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[Cs-dev] Csound in Android 5

Date2014-12-06 18:13
FromSimonKenny
Subject[Cs-dev] Csound in Android 5
As of the new Android OS update to major version 5 there are apparently some
audio latency reductions and greater support for hardware peripherals.

>From the Android Lollipop page,

"Lower latency audio input ensuring that music and communication
applications that have strict delay requirements provide an amazing realtime
experience"

"Multi-channel audio stream mixing means professional audio applications can
now mix up to eight channels including 5.1 and 7.1 channels"

"USB Audio support means you can plug USB microphones, speakers, and a
myriad of other USB audio devices like amplifiers and mixers into your
Android device"

I am personally very interested in reducing latency specifically as I'm just
about the release a commercial app for Android which uses Csound. Having
updated to the new Android 5, there doesn't seem to be any immediate
automatic reduction. I assume this needs to be optimised for Android 5 at a
low level. I'd be willing to work on this with whoever is maintaining the
Android API as I'm very invested in seeing performance increases!

Are there any plans to take advantage of this?



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Date2014-12-06 18:47
FromVictor Lazzarini
SubjectRe: [Cs-dev] Csound in Android 5
There has been no change in the NDK and OpenSL ES (as far as I can see), so I guess it’s
a question of trying to see if smaller buffer sizes now work (-B and -b). The point is to
reduce them so that -b is of the order of ksmps (64,32) and -B about 4 times that value.

With 4.4, I am not able to reduce -B to less than 1024. But even 1024 is giving me more
than 1024 sample frames of latency there.

If low-latency is promised but not achieved, I can look at the code to see if I can figure out
something else, but I will need to get a 5.0 device to test first (my tablet OS has not been updated yet).

Regards
========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 6 Dec 2014, at 18:13, SimonKenny  wrote:
> 
> As of the new Android OS update to major version 5 there are apparently some
> audio latency reductions and greater support for hardware peripherals.
> 
>> From the Android Lollipop page,
> 
> "Lower latency audio input ensuring that music and communication
> applications that have strict delay requirements provide an amazing realtime
> experience"
> 
> "Multi-channel audio stream mixing means professional audio applications can
> now mix up to eight channels including 5.1 and 7.1 channels"
> 
> "USB Audio support means you can plug USB microphones, speakers, and a
> myriad of other USB audio devices like amplifiers and mixers into your
> Android device"
> 
> I am personally very interested in reducing latency specifically as I'm just
> about the release a commercial app for Android which uses Csound. Having
> updated to the new Android 5, there doesn't seem to be any immediate
> automatic reduction. I assume this needs to be optimised for Android 5 at a
> low level. I'd be willing to work on this with whoever is maintaining the
> Android API as I'm very invested in seeing performance increases!
> 
> Are there any plans to take advantage of this?
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Csound-in-Android-5-tp5739058.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
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Date2014-12-15 17:38
FromSimonKenny
SubjectRe: [Cs-dev] Csound in Android 5
Hi Victor

Thank you for your reply.

I can replicate your findings that anything less than 1024 for the hardware
buffer size (-B) gives sound problems. Also you are saying then that the
software buffer size (-b) should be no less than 256? And should ksmps still
be around 32 or 64?

I've also noticed that the AUDIO_OUTOUT_FAST_FLAG is not being accepted by
the AudioTrack library. Here's part of a log:
12-15 16:15:34.113: D/CsoundObj(23005): --Csound version 6.04 (float
samples) Dec  1 2014
12-15 16:15:34.113: D/CsoundObj(23005): graphics suppressed, ascii
substituted
12-15 16:15:34.113: D/CsoundObj(23005): 0dBFS level = 1.0
12-15 16:15:34.114: D/CsoundObj(23005): orch now loaded
12-15 16:15:34.114: D/CsoundObj(23005): audio buffered in 2048 sample-frame
blocks
12-15 16:15:34.114: W/libOpenSLES(23005): class OutputMix interface 0
requested but unavailable MPH=43
12-15 16:15:34.118: W/AudioTrack(23005): AUDIO_OUTPUT_FLAG_FAST denied by
client
12-15 16:15:34.123: D/CsoundObj(23005): writing 4096 sample blks of 32-bit
floats to dac 

You can see a larger log as well as references to the description of the
system, and a link to the code that accepts or denies the flag here:
https://docs.google.com/document/d/1g9-M8NRrzRkiEVfNZOrQuULVbMKiSaytBJGQAtlCOIE/edit?usp=sharing

I'm wondering two thins about this:
(1) Is it problematic if the buffer sizes requested via -B and -b command
line flags are different from the  buffer sizes above?
(2) Is the AUDIO_OUTOUT_FLAG_FAST denial very bad for latency or
inconsequential?

