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 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 int _sequence = 3; // compressed audio packets start after the headers with sequence number 3
private ProcessingState(
VorbisInfo vorbisInfo,
LookupCollection lookups,
float[][] pcm,
int[] window,
int centerWindow)
{
_vorbisInfo = vorbisInfo;
_lookups = lookups;
_pcm = pcm;
_window = window;
_centerWindow = centerWindow;
}
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);
}
public static ProcessingState Create(VorbisInfo info)
{
if (info == null)
{
throw new ArgumentNullException(nameof(info));
}
var codecSetup = info.CodecSetup;
// initialize the storage vectors. blocksize[1] is small for encode, but the correct size for decode
var pcmStorage = codecSetup.BlockSizes[1];
var pcm = new float[info.Channels][];
for (var i = 0; i < pcm.Length; i++)
{
pcm[i] = new float[pcmStorage];
}
// Vorbis I uses only window type 0
var window = new int[2];
window[0] = Encoding.Log(codecSetup.BlockSizes[0]) - 7;
window[1] = Encoding.Log(codecSetup.BlockSizes[1]) - 7;
var centerWindow = codecSetup.BlockSizes[1] / 2;
var lookups = LookupCollection.Create(info);
return(new ProcessingState(
info,
lookups,
pcm,
window,
centerWindow));
}
public static LookupCollection Create(VorbisInfo info)
{
var codecSetup = info.CodecSetup;
var psyGlobal = new PsyGlobalLookup(codecSetup.PsyGlobalParam);
var envelope = new EnvelopeLookup(codecSetup.PsyGlobalParam, info);
// MDCT is tranform 0
var transform = new MdctLookup[2];
transform[0] = new MdctLookup(codecSetup.BlockSizes[0]);
transform[1] = new MdctLookup(codecSetup.BlockSizes[1]);
// analysis always needs an fft
var fftLookup = new DrftLookup[2];
fftLookup[0] = new DrftLookup(codecSetup.BlockSizes[0]);
fftLookup[1] = new DrftLookup(codecSetup.BlockSizes[1]);
// finish the codebooks
if (codecSetup.FullBooks == null)
{
codecSetup.FullBooks = new CodeBook[codecSetup.BookParams.Count];
for (var i = 0; i < codecSetup.BookParams.Count; i++)
{
codecSetup.FullBooks[i] = CodeBook.InitEncode(codecSetup.BookParams[i]);
}
}
var psyLookup = new PsyLookup[codecSetup.PsyParams.Count];
for (var i = 0; i < psyLookup.Length; i++)
{
psyLookup[i] = new PsyLookup(
codecSetup.PsyParams[i],
codecSetup.PsyGlobalParam,
codecSetup.BlockSizes[codecSetup.PsyParams[i].BlockFlag] / 2,
info.SampleRate);
}
// initialize all the backend lookups
var floor = new FloorLookup[codecSetup.FloorParams.Count];
for (var i = 0; i < floor.Length; i++)
{
floor[i] = new FloorLookup(codecSetup.FloorParams[i]);
}
var residue = new ResidueLookup[codecSetup.ResidueParams.Count];
for (var i = 0; i < residue.Length; i++)
{
residue[i] = new ResidueLookup(codecSetup.ResidueParams[i], new List <CodeBook>(codecSetup.FullBooks));
}
return(new LookupCollection(
envelope,
new List <MdctLookup>(transform),
psyGlobal,
new List <PsyLookup>(psyLookup),
new List <DrftLookup>(fftLookup),
new List <FloorLookup>(floor),
new List <ResidueLookup>(residue)));
}
