app.py

import gradio as gr 

import glob
import os
import shutil
import tempfile
from pydub import AudioSegment
from moviepy.editor import VideoFileClip, AudioFileClip, concatenate_videoclips, ImageClip

is_shared_ui = True if "fffiloni/Hibiki-simple" in os.environ['SPACE_ID'] else False

def extract_audio_as_mp3(video_path: str) -> str:
    """
    Extracts the audio from a video file and saves it as a temporary MP3 file.

    :param video_path: Path to the input video file.
    :return: Path to the temporary MP3 file.
    """
    # Load the video
    video = VideoFileClip(video_path)
    
    # Create a temporary file for the extracted audio
    temp_audio = tempfile.NamedTemporaryFile(delete=False, suffix=".mp3")
    
    # Extract and export the audio as MP3
    video.audio.write_audiofile(temp_audio.name, codec="mp3")
    
    return temp_audio.name  # Return the temp file path
    
def process_audio(input_file):
    # Load the audio file
    audio = AudioSegment.from_file(input_file)
    
    # Ensure it's in MP3 format
    output_file = os.path.splitext(input_file)[0] + ".mp3"

    if is_shared_ui:
        # Limit duration to 1 minute (60,000 ms)
        if len(audio) > 60000:
            audio = audio[:60000]  # Trim to 60 seconds
    
    # Export as MP3
    audio.export(output_file, format="mp3")
    return output_file

def cleanup_old_audio():
    """Remove old audio files before starting a new inference."""
    files_to_remove = glob.glob("out_en-*.wav") + glob.glob("final_output.wav")
    
    if files_to_remove:
        print(f"Cleaning up {len(files_to_remove)} old audio files...")
        for file in files_to_remove:
            try:
                os.remove(file)
                print(f"Deleted: {file}")
            except Exception as e:
                print(f"Error deleting {file}: {e}")
    else:
        print("No old audio files found.")

def find_audio_chunks():
    """Finds all out_en-*.wav files, sorts them, and returns the file paths."""
    wav_files = glob.glob("out_en-*.wav")
    
    # Extract numbers and sort properly
    wav_files.sort(key=lambda x: int(x.split('-')[-1].split('.')[0]))

    print(f"Found {len(wav_files)} audio chunks: {wav_files}")
    
    return wav_files  # Returning the list of file paths

def concatenate_audio(output_filename="final_output.wav"):
    """Concatenates all audio chunks and saves them to a final output file in a temporary directory."""
    
    wav_files = find_audio_chunks()  # Get sorted audio file paths
    
    if not wav_files:
        print("No audio files found.")
        return []

    # Create a temporary directory
    temp_dir = tempfile.mkdtemp()
    
    # Load and concatenate all audio files
    #combined = AudioSegment.empty()
    temp_wav_files = []
    
    for file in wav_files:
        #audio = AudioSegment.from_wav(file)
        #combined += audio
        
        # Move individual files to the temp directory
        temp_file_path = os.path.join(temp_dir, os.path.basename(file))
        shutil.move(file, temp_file_path)
        temp_wav_files.append(temp_file_path)

    # Define the final output path in the temporary directory
    #temp_output_path = os.path.join(temp_dir, output_filename)
    
    # Export the final combined audio
    #combined.export(temp_output_path, format="wav")
    #print(f"Concatenated audio saved at {temp_output_path}")
    
    return temp_wav_files[0], temp_wav_files  # Returning temp paths


def infer(audio_input_path):

    cleanup_old_audio()
    audio_input_path = process_audio(audio_input_path)
    print(f"Processed file saved as: {audio_input_path}")

    import subprocess

    command = [
        "python", "-m", "moshi.run_inference",
        f"{audio_input_path}", "out_en.wav",
        "--hf-repo", "kyutai/hibiki-1b-pytorch-bf16"
    ]

    result = subprocess.run(command, capture_output=True, text=True)

    # Print the standard output and error
    print("STDOUT:", result.stdout)
    print("STDERR:", result.stderr)

    # Check if the command was successful
    if result.returncode == 0:
        print("Command executed successfully.")
        first_out, file_list = concatenate_audio()
        return first_out, gr.update(choices=file_list, value=file_list[0], visible=True), gr.update(visible=True), gr.update(value=file_list, visible=True), gr.update(visible=True), gr.update(visible=True), gr.update(visible=True)
    else:
        print("Error executing command.")
        raise gr.Error("Error executing command")

def load_chosen_audio(audio_path):
    return audio_path

def overlay_audio(
    original_mp3: str,
    translated_wav: str,
    volume_reduction_db: int = 10,
    cut_start: float = 0.0
) -> str:
    """
    Overlays translated audio on top of the original, reduces the original volume,
    and ensures the final audio lasts as long as the longer of the two tracks.
    
