我正在尝试用 C 编写一个程序,将捕获的Raw 16kHz PCM 16 位文件转换为16 位 WAV。
我读过一些帖子,有人推荐使用libsox
. 安装它,现在我真的很难理解手册页。
到目前为止(通过阅读源 dist 中的示例)我发现structs
:
- sox_format_t
- sox_signalinfo_t
大概可以用来描述我输入的数据。如果有必要,我也知道我正在处理多少信息(时间)?
一些指导表示赞赏!
好吧,问题得到了解答。但是,我将在此处发布代码,以便人们可以对其进行分析或仅在自己的项目中使用它。
“simonc”和“Nickolay O”提供的链接。被使用了。在网络上搜索有关各个字段的更多信息。
struct wavfile
{
char id[4]; // should always contain "RIFF"
int totallength; // total file length minus 8
char wavefmt[8]; // should be "WAVEfmt "
int format; // 16 for PCM format
short pcm; // 1 for PCM format
short channels; // channels
int frequency; // sampling frequency, 16000 in this case
int bytes_per_second;
short bytes_by_capture;
short bits_per_sample;
char data[4]; // should always contain "data"
int bytes_in_data;
};
//Writes a header to a file that has been opened (take heed that the correct flags
//must've been used. Binary mode required, then you should choose whether you want to
//append or overwrite current file
void write_wav_header(char* name, int samples, int channels){
struct wavfile filler;
FILE *pFile;
strcpy(filler.id, "RIFF");
filler.totallength = (samples * channels) + sizeof(struct wavfile) - 8; //81956
strcpy(filler.wavefmt, "WAVEfmt ");
filler.format = 16;
filler.pcm = 1;
filler.channels = channels;
filler.frequency = 16000;
filler.bits_per_sample = 16;
filler.bytes_per_second = filler.channels * filler.frequency * filler.bits_per_sample/8;
filler.bytes_by_capture = filler.channels*filler.bits_per_sample/8;
filler.bytes_in_data = samples * filler.channels * filler.bits_per_sample/8;
strcpy(filler.data, "data");
pFile = fopen(name, "wb");
fwrite(&filler, 1, sizeof(filler), pFile);
fclose(pFile);
}
我建议手动编写 WAV 标头和数据,PCM 非常简单: https ://web.archive.org/web/20080706175634/https://ccrma.stanford.edu/courses/422/projects/WaveFormat /
更新:原始链接https://ccrma.stanford.edu/courses/422/projects/WaveFormat/失效。