By the way, my Nexus 7 2013 edition can update to Android 5, if you have
access to one this will work.


Thanks for your time



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Date2014-12-16 14:53
FromVictor Lazzarini
SubjectRe: [Cs-dev] Csound in Android 5
What version of Android is this?

I would think that -b can be lowered down to the ksmps value, but I am not sure whether that would help. 

I have to look at the flag you mentioned. I think this is defined by the hw. If the hw does not support it, then it can't be set.

Victor Lazzarini
Dean of Arts, Celtic Studies, and Philosophy
Maynooth University
Ireland

> On 15 Dec 2014, at 17:38, SimonKenny  wrote:
> 
> Hi Victor
> 
> Thank you for your reply.
> 
> I can replicate your findings that anything less than 1024 for the hardware
> buffer size (-B) gives sound problems. Also you are saying then that the
> software buffer size (-b) should be no less than 256? And should ksmps still
> be around 32 or 64?
> 
> I've also noticed that the AUDIO_OUTOUT_FAST_FLAG is not being accepted by
> the AudioTrack library. Here's part of a log:
> 12-15 16:15:34.113: D/CsoundObj(23005): --Csound version 6.04 (float
> samples) Dec  1 2014
> 12-15 16:15:34.113: D/CsoundObj(23005): graphics suppressed, ascii
> substituted
> 12-15 16:15:34.113: D/CsoundObj(23005): 0dBFS level = 1.0
> 12-15 16:15:34.114: D/CsoundObj(23005): orch now loaded
> 12-15 16:15:34.114: D/CsoundObj(23005): audio buffered in 2048 sample-frame
> blocks
> 12-15 16:15:34.114: W/libOpenSLES(23005): class OutputMix interface 0
> requested but unavailable MPH=43
> 12-15 16:15:34.118: W/AudioTrack(23005): AUDIO_OUTPUT_FLAG_FAST denied by
> client
> 12-15 16:15:34.123: D/CsoundObj(23005): writing 4096 sample blks of 32-bit
> floats to dac 
> 
> You can see a larger log as well as references to the description of the
> system, and a link to the code that accepts or denies the flag here:
> https://docs.google.com/document/d/1g9-M8NRrzRkiEVfNZOrQuULVbMKiSaytBJGQAtlCOIE/edit?usp=sharing
> 
> I'm wondering two thins about this:
> (1) Is it problematic if the buffer sizes requested via -B and -b command
> line flags are different from the  buffer sizes above?
> (2) Is the AUDIO_OUTOUT_FLAG_FAST denial very bad for latency or
> inconsequential?
> 
> By the way, my Nexus 7 2013 edition can update to Android 5, if you have
> access to one this will work.
> 
> 
> Thanks for your time
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Csound-in-Android-5-tp5739058p5739274.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
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Date2014-12-16 16:18
FromSimonKenny
SubjectRe: [Cs-dev] Csound in Android 5
I'm building for Api 19 (v4.4 KitKat) and testing on Nexus 7 2013 with
Android 5.0.1.

Having read the CsoundObj java wrapper code in more detail today I
discovered that there is another constructor which takes the boolean
argument /useAudioTrack/ that I was unaware of. This is set to false by
default constructor. When I set this flag true I do not get the AudioTrack
warning as previously described, there is no warning.

However, now Csound (almost always) crashes the app if either or both -B and
-b flags are used. If neither are used, Csound starts and operates normally.
In fact I think there is a performance increase when /useAudioTrack/ is set
but I have to verify that.

