On Thu, Mar 19, 2015 at 3:28 AM, Vijay Galbaransingh <vij...@sfu.ca> wrote:
> Tom, > > As you expected, disabling buffering on the file sink did not have any > effect. I have fixed the issue though by making two changes to > opensl_source_impl.cc: > 1) change scale_factor to 32768 (1/2^14 doesn't make sense, it causes > clipping because the volk conversion method divides by scale_factor.) > 2) change buffer size (d_size) to 8k (2k was too small, tested > 32/44.1/48kHz > on Nexus 4 and Nexus 7 2012 version.) Without this change the recorded > audio > will be very choppy (dropped samples?) > > Vijay Ah, ok, that makes sense. I think I was just playing around with those parameters and must have checked them in at that state. I'll make those updates to the repo. Thanks. Tom > > From: trond...@trondeau.com [mailto:trond...@trondeau.com] On Behalf Of > Tom > Rondeau > Sent: March-18-15 07:11 > To: Vijay Galbaransingh > Cc: GNURadio Discussion List > Subject: Re: [Discuss-gnuradio] GNU Radio on Android > > 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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