Decoding AAC SCE and LFE
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Part of Understanding AAC
Function Hierarchy
When FAAD2 wants to decode a SCE or LFE, this is the sequence of functions it calls in its internal hierarchy:
syntax.c:decode_sce_lfe() +- syntax.c:single_lfe_channel_element() +- syntax.c:individual_channel_stream() +- (SBR decoding stuff) +- specrec.c:reconstruct_single_channel()
decode_sce_lfe()
single_lfe_channel_element()
single_lfe_channel_element()
declare an ic_stream structure: ics declare an array of 1024 16-bit ints for spectral data: spec_data 4 bits: element instance tag individual_channel_stream(ics, spec_data) reconstruct_single_channel(ics, spec_data)
individual_channel_stream(ic_stream ics, spec_data[1024])
This process is detailed in Decoding AAC CPE.