On Tue, Jan 5, 2010 at 8:59 PM, Jamie Lokier <jamie@xxxxxxxxxxxxx> wrote: > James Shatto wrote: >> On Tue, 5 Jan 2010 01:07:21 +0300 >> An St <vit.b12@xxxxxxxxx> wrote: >> >> > Hello! >> > >> > Please help. I can't get working microphone at HDMI output. >> >> HDMI audio normally has some sort of limit in place. For my ATI >> HD4550 video card, the audio has to be transmitted in an AC3 codec(5.1 >> surround). AKA compressed, it will not work with PCM audio which >> might be where your making a connection is giving you trouble. That >> capability might depend on your graphics card, but that's the quirk of >> mine. Assuming that your HDMI audio is provided via a graphics card. >> >> Maybe alsa can handle the AC3 conversion transparently / internally, >> or NOT. It's seems a bit destined for problems IMO, so I just avoid >> the issue with an RCA cable from a dedicated soundcard. Fortunately >> my HDTV has a channel with HDMI/DVI input and RCA audio input so >> running that machine on a 42" display is possible. >> >> If my graphics card does handle PCM audio over HDMI, it's probably >> limited to 2 channels, 48kHz, 16 bit, and all that jazz. Maybe even >> 44.1kHz. I really haven't checked the specs that recently on it. >> But I only have one receiving device for HDMI audio (HDTV) so it's >> not a priority to explore for me. Which is kind of ironic since the >> audio device registers and an hda-intel device. AKA high definition >> audio. But the limits are listed in the manual. Not that I've >> looked at it in the past year+. > > Normally it is the HDMI receiving device (i.e. the TV/monitor) which > determines which audio formats can be sent, and you should be able to > send any of the major standard compressed formats if the receiving > device accepts them. > > The EDID data, read from the TV/monitor over DDC, tells the sender > (i.e. graphics card + drivers + X + apps) what formats it accepts. > > It is very similar to the way EDID tells the sender what video formats > it accepts. > > -- Jamie > There is audio at LCD TV from any ALSA-programs, but not from microphone. I think it does not a audio format problem. Also, I can hear microphone only at anolog output. Problem is in forwarding microphone signal to HDMI. ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