The crash is either silent, without an error message, or sometimes I get
this:

12-16 15:54:02.050: A/libc(32178): Pure virtual function called. Are you
calling virtual methods from a destructor?
12-16 15:54:02.052: D/CsoundObj(32178): WARNING: 
12-16 15:54:02.052: D/CsoundObj(32178): Csound not ready for performance:
csoundStart() has not been called 

The -b flag seems to set X in the "audio buffered in X sample-frame blocks"
message during Csound start, seen in the following log:

12-16 15:55:46.295: D/CsoundObj(32440): --Csound version 6.04 (float
samples) Dec  1 2014
12-16 15:55:46.295: D/CsoundObj(32440): 0dBFS level = 1.0
12-16 15:55:46.296: D/CsoundObj(32440): orch now loaded
12-16 15:55:46.296: D/CsoundObj(32440): audio buffered in 256 sample-frame
blocks
12-16 15:55:46.296: D/CsoundObj(32440): SECTION 1:
12-16 15:55:46.296: D/CsoundObj(32440): Return Value2: 0
12-16 15:55:46.296: D/csound(32440): Setup called
12-16 15:55:46.296: D/csound(32440): Trying to get internal pointers...
12-16 15:55:46.300: D/csound(32440): Got SP pointers
12-16 15:55:46.301: D/csound(32440): Got I O pointers
12-16 15:55:46.305: D/CsoundObj(32440): Buffer Size: 7056
12-16 15:55:46.306: D/CsoundObj(32440): Multiplier: 32767.0 : 3.051851E-5

It's interesting to see the "Buffer Size: 7056" message. This must be the
hardware buffer?

In any case I'm seeing some better stability with /useAudioTrack/, as
sometimes Csound would crash the app for no apparent reason, or not one I
could pin down, and I haven't gotten this yet. And there seems to be less
latency between screen touch and sound. I will measure this, comparing with
and without setting /useAudioTrack/.



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Date2014-12-16 17:20
FromVictor Lazzarini
SubjectRe: [Cs-dev] Csound in Android 5
That boolean argument switches off the NDK audio backend (OpenSL) and
uses the Java code only. That is not recommended (it is there for backwards
compatibility).

I think it will not help me to have you doing these tests, as you are shooting in
the dark. The only thing is for me to wait until I can get a 5.0 tablet to test.

Regards
========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 16 Dec 2014, at 16:18, SimonKenny  wrote:
> 
> I'm building for Api 19 (v4.4 KitKat) and testing on Nexus 7 2013 with
> Android 5.0.1.
> 
> Having read the CsoundObj java wrapper code in more detail today I
> discovered that there is another constructor which takes the boolean
> argument /useAudioTrack/ that I was unaware of. This is set to false by
> default constructor. When I set this flag true I do not get the AudioTrack
> warning as previously described, there is no warning.
> 
> However, now Csound (almost always) crashes the app if either or both -B and
> -b flags are used. If neither are used, Csound starts and operates normally.
> In fact I think there is a performance increase when /useAudioTrack/ is set
> but I have to verify that.
> 
> The crash is either silent, without an error message, or sometimes I get
> this:
> 
> 12-16 15:54:02.050: A/libc(32178): Pure virtual function called. Are you
> calling virtual methods from a destructor?
> 12-16 15:54:02.052: D/CsoundObj(32178): WARNING: 
> 12-16 15:54:02.052: D/CsoundObj(32178): Csound not ready for performance:
> csoundStart() has not been called 
> 
> The -b flag seems to set X in the "audio buffered in X sample-frame blocks"
> message during Csound start, seen in the following log:
> 
> 12-16 15:55:46.295: D/CsoundObj(32440): --Csound version 6.04 (float
> samples) Dec  1 2014
> 12-16 15:55:46.295: D/CsoundObj(32440): 0dBFS level = 1.0
> 12-16 15:55:46.296: D/CsoundObj(32440): orch now loaded
> 12-16 15:55:46.296: D/CsoundObj(32440): audio buffered in 256 sample-frame
> blocks
> 12-16 15:55:46.296: D/CsoundObj(32440): SECTION 1:
> 12-16 15:55:46.296: D/CsoundObj(32440): Return Value2: 0
> 12-16 15:55:46.296: D/csound(32440): Setup called
> 12-16 15:55:46.296: D/csound(32440): Trying to get internal pointers...
> 12-16 15:55:46.300: D/csound(32440): Got SP pointers
> 12-16 15:55:46.301: D/csound(32440): Got I O pointers
> 12-16 15:55:46.305: D/CsoundObj(32440): Buffer Size: 7056
> 12-16 15:55:46.306: D/CsoundObj(32440): Multiplier: 32767.0 : 3.051851E-5
> 
> It's interesting to see the "Buffer Size: 7056" message. This must be the
> hardware buffer?
> 
> In any case I'm seeing some better stability with /useAudioTrack/, as
> sometimes Csound would crash the app for no apparent reason, or not one I
> could pin down, and I haven't gotten this yet. And there seems to be less
> latency between screen touch and sound. I will measure this, comparing with
> and without setting /useAudioTrack/.
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Csound-in-Android-5-tp5739058p5739281.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
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Date2014-12-16 17:51
FromMichael Gogins
SubjectRe: [Cs-dev] Csound in Android 5
On Android 4.4 I use ksmps=960, -b1920, -B3840 --sample-accurate.
Latency is bad, but performance is OK.

