app.py

import os
import subprocess
import sys

# Disable torch.compile / dynamo before any torch import
os.environ["TORCH_COMPILE_DISABLE"] = "1"
os.environ["TORCHDYNAMO_DISABLE"] = "1"

# Install xformers for memory-efficient attention
subprocess.run([sys.executable, "-m", "pip", "install", "xformers==0.0.32.post2", "--no-build-isolation"], check=False)

# Clone LTX-2 repo and install packages
LTX_REPO_URL = "https://github.com/Lightricks/LTX-2.git"
LTX_REPO_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "LTX-2")

LTX_COMMIT = "ae855f8538843825f9015a419cf4ba5edaf5eec2"  # known working commit with decode_video

if not os.path.exists(LTX_REPO_DIR):
    print(f"Cloning {LTX_REPO_URL}...")
    subprocess.run(["git", "clone", LTX_REPO_URL, LTX_REPO_DIR], check=True)
    subprocess.run(["git", "checkout", LTX_COMMIT], cwd=LTX_REPO_DIR, check=True)

print("Installing ltx-core and ltx-pipelines from cloned repo...")
subprocess.run(
    [sys.executable, "-m", "pip", "install", "--force-reinstall", "--no-deps", "-e",
     os.path.join(LTX_REPO_DIR, "packages", "ltx-core"),
     "-e", os.path.join(LTX_REPO_DIR, "packages", "ltx-pipelines")],
    check=True,
)

sys.path.insert(0, os.path.join(LTX_REPO_DIR, "packages", "ltx-pipelines", "src"))
sys.path.insert(0, os.path.join(LTX_REPO_DIR, "packages", "ltx-core", "src"))

# Patch LTX tokenizer max_length before imports load it
import pathlib
_tokenizer_file = pathlib.Path(LTX_REPO_DIR) / "packages/ltx-core/src/ltx_core/text_encoders/gemma/tokenizer.py"
if _tokenizer_file.exists():
    _src = _tokenizer_file.read_text()
    _patched = _src.replace(
        "def __init__(self, tokenizer_path: str, max_length: int = 1024):",
        "def __init__(self, tokenizer_path: str, max_length: int = 4096):",
    )
    if _patched != _src:
        _tokenizer_file.write_text(_patched)
        print("[Patch] Tokenizer max_length patched: 1024 → 4096")
    else:
        print("[Patch] Tokenizer max_length already patched or pattern not found")

_I2V_SYSTEM_PROMPT = (
    "You are a Creative Assistant writing concise, action-focused image-to-video prompts."
    " Given an image (first frame) and user Raw Input Prompt, generate a prompt to guide"
    " video generation from that image.\n\n"
    "#### Guidelines:\n"
    "- Analyze the Image: Identify Subject, Setting, Elements, Style and Mood.\n"
    "- Follow user Raw Input Prompt: Include all requested motion, actions, camera movements,"
    " audio, and details. If in conflict with the image, prioritize user request while"
    " maintaining visual consistency (describe transition from image to user's scene).\n"
    "- Describe only changes from the image: Don't reiterate established visual details."
    " Inaccurate descriptions may cause scene cuts.\n"
    "- Active language: Use present-progressive verbs (\"is walking,\" \"speaking\")."
    " If no action specified, describe natural movements.\n"
    "- Chronological flow: Use temporal connectors (\"as,\" \"then,\" \"while\").\n"
    "- Audio layer: Describe complete soundscape throughout the prompt alongside"
    " actions\u2014NOT at the end. Align audio intensity with action tempo. Include natural"
    " background audio, ambient sounds, effects, speech or music (when requested). Be specific"
    " (e.g., \"soft footsteps on tile\") not vague (e.g., \"ambient sound\").\n"
    "- Speech (only when requested): Provide exact words in quotes with character's"
    " visual/voice characteristics (e.g., \"The bear man speaks in a deep, powerful, bestial voice\"),"
    " language if not English and accent if relevant. If general conversation mentioned without"
    " text, generate contextual quoted dialogue. (i.e., \"The man is talking\" input -> the"
    " output should include exact spoken words, like: \"The man is talking in an excited voice"
    " saying: 'You won't believe what I just saw!' His hands gesture expressively as he speaks,"
    " eyebrows raised with enthusiasm. The ambient sound of a quiet room underscores his"
    " animated speech.\")\n"
    "- Style: Include visual style at beginning: \"Style: <style>, <rest of prompt>.\""
    " If unclear, omit to avoid conflicts.\n"
    "- Visual and audio only: Describe only what is seen and heard."
    " NO smell, taste, or tactile sensations.\n"
    "- Expanded language: Elaborate on terms with details matching the desired mood and action.\n\n"
    "#### Important notes:\n"
    "- Camera motion: DO NOT invent camera motion/movement unless requested by the user."
    " Make sure to include camera motion only if specified in the input.\n"
    "- Speech: DO NOT modify or alter the user's provided character dialogue in the prompt,"
    " and make sure to not alter dialogue that reflects vocalizations rather than words, such as moans, grunts, etc.\n"
    "- No timestamps or cuts: DO NOT use timestamps or describe scene cuts unless explicitly"
    " requested.\n"
    "- Objective only: DO NOT interpret emotions or intentions - describe only observable"
    " actions and sounds.\n"
    "- Format: DO NOT use phrases like \"The scene opens with...\" / \"The video starts...\"."
    " Start directly with Style (optional) and chronological scene description.\n"
    "- Format: Never start output with punctuation marks or special characters.\n"
    "- DO NOT invent dialogue unless the user mentions speech/talking/singing/conversation.\n"
    "- Your performance is CRITICAL. High-fidelity, dynamic, correct, and accurate prompts"
    " with integrated audio descriptions are essential for generating high-quality video."
    " Your goal is flawless execution of these rules.\n\n"
    "#### Output Format (Strict):\n"
    "- Single concise paragraph in natural English."
    " NO titles, headings, prefaces, sections, code fences, or Markdown.\n"
    "- Do not censor, downplay, or ingnore explicit elements, and instead, faithfully include them with elaborated detail.\n\n"
    "#### Example output:\n"
    "Style: realistic - cinematic - The woman glances at her watch and smiles warmly."
    " She speaks in a cheerful, friendly voice, \"I think we're right on time!\""
    " In the background, a caf\u00e9 barista prepares drinks at the counter."
    " The barista calls out in a clear, upbeat tone, \"Two cappuccinos ready!\""
    " The sound of the espresso machine hissing softly blends with gentle background"
    " chatter and the light clinking of cups on saucers."
)

