app.py

import time
import wavmark
import streamlit as st
import os
import torch
import datetime
import numpy as np
import soundfile
from wavmark.utils import file_reader


def my_read_file(audio_path, max_second):
    signal, sr, audio_length_second = file_reader.read_as_single_channel_16k(audio_path, default_sr)
    if audio_length_second > max_second:
        signal = signal[0:default_sr * max_second]
        audio_length_second = max_second

    return signal, sr, audio_length_second


def add_watermark(audio_path, watermark_text):
    t1 = time.time()
    assert len(watermark_text) == 16
    watermark_npy = np.array([int(i) for i in watermark_text])
    signal, sr, audio_length_second = my_read_file(audio_path, max_second_encode)
    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') + "_" + watermark_text + ".wav"
    tmp_file_path = '/tmp/' + tmp_file_name
    soundfile.write(tmp_file_path, watermarked_signal, sr)
    encode_time_cost = time.time() - t1
    return tmp_file_path, encode_time_cost


def decode_watermark(audio_path):
    assert os.path.exists(audio_path)

    t1 = time.time()
    signal, sr, audio_length_second = my_read_file(audio_path, max_second_decode)
    payload_decoded, _ = wavmark.decode_watermark(model, signal, show_progress=False)
    decode_cost = time.time() - t1

    if payload_decoded is None:
        return "No Watermark", decode_cost

    payload_decoded_str = "".join([str(i) for i in payload_decoded])
    st.write("Result:", payload_decoded_str)
    st.write("Time Cost:%d seconds" % (decode_cost))


def create_default_value():
    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


# Main web app
def main():
    create_default_value()

    # st.title("WavMark")
    # st.write("https://github.com/wavmark/wavmark")
    markdown_text = """
    # WavMark
    [WavMark](https://github.com/wavmark/wavmark) is the next-generation watermarking tool driven by AI. 
    You can upload an audio file and encode a custom 16-bit watermark or perform decoding from a watermarked audio.
    
    This page is for demonstration usage and only process **the first minute** of the audio. 
    If you have longer files for processing, we recommend using [our python toolkit](https://github.com/wavmark/wavmark).
    """

    # 使用st.markdown渲染Markdown文本
    st.markdown(markdown_text)

    audio_file = st.file_uploader("Upload Audio", type=["wav", "mp3"], accept_multiple_files=False)

    if audio_file:
        # 保存文件到本地：
        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())

        # 展示文件到页面上
        # st.audio(tmp_input_audio_file, format="audio/wav")

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

        if action == "Add Watermark":
            watermark_text = st.text_input("The watermark (0, 1 list of length-16):", 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..."):
                        watermarked_audio, encode_time_cost = add_watermark(tmp_input_audio_file, watermark_text)
                        st.write("Watermarked Audio:")
                        print("watermarked_audio:", 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":
            if st.button("Decode"):
                with st.spinner("Decoding..."):
                    decode_watermark(tmp_input_audio_file)


if __name__ == "__main__":
    default_sr = 16000
    max_second_encode = 60
    max_second_decode = 30
    len_start_bit = 16
    device = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu')
    model = wavmark.load_model().to(device)
    main()

    # audio_path = "/Users/my/Library/Mobile Documents/com~apple~CloudDocs/CODE/PycharmProjects/4_语音水印/419_huggingface水印/WavMark/example.wav"

    # decoded_watermark, decode_cost = decode_watermark(audio_path)
    # print(decoded_watermark)