app.py

import pdb
import time
import wavmark
import streamlit as st
import os
import torch
import uuid
import datetime
import numpy as np
import soundfile
from huggingface_hub import hf_hub_download, HfApi
from wavmark.utils import file_reader


# Function to add watermark to audio
def add_watermark(audio_path, watermark_text):
    assert len(watermark_text) == 16
    watermark_npy = np.array([int(i) for i in watermark_text])
    # todo: 控制时间

    signal, sr, audio_length_second = file_reader.read_as_single_channel_16k(audio_path, 16000)
    watermarked_signal, _ = wavmark.encode_watermark(model, signal, watermark_npy, show_progress=False)

    tmp_file_name = datetime.datetime.now().strftime('%Y-%m-%d_%H-%M-%S') + "_" + str(uuid.uuid4()) + ".wav"
    tmp_file_path = '/tmp/' + tmp_file_name
    soundfile.write(tmp_file_path, watermarked_signal, sr)
    return tmp_file_path


# Function to decode watermark from audio
def decode_watermark(audio_path):
    watermarked_signal, sr, audio_length_second = file_reader.read_as_single_channel_16k(audio_path, 16000)
    payload_decoded, _ = wavmark.decode_watermark(model, watermarked_signal, show_progress=False)

    if payload_decoded is None:
        return "No Watermark"

    return payload_decoded


# Main web app
def main():
    max_upload_size = 20 * 1024 * 1024  # 20 MB in bytes

    if "def_value" not in st.session_state:
        def_val_npy = np.random.choice([0, 1], size=32 - len_start_bit)
        def_val_str = "".join([str(i) for i in def_val_npy])
        st.session_state.def_value = def_val_str

    st.title("Neural Audio Watermark")
    st.write("Choose the action you want to perform:")

    action = st.selectbox("Select Action", ["Add Watermark", "Decode Watermark"])

    if action == "Add Watermark":
        audio_file = st.file_uploader("Upload Audio File (WAV)", type=["wav"], accept_multiple_files=False,
                                      max_upload_size=max_upload_size)
        if audio_file:
            tmp_input_audio_file = os.path.join("/tmp/", audio_file.name)
            with open(tmp_input_audio_file, "wb") as f:
                f.write(audio_file.getbuffer())
            st.audio(tmp_input_audio_file, format="audio/wav")

            watermark_text = st.text_input("Enter Watermark", value=st.session_state.def_value)

            add_watermark_button = st.button("Add Watermark", key="add_watermark_btn")
            if add_watermark_button:  # 点击按钮后执行的
                if audio_file and watermark_text:
                    with st.spinner("Adding Watermark..."):
                        # add_watermark_button.empty()
                        # st.button("Add Watermark", disabled=True)
                        # st.button("Add Watermark", disabled=True, key="add_watermark_btn_disabled")
                        t1 = time.time()

                        watermarked_audio = add_watermark(tmp_input_audio_file, watermark_text)
                        encode_time_cost = time.time() - t1

                        st.write("Watermarked Audio:")
                        st.audio(watermarked_audio, format="audio/wav")
                        st.write("Time Cost:%d seconds" % encode_time_cost)

                        # st.button("Add Watermark", disabled=False)

    elif action == "Decode Watermark":
        audio_file = st.file_uploader("Upload Audio File (WAV/MP3)", type=["wav", "mp3"], accept_multiple_files=False,
                                      max_upload_size=max_upload_size)
        if audio_file:
            if st.button("Decode Watermark"):
                # 1.保存
                tmp_file_for_decode_path = os.path.join("/tmp/", audio_file.name)
                with open(tmp_file_for_decode_path, "wb") as f:
                    f.write(audio_file.getbuffer())

                # 2.执行
                with st.spinner("Decoding..."):
                    t1 = time.time()
                    decoded_watermark = decode_watermark(tmp_file_for_decode_path)
                    decode_cost = time.time() - t1

                print("decoded_watermark", decoded_watermark)
                # Display the decoded watermark
                st.write("Decoded Watermark:", decoded_watermark)
                st.write("Time Cost:%d seconds" % (decode_cost))


if __name__ == "__main__":
    len_start_bit = 16

    device = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu')
    model = wavmark.load_model().to(device)

    main()