    :param original_mp3: Path to the original MP3 file.
    :param translated_wav: Path to the translated WAV file.
    :param volume_reduction_db: Volume reduction in dB (default is -10 dB).
    :param cut_start: Number of seconds to trim from the start of the translated audio (default: 0.0).
    :return: Path to the temporary output WAV file.
    """
    # Load original MP3 and convert to WAV
    original = AudioSegment.from_mp3(original_mp3).set_frame_rate(16000).set_channels(1)
    
    # Lower the volume
    original = original - volume_reduction_db
    
    # Load the translated WAV
    translated = AudioSegment.from_wav(translated_wav).set_frame_rate(16000).set_channels(1)

    # Trim the start of the translated audio if needed
    if cut_start > 0:
        cut_ms = int(cut_start * 1000)  # Convert seconds to milliseconds
        translated = translated[cut_ms:]

    # Determine the final length (longer of the two)
    final_length = max(len(original), len(translated))

    # Extend the shorter track with silence to match the longer track
    if len(original) < final_length:
        original += AudioSegment.silent(duration=final_length - len(original))
    if len(translated) < final_length:
        translated += AudioSegment.silent(duration=final_length - len(translated))

    # Overlay the translated speech over the original
    combined = original.overlay(translated)

    # Create a temporary file to save the output
    temp_file = tempfile.NamedTemporaryFile(delete=False, suffix=".wav")
    combined.export(temp_file.name, format="wav")

    print(f"Final audio saved at: {temp_file.name}")
    return temp_file.name

def process_final_combination(audio_in, chosen_translated, volume, cut_start, video_input):
    audio_in = process_audio(audio_in)
    temp_output_path = overlay_audio(audio_in, chosen_translated, volume, cut_start)

    if video_input:
        return gr.update(value=temp_output_path, visible=True), gr.update(visible=True)
    else:
        return gr.update(value=temp_output_path, visible=True), gr.update(visible=False)

def replace_video_audio(video_path: str, new_audio_path: str) -> str:
    """Replaces the original audio in the video and extends it if the new audio is longer.
    
    Returns the path to a temporary video file.
    """
    
    # Debugging: Ensure video_path is a string
    print(f"DEBUG: video_path = {video_path}, type = {type(video_path)}")

    if not isinstance(video_path, str):
        raise ValueError(f"video_path must be a string, got {type(video_path)}")

    # Load video
    video = VideoFileClip(video_path)
    
    # Load new audio
    new_audio = AudioFileClip(new_audio_path)

    # Extend video if new audio is longer
    if new_audio.duration > video.duration:
        last_frame = video.get_frame(video.duration - 0.1)  # Extract last frame
        freeze_frame = ImageClip(last_frame).set_duration(new_audio.duration - video.duration)
        freeze_frame = freeze_frame.set_fps(video.fps)  # Maintain video frame rate

        video = concatenate_videoclips([video, freeze_frame])

    # Set new audio
    video = video.set_audio(new_audio)
    
    # Create a temp file
    temp_video = tempfile.NamedTemporaryFile(delete=False, suffix=".mp4")
    
    # Save video (explicit codec settings for MoviePy <2.0)
    video.write_videofile(
        temp_video.name,
        codec="libx264",
        audio_codec="aac",
        fps=video.fps,  # Ensure FPS is set correctly
        preset="medium"  # Optional: Can be "slow", "medium", or "fast"
    )

    
    return gr.update(value=temp_video.name, visible=True)  # Return path to temp video file

def clean_previous_video_input():
    return gr.update(value=None)

def show_upcoming_component():
    return gr.update(visible=True)
    
