gmane.comp.audio.portaudio.devel

Re: Linux Latency problem

Alexander Carôt — 2013-05-13T20:23:38

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Re: Compiling Portaudio for OSX 10.8.3

Olivier Tristan — 2013-05-13T15:33:04

This is not a portaudio specific question FWIW

make install
then add in the linker option
-L /usr/local/lib -lportaudio
should do the trick

Le 13/05/2013 17:30, Wouter Janmaat a écrit :

Re: Compiling Portaudio for OSX 10.8.3

Wouter Janmaat — 2013-05-13T15:30:52

Hey Oliver

got things in the right place now. 

I'm only having problems with the last step: when I search for libportaudio.a there is no such file on my system
How do I link the library to xcode?
On May 13, 2013, at 4:42 PM, Olivier Tristan <o.tristan< at >uvi.net> wrote:

Re: Compiling Portaudio for OSX 10.8.3

Wouter Janmaat — 2013-05-13T14:47:55

Yes I did but I didn't do the command line tools. I'm doing them right now!
On May 13, 2013, at 4:41 PM, Olivier Tristan <o.tristan< at >uvi.net> wrote:

Re: Compiling Portaudio for OSX 10.8.3

Olivier Tristan — 2013-05-13T14:42:16

Le 13/05/2013 16:41, Olivier Tristan a écrit :
If Yes, you need to install the command line Tools in Xcode preferences 
as well.

Re: Compiling Portaudio for OSX 10.8.3

Olivier Tristan — 2013-05-13T14:41:12

Le 13/05/2013 16:39, Wouter Janmaat a écrit :

You have installed Xcode right ?

Compiling Portaudio for OSX 10.8.3

Wouter Janmaat — 2013-05-13T14:39:02

Hi All,

it's my first time using PortAudio and I'm currently trying to compile for OSX 10.8.3 using the ./config && make commands from the tutorial but I keep getting errors. They look like this:

checking build system type... i386-apple-darwin12.3.0
checking host system type... i386-apple-darwin12.3.0
checking target system type... i386-apple-darwin12.3.0
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/Users/wouterjanmaat/Downloads/portaudio':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details


I tried using the disable universal binaries flag but that didn't help.I tried both the latest nightly build and the latest stable build.

Please help me out

Thanks

Wouter

Re: Linux Latency problem

Ross Bencina — 2013-05-13T13:52:55

Hi Alex,

 From that timing trace it looks to me like the 128 sample case is still 
using a 256 frame host buffer size (fragment size). You could try 
playing with the suggested latency parameter (eg. set it lower) and see 
if that helps. If you set the suggested latency very low then you should 
be able to get it to use framesPerBuffer as the host buffer size.

Ross.


On 13/05/2013 5:45 PM, "Alexander Carôt" wrote:

Re: Linux Latency problem

Bjorn Roche — 2013-05-13T13:27:53

Enable realtime scheduling is described here:

http://portaudio.com/docs/v19-doxydocs/compile_linux.html

bjorn

On May 13, 2013, at 3:45 AM, Alexander Carôt wrote:


-----------------------------
Bjorn Roche
http://www.xonami.com
Audio Collaboration
http://blog.bjornroche.com
< at >xonamiaudio

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Linux Latency problem

Alexander Carôt — 2013-05-13T07:45:10

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Re: Portaudio and Remote Desktop Sessions

Tim Neumann — 2013-05-10T18:32:34

" the audio is very broken up in both directions. "
What does that mean?
Could be the high compression used in VNC/RDC protocols.


2013/5/10 Geordi Sinclair <geordi.sinclair< at >telxl.com>

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Portaudio and Remote Desktop Sessions

Geordi Sinclair — 2013-05-10T17:18:57

Hello,

I am using the latest version of Portaudio, from svn.  It is built into iaxclient.dll.  It works very well on Windows XP and Windows 7 , but I have having odd issues with the audio when using Remote Desktop Connection (from windows 7 64 bit) to a remote desktop session (Windows 2008 Server).  I allow the microphone and speaker of windows 7 to be available over the RDC.  I can see them on the RDS, as "Remote Audio", but when I use them, the audio is very broken up in both directions.

If I check the audio from the local mic to the RDS, via an audio recorder, the quality is fine.

Any ideas?

Thanks

Geordi
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Re: Buffer alignment requirement of various audio format

Ross Bencina — 2013-05-07T07:53:49

Hello Pradeep,

The only alignment requirement would be for the individual samples (not 
frames). So for paInt16 (16 *bit*) the alignment would be 2 bytes (not 
16). Similarly for paFloat32 (32 *bit*) the alignment would be 4 bytes.

PA doesn't require more alignment than that.

In principle there are some arguments for 16-byte alignment to better 
support SSE based conversion funcitons. But we don't require or directly 
support this.

