Decoding AAC FIL: Difference between revisions
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''Part of [[Understanding AAC]]'' | |||
This can apparently be used for extension data since libfaad2 checks for SBR data in the FIL chunk which is known to be applicable to later HE-AAC variants. There are other extension data types in the syntax. According to the libfaad2 logic, a FIL element can have either an SBR chunk or a series of other extension types. These are the defined extension types: | This can apparently be used for extension data since libfaad2 checks for SBR data in the FIL chunk which is known to be applicable to later HE-AAC variants. There are other extension data types in the syntax. According to the libfaad2 logic, a FIL element can have either an SBR chunk or a series of other extension types. These are the defined extension types: | ||
Revision as of 15:14, 5 March 2006
Part of Understanding AAC
This can apparently be used for extension data since libfaad2 checks for SBR data in the FIL chunk which is known to be applicable to later HE-AAC variants. There are other extension data types in the syntax. According to the libfaad2 logic, a FIL element can have either an SBR chunk or a series of other extension types. These are the defined extension types:
- 1: FILL_DATA
- 2: DATA_ELEMENT
- 11: DYNAMIC_RANGE
- 12: SBR_DATA
- 13: SBR_DATA_CRC
local count local extra_count local extension_type 4 bits: count if (count == 15) 8 bits: extra_count count += extra_count 4 bits: extension_type
FILL_DATA:
4 bits: must be 0000b foreach 0..count-2 8 bits: must be 0xA5 (10100101b)
DATA_ELEMENT: [unfinished]
DYNAMIC_RANGE: [unfinished]
SBR_DATA: [unfinished]
SBR_DATA_CRC: [unfinished]