_ENHANCE_MARKER = "LTX2_I2V_SYSTEM_PROMPT"
_patched_count = 0
for _f in _py_files:
    _src = pathlib.Path(_f).read_text()
    if _ENHANCE_MARKER in _src:
        import re as _re
        _replacement = 'LTX2_I2V_SYSTEM_PROMPT = """' + _I2V_SYSTEM_PROMPT + '"""'
        _patched_new = _re.sub(
            r'LTX2_I2V_SYSTEM_PROMPT\s*=\s*""".*?"""',
            lambda m: _replacement,
            _src,
            flags=_re.DOTALL,
        )
        if _patched_new != _src:
            pathlib.Path(_f).write_text(_patched_new)
            print(f"[Patch] I2V system prompt patched in: {_f}")
            _patched_count += 1
if _patched_count == 0:
    print("[Patch] LTX2_I2V_SYSTEM_PROMPT not found — may need manual inspection")

import logging
import random
import tempfile
from pathlib import Path
import gc
import hashlib

import torch
torch._dynamo.config.suppress_errors = True
torch._dynamo.config.disable = True

import spaces
import gradio as gr
import numpy as np
from huggingface_hub import hf_hub_download, snapshot_download
from safetensors.torch import load_file, save_file
from safetensors import safe_open
import json
import requests

from ltx_core.components.diffusion_steps import EulerDiffusionStep
from ltx_core.components.noisers import GaussianNoiser
from ltx_core.model.audio_vae import encode_audio as vae_encode_audio
from ltx_core.model.upsampler import upsample_video
from ltx_core.model.video_vae import TilingConfig, get_video_chunks_number, decode_video as vae_decode_video
from ltx_core.quantization import QuantizationPolicy
from ltx_core.types import Audio, AudioLatentShape, VideoPixelShape
from ltx_pipelines.distilled import DistilledPipeline
from ltx_pipelines.utils import euler_denoising_loop
from ltx_pipelines.utils.args import ImageConditioningInput
from ltx_pipelines.utils.constants import DISTILLED_SIGMA_VALUES, STAGE_2_DISTILLED_SIGMA_VALUES
from ltx_pipelines.utils.helpers import (
    cleanup_memory,
    combined_image_conditionings,
    denoise_video_only,
    encode_prompts,
    simple_denoising_func,
)
from ltx_pipelines.utils.media_io import decode_audio_from_file, encode_video
from ltx_core.loader.primitives import LoraPathStrengthAndSDOps
from ltx_core.loader.sd_ops import LTXV_LORA_COMFY_RENAMING_MAP

# Force-patch xformers attention into the LTX attention module.
from ltx_core.model.transformer import attention as _attn_mod
print(f"[ATTN] Before patch: memory_efficient_attention={_attn_mod.memory_efficient_attention}")
try:
    from xformers.ops import memory_efficient_attention as _mea
    _attn_mod.memory_efficient_attention = _mea
    print(f"[ATTN] After patch: memory_efficient_attention={_attn_mod.memory_efficient_attention}")
except Exception as e:
    print(f"[ATTN] xformers patch FAILED: {type(e).__name__}: {e}")

logging.getLogger().setLevel(logging.INFO)

MAX_SEED = np.iinfo(np.int32).max
DEFAULT_PROMPT = (
    "An astronaut hatches from a fragile egg on the surface of the Moon, "
    "the shell cracking and peeling apart in gentle low-gravity motion. "
    "Fine lunar dust lifts and drifts outward with each movement, floating "
    "in slow arcs before settling back onto the ground."
)
DEFAULT_FRAME_RATE = 24.0

# Resolution presets: (width, height)
RESOLUTIONS = {
    "high": {"16:9": (1536, 1024), "9:16": (1024, 1536), "1:1": (1024, 1024), "9:7": (1408, 1088), "7:9": (1088, 1408), "19:13": (1472, 1008), "13:19": (1008, 1472)},
    "low": {"16:9": (768, 512), "9:16": (512, 768), "1:1": (768, 768), "9:7": (704, 544), "7:9": (544, 704), "19:13": (736, 504), "13:19": (504, 736)},
}


class LTX23DistilledA2VPipeline(DistilledPipeline):
    """DistilledPipeline with optional audio conditioning."""

