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Extract out another helper method

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This commit is contained in:
Matt Nadareski
2021-07-07 10:40:44 -07:00
parent 902e2d73b3
commit 6f9c39f5c1
1 changed files with 36 additions and 26 deletions
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62
RedBookPlayer.Common/Hardware/SoundOutput.cs
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@@ -154,38 +154,14 @@ namespace RedBookPlayer.Common.Hardware
_soundOut.Volume = (float)Volume / 100;
// If we have an unreadable track, just return
if (_opticalDisc.BytesPerSector <= 0)
if(_opticalDisc.BytesPerSector <= 0)
{
Array.Clear(buffer, offset, count);
return count;
}
// Determine how many sectors we can read
ulong sectorsToRead;
ulong zeroSectorsAmount;
do
{
// Attempt to read 2 more sectors than requested
sectorsToRead = ((ulong)count / (ulong)_opticalDisc.BytesPerSector) + 2;
zeroSectorsAmount = 0;
// Avoid overreads by padding with 0-byte data at the end
if(_opticalDisc.CurrentSector + sectorsToRead > _opticalDisc.TotalSectors)
{
ulong oldSectorsToRead = sectorsToRead;
sectorsToRead = _opticalDisc.TotalSectors - _opticalDisc.CurrentSector;
int tempZeroSectorCount = (int)(oldSectorsToRead - sectorsToRead);
zeroSectorsAmount = (ulong)(tempZeroSectorCount < 0 ? 0 : tempZeroSectorCount);
}
// TODO: Figure out when this value could be negative
if(sectorsToRead <= 0)
{
_opticalDisc.LoadFirstTrack();
_currentSectorReadPosition = 0;
}
} while(sectorsToRead <= 0);
DetermineReadAmount(count, out ulong sectorsToRead, out ulong zeroSectorsAmount);
// Create padding data for overreads
byte[] zeroSectors = new byte[(int)zeroSectorsAmount * _opticalDisc.BytesPerSector];
@@ -303,6 +279,40 @@ namespace RedBookPlayer.Common.Hardware
/// <param name="volume">New volume value</param>
public void SetVolume(int volume) => Volume = volume;
/// <summary>
/// Determine the number of real and zero sectors to read
/// </summary>
/// <param name="count">Number of requested bytes to read</param>
/// <param name="sectorsToRead">Number of sectors to read</param>
/// <param name="zeroSectorsAmount">Number of zeroed sectors to concatenate</param>
private void DetermineReadAmount(int count, out ulong sectorsToRead, out ulong zeroSectorsAmount)
{
do
{
// Attempt to read 2 more sectors than requested
sectorsToRead = ((ulong)count / (ulong)_opticalDisc.BytesPerSector) + 2;
zeroSectorsAmount = 0;
// Avoid overreads by padding with 0-byte data at the end
if(_opticalDisc.CurrentSector + sectorsToRead > _opticalDisc.TotalSectors)
{
ulong oldSectorsToRead = sectorsToRead;
sectorsToRead = _opticalDisc.TotalSectors - _opticalDisc.CurrentSector;
int tempZeroSectorCount = (int)(oldSectorsToRead - sectorsToRead);
zeroSectorsAmount = (ulong)(tempZeroSectorCount < 0 ? 0 : tempZeroSectorCount);
}
// If we're reading past the last sector of the disc, wrap around
// TODO: Have past-end reads looping back controlled by a flag instead (Repeat? Repeat All?)
if(sectorsToRead <= 0)
{
_opticalDisc.LoadFirstTrack();
_currentSectorReadPosition = 0;
}
} while(sectorsToRead <= 0);
}
/// <summary>
/// Process de-emphasis of audio data
/// </summary>