On Tue, Jan 19, 2016 at 02:47:50PM +0100, Lars-Peter Clausen wrote: > On 01/12/2016 04:38 PM, Philipp Zabel wrote: > > Exporting the ELD bytes to userspace allows an application to select > > an appropriate audio format depending on the current capabilities of > > the connected HDMI sink device. > > This needs an explanation why this method, which will require explicit > support in applications, should be used rather than the standard ALSA > hardware capabilities reporting. That can be summed up in one line: ALSA doesn't know about all the different formats for compressed audio. As far as I'm aware, applications today just lie to ALSA and use the "16-bit PCM audio" formats (SNDRV_PCM_FORMAT_S16_LE or SNDRV_PCM_FORMAT_U16_LE) to send compressed audio via ALSA, relying on the IEC controls to set the channel status data correctly. Maybe it would be nice to add formats for DTS, DTS-HD, AC3, OBA, etc to the ALSA format list. -- RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
