From what I can gather about this chip, it is frequency locked at 48000. Hence the driver or application must perform all sample rate conversion. The alsa driver seems incapable of this, however several applications can do it: mplayer, mpg123 and xmms (w/plugins, such as Crossfade Plugin) work fine for me.
Regarding the sound quality, on a scale of poor-fair-good-excellent, I would rate it 'fair' without much hope of improvement. This is not a driver issue, in my opinion, but rather it is simply a case of cheap hardware. I use the 0.9 driver and used to hear clicks. I adjusted the mixer as follows and now I don't notice any more weird noises: Simple mixer control 'Master',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 26 [84%] [on] Front Right: Playback 26 [84%] [on] Simple mixer control 'Master Mono',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 31 Mono: Playback 0 [0%] [off] Simple mixer control 'Headphone',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 0 [0%] [off] Front Right: Playback 0 [0%] [off] Simple mixer control '3D Control - Center',0 Capabilities: volume volume-joined pswitch Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 0 [0%] Playback [on] Simple mixer control '3D Control - Depth',0 Capabilities: volume volume-joined pswitch Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 0 [0%] Playback [on] Simple mixer control '3D Control - Switch',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'PCM',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 26 [84%] [on] Front Right: Playback 26 [84%] [on] Simple mixer control 'Line',0 Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 26 [84%] [on] Capture [on] Front Right: Playback 26 [84%] [on] Capture [on] Simple mixer control 'CD',0 Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 0 [0%] [off] Capture [off] Front Right: Playback 0 [0%] [off] Capture [off] Simple mixer control 'Mic',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Mono Capture channels: Front Left - Front Right Limits: Playback 0 - 15 Mono: Playback 0 [0%] [off] Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'Mic Boost (+20dB)',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Video',0 Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 0 [0%] [off] Capture [off] Front Right: Playback 0 [0%] [off] Capture [off] Simple mixer control 'Phone',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Mono Capture channels: Front Left - Front Right Limits: Playback 0 - 15 Mono: Playback 0 [0%] [off] Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'PC Speaker',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 15 Mono: Playback 0 [0%] [off] Simple mixer control 'Aux',0 Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 0 [0%] [off] Capture [off] Front Right: Playback 0 [0%] [off] Capture [off] Simple mixer control 'Capture',0 Capabilities: volume pswitch pswitch-joined Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 15 Front Left: 13 [87%] Playback [on] Front Right: 13 [87%] Playback [on] Simple mixer control 'Mix',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Front Left - Front Right Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'Mix Mono',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Front Left - Front Right Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'ADC/DAC Loopback',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'External Amplifier Power Down',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] As you can see, most of the available devices are muted. This may or may not have solved the clicking/noise problem, I don't remember. However, I do remember this: under WinXP, the default mixer volume for PCM was set way too high; this produced the clicking/noise problem (and worse!). By lowering the volume I eliminated the noise. That experience led me to adjust the alsa mixer and now the noise is gone for Linux, too. My system: Shuttle AK31A (Via 266a) Athlon XP 1600 256 DDR RAM TNT2 w/Nvidia drivers ATI TV-Wonder Linux 2.4.17 XFree86 4.1.0 I hope this is useful for you. Todd Stefan Lange wrote: > Hi, > I'm using the ac97-codec for the onboard sound of my motherboard. It's > an EPOX 8KHA+ with VIA KT266A chipset, with a 8233 southbridge. I'm > using the snd-via8233 driver from current cvs. It works, but there are > some quality issues: > > The sampling rate seems to be locked at 48 kHz > the snd_ac97_clock option doesn't seem to work for changing the rate > to 44.1 kHz > I changed xmms to output 48 kHz, which made quality a lot better. Is > that a hardware or a driver limitation? > > Although playback is quite OK with 48 kHz, there a some really > annoying "blips and clicks" now and then. I didn't investigate that > very thoroughly, but I think I didn't hear these clicks using win98 on > the same machine, so I assume it's a driver issue. > > Am I missing out something, or is it the driver's fault? > > Thanks in advance > > Stefan > > Please CC me, as I'm not subscribed to the list > > _______________________________________________ > Alsa-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/alsa-user > _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
