How does Kirin OS provide conversion and processing of audio and video files?

How does Kirin OS provide conversion and processing of audio and video files?

Introduction:
Kirin operating system is an operating system based on the Linux kernel independently developed by China. It is highly customizable and secure, and offers a wealth of features and tools to meet user needs. One of the important features is the conversion and processing of audio and video files. This article will introduce the relevant functions provided by Kirin Operating System and demonstrate how to use code to achieve conversion and processing.

1. Audio file conversion and processing

1. File conversion
   Kylin operating system provides a wealth of tools and libraries to support the conversion of audio files. Among them, FFmpeg is a powerful open source audio and video processing tool that can convert audio files in multiple formats. The following is a sample code that uses FFmpeg to convert an audio file in mp3 format to wav format:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char** argv) {
    // 调用FFmpeg进行转换
    char cmd[256];
    sprintf(cmd, "ffmpeg -i input.mp3 output.wav");
    system(cmd);

    return 0;
}

In the above code, the system command is called to perform the conversion operation of FFmpeg. Users only need to name the audio file that needs to be converted as "input.mp3" and set the target file name as "output.wav".

2. File processing
   In addition to file conversion, Kirin operating system also provides some functions and libraries for processing audio files. For example, libsndfile is a library for reading and writing audio files. The following is a sample code that uses libsndfile to read an audio file and output its information:

#include <stdio.h>
#include <sndfile.h>

int main(int argc, char** argv) {
    // 打开音频文件
    SNDFILE* file = sf_open("input.wav", SFM_READ, NULL);
    if (file == NULL) {
        printf("Failed to open input file
");
        return -1;
    }
    
    // 输出音频文件信息
    printf("Channels: %d
", sf_info.channels);
    printf("Sample Rate: %d
", sf_info.samplerate);
    printf("Frames: %d
", sf_info.frames);
    
    // 关闭音频文件
    sf_close(file);

    return 0;
}

In the above code, an audio file named "input.wav" is opened using the libsndfile library and outputs Information such as its channel number, sampling rate, and frame number.

2. Video file conversion and processing

1. File conversion
   Kylin operating system also provides powerful tools and libraries to support the conversion of video files. Among them, FFmpeg can also convert video files. The following is a sample code that uses FFmpeg to convert a video file in mp4 format to avi format:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char** argv) {
    // 调用FFmpeg进行转换
    char cmd[256];
    sprintf(cmd, "ffmpeg -i input.mp4 output.avi");
    system(cmd);

    return 0;
}

In the above code, the system command is called to perform the conversion operation of FFmpeg. Users only need to name the video file that needs to be converted as "input.mp4" and set the target file name as "output.avi".

2. File processing
   Kirin operating system also provides some functions and libraries for processing video files. For example, OpenCV is a widely used open source computer vision library that can be used to process image frames in video files. The following is a sample code that uses OpenCV to read a video file and output each frame of image:

#include <opencv2/opencv.hpp>

int main(int argc, char** argv) {
    // 打开视频文件
    cv::VideoCapture cap("input.avi");
    if (!cap.isOpened()) {
        printf("Failed to open input file
");
        return -1;
    }

    cv::Mat frame;
    while (cap.read(frame)) {
        // 处理每一帧图像
        // ...

        // 显示图像
        cv::imshow("Frame", frame);
        cv::waitKey(20);
    }

    // 关闭视频文件
    cap.release();

    return 0;
}

In the above code, a video file named "input.avi" is opened using the OpenCV library. And use the cap.read() function to continuously read each frame of image for processing.

Conclusion:
Kirin operating system provides rich functions and tools to support the conversion and processing of audio and video files. By using libraries such as FFmpeg and libsndfile, users can easily convert and process audio files. By using libraries such as FFmpeg and OpenCV, users can easily convert and process video files. These functions not only enrich the application scenarios of Kirin operating system, but also provide developers with convenient tools to achieve various audio and video processing needs.

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