ALSA: doc: ReSTize CMIPCI document
A simple conversion from a plain text file. Put to cards subdirectory. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Brief Notes on C-Media 8338/8738/8768/8770 Driver
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=================================================
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=================================================
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Brief Notes on C-Media 8338/8738/8768/8770 Driver
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=================================================
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Takashi Iwai <tiwai@suse.de>
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Takashi Iwai <tiwai@suse.de>
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Front/Rear Multi-channel Playback
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@ -30,19 +31,20 @@ The rear output can be heard only when "Four Channel Mode" switch is
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disabled. Otherwise no signal will be routed to the rear speakers.
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As default it's turned on.
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*** WARNING ***
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When "Four Channel Mode" switch is off, the output from rear speakers
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will be FULL VOLUME regardless of Master and PCM volumes.
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This might damage your audio equipment. Please disconnect speakers
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before your turn off this switch.
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*** WARNING ***
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.. WARNING::
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When "Four Channel Mode" switch is off, the output from rear speakers
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will be FULL VOLUME regardless of Master and PCM volumes [#]_.
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This might damage your audio equipment. Please disconnect speakers
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before your turn off this switch.
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[ Well.. I once got the output with correct volume (i.e. same with the
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.. [#]
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Well.. I once got the output with correct volume (i.e. same with the
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front one) and was so excited. It was even with "Four Channel" bit
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on and "double DAC" mode. Actually I could hear separate 4 channels
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from front and rear speakers! But.. after reboot, all was gone.
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It's a very pity that I didn't save the register dump at that
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time.. Maybe there is an unknown register to achieve this... ]
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time.. Maybe there is an unknown register to achieve this...
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If your card has an extra output jack for the rear output, the rear
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playback should be routed there as default. If not, there is a
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@ -73,12 +75,14 @@ cannot operate with full-duplex.
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The 4.0 and 5.1 modes are defined as the pcm "surround40" and "surround51"
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in alsa-lib. For example, you can play a WAV file with 6 channels like
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::
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% aplay -Dsurround51 sixchannels.wav
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For programming the 4/6 channel playback, you need to specify the PCM
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channels as you like and set the format S16LE. For example, for playback
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with 4 channels,
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::
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snd_pcm_hw_params_set_access(pcm, hw, SND_PCM_ACCESS_RW_INTERLEAVED);
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// or mmap if you like
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@ -89,13 +93,15 @@ and use the interleaved 4 channel data.
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There are some control switches affecting to the speaker connections:
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"Line-In Mode" - an enum control to change the behavior of line-in
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Line-In Mode
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an enum control to change the behavior of line-in
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jack. Either "Line-In", "Rear Output" or "Bass Output" can
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be selected. The last item is available only with model 039
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or newer.
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When "Rear Output" is chosen, the surround channels 3 and 4
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are output to line-in jack.
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"Mic-In Mode" - an enum control to change the behavior of mic-in
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Mic-In Mode
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an enum control to change the behavior of mic-in
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jack. Either "Mic-In" or "Center/LFE Output" can be
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selected.
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When "Center/LFE Output" is chosen, the center and bass
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@ -111,11 +117,14 @@ The SPDIF playback and capture are done via the third PCM device
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(hw:0,2). Usually this is assigned to the PCM device "spdif".
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The available rates are 44100 and 48000 Hz.
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For playback with aplay, you can run like below:
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::
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% aplay -Dhw:0,2 foo.wav
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or
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::
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% aplay -Dspdif foo.wav
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24bit format is also supported experimentally.
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@ -140,31 +149,40 @@ off. (Also don't forget to turn on "IEC958 Output Switch", too.)
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Additionally there are relevant control switches:
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"IEC958 Mix Analog" - Mix analog PCM playback and FM-OPL/3 streams and
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IEC958 Mix Analog
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Mix analog PCM playback and FM-OPL/3 streams and
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output through SPDIF. This switch appears only on old chip
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models (CM8738 033 and 037).
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Note: without this control you can output PCM to SPDIF.
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This is "mixing" of streams, so e.g. it's not for AC3 output
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(see the next section).
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"IEC958 In Select" - Select SPDIF input, the internal CD-in (false)
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IEC958 In Select
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Select SPDIF input, the internal CD-in (false)
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and the external input (true).
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"IEC958 Loop" - SPDIF input data is loop back into SPDIF
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IEC958 Loop
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SPDIF input data is loop back into SPDIF
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output (aka bypass)
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"IEC958 Copyright" - Set the copyright bit.
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IEC958 Copyright
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Set the copyright bit.
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"IEC958 5V" - Select 0.5V (coax) or 5V (optical) interface.
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IEC958 5V
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Select 0.5V (coax) or 5V (optical) interface.
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On some cards this doesn't work and you need to change the
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configuration with hardware dip-switch.
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"IEC958 In Monitor" - SPDIF input is routed to DAC.
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IEC958 In Monitor
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SPDIF input is routed to DAC.
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"IEC958 In Phase Inverse" - Set SPDIF input format as inverse.
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IEC958 In Phase Inverse
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Set SPDIF input format as inverse.
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[FIXME: this doesn't work on all chips..]
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"IEC958 In Valid" - Set input validity flag detection.
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IEC958 In Valid
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Set input validity flag detection.
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Note: When "PCM Playback Switch" is on, you'll hear the digital output
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stream through analog line-out.
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@ -217,7 +235,7 @@ to enable MIDI support. Valid I/O ports are 0x300, 0x310, 0x320 and
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With CMI8738 and newer chips, the MIDI interface is enabled by default
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and the driver automatically chooses a port address.
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There is _no_ hardware wavetable function on this chip (except for
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There is *no* hardware wavetable function on this chip (except for
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OPL3 synth below).
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What's said as MIDI synth on Windows is a software synthesizer
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emulation. On Linux use TiMidity or other softsynth program for
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@ -5,3 +5,4 @@ Card-Specific Information
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:maxdepth: 2
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joystick
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cmipci
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