^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) ========================================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) Guide to using M-Audio Audiophile USB with ALSA and Jack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) ========================================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) v1.5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) Thibault Le Meur <Thibault.LeMeur@supelec.fr>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) This document is a guide to using the M-Audio Audiophile USB (tm) device with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) ALSA and JACK.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) History
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) =======
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * v1.4 - Thibault Le Meur (2007-07-11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) - Added Low Endianness nature of 16bits-modes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) found by Hakan Lennestal <Hakan.Lennestal@brfsodrahamn.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) - Modifying document structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * v1.5 - Thibault Le Meur (2007-07-12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) - Added AC3/DTS passthru info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) Audiophile USB Specs and correct usage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) ======================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) This part is a reminder of important facts about the functions and limitations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) of the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) The device has 4 audio interfaces, and 2 MIDI ports:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * Analog Stereo Input (Ai)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) - This port supports 2 pairs of line-level audio inputs (1/4" TS and RCA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) - When the 1/4" TS (jack) connectors are connected, the RCA connectors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) are disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * Analog Stereo Output (Ao)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Digital Stereo Input (Di)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * Digital Stereo Output (Do)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * Midi In (Mi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Midi Out (Mo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) The internal DAC/ADC has the following characteristics:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * sample depth of 16 or 24 bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * sample rate from 8kHz to 96kHz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * Two interfaces can't use different sample depths at the same time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) Moreover, the Audiophile USB documentation gives the following Warning:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) Please exit any audio application running before switching between bit depths
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) Due to the USB 1.1 bandwidth limitation, a limited number of interfaces can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) activated at the same time depending on the audio mode selected:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * 16-bit/48kHz ==> 4 channels in + 4 channels out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) - Ai+Ao+Di+Do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * 24-bit/48kHz ==> 4 channels in + 2 channels out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) or 2 channels in + 4 channels out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) - Ai+Ao+Do or Ai+Di+Ao or Ai+Di+Do or Di+Ao+Do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * 24-bit/96kHz ==> 2 channels in _or_ 2 channels out (half duplex only)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) - Ai or Ao or Di or Do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) Important facts about the Digital interface:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) --------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * The Do port additionally supports surround-encoded AC-3 and DTS passthrough,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) though I haven't tested it under Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) - Note that in this setup only the Do interface can be enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * Apart from recording an audio digital stream, enabling the Di port is a way
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) to synchronize the device to an external sample clock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) - As a consequence, the Di port must be enable only if an active Digital
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) source is connected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) - Enabling Di when no digital source is connected can result in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) synchronization error (for instance sound played at an odd sample rate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) Audiophile USB MIDI support in ALSA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) ===================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) The Audiophile USB MIDI ports will be automatically supported once the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) following modules have been loaded:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * snd-usb-audio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * snd-seq-midi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) No additional setting is required.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) Audiophile USB Audio support in ALSA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) ====================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) Audio functions of the Audiophile USB device are handled by the snd-usb-audio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) module. This module can work in a default mode (without any device-specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) parameter), or in an "advanced" mode with the device-specific parameter called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) ``device_setup``.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) Default Alsa driver mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) The default behavior of the snd-usb-audio driver is to list the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) capabilities at startup and activate the required mode when required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) by the applications: for instance if the user is recording in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 24bit-depth-mode and immediately after wants to switch to a 16bit-depth mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) the snd-usb-audio module will reconfigure the device on the fly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) This approach has the advantage to let the driver automatically switch from sample
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) rates/depths automatically according to the user's needs. However, those who
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) are using the device under windows know that this is not how the device is meant to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) work: under windows applications must be closed before using the m-audio control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) panel to switch the device working mode. Thus as we'll see in next section, this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) Default Alsa driver mode can lead to device misconfigurations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) Let's get back to the Default Alsa driver mode for now. In this case the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) Audiophile interfaces are mapped to alsa pcm devices in the following
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) way (I suppose the device's index is 1):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * hw:1,0 is Ao in playback and Di in capture
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * hw:1,1 is Do in playback and Ai in capture
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * hw:1,2 is Do in AC3/DTS passthrough mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) In this mode, the device uses Big Endian byte-encoding so that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) supported audio format are S16_BE for 16-bit depth modes and S24_3BE for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 24-bits depth mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) One exception is the hw:1,2 port which was reported to be Little Endian
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) compliant (supposedly supporting S16_LE) but processes in fact only S16_BE streams.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) This has been fixed in kernel 2.6.23 and above and now the hw:1,2 interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) is reported to be big endian in