main.py

from fastapi import FastAPI, HTTPException
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel, HttpUrl
from typing import List
import os
import asyncio
import uuid
import aiohttp
import re
from urllib.parse import urlparse
import shutil
import aiofiles

# Create FastAPI app
app = FastAPI()

# Create and mount staticfiles directory
os.makedirs("staticfiles", exist_ok=True)
app.mount("/static", StaticFiles(directory="staticfiles"), name="static")

# Define input model for the request
class SlideshowRequest(BaseModel):
    image_urls: List[HttpUrl]
    audio_url: HttpUrl
    duration: int
    zoom: bool = False

def extract_google_drive_id(url):
    """Extract file ID from a Google Drive URL"""
    pattern = r'(?:/file/d/|id=|/open\?id=)([^/&]+)'
    match = re.search(pattern, str(url))
    return match.group(1) if match else None

async def download_file(url, local_path):
    """Download a file from URL to local path asynchronously"""
    try:
        # Handle Google Drive URLs
        if "drive.google.com" in str(url):
            file_id = extract_google_drive_id(url)
            if file_id:
                url = f"https://drive.google.com/uc?export=download&id={file_id}"
        
        async with aiohttp.ClientSession() as session:
            async with session.get(str(url)) as response:
                response.raise_for_status()
                
                async with aiofiles.open(local_path, 'wb') as f:
                    while True:
                        chunk = await response.content.read(8192)
                        if not chunk:
                            break
                        await f.write(chunk)
        return True
    except Exception as e:
        print(f"Error downloading {url}: {str(e)}")
        return False

async def create_slideshow(image_paths, audio_path, output_path, duration, zoom=False, zoom_ratio=0.04):
    """Generate slideshow from images and audio using ffmpeg asynchronously, with optional zoom effect"""
    if not zoom:
        # Create temporary file list for ffmpeg concat
        concat_file = "temp_concat.txt"
        async with aiofiles.open(concat_file, "w") as f:
            for img in image_paths:
                await f.write(f"file '{img}'\n")
                await f.write(f"duration {duration}\n")
            # Add the last image again without duration (required by ffmpeg)
            if image_paths:
                await f.write(f"file '{image_paths[-1]}'\n")
        
        # Run ffmpeg command to create slideshow with audio (no zoom)
        total_duration = len(image_paths) * duration
        cmd = [
            "ffmpeg",
            "-f", "concat",
            "-safe", "0",
            "-i", concat_file,
            "-i", audio_path,
            "-c:v", "libx264",
            "-pix_fmt", "yuv420p",
            "-c:a", "aac",
            "-shortest",
            "-y",
            "-t", str(total_duration),
            output_path
        ]
    else:
        # Generate slideshow with zoom effect using ffmpeg zoompan filter.
        # For each image, loop it for the specified duration and apply zoompan.
        fps = 25  # frames per second
        cmd = ["ffmpeg"]
        # Add each image as an input that loops for 'duration' seconds.
        for img in image_paths:
            cmd.extend(["-loop", "1", "-t", str(duration), "-i", img])
        # Append the audio input. Its index will be len(image_paths)
        cmd.extend(["-i", audio_path])
        
        # Build filter_complex for zoompan on each image.
        filter_complex = ""
        for i in range(len(image_paths)):
            # Each input's video stream is processed with zoompan.
            # The zoom increases by zoom_ratio per frame (starting at 1.0) and centers the image.
            filter_complex += (
                f"[{i}:v]zoompan=z='if(eq(on,0),1,zoom+{zoom_ratio})':x='iw/2-(iw/zoom)/2':y='ih/2-(ih/zoom)/2':"
                f"d={duration*fps}:s=hd720, setpts=PTS-STARTPTS[v{i}];"
            )
        # Concatenate all processed video segments.
        inputs = "".join(f"[v{i}]" for i in range(len(image_paths)))
        filter_complex += f"{inputs}concat=n={len(image_paths)}:v=1:a=0,format=yuv420p[v]"
        
        # Map the concatenated video and the audio stream (audio input is at index len(image_paths))
        cmd = cmd + [
            "-filter_complex", filter_complex,
            "-map", "[v]",
            "-map", f"{len(image_paths)}:a",
            "-c:v", "libx264",
            "-pix_fmt", "yuv420p",
            "-c:a", "aac",
            "-shortest",
            "-y",
            output_path
        ]
    
    try:
        process = await asyncio.create_subprocess_exec(
            *cmd, 
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        _, stderr = await process.communicate()
        
        # Remove temporary concat file if it exists
        if not zoom and os.path.exists("temp_concat.txt"):
            os.remove("temp_concat.txt")
            
        if process.returncode != 0:
            print(f"FFmpeg error: {stderr.decode()}")
            return False
        return True
    except Exception as e:
        print(f"FFmpeg error: {str(e)}")
        if not zoom and os.path.exists("temp_concat.txt"):
            os.remove("temp_concat.txt")
        return False

@app.post("/make_slideshow")
async def make_slideshow(request: SlideshowRequest):
    """
    Create a slideshow from images and audio with specified duration per image.
    Returns the URL of the generated video.
    """
    # Create unique directory for this request
    request_id = str(uuid.uuid4())
    request_dir = os.path.join("staticfiles", request_id)
    os.makedirs(request_dir, exist_ok=True)
    
    try:
        # Download images
        image_paths = []
        download_tasks = []
        
        for i, url in enumerate(request.image_urls):
            image_path = os.path.join(request_dir, f"image_{i:03d}.png")
            image_paths.append(image_path)
            download_tasks.append(download_file(url, image_path))
        
        # Download audio
        audio_path = os.path.join(request_dir, "audio.mp3")
        download_tasks.append(download_file(request.audio_url, audio_path))
        
        # Wait for all downloads to complete
        results = await asyncio.gather(*download_tasks)
        
        # Check if all downloads were successful
        if not all(results[:-1]):  # All image downloads
            raise HTTPException(status_code=400, detail="Failed to download one or more images")
        
        if not results[-1]:  # Audio download
            raise HTTPException(status_code=400, detail=f"Failed to download audio: {request.audio_url}")
        
        # Output video path
        output_path = os.path.join(request_dir, "slideshow.mp4")
        
        # Generate slideshow
        if not await create_slideshow(image_paths, audio_path, output_path, request.duration, request.zoom):
            raise HTTPException(status_code=500, detail="Failed to create slideshow")
        
        # Return URL to the video
        base_url = "https://saq1b-api.hf.space/static"
        video_url = f"{base_url}/{request_id}/slideshow.mp4"
        return {"url": video_url}
    
    except Exception as e:
        # Clean up on error
        if os.path.exists(request_dir):
            shutil.rmtree(request_dir)
        raise HTTPException(status_code=500, detail=f"Error: {str(e)}")

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)