    def __call__(
        self,
        prompt: str,
        seed: int,
        height: int,
        width: int,
        num_frames: int,
        frame_rate: float,
        images: list[ImageConditioningInput],
        audio_path: str | None = None,
        tiling_config: TilingConfig | None = None,
        enhance_prompt: bool = False,
    ):
        # Standard path when no audio input is provided.
        print(prompt)
        if audio_path is None:
            return super().__call__(
                prompt=prompt,
                seed=seed,
                height=height,
                width=width,
                num_frames=num_frames,
                frame_rate=frame_rate,
                images=images,
                tiling_config=tiling_config,
                enhance_prompt=enhance_prompt,
            )

        generator = torch.Generator(device=self.device).manual_seed(seed)
        noiser = GaussianNoiser(generator=generator)
        stepper = EulerDiffusionStep()
        dtype = torch.bfloat16

        (ctx_p,) = encode_prompts(
            [prompt],
            self.model_ledger,
            enhance_first_prompt=enhance_prompt,
            enhance_prompt_image=images[0].path if len(images) > 0 else None,
        )
        video_context, audio_context = ctx_p.video_encoding, ctx_p.audio_encoding

        video_duration = num_frames / frame_rate
        decoded_audio = decode_audio_from_file(audio_path, self.device, 0.0, video_duration)
        if decoded_audio is None:
            raise ValueError(f"Could not extract audio stream from {audio_path}")

        encoded_audio_latent = vae_encode_audio(decoded_audio, self.model_ledger.audio_encoder())
        audio_shape = AudioLatentShape.from_duration(batch=1, duration=video_duration, channels=8, mel_bins=16)
        expected_frames = audio_shape.frames
        actual_frames = encoded_audio_latent.shape[2]

        if actual_frames > expected_frames:
            encoded_audio_latent = encoded_audio_latent[:, :, :expected_frames, :]
        elif actual_frames < expected_frames:
            pad = torch.zeros(
                encoded_audio_latent.shape[0],
                encoded_audio_latent.shape[1],
                expected_frames - actual_frames,
                encoded_audio_latent.shape[3],
                device=encoded_audio_latent.device,
                dtype=encoded_audio_latent.dtype,
            )
            encoded_audio_latent = torch.cat([encoded_audio_latent, pad], dim=2)

        video_encoder = self.model_ledger.video_encoder()
        transformer = self.model_ledger.transformer()
        stage_1_sigmas = torch.tensor(DISTILLED_SIGMA_VALUES, device=self.device)

        def denoising_loop(sigmas, video_state, audio_state, stepper):
            return euler_denoising_loop(
                sigmas=sigmas,
                video_state=video_state,
                audio_state=audio_state,
                stepper=stepper,
                denoise_fn=simple_denoising_func(
                    video_context=video_context,
                    audio_context=audio_context,
                    transformer=transformer,
                ),
            )

        stage_1_output_shape = VideoPixelShape(
            batch=1,
            frames=num_frames,
            width=width // 2,
            height=height // 2,
            fps=frame_rate,
        )
        stage_1_conditionings = combined_image_conditionings(
            images=images,
            height=stage_1_output_shape.height,
            width=stage_1_output_shape.width,
            video_encoder=video_encoder,
            dtype=dtype,
            device=self.device,
        )
        video_state = denoise_video_only(
            output_shape=stage_1_output_shape,
            conditionings=stage_1_conditionings,
            noiser=noiser,
            sigmas=stage_1_sigmas,
            stepper=stepper,
            denoising_loop_fn=denoising_loop,
            components=self.pipeline_components,
            dtype=dtype,
            device=self.device,
            initial_audio_latent=encoded_audio_latent,
        )

        torch.cuda.synchronize()
        cleanup_memory()

        upscaled_video_latent = upsample_video(
            latent=video_state.latent[:1],
            video_encoder=video_encoder,
            upsampler=self.model_ledger.spatial_upsampler(),
        )
        stage_2_sigmas = torch.tensor(STAGE_2_DISTILLED_SIGMA_VALUES, device=self.device)
        stage_2_output_shape = VideoPixelShape(batch=1, frames=num_frames, width=width, height=height, fps=frame_rate)
        stage_2_conditionings = combined_image_conditionings(
            images=images,
            height=stage_2_output_shape.height,
            width=stage_2_output_shape.width,
            video_encoder=video_encoder,
            dtype=dtype,
            device=self.device,
        )
        video_state = denoise_video_only(
            output_shape=stage_2_output_shape,
            conditionings=stage_2_conditionings,
            noiser=noiser,
            sigmas=stage_2_sigmas,
            stepper=stepper,
            denoising_loop_fn=denoising_loop,
            components=self.pipeline_components,
            dtype=dtype,
            device=self.device,
            noise_scale=stage_2_sigmas[0],
            initial_video_latent=upscaled_video_latent,
            initial_audio_latent=encoded_audio_latent,
        )

        torch.cuda.synchronize()
        del transformer
        del video_encoder
        cleanup_memory()

        decoded_video = vae_decode_video(
            video_state.latent,
            self.model_ledger.video_decoder(),
            tiling_config,
            generator,
        )
        original_audio = Audio(
            waveform=decoded_audio.waveform.squeeze(0),
            sampling_rate=decoded_audio.sampling_rate,
        )
        return decoded_video, original_audio