Your system allocator will most likely provide at least 4-byte alignment 
guaranteed. You can check the documentation for your runtime libraries 
for details.

try googling for "malloc alignment guarantee" and similar.

Ross.



On 7/05/2013 5:42 PM, Pradeep Kumar wrote:

Buffer alignment requirement of various audio format

Pradeep Kumar — 2013-05-07T07:42:32

Hi All,

I've some question on requirement of alignment of data buffer used by
Pa_WriteStream or Pa_Callback.
I want to support for two audio format paInt16 and paFloat32.
So do I've to align my data buffer on 32byte boundary for paFloat32 and
16byte boundary of paInt16?

Also if I use Pa_RingBuffer in my application do I ever need to worry about
alignment or ring buffer internally take care of alignment?

Please share some thoughts.

Regards,
Pradeep
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Re: Noise when writing silence in pa_callback

Ross Bencina — 2013-05-07T04:39:02

Hi Pradeep,

Just a note: you can use Pa_GetSampleSize() to convert the PA sample 
format into the number of bytes:

http://portaudio.com/docs/v19-doxydocs/portaudio_8h.html#a541ed0b734df2631bc4c229acf92abc1

E.g. when you create the stream and initialize the PaStreamParameters:

PaStreamParameters p;
...
p.sampleFormat = paFloat32 or paInt16;
...

sample_fmt_byte = Pa_GetSampleSize(p.sampleFormat);
Pa_OpenStream...

Maybe that makes your code slightly cleaner.

Ross


On 6/05/2013 8:27 PM, Pradeep Kumar wrote:

Re: Pa_Initialize crash

Sergio Teran — 2013-05-06T19:00:49

Thanks Phil, yeah I realized that after. Well actually ended up just
removing everything and re-installing and it doesn't crash now.
Yes I was on Windows and compiled the library myself using minGW. Guess
something got corrupted somewhere.
Just having some issues with the recording of audio but still need to
figure some things out.

Thanks for your help.


On Mon, May 6, 2013 at 5:39 PM, Phil Burk <philburk< at >mobileer.com> wrote:

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Re: Pa_Initialize crash

Phil Burk — 2013-05-06T15:39:45

Hello Sergio,

 >  if(err  !=  paNoError){
 >     qDebug()  <<  "Pa_Initialize passed  ...  ";

I think you want == instead of != to detect the passed condition. The 
pnNoError return value means there was "no error".

Phil Burk

On 5/6/13 3:32 AM, Sergio Teran wrote:

Re: Pa_Initialize crash

Tim Neumann — 2013-05-06T12:37:03

From that path I assume that you use Windows, right?

Did you build your portaudio library yourself?
Is your portaudio .dll inside the folder where your PaTest_record.exe is?
Is there any other place where a version (probably an older one) of
portaudio could be? is that
place in your PATH environment variable?

What I guess is that when executing, your program is loading the wrong
library.


2013/5/6 Sergio Teran <sergio.a.teran< at >gmail.com>

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Pa_Initialize crash

Sergio Teran — 2013-05-06T10:32:43

Hello,

I am trying to use portaudio in my Qt desktop app to use the audio
IO functionality  but I am not being able to initialize the library.

My project will build fine but as soon as I execute it it will crash
automatically if I have the Pa_Initialize() call in it. If I comment it out
it continues with no problem.

I did a whole new blank project and I only have this in it:

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

{

    // Test UI with just one button

     button = new QPushButton(tr("OKK"), this);

    connect(button, SIGNAL(clicked()), this, SLOT(close()));


    PaError err;

    err = Pa_Initialize();


    if(err != paNoError){

        qDebug() << "Pa_Initialize passed ... ";

        return;

    }

    else

        qDebug() << "THERE WAS AN ERROR";

}


can anyone help me out to what could be the problem?

The error I get when the program stops is:


The program has unexpectedly finished.

C:\Qt\dev\Projects\build-PaTest_record-Desktop_Qt_5_0_2_MinGW_32bit-Debug\deb

Re: Noise when writing silence in pa_callback

Pradeep Kumar — 2013-05-06T10:27:09

*Thank you all for the help.*
*
*
*The issue is resolved. I'm getting clear silence without any noise.*
*Since I had to support multiple formats *
*
*
*I used*

*memset(out, 0, framelen*sample_fmt_byte*numChannels);*

*where sample_fmt_byte: sizeof(uint16_t) or sizeof(float) depending
upon sample format.*

*Best Regards,*

*Pradeep*

On 3/05/2013 9:08 AM, Ross Bencina wrote:
And *numChannels assumes that the buffer is interleaved.

Ross.
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Re: Noise when writing silence in pa_callback

Ross Bencina — 2013-05-02T23:17:16


On 3/05/2013 9:08 AM, Ross Bencina wrote:

And *numChannels assumes that the buffer is interleaved.

Ross.