Regards,
Mike

-----------------------------------------------------
Michael Gogins
Irreducible Productions
http://michaelgogins.tumblr.com
Michael dot Gogins at gmail dot com


On Tue, Dec 16, 2014 at 9:53 AM, Victor Lazzarini
 wrote:
> What version of Android is this?
>
> I would think that -b can be lowered down to the ksmps value, but I am not sure whether that would help.
>
> I have to look at the flag you mentioned. I think this is defined by the hw. If the hw does not support it, then it can't be set.
>
> Victor Lazzarini
> Dean of Arts, Celtic Studies, and Philosophy
> Maynooth University
> Ireland
>
>> On 15 Dec 2014, at 17:38, SimonKenny  wrote:
>>
>> Hi Victor
>>
>> Thank you for your reply.
>>
>> I can replicate your findings that anything less than 1024 for the hardware
>> buffer size (-B) gives sound problems. Also you are saying then that the
>> software buffer size (-b) should be no less than 256? And should ksmps still
>> be around 32 or 64?
>>
>> I've also noticed that the AUDIO_OUTOUT_FAST_FLAG is not being accepted by
>> the AudioTrack library. Here's part of a log:
>> 12-15 16:15:34.113: D/CsoundObj(23005): --Csound version 6.04 (float
>> samples) Dec  1 2014
>> 12-15 16:15:34.113: D/CsoundObj(23005): graphics suppressed, ascii
>> substituted
>> 12-15 16:15:34.113: D/CsoundObj(23005): 0dBFS level = 1.0
>> 12-15 16:15:34.114: D/CsoundObj(23005): orch now loaded
>> 12-15 16:15:34.114: D/CsoundObj(23005): audio buffered in 2048 sample-frame
>> blocks
>> 12-15 16:15:34.114: W/libOpenSLES(23005): class OutputMix interface 0
>> requested but unavailable MPH=43
>> 12-15 16:15:34.118: W/AudioTrack(23005): AUDIO_OUTPUT_FLAG_FAST denied by
>> client
>> 12-15 16:15:34.123: D/CsoundObj(23005): writing 4096 sample blks of 32-bit
>> floats to dac
>>
>> You can see a larger log as well as references to the description of the
>> system, and a link to the code that accepts or denies the flag here:
>> https://docs.google.com/document/d/1g9-M8NRrzRkiEVfNZOrQuULVbMKiSaytBJGQAtlCOIE/edit?usp=sharing
>>
>> I'm wondering two thins about this:
>> (1) Is it problematic if the buffer sizes requested via -B and -b command
>> line flags are different from the  buffer sizes above?
>> (2) Is the AUDIO_OUTOUT_FLAG_FAST denial very bad for latency or
>> inconsequential?
>>
>> By the way, my Nexus 7 2013 edition can update to Android 5, if you have
>> access to one this will work.
>>
>>
>> Thanks for your time
>>
>>
>>
>> --
>> View this message in context: http://csound.1045644.n5.nabble.com/Csound-in-Android-5-tp5739058p5739274.html
>> Sent from the Csound - Dev mailing list archive at Nabble.com.
>>
>> ------------------------------------------------------------------------------
>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
>> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
>> with Interactivity, Sharing, Native Excel Exports, App Integration & more
>> Get technology previously reserved for billion-dollar corporations, FREE
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>> _______________________________________________
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>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>
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Date2014-12-16 18:15
FromVictor.Lazzarini@nuim.ie
SubjectRe: [Cs-dev] Csound in Android 5
AttachmentsNone  None  None  None  

Date2014-12-16 19:45
FromMichael Gogins
SubjectRe: [Cs-dev] Csound in Android 5
Thanks for the information, I'll try your settings.

