/// <summary>
/// Initializes this upmixer by creating the obligatory reference channels and the extra channels that are
/// used by the <see cref="source"/>.
/// </summary>
void Init()
{
ReferenceChannel[] layout = ChannelPrototype.GetStandardMatrix(8);
output = new ChannelData[layout.Length];
for (int channel = 0; channel < layout.Length; ++channel)
{
output[channel].target = layout[channel];
}
output[0].lastSamples = new float[0]; // To skip null check in GenerateSamples
layout = ChannelPrototype.GetStandardMatrix(source.Channels);
List <ReferenceChannel> missing = new List <ReferenceChannel>();
for (int channel = 0; channel < layout.Length; ++channel)
{
if (!output.Has(entry => entry.target == layout[channel]))
{
missing.Add(layout[channel]);
}
}
int offset = output.Length, news = missing.Count;
Array.Resize(ref output, offset + news);
for (int channel = 0; channel < news; ++channel)
{
output[channel + offset] = new ChannelData(missing[channel]);
}
}
/// <summary>
/// Render new object samples for the next timeslot
/// </summary>
void RenderNextTimeslot()
{
float[] input = new float[QuadratureMirrorFilterBank.subbands * stream.ChannelCount];
stream.DecodeBlock(input, 0, input.LongLength);
Source?.ReadBlock(input, 0, input.LongLength);
WaveformUtils.InterlacedToMultichannel(input, inputData);
ReferenceChannel[] matrix = ChannelPrototype.GetStandardMatrix(stream.ChannelCount);
EnhancedAC3Decoder decoder = (EnhancedAC3Decoder)stream;
// Object-based rendering
if (HasObjects = decoder.Extensions.HasObjects)
{
decoder.Extensions.OAMD.UpdateSources(decoder.LastFetchStart / stream.ChannelCount, objects);
float[][] sources = new float[JointObjectCodingTables.inputMatrix.Length][];
for (int i = 0; i < sources.Length; ++i)
{
for (int j = 0; j < matrix.Length; ++j)
{
if (JointObjectCodingTables.inputMatrix[i] == matrix[j])
{
sources[i] = inputData[j];
break;
}
}
}
for (int i = 0; i < matrix.Length; ++i)
{
if (matrix[i] == ReferenceChannel.ScreenLFE)
{
lfeTimeslot = inputData[i];
}
}
timeslotResult = applier.Apply(sources, decoder.Extensions.JOC);
}
// Channel-based rendering or fallback to it when OAMD or JOC can't be decoded correctly
else
{
for (int i = 0; i < matrix.Length; ++i)
{
timeslotResult[i] = inputData[i];
objects[i].Position = channelPositions[(int)matrix[i]] * Listener.EnvironmentSize;
if (ChannelPrototype.Mapping[(int)matrix[i]].LFE) // LFE is handled elsewhere
{
objects[i].Position = default;
Array.Clear(timeslotResult[i], 0, timeslotResult[i].Length);
}
}
for (int i = matrix.Length; i < timeslotResult.Length; ++i)
{
objects[i].Position = default;
Array.Clear(timeslotResult[i], 0, timeslotResult[i].Length);
}
}
}
/// <summary>
/// Set up the renderer for a number of standard channels.
/// </summary>
protected void SetupChannels(int count)
{
ReferenceChannel[] matrix = ChannelPrototype.GetStandardMatrix(count);
for (int channel = 0; channel < count; ++channel)
{
Source source = new StreamMasterSource(reader, channel)
{
Position = channelPositions[(int)matrix[channel]] * Listener.EnvironmentSize
};
objects.Add(source);
}
FinishSetup(count);
}
void ProcessImpulse(object sender, RoutedEventArgs e)
{
if (browser.ShowDialog().Value)
{
AudioReader reader = AudioReader.Open(browser.FileName);
float[] impulse = reader.Read();
float gain = 1;
if (keepGain.IsChecked.Value)
{
gain = WaveformUtils.GetPeak(impulse);
}
if (commonEQ.IsChecked.Value)
{
ProcessCommon(reader, ref impulse);
}
else
{
ProcessPerChannel(reader, ref impulse);
}
if (keepGain.IsChecked.Value)
{
WaveformUtils.Gain(impulse, gain / WaveformUtils.GetPeak(impulse));
}
BitDepth bits = reader.Bits;
if (forceFloat.IsChecked.Value)
{
bits = BitDepth.Float32;
}
int targetLen = QMath.Base2Ceil((int)reader.Length);
if (separateExport.IsChecked.Value)
{
ReferenceChannel[] channels = ChannelPrototype.GetStandardMatrix(reader.ChannelCount);
for (int ch = 0; ch < reader.ChannelCount; ++ch)
{
string exportName = Path.GetFileName(browser.FileName);
int idx = exportName.LastIndexOf('.');
string channelName = ChannelPrototype.Mapping[(int)channels[ch]].Name;
exporter.FileName = $"{exportName[..idx]} - {channelName}{exportName[idx..]}";
/// <summary>
/// Generate the next <paramref name="samples"/> samples to be retrieved with <see cref="RetrieveSamples(ReferenceChannel)"/>.
