2017-08-29 3:49 GMT+05:00 Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>: > HDMI passthrough needs some love. What works with ALSA is plain > broken with PulseAudio (no audio or random noise). Only the AC3 > format seems to work, EAC3 is broken and HBR formats are not > supported yet. > > Fix EAC3 issues where the AES non-audio bit is not set when opening > the alsa-sink. The fix is to force a suspend/resume when an actual > sink-input is connected. This is far from optimal since we suspend/resume > twice (once for rate, once on entering passthrough) but the state > machine is obviously quite racy. > > Add definitions for Dolby TrueHD and DTSHD. This needs additional > work since ALSA will only enable the HBR passthrough mode with > 8 channels and 192kHz. For now the ALSA sinks are only configured to > support 2 channels for passthrough and we'd need to switch between 2 > and 8 channels depending on the format. I don't quite understand how > the profiles are managed and could use some help here. Your work invalidates the comment added in this commit: https://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=04737989ec537e01d63c155807a5d19b0ec5b294 I think that, if you don't undo this commit, at least a better message what exactly works is needed. I.e. how to test, given that the HDMI sink does not have the formats set. -- Alexander E. Patrakov