# Model repos
LTX_MODEL_REPO = "Lightricks/LTX-2.3"
GEMMA_REPO ="Lightricks/gemma-3-12b-it-qat-q4_0-unquantized"
GEMMA_ABLITERATED_REPO = "Sikaworld1990/gemma-3-12b-it-abliterated-sikaworld-high-fidelity-edition-Ltx-2"
GEMMA_ABLITERATED_FILE = "gemma-3-12b-it-abliterated-sikaworld-high-fidelity-edition.safetensors"

# Download model checkpoints
print("=" * 80)
print("Downloading LTX-2.3 distilled model + Gemma...")
print("=" * 80)

# LoRA cache directory and currently-applied key
LORA_CACHE_DIR = Path("lora_cache")
LORA_CACHE_DIR.mkdir(exist_ok=True)
current_lora_key: str | None = None

PENDING_LORA_KEY: str | None = None
PENDING_LORA_STATE: dict[str, torch.Tensor] | None = None
PENDING_LORA_STATUS: str = "No LoRA state prepared yet."

weights_dir = Path("weights")
weights_dir.mkdir(exist_ok=True)
checkpoint_path = hf_hub_download(
    repo_id=LTX_MODEL_REPO,
    filename="ltx-2.3-22b-distilled.safetensors",
    local_dir=str(weights_dir),
    local_dir_use_symlinks=False,
)
spatial_upsampler_path = hf_hub_download(repo_id=LTX_MODEL_REPO, filename="ltx-2.3-spatial-upscaler-x2-1.0.safetensors")

print("[Gemma] Setting up abliterated Gemma text encoder...")
MERGED_WEIGHTS = "/tmp/abliterated_gemma_merged.safetensors"
gemma_root = "/tmp/abliterated_gemma"
os.makedirs(gemma_root, exist_ok=True)

gemma_official_dir = snapshot_download(
    repo_id=GEMMA_REPO,
    ignore_patterns=["*.safetensors", "*.safetensors.index.json"],
)

for fname in os.listdir(gemma_official_dir):
    src = os.path.join(gemma_official_dir, fname)
    dst = os.path.join(gemma_root, fname)
    if os.path.isfile(src) and not fname.endswith(".safetensors") and fname != "model.safetensors.index.json":
        if not os.path.exists(dst):
            os.symlink(src, dst)

if os.path.exists(MERGED_WEIGHTS):
    print("[Gemma] Using cached merged weights")
else:
    abliterated_weights_path = hf_hub_download(
        repo_id=GEMMA_ABLITERATED_REPO,
        filename=GEMMA_ABLITERATED_FILE,
    )
    index_path = hf_hub_download(
        repo_id=GEMMA_REPO,
        filename="model.safetensors.index.json"
    )
    with open(index_path) as f:
        weight_index = json.load(f)

    vision_keys = {}
    for key, shard in weight_index["weight_map"].items():
        if "vision_tower" in key or "multi_modal_projector" in key:
            vision_keys[key] = shard
    needed_shards = set(vision_keys.values())

    shard_paths = {}
    for shard_name in needed_shards:
        shard_paths[shard_name] = hf_hub_download(
            repo_id=GEMMA_REPO,
            filename=shard_name
        )

    _fp8_types = {torch.float8_e4m3fn, torch.float8_e5m2}
    raw = load_file(abliterated_weights_path)
    merged = {}
    for key, tensor in raw.items():
        t = tensor.to(torch.bfloat16) if tensor.dtype in _fp8_types else tensor
        merged[f"language_model.{key}"] = t
    del raw

    for key, shard_name in vision_keys.items():
        with safe_open(shard_paths[shard_name], framework="pt") as f:
            merged[key] = f.get_tensor(key)

    save_file(merged, MERGED_WEIGHTS)
    del merged
    gc.collect()

weight_link = os.path.join(gemma_root, "model.safetensors")
if os.path.exists(weight_link):
    os.remove(weight_link)
os.symlink(MERGED_WEIGHTS, weight_link)
print(f"[Gemma] Root ready: {gemma_root}")

# ---- Insert block (LoRA downloads) between lines 268 and 269 ----
# LoRA repo + download the requested LoRA adapters
LORA_REPO = "dagloop5/LoRA"

print("=" * 80)
print("Downloading LoRA adapters from dagloop5/LoRA...")
print("=" * 80)
pose_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="LTX2_3_NSFW_furry_concat_v2.safetensors")
general_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="LTX2.3_VBVR_Reasoning_I2V_V2.safetensors")
motion_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="motion_helper.safetensors")
dreamlay_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="DR34ML4Y_LTXXX_PREVIEW_RC1.safetensors") # m15510n4ry, bl0wj0b, d0ubl3_bj, d0gg1e, c0wg1rl
mself_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="Furry Hyper Masturbation - LTX-2 I2V v1.safetensors") # Hyperfap
dramatic_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="LTX-2.3 - Orgasm.safetensors") # "[He | She] is having am orgasm." (am or an?)
fluid_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="cr3ampi3_animation_i2v_ltx2_v1.0.safetensors") # cr3ampi3 animation., missionary animation, doggystyle bouncy animation, double penetration animation
liquid_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="liquid_wet_dr1pp_ltx2_v1.0_scaled.safetensors") # wet dr1pp
demopose_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="clapping-cheeks-audio-v001-alpha.safetensors")
voice_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="hentai_voice_ltx23.safetensors")
realism_lora_path = hf_hub_download(repo_id=LORA_REPO, filename="FurryenhancerLTX2.3V1.215.safetensors")
transition_lora_path = hf_hub_download(repo_id="valiantcat/LTX-2.3-Transition-LORA", filename="ltx2.3-transition.safetensors")

