| 5e58b0abe5b6c8f5bd96a8f78bbeeeb4d3892020 |
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24-Jun-2014 |
Andy Hung <hunga@google.com> |
Add floating point volume handling to AudioMixer
Use floating point volume in AudioMixer mixing when floating
point input is used with the new mixer engine.
AudioResampler is updated to take floating point volume to match.
Both legacy integer and floating point mixer engines work.
For now, integer volume is used when the new mixer engine
runs in integer input mode, for backward compatibility with
the legacy mixer. The new mixer engine will generally run in
floating point input mode. When the legacy path is removed,
the integer volumes will be removed.
Change-Id: I79e80c292ae7c8b8bdd0aa371a1b2c3a1b618290
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| 3348e36c51e91e78020bcc6578eda83d97c31bec |
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07-Jul-2014 |
Andy Hung <hunga@google.com> |
Replace int bitDepth with audio_format_t in Resampler
Remove mBitDepth from class (not used).
Replace with audio_format_t in factory method to distinguish
between float and pcm 16-bit.
Change-Id: I166860796c68285077ef4458d8758d19b82523f9
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| c4974312e5a1e2ab94eca56045f991baf1508d73 |
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14-Dec-2012 |
Glenn Kasten <gkasten@google.com> |
Fix build warnings
Change-Id: I9e3cfa0c6b3467fe763ce55f759d179f02c5deea
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| 7492a7ff46a75b5d8e10ae11d4ad50429cf945ce |
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10-Nov-2012 |
Mathias Agopian <mathias@google.com> |
more optimizations...
calculate the offsets from the phase differently, this happens
to reduce the register pressure in the main loop, which in turns
allows the compiler to generate much better code (doesn't need
to spill a lot of stuff on the stack).
this gives another 15% performance increase
Change-Id: I2ce3479dd48b9e6941adb80e6d443d6e14d64d96
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| 0d585c85524eb5d398fadff5ca8dd43939ed9cb4 |
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10-Nov-2012 |
Mathias Agopian <mathias@google.com> |
refactor code to improve neon code
we want to make sure we don't transfer data from the
neon unit to the arm register file, as this can be quite
slow. instead we do all the calculation on the neon side
and write the result directly to main memory.
Change-Id: Ibb56664d3ab03098ae2798b75e2b6927ac900187
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| 46afbec3743f1d799f185273ff897d1f8e0175dd |
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04-Nov-2012 |
Mathias Agopian <mathias@google.com> |
change how we store the FIR coefficients
The coefficient table is now transposed and shows
much better its polyphase nature: we now have a FIR
per line, each line corresponding to a phase.
This doesn't change at all the results produced by
the filter, but allows us to make slightly better
use of the data cache and improves performance a bit
(although not as much as I thought it would).
The main benefit is that it is the first step
before we can make much larger optimizations
(like using NEON).
Change-Id: Iebf7695825dcbd41f25861efcaefbaa3365ecb43
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| a798c97386a842d06d290797ba5dce95d031332a |
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04-Nov-2012 |
Mathias Agopian <mathias@google.com> |
improve SINC resampler performance
The improvement is about 60% by just tweaking a few
things to help the compiler generate better code.
It turns out that inlining too much stuff manually was hurting us.
Change-Id: I8068f0f75051f95ac600e50ce552572dd1e8c304
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| 443e69625d598ea578e2c838960778ce498fd773 |
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26-Oct-2012 |
Mathias Agopian <mathias@google.com> |
improve SINC resampler coefficients
- we increase the interpolation precision from 4 to 7 bits
this doesn't increase CPU power required, it only increases the
size of the filter table but significantly reduces the noise
introduced by the quantization of the impulse response.
- the parameters of the filter are set such that aliasing is
rejected at 80 dB below 20 KHz. Because we don't use a lot of
coefficient (to save compute power), there are quite a bit of
attenuation in the pass-band: starting at 9KHz for the
down-sampler (48 to 44.1), and starting at 13 KHz for the
up-sampler (44.1 to 48) -- the transition band is about 15 KHz.
Change-Id: I855548d2aab8a0fb0d2a2da3a364b6842d7d3838
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| ac6020508acedd316391dee42329040bf45f8d90 |
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01-Oct-2012 |
Glenn Kasten <gkasten@google.com> |
Integrate improved coefficient sinc resampler: VHQ
Summary:
Very high quality is enabled only for 44.1 -> 48 or 48 -> 44.1,
and uses low quality for all other use cases.
Track estimated CPU load and throttles the quality based on load;
as currently configured it should allow up to 2 instances of very high quality.
Medium quality and high quality are currently disabled unless explicitly requested.
Details:
Only load .so the first time it is needed.
Cleanup code style: formatting, indentation, whitespace.
Restore medium quality resampler, but it is not used (see next line).
Fix memory leak for sinc resampler.
Check sample rate in resampler constructor.
Add logs for debugging.
Rename DEFAULT to DEFAULT_QUALITY for consistency with other quality levels.
Renumber VERY_HIGH_QUALITY from 255 to 4.
Use enum src_quality consistently.
Improve parsing of property af.resampler.quality.
Fix reentrancy bug - allow an instance of high quality and an instance
of very high quality to both be active concurrently.
Bug: 7229644
Change-Id: I0ce6b913b05038889f50462a38830b61a602a9f7
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| 76b111685010e1fea7c0a865c038aee35507fde4 |
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17-Jan-2012 |
SathishKumar Mani <smani@codeaurora.org> |
audioflinger: use resample coefficients from audio-resampler library.
-Add a separate quality VERY_HIGH_QUALITY in resampler
-Use resample coefficients audio-resampler library for
quality VERY_HIGH_QUALITY.
-This improves the quality of resampled output.
Bug: 7024293
Change-Id: Ia44142413bed5f5963d7eab7846eec877a2415e4
Signed-off-by: Iliyan Malchev <malchev@google.com>
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| c19e22450e6e3d07594c935c7a9522e85e909e82 |
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30-Jan-2012 |
Glenn Kasten <gkasten@google.com> |
Use virtual destructors
It turns out to be just a comment, as all except AudioMixer are RefBase.
There are only a few performance-sensitive cases where it's worth thinking
about whether you need a virtual destructor, and the headache usually
outweighs the benefit.
Change-Id: I716292f9556ec17c29ce8c76ac8ae602cb496533
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| 54c3b66444ebfb9f2265ee70ac3b76ccefa0506a |
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06-Jan-2012 |
Glenn Kasten <gkasten@google.com> |
By convention const goes before the type specifier
Change-Id: I70203abd6a6f54e5bd9f1412800cc01212157e58
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
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| 65ab47156e1c7dfcd8cc4266253a5ff30219e7f0 |
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15-Jul-2010 |
Mathias Agopian <mathias@google.com> |
move native services under services/
moved surfaceflinger, audioflinger, cameraservice
all native services should now reside in this location.
Change-Id: Iee42b83dd2a94c3bf5107ab0895fe2dfcd5337a8
/frameworks/av/services/audioflinger/AudioResamplerSinc.h
|