On Wed, Mar 18, 2015 at 1:46 AM, Vijay Galbaransingh <vij...@sfu.ca> wrote:
> Tom,
>
> What kind of sample rate / setup are you using for your opensl_source? I've
> set up a flowgraph that is just an opensl_source (sampling at 48kHz)
> connected to a file sink, and when I play back the file through GRC on my
> desktop my audio is coming out pretty garbled, as if samples are being
> dropped. I've also tried a couple other sampling rates (44.1kHz, 32kHz,
> 16kHz to name a few.) I'm using a Nexus 4 running Android 5.0.1. Pasted
> below is some of my code.
>
> Vijay
>
> Flowgraph code:
> JNIEXPORT void JNICALL
> Java_com_example_grrecordmic_GrRecordMic_InitFlowgraph(JNIEnv* env, jobject
> thiz, jstring jsinkfilename)
> {
> int rate = 48000;
> const char *sinkfilename = env->GetStringUTFChars(jsinkfilename, 0);
>
> global_tb = gr::make_top_block("Record_Mic");
>
> gr::grand::opensl_source::sptr micSource =
> gr::grand::opensl_source::make(rate);
> gr::blocks::file_sink::sptr fileSink =
> gr::blocks::file_sink::make(sizeof(float), sinkfilename, false);
>
> global_tb->connect(micSource, 0, fileSink, 0);
>
> env->ReleaseStringUTFChars(jsinkfilename, sinkfilename);
> }
>
I believe that I used either 32k and/or 44.1k. I was using a Nexus 7,
though, and the codec might play a significant role with this between the
two devices.
Perhaps try setting the file sink to unbuffered mode?
fileSink->set_unbuffered(true);
Frankly, I feel like this is unlikely to help, but it'll be interesting to
know what happens.
Tom
> From: trond...@trondeau.com [mailto:trond...@trondeau.com] On Behalf Of
> Tom
> Rondeau
> Sent: March-17-15 07:37
> To: Vijay Galbaransingh
> Cc: GNURadio Discussion List
> Subject: Re: [Discuss-gnuradio] GNU Radio on Android
>
> On Tue, Mar 17, 2015 at 12:10 AM, Vijay Galbaransingh <vij...@sfu.ca>
> wrote:
> Thanks Tom, that sorted it out. My audio output is a bit choppy but no
> matter – time to move on to some more complex flowgraphs in my Android app.
>
> Thanks again,
> Vijay
>
> Yes, the skipping in the audio output is a known bug, and apparently known
> to be difficult in Android. It's going to take some kind of double
> buffering
> to fix it at this level. I did not experience any problems with the audio
> source, though; I just saved it to a file, brought it back to my computer,
> and played it there and it sounded fine.
>
> Tom
>
>
>
> From: trond...@trondeau.com [mailto:trond...@trondeau.com] On Behalf Of
> Tom
> Rondeau
> Sent: March-16-15 06:37
> To: Vijay Galbaransingh
> Cc: GNURadio Discussion List
> Subject: Re: [Discuss-gnuradio] GNU Radio on Android
>
> On Mon, Mar 16, 2015 at 3:28 AM, Vijay Galbaransingh <vij...@sfu.ca>
> wrote:
> Hi Tom,
>
> I have been following your notes on the wiki in an attempt to build a test
> app (a dial tone flowgraph.) I'm hitting a snag on the ndk-build step
> though -- when I use your example Android.mk listing, the linker isn't
> finding any of the static libraries we built (gnuradio, grand, boost,
> fftw.)
> Instead I'm getting a pile of undefined reference errors.
>
> I tried editing the example Android.mk file by adding the following before
> the shared library build:
>
> include $(CLEAR_VARS)
> LOCAL_MODULE := grand_static_lib #for example
> LOCAL_SRC_FILES := /opt/grandroid/lib/libgnuradio-grand.a
> include $(PREBUILT_STATIC_LIBRARY)
>
> However I quickly realised that while there are only a few gnuradio
> libraries to add this way, there are a ton of boost libraries... Is there a
> smarter way to add all the prebuilt .a libraries at once? Or am I headed in
> the wrong direction entirely?
>
> Any tips appreciated,
> Vijay
>
>
> Yep, you have to add all of the libraries into the Android.mk file. I've
> updated the wiki:
>
> http://gnuradio.org/redmine/projects/gnuradio/wiki/GRAndApps
>
> You can go there and simply download GrAndroid.mk that does all of this for
> you and include it in your Android.mk file. Just follow the instructions.
>
> Hope that helps,
>
> Tom
>
>
>
> From: trond...@trondeau.com [mailto:trond...@trondeau.com] On Behalf Of
> Tom
> Rondeau
> Sent: March-13-15 14:41
> To: Vijay Galbaransingh
> Cc: GNURadio Discussion List
> Subject: Re: [Discuss-gnuradio] GNU Radio on Android
> On Fri, Mar 13, 2015 at 5:04 PM, Vijay Galbaransingh <vij...@sfu.ca>
> wrote:
> Hi,
>
> Has a patched version of GNU Radio which runs on Android been released?
>
> I'm working on a project where I'm transmitting information over audio
> from a desktop system to an Android device, and since setting up the
> transmitter end with GNU Radio was such a snap I would love to leverage
> the GNU Radio system to build the receiver as well.
>
> Thanks,
> Vijay
>
> Just yesterday, in fact:
>
> http://gnuradio.org/redmine/projects/gnuradio/wiki/Android
>
> I'll try to release some of my apps soon. One of them captures from the
> audio device, even. It's not too hard since there's the gr-grand opensl
> audio source block to talk to the audio system.
>
> Tom
>
>
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