Play audio through HDMI on BeagleBone Black

After work with a multitouch screen for the BeagleBone Black, now I just want to play audio/sounds through the HDMI connection as the multitouch screen has a speaker.

First of all, I just copied an audio sample, and try to reproduce it by 'vlc', but next message is shown:

"Audio output failed. The audio device "default" could not be used. No such file or directory."

Then, I have installed next tools:

'alsa-base', 'alsa-utils', 'alsa-tools', 'alsamixergui'

But, when I tried to launch 'alsamixergui', the next message is shown:

"alsamixer: function snd_ctl_open failed for default: No such file or directory"

And at "/etc/modprobe.d/alsa-base.conf", the content is:

# autoloader aliases

install sound-slot-0 /sbin/modprobe snd-card-0

install sound-slot-1 /sbin/modprobe snd-card-1

install sound-slot-2 /sbin/modprobe snd-card-2

install sound-slot-3 /sbin/modprobe snd-card-3

install sound-slot-4 /sbin/modprobe snd-card-4

install sound-slot-5 /sbin/modprobe snd-card-5

install sound-slot-6 /sbin/modprobe snd-card-6

install sound-slot-7 /sbin/modprobe snd-card-7

# Cause optional modules to be loaded above generic modules

install snd /sbin/modprobe --ignore-install snd && { /sbin/modprobe --quiet snd-ioctl32 ; /sbin/modprobe --quiet snd-seq ; : ; }

install snd-rawmidi /sbin/modprobe --ignore-install snd-rawmidi && { /sbin/modprobe --quiet snd-seq-midi ; : ; }

install snd-emu10k1 /sbin/modprobe --ignore-install snd-emu10k1 && { /sbin/modprobe --quiet snd-emu10k1-synth ; : ; }

# Keep snd-pcsp from beeing loaded as first soundcard

options snd-pcsp index=-2

# Keep snd-usb-audio from beeing loaded as first soundcard

options snd-usb-audio index=-2

# Prevent abnormal drivers from grabbing index 0

options bt87x index=-2

options cx88_alsa index=-2

options snd-atiixp-modem index=-2

options snd-intel8x0m index=-2

options snd-via82xx-modem index=-2

Moreover, I have try with next commands:

'alsamixer -c 1 (2, 3... 7)'

Having next output:

"invalid card index: 1"

Is there any way to reproduce any sound (*.midi, *.wav, *.mp3...) through hdmi easily?

______________ EDIT ______________

'lsmod':

snd 56846 6 snd_soc_core, snd_timer, snd_pcm, snd_seq, snd_seq_device, snd_comp

'modinfo snd':

filename: /lib/modules/4.1.16-bone18/kernel/sound/core/snd.kp

alias: char-major-116-*

license: GPL

description: Advanced Linux Sound Architecture driver for soundcards.

author: Jaroslav Kysela <perex@perex.cz>

license: GPL

description: Jack detection support for ALSA

author: Mark Brown <broonie@opensource.wolfsonmicro.com>

depends: soundcore

intree: Y

vermagic: 4.1.16-bone18 mod_unload modversions ARMv7 thumb2 p2v8

parm: slots:Module names assigned to the slots. (array of charp)

parm: major:Major # for sound driver. (int)

parm: cards_limit:Count of auto-loadable soundcards. (int)

______________ EDIT2 ______________

HDMI audio is in patch hell on mainline, if you want to use "4.1.x"

with hdmi audio you need to use the ti branch:

cd /opt/scripts/tools/

git pull

sudo ./update_kernel.sh --ti-channel --lts-4_1

Kernel is updated to TI's branch: "4.1.15-ti-r40".

Now, VLC player does not show any error message and plays the sound sample, but no sound is reproduced.

I have checked the basics, volume, mute option and similar. These are not the failures.

Which could the missing part for making the sound audible? Maybe codecs?

Testing the sound configuration, next instructions are launched:

ls /dev/snd

ls /proc/asound

cat /proc/asound/cards
cat /proc(asound/devices
aplay -l
cat /proc/asound/card0/pcm0p/sub0/hw_params

With output:

Black card0 cards devices oss pcm seq timers version
0 [Black          ]: TI_BeagleBone_B - TI BeagleBone Black
                      TI BeagleBone Black
2: [ 0]   : control
3: [ 0- 0]: digital audio playback
4: [ 0- 0]: digital audio capture
33:        : timer
**** List of PLAYBACK Hardware Devices ****
card 0: Black [TI BeagleBone Black], device 0: HDMI hdmi-hifi-0 []
Subdevices: 0/1
Subdevice #0: subdevice #0
access: MMAP_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 32000 (32000/1)
period_size: 1024
buffer_size: 16384

But there is no sound.

Any hint/tip?