private static void PackModes(EncodeBuffer buffer, CodecSetup codecSetup, int i)
{
buffer.Write((uint)codecSetup.ModeParams[i].BlockFlag, 1);
buffer.Write((uint)codecSetup.ModeParams[i].WindowType, 16);
buffer.Write((uint)codecSetup.ModeParams[i].TransformType, 16);
buffer.Write((uint)codecSetup.ModeParams[i].Mapping, 8);
}
private static void PackComment(EncodeBuffer buffer, Comments vorbisComment)
{
// Preamble
buffer.Write(0x03, 8);
buffer.WriteString(VorbisString);
// Vendor
buffer.Write((uint)VendorString.Length, 32);
buffer.WriteString(VendorString);
// Comments
buffer.Write((uint)vorbisComment.UserComments.Count, 32);
foreach (var comment in vorbisComment.UserComments)
{
if (!string.IsNullOrEmpty(comment))
{
buffer.Write((uint)comment.Length, 32);
buffer.WriteString(comment);
}
else
{
buffer.Write(0, 32);
}
}
buffer.Write(1, 1);
}
public OggPacket BuildBooksPacket(VorbisInfo info)
{
var buffer = new EncodeBuffer(4096);
PackBooks(buffer, info);
var bytes = buffer.GetBytes();
return(new OggPacket(bytes, false, 0, 2));
}
public OggPacket BuildCommentsPacket(Comments comments)
{
var buffer = new EncodeBuffer();
PackComment(buffer, comments);
var bytes = buffer.GetBytes();
return(new OggPacket(bytes, false, 0, 1));
}
public OggPacket BuildInfoPacket(VorbisInfo info)
{
var buffer = new EncodeBuffer();
PackInfo(buffer, info);
var bytes = buffer.GetBytes();
return(new OggPacket(bytes, false, 0, 0));
}
private static void PackMapping(EncodeBuffer buffer, VorbisInfo info, Mapping mapping)
{
/* another 'we meant to do it this way' hack... up to beta 4, we
* packed 4 binary zeros here to signify one submapping in use. We
* now redefine that to mean four bitflags that indicate use of
* deeper features; bit0:submappings, bit1:coupling,
* bit2,3:reserved. This is backward compatible with all actual uses
* of the beta code. */
if (mapping.SubMaps > 1)
{
buffer.Write(1, 1);
buffer.Write((uint)mapping.SubMaps - 1, 4);
}
else
{
buffer.Write(0, 1);
}
if (mapping.CouplingSteps > 0)
{
buffer.Write(1, 1);
buffer.Write((uint)mapping.CouplingSteps - 1, 8);
var couplingBits = Encoding.Log(info.Channels - 1);
for (var i = 0; i < mapping.CouplingSteps; i++)
{
buffer.Write((uint)mapping.CouplingMag[i], couplingBits);
buffer.Write((uint)mapping.CouplingAng[i], couplingBits);
}
}
else
{
buffer.Write(0, 1);
}
buffer.Write(0, 2); // 2,3:reserved
// we don't write the channel submappings if we only have one...
