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Implementation uses SSSE3 intructions to perform 12-bit
sample pack/unpack operations to/from standard 16 and 32
bit host values. Input/output shuffle orderings for a
single 128-bit SSE register with 16-bit integers shown
below.
16-bit interleaved I/Q
---------------------------------------
| Q3 | I3 | Q2 | I2 | Q1 | I1 | Q0 | I0 | Input
---------------------------------------
| 127 0 |
12-bit packed I/Q byteswapped
-----------------------
| I0 | Q0 | I1 | 0
|-----------------------|
| I1 | Q1 | I2 | Q2 | Output
|-----------------------|
| Q2 | I3 | Q3 |
|-----------------------|
| Unused | 3
-----------------------
31 0
Fixes: #1740, #966
Related: #1739
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Create missing sc12-sc16 and sc16-sc12 type converters. To avoid
replicating the full sc12 converter class object, overload the
converter calls with C++11 std::enable_if metafunctions. When
used with std::is_floating and std::is_integral templates, this
allow a single template interface with compile time function
selection and static type checking.
Note the below std::enable_if interface is confusing, but quite
effective in this case.
typename enable_if<is_floating_point<type>::value>::type* = NULL
Fixes: #966
Related: #967, #1721
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types)
- Also removes all references to boost/cstdint.hpp and replaces it with
stdint.h (The 'correct' replacement would be <cstdint>, but not all of our
compilers support that).
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This patch addresses issue #648 "B200: TX with SC12 format and MIMO".
The observed MIMO header corruption was caused by overwriting the
end of the packed 12-bit sample output buffer. The overwrite was due to
the converter call always writing out 4 complex samples even if less
than 4 samples were available. The extra samples would corrupt data with
zero padding.
Avoid the overwrite condition by only writing the minimum number of
32-bit lines necessary rather than the entire 12 byte struct.
Samples 32-bit lines
1 1
2 2
3 3
4 3
Signed-off-by: Tom Tsou <tom@tsou.cc>
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