I have been attempting to implement a sound record / playback application
on a Rev C BeagleBone Black using the latest BBBAndroid image.
I have run into a brick wall. I am a self-confessed Android newbie, so any
ideas/pointers from 'ye experts would be much appreciated.
To date, I have:
- Verified that the hardware is good by taking Android out of the equation.
(I verified audio playback/record to/from a USB headset, using the Gnome
media sound recorder on the latest BeagleBoard Debian installation).
- Verified that BBBAndroid recognizes the USB device (I see it in the log;
also I have found that when I click on the headset's volume control, the
Android's volume slider is displayed)
- Written a couple of USBAudio demo applications that can record and
playback an mp4, or wav file.
(These have been failures - I have tried different implementations using
the MediaPlayer, MediaRecorder and AudioRecord classes ... read on).
What I have found:
a) The audio playback app generates no sound, either to the HDMI monitor,
or a USB headset.
(actually, the BBB is completely mute, no notification sounds, no sound
playback ... it is quiet as a mouse).
b) The sound recorder app does create a wav, or mp4 file, but the file just
contains rubbish.
I think that there could be something mis-configured in the Android build,
but I can't put my finger on it. For grins, I did set up the build
environment and tried setting BOARD_USES_GENERIC_AUDIO to true in the
BoardConfig.mk file, but it made no difference ... of course :-)
Has anyone managed to get USB Audio to work on BBBAndroid?
Thanks in advance,
Graham
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