70 行
1.8 KiB
C++
70 行
1.8 KiB
C++
//#include "stdafx.h"
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#include "TZXBlockTurboSpeedData.h"
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#include "TZXFile.h"
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#include <stdlib.h>
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#include <stdio.h>
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TZXBlockTurboSpeedData::TZXBlockTurboSpeedData()
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{
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m_nBlockID = TZX_BLOCKID_TURBO_SPEED_DATA;
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m_pData = NULL;
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}
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TZXBlockTurboSpeedData::~TZXBlockTurboSpeedData()
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{
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if (m_pData) free(m_pData);
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}
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char *TZXBlockTurboSpeedData::GetDescription()
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{
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snprintf((char *)m_szToStringDescription, MAX_STRING_LENGTH, "Turbo Speed Data Block: %d bytes. Delay = %d ms", m_nDataLength, m_nDelayAfterBlock);
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return m_szToStringDescription;
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}
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void TZXBlockTurboSpeedData::GenerateAudio(TZXAudioGenerator *pAudioGenerator, TZXFile *pTZXFile)
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{
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//printf("Block starts at time %0.3f\n", (float)(pAudioGenerator->GetCurrentLength()) / 44100.0f);
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// Store the offset location for the current block
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m_nAudioBufferOffsetLocation = pAudioGenerator->GetCurrentLength();
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pAudioGenerator->SetAmp(false); // Make sure the pilot always starts on a false.
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for (int i = 0; i <= m_nPilotCount; i++)
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{
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pAudioGenerator->GeneratePulse(m_nPilotPulse);
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}
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// Generate the two sync pulses
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pAudioGenerator->GeneratePulse(m_nFirstSyncPulse);
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pAudioGenerator->GeneratePulse(m_nSecondSyncPulse);
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// Generate the actual data
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for (int i = 0; i < m_nDataLength; i++)
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{
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int bits = 8;
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if (i == (m_nDataLength - 1)) bits = m_nBitsInLastByte;
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for (int n = 0; n<bits; n++)
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{
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char mask = 1 << (7-n);
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char bitset = m_pData[i] & mask;
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if (bitset)
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{
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// Write a one bit
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pAudioGenerator->GeneratePulse(m_nOneBitPulse);
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pAudioGenerator->GeneratePulse(m_nOneBitPulse);
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}
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else {
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// Write a zero bit
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pAudioGenerator->GeneratePulse(m_nZeroBitPulse);
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pAudioGenerator->GeneratePulse(m_nZeroBitPulse);
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}
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}
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}
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// Add any delay at the end of the block
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if (m_nDelayAfterBlock) pAudioGenerator->AddSilence(m_nDelayAfterBlock);
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}
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