50 lines
1,003 B
C
50 lines
1,003 B
C
|
/*
|
||
|
|
riff.c
|
||
|
|
|
||
|
|
This module contains functions which deal with RIFF files
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <windows.h>
|
||
|
|
#include <mmsystem.h>
|
||
|
|
#include "sbtest.h"
|
||
|
|
|
||
|
|
BOOL IsRiffWaveFormat(PUCHAR pView)
|
||
|
|
{
|
||
|
|
PRIFFHDR pHdr;
|
||
|
|
|
||
|
|
pHdr = (PRIFFHDR) pView;
|
||
|
|
|
||
|
|
// validate it's a wave file
|
||
|
|
|
||
|
|
if ((pHdr->rifftag != ckidRIFF)
|
||
|
|
|| (pHdr->wavetag != ckidWAVE)) {
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
PUCHAR FindRiffChunk(PULONG pChunkSize, PUCHAR pView, FOURCC Tag)
|
||
|
|
{
|
||
|
|
PRIFFHDR pHdr;
|
||
|
|
PRIFFCHUNKHDR pChHdr;
|
||
|
|
FOURCC ChTag;
|
||
|
|
ULONG Size;
|
||
|
|
|
||
|
|
pHdr = (PRIFFHDR) pView;
|
||
|
|
Size = pHdr->Size;
|
||
|
|
pView += sizeof(RIFFHDR); // point to the first chunk
|
||
|
|
while (Size) {
|
||
|
|
pChHdr = (PRIFFCHUNKHDR) pView;
|
||
|
|
ChTag = pChHdr->rifftag;
|
||
|
|
if (ChTag == Tag) {
|
||
|
|
*pChunkSize = pChHdr->Size;
|
||
|
|
return pView + sizeof(RIFFCHUNKHDR);
|
||
|
|
}
|
||
|
|
pView += pChHdr->Size + sizeof(RIFFCHUNKHDR);
|
||
|
|
Size -= (pChHdr->Size + sizeof(RIFFCHUNKHDR));
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|