def hide_previous():
    return gr.update(visible=False), gr.update(visible=False), gr.update(visible=False), gr.update(visible=False), gr.update(visible=False), gr.update(visible=False), gr.update(visible=False), gr.update(visible=False), gr.update(visible=False) 

css="""
div#col-container{
    margin: 0 auto;
    max-width: 1200px;
}
"""

with gr.Blocks(css=css) as demo:
    with gr.Column(elem_id="col-container"):
        gr.Markdown("# Hibiki ")
        gr.Markdown("This is a simple demo for Kyutai's Hibiki translation models • Currently supports French to English only.")
        gr.HTML("""
        <div style="display:flex;column-gap:4px;">
            <a href="https://huggingface.co/spaces/fffiloni/Hibiki-simple?duplicate=true">
                <img src="https://huggingface.co/datasets/huggingface/badges/resolve/main/duplicate-this-space-sm.svg" alt="Duplicate this Space">
            </a>
        </div>
        """)
        with gr.Row():
            with gr.Column(scale=2):
                video_input = gr.Video(label="Video IN (Optional)")
                audio_input = gr.Audio(label="Audio IN", type="filepath")
                submit_btn = gr.Button("Generate translations")

                gr.Examples(
                    examples = [
                        "./examples/sample_fr_hibiki_intro.mp3",
                        "./examples/sample_fr_hibiki_crepes.mp3",
                        "./examples/sample_fr_hibiki_monologue_otis.mp3"
                    ],
                    inputs = [audio_input]
                )
        
            with gr.Column(scale=3):
                output_result = gr.Audio(label="Translated result")

                with gr.Row():
                    dropdown_wav_selector = gr.Dropdown(
                        label="Pick a generated translated audio to load",
                        value = None,
                        visible=False,
                        scale=2
                    )
                    choose_this_btn = gr.Button("Apply and check this one as translated audio overlay", scale=1, visible=False)
                
                with gr.Row():
                    volume_reduction = gr.Slider(label="Original audio Volume reduction", minimum=0, maximum=60, step=1, value=30, visible=False)
                    cut_start = gr.Slider(label="Reduce translator delay (seconds)", minimum=0.0, maximum=4.0, step=0.1, value=2.0, visible=False)
               
                combined_output = gr.Audio(label="Combinated Audio", type="filepath", visible=False, show_download_button=True)
                apply_to_video_btn = gr.Button("Apply this combination to your video", visible=False)
                
                final_video_out = gr.Video(label="Video + Translated Audio", visible=False)
                with gr.Accordion("Downloadable audio Output list", open=False, visible=False) as result_accordion:
                    wav_list = gr.Files(label="Output Audio List", visible=False)     

    audio_input.upload(
        fn = clean_previous_video_input,
        inputs = None,
        outputs = [video_input]
    )
    
    video_input.upload(
        fn = extract_audio_as_mp3,
        inputs = [video_input],
        outputs = [audio_input]
    )
    
    dropdown_wav_selector.select(
        fn = load_chosen_audio,
        inputs = [dropdown_wav_selector],
        outputs = [output_result],
        queue = False
    )

    choose_this_btn.click(
        fn = show_upcoming_component,
        inputs=None,
        outputs=[combined_output]
    ).then(
        fn = process_final_combination,
        inputs = [audio_input, dropdown_wav_selector, volume_reduction, cut_start, video_input],
        outputs = [combined_output, apply_to_video_btn]
    )

    apply_to_video_btn.click(
        fn = show_upcoming_component,
        inputs=None,
        outputs=[final_video_out]
    ).then(
        fn = replace_video_audio,
        inputs = [video_input, combined_output],
        outputs = [final_video_out]
    )

    submit_btn.click(
        fn = hide_previous,
        inputs = None,
        outputs = [dropdown_wav_selector, result_accordion,  wav_list, choose_this_btn, combined_output, apply_to_video_btn, final_video_out, volume_reduction, cut_start]
    ).then(
        fn = infer,
        inputs = [audio_input],
        outputs = [output_result, dropdown_wav_selector, result_accordion, wav_list, choose_this_btn, volume_reduction, cut_start]
    )

demo.queue().launch(show_api=False, show_error=True)