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Minor performance opti regarding dvd ripping

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git-svn-id: https://subtitleedit.googlecode.com/svn/trunk@2108 99eadd0c-20b8-1223-b5c4-2a2b2df33de2
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niksedk 2013-09-22 13:18:40 +00:00
parent 0584c497db
commit 258e81ac86
1 changed files with 20 additions and 12 deletions
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32
src/Forms/DvdSubRip.cs
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@ -316,24 +316,32 @@ namespace Nikse.SubtitleEdit.Forms
/// <summary> /// <summary>
/// Write the 5 PTS bytes to buffer /// Write the 5 PTS bytes to buffer
/// </summary> /// </summary>
private void UpdatePresentationTimeStamp(byte[] buffer, long addPresentationTimeStamp, VobSubPack vsp) private static void UpdatePresentationTimeStamp(byte[] buffer, long addPresentationTimeStamp, VobSubPack vsp)
{ {
const int presentationTimeStampIndex = 23; const int presentationTimeStampIndex = 23;
string pre = "0011";
if (vsp.PacketizedElementaryStream.PresentationTimeStampDecodeTimeStampFlags == Helper.B00000010)
pre = "0010";
long newPts = addPresentationTimeStamp + ((long)vsp.PacketizedElementaryStream.PresentationTimeStamp.Value); long newPts = addPresentationTimeStamp + ((long)vsp.PacketizedElementaryStream.PresentationTimeStamp.Value);
string bString = Convert.ToString(newPts, 2).PadLeft(33, '0');
string fiveBytesString = pre + bString.Substring(0, 3) + "1" + bString.Substring(3, 15) + "1" + bString.Substring(18, 15) + "1"; var buffer5b = BitConverter.GetBytes((UInt64)newPts);
if (BitConverter.IsLittleEndian)
for (int i = 0; i < 5; i++)
{ {
byte b = Convert.ToByte(fiveBytesString.Substring((i * 8), 8), 2); buffer[presentationTimeStampIndex + 4] = (byte)(buffer5b[0] << 1 | Helper.B00000001); // last 7 bits + '1'
buffer[presentationTimeStampIndex + i] = b; buffer[presentationTimeStampIndex + 3] = (byte)((buffer5b[0] >> 7) + (buffer5b[1] << 1)); // the next 8 bits (1 from last byte, 7 from next)
buffer[presentationTimeStampIndex + 2] = (byte)((buffer5b[1] >> 6 | Helper.B00000001) + (buffer5b[2] << 2)); // the next 7 bits (1 from 2nd last byte, 6 from 3rd last byte)
buffer[presentationTimeStampIndex + 1] = (byte)((buffer5b[2] >> 6) + (buffer5b[3] << 2)); // the next 8 bits (2 from 3rd last byte, 6 from 2rd last byte)
buffer[presentationTimeStampIndex] = (byte)((buffer5b[3] >> 6 | Helper.B00000001) + (buffer5b[4] << 2));
} }
else
{
buffer[presentationTimeStampIndex + 4] = (byte)(buffer5b[7] << 1 | Helper.B00000001); // last 7 bits + '1'
buffer[presentationTimeStampIndex + 3] = (byte)((buffer5b[7] >> 7) + (buffer5b[6] << 1)); // the next 8 bits (1 from last byte, 7 from next)
buffer[presentationTimeStampIndex + 2] = (byte)((buffer5b[6] >> 6 | Helper.B00000001) + (buffer5b[5] << 2)); // the next 7 bits (1 from 2nd last byte, 6 from 3rd last byte)
buffer[presentationTimeStampIndex + 1] = (byte)((buffer5b[5] >> 6) + (buffer5b[4] << 2)); // the next 8 bits (2 from 3rd last byte, 6 from 2rd last byte)
buffer[presentationTimeStampIndex] = (byte)((buffer5b[4] >> 6 | Helper.B00000001) + (buffer5b[3] << 2));
}
if (vsp.PacketizedElementaryStream.PresentationTimeStampDecodeTimeStampFlags == Helper.B00000010)
buffer[presentationTimeStampIndex] += Helper.B00100000;
else
buffer[presentationTimeStampIndex] += Helper.B00110000;
} }
internal static bool IsPrivateStream2(byte[] buffer, int index) internal static bool IsPrivateStream2(byte[] buffer, int index)