1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
//#include "stdafx.h"
#include "TZXBlockPureData.h"
#include "TZXFile.h"
#include <stdlib.h>
TZXBlockPureData::TZXBlockPureData()
{
m_nBlockID = TZX_BLOCKID_PURE_DATA;
m_pData = NULL;
}
TZXBlockPureData::~TZXBlockPureData()
{
if (m_pData) free(m_pData);
}
void TZXBlockPureData::GenerateAudio(TZXAudioGenerator *pAudioGenerator, TZXFile *pTZXFile)
{
m_nAudioBufferOffsetLocation = pAudioGenerator->GetCurrentLength();
// Generate the actual data
for (int i = 0; i < m_nDataLength; i++)
{
int bits = 8;
if (i == (m_nDataLength - 1)) bits = m_nBitsInLastByte;
for (int n = 0; n < bits; n++)
{
char mask = 1 << (7-n);
char bitset = m_pData[i] & mask;
if (bitset)
{
// Write a one bit
pAudioGenerator->GeneratePulse(m_nLengthOfOnePulse);
pAudioGenerator->GeneratePulse(m_nLengthOfOnePulse);
}
else {
// Write a zero bit
pAudioGenerator->GeneratePulse(m_nLengthOfZeroPulse);
pAudioGenerator->GeneratePulse(m_nLengthOfZeroPulse);
}
}
}
// Add any delay at the end of the block
if (m_nPauseAfterBlock) pAudioGenerator->AddSilence(m_nPauseAfterBlock);
}
char *TZXBlockPureData::GetDescription()
{
snprintf((char *)m_szToStringDescription, MAX_STRING_LENGTH, "Pure Data Block: %d bytes. Delay = %d ms", m_nDataLength, m_nPauseAfterBlock);
return m_szToStringDescription;
}
|