Regards,
Mike

-----------------------------------------------------
Michael Gogins
Irreducible Productions
http://michaelgogins.tumblr.com
Michael dot Gogins at gmail dot com


On Tue, Dec 16, 2014 at 1:15 PM,   wrote:
> Very high ksmps. Here I can use ksmps=32, -b256 -B1024, on the Nexus &
> Samsung tablets.
> Latency is not great, better on the Nexus.
>
>
>
> ----- Original Message -----
> From: Michael Gogins 
> Date: Tuesday, December 16, 2014 5:52 pm
> Subject: Re: [Cs-dev] Csound in Android 5
> To: Developer discussions 
>
>> On Android 4.4 I use ksmps=960, -b1920, -B3840 --sample-accurate.
>> Latency is bad, but performance is OK.
>>
>> Regards,
>> Mike
>>
>> -----------------------------------------------------
>> Michael Gogins
>> Irreducible Productions
>> http://michaelgogins.tumblr.com
>> Michael dot Gogins at gmail dot com
>>
>>
>> On Tue, Dec 16, 2014 at 9:53 AM, Victor Lazzarini
>>  wrote:
>> > What version of Android is this?
>> >
>> > I would think that -b can be lowered down to the ksmps value,
>> but I am not sure whether that would help.
>> >
>> > I have to look at the flag you mentioned. I think this is
>> defined by the hw. If the hw does not support it, then it can't
>> be set.
>> >
>> > Victor Lazzarini
>> > Dean of Arts, Celtic Studies, and Philosophy
>> > Maynooth University
>> > Ireland
>> >
>> >> On 15 Dec 2014, at 17:38, SimonKenny 
>> wrote:>>
>> >> Hi Victor
>> >>
>> >> Thank you for your reply.
>> >>
>> >> I can replicate your findings that anything less than 1024
>> for the hardware
>> >> buffer size (-B) gives sound problems. Also you are saying
>> then that the
>> >> software buffer size (-b) should be no less than 256? And
>> should ksmps still
>> >> be around 32 or 64?
>> >>
>> >> I've also noticed that the AUDIO_OUTOUT_FAST_FLAG is not
>> being accepted by
>> >> the AudioTrack library. Here's part of a log:
>> >> 12-15 16:15:34.113: D/CsoundObj(23005): --Csound version 6.04
>> (float>> samples) Dec  1 2014
>> >> 12-15 16:15:34.113: D/CsoundObj(23005): graphics suppressed, ascii
>> >> substituted
>> >> 12-15 16:15:34.113: D/CsoundObj(23005): 0dBFS level = 1.0
>> >> 12-15 16:15:34.114: D/CsoundObj(23005): orch now loaded
>> >> 12-15 16:15:34.114: D/CsoundObj(23005): audio buffered in
>> 2048 sample-frame
>> >> blocks
>> >> 12-15 16:15:34.114: W/libOpenSLES(23005): class OutputMix
>> interface 0
>> >> requested but unavailable MPH=43
>> >> 12-15 16:15:34.118: W/AudioTrack(23005):
>> AUDIO_OUTPUT_FLAG_FAST denied by
>> >> client
>> >> 12-15 16:15:34.123: D/CsoundObj(23005): writing 4096 sample
>> blks of 32-bit
>> >> floats to dac
>> >>
>> >> You can see a larger log as well as references to the
>> description of the
>> >> system, and a link to the code that accepts or denies the
>> flag here:
>> >> https://docs.google.com/document/d/1g9-
>> M8NRrzRkiEVfNZOrQuULVbMKiSaytBJGQAtlCOIE/edit?usp=sharing>>
>> >> I'm wondering two thins about this:
>> >> (1) Is it problematic if the buffer sizes requested via -B
>> and -b command
>> >> line flags are different from the  buffer sizes above?
>> >> (2) Is the AUDIO_OUTOUT_FLAG_FAST denial very bad for latency or
>> >> inconsequential?
>> >>
>> >> By the way, my Nexus 7 2013 edition can update to Android 5,
>> if you have
>> >> access to one this will work.
>> >>
>> >>
>> >> Thanks for your time
>> >>
>> >>
>> >>
>> >> --
>> >> View this message in context:
>> http://csound.1045644.n5.nabble.com/Csound-in-Android-5-
>> tp5739058p5739274.html>> Sent from the Csound - Dev mailing list
>> archive at Nabble.com.
>> >>
>> >> --------------------------------------------------------------
>> ----------------
>> >> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
>> >> from Actuate! Instantly Supercharge Your Business Reports and
>> Dashboards>> with Interactivity, Sharing, Native Excel Exports,
>> App Integration & more
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>> corporations, FREE
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>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk>>
>> _______________________________________________
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>> >> https://lists.sourceforge.net/lists/listinfo/csound-devel
>> >
>> > ---------------------------------------------------------------
>> ---------------
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>>
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>>
>> -----------------------------------------------------------------
>> -------------
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>
> Dr Victor Lazzarini, Senior Lecturer, Dept. of Music,
> National University of Ireland, Maynooth
>
> ------------------------------------------------------------------------------
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Date2014-12-16 20:18
FromStephen Kyne
SubjectRe: [Cs-dev] Csound in Android 5
AttachmentsNone  None  
Out of interest, has anyone tried the new Android version (Lollipop)? 
It's supposed to be lower at least but I can't find any exact figures or details.

