protected IFrameDecoder retrieveDecoder(Header header, Bitstream stream, int layer)
{
IFrameDecoder decoder = null;
// REVIEW: allow channel output selection type
// (LEFT, RIGHT, BOTH, DOWNMIX)
switch (layer)
{
case 3:
if (l3decoder == null)
{
l3decoder = new LayerIIIDecoder(stream,
header, filter1, filter2,
output, OutputChannels.Both);
}
decoder = l3decoder;
break;
case 2:
if (l2decoder == null)
{
l2decoder = new LayerIIDecoder();
l2decoder.create(stream,
header, filter1, filter2,
output, OutputChannels.Both);
}
decoder = l2decoder;
break;
case 1:
if (l1decoder == null)
{
l1decoder = new LayerIDecoder();
l1decoder.create(stream,
header, filter1, filter2,
output, OutputChannels.Both);
}
decoder = l1decoder;
break;
}
if (decoder == null)
{
throw new DecoderException(Errors.UNSUPPORTED_LAYER);
}
return(decoder);
}
