Transmitting ac3 content via spdif

Transmitting ac3 content via spdif

[Fabio Estevam]

Hi,

I am trying to transmit ac3 content via spdif on a mx6 (on a yet
non-mainlined driver).

Tried to force non-audio mode via iecset:

# iecset audio 0
control "IEC958 Playback Default" (index -1) not found

root@imx6qsabrelite:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sgtl5000audio [sgtl5000-audio], device 0: HiFi sgtl5000-0 []
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 1: imxhdmisoc [imx-hdmi-soc], device 0: IMX HDMI TX mxc-hdmi-soc-0 []
   Subdevices: 1/1
   Subdevice #0: subdevice #0

Transmitting a wav file works fine though.

Any suggestions as to how provide the "IEC958 Playback Default" control?

Thanks,

Fabio Estevam

Re: Transmitting ac3 content via spdif

[Fabio Estevam]

On Fri, Oct 26, 2012 at 5:30 PM, Fabio Estevam <festevam@gmail.com> wrote:
> Hi,
>
> I am trying to transmit ac3 content via spdif on a mx6 (on a yet
> non-mainlined driver).
>
> Tried to force non-audio mode via iecset:
>
> # iecset audio 0
> control "IEC958 Playback Default" (index -1) not found

Ok, need to pass "-c 1" option to iecset:

$ iecset -c 1 audio 0
Mode: consumer
Data: non-audio
Rate: 44100 Hz
Copyright: permitted
Emphasis: none
Category: general
Original: 1st generation
Clock: 1000 ppm
root@imx6qsabrelite:/home# aplay -D hw:1,0 -f dat /home/mcxpk_audio_capture.ac3
Playing raw data '/home/mcxpk_audio_capture.ac3' : Signed 16 bit
Little Endian, Rate 48000 Hz, Stereo

Thanks,

Fabio Estevam

Re: Transmitting ac3 content via spdif

[Fabio Estevam]

On Fri, Oct 26, 2012 at 7:50 PM, Fabio Estevam <festevam@gmail.com> wrote:
> On Fri, Oct 26, 2012 at 5:30 PM, Fabio Estevam <festevam@gmail.com> wrote:
>> Hi,
>>
>> I am trying to transmit ac3 content via spdif on a mx6 (on a yet
>> non-mainlined driver).
>>
>> Tried to force non-audio mode via iecset:
>>
>> # iecset audio 0
>> control "IEC958 Playback Default" (index -1) not found
>
> Ok, need to pass "-c 1" option to iecset:
>
> $ iecset -c 1 audio 0
> Mode: consumer
> Data: non-audio
> Rate: 44100 Hz
> Copyright: permitted
> Emphasis: none
> Category: general
> Original: 1st generation
> Clock: 1000 ppm
> root@imx6qsabrelite:/home# aplay -D hw:1,0 -f dat /home/mcxpk_audio_capture.ac3
> Playing raw data '/home/mcxpk_audio_capture.ac3' : Signed 16 bit
> Little Endian, Rate 48000 Hz, Stereo

Just to close this issue, in case someone else wants to do the same thing.

Managed to stream AC3 via HDMI using ac3dec tool:

ac3dec -D hw:1,0 -C test.ac3

Regards,

Fabio Estevam