/// <summary>
/// takes posession of the supplied stream
/// </summary>
public void LoadStream(Stream s)
{
Dispose();
BaseStream = s;
readCounter = 0;
BinaryReader br = new BinaryReader(s);
RiffChunk chunk = ReadChunk(br);
if (chunk.tag != "RIFF") throw new FormatException("can't recognize riff chunk");
riff = (RiffContainer)chunk;
}
public IRiffContainer Encode(ISound sound, int samplesPerBlock)
{
var sampleRate = sound[NumericData.Rate];
if (sampleRate == null)
{
var sampleRates = sound
.Samples
.Select(s => s[NumericData.Rate])
.Where(r => r != null)
.Distinct()
.ToArray();
sampleRate = sampleRates.SingleOrDefault();
}
if (sampleRate == null)
{
sampleRate = 44100;
}
var channels = sound.Samples.Count;
var byteRate = sampleRate * channels * 2 / 4; //not accurate but not far off
var container = new RiffContainer
{
Format = "WAVE",
Chunks = new List <IRiffChunk>()
};
var extraFormat = new MicrosoftAdpcmFormat
{
Coefficients = MicrosoftAdpcmConstants.DefaultCoefficients,
SamplesPerBlock = 500
};
var format = new RiffFormat
{
Format = 2,
SampleRate = (int)sampleRate,
Channels = channels,
ByteRate = (int)byteRate,
BitsPerSample = 4,
BlockAlign = _microsoftAdpcmEncoder.GetBlockSize(samplesPerBlock, channels),
ExtraData = extraFormat.ToBytes()
};
container.Chunks.Add(_formatEncoder.Encode(format));
container.Chunks.Add(new RiffChunk
{
Id = "data",
Data = _microsoftAdpcmEncoder.Encode(sound, samplesPerBlock)
});
return(container);
}
public void LoadStream(Stream s)
{
readCounter = 0;
BinaryReader br = new BinaryReader(s);
RiffChunk chunk = ReadChunk(br);
if (chunk.tag != "RIFF")
{
throw new FormatException("can't recognize riff chunk");
}
riff = (RiffContainer)chunk;
}
public RiffContainer_INFO(RiffContainer rc)
{
subchunks = rc.subchunks;
type = "INFO";
foreach (RiffChunk chunk in subchunks)
{
RiffSubchunk rsc = chunk as RiffSubchunk;
if (chunk == null)
{
throw new FormatException("Invalid subchunk of INFO list");
}
dictionary[rsc.tag] = System.Text.Encoding.ASCII.GetString(rsc.ReadAll());
}
}
/// <exception cref="FormatException"><paramref name="rc"/>.<see cref="RiffContainer.subchunks"/> contains a chunk that does not inherit <see cref="RiffSubchunk"/></exception>
public RiffContainer_INFO(RiffContainer rc)
{
subchunks = rc.subchunks;
type = "INFO";
foreach (RiffChunk chunk in subchunks)
{
RiffSubchunk rsc = chunk as RiffSubchunk;
if (chunk == null)
{
throw new FormatException("Invalid subchunk of INFO list"); //TODO is this supposed to be a check on `rsc` (i.e. as a type check)? --yoshi
}
dictionary[rsc.tag] = System.Text.Encoding.ASCII.GetString(rsc.ReadAll());
}
}
private RiffChunk ReadChunk(BinaryReader br)
{
RiffChunk ret;
string tag = ReadTag(br); readCounter += 4;
uint size = br.ReadUInt32(); readCounter += 4;
if (size > int.MaxValue)
{
throw new FormatException("chunk too big");
}
if (tag == "RIFF" || tag == "LIST")
{
RiffContainer rc = new RiffContainer
{
tag = tag,
type = ReadTag(br)
};
readCounter += 4;
long readEnd = readCounter - 4 + size;
while (readEnd > readCounter)
{
rc.subchunks.Add(ReadChunk(br));
}
ret = rc.Morph();
}
else
{
RiffSubchunk rsc = new RiffSubchunk
{
tag = tag,
Source = br.BaseStream,
Position = br.BaseStream.Position,
Length = size
};
readCounter += size;
br.BaseStream.Position += size;
ret = rsc.Morph();
}
if (size % 2 != 0)
{
br.ReadByte();
readCounter += 1;
}
return(ret);
}