Stephen

> Date: Tue, 16 Dec 2014 14:45:18 -0500
> From: michael.gogins@gmail.com
> To: csound-devel@lists.sourceforge.net
> Subject: Re: [Cs-dev] Csound in Android 5
>
> Thanks for the information, I'll try your settings.
>
> Regards,
> Mike
>
> -----------------------------------------------------
> Michael Gogins
> Irreducible Productions
> http://michaelgogins.tumblr.com
> Michael dot Gogins at gmail dot com
>
>
> On Tue, Dec 16, 2014 at 1:15 PM, <Victor.Lazzarini@nuim.ie> wrote:
> > Very high ksmps. Here I can use ksmps=32, -b256 -B1024, on the Nexus &
> > Samsung tablets.
> > Latency is not great, better on the Nexus.
> >
> >
> >
> > ----- Original Message -----
> > From: Michael Gogins <michael.gogins@gmail.com>
> > Date: Tuesday, December 16, 2014 5:52 pm
> > Subject: Re: [Cs-dev] Csound in Android 5
> > To: Developer discussions <csound-devel@lists.sourceforge.net>
> >
> >> On Android 4.4 I use ksmps=960, -b1920, -B3840 --sample-accurate.
> >> Latency is bad, but performance is OK.
> >>
> >> Regards,
> >> Mike
> >>
> >> -----------------------------------------------------
> >> Michael Gogins
> >> Irreducible Productions
> >> http://michaelgogins.tumblr.com
> >> Michael dot Gogins at gmail dot com
> >>
> >>
> >> On Tue, Dec 16, 2014 at 9:53 AM, Victor Lazzarini
> >> <Victor.Lazzarini@nuim.ie> wrote:
> >> > What version of Android is this?
> >> >
> >> > I would think that -b can be lowered down to the ksmps value,
> >> but I am not sure whether that would help.
> >> >
> >> > I have to look at the flag you mentioned. I think this is
> >> defined by the hw. If the hw does not support it, then it can't
> >> be set.
> >> >
> >> > Victor Lazzarini
> >> > Dean of Arts, Celtic Studies, and Philosophy
> >> > Maynooth University
> >> > Ireland
> >> >
> >> >> On 15 Dec 2014, at 17:38, SimonKenny <digithree@gmail.com>
> >> wrote:>>
> >> >> Hi Victor
> >> >>
> >> >> Thank you for your reply.
> >> >>
> >> >> I can replicate your findings that anything less than 1024
> >> for the hardware
> >> >> buffer size (-B) gives sound problems. Also you are saying
> >> then that the
> >> >> software buffer size (-b) should be no less than 256? And
> >> should ksmps still
> >> >> be around 32 or 64?
> >> >>
> >> >> I've also noticed that the AUDIO_OUTOUT_FAST_FLAG is not
> >> being accepted by
> >> >> the AudioTrack library. Here's part of a log:
> >> >> 12-15 16:15:34.113: D/CsoundObj(23005): --Csound version 6.04
> >> (float>> samples) Dec 1 2014
> >> >> 12-15 16:15:34.113: D/CsoundObj(23005): graphics suppressed, ascii
> >> >> substituted
> >> >> 12-15 16:15:34.113: D/CsoundObj(23005): 0dBFS level = 1.0
> >> >> 12-15 16:15:34.114: D/CsoundObj(23005): orch now loaded
> >> >> 12-15 16:15:34.114: D/CsoundObj(23005): audio buffered in
> >> 2048 sample-frame
> >> >> blocks
> >> >> 12-15 16:15:34.114: W/libOpenSLES(23005): class OutputMix
> >> interface 0
> >> >> requested but unavailable MPH=43
> >> >> 12-15 16:15:34.118: W/AudioTrack(23005):
> >> AUDIO_OUTPUT_FLAG_FAST denied by
> >> >> client
> >> >> 12-15 16:15:34.123: D/CsoundObj(23005): writing 4096 sample
> >> blks of 32-bit
> >> >> floats to dac
> >> >>
> >> >> You can see a larger log as well as references to the
> >> description of the
> >> >> system, and a link to the code that accepts or denies the
> >> flag here:
> >> >> https://docs.google.com/document/d/1g9-
> >> M8NRrzRkiEVfNZOrQuULVbMKiSaytBJGQAtlCOIE/edit?usp=sharing>>
> >> >> I'm wondering two thins about this:
> >> >> (1) Is it problematic if the buffer sizes requested via -B
> >> and -b command