if (mapping.SubMaps > 1)
{
for (var i = 0; i < info.Channels; i++)
{
buffer.Write((uint)mapping.ChannelMuxList[i], 4);
}
}
for (var i = 0; i < mapping.SubMaps; i++)
{
buffer.Write(0, 8); // time submap unused
buffer.Write((uint)mapping.FloorSubMap[i], 8);
buffer.Write((uint)mapping.ResidueSubMap[i], 8);
}
}
private static void PackFloor(EncodeBuffer buffer, Floor floor)
{
var count = 0;
var maxposit = floor.PostList[1];
var maxclass = -1;
// save out partitions
buffer.Write((uint)floor.PartitionClass.Length, 5); // only 0 to 31 legal
foreach (var partitionClass in floor.PartitionClass)
{
buffer.Write((uint)partitionClass, 4); // only 0 to 15 legal
if (maxclass < partitionClass)
{
maxclass = partitionClass;
}
}
// save out partition classes
for (var j = 0; j < maxclass + 1; j++)
{
buffer.Write((uint)(floor.ClassDimensions[j] - 1), 3); // 1 to 8
buffer.Write((uint)floor.ClassSubs[j], 2); // 0 to 3
if (floor.ClassSubs[j] != 0)
{
buffer.Write((uint)floor.ClassBook[j], 8);
}
for (var k = 0; k < 1 << floor.ClassSubs[j]; k++)
{
buffer.Write((uint)(floor.ClassSubBook[j][k] + 1), 8);
}
}
// save out the post list, only 1,2,3,4 legal now
buffer.Write((uint)(floor.Mult - 1), 2);
// maxposit cannot legally be less than 1; this is encode-side, we can assume our setup is OK
buffer.Write((uint)Encoding.Log(maxposit - 1), 4);
var rangebits = Encoding.Log(maxposit - 1);
for (int j = 0, k = 0; j < floor.PartitionClass.Length; j++)
{
count += floor.ClassDimensions[floor.PartitionClass[j]];
for (; k < count; k++)
{
buffer.Write((uint)floor.PostList[k + 2], rangebits);
}
}
}
private void PackBooks(EncodeBuffer buffer, VorbisInfo info)
{
var codecSetup = info.CodecSetup;
buffer.Write(0x05, 8);
buffer.WriteString(VorbisString);
buffer.Write((uint)(codecSetup.BookParams.Count - 1), 8);
foreach (var book in codecSetup.BookParams)
{
PackStaticBook(buffer, book);
}
// times; hook placeholders
buffer.Write(0, 6);
buffer.Write(0, 16);
buffer.Write((uint)(codecSetup.FloorParams.Count - 1), 6);
foreach (var floor in codecSetup.FloorParams)
{
buffer.Write(1, 16); // For now we're only using floor type 1
PackFloor(buffer, floor);
}
buffer.Write((uint)(codecSetup.ResidueParams.Count - 1), 6);
foreach (var residue in codecSetup.ResidueParams)
{
buffer.Write((uint)residue.ResidueType, 16);
PackResidue(buffer, residue);
}
buffer.Write((uint)(codecSetup.MapParams.Count - 1), 6);
foreach (var mapping in codecSetup.MapParams)
{
buffer.Write(0, 16); // Mapping type is always zero
PackMapping(buffer, info, mapping);
}
buffer.Write((uint)(codecSetup.ModeParams.Count - 1), 6);
for (var i = 0; i < codecSetup.ModeParams.Count; i++)
{
PackModes(buffer, codecSetup, i);
}
buffer.Write(1, 1);
}
private static void PackInfo(EncodeBuffer buffer, VorbisInfo info)
{
var codecSetup = info.CodecSetup;
// preamble
buffer.Write(0x01, 8);
buffer.WriteString(VorbisString);
// basic information about the stream
buffer.Write(0x00, 32);
buffer.Write((uint)info.Channels, 8);
buffer.Write((uint)info.SampleRate, 32);
buffer.Write(0, 32); // Bit rate upper not used
buffer.Write((uint)info.BitRateNominal, 32);
buffer.Write(0, 32); // Bit rate lower not used
buffer.Write((uint)Encoding.Log(codecSetup.BlockSizes[0] - 1), 4);
buffer.Write((uint)Encoding.Log(codecSetup.BlockSizes[1] - 1), 4);
buffer.Write(1, 1);
}
private byte[] PerformAnalysis(
float[][] pcm,
int pcmEnd)
{
var channels = pcm.Length;
var gmdct = new float[channels][];
var work = new int[channels][];
var floorPosts = new int[channels][][];
var localAmpMax = new float[channels];
var blockType = 0;
if (_currentWindow != 0)
{
if ((_lastWindow != 0) && (_nextWindow != 0))
{
blockType = 1;
}
}
else
{
if (!MarkEnvelope())
{
blockType = 1;
}
}
var mapping = _vorbisInfo.CodecSetup.MapParams[_currentWindow];
var psyLookup = _lookups.PsyLookup[blockType + (_currentWindow != 0 ? 2 : 0)];
var buffer = new EncodeBuffer();
TransformPcm(pcm, pcmEnd, work, gmdct, localAmpMax);
ApplyMasks(pcm, pcmEnd, mapping, floorPosts, gmdct, psyLookup, localAmpMax);
