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N
ffmpeg-0.6.3
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${ noResults }
6 Commits (339d8fb3532a9c0ddd3d4902b798cd220f616919)
| Author | SHA1 | Message | Date |
|---|---|---|---|
Ben Avison
|
42c1cc35b7 |
armv6: Accelerate ff_imdct_half for general case (mdct_bits != 6)
The previous implementation targeted DTS Coherent Acoustics, which only
requires mdct_bits == 6. This relatively small size lent itself to
unrolling the loops a small number of times, and encoding offsets
calculated at assembly time within the load/store instructions of each
iteration.
In the more general case (codecs such as AAC and AC3) much larger arrays
are used - mdct_bits == [8, 9, 11]. The old method does not scale for
these cases, so more integer registers are used with non-unrolled versions
of the loops (and with some stack spillage). The postrotation filter loop
is still unrolled by a factor of 2 to permit the double-buffering of some
VFP registers to facilitate overlap of neighbouring iterations.
I benchmarked the result by measuring the number of gperftools samples
that hit anywhere in the AAC decoder (starting from aac_decode_frame())
or specifically in ff_imdct_half_c / ff_imdct_half_vfp, for the same
example AAC stream:
Before After
Mean StdDev Mean StdDev Confidence Change
aac_decode_frame 2368.1 35.8 2117.2 35.3 100.0% +11.8%
ff_imdct_half_* 457.5 22.4 251.2 16.2 100.0% +82.1%
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
|
11 years ago |
Martin Storsjö
|
69e6702c01 |
arm: Mangle external symbols properly in new vfp assembly files
Signed-off-by: Martin Storsjö <martin@martin.st> |
12 years ago |
|
Martin Storsjö
|
47d57f24e3 |
arm: Mangle external symbols properly in new vfp assembly files
Reviewed-by: Kostya Shishkov Signed-off-by: Michael Niedermayer <michaelni@gmx.at> |
12 years ago |
|
Martin Storsjö
|
8b9eba664e |
arm: Add VFP-accelerated version of fft16
Before After
Mean StdDev Mean StdDev Change
This function 1389.3 4.2 967.8 35.1 +43.6%
Overall 15577.5 83.2 15400.0 336.4 +1.2%
Signed-off-by: Martin Storsjö <martin@martin.st>
|
12 years ago |
|
Martin Storsjö
|
b63bb251ea |
arm: Add VFP-accelerated version of imdct_half
Before After
Mean StdDev Mean StdDev Change
This function 2653.0 28.5 1108.8 51.4 +139.3%
Overall 17049.5 408.2 15973.0 223.2 +6.7%
Signed-off-by: Martin Storsjö <martin@martin.st>
|
12 years ago |