C 更改wav文件的samplerate和byterate而不会在打开文件时遇到问题?
我试图将一个503196字节的wav文件的内容写入另一个文件,并将samplerate/byterate加倍,以使速度加倍。但是,我在从输入文件读取数据并将其写入输出文件时遇到问题。这是我的密码:C 更改wav文件的samplerate和byterate而不会在打开文件时遇到问题?,c,audio,wav,alter,tweak,C,Audio,Wav,Alter,Tweak,我试图将一个503196字节的wav文件的内容写入另一个文件,并将samplerate/byterate加倍,以使速度加倍。但是,我在从输入文件读取数据并将其写入输出文件时遇到问题。这是我的密码: #include <stdio.h> int main() { struct WAVE { char ChunkID[4]; unsigned int ChunkSize; char Format[4];
#include <stdio.h>
int main() {
struct WAVE {
char ChunkID[4];
unsigned int ChunkSize;
char Format[4];
char Subchunk1ID[4];
unsigned int Subchunk1Size;
unsigned short int AudioFormat;
unsigned short int NumChannels;
unsigned int SampleRate;
unsigned int ByteRate;
unsigned short int BlockAlign;
unsigned short int BitsPerSample;
char Subchunk2ID[4];
unsigned int Subchunk2Size;
} wav;
FILE *original, *fast;
original = fopen("Alejandro_project.wav", "rb");
fast = fopen("Alejandro_fast.wav", "wb");
if (original == NULL) {
printf("File does not exist.\n");
return 0;
}
fread(&wav, 1, 44, original);
unsigned short int data[12 * wav.SampleRate]
int i;
for (i = 0; i < Subchunk2Size / 2; i++)
fread(&data[i], 1, 2, original);
fwrite(&wav, 1, 44, fast);
unsigned int fastSampleRate = wav.SampleRate * 2;
unsigned int fastByteRate = 2 * fastSampleRate;
fseek(fast, 24, SEEK_SET);
fwrite(&fastSampleRate, 4, 1, fast);
fseek(fast, 28, SEEK_SET);
fwrite(&fastByteRate, 4, 1, fast);
fwrite(data, 1, 2, original);
fclose(fast);
fclose(original);
}
#包括
int main(){
结构波{
char ChunkID[4];
无符号整数块大小;
字符格式[4];
char Subchunk1ID[4];
无符号整数分块大小;
无符号短整数音频格式;
无符号短整数通道;
无符号整数采样器;
无符号整数字节;
无符号短整型块对齐;
无符号短整数位样本;
char Subchunk2ID[4];
无符号整数分块大小;
}wav;
文件*原件,*快速;
原件=fopen(“Alejandro_project.wav”、“rb”);
fast=fopen(“Alejandro_fast.wav”、“wb”);
如果(原始==NULL){
printf(“文件不存在。\n”);
返回0;
}
fread(和wav,1,44,原件);
无符号短整数数据[12*wav.SampleRate]
int i;
对于(i=0;i
有几个问题。。对于初学者,您需要确保WAVE标头的结构已打包,这样结构中就不会出现意外的填充,从而使某些字段错位并增加结构的大小。否则,在每个unsigned short int
成员之后可能会有两个字节的额外填充
#pragma pack(push,1) /* for VC, may also work for GCC */
struct WAVE {
/* ...struct contents... */
} wav;
#pragma pack(pop)
其次,看起来您只是试图覆盖新文件中的SampleRate和ByteRate成员,而其余成员保持不变。仅当新文件已经是旧文件的副本时,此操作才有效。如果是这样,您还需要将打开新文件的模式改为“r+b”(读模式+写模式),而不是“wb”(写模式),这样现有的文件内容就不会被丢弃
尝试写入标头时也会出现错误。这一行:
fread(original, 1, 44, fast);
应该是:
fwrite(&wav, 44, 1, fast);
从wav
向新文件写入44个字节,而不是从新文件读取并使用旧文件的文件*
作为目标
如果新文件不是旧文件的副本,则还需要复制文件的其余部分(包括头的其他部分)。在这种情况下,可能最容易(打开文件后):
wav
fread(&wav, sizeof(wav), 1, original);
SampleRate
和ByteRate
字段
wav.SampleRate *= 2;
wav.ByteRate *= 2;
wav
头写入新文件
fwrite(&wav, sizeof(wav), 1, fast);
char buf[1024];
int count;
while ((count = fread(buf, 1, sizeof(buf), original)) > 0)
fwrite(buf, 1, count, fast);
