGC"

def create_bar_chart(scores, comparisons):
    labels = ['Semantic', 'Aesthetic', 'Technical', 'Overall']
    base_colors = ['#d62728', '#ff7f0e', '#1f77b4', '#bcbd22']
    
    fig, ax = plt.subplots(figsize=(10, 5))
    
    for i, (label, score, comparison, base_color) in enumerate(zip(labels, scores, comparisons, base_colors)):
        color = plt.cm.ScalarMappable(cmap=plt.cm.RdYlBu).to_rgba((score / 5))
        gradient = patches.Rectangle((0, i), 5, 1, color=base_color, alpha=0.5)
        ax.add_patch(gradient)
        
        # Add the actual score line
        ax.plot([score, score], [i, i+0.9], color='black', linewidth=2)
        
        ax.text(score + 0.1, i + 0.5, f'{score:.1f}', va='center', ha='left', color=base_color)
        ax.text(5.1, i + 0.5, comparison, va='center', ha='left', color=base_color)
    
    ax.set_yticks(range(len(labels)))
    ax.set_yticklabels(labels, color=base_colors)
    ax.set_xticks([0, 1, 2, 3, 4, 5])
    ax.set_xticklabels([0, 1, 2, 3, 4, 5])
    ax.set_xlim(0, 5)
    ax.set_xlabel('Score')
    
    plt.tight_layout()
    image_path = "./bar_chart.png"
    plt.savefig(image_path)
    plt.close()
    
    return image_path

def inference_one_video(input_video):
    """
    BASIC SETTINGS
    """
    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
    with open("./cover.yml", "r") as f:
        opt = yaml.safe_load(f)
    
    dopt = opt["data"]["val-ytugc"]["args"]
    temporal_samplers = {}
    
    # auto decision of parameters of sampler
    total_frames, clip_len, t_frag = get_sampler_params(input_video)
                    
    for stype, sopt in dopt["sample_types"].items():
        sopt["clip_len"] = clip_len
        sopt["t_frag"] = t_frag
        if stype == 'technical' or stype == 'aesthetic':
            if total_frames > 1:
                sopt["clip_len"] = clip_len * 2
            if stype == 'technical':
                sopt["aligned"] = sopt["clip_len"]
        temporal_samplers[stype] = UnifiedFrameSampler(
            sopt["clip_len"] // sopt["t_frag"],
            sopt["t_frag"],
            sopt["frame_interval"],
            sopt["num_clips"],
        )

    """
    LOAD MODEL
    """    
    evaluator = COVER(**opt["model"]["args"]).to(device)
    state_dict = torch.load(opt["test_load_path"], map_location=device)
    
    # set strict=False here to avoid error of missing
    # weight of prompt_learner in clip-iqa+, cross-gate
    evaluator.load_state_dict(state_dict['state_dict'], strict=False)

    """
    TESTING
    """
    views, _ = spatial_temporal_view_decomposition(
        input_video, dopt["sample_types"], temporal_samplers
    )

    for k, v in views.items():
        num_clips = dopt["sample_types"][k].get("num_clips", 1)
        if k == 'technical' or k == 'aesthetic':
            views[k] = (
                ((v.permute(1, 2, 3, 0) - mean) / std)
                .permute(3, 0, 1, 2)
                .reshape(v.shape[0], num_clips, -1, *v.shape[2:])
                .transpose(0, 1)
                .to(device)
            )
        elif k == 'semantic':
            views[k] = (
                ((v.permute(1, 2, 3, 0) - mean_clip) / std_clip)
                .permute(3, 0, 1, 2)
                .reshape(v.shape[0], num_clips, -1, *v.shape[2:])
                .transpose(0, 1)
                .to(device)
            )

    results = [r.mean().item() for r in evaluator(views)]
    pred_score = fuse_results(results)
    
    normalized_scores = [
        normalize_score(pred_score["semantic"]),
        normalize_score(pred_score["technical"]),
        normalize_score(pred_score["aesthetic"]),
        normalize_score(pred_score["overall"])
    ]
    
    comparisons = [
        compare_score(pred_score["semantic"], comparison_array["semantic"]),
        compare_score(pred_score["technical"], comparison_array["technical"]),
        compare_score(pred_score["aesthetic"], comparison_array["aesthetic"]),
        compare_score(pred_score["overall"], comparison_array["semantic"] + comparison_array["technical"] + comparison_array["aesthetic"])  # 假设 overall 分数的比较使用所有维度分数的组合
    ]
    
    image_path = create_bar_chart(normalized_scores, comparisons)
    return image_path

# Define the input and output types for Gradio using the new API
video_input = gr.Video(label="Input Video")
output_image = gr.Image(label="Scores")

# Create the Gradio interface
gradio_app = gr.Interface(fn=inference_one_video, inputs=video_input, outputs=output_image)

if __name__ == "__main__":
    gradio_app.launch()