6 Bitstream
26.4043GPPEnhanced aacPlus encoder Spectral Band Replication (SBR) partEnhanced aacPlus general audio codecGeneral audio codec audio processing functionsRelease 17TS
Figure 10 below gives a brief hierarchical representation of the SBR and parametric stereo parts of the aacPlus bitstream, with references to the corresponding decoder specifications. An overview of sbr_extension_data() is given in [1], Figure 4.19A, and subclause 4.4.2.8 of [1] defines the syntax. Clearly, the operation of the SBR Bitstream Multiplexer in Figure 5 is defined by this syntax. The optional CRC calculation is also defined by the decoder description [1], subclause 4.5.2.8.1. For convenience, pointers to the relevant sections in the present document are given within paranthesises in Figure 10.
extension_payload() [1], Amendment Subpart 4, Table 4.51
sbr_extension_data() [1], Subclause 4.4.2.8, Table 4.54A
sbr_header() ", ", Table 4.55A (5.3)
sbr_data() ", ", Table 4.56A
sbr_single_channel_element() ", ", Table 4.57A
sbr_grid() ", ", Table 4.61A (5.4.3)
sbr_dtdf() ", ", Table 4.62A (5.8)
sbr_invf() ", ", Table 4.63A (5.6.4)
sbr_envelope() ", ", Table 4.64A (5.5, 5.7, 5.8)
sbr_noise() ", ", Table 4.65A (5.6.3, 5.7, 5.8)
sbr_sinusoidal_coding() ", ", Table 4.66A (5.6.5)
sbr_extension() [7], Subclause 8.A.2, Table 8.A.1
ps_data() [7], Subclause 8.4.1, Table 8.1
Figure 10: Enhanced aacPlus with parametric stereo bitstream hierarchy
Annex A (informative):
Change history
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Change history |
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Date |
TSG SA# |
TSG Doc. |
CR |
Rev |
Subject/Comment |
Old |
New |
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2004-09 |
25 |
SP-040636 |
Approved at SA#25 |
2.0.0 |
6.0.0 |
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2007-09 |
36 |
Version for Release 7 |
6.0.0 |
7.0.0 |
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2008-12 |
42 |
Version for Release 8 |
7.0.0 |
8.0.0 |
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2009-12 |
46 |
Version for Release 9 |
8.0.0 |
9.0.0 |
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2011-03 |
51 |
Version for Release 10 |
9.0.0 |
10.0.0 |
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2012-09 |
57 |
Version for Release 11 |
10.0.0 |
11.0.0 |
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2014-09 |
65 |
Version for Release 12 |
11.0.0 |
12.0.0 |
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2015-12 |
70 |
Version for Release 13 |
12.0.0 |
13.0.0 |
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Change history |
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Date |
Meeting |
TDoc |
CR |
Rev |
Cat |
Subject/Comment |
New version |
|
2017-03 |
75 |
Version for Release 14 |
14.0.0 |
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2018-06 |
80 |
Version for Release 15 |
15.0.0 |
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2020-07 |
– |
– |
– |
– |
– |
Update to Rel-16 version (MCC) |
16.0.0 |
|
2022-04 |
– |
– |
– |
– |
– |
Update to Rel-17 version (MCC) |
17.0.0 |