/// <summary>
/// Parse an E-AC-3 decoder to a renderer.
/// </summary>
public EnhancedAC3Renderer(EnhancedAC3Decoder stream) : base(stream)
{
// Object-based rendering
if (HasObjects = stream.Extensions.HasObjects)
{
ObjectAudioMetadata oamd = stream.Extensions.OAMD;
JointObjectCoding joc = stream.Extensions.JOC;
DynamicObjects = joc.ObjectCount;
finalResult = new float[joc.ObjectCount][];
applier = new JointObjectCodingApplier(joc.ObjectCount, stream.FrameSize);
SetupObjects(oamd.ObjectCount);
}
// Channel-based rendering
else
{
ReferenceChannel[] channels = stream.GetChannels();
for (int channel = 0; channel < channels.Length; ++channel)
{
Source source = new StreamMasterSource(reader, channel)
{
Position = channelPositions[(int)channels[channel]] * Listener.EnvironmentSize
};
objects.Add(source);
}
finalResult = new float[channels.Length][];
FinishSetup(channels.Length);
}
}
/// <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);
}
}
}
