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