AppleWin/source/Riff.cpp

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/*
AppleWin : An Apple //e emulator for Windows
Copyright (C) 1994-1996, Michael O'Brien
Copyright (C) 1999-2001, Oliver Schmidt
Copyright (C) 2002-2005, Tom Charlesworth
Copyright (C) 2006-2007, Tom Charlesworth, Michael Pohoreski
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AppleWin is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
AppleWin is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with AppleWin; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Description: RIFF funcs
*
* Author: Various
*/
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#include "Stdafx.h"
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#include "Riff.h"
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static HANDLE g_hRiffFile = INVALID_HANDLE_VALUE;
static DWORD dwTotalOffset;
static DWORD dwDataOffset;
static DWORD g_dwTotalNumberOfBytesWritten = 0;
static unsigned int g_NumChannels = 2;
int RiffInitWriteFile(char* pszFile, unsigned int sample_rate, unsigned int NumChannels)
{
g_hRiffFile = CreateFile(pszFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if(g_hRiffFile == INVALID_HANDLE_VALUE)
return 1;
g_NumChannels = NumChannels;
//
UINT32 temp32;
UINT16 temp16;
DWORD dwNumberOfBytesWritten;
WriteFile(g_hRiffFile, "RIFF", 4, &dwNumberOfBytesWritten, NULL);
temp32 = 0; // total size
dwTotalOffset = SetFilePointer(g_hRiffFile, 0, NULL, FILE_CURRENT);
WriteFile(g_hRiffFile, &temp32, 4, &dwNumberOfBytesWritten, NULL);
WriteFile(g_hRiffFile, "WAVE", 4, &dwNumberOfBytesWritten, NULL);
//
WriteFile(g_hRiffFile, "fmt ", 4, &dwNumberOfBytesWritten, NULL);
temp32 = 16; // format length
WriteFile(g_hRiffFile, &temp32, 4, &dwNumberOfBytesWritten, NULL);
temp16 = 1; // PCM format
WriteFile(g_hRiffFile, &temp16, 2, &dwNumberOfBytesWritten, NULL);
temp16 = NumChannels; // channels
WriteFile(g_hRiffFile, &temp16, 2, &dwNumberOfBytesWritten, NULL);
temp32 = sample_rate; // sample rate
WriteFile(g_hRiffFile, &temp32, 4, &dwNumberOfBytesWritten, NULL);
temp32 = sample_rate * 2 * NumChannels; // bytes/second
WriteFile(g_hRiffFile, &temp32, 4, &dwNumberOfBytesWritten, NULL);
temp16 = 2 * NumChannels; // block align
WriteFile(g_hRiffFile, &temp16, 2, &dwNumberOfBytesWritten, NULL);
temp16 = 16; // bits/sample
WriteFile(g_hRiffFile, &temp16, 2, &dwNumberOfBytesWritten, NULL);
//
WriteFile(g_hRiffFile, "data", 4, &dwNumberOfBytesWritten, NULL);
temp32 = 0; // data length
dwDataOffset = SetFilePointer(g_hRiffFile, 0, NULL, FILE_CURRENT);
WriteFile(g_hRiffFile, &temp32, 4, &dwNumberOfBytesWritten, NULL);
return 0;
}
int RiffFinishWriteFile()
{
if(g_hRiffFile == INVALID_HANDLE_VALUE)
return 1;
//
UINT32 temp32;
DWORD dwNumberOfBytesWritten;
temp32 = g_dwTotalNumberOfBytesWritten - (dwTotalOffset + 4);
SetFilePointer(g_hRiffFile, dwTotalOffset, NULL, FILE_BEGIN);
WriteFile(g_hRiffFile, &temp32, 4, &dwNumberOfBytesWritten, NULL);
temp32 = g_dwTotalNumberOfBytesWritten - (dwDataOffset + 4);
SetFilePointer(g_hRiffFile, dwDataOffset, NULL, FILE_BEGIN);
WriteFile(g_hRiffFile, &temp32, 4, &dwNumberOfBytesWritten, NULL);
return CloseHandle(g_hRiffFile);
}
int RiffPutSamples(short* buf, unsigned int uSamples)
{
if(g_hRiffFile == INVALID_HANDLE_VALUE)
return 1;
//
DWORD dwNumberOfBytesWritten;
BOOL bRes = WriteFile(
g_hRiffFile,
buf,
uSamples * sizeof(short) * g_NumChannels,
&dwNumberOfBytesWritten,
NULL);
g_dwTotalNumberOfBytesWritten += dwNumberOfBytesWritten;
return 0;
}