Encode(pcm, pcmEnd, buffer, mapping, work, floorPosts, psyLookup, gmdct);
return(buffer.GetBytes());
}
private static void PackResidue(EncodeBuffer buffer, Residue residue)
{
buffer.Write((uint)residue.Begin, 24);
buffer.Write((uint)residue.End, 24);
buffer.Write((uint)(residue.Grouping - 1), 24);
// residue vectors to group and code with a partitioned book
buffer.Write((uint)(residue.Partitions - 1), 6); // possible partition choices
buffer.Write((uint)residue.GroupBook, 8); // group huffman book
var acc = 0;
// secondstages is a bitmask; as encoding progresses pass by pass, a
// bitmask of one indicates this partition class has bits to write this pass
for (var j = 0; j < residue.Partitions; j++)
{
if (Encoding.Log(residue.SecondStages[j]) > 3)
{
// yes, this is a minor hack due to not thinking ahead
buffer.Write((uint)residue.SecondStages[j], 3);
buffer.Write(1, 1);
buffer.Write((uint)residue.SecondStages[j] >> 3, 5);
}
else
{
buffer.Write((uint)residue.SecondStages[j], 4); // trailing zero
}
acc += Count(residue.SecondStages[j]);
}
for (var j = 0; j < acc; j++)
{
buffer.Write((uint)residue.BookList[j], 8);
}
}
private void Encode(
float[][] pcm,
int pcmEnd,
EncodeBuffer buffer,
Mapping mapping,
int[][] work,
int[][][] floorPosts,
PsyLookup psyLookup,
float[][] gmdct)
{
var codecSetup = _vorbisInfo.CodecSetup;
var channels = pcm.Length;
var nonzero = new bool[channels];
//the next phases are performed once for vbr-only and PACKETBLOB
//times for bitrate managed modes.
//1) encode actual mode being used
//2) encode the floor for each channel, compute coded mask curve/res
//3) normalize and couple.
//4) encode residue
//5) save packet bytes to the packetblob vector
// iterate over the many masking curve fits we've created
var coupleBundle = new int[channels][];
var zerobundle = new bool[channels];
const int k = PsyGlobal.PacketBlobs / 2;
// start out our new packet blob with packet type and mode
// Encode the packet type
buffer.Write(0, 1);
// Encode the modenumber
// Encode frame mode, pre,post windowsize, then dispatch
var modeBits = Encoding.Log(codecSetup.ModeParams.Count - 1);
buffer.Write((uint)_currentWindow, modeBits);
if (_currentWindow != 0)
{
buffer.Write((uint)_lastWindow, 1);
buffer.Write((uint)_nextWindow, 1);
}
// encode floor, compute masking curve, sep out residue
for (var i = 0; i < channels; i++)
{
var submap = mapping.ChannelMuxList[i];
nonzero[i] = _lookups.FloorLookup[mapping.FloorSubMap[submap]].Encode(
buffer,
codecSetup.BookParams,
codecSetup.FullBooks,
floorPosts[i][k],
work[i],
pcmEnd,
codecSetup.BlockSizes[_currentWindow] / 2);
}
// our iteration is now based on masking curve, not prequant and
// coupling. Only one prequant/coupling step quantize/couple
// incomplete implementation that assumes the tree is all depth
// one, or no tree at all
psyLookup.CoupleQuantizeNormalize(
k,
codecSetup.PsyGlobalParam,
mapping,
gmdct,
work,
nonzero,
codecSetup.PsyGlobalParam.SlidingLowPass[_currentWindow][k],
channels);
// classify and encode by submap
for (var i = 0; i < mapping.SubMaps; i++)
{
var channelsInBundle = 0;
var resNumber = mapping.ResidueSubMap[i];
for (var j = 0; j < channels; j++)
{
if (mapping.ChannelMuxList[j] == i)
{
zerobundle[channelsInBundle] = nonzero[j];
coupleBundle[channelsInBundle++] = work[j];
}
}
var residue = _lookups.ResidueLookup[resNumber];
var classifications = residue.Class(
coupleBundle,
zerobundle,
channelsInBundle);
channelsInBundle = 0;
for (var j = 0; j < channels; j++)
{
if (mapping.ChannelMuxList[j] == i)
{
coupleBundle[channelsInBundle++] = work[j];
}
}
residue.Forward(
buffer,
pcmEnd,
coupleBundle,
zerobundle,
channelsInBundle,
classifications);
}
}
private void PackStaticBook(EncodeBuffer buffer, IStaticCodeBook book)
{
var ordered = false;
// first the basic parameters
buffer.Write(0x564342, 24);
buffer.Write((uint)book.Dimensions, 16);
buffer.Write((uint)book.LengthList.Length, 24);
// pack the codewords. There are two packing types; length ordered and length random.
