Доброго времени суток!
Есть задача считать заголовок WAV файла и представить данные в читабельной форме.
У меня есть вот такой вод код:
| Код |
#include <stdio.h>
#include <stdlib.h>
typedef struct WAV_HEADER
{
char RIFF[4]; /* RIFF Header */
unsigned long ChunkSize; /* RIFF Chunk Size */
char WAVE[4]; /* WAVE Header */
char fmt[4]; /* FMT header */
unsigned long Subchunk1Size; /* Size of the fmt chunk */
unsigned short AudioFormat; // Audio format 1=PCM
unsigned short NumOfChan; /* Number of channels 1=Mono 2=Sterio */
unsigned long SamplesPerSec; /* Sampling Frequency in Hz */
unsigned long bytesPerSec; /* bytes per second */
unsigned short blockAlign; /* 2=16-bit mono, 4=16-bit stereo */
unsigned short bitsPerSample; /* Number of bits per sample */
char Subchunk2ID[4]; /* "Data" string */
unsigned long Subchunk2Size; /* Sampled data length */
}wav_hdr;
/* Function prototypes */
int getFileSize(FILE *inFile);
int main(int argc,char *argv[])
{
wav_hdr wavHeader;
FILE *wavFile;
int headerSize = sizeof(wav_hdr),filelength = 0;
wavFile = fopen("/WAV/welcome.wav","r");
if(wavFile == NULL)
{
printf("Can not able to open wave file\n");
exit(EXIT_FAILURE);
}
fread(&wavHeader,headerSize,1,wavFile);
filelength = getFileSize(wavFile);
fclose(wavFile);
printf("File is %d bytes.\n",filelength);
printf("RIFF header :%c%c%c%c\n",wavHeader.RIFF[0],wavHeader.RIFF[1],wavHeader.RIFF[2],wavHeader.RIFF[3]);
printf("WAVE header :%c%c%c%c\n",wavHeader.WAVE[0],wavHeader.WAVE[1],wavHeader.WAVE[2],wavHeader.WAVE[3]);
printf("FMT :%c%c%c%c\n",wavHeader.fmt[0],wavHeader.fmt[1],wavHeader.fmt[2],wavHeader.fmt[3]);
printf("Data size (based on bits used) :%ld\n",wavHeader.ChunkSize);
// Display the sampling Rate form the header
printf("Sampling Rate :%ld\n",wavHeader.SamplesPerSec); //Sampling frequency of the wav file
printf("Number of bits used :%d\n",wavHeader.bitsPerSample); //Number of bits used per sample
printf("Number of channels :%d\n",wavHeader.bitsPerSample); //Number of channels (mono=1/sterio=2)
printf("Number of bytes per second :%ld\n",wavHeader.bytesPerSec); //Number of bytes per second
printf("Data length :%ld\n",wavHeader.Subchunk2Size);
getchar();
}
/* find the file size */
int getFileSize(FILE *inFile)
{
int fileSize = 0;
fseek(inFile,0,SEEK_END);
fileSize=ftell(inFile);
fseek(inFile,0,SEEK_SET);
return fileSize;
}
|
В результате данные получаю частично корректные:
File is 260028 bytes.
RIFF header :RIFF
WAVE header :
FMT :
Data size (based on bits used) :2338614392529502551
Sampling Rate :259984
Number of bits used :1
Number of channels :1
Number of bytes per second :0
Data length :562958543421441
Подскажите, что не так в коде. Программирую под Mac OS в Xcode... |
)
А ещё проверить sizeof встроенных типов... Может, там long 64-битный...
Ну когда всё успевает)))