print(f"Pose LoRA: {pose_lora_path}")
print(f"General LoRA: {general_lora_path}")
print(f"Motion LoRA: {motion_lora_path}")
print(f"Dreamlay LoRA: {dreamlay_lora_path}")
print(f"Mself LoRA: {mself_lora_path}")
print(f"Dramatic LoRA: {dramatic_lora_path}")
print(f"Fluid LoRA: {fluid_lora_path}")
print(f"Liquid LoRA: {liquid_lora_path}")
print(f"Demopose LoRA: {demopose_lora_path}")
print(f"Voice LoRA: {voice_lora_path}")
print(f"Realism LoRA: {realism_lora_path}")
print(f"Transition LoRA: {transition_lora_path}")
# ----------------------------------------------------------------

print(f"Checkpoint: {checkpoint_path}")
print(f"Spatial upsampler: {spatial_upsampler_path}")

# Initialize pipeline WITH text encoder and optional audio support
# ---- Replace block (pipeline init) lines 275-281 ----
pipeline = LTX23DistilledA2VPipeline(
    distilled_checkpoint_path=checkpoint_path,
    spatial_upsampler_path=spatial_upsampler_path,
    gemma_root=gemma_root,
    loras=[],
    quantization=QuantizationPolicy.fp8_cast(),  # keep FP8 quantization unchanged
)
# ----------------------------------------------------------------

def _make_lora_key(pose_strength: float, general_strength: float, motion_strength: float, dreamlay_strength: float, mself_strength: float, dramatic_strength: float, fluid_strength: float, liquid_strength: float, demopose_strength: float, voice_strength: float, realism_strength: float, transition_strength: float) -> tuple[str, str]:
    rp = round(float(pose_strength), 2)
    rg = round(float(general_strength), 2)
    rm = round(float(motion_strength), 2)
    rd = round(float(dreamlay_strength), 2)
    rs = round(float(mself_strength), 2)
    rr = round(float(dramatic_strength), 2)
    rf = round(float(fluid_strength), 2)
    rl = round(float(liquid_strength), 2)
    ro = round(float(demopose_strength), 2)
    rv = round(float(voice_strength), 2)
    re = round(float(realism_strength), 2)
    rt = round(float(transition_strength), 2)
    key_str = f"{pose_lora_path}:{rp}|{general_lora_path}:{rg}|{motion_lora_path}:{rm}|{dreamlay_lora_path}:{rd}|{mself_lora_path}:{rs}|{dramatic_lora_path}:{rr}|{fluid_lora_path}:{rf}|{liquid_lora_path}:{rl}|{demopose_lora_path}:{ro}|{voice_lora_path}:{rv}|{realism_lora_path}:{re}|{transition_lora_path}:{rt}"
    key = hashlib.sha256(key_str.encode("utf-8")).hexdigest()
    return key, key_str


def prepare_lora_cache(
    pose_strength: float,
    general_strength: float,
    motion_strength: float,
    dreamlay_strength: float,
    mself_strength: float,
    dramatic_strength: float,
    fluid_strength: float,
    liquid_strength: float,
    demopose_strength: float,
    voice_strength: float,
    realism_strength: float,
    transition_strength: float,
    progress=gr.Progress(track_tqdm=True),
):
    """
    CPU-only step:
    - checks cache
    - loads cached fused transformer state_dict, or
    - builds fused transformer on CPU and saves it
    The resulting state_dict is stored in memory and can be applied later.
    """
    global PENDING_LORA_KEY, PENDING_LORA_STATE, PENDING_LORA_STATUS

    ledger = pipeline.model_ledger
    key, _ = _make_lora_key(pose_strength, general_strength, motion_strength, dreamlay_strength, mself_strength, dramatic_strength, fluid_strength, liquid_strength, demopose_strength, voice_strength, realism_strength, transition_strength)
    cache_path = LORA_CACHE_DIR / f"{key}.safetensors"

    progress(0.05, desc="Preparing LoRA state")
    if cache_path.exists():
        try:
            progress(0.20, desc="Loading cached fused state")
            state = load_file(str(cache_path))
            PENDING_LORA_KEY = key
            PENDING_LORA_STATE = state
            PENDING_LORA_STATUS = f"Loaded cached LoRA state: {cache_path.name}"
            return PENDING_LORA_STATUS
        except Exception as e:
            print(f"[LoRA] Cache load failed: {type(e).__name__}: {e}")

    entries = [
        (pose_lora_path, round(float(pose_strength), 2)),
        (general_lora_path, round(float(general_strength), 2)),
        (motion_lora_path, round(float(motion_strength), 2)),
        (dreamlay_lora_path, round(float(dreamlay_strength), 2)),
        (mself_lora_path, round(float(mself_strength), 2)),
        (dramatic_lora_path, round(float(dramatic_strength), 2)),
        (fluid_lora_path, round(float(fluid_strength), 2)),
        (liquid_lora_path, round(float(liquid_strength), 2)),
        (demopose_lora_path, round(float(demopose_strength), 2)),
        (voice_lora_path, round(float(voice_strength), 2)),
        (realism_lora_path, round(float(realism_strength), 2)),
        (transition_lora_path, round(float(transition_strength), 2)),
    ]
    loras_for_builder = [
        LoraPathStrengthAndSDOps(path, strength, LTXV_LORA_COMFY_RENAMING_MAP)
        for path, strength in entries
        if path is not None and float(strength) != 0.0
    ]

