tiomap-dev team mailing list archive

[Mans Rullgard <mans.rullgard@xxxxxxxxxx>]

I presume your optical link is S/PDIF, which supports only two channels
of PCM, so unless the audio is being compressed (e.g. as Dolby Digital)
on the fly, the sender (in this case the TV) must downmix to stereo or
simply drop the extra channels.  I wouldn't be very surprised if the TV
is simply dropping the high channels.  I would have tested this using an
amp with HDMI input.

-- 
You received this bug notification because you are a member of TI OMAP
Developers, which is subscribed to linaro-landing-team-ti.
https://bugs.launchpad.net/bugs/919378

Title:
  Panda: hdmi audio only on 2 channels

Status in Linaro Texas Instruments Landing Team:
  Won't Fix
Status in Linaro Multimedia WG project:
  Won't Fix
Status in Linaro Ubuntu Evaluation Builds:
  Confirmed

Bug description:
  Installed the linarotv image 20120114-2 and hwpack_linaro-lt-panda-x11-base_20120106-1 on a Pandaboard ES with linaro-media-create.
  After boot installed ubuntu-omap4-extras-multimedia.

  HDMI connected to a Yamaha RX-V1800 audio-video-receiver and from
  there to a 1080p plasma.

  Verified multichannel audio with xbmc.

  xbmc settings:

  Audio output: HDMI
  Speaker Configuration: 5.1
  Audio output device: Defaults (ALSA)
  Passthrough output devive: hdmi (ALSA)

  1. when passthrough is enabled AC3 sound in videos does not work

  2. when passthrough is disabled only 2 audio channels are transmitted
  to the AVR (AVR display has indicators showing which channels are in
  use)

  Crosschecked with alsa speaker-test (speaker-test -c6 -t wav) with
  same result:

  Output correct for front left, front right and center (the latter only
  because the pro-logic decoder in the AVR puts sound equal to left and
  right onto the center) but rear sound is played with low volume on the
  front speakers.

  Situation remains after update/dist-upgrade on Jan 21. 20:45CET.

  Attaching the EDID sent by the AVR in case the audio capabilities are
  used by the driver (EDID is recorded with SwitchResX on a MacBook).

To manage notifications about this bug go to:
https://bugs.launchpad.net/linaro-landing-team-ti/+bug/919378/+subscriptions