Linux下，基于CImg 实现音频波形实时显示(样式很beautiful)

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我是靠谱客的博主强健楼房，这篇文章主要介绍Linux下，基于CImg 实现音频波形实时显示(样式很beautiful)，现在分享给大家，希望可以做个参考。

项目背景：Linux下，通过麦克风采集音频，实时显示出音频的波形。

参考文章：

调用CImg库显示WAV格式音频波形_aoya9772的博客-CSDN博客
CImg库快速学习笔记_千灵域的博客-CSDN博客_cimg使用 (CImg 基本语法)
git:https://github.com/dtschump/CImg (examples中有很多实现demo)

代码实现：

由于网上实现的都是读取一个音频文件，然后绘制出音频波形，但我需要实时来显示采集到的音频，所以参考了原作者文章，稍微改造了一下。

复制代码

#include <iostream>
#include "wavfile.h"
#include "CImg.h"
#include <vector>
using namespace std;
using namespace cimg_library;
using namespace AudioUtils;

int main(void)
{

std::vector<float> vec;
    WaveFile *wf = new WaveFile();
    /*
    读取本目录里的audio.wav文件，并生成波形
    */
    wf->readwav("333.wav");

int datalength = wf->size() / wf->bit();

wf->output_WAVfile_info();

/*
    调用CImg显示波形
    */
    const unsigned char red[] = {255, 0, 0}, yellow[] = {0 ,139 ,0},
                        green[] = {75, 243, 167};

CImgDisplay main_disp_wav(1000, 300, "signal");

main_disp_wav.move(100, 100);

int num = wf->size() / (8 * (wf->bit()));

int k = 0;

int is_show = 0;

int *data = (int *)malloc(sizeof(int) * datalength);
    for (int i = 0; i < datalength; i++)
    {
        data[i] = (float)(wf->data[i] / 100);

if (i > 0 && (i + 1) % 16000 == 0)
        {
            for (int j = 0; j < 2000; j++)
            {
                vec.push_back((data[k * 8]) * 100);
                k++;
            }

if (vec.size() > 120000)
            {
                vec.erase(vec.begin(), vec.begin() + 2000);
            }

CImg<unsigned char> signal_visu = CImg<unsigned char>(1000, 300, 1, 3, 0);
            signal_visu.draw_grid(40, 50, 0, 0, 0, 0, yellow, 0.5);

CImg<float> signal_wav = CImg<float>(120000, 1, 1, 1, 0);

for (size_t i = 0; i < vec.size(); i++)
            {
                signal_wav[i] = vec[i];
            }

signal_visu.draw_graph(signal_wav, green, 1, 3, 1, 35000, -35000, 0);

main_disp_wav.display(signal_visu);
        }
    }

getchar();

return 0;
}

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#include <iostream>
#include "wavfile.h"
#include "CImg.h"
#include <vector>
using namespace std;
using namespace cimg_library;
using namespace AudioUtils;

int main(void)
{

    std::vector<float> vec;
    WaveFile *wf = new WaveFile();
    /*
    读取本目录里的audio.wav文件，并生成波形
    */
    wf->readwav("333.wav");

    int datalength = wf->size() / wf->bit();

    wf->output_WAVfile_info();

    /*
    调用CImg显示波形
    */
    const unsigned char red[] = {255, 0, 0}, yellow[] = {0 ,139 ,0},
                        green[] = {75, 243, 167};

    CImgDisplay main_disp_wav(1000, 300, "signal");

    main_disp_wav.move(100, 100);

    int num = wf->size() / (8 * (wf->bit()));

    int k = 0;

    int is_show = 0;

    int *data = (int *)malloc(sizeof(int) * datalength);
    for (int i = 0; i < datalength; i++)
    {
        data[i] = (float)(wf->data[i] / 100);

        if (i > 0 && (i + 1) % 16000 == 0)
        {
            for (int j = 0; j < 2000; j++)
            {
                vec.push_back((data[k * 8]) * 100);
                k++;
            }

            if (vec.size() > 120000)
            {
                vec.erase(vec.begin(), vec.begin() + 2000);
            }

            CImg<unsigned char> signal_visu = CImg<unsigned char>(1000, 300, 1, 3, 0);
            signal_visu.draw_grid(40, 50, 0, 0, 0, 0, yellow, 0.5);

            CImg<float> signal_wav = CImg<float>(120000, 1, 1, 1, 0);

            for (size_t i = 0; i < vec.size(); i++)
            {
                signal_wav[i] = vec[i];
            }

            signal_visu.draw_graph(signal_wav, green, 1, 3, 1, 35000, -35000, 0);

            main_disp_wav.display(signal_visu);
        }
    }

    getchar();

    return 0;
}