…然后关闭文件并返回。我找到了答案。我删除了结构只是为了看看我在做什么。一旦我完成了最后一个项目,我就要把这个结构合并回去
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
FILE *original, *fast, *slow, *slowdown;
unsigned int ChunkSize, Subchunk1Size, Subchunk2Size, RIFFSize, fmtSize, dataSize, SampleRate, ByteRate;
unsigned short int AudioFormat, NumChannels, BlockAlign, BitsPerSample;
char ChunkID[5], Format[5], Subchunk1ID[5], Subchunk2ID[5];
ChunkID[4] = '\0';
Format[4] = '\0';
Subchunk1ID[4] = '\0';
Subchunk2ID[4] = '\0';
char path[FILENAME_MAX], dfast[FILENAME_MAX], dslow[FILENAME_MAX], dslowdown[FILENAME_MAX];
printf("Enter path to Alejandro_project.wav file: ");
scanf("%s", path);
strcpy(dfast, path);
dfast[strlen(path) - 21] = '\0';
strcpy(dslow, dfast);
strcpy(dslowdown, dslow);
strcat(dfast, "Alejandro_fast.wav");
strcat(dslow, "Alejandro_slow.wav");
strcat(dslowdown, "Alejandro_slowdown.wav");
original = fopen(path, "rb");
if (!original) {
printf("Error: file does not exist.\n");
return EXIT_FAILURE;
}
fread(ChunkID, 4, 1, original);
fread(&ChunkSize, 4, 1, original);
fread(Format, 4, 1, original);
fread(Subchunk1ID, 4, 1, original);
fread(&Subchunk1Size, 4, 1, original);
fread(&AudioFormat, 2, 1, original);
fread(&NumChannels, 2, 1, original);
fread(&SampleRate, 4, 1, original);
fread(&ByteRate, 4, 1, original);
fread(&BlockAlign, 2, 1, original);
fread(&BitsPerSample, 2, 1, original);
fread(Subchunk2ID, 4, 1, original);
fread(&Subchunk2Size, 4, 1, original);
fmtSize = Subchunk1Size + 8;
dataSize = Subchunk2Size + 8;
RIFFSize = ChunkSize + 8 - (fmtSize + dataSize);
printf("RIFF Size: %d\n", RIFFSize);
printf("fmt Size: %d\n", fmtSize);
printf("data Size: %d\n\n", dataSize);
printf("ChunkID: %s\n", ChunkID);
printf("ChunkSize: %d\n", ChunkSize);
printf("Format: %s\n\n", Format);
printf("Subchunk1ID: %s\n", Subchunk1ID);
printf("Subchunk1Size: %d\n", Subchunk1Size);
printf("AudioFormat: %d\n", AudioFormat);
printf("NumChannels: %d\n", NumChannels);
printf("SampleRate: %d\n", SampleRate);
printf("ByteRate: %d\n", ByteRate);
printf("BlockAlign: %d\n", BlockAlign);
printf("BitsPerSample: %d\n\n", BitsPerSample);
printf("Subchunk2ID: %s\n", Subchunk2ID);
printf("Subchunk2Size: %d\n", Subchunk2Size);
fseek(original, 0, SEEK_SET);
fast = fopen(dfast, "wb");
unsigned int fastSampleRate = SampleRate * 2;
unsigned int fastByteRate = 2 * fastSampleRate;
fwrite(ChunkID, 4, 1, fast);
fwrite(&ChunkSize, 4, 1, fast);
fwrite(Format, 4, 1, fast);
fwrite(Subchunk1ID, 4, 1, fast);
fwrite(&Subchunk1Size, 4, 1, fast);
fwrite(&AudioFormat, 2, 1, fast);
fwrite(&NumChannels, 2, 1, fast);
fwrite(&fastSampleRate, 4, 1, fast);
fwrite(&fastByteRate, 4, 1, fast);
fwrite(&BlockAlign, 2, 1, fast);
fwrite(&BitsPerSample, 2, 1, fast);
