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ffmpeg-0.6.3
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${ noResults }
5 Commits (e9bb586543d83fe0ed901834b853b6d64e327529)
| Author | SHA1 | Message | Date |
|---|---|---|---|
Lynne
|
134dba9544
|
opusdsp: add ability to modify deemphasis constant
xHE-AAC relies on the same postfilter mechanism that Opus uses to improve clarity (albeit with a steeper deemphasis filter). The code to apply it is identical, it's still just a simple IIR low-pass filter. This commit makes it possible to use alternative constants. |
9 months ago |
Martin Storsjö
|
a76b409dd0 |
aarch64: Reindent all assembly to 8/24 column indentation
libavcodec/aarch64/vc1dsp_neon.S is skipped here, as it intentionally uses a layered indentation style to visually show how different unrolled/interleaved phases fit together. Signed-off-by: Martin Storsjö <martin@martin.st> |
1 year ago |
|
Martin Storsjö
|
7f905f3672 |
aarch64: Make the indentation more consistent
Some functions have slightly different indentation styles; try to match the surrounding code. libavcodec/aarch64/vc1dsp_neon.S is skipped here, as it intentionally uses a layered indentation style to visually show how different unrolled/interleaved phases fit together. Signed-off-by: Martin Storsjö <martin@martin.st> |
1 year ago |
|
Lynne
|
aac382e9e5 |
aarch64/opusdsp: do not clobber register v8
A part of v8-v15 needs to be preserved across calls. |
5 years ago |
|
Lynne
|
4d2f62150d |
aarch64/opusdsp: implement NEON accelerated postfilter and deemphasis
153372 UNITS in postfilter_c, 65536 runs, 0 skips
73164 UNITS in postfilter_neon, 65536 runs, 0 skips -> 2.1x speedup
80591 UNITS in deemphasis_c, 131072 runs, 0 skips
43969 UNITS in deemphasis_neon, 131072 runs, 0 skips -> 1.83x speedup
Total decoder speedup: ~15% on a Raspberry Pi 3 (from 28.1x to 33.5x realtime)
Deemphasis SIMD based on the following unrolling:
const float c1 = CELT_EMPH_COEFF, c2 = c1*c1, c3 = c2*c1, c4 = c3*c1;
float state = coeff;
for (int i = 0; i < len; i += 4) {
y[0] = x[0] + c1*state;
y[1] = x[1] + c2*state + c1*x[0];
y[2] = x[2] + c3*state + c1*x[1] + c2*x[0];
y[3] = x[3] + c4*state + c1*x[2] + c2*x[1] + c3*x[0];
state = y[3];
y += 4;
x += 4;
}
Unlike the x86 version, duplication is used instead of pslldq so
the structure and tables are different.
|
6 years ago |