public RiffChunk GetSubchunk(string tag, string type)
{
foreach (RiffChunk rc in subchunks)
{
if (rc.tag == tag)
{
if (type == null)
{
return(rc);
}
RiffContainer cont = rc as RiffContainer;
if (cont != null && cont.type == type)
{
return(rc);
}
}
}
return(null);
}
private RiffChunk ReadChunk(BinaryReader br)
{
RiffChunk ret;
string tag = ReadTag(br); readCounter += 4;
uint size = br.ReadUInt32(); readCounter += 4;
if (size > int.MaxValue)
{
throw new FormatException("chunk too big");
}
if (tag == "RIFF" || tag == "LIST")
{
RiffContainer rc = new RiffContainer();
rc.tag = tag;
rc.type = ReadTag(br); readCounter += 4;
long readEnd = readCounter - 4 + size;
while (readEnd > readCounter)
{
rc.subchunks.Add(ReadChunk(br));
}
ret = rc.Morph();
}
else
{
RiffSubchunk rsc = new RiffSubchunk();
rsc.tag = tag;
rsc.data = br.ReadBytes((int)size); readCounter += size;
ret = rsc.Morph();
}
if (size % 2 != 0)
{
br.ReadByte();
readCounter += 1;
}
return(ret);
}
public IRiffContainer Encode(ISound sound)
{
var sampleRate = sound[NumericData.Rate];
if (sampleRate == null)
{
var sampleRates = sound
.Samples
.Select(s => s[NumericData.Rate])
.Where(r => r != null)
.Distinct()
.ToArray();
sampleRate = sampleRates.SingleOrDefault();
}
if (sampleRate == null)
{
sampleRate = 44100;
}
var channels = sound.Samples.Count;
var byteRate = sampleRate * channels * 2;
var container = new RiffContainer
{
Format = "WAVE",
Chunks = new List <IRiffChunk>()
};
var format = new RiffFormat
{
Format = 1,
SampleRate = (int)sampleRate,
Channels = channels,
ByteRate = (int)byteRate,
BitsPerSample = 16,
BlockAlign = channels * 2,
ExtraData = new byte[0]
};
container.Chunks.Add(_formatEncoder.Encode(format));
var totalSamples = sound.Samples.Max(s => s.Data.Count);
using (var stream = new MemoryStream())
using (var writer = new BinaryWriter(stream))
{
for (var i = 0; i < totalSamples; i++)
{
for (var j = 0; j < sound.Samples.Count; j++)
{
var sample = sound.Samples[j];
var source = sample.Data;
var sourceValue = i < source.Count ? source[i] : 0f;
var value = Math.Round(sourceValue * 32767f);
if (value > 32767f)
{
value = 32767f;
}
else if (value < -32767f)
{
value = -32767f;
}
writer.Write((short)value);
}
}
container.Chunks.Add(new RiffChunk
{
Id = "data",
Data = stream.ToArray()
});
}
return(container);
}
private RiffChunk ReadChunk(BinaryReader br)
{
RiffChunk ret;
string tag = ReadTag(br); readCounter += 4;
uint size = br.ReadUInt32(); readCounter += 4;
if (size > int.MaxValue)
throw new FormatException("chunk too big");
if (tag == "RIFF" || tag == "LIST")
{
RiffContainer rc = new RiffContainer
{
tag = tag,
type = ReadTag(br)
};
readCounter += 4;
long readEnd = readCounter - 4 + size;
while (readEnd > readCounter)
rc.subchunks.Add(ReadChunk(br));
ret = rc.Morph();
}
else
{
RiffSubchunk rsc = new RiffSubchunk
{
tag = tag,
Source = br.BaseStream,
Position = br.BaseStream.Position,
Length = size
};
readCounter += size;
br.BaseStream.Position += size;
ret = rsc.Morph();
}
if (size % 2 != 0)
{
br.ReadByte();
readCounter += 1;
}
return ret;
}
public RiffContainer_INFO(RiffContainer rc)
{
subchunks = rc.subchunks;
type = "INFO";
foreach (RiffChunk chunk in subchunks)
{
RiffSubchunk rsc = chunk as RiffSubchunk;
if (chunk == null)
throw new FormatException("Invalid subchunk of INFO list");
dictionary[rsc.tag] = System.Text.Encoding.ASCII.GetString(rsc.ReadAll());
}
}
