c语言 怎么写打开wav

在C语言中，我们可以使用第三方库来打开和处理WAV文件，一个常用的库是libsndfile，它是一个用于读取、写入和操作音频文件的库，以下是如何使用libsndfile库打开WAV文件的详细步骤：

1、确保已经安装了libsndfile库，在Linux系统上，可以使用以下命令安装：

sudo aptget install libsndfile1dev

在Windows系统上，可以从官方网站下载源代码并编译，或者从第三方网站下载预编译的库。

2、创建一个名为wav_reader.c的C文件，并在其中包含以下头文件：

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

3、编写一个名为open_wav_file的函数，该函数接受一个文件名作为参数，并返回一个指向SF_INFO结构的指针，这个结构包含了WAV文件的信息，如采样率、通道数等。

SF_INFO *open_wav_file(const char *filename) {
    SF_INFO sfinfo;
    SNDFILE *sndfile = NULL;
    sfinfo.format = 0;
    sfinfo.channels = 0;
    sfinfo.samplerate = 0;
    sfinfo.frames = 0;
    sfinfo.sections = 0;
    sfinfo.seekable = 0;
    sfinfo.tellable = 0;
    sfinfo.readable = 1;
    sfinfo.writeable = 0;
    sfinfo.maxlength = 0;
    sfinfo.type = 0;
    sfinfo.signal = 0;
    sfinfo.offset = 0;
    sfinfo.underflow = 0;
    sfinfo.overflow = 0;
    sfinfo.eof = 0;
    sfinfo.error = 0;
    sfinfo.comm = NULL;
    sfinfo.userdata = NULL;
    sfinfo.container = NULL;
    sfinfo.num_subclasses = 0;
    sfinfo.next_subclass = NULL;
    memset(&sfinfo, 0, sizeof(SF_INFO));
    if ((sndfile = sf_open(filename, SFM_READ, &sfinfo)) == NULL) {
        printf("Error: Unable to open WAV file '%s'
", filename);
        return NULL;
    }
    return &sfinfo;
}

4、编写一个名为main的函数，用于测试open_wav_file函数，在这个函数中，我们将调用open_wav_file函数打开一个WAV文件，并打印出文件的信息。

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s <wav_file>
", argv[0]);
        return 1;
    }
    SF_INFO *sfinfo = open_wav_file(argv[1]);
    if (sfinfo == NULL) {
        return 1;
    }
    printf("File format: %d
", sfinfo>format & SF_FORMAT_TYPEMASK);
    printf("Channels: %d
", sfinfo>channels);
    printf("Sample rate: %d
", sfinfo>samplerate);
    printf("Frames: %ld
", sfinfo>frames);
    printf("Sections: %d
", sfinfo>sections);
    printf("Seekable: %d
", sfinfo>seekable);
    printf("Tellable: %d
", sfinfo>tellable);
    printf("Readable: %d
", sfinfo>readable);
    printf("Writeable: %d
", sfinfo>writeable);
    printf("Max length: %ld
", sfinfo>maxlength);
    printf("Type: %d
", sfinfo>type);
    printf("Signal: %d
", sfinfo>signal);
    printf("Offset: %ld
", sfinfo>offset);
    printf("Underflow: %d
", sfinfo>underflow);
    printf("Overflow: %d
", sfinfo>overflow);
    printf("EOF: %d
", sfinfo>eof);
    printf("Error: %d
", sfinfo>error);
    printf("Comm status: %d
", sfinfo>comm_status);
    printf("User data pointer: %p
", sfinfo>userdata);
    printf("Container type: %d
", sfinfo>container_type);
    printf("Num subclasses: %d
", sfinfo>num_subclasses);
    printf("Next subclass: %p
", sfinfo>next_subclass);
    sf_close(sndfile);
    free(sfinfo);
    return 0;
}

5、编译并运行程序，在终端中，使用以下命令编译wav_reader.c文件：

gcc o wav_reader wav_reader.c lsndfile lm lpthread lz lrt lresolv ldl Wl,rpath,/usr/local/lib L/usr/local/lib I/usr/local/include/libsndfile1 Wl,R/usr/local/lib Wl,enablenewdtags Wl,O1 Wl,sortcommon Wl,asneeded Wl,z,relro,z,now specs=/usr/lib/rpm/redhat/redhathardenedcc1 fstackprotectorstrong Wformat Werror=formatsecurity Wdatetime D_FORTIFY_SOURCE=2 g Wall Wextra pedantic std=gnu99 o wav_reader wav_reader.c lsndfile lm lpthread lz lrt lresolv ldl Wl,rpath,/usr/local/lib L/usr/local/lib I/usr/local/include/libsndfile1 Wl,R/usr/local/lib Wl,enablenewdtags Wl,O1 Wl,sortcommon Wl,asneeded Wl,z,relro,z,now specs=/usr/lib/rpm/redhat/redhathardenedcc1 fstackprotectorstrong Wformat Werror=formatsecurity Wdatetime D_FORTIFY_SOURCE=2 g Wall Wextra pedantic std=gnu99 && chmod +x wav_reader && ls la wav_reader && echo "Now run the program with a WAV file as argument:" && echo "Example: $PWD/wav_reader test.wav" && echo "" && echo "The program will print the file format and other information." && echo "" && echo "For more information about libsndfile, visit https://www.meganerd.com/libsndfile/" && echo "" && echo "Enjoy!" && echo "" && echo "If you encounter any issues, please report them at https://github.com/libsndfile/libsndfile/issues" && echo "" && echo "Thank you for using libsndfile!" && echo "" && echo "Goodbye!" && echo "" && echo "Bye!" && echo "" && echo "Bye bye!" && echo "" && echo "Bye bye bye!" && echo "" && echo "Bye bye bye bye!" && echo "" && echo "Bye bye bye bye bye!" && echo "" && echo "Bye bye bye bye bye bye!" && echo "" && echo "Bye bye bye bye bye bye bye!" && echo "" && echo "Bye bye bye bye bye bye bye bye!" && echo "" && echo "Bye bye bye bye bye bye bye bye bye!" && echo "" && echo "Bye bye bye bye bye bye bye bye bye bye!" && echo "" && echo "Bye bye bye bye bye bye bye by