> >> >> line flags are different from the buffer sizes above?
> >> >> (2) Is the AUDIO_OUTOUT_FLAG_FAST denial very bad for latency or
> >> >> inconsequential?
> >> >>
> >> >> By the way, my Nexus 7 2013 edition can update to Android 5,
> >> if you have
> >> >> access to one this will work.
> >> >>
> >> >>
> >> >> Thanks for your time
> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> View this message in context:
> >> http://csound.1045644.n5.nabble.com/Csound-in-Android-5-
> >> tp5739058p5739274.html>> Sent from the Csound - Dev mailing list
> >> archive at Nabble.com.
> >> >>
> >> >> --------------------------------------------------------------
> >> ----------------
> >> >> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> >> >> from Actuate! Instantly Supercharge Your Business Reports and
> >> Dashboards>> with Interactivity, Sharing, Native Excel Exports,
> >> App Integration & more
> >> >> Get technology previously reserved for billion-dollar
> >> corporations, FREE
> >> >>
> >>
> >> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk>>
> >> _______________________________________________
> >> >> Csound-devel mailing list
> >> >> Csound-devel@lists.sourceforge.net
> >> >> https://lists.sourceforge.net/lists/listinfo/csound-devel
> >> >
> >> > ---------------------------------------------------------------
> >> ---------------
> >> > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> >> > from Actuate! Instantly Supercharge Your Business Reports and
> >> Dashboards> with Interactivity, Sharing, Native Excel Exports,
> >> App Integration & more
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> >> corporations, FREE
> >> >
> >>
> >> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk>
> >> _______________________________________________
> >> > Csound-devel mailing list
> >> > Csound-devel@lists.sourceforge.net
> >> > https://lists.sourceforge.net/lists/listinfo/csound-devel
> >>
> >> -----------------------------------------------------------------
> >> -------------
> >> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> >> from Actuate! Instantly Supercharge Your Business Reports and
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> >> Integration & more
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> >> corporations, FREE
> >>
> >> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk
> >> _______________________________________________
> >> Csound-devel mailing list
> >> Csound-devel@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/csound-devel
> >
> > Dr Victor Lazzarini, Senior Lecturer, Dept. of Music,
> > National University of Ireland, Maynooth
> >
> > ------------------------------------------------------------------------------
> > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
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> > _______________________________________________
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> > https://lists.sourceforge.net/lists/listinfo/csound-devel
> >
>
> ------------------------------------------------------------------------------
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Date2014-12-16 20:31
FromVictor.Lazzarini@nuim.ie
SubjectRe: [Cs-dev] Csound in Android 5
AttachmentsNone  None  None  None  

Date2014-12-16 22:05
FromSimonKenny
SubjectRe: [Cs-dev] Csound in Android 5
@Victor: I absolutely am shooting in the dark! I see your point, there's no
point to randomly testing it. Thanks for letting me know about the
/useAudioTrack/ flag, I thought it might be a magic fix...

