Play audio throuhg HDMI on BeagleBone Black

[yol...@gmail.com]

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?

[yol...@gmail.com]

Adding new information about the issue:

'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 <pe...@perex.cz>

    license:       GPL

    description: Jack detection support for ALSA

    author:        Mark Brown <bro...@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)

[Robert Nelson]

On Tue, Mar 22, 2016 at 11:31 AM, <yol...@gmail.com> wrote:
> Adding new information about the issue:

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


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

Regards,

--
Robert Nelson
https://rcn-ee.com/

[Jason Kridner]

Only specific video modes of the HDMI framer device support audio. See the wiki page. 

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[yol...@gmail.com]

I have checked that the current resolution from BeagleBone's HDMI is: 1280x720@60e (/boot/uboot/uEnv.txt)

I'm working with "4.1.x" kernel modified to support all multitouch screens. 

So, if I update the kernel from ti branch, I suspect I lose the kernel's modifications to support the multitouch screens I'm working with. Is this right?

Is there any other way to support audio at this kernel? Maybe, if I replace the kernel for a newer one (ie. "4.5.x")?

[yol...@gmail.com]

Moreover, if I follow next steps:

cd /opt/scripts/tools/ 

git pull 

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

I get this message:

ERROR: The certificate of 'rcn-ee.com' is not trusted.

The certificate has not yet been activated. 

[Robert Nelson]

Update your bbb's clock:

we use "Let's Encrypt Authority X1" certificate, which has a narrow
time window: "3/16/16" -> "6/14/16"..

[yol...@gmail.com]

Thanks Robert!

I have an issue with ntp update at boot. I have solved it temporary.

Well, I have just tried to launch the 'update_kernel' script:

cd /opt/scripts/tools/ 

git pull 

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

But it fails due to there is not space left on device. 

cp: failed to extend '/boot/uboot/initrd.img': No space left on device

Checking device with 'df -h', output is:

/dev/mmcblk0p1     96M     96M     100%     /boot/uboot

Is there any option to extend this partition? Or maybe, can I remove some file from "/boot/uboot" without blocking the system? 

If '*_bak' folders are removed the result is the same, no space left neither, and at reboot, BBB is bricked.

[yol...@gmail.com]

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?

[yol...@gmail.com]

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.

[yol...@gmail.com]

Any hint/tip?

[yol...@gmail.com]

Going forward in my test:

- Current kernel: 4.1.18-ti-r56

- aplay -L:

null

 Discard all samples (playback) or generate zero samples (capture)

 default:CARD=Black

TI BeagleBone Black,

Default Audio Device

sysdefault:CARD=Black

TI BeagleBone Black,

Default Audio Device 

 

- speaker-test -D CARD=Black -t song.wav -c 2 -s 1

speaker-test 1.0.25

Playback device is CARD=Black

Stream parameters are 48000Hz, S16_LE, 2 channels

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM CARD=Black

Playback open error: -2,No such file or directory7

[yol...@gmail.com]

Launching alsaplayer, wav and mp3 files can be played, but no sound is reproduced.

It seems as the BeagleBone's drivers are not pointing to right audio interface.

How can I checked if the SoC's audio codec and the HDMI's interface are configured and working fine?

By the moment, I can't find a solution for the issue. I would be glad if someone could help me with it.

[Joe Julian]

On Tuesday, March 22, 2016 at 9:35:54 AM UTC-7, RobertCNelson wrote:

On Tue, Mar 22, 2016 at 11:31 AM,  <yol...@gmail.com> wrote:

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:

Do you  have a reference?

[Joe Julian]

As far as I can tell, based on https://github.com/archlinuxarm/PKGBUILDs/blob/master/core/linux-am33x/PKGBUILD, the Arch Linux kernel I'm using should have all the necessary patches to make this work with 4.5.2. Unfortunately it's not. aplay -l still shows no drivers.

@RobertCNelson do you see anything wrong with that patch set that might be a problem? I'd really prefer to use Arch since the package versions are new enough to support some of the features I'm trying to implement.

I do, of course, have the correct resolution and I confirmed the edid does have the audio block.

[Robert Nelson]

On Sun, Apr 24, 2016 at 2:52 PM, Joe Julian <j...@julianfamily.org> wrote:

As far as I can tell, based on https://github.com/archlinuxarm/PKGBUILDs/blob/master/core/linux-am33x/PKGBUILD, the Arch Linux kernel I'm using should have all the necessary patches to make this work with 4.5.2. Unfortunately it's not. aplay -l still shows no drivers.

That patchset doesn't include hdmi audio for the beaglebone black..

 

@RobertCNelson do you see anything wrong with that patch set that might be a problem? I'd really prefer to use Arch since the package versions are new enough to support some of the features I'm trying to implement.

Please see my previous statement, "NOTHING" has changed since then, and you can confirm that by looking at linux-next:

https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/arch/arm/boot/dts/am335x-boneblack.dts

Regards,

[Robert Nelson]

The last rfc was posted here:

https://www.spinics.net/lists/alsa-devel/msg48476.html

Regards,