/// </summary>
public void GenerateSamples(int samples)
{
// Preparations
ReferenceChannel[] layout = ChannelPrototype.GetStandardMatrix(source.Channels);
if (output[0].lastSamples.Length != samples)
{
for (int channel = 0; channel < output.Length; ++channel)
{
output[channel].lastSamples = null;
}
cache = new float[source.Channels][];
for (int channel = 0; channel < source.Channels; ++channel)
{
cache[channel] = new float[samples];
int channelId = GetChannelId(layout[channel]);
if (channelId != -1)
{
output[channelId].lastSamples = cache[channel]; // Cache linked with output, no need to copy
}
}
for (int channel = 0; channel < output.Length; ++channel)
{
if (output[channel].lastSamples == null)
{
output[channel].lastSamples = new float[samples];
}
}
}
for (int channel = 0; channel < output.Length; ++channel)
{
output[channel].writtenTo = false;
}
// Fetch samples
source.GetData(cache, timeSamples);
if (timeSamples >= source.Samples)
{
if (loop)
{
timeSamples %= source.Samples;
}
else
{
timeSamples = 0;
OnPlaybackFinished();
}
}
timeSamples += samples;
for (int channel = 0; channel < source.Channels; ++channel)
{
output[GetChannelId(layout[channel])].writtenTo = true;
}
// Create missing channels via matrix if asked for
if (matrixUpmix)
{
if (output[0].writtenTo && output[1].writtenTo) // Left and right channels available
{
if (!output[2].writtenTo) // Create discrete middle channel
{
float[] left = output[0].lastSamples, right = output[1].lastSamples, center = output[2].lastSamples;
for (int offset = 0; offset < samples; ++offset)
{
center[offset] = (left[offset] + right[offset]) * .5f;
}
output[2].writtenTo = true;
}
if (!output[6].writtenTo) // Matrix mix for sides
{
float[] leftFront = output[0].lastSamples, rightFront = output[1].lastSamples,
leftSide = output[6].lastSamples, rightSide = output[7].lastSamples;
for (int offset = 0; offset < samples; ++offset)
{
leftSide[offset] = (leftFront[offset] - rightFront[offset]) * .5f;
rightSide[offset] = -leftSide[offset];
}
output[6].writtenTo = output[7].writtenTo = true;
}
if (!output[4].writtenTo) // Extend sides to rears...
{
bool rearsAvailable = false; // ...but only if there are rears in the system
for (int channel = 0; channel < Listener.Channels.Length; ++channel)
{
float currentY = Listener.Channels[channel].Y;
if (currentY < -135 || currentY > 135)
{
rearsAvailable = true;
break;
}
}
if (rearsAvailable)
{
float[] leftSide = output[6].lastSamples, rightSide = output[7].lastSamples,
leftRear = output[4].lastSamples, rightRear = output[5].lastSamples;
for (int offset = 0; offset < samples; ++offset)
{
leftRear[offset] = leftSide[offset] *= .5f;
rightRear[offset] = rightSide[offset] *= .5f;
}
output[4].writtenTo = output[5].writtenTo = true;
}
}
}
}
}
/// <summary>
/// Read the next <paramref name="samples"/> and update the objects.
/// </summary>
/// <param name="samples">Samples per channel</param>
public override void Update(int samples)
{
if (lfeResult.Length != samples)
{
timeslotResult = new float[finalResult.Length][];
for (int obj = 0; obj < finalResult.Length; ++obj)
{
finalResult[obj] = new float[samples];
}
lfeTimeslot = new float[samples];
lfeResult = new float[samples];
}
if (inputData.Length != stream.ChannelCount)
{
inputData = new float[stream.ChannelCount][];
for (int channel = 0; channel < inputData.Length; ++channel)
{
inputData[channel] = new float[QuadratureMirrorFilterBank.subbands];
}
}
int pointer = 0;
while (pointer < samples)
{
if (timeslotPosition == 0)
{
RenderNextTimeslot();
}
int next = Math.Min(samples - pointer, QuadratureMirrorFilterBank.subbands - timeslotPosition);
for (int obj = 0; obj < finalResult.Length; ++obj)
{
for (int i = 0; i < next; ++i)
{
finalResult[obj][pointer + i] = timeslotResult[obj][timeslotPosition + i];
}
}
for (int i = 0; i < next; ++i)
{
lfeResult[pointer + i] = lfeTimeslot[timeslotPosition + i];
}
pointer += next;
timeslotPosition += next;
if (timeslotPosition == QuadratureMirrorFilterBank.subbands)
{
timeslotPosition = 0;
}
}
int lfe = ((EnhancedAC3Decoder)stream).Extensions.OAMD.GetLFEPosition();
if (lfe != -1)
{
for (int obj = 0; obj < lfe; ++obj)
{
objectSamples[obj] = finalResult[obj];
}
ReferenceChannel[] matrix = ChannelPrototype.GetStandardMatrix(stream.ChannelCount);
for (int i = 0; i < matrix.Length; ++i)
{
if (matrix[i] == ReferenceChannel.ScreenLFE)
{
objectSamples[lfe] = lfeResult;
break;
}
}
for (int obj = lfe + 1; obj < objectSamples.Length; ++obj)
{
objectSamples[obj] = finalResult[obj - 1];
}
}
else
{
for (int obj = 0; obj < objectSamples.Length; ++obj)
{
objectSamples[obj] = finalResult[obj];
}
}
}
/// <summary> /// Get the bed channels. /// </summary> public virtual ReferenceChannel[] GetChannels() => ChannelPrototype.GetStandardMatrix(stream.ChannelCount);
/// <summary> /// Loads a standard layout of the channel count of the imported file to a list of channels. /// </summary> void SetStandardLayout(ListBox holder) => holder.ItemsSource = (ReferenceChannel[])ChannelPrototype.GetStandardMatrix(reader.ChannelCount).Clone();