i.mx6q android 2 x hdmi audio problem

[bingking88]

I have 2 hdmi output in android system, but the only way hdmi sound output,

ssi902x ---> mxc-spdif-0

mxc-hdmi -----> mxc-hdmi-soc-0

how to configure so that two hdmi has sound output.thanks!:smileyplain:

my hardware audio equipment

root@android:/ # alsa_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: imxspdif [imx-spdif], device 0: IMX SPDIF mxc-spdif-0 []

Subdevices: 1/1

Subdevice #0: subdevice #0

card 2: imxhdmisoc [imx-hdmi-soc], device 0: IMX HDMI TX mxc-hdmi-soc-0 []

Subdevices: 1/1

Subdevice #0: subdevice #0

[AlejandroSierra]

You need to register another imx-hdmi-soc-dai.

Take the HDMI 0 as a base.

This file arch/arm/plat-mxc/devices/platform-imx-hdmi-soc-dai.c registers HDMI-SOC-0.

[bingking88]

Dear Alejandro Sierra Guiza

    Thank you for your acvtive reply,In the default configuration ,spdif  audio has been configured in arch/arm/plat-mxc/devices/platform-imx-spdif-dai.c . my android patch r13.4 ,in android hal ,I add Support spdif audio ,but hmdi audio output only spdif audio,Could you tell me what should I do to make dual HDMI  output sound ? Thanks again

[juangutierrez · Accepted solution]

Hi

If what you are trying to do is to render the same audio trough both hdmi and spdif at same time. You can add something like this in your /system/etc/asound.conf

================ /system/etc/asound.conf ====================

pcm.both {        # change name "pcm.both" for pcm.!default to make it the default configuration

  type plug;

  slave.pcm {

      type multi;

      slaves.a.pcm "hw:0,0";   #in your case hw:1,0 for spdif (card1, dev 0)

      slaves.b.pcm "hw:2,0";   # hdmi card 2, dev 0

      slaves.a.channels 2;      # this is for stereo, you can set 4, 6, or 8 channels spdif

      slaves.b.channels 2;      # this is for stereo, you can set 4, 6, or 8 channels spdif

      bindings.0.slave a;         # binding channels to slave a, Add bindings if you add channels

      bindings.0.channel 0;

      bindings.1.slave a;

      bindings.1.channel 1;

      bindings.2.slave b;          # binding channels to slave a. Add bindings if you add channels

      bindings.2.channel 0;

      bindings.3.slave b;

      bindings.3.channel 1;

  }

  ttable.0.0 1;

  ttable.1.1 1;

  ttable.0.2 1;

  ttable.1.3 1;

}

=====================================================

The you can play audio with alsa like

aplay -Dboth file.wav   (I think in android is alsa_aplay)

If you replace the pcm.both name with pcm.!default then the command is just like

aplay file.wav

I tested this using cs42888 in card0 and hdmi as card2 and I was able to hear same audio in my headphones and in the hdmi monitor at same time. Also I did it in a Gnome FS, not Android but I guess should be similar.