int i;
for (i = 1; i < book.LengthList.Length; i++)
{
if ((book.LengthList[i - 1] == 0) || (book.LengthList[i] < book.LengthList[i - 1]))
{
break;
}
}
if (i == book.LengthList.Length)
{
ordered = true;
}
if (ordered)
{
// length ordered. We only need to say how many codewords of each length. The actual codewords are generated deterministically
buffer.Write(1, 1);
buffer.Write((uint)(book.LengthList[0] - 1), 5); // 1 to 32
var count = 0;
for (i = 1; i < book.LengthList.Length; i++)
{
var current = book.LengthList[i];
var previous = book.LengthList[i - 1];
if (current <= previous)
{
continue;
}
for (var j = previous; j < current; j++)
{
buffer.Write((uint)(i - count), Encoding.Log(book.LengthList.Length - count));
count = i;
}
}
buffer.Write((uint)(i - count), Encoding.Log(book.LengthList.Length - count));
}
else
{
// length unordered. Again, we don't code the codeword itself, just the length. This time, though, we have to encode each length
buffer.Write(0, 1);
/* algorithmic mapping has use for 'unused entries', which we tag
* here. The algorithmic mapping happens as usual, but the unused
* entry has no codeword. */
for (i = 0; i < book.LengthList.Length; i++)
{
if (book.LengthList[i] == 0)
{
break;
}
}
if (i == book.LengthList.Length)
{
buffer.Write(0, 1); // no unused entries
for (i = 0; i < book.LengthList.Length; i++)
{
buffer.Write((uint)(book.LengthList[i] - 1), 5);
}
}
else
{
buffer.Write(1, 1); // we have unused entries; thus we tag
for (i = 0; i < book.LengthList.Length; i++)
{
if (book.LengthList[i] == 0)
{
buffer.Write(0, 1);
}
else
{
buffer.Write(1, 1);
buffer.Write((uint)(book.LengthList[i] - 1), 5);
}
}
}
}
buffer.Write((uint)book.MapType, 4);
if (book.MapType == CodeBookMapType.None)
{
return;
}
// is the entry number the desired return value, or do we have a mapping? If we have a mapping, what type?
if ((book.MapType != CodeBookMapType.Implicit) && (book.MapType != CodeBookMapType.Listed))
{
throw new InvalidOperationException("Unknown CodeBookMapType: {book.MapType}");
}
if (book.QuantList == null)
{
throw new InvalidOperationException("QuantList cannot be null");
}
// values that define the dequantization
buffer.Write((uint)book.QuantMin, 32);
buffer.Write((uint)book.QuantDelta, 32);
buffer.Write((uint)(book.Quant - 1), 4);
buffer.Write((uint)book.QuantSequenceP, 1);
var quantVals = 0;
switch (book.MapType)
{
case CodeBookMapType.Implicit:
// a single column of (c.entries/c.dim) quantized values for building a full value list algorithmically (square lattice)
quantVals = book.GetQuantVals();
break;
case CodeBookMapType.Listed:
// every value (c.entries*c.dim total) specified explicitly
quantVals = book.LengthList.Length * book.Dimensions;
break;
}
// quantized values
for (i = 0; i < quantVals; i++)
{
buffer.Write((uint)Math.Abs(book.QuantList[i]), book.Quant);
}
}