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path: root/services/audioflinger/AudioResamplerSinc.h
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* Add floating point volume handling to AudioMixerAndy Hung2014-07-081-1/+1
| | | | | | | | | | | | | | | 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
* Replace int bitDepth with audio_format_t in ResamplerAndy Hung2014-07-071-1/+1
| | | | | | | | 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
* Fix build warningsGlenn Kasten2012-12-171-2/+2
| | | | Change-Id: I9e3cfa0c6b3467fe763ce55f759d179f02c5deea
* more optimizations...Mathias Agopian2012-11-101-3/+0
| | | | | | | | | | | 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
* refactor code to improve neon codeMathias Agopian2012-11-101-1/+4
| | | | | | | | | 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
* change how we store the FIR coefficientsMathias Agopian2012-11-051-1/+2
| | | | | | | | | | | | | | | | | 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
* improve SINC resampler performanceMathias Agopian2012-11-051-1/+1
| | | | | | | | 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
* improve SINC resampler coefficientsMathias Agopian2012-10-261-1/+1
| | | | | | | | | | | | | | | | - 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
* Integrate improved coefficient sinc resampler: VHQGlenn Kasten2012-10-041-19/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | 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
* audioflinger: use resample coefficients from audio-resampler library.SathishKumar Mani2012-09-261-7/+17
| | | | | | | | | | | -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>
* Use virtual destructorsGlenn Kasten2012-02-031-1/+1
| | | | | | | | | | 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
* By convention const goes before the type specifierGlenn Kasten2012-01-061-4/+4
| | | | Change-Id: I70203abd6a6f54e5bd9f1412800cc01212157e58
* move native services under services/Mathias Agopian2010-07-141-0/+88
moved surfaceflinger, audioflinger, cameraservice all native services should now reside in this location. Change-Id: Iee42b83dd2a94c3bf5107ab0895fe2dfcd5337a8
generated by cgit v1.1 at 2025-01-21 21:56:26 +0000