public override void BuildTree(BitStream m)
{
//Read tag
int tag = m.ReadBits(1);
//If tag is zero, finish
if (tag == 0)
{
return;
}
lowByteTree = new Huffmantree();
lowByteTree.BuildTree(m);
highByteTree = new Huffmantree();
highByteTree.BuildTree(m);
iMarker1 = m.ReadBits(16);
//System.Console.WriteLine("M1:" + iMarker1);
iMarker2 = m.ReadBits(16);
//System.Console.WriteLine("M2:" + iMarker2);
iMarker3 = m.ReadBits(16);
//System.Console.WriteLine("M3:" + iMarker3);
RootNode = new Node();
BuildTree(m, RootNode);
//For some reason we have to skip a bit
m.ReadBits(1);
if (marker1 == null)
{
// System.Console.WriteLine("Not using marker 1");
marker1 = new Node();
}
if (marker2 == null)
{
// System.Console.WriteLine("Not using marker 2");
marker2 = new Node();
}
if (marker3 == null)
{
// System.Console.WriteLine("Not using marker 3");
marker3 = new Node();
}
}
/// <summary>
/// Reads the next frame.
/// </summary>
public void ReadNextFrame()
{
uint mask = 1;
if (CurrentFrame >= File.Header.NbFrames)
throw new EndOfStreamException("No more frames");
long currentPos = File.Stream.Position;
//If this frame has a palette record
if ((File.FrameTypes[CurrentFrame] & mask) > 0)
{
//Update the palette
UpdatePalette();
}
//Sound data
mask <<= 1;
for (int i = 0; i < 7; i++, mask <<= 1)
{
if ((file.FrameTypes[CurrentFrame] & mask) > 0)
{
long pos = File.Stream.Position;
uint length = Util.ReadDWord(File.Stream);
//We assume compression, if not, well too bad
uint unpackedLength = Util.ReadDWord(File.Stream);
BitStream m = new BitStream(File.Stream);
if (m.ReadBits(1) != 0) //Audio present
{
bool stereo = m.ReadBits(1) > 0;
bool is16Bit = m.ReadBits(1) > 0;
//Next are some trees
uint nbTrees = 1;
if (stereo)
nbTrees <<= 1;
if (is16Bit)
nbTrees <<= 1;
Huffmantree[] tree = new Huffmantree[nbTrees];
byte[] audioData = new byte[unpackedLength + 4];
uint audioDataIndex = 0;
for (int k = 0; k < nbTrees; k++)
{
tree[k] = new Huffmantree();
tree[k].BuildTree(m);
}
int res;
if (is16Bit)
{
Int16 rightBaseMSB = 0, rightBaseLSB = 0, leftBaseMSB = 0, leftBaseLSB = 0;
rightBaseMSB = (Int16)(m.ReadBits(8));
rightBaseLSB = (Int16)(m.ReadBits(8));
//Add sample (little endian)
audioData[audioDataIndex++] = (byte)rightBaseLSB; //Lower byte
audioData[audioDataIndex++] = (byte)rightBaseMSB; //Higher byte
if (stereo)
{
leftBaseMSB = (Int16)(m.ReadBits(8));
leftBaseLSB = (Int16)(m.ReadBits(8));
//Add sample (little endian)
audioData[audioDataIndex++] = (byte)leftBaseLSB; //Lower byte
audioData[audioDataIndex++] = (byte)leftBaseMSB; //Higher byte
}
for (int l = 0; l < unpackedLength / 2; l++)
{
if ((l & ((stereo) ? 1 : 0)) > 0)
{
res = tree[2].Decode(m);
leftBaseLSB += (Int16)res;
res = tree[3].Decode(m);
leftBaseMSB += (Int16)res;
leftBaseMSB += (Int16)(leftBaseLSB >> 8);
leftBaseLSB &= 0xFF;
//Add sample (little endian)
audioData[audioDataIndex++] = (byte)leftBaseLSB; //Lower byte
audioData[audioDataIndex++] = (byte)leftBaseMSB; //Higher byte
}
else
{
res = tree[0].Decode(m);
rightBaseLSB += (Int16)res;
res = tree[1].Decode(m);
rightBaseMSB += (Int16)res;
rightBaseMSB += (Int16)(rightBaseLSB >> 8);
rightBaseLSB &= 0xFF;
//Add sample (little endian)
audioData[audioDataIndex++] = (byte)rightBaseLSB; //Lower byte
audioData[audioDataIndex++] = (byte)rightBaseMSB; //Higher byte
}
}
}
else
{
byte rightBase = (byte)m.ReadBits(8), leftBase = 0;
//Add sample
audioData[audioDataIndex++] = rightBase;
if (stereo)
{
leftBase = (byte)m.ReadBits(8);
//Add sample
audioData[audioDataIndex++] = leftBase;
}
for (int l = 0; l < unpackedLength; l++)
{
if ((l & ((stereo) ? 1 : 0)) > 0)
{
leftBase += (byte)tree[1].Decode(m);
//Add sample
audioData[audioDataIndex++] = leftBase;
}
else
{
rightBase += (byte)tree[0].Decode(m);
//Add sample
audioData[audioDataIndex++] = rightBase;
}
}
}
lastAudioData[i] = audioData;
}
File.Stream.Seek(pos + (long)length, SeekOrigin.Begin);
}
}
//Video data
try
{
DecodeVideo();
}
catch (IOException exc)
{
Console.WriteLine("Exception caught while decoding frame:" + exc.ToString());
}
//Seek to the next frame
File.Stream.Seek(currentPos + File.FrameSizes[CurrentFrame], SeekOrigin.Begin);
CurrentFrame++;
}
public override void BuildTree(BitStream m)
{
//Read tag
int tag = m.ReadBits(1);
//If tag is zero, finish
if (tag == 0) return;
lowByteTree = new Huffmantree();
lowByteTree.BuildTree(m);
highByteTree = new Huffmantree();
highByteTree.BuildTree(m);
iMarker1 = m.ReadBits(16);
//System.Console.WriteLine("M1:" + iMarker1);
iMarker2 = m.ReadBits(16);
//System.Console.WriteLine("M2:" + iMarker2);
iMarker3 = m.ReadBits(16);
//System.Console.WriteLine("M3:" + iMarker3);
RootNode = new Node();
BuildTree(m, RootNode);
//For some reason we have to skip a bit
m.ReadBits(1);
if (marker1 == null)
{
// System.Console.WriteLine("Not using marker 1");
marker1 = new Node();
}
if (marker2 == null)
{
// System.Console.WriteLine("Not using marker 2");
marker2 = new Node();
}
if (marker3 == null)
{
// System.Console.WriteLine("Not using marker 3");
marker3 = new Node();
}
}
/// <summary>
/// Reads the next frame.