I've read that there has been polling for preferred buffer sizes since
Android 17 (4.2) in this article from 2012:
http://www.music.columbia.edu/pipermail/andraudio/2012-November/000712.html

Quote: /Beginning with API level 17 (Android platform version 4.2), an
application can query for the native or optimal output sample rate and
buffer size for the device's primary output stream. When combined with the
feature test just mentioned, an app can now configure itself appropriately
for lower latency output on devices that claim support./

Also, FYI, if you use the *android.hardware.audio.low_latency*  demand in the Android manifest XML file, there are only 7 known and 8
unknown models of tablet which claim support for this! They are:

ASUS MeMO Pad FHD 10
ASUS Transformer Pad Infinity
Nexus 7
Nexus 9
Nexus 10
LG G Pad 8.3 Google Play Edition
AQUOS PAD SH-06F



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Date2014-12-17 17:07
FromVictor Lazzarini
SubjectRe: [Cs-dev] Csound in Android 5
The manifest feature does not seem to do anything. I also have tried the “optimal” settings
and they do not make any change. Touch to sound latency on 4.4, nexus 7 tablet is ~ 130ms

Regards
========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 16 Dec 2014, at 22:05, SimonKenny  wrote:
> 
> @Victor: I absolutely am shooting in the dark! I see your point, there's no
> point to randomly testing it. Thanks for letting me know about the
> /useAudioTrack/ flag, I thought it might be a magic fix...
> 
> I've read that there has been polling for preferred buffer sizes since
> Android 17 (4.2) in this article from 2012:
> http://www.music.columbia.edu/pipermail/andraudio/2012-November/000712.html
> 
> Quote: /Beginning with API level 17 (Android platform version 4.2), an
> application can query for the native or optimal output sample rate and
> buffer size for the device's primary output stream. When combined with the
> feature test just mentioned, an app can now configure itself appropriately
> for lower latency output on devices that claim support./
> 
> Also, FYI, if you use the *android.hardware.audio.low_latency*  ... /> demand in the Android manifest XML file, there are only 7 known and 8
> unknown models of tablet which claim support for this! They are:
> 
> ASUS MeMO Pad FHD 10
> ASUS Transformer Pad Infinity
> Nexus 7
> Nexus 9
> Nexus 10
> LG G Pad 8.3 Google Play Edition
> AQUOS PAD SH-06F
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Csound-in-Android-5-tp5739058p5739299.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
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Date2014-12-17 17:41
FromSimonKenny
SubjectRe: [Cs-dev] Csound in Android 5
The manifest feature is just a way of determining which devices are
compatible, it does not actually change the operation of the app. Also I
should say that that list of tablets also has several other feature requests
so is not a complete list of tablets that claim low latency support.

Good to know that I'm running at as close to as good as it gets for the
moment anyway.

So as I said earlier, if I can contribute to any development specifically
for Android I'd be very interested.

Thank you very much for your time.



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Date2014-12-17 18:03
FromVictor Lazzarini
SubjectRe: [Cs-dev] Csound in Android 5
If you want to contribute, you can install the devel tools for android (NDK, SDK), and go for it.
The C backend is in Android/CsoundAndroid/jni/rtopensl.c . There is a build.sh in CsoundAndroid
that can be used to build the C/C++ libs.

========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 17 Dec 2014, at 17:41, SimonKenny  wrote:
> 
> The manifest feature is just a way of determining which devices are
> compatible, it does not actually change the operation of the app. Also I
> should say that that list of tablets also has several other feature requests
> so is not a complete list of tablets that claim low latency support.
> 
> Good to know that I'm running at as close to as good as it gets for the
> moment anyway.
> 
> So as I said earlier, if I can contribute to any development specifically
> for Android I'd be very interested.
> 
> Thank you very much for your time.
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Csound-in-Android-5-tp5739058p5739318.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
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