app.py

import gradio as gr
from TTS.api import TTS

# =========================
# Load Model (CPU / Zero GPU)
# =========================
print("Loading ai4bharat Indic TTS model (CPU)...")

tts = TTS(
    model_name="ai4bharat/indic-tts-coqui-misc",
    gpu=False,
    progress_bar=False
)

print("Model loaded successfully.")

# =========================
# TTS Function
# =========================
def text_to_speech(text):
    if not text or not text.strip():
        return None

    output_path = "tts_output.wav"

    tts.tts_to_file(
        text=text,
        file_path=output_path,
        language="hi"
    )

    return output_path


# =========================
# Fake Voice Clone Handler
# (Explains limitation clearly)
# =========================
def voice_clone(text, reference_audio):
    """
    NOTE:
    ai4bharat/indic-tts-coqui-misc
    DOES NOT support voice cloning.
    This function falls back to normal TTS.
    """

    if not text or not text.strip():
        return None

    output_path = "clone_fallback.wav"

    tts.tts_to_file(
        text=text,
        file_path=output_path,
        language="hi"
    )

    return output_path


# =========================
# Gradio UI
# =========================
with gr.Blocks(title="Hindi TTS (Zero GPU)") as demo:
    gr.Markdown(
        """
        ## 🗣 Hindi Text to Speech (Zero GPU)

        **Model:** ai4bharat/indic-tts-coqui-misc  
        **Hardware:** CPU / Zero GPU  

        ⚠️ **Voice cloning is NOT supported by this model.**  
        Reference audio upload is shown only for UI completeness.
        """
    )

    with gr.Tab("🔊 Text to Speech"):
        tts_text = gr.Textbox(
            label="Hindi Text",
            placeholder="यहाँ हिंदी टेक्स्ट लिखें...",
            lines=4
        )
        tts_btn = gr.Button("Generate Voice")
        tts_audio = gr.Audio(type="filepath", label="Output Audio")

        tts_btn.click(
            fn=text_to_speech,
            inputs=tts_text,
            outputs=tts_audio
        )

    with gr.Tab("🎙 Voice Clone (Fallback)"):
        clone_text = gr.Textbox(
            label="Hindi Text",
            placeholder="यहाँ टेक्स्ट लिखें...",
            lines=4
        )
        ref_audio = gr.Audio(
            label="Upload Reference Voice (Not Used)",
            type="filepath"
        )
        clone_btn = gr.Button("Generate (TTS Fallback)")
        clone_audio = gr.Audio(type="filepath", label="Generated Audio")

        clone_btn.click(
            fn=voice_clone,
            inputs=[clone_text, ref_audio],
            outputs=clone_audio
        )

demo.launch()