Hello,
I'm using the example audio applications in the TI EZSDK to capture & playback audio using a TI8168 processor. I've followed the steps mentioned in:
http://processors.wiki.ti.com/index.php/DM81xx_AM38xx_Audio_Driver_User_Guide#Opening_the_audio_device
and the HDMI user guide:
http://processors.wiki.ti.com/index.php/TI81XX_HDMI_User_Guide#HDMI_Auto_Mode_Configuration
I installed all the modules & enabled all the audio devices. I'm using HDMI to first playback & then capture audio signal. Here's what I'm observing:
root@arago:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: EVM [TI81XX EVM], device 0: AIC3X tlv320aic3x-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: EVM [TI81XX EVM], device 1: hdmi HDMI-DAI-CODEC-1 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: EVM [TI81XX EVM], device 2: ADV7604 adv7604-hifi-2 []
Subdevices: 1/1
Subdevice #0: subdevice #0
root@arago:~# arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: EVM [TI81XX EVM], device 0: AIC3X tlv320aic3x-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: EVM [TI81XX EVM], device 1: hdmi HDMI-DAI-CODEC-1 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: EVM [TI81XX EVM], device 2: ADV7604 adv7604-hifi-2 []
Subdevices: 1/1
Subdevice #0: subdevice #0
Using the HDMI playback device & a sample audio stream:
root@arago:~# aplay -Dhw:0,1 dt_32bars_89rap.wav
Playing WAVE 'dtWrapper Enabled...
_32bars_89rap.waStart audio transfer...
v' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Aborted by signaWrapper disabled...
l Interrupt...
root@arago:~#
If I use the capture signal:
root@arago:~# arecord -d 60 -f cd -t wav -c 2 -Dhw:0 sample_capture_3.wav
Recording WAVE 'sample_capture_3.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
overrun!!! (at least 1059.871 ms long)
And play it back, I hear nothing (but some noise maybe!). The file is not empty & it has definitely captured something (#cat sample_capture_3.wav - gives non-zero values)
root@arago:~# aplay -Dhw:0,1 sample_capture_3.wav
Playing WAVE 'saWrapper Enabled...
mple_capture_3.wStart audio transfer...
av' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Wrapper disabled...
root@arago:~#
If I use the capture example provided in the first link mentioned above, I get this output:
root@arago:~# ./minimal_capture
snd_pcm_readi successful
root@arago:~#
I am wondering if there's anything else to do to capture audio using HDMI or if there's any step I'm missing. I think that I've included all the HDMI audio modules but I still don't see any capture happening. Do you have any ideas or is there a bug in the processor of some sort that I'm unaware of? Thanks,
Bharadwaj
