engine/renderers/ffmpeg_compiler.py

import os
import subprocess
from pathlib import Path
import tempfile

class FFmpegCompiler:
    """
    Orchestrateur FFmpeg pour DarkMedia-X.
    Remplace les opérations lentes de MoviePy (Mixage Audio, Concatenation, VFX)
    par des appels C/C++ ultra-rapides accélérés matériellement.
    """
    
    @staticmethod
    def mix_audio_fast(voice_path: str, music_path: str, output_path: str, music_volume: float = 0.08):
        """
        Mixe la voix et la musique quasi-instantanément via FFmpeg 'amix'.
        """
        print(f"⚡ [FFmpeg] Mixage Audio Rapide: Voix + Musique...")
        
        # Filtre complexe: on baisse le volume de la musique et on mixe
        # amix: inputs=2 (voix, musique), duration=first (s'arrête quand la voix finit)
        filter_complex = f"[1:a]volume={music_volume}[music];[0:a][music]amix=inputs=2:duration=first:dropout_transition=2[outa]"
        
        cmd = [
            "ffmpeg", "-y", "-hide_banner", "-loglevel", "error",
            "-i", str(voice_path),
            "-i", str(music_path),
            "-filter_complex", filter_complex,
            "-map", "[outa]",
            "-acodec", "aac", "-b:a", "192k",
            str(output_path)
        ]
        
        try:
            subprocess.run(cmd, check=True)
            return True
        except subprocess.CalledProcessError as e:
            print(f"❌ [FFmpeg] Erreur de mixage audio: {e}")
            return False

    @staticmethod
    def apply_vfx_and_compress(input_video: str, output_path: str, vfx_type: str = "vhs"):
        """
        Applique un effet visuel (VFX) via les filtres natifs de FFmpeg.
        Utilise l'encodeur x264 pour une grande compatibilité.
        """
        print(f"⚡ [FFmpeg] Application du VFX Matériel : {vfx_type.upper()}...")
        
        filters = []
        
        if vfx_type == "vhs":
            # Effet VHS: décalage des canaux couleurs (chromatic aberration) et bruit
            filters.append("colorchannelmixer=rr=1:rb=0.2:gg=1:bb=1:br=0.2")
            filters.append("noise=alls=15:allf=t+u")
            filters.append("curves=r='0/0.1 1/0.9':g='0/0.1 1/0.9':b='0/0.2 1/1'")
            filters.append("eq=contrast=1.3:brightness=-0.05:saturation=0.8")
        elif vfx_type == "cctv":
            # Effet caméra de surveillance: Noir et blanc, contraste élevé, scanlines
            filters.append("hue=s=0") # Désaturation
            filters.append("eq=contrast=1.6:brightness=-0.1")
            filters.append("noise=alls=10:allf=t")
        elif vfx_type == "blood_lust":
            # Effet rouge sang
            filters.append("colorchannelmixer=rr=1.5:gg=0.5:bb=0.5")
            filters.append("eq=saturation=1.2:contrast=1.4:brightness=-0.05")
        else:
            # Base Horror Style (Remplace apply_horror_style de MoviePy)
            filters.append("eq=contrast=1.3:brightness=-0.05:saturation=0.85")
        
        # Filtre final (si vide, copie juste la vidéo)
        vf_string = ",".join(filters) if filters else "copy"
        
        cmd = [
            "ffmpeg", "-y", "-hide_banner", "-loglevel", "error",
            "-i", str(input_video)
        ]
        
        if filters:
            cmd.extend(["-vf", vf_string])
            
        cmd.extend([
            "-c:v", "libx264", "-preset", "fast", "-crf", "22",
            "-c:a", "copy", # On ne retouche pas l'audio
            str(output_path)
        ])
        
        try:
            subprocess.run(cmd, check=True)
            return True
        except subprocess.CalledProcessError as e:
            print(f"❌ [FFmpeg] Erreur d'application VFX: {e}")
            return False

    @staticmethod
    def concat_videos_fast(video_paths: list, output_path: str):
        """
        Concatène une liste de vidéos MP4 en utilisant le concat demuxer (ultra rapide, pas de ré-encodage complet).
        /!\ Nécessite que toutes les vidéos aient la même résolution, framerate et codecs.
        """
        if not video_paths:
            return False
            
        print(f"⚡ [FFmpeg] Concaténation Rapide de {len(video_paths)} clips...")
        
        with tempfile.NamedTemporaryFile(mode='w', delete=False, suffix='.txt') as f:
            for vp in video_paths:
                # Échapper les chemins pour FFmpeg
                safe_path = str(vp).replace('\\', '/').replace("'", r"'\''")
                f.write(f"file '{safe_path}'\n")
            list_path = f.name
            
        cmd = [
            "ffmpeg", "-y", "-hide_banner", "-loglevel", "error",
            "-f", "concat",
            "-safe", "0",
            "-i", list_path,
            "-c", "copy",
            str(output_path)
        ]
        
        try:
            subprocess.run(cmd, check=True)
            os.unlink(list_path)
            return True
        except subprocess.CalledProcessError as e:
            print(f"❌ [FFmpeg] Erreur de concaténation: {e}")
            os.unlink(list_path)
            return False

if __name__ == "__main__":
    # Tests unitaires basiques
    pass