/// </summary>
public void ReadNextFrame()
{
uint mask = 1;
if (CurrentFrame >= File.Header.NbFrames)
{
throw new EndOfStreamException("No more frames");
}
long currentPos = File.Stream.Position;
//If this frame has a palette record
if ((File.FrameTypes[CurrentFrame] & mask) > 0)
{
//Update the palette
UpdatePalette();
}
//Sound data
mask <<= 1;
for (int i = 0; i < 7; i++, mask <<= 1)
{
if ((file.FrameTypes[CurrentFrame] & mask) > 0)
{
long pos = File.Stream.Position;
uint length = Util.ReadDWord(File.Stream);
//We assume compression, if not, well too bad
uint unpackedLength = Util.ReadDWord(File.Stream);
BitStream m = new BitStream(File.Stream);
if (m.ReadBits(1) != 0) //Audio present
{
bool stereo = m.ReadBits(1) > 0;
bool is16Bit = m.ReadBits(1) > 0;
//Next are some trees
uint nbTrees = 1;
if (stereo)
{
nbTrees <<= 1;
}
if (is16Bit)
{
nbTrees <<= 1;
}
Huffmantree[] tree = new Huffmantree[nbTrees];
byte[] audioData = new byte[unpackedLength + 4];
uint audioDataIndex = 0;
for (int k = 0; k < nbTrees; k++)
{
tree[k] = new Huffmantree();
tree[k].BuildTree(m);
}
int res;
if (is16Bit)
{
Int16 rightBaseMSB = 0, rightBaseLSB = 0, leftBaseMSB = 0, leftBaseLSB = 0;
rightBaseMSB = (Int16)(m.ReadBits(8));
rightBaseLSB = (Int16)(m.ReadBits(8));
//Add sample (little endian)
audioData[audioDataIndex++] = (byte)rightBaseLSB; //Lower byte
audioData[audioDataIndex++] = (byte)rightBaseMSB; //Higher byte
if (stereo)
{
leftBaseMSB = (Int16)(m.ReadBits(8));
leftBaseLSB = (Int16)(m.ReadBits(8));
//Add sample (little endian)
audioData[audioDataIndex++] = (byte)leftBaseLSB; //Lower byte
audioData[audioDataIndex++] = (byte)leftBaseMSB; //Higher byte
}
for (int l = 0; l < unpackedLength / 2; l++)
{
if ((l & ((stereo) ? 1 : 0)) > 0)
{
res = tree[2].Decode(m);
leftBaseLSB += (Int16)res;
res = tree[3].Decode(m);
leftBaseMSB += (Int16)res;
leftBaseMSB += (Int16)(leftBaseLSB >> 8);
leftBaseLSB &= 0xFF;
//Add sample (little endian)
audioData[audioDataIndex++] = (byte)leftBaseLSB; //Lower byte
audioData[audioDataIndex++] = (byte)leftBaseMSB; //Higher byte
}
else
{
res = tree[0].Decode(m);
rightBaseLSB += (Int16)res;
res = tree[1].Decode(m);
rightBaseMSB += (Int16)res;
rightBaseMSB += (Int16)(rightBaseLSB >> 8);
rightBaseLSB &= 0xFF;
//Add sample (little endian)
audioData[audioDataIndex++] = (byte)rightBaseLSB; //Lower byte
audioData[audioDataIndex++] = (byte)rightBaseMSB; //Higher byte
}
}
}
else
{
byte rightBase = (byte)m.ReadBits(8), leftBase = 0;
//Add sample
audioData[audioDataIndex++] = rightBase;
if (stereo)
{
leftBase = (byte)m.ReadBits(8);
//Add sample
audioData[audioDataIndex++] = leftBase;
}
for (int l = 0; l < unpackedLength; l++)
{
if ((l & ((stereo) ? 1 : 0)) > 0)
{
leftBase += (byte)tree[1].Decode(m);
//Add sample
audioData[audioDataIndex++] = leftBase;
}
else
{
rightBase += (byte)tree[0].Decode(m);
//Add sample
audioData[audioDataIndex++] = rightBase;
}
}
}
lastAudioData[i] = audioData;
}
File.Stream.Seek(pos + (long)length, SeekOrigin.Begin);
}
}
//Video data
try
{
DecodeVideo();
}
catch (IOException exc)
{
Console.WriteLine("Exception caught while decoding frame:" + exc.ToString());
}
//Seek to the next frame
File.Stream.Seek(currentPos + File.FrameSizes[CurrentFrame], SeekOrigin.Begin);
CurrentFrame++;
}