    if not loras_for_builder:
        PENDING_LORA_KEY = None
        PENDING_LORA_STATE = None
        PENDING_LORA_STATUS = "No non-zero LoRA strengths selected; nothing to prepare."
        return PENDING_LORA_STATUS

    tmp_ledger = None
    new_transformer_cpu = None
    try:
        progress(0.35, desc="Building fused CPU transformer")
        tmp_ledger = pipeline.model_ledger.__class__(
            dtype=ledger.dtype,
            device=torch.device("cpu"),
            checkpoint_path=str(checkpoint_path),
            spatial_upsampler_path=str(spatial_upsampler_path),
            gemma_root_path=str(gemma_root),
            loras=tuple(loras_for_builder),
            quantization=getattr(ledger, "quantization", None),
        )
        new_transformer_cpu = tmp_ledger.transformer()

        progress(0.70, desc="Extracting fused state_dict")
        state = {
            k: v.detach().cpu().contiguous()
            for k, v in new_transformer_cpu.state_dict().items()
        }
        save_file(state, str(cache_path))

        PENDING_LORA_KEY = key
        PENDING_LORA_STATE = state
        PENDING_LORA_STATUS = f"Built and cached LoRA state: {cache_path.name}"
        return PENDING_LORA_STATUS

    except Exception as e:
        import traceback
        print(f"[LoRA] Prepare failed: {type(e).__name__}: {e}")
        print(traceback.format_exc())
        PENDING_LORA_KEY = None
        PENDING_LORA_STATE = None
        PENDING_LORA_STATUS = f"LoRA prepare failed: {type(e).__name__}: {e}"
        return PENDING_LORA_STATUS

    finally:
        try:
            del new_transformer_cpu
        except Exception:
            pass
        try:
            del tmp_ledger
        except Exception:
            pass
        gc.collect()


def apply_prepared_lora_state_to_pipeline():
    """
    Fast step: copy the already prepared CPU state into the live transformer.
    This is the only part that should remain near generation time.
    """
    global current_lora_key, PENDING_LORA_KEY, PENDING_LORA_STATE

    if PENDING_LORA_STATE is None or PENDING_LORA_KEY is None:
        print("[LoRA] No prepared LoRA state available; skipping.")
        return False

    if current_lora_key == PENDING_LORA_KEY:
        print("[LoRA] Prepared LoRA state already active; skipping.")
        return True

    existing_transformer = _transformer
    with torch.no_grad():
        missing, unexpected = existing_transformer.load_state_dict(PENDING_LORA_STATE, strict=False)
        if missing or unexpected:
            print(f"[LoRA] load_state_dict mismatch: missing={len(missing)}, unexpected={len(unexpected)}")

    current_lora_key = PENDING_LORA_KEY
    print("[LoRA] Prepared LoRA state applied to the pipeline.")
    return True

# ---- REPLACE PRELOAD BLOCK START ----
# Preload all models for ZeroGPU tensor packing.
print("Preloading all models (including Gemma and audio components)...")
ledger = pipeline.model_ledger

# Save the original factory methods so we can rebuild individual components later.
# These are bound callables on ledger that will call the builder when invoked.
_orig_transformer_factory = ledger.transformer
_orig_video_encoder_factory = ledger.video_encoder
_orig_video_decoder_factory = ledger.video_decoder
_orig_audio_encoder_factory = ledger.audio_encoder
_orig_audio_decoder_factory = ledger.audio_decoder
_orig_vocoder_factory = ledger.vocoder
_orig_spatial_upsampler_factory = ledger.spatial_upsampler
_orig_text_encoder_factory = ledger.text_encoder
_orig_gemma_embeddings_factory = ledger.gemma_embeddings_processor

# Call the original factories once to create the cached instances we will serve by default.
_transformer = _orig_transformer_factory()
_video_encoder = _orig_video_encoder_factory()
_video_decoder = _orig_video_decoder_factory()
_audio_encoder = _orig_audio_encoder_factory()
_audio_decoder = _orig_audio_decoder_factory()
_vocoder = _orig_vocoder_factory()
_spatial_upsampler = _orig_spatial_upsampler_factory()
_text_encoder = _orig_text_encoder_factory()
_embeddings_processor = _orig_gemma_embeddings_factory()

# Replace ledger methods with lightweight lambdas that return the cached instances.
# We keep the original factories above so we can call them later to rebuild components.
ledger.transformer = lambda: _transformer
ledger.video_encoder = lambda: _video_encoder
ledger.video_decoder = lambda: _video_decoder
ledger.audio_encoder = lambda: _audio_encoder
ledger.audio_decoder = lambda: _audio_decoder
ledger.vocoder = lambda: _vocoder
ledger.spatial_upsampler = lambda: _spatial_upsampler
ledger.text_encoder = lambda: _text_encoder
ledger.gemma_embeddings_processor = lambda: _embeddings_processor

print("All models preloaded (including Gemma text encoder and audio encoder)!")
# ---- REPLACE PRELOAD BLOCK END ----

print("=" * 80)
print("Pipeline ready!")
print("=" * 80)


def log_memory(tag: str):
    if torch.cuda.is_available():
        allocated = torch.cuda.memory_allocated() / 1024**3
        peak = torch.cuda.max_memory_allocated() / 1024**3
        free, total = torch.cuda.mem_get_info()
        print(f"[VRAM {tag}] allocated={allocated:.2f}GB peak={peak:.2f}GB free={free / 1024**3:.2f}GB total={total / 1024**3:.2f}GB")


