436 lines
9.1 KiB
C++
436 lines
9.1 KiB
C++
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#include "tones.h"
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//////////////////////////////////////////////////////////////////////////////
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//
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// Helper function used to read a wave file's data into an in-memory buffer.
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//
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HRESULT ReadWaveFile(char * szFileName, DWORD dwFileSize, BYTE * pbData)
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{
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const int WAVE_HEADER_SIZE = 44;
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FILE * fp;
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size_t result;
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//
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// Check arguments.
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//
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// Assumption: we are reading at least WAVE_HEADER_SIZE bytes from the file.
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// Note: this is data in addition to the header.
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//
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// _ASSERTE( ! IsBadWritePtr( pbData, dwFileSize ) );
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// _ASSERTE( ! IsBadStringPtr( szFileName, (UINT) -1 ) );
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if ( dwFileSize < WAVE_HEADER_SIZE )
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{
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return E_INVALIDARG;
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}
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//
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// Open the file for reading.
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//
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fp = fopen(szFileName, "rb");
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if ( fp == NULL )
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{
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return E_FAIL;
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}
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//
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// Skip the wave header.
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//
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result = fread(pbData, sizeof(BYTE), WAVE_HEADER_SIZE, fp);
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if ( result != WAVE_HEADER_SIZE )
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{
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fclose(fp);
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return E_FAIL;
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}
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//
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// Read the waveform from the file and close the file.
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//
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result = fread(pbData, sizeof(BYTE), dwFileSize, fp);
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fclose(fp);
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if ( result != dwFileSize )
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{
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return E_FAIL;
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}
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return S_OK;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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CTonePlayer::CTonePlayer()
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{
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m_hWaveOut = NULL;
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m_fInitialized = FALSE;
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m_fDialtonePlaying = FALSE;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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CTonePlayer::~CTonePlayer()
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{
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//
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// We should have closed the wave device by now.
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//
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if ( m_fInitialized == TRUE )
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{
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ASSERT( m_hWaveOut == NULL );
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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HRESULT CTonePlayer::Initialize(void)
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{
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int i;
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//
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// It's wasteful to initialize twice, but it won't break anything.
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//
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ASSERT( m_fInitialized == FALSE );
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//
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// Read all the files.
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//
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HRESULT hr = ReadWaveFile(
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"dialtone.wav",
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WAVE_FILE_SIZE,
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(BYTE * ) & m_abDialtoneWaveform
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);
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if ( FAILED(hr) )
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{
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return hr;
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}
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//
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// For each digit
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//
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for ( i = 0; i < NUM_DIGITS; i ++ )
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{
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//
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// Construct the filename for this digit.
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//
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char szFilename[20];
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if ( i < 10 )
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{
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sprintf(szFilename,"dtmf%d.wav", i);
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}
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else if ( i == 10 )
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{
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sprintf(szFilename,"dtmfstar.wav", i);
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}
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else if ( i == 11 )
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{
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sprintf(szFilename,"dtmfpound.wav", i);
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}
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else
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{
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ASSERT( FALSE );
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}
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//
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// Read the wave file for this digit.
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//
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HRESULT hr = ReadWaveFile(
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szFilename,
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WAVE_FILE_SIZE,
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(BYTE * ) ( & m_abDigitWaveforms ) + ( i * WAVE_FILE_SIZE )
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);
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if ( FAILED(hr) )
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{
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return hr;
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}
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}
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//
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// We can now go ahead with the other methods.
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//
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m_fInitialized = TRUE;
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return S_OK;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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HRESULT CTonePlayer::StartDialtone(
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void
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)
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{
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MMRESULT mmresult;
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if ( m_fInitialized == FALSE )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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if ( m_hWaveOut == NULL )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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//
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// Reset the wave device to flush out any pending buffers.
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//
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waveOutReset( m_hWaveOut );
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//
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// Construct a wave header structure that will indicate what to play
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// in waveOutWrite, and read in the data from the file. This can also
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// be done ahead of time.
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//
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ZeroMemory( & m_WaveHeader, sizeof( m_WaveHeader ) );
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m_WaveHeader.lpData = (LPSTR) & m_abDialtoneWaveform;
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m_WaveHeader.dwBufferLength = WAVE_FILE_SIZE;
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m_WaveHeader.dwFlags = WHDR_BEGINLOOP | WHDR_ENDLOOP;
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m_WaveHeader.dwLoops = (DWORD) -1;
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//
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// Submit the data to the wave device. The wave header indicated that
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// we want to loop. Need to prepare the header first, but it can
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// only be prepared after the device has been opened.