fwrite(Subchunk2ID, 4, 1, fast);
fwrite(&Subchunk2Size, 4, 1, fast);
short int data;
unsigned int i;
for (i = 0; i < Subchunk2Size / 2; i++) {
fread(&data, 2, 1, original);
fwrite(&data, 2, 1, fast);
}
fclose(fast);
fseek(original, 0, SEEK_SET);
slow = fopen(dslow, "wb");
unsigned int slowSampleRate = SampleRate / 2;
unsigned int slowByteRate = 2 * slowSampleRate;
fwrite(ChunkID, 4, 1, slow);
fwrite(&ChunkSize, 4, 1, slow);
fwrite(Format, 4, 1, slow);
fwrite(Subchunk1ID, 4, 1, slow);
fwrite(&Subchunk1Size, 4, 1, slow);
fwrite(&AudioFormat, 2, 1, slow);
fwrite(&NumChannels, 2, 1, slow);
fwrite(&slowSampleRate, 4, 1, slow);
fwrite(&slowByteRate, 4, 1, slow);
fwrite(&BlockAlign, 2, 1, slow);
fwrite(&BitsPerSample, 2, 1, slow);
fwrite(Subchunk2ID, 4, 1, slow);
fwrite(&Subchunk2Size, 4, 1, slow);
for (i = 0; i < Subchunk2Size / 2; i++) {
fread(&data, 2, 1, original);
fwrite(&data, 2, 1, slow);
}
fclose(slow);
fclose(original);
system("pause");
return EXIT_SUCCESS;
}
#包括
#包括
#包括
int main(){
文件*原始,*快,*慢,*慢;
unsigned int ChunkSize、Subchunk1Size、Subchunk2Size、RIFFSize、fmtSize、dataSize、SampleRate、ByteRate;
无符号短整数音频格式、数字通道、块对齐、位采样;
char ChunkID[5],Format[5],Subchunk1ID[5],Subchunk2ID[5];
ChunkID[4]='\0';
格式[4]='\0';
子chunk1id[4]='\0';
Subchunk2ID[4]='\0';
char path[FILENAME\u MAX]、dfast[FILENAME\u MAX]、dslow[FILENAME\u MAX]、dslowdown[FILENAME\u MAX];
printf(“输入Alejandro_project.wav文件的路径:”);
scanf(“%s”,路径);
strcpy(dfast,path);
dfast[strlen(path)-21]='\0';
strcpy(dslow,dfast);
strcpy(dslowdown,dslow);
strcat(dfast,“Alejandro_fast.wav”);
strcat(dslow,“Alejandro_slow.wav”);
strcat(dslowdown,“Alejandro_delow.wav”);
原始=fopen(路径,“rb”);
如果(!原件){
printf(“错误:文件不存在。\n”);
返回退出失败;
}
fread(ChunkID,4,1,原件);
fread(和ChunkSize,4,1,原件);
fread(格式4,1,原件);
fread(分包商ID,4,1,原件);
fread(尺寸为4号和1号的分块原版);
fread(音频格式,2,1,原件);
fread(和NumChannels,2,1,原件);
fread(和采样器,4,1,原件);
fread(&ByteRate,4,1,原件);
fread(和BlockAlign,2,1,原件);
fread(&BitsPerSample,2,1,原件);
fread(第4、1子块,原件);
fread(尺寸为4号和1号的分块原版);
fmtSize=次弹簧尺寸+8;
数据大小=子块大小+8;
RIFFSize=ChunkSize+8-(fmtSize+dataSize);
printf(“RIFF大小:%d\n”,RIFFSize);
printf(“fmt大小:%d\n”,fmt大小);
printf(“数据大小:%d\n\n”,数据大小);
printf(“ChunkID:%s\n”,ChunkID);
printf(“ChunkSize:%d\n”,ChunkSize);
printf(“格式:%s\n\n”,格式);
printf(“子chunk1id:%s\n”,子chunk1id);
printf(“Subchunk1Size:%d\n”,Subchunk1Size);
printf(“音频格式:%d\n”,音频格式);
printf(“NumChannels:%d\n”,NumChannels);
printf(“采样器:%d\n”,采样器);
printf(“字节:%d\n”,字节);
printf(“块对齐:%d\n”,块对齐);
printf(“BitsPerSample:%d\n\n”,BitsPerSample);
printf(“Subchunk2ID:%s\n”,Subchunk2ID);
printf(“Subchunk2Size:%d\n”,Subchunk2Size);
fseek(原始,0,搜索集);
fast=fopen(dfast,“wb”);
unsigned int fastSampleRate=SampleRate*2;
无符号整数f