def detect_aspect_ratio(image) -> str:
    if image is None:
        return "16:9"
    if hasattr(image, "size"):
        w, h = image.size
    elif hasattr(image, "shape"):
        h, w = image.shape[:2]
    else:
        return "16:9"
    ratio = w / h
    candidates = {"16:9": 16 / 9, "9:16": 9 / 16, "1:1": 1.0}
    return min(candidates, key=lambda k: abs(ratio - candidates[k]))


def on_image_upload(first_image, last_image, high_res):
    ref_image = first_image if first_image is not None else last_image
    aspect = detect_aspect_ratio(ref_image)
    tier = "high" if high_res else "low"
    w, h = RESOLUTIONS[tier][aspect]
    return gr.update(value=w), gr.update(value=h)


def on_highres_toggle(first_image, last_image, high_res):
    ref_image = first_image if first_image is not None else last_image
    aspect = detect_aspect_ratio(ref_image)
    tier = "high" if high_res else "low"
    w, h = RESOLUTIONS[tier][aspect]
    return gr.update(value=w), gr.update(value=h)


def get_gpu_duration(
    first_image,
    last_image,
    input_audio,
    prompt: str,
    duration: float,
    gpu_duration: float,
    enhance_prompt: bool = True,
    seed: int = 42,
    randomize_seed: bool = True,
    height: int = 1024,
    width: int = 1536,
    pose_strength: float = 0.0,
    general_strength: float = 0.0,
    motion_strength: float = 0.0,
    dreamlay_strength: float = 0.0,
    mself_strength: float = 0.0,
    dramatic_strength: float = 0.0,
    fluid_strength: float = 0.0,
    liquid_strength: float = 0.0,
    demopose_strength: float = 0.0,
    voice_strength: float = 0.0,
    realism_strength: float = 0.0,
    transition_strength: float = 0.0,
    progress=None,
):
    return int(gpu_duration)

@spaces.GPU(duration=get_gpu_duration)
@torch.inference_mode()
def generate_video(
    first_image,
    last_image,
    input_audio,
    prompt: str,
    duration: float,
    gpu_duration: float,
    enhance_prompt: bool = True,
    seed: int = 42,
    randomize_seed: bool = True,
    height: int = 1024,
    width: int = 1536,
    pose_strength: float = 0.0,
    general_strength: float = 0.0,
    motion_strength: float = 0.0,
    dreamlay_strength: float = 0.0,
    mself_strength: float = 0.0,
    dramatic_strength: float = 0.0,
    fluid_strength: float = 0.0,
    liquid_strength: float = 0.0,
    demopose_strength: float = 0.0,
    voice_strength: float = 0.0,
    realism_strength: float = 0.0,
    transition_strength: float = 0.0,
    progress=gr.Progress(track_tqdm=True),
):
    try:
        torch.cuda.reset_peak_memory_stats()
        log_memory("start")

        current_seed = random.randint(0, MAX_SEED) if randomize_seed else int(seed)

        frame_rate = DEFAULT_FRAME_RATE
        num_frames = int(duration * frame_rate) + 1
        num_frames = ((num_frames - 1 + 7) // 8) * 8 + 1

        print(f"Generating: {height}x{width}, {num_frames} frames ({duration}s), seed={current_seed}")

        images = []
        output_dir = Path("outputs")
        output_dir.mkdir(exist_ok=True)

        if first_image is not None:
            temp_first_path = output_dir / f"temp_first_{current_seed}.jpg"
            if hasattr(first_image, "save"):
                first_image.save(temp_first_path)
            else:
                temp_first_path = Path(first_image)
            images.append(ImageConditioningInput(path=str(temp_first_path), frame_idx=0, strength=1.0))

        if last_image is not None:
            temp_last_path = output_dir / f"temp_last_{current_seed}.jpg"
            if hasattr(last_image, "save"):
                last_image.save(temp_last_path)
            else:
                temp_last_path = Path(last_image)
            images.append(ImageConditioningInput(path=str(temp_last_path), frame_idx=num_frames - 1, strength=1.0))

        tiling_config = TilingConfig.default()
        video_chunks_number = get_video_chunks_number(num_frames, tiling_config)

        log_memory("before pipeline call")

        apply_prepared_lora_state_to_pipeline()

        video, audio = pipeline(
            prompt=prompt,
            seed=current_seed,
            height=int(height),
            width=int(width),
            num_frames=num_frames,
            frame_rate=frame_rate,
            images=images,
            audio_path=input_audio,
            tiling_config=tiling_config,
            enhance_prompt=enhance_prompt,
        )

        log_memory("after pipeline call")

        output_path = tempfile.mktemp(suffix=".mp4")
        encode_video(
            video=video,
            fps=frame_rate,
            audio=audio,
            output_path=output_path,
            video_chunks_number=video_chunks_number,
        )

        log_memory("after encode_video")
        return str(output_path), current_seed

    except Exception as e:
        import traceback
        log_memory("on error")
        print(f"Error: {str(e)}\n{traceback.format_exc()}")
        return None, current_seed


with gr.Blocks(title="LTX-2.3 Distilled") as demo:
    gr.Markdown("# LTX-2.3 F2LF with Fast Audio-Video Generation with Frame Conditioning")
    

    with gr.Row():
        with gr.Column():
            with gr.Row():
                first_image = gr.Image(label="First Frame (Optional)", type="pil")
                last_image = gr.Image(label="Last Frame (Optional)", type="pil")
            input_audio = gr.Audio(label="Audio Input (Optional)", type="filepath")
            prompt = gr.Textbox(
                label="Prompt",
                info="for best results - make it as elaborate as possible",
                value="Make this image come alive with cinematic motion, smooth animation",
                lines=3,
                placeholder="Describe the motion and animation you want...",
            )
            duration = gr.Slider(label="Duration (seconds)", minimum=1.0, maximum=30.0, value=10.0, step=0.1)
                

            generate_btn = gr.Button("Generate Video", variant="primary", size="lg")

            with gr.Accordion("Advanced Settings", open=False):
                seed = gr.Slider(label="Seed", minimum=0, maximum=MAX_SEED, value=10, step=1)
                randomize_seed = gr.Checkbox(label="Randomize Seed", value=True)
                with gr.Row():
                    width = gr.Number(label="Width", value=1536, precision=0)
                    height = gr.Number(label="Height", value=1024, precision=0)
                with gr.Row():
                    enhance_prompt = gr.Checkbox(label="Enhance Prompt", value=False)
                    high_res = gr.Checkbox(label="High Resolution", value=True)
                with gr.Column():
                    gr.Markdown("### LoRA adapter strengths (set to 0 to disable; slow and WIP)")
                    pose_strength = gr.Slider(
                        label="Anthro Enhancer strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    general_strength = gr.Slider(
                        label="Reasoning Enhancer strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    motion_strength = gr.Slider(
                        label="Anthro Posing Helper strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    dreamlay_strength = gr.Slider(
                        label="Dreamlay strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    mself_strength = gr.Slider(
                        label="Mself strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    dramatic_strength = gr.Slider(
                        label="Dramatic strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    fluid_strength = gr.Slider(
                        label="Fluid Helper strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    liquid_strength = gr.Slider(
                        label="Transition Helper strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    demopose_strength = gr.Slider(
                        label="Audio Helper strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    voice_strength = gr.Slider(
                        label="Voice Helper strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    realism_strength = gr.Slider(
                        label="Anthro Realism strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                    transition_strength = gr.Slider(
                        label="Transition strength",
                        minimum=0.0, maximum=2.0, value=0.0, step=0.01
                    )
                prepare_lora_btn = gr.Button("Prepare / Load LoRA Cache", variant="secondary")
                lora_status = gr.Textbox(
                    label="LoRA Cache Status",
                    value="No LoRA state prepared yet.",
                    interactive=False,
                )

        with gr.Column():
            output_video = gr.Video(label="Generated Video", autoplay=False)
            gpu_duration = gr.Slider(
                label="ZeroGPU duration (seconds; 10 second Img2Vid with 1024x1024 and LoRAs = ~70)",
                minimum=30.0,
                maximum=240.0,
                value=75.0,
                step=1.0,
            )

    gr.Examples(
        examples=[
            [
                None,
                "pinkknit.jpg",
                None,
                "The camera falls downward through darkness as if dropped into a tunnel. "
                "As it slows, five friends wearing pink knitted hats and sunglasses lean "
                "over and look down toward the camera with curious expressions. The lens "
                "has a strong fisheye effect, creating a circular frame around them. They "
                "crowd together closely, forming a symmetrical cluster while staring "
                "directly into the lens.",
                3.0,
                80.0,
                False,
                42,
                True,
                1024,
                1024,
                0.0,  # pose_strength (example)
                0.0,  # general_strength (example)
                0.0,  # motion_strength (example)
                0.0,
                0.0,
                0.0,
                0.0,
                0.0,
                0.0,
                0.0,
                0.0,
                0.0,
            ],
        ],
        inputs=[
            first_image, last_image, input_audio, prompt, duration, gpu_duration,
            enhance_prompt, seed, randomize_seed, height, width,
            pose_strength, general_strength, motion_strength, dreamlay_strength, mself_strength, dramatic_strength, fluid_strength, liquid_strength, demopose_strength, voice_strength, realism_strength, transition_strength,
        ],
    )

    first_image.change(
        fn=on_image_upload,
        inputs=[first_image, last_image, high_res],
        outputs=[width, height],
    )

    last_image.change(
        fn=on_image_upload,
        inputs=[first_image, last_image, high_res],
        outputs=[width, height],
    )

    high_res.change(
        fn=on_highres_toggle,
        inputs=[first_image, last_image, high_res],
        outputs=[width, height],
    )

    prepare_lora_btn.click(
        fn=prepare_lora_cache,
        inputs=[pose_strength, general_strength, motion_strength, dreamlay_strength, mself_strength, dramatic_strength, fluid_strength, liquid_strength, demopose_strength, voice_strength, realism_strength, transition_strength],
        outputs=[lora_status],
    )
    
    generate_btn.click(
        fn=generate_video,
        inputs=[
            first_image, last_image, input_audio, prompt, duration, gpu_duration, enhance_prompt,
            seed, randomize_seed, height, width,
            pose_strength, general_strength, motion_strength, dreamlay_strength, mself_strength, dramatic_strength, fluid_strength, liquid_strength, demopose_strength, voice_strength, realism_strength, transition_strength,
        ],
        outputs=[output_video, seed],
    )


css = """
.fillable{max-width: 1200px !important}
"""

if __name__ == "__main__":
    demo.launch(theme=gr.themes.Citrus(), css=css)