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//
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mmresult = waveOutPrepareHeader(m_hWaveOut,
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& m_WaveHeader,
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sizeof(WAVEHDR)
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);
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if ( mmresult != MMSYSERR_NOERROR )
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{
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return E_FAIL;
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}
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mmresult = waveOutWrite(m_hWaveOut,
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& m_WaveHeader,
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sizeof(WAVEHDR)
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);
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if ( mmresult != MMSYSERR_NOERROR )
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{
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return E_FAIL;
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}
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m_fDialtonePlaying = TRUE;
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return S_OK;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// Reset the device to stop playing.
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//
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HRESULT CTonePlayer::StopDialtone( void )
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{
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if ( m_fInitialized == FALSE )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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if ( m_hWaveOut == NULL )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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waveOutReset( m_hWaveOut );
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m_fDialtonePlaying = FALSE;
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return S_OK;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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HRESULT CTonePlayer::GenerateDTMF(
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long lDigit
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)
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{
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MMRESULT mmresult;
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if ( lDigit < 0 )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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if ( lDigit > NUM_DIGITS )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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if ( m_fInitialized == FALSE )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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if ( m_hWaveOut == NULL )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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//
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// Reset the wave device to flush out any pending buffers.
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//
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waveOutReset( m_hWaveOut );
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m_fDialtonePlaying = FALSE;
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//
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// Construct a wave header structure that will indicate what to play
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// in waveOutWrite, and read in the data from the file. This can also
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// be done ahead of time.
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//
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ZeroMemory( & m_WaveHeader, sizeof( m_WaveHeader ) );
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m_WaveHeader.lpData = (LPSTR) & m_abDigitWaveforms + lDigit * WAVE_FILE_SIZE;
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m_WaveHeader.dwBufferLength = WAVE_FILE_SIZE;
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m_WaveHeader.dwFlags = 0;
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m_WaveHeader.dwLoops = (DWORD) 0;
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//
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// Submit the data to the wave device. The wave header indicated that
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// we want to loop. Need to prepare the header first, but it can
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// only be prepared after the device has been opened.
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//
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mmresult = waveOutPrepareHeader(m_hWaveOut,
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& m_WaveHeader,
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sizeof(WAVEHDR)
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);
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if ( mmresult != MMSYSERR_NOERROR )
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{
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return E_FAIL;
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}
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mmresult = waveOutWrite(m_hWaveOut,
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& m_WaveHeader,
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sizeof(WAVEHDR)
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);
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if ( mmresult != MMSYSERR_NOERROR )
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{
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return E_FAIL;
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}
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return S_OK;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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HRESULT CTonePlayer::OpenWaveDevice(
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long lWaveID
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)
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{
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MMRESULT mmresult;
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if ( m_fInitialized == FALSE )
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{
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ASSERT( FALSE );
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return E_UNEXPECTED;
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}
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//
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// We expect that the wave device will not be opened twice. This is
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// dependent on the calling code.
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//
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ASSERT( m_hWaveOut == NULL );
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//
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// Open the wave device. Here we specify a hard-coded audio format.
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//
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WAVEFORMATEX waveFormat;
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waveFormat.wFormatTag = WAVE_FORMAT_PCM; // linear PCM
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waveFormat.nChannels = 1; // mono
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waveFormat.nSamplesPerSec = 8000; // 8 KHz
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waveFormat.wBitsPerSample = 16; // 16-bit samples
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waveFormat.nBlockAlign = waveFormat.nChannels * waveFormat.wBitsPerSample / 8;
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waveFormat.nAvgBytesPerSec = waveFormat.nSamplesPerSec * waveFormat.nBlockAlign;
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waveFormat.cbSize = 0; // no extra format info
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mmresult = waveOutOpen(& m_hWaveOut, // returned handle
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lWaveID, // which device to use
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&waveFormat, // wave format to use
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0, // callback function pointer
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0, // callback instance data
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WAVE_FORMAT_DIRECT // we don't want ACM
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);
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if ( mmresult != MMSYSERR_NOERROR )
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{
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return E_FAIL;
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}
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return S_OK;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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void CTonePlayer::CloseWaveDevice(void)
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{
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if ( m_fInitialized == FALSE )
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{
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ASSERT( FALSE );
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}
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ASSERT( m_hWaveOut != NULL );
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if ( m_hWaveOut != NULL )
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{
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waveOutClose( m_hWaveOut );
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m_hWaveOut = NULL;
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}
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}
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