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wavread.cpp
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C/C++ Source or Header
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1999-07-26
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300 lines
//-----------------------------------------------------------------------------
// File: WavRead.cpp
//
// Desc: Wave file support for loading and playing Wave files using DirectSound
// buffers.
//
// Copyright (c) 1999 Microsoft Corp. All rights reserved.
//-----------------------------------------------------------------------------
#include <windows.h>
#include "WavRead.h"
//-----------------------------------------------------------------------------
// Defines, constants, and global variables
//-----------------------------------------------------------------------------
#define SAFE_DELETE(p) { if(p) { delete (p); (p)=NULL; } }
#define SAFE_RELEASE(p) { if(p) { (p)->Release(); (p)=NULL; } }
//-----------------------------------------------------------------------------
// Name: ReadMMIO()
// Desc: Support function for reading from a multimedia I/O stream
//-----------------------------------------------------------------------------
HRESULT ReadMMIO( HMMIO hmmioIn, MMCKINFO* pckInRIFF, WAVEFORMATEX** ppwfxInfo )
{
MMCKINFO ckIn; // chunk info. for general use.
PCMWAVEFORMAT pcmWaveFormat; // Temp PCM structure to load in.
*ppwfxInfo = NULL;
if( ( 0 != mmioDescend( hmmioIn, pckInRIFF, NULL, 0 ) ) )
return E_FAIL;
if( (pckInRIFF->ckid != FOURCC_RIFF) ||
(pckInRIFF->fccType != mmioFOURCC('W', 'A', 'V', 'E') ) )
return E_FAIL;
// Search the input file for for the 'fmt ' chunk.
ckIn.ckid = mmioFOURCC('f', 'm', 't', ' ');
if( 0 != mmioDescend(hmmioIn, &ckIn, pckInRIFF, MMIO_FINDCHUNK) )
return E_FAIL;
// Expect the 'fmt' chunk to be at least as large as <PCMWAVEFORMAT>;
// if there are extra parameters at the end, we'll ignore them
if( ckIn.cksize < (LONG) sizeof(PCMWAVEFORMAT) )
return E_FAIL;
// Read the 'fmt ' chunk into <pcmWaveFormat>.
if( mmioRead( hmmioIn, (HPSTR) &pcmWaveFormat,
sizeof(pcmWaveFormat)) != sizeof(pcmWaveFormat) )
return E_FAIL;
// Allocate the waveformatex, but if its not pcm format, read the next
// word, and thats how many extra bytes to allocate.
if( pcmWaveFormat.wf.wFormatTag == WAVE_FORMAT_PCM )
{
if( NULL == ( *ppwfxInfo = new WAVEFORMATEX ) )
return E_FAIL;
// Copy the bytes from the pcm structure to the waveformatex structure
memcpy( *ppwfxInfo, &pcmWaveFormat, sizeof(pcmWaveFormat) );
(*ppwfxInfo)->cbSize = 0;
}
else
{
// Read in length of extra bytes.
WORD cbExtraBytes = 0L;
if( mmioRead( hmmioIn, (CHAR*)&cbExtraBytes, sizeof(WORD)) != sizeof(WORD) )
return E_FAIL;
*ppwfxInfo = (WAVEFORMATEX*)new CHAR[ sizeof(WAVEFORMATEX) + cbExtraBytes ];
if( NULL == *ppwfxInfo )
return E_FAIL;
// Copy the bytes from the pcm structure to the waveformatex structure
memcpy( *ppwfxInfo, &pcmWaveFormat, sizeof(pcmWaveFormat) );
(*ppwfxInfo)->cbSize = cbExtraBytes;
// Now, read those extra bytes into the structure, if cbExtraAlloc != 0.
if( mmioRead( hmmioIn, (CHAR*)(((BYTE*)&((*ppwfxInfo)->cbSize))+sizeof(WORD)),
cbExtraBytes ) != cbExtraBytes )
{
delete *ppwfxInfo;
*ppwfxInfo = NULL;
return E_FAIL;
}
}
// Ascend the input file out of the 'fmt ' chunk.
if( 0 != mmioAscend( hmmioIn, &ckIn, 0 ) )
{
delete *ppwfxInfo;
*ppwfxInfo = NULL;
return E_FAIL;
}
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: WaveOpenFile()
// Desc: This function will open a wave input file and prepare it for reading,
// so the data can be easily read with WaveReadFile. Returns 0 if
// successful, the error code if not.
//-----------------------------------------------------------------------------
HRESULT WaveOpenFile( CHAR* strFileName, HMMIO* phmmioIn, WAVEFORMATEX** ppwfxInfo,
MMCKINFO* pckInRIFF )
{
HRESULT hr;
HMMIO hmmioIn = NULL;
if( NULL == ( hmmioIn = mmioOpen( strFileName, NULL, MMIO_ALLOCBUF|MMIO_READ ) ) )
return E_FAIL;
if( FAILED( hr = ReadMMIO( hmmioIn, pckInRIFF, ppwfxInfo ) ) )
{
mmioClose( hmmioIn, 0 );
return hr;
}
*phmmioIn = hmmioIn;
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: WaveStartDataRead()
// Desc: Routine has to be called before WaveReadFile as it searches for the
// chunk to descend into for reading, that is, the 'data' chunk. For
// simplicity, this used to be in the open routine, but was taken out and
// moved to a separate routine so there was more control on the chunks
// that are before the data chunk, such as 'fact', etc...
//-----------------------------------------------------------------------------
HRESULT WaveStartDataRead( HMMIO* phmmioIn, MMCKINFO* pckIn,
MMCKINFO* pckInRIFF )
{
// Seek to the data
if( -1 == mmioSeek( *phmmioIn, pckInRIFF->dwDataOffset + sizeof(FOURCC),
SEEK_SET ) )
return E_FAIL;
// Search the input file for for the 'data' chunk.
pckIn->ckid = mmioFOURCC('d', 'a', 't', 'a');
if( 0 != mmioDescend( *phmmioIn, pckIn, pckInRIFF, MMIO_FINDCHUNK ) )
return E_FAIL;
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: WaveReadFile()
// Desc: Reads wave data from the wave file. Make sure we're descended into
// the data chunk before calling this function.
// hmmioIn - Handle to mmio.
// cbRead - # of bytes to read.
// pbDest - Destination buffer to put bytes.
// cbActualRead - # of bytes actually read.
//-----------------------------------------------------------------------------
HRESULT WaveReadFile( HMMIO hmmioIn, UINT cbRead, BYTE* pbDest,
MMCKINFO* pckIn, UINT* cbActualRead )
{
MMIOINFO mmioinfoIn; // current status of <hmmioIn>
*cbActualRead = 0;
if( 0 != mmioGetInfo( hmmioIn, &mmioinfoIn, 0 ) )
return E_FAIL;
UINT cbDataIn = cbRead;
if( cbDataIn > pckIn->cksize )
cbDataIn = pckIn->cksize;
pckIn->cksize -= cbDataIn;
for( DWORD cT = 0; cT < cbDataIn; cT++ )
{
// Copy the bytes from the io to the buffer.
if( mmioinfoIn.pchNext == mmioinfoIn.pchEndRead )
{
if( 0 != mmioAdvance( hmmioIn, &mmioinfoIn, MMIO_READ ) )
return E_FAIL;
if( mmioinfoIn.pchNext == mmioinfoIn.pchEndRead )
return E_FAIL;
}
// Actual copy.
*((BYTE*)pbDest+cT) = *((BYTE*)mmioinfoIn.pchNext);
mmioinfoIn.pchNext++;
}
if( 0 != mmioSetInfo( hmmioIn, &mmioinfoIn, 0 ) )
return E_FAIL;
*cbActualRead = cbDataIn;
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: CWaveSoundRead()
// Desc: Constructs the class
//-----------------------------------------------------------------------------
CWaveSoundRead::CWaveSoundRead()
{
m_pwfx = NULL;
}
//-----------------------------------------------------------------------------
// Name: ~CWaveSoundRead()
// Desc: Destructs the class
//-----------------------------------------------------------------------------
CWaveSoundRead::~CWaveSoundRead()
{
Close();
SAFE_DELETE( m_pwfx );
}
//-----------------------------------------------------------------------------
// Name: Open()
// Desc: Opens a wave file for reading
//-----------------------------------------------------------------------------
HRESULT CWaveSoundRead::Open( CHAR* strFilename )
{
SAFE_DELETE( m_pwfx );
HRESULT hr;
if( FAILED( hr = WaveOpenFile( strFilename, &m_hmmioIn, &m_pwfx, &m_ckInRiff ) ) )
return hr;
if( FAILED( hr = Reset() ) )
return hr;
return hr;
}
//-----------------------------------------------------------------------------
// Name: Reset()
// Desc: Resets the internal m_ckIn pointer so reading starts from the
// beginning of the file again
//-----------------------------------------------------------------------------
HRESULT CWaveSoundRead::Reset()
{
return WaveStartDataRead( &m_hmmioIn, &m_ckIn, &m_ckInRiff );
}
//-----------------------------------------------------------------------------
// Name: Read()
// Desc: Reads a wave file into a pointer and returns how much read
// using m_ckIn to determine where to start reading from
//-----------------------------------------------------------------------------
HRESULT CWaveSoundRead::Read( UINT nSizeToRead, BYTE* pbData, UINT* pnSizeRead )
{
return WaveReadFile( m_hmmioIn, nSizeToRead, pbData, &m_ckIn, pnSizeRead );
}
//-----------------------------------------------------------------------------
// Name: Close()
// Desc: Closes an open wave file
//-----------------------------------------------------------------------------
HRESULT CWaveSoundRead::Close()
{
mmioClose( m_hmmioIn, 0 );
return S_OK;
}