Since
this topic seems to have shifted focus, I thought it might be more useful to post on this forum.
What I'm trying to do is load a WAV file into memory so that I can play it back using DirectSound. To do this, I read in the header information for the file and then try to read in the sound data... which is where I fail.
I've gone into fread( ) itself and looked at what it is doing and it seems to read only 6 bytes and then just gives up. When it requests the next segment from the hard disk, it seems to be receiving nothing. I know for a fact that the file is not at it's end, yet fread just quits.
Here is the code for the loading of the sound file. It is based on the article here on Gamedev.net:
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
SNDFILE *readWav(char *file_name)
{
FILE *fp = NULL;
fp = fopen(file_name,"r");
if (!fp) //Make sure the file was found
return NULL;
unsigned char id[4]; //four bytes to hold identifiers ('RIFF','WAVE','fmt ','data');
unsigned long size; //32 bit value to hold file size
unsigned long format_length;//Length of format header; Should be 16
fread(id, sizeof(unsigned char), 4, fp); //read in first four bytes
if (strncmp((const char *)id, "RIFF",4))
return NULL;
fread(&size, sizeof(unsigned long), 1, fp); //read in 32bit size value
fread(id, sizeof(unsigned char), 4, fp); //read in 4 byte string
if (strncmp((const char *)id,"WAVE",4))
return NULL;
fread(id, sizeof(unsigned char), 4, fp); //read in 4 bytes "fmt ";
if(strncmp((const char *)id, "fmt ",4))
return NULL;
SNDFILE *tmp = (SNDFILE *) malloc(sizeof(SNDFILE));
fread(&format_length, sizeof(unsigned long),1,fp); //Should be 16
fread(&tmp->wfrmt.wFormatTag, sizeof(short), 1, fp);//Should always be WAVE_FORMAT_PCM
fread(&tmp->wfrmt.nChannels, sizeof(short),1,fp); //1 mono, 2 stereo
fread(&tmp->wfrmt.nSamplesPerSec, sizeof(unsigned long), 1, fp); //like 44100, 22050, etc...
fread(&tmp->wfrmt.nAvgBytesPerSec, sizeof(unsigned long), 1, fp); //Average Bytes per second
fread(&tmp->wfrmt.nBlockAlign, sizeof(short), 1, fp); //nChannels * BytesPerSample
fread(&tmp->wfrmt.wBitsPerSample, sizeof(short), 1, fp); //8 bit or 16 bit file?
tmp->wfrmt.cbSize = 0;
fread(id, sizeof(unsigned char), 4, fp); //read in identifier 'data'
if(strncmp((const char *)id, "data",4))
{
free(tmp);
return NULL;
}
int bytes_read; // Used to check how many bytes fread read
fread(&tmp->size, sizeof(unsigned long), 1, fp); //how many bytes of sound data do we have
tmp->buffer = (unsigned char *) malloc (sizeof(unsigned char) * tmp->size); //set aside sound buffer space
//for(int i=0; i<(int)tmp->size; i++)
//tmp->buffer = (unsigned char) rand()%256;
//tmp->buffer=fgetc(fp);
/*!!!FAILURE ON NEXT STEP!!!*/
bytes_read = fread(tmp->buffer, sizeof(unsigned char), tmp->size, fp); //read in our whole sound data chunk
fclose(fp);
FILE *out; // Test file to see what the buffer read
out = fopen("Out.txt","w+");
fwrite(tmp->buffer,sizeof(unsigned char),tmp->size,out);
fclose(out);
return tmp;
}
And here is the definition of SNDFILE:
typedef struct{
WAVEFORMATEX wfrmt;
unsigned long size;
unsigned char *buffer;
}SNDFILE;
Thanks for reading :)
