>>>>>> I'm trying to get multichannel sound working on my nvidia nforce 590 >>>>>> based mobo that uses the intel hd audio (nvidia mcp55) chipset. It >>>>>> plays fine in two channels but any attempts to use -Dsurround51 or >>>>>> -Dsurround40 fail. Ie: >>>>>> >>>>>> Playing WAVE 'space_battle.wav' : Signed 16 bit Little Endian, Rate >>>>>> 44100 Hz, Channels 6 >>>>>> aplay: set_params:906: Channels count non available >>>>> That's correct. Use -Dplug:surround40, because the count of channels from >>>>> the .wav file has to be converted to four. >>>> I just upgraded to 1.0.12_rc2, and I've got a lot more mixer controls in >>>> alsamixer now. I can see front, rear, surround, etc. And now I can >>>> finally specify -Dplug:surround71 to get 8 channel audio! >>>> >>>> However, there is one problem. On my card the channels are not exactly >>>> correct when running speaker-test. The side and rear speakers are >>>> reversed. I double checked this with my card's manual, and in Windows. >>> Does -Dplug:surround51 work as expected? >> speaker-test hangs when I use plug:surround51, however since upgrading I >> incorrectly said that mplayer hangs when playing multichannel audio. >> When playing a 6 channel audio file with mplayer (it says it uses >> surround51) it also has the rear and side channels reversed. Obviously >> since it's 6 channel audio the side channels are not used, but the rear >> channels come out of the side speakers. > > OK, then it's either a bug of BIOS or a specification of HD-audio. > A tentative patch is below. Thanks the patch! I applied it, and channel output now works as expected! Must be irritating having to cope with all the different hardware variations / flaws! >>>> Also, curiously, using the same settings as speaker-test (which works >>>> fine), aplay hangs when trying to play multichannel audio files. Same >>>> for mplayer (with or without -channels settings). >>> What do you mean "hang"? >> By hang, I mean aplay and speaker-test open the device fine, and begin >> playing, but do not play any samples and then just sit there >> indefinitely. > > Interesting. So, you started like: > > % aplay -Dplug:surround51 somefile.wav Yes, originally I also put "-c 6" in there, but I just tried exactly as above, and got the same results. aplay looks like it starts playing, and then sits indefinitely. > ?? Does any process block the sound device? You can check it via > "lsof /dev/snd/pcm* /dev/dsp*", for example. nope, lsof as you suggested showed nothing is blocking, and when something else is using the device aplay will give me a "device busy" error which it does not in this case. Also, if I run aplay on the same audio file without specifying -Dplug:surround51 aplay will play the audio without hanging (albeit in 2 channel mode). >> Ie I see the following output from `speaker-test >> -Dplug:surround51 -c 6`: >> >> Playback device is plug:surround51 >> Stream parameters are 48000Hz, S16_LE, 6 channels >> ... >> 0 - Front Left >> >> Then no audio is heard and it sits there and does nothing until I press >> ctrl-c. >> >> The same goes for aplay using either -Dplug:surround51 OR -Dplug:surround71. > > "same" == "aplay doesn't process any samples"? Sorry, I can't say for sure what aplay is doing, but it looks to me like it does the same thing. It opens the sound card, and appears to start playing, but no audio is heard, and it sits indefinitely, just as speaker-test does when using plug:surround51. > What shows "aplay -v -Dplug:surround51 some6ch.wav" ? Here is the output: % aplay -v -Dplug:surround51 chan-id.wav Playing WAVE 'chan-id.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Channels 6 Plug PCM: Soft volume PCM Control: PCM Playback Volume min_dB: -48 resolution: 256 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 6 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 5460 period_size : 1365 period_time : 30952 tick_time : 1000 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1365 xfer_align : 1365 start_threshold : 5460 stop_threshold : 5460 silence_threshold: 0 silence_size : 0 boundary : 1431306240 Slave: Hardware PCM card 0 'HDA NVidia' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S16_LE subformat : STD channels : 6 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 5460 period_size : 1365 period_time : 30952 tick_time : 1000 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1365 xfer_align : 1365 start_threshold : 5460 stop_threshold : 5460 silence_threshold: 0 silence_size : 0 boundary : 1431306240 Then after that there is no output and it sits there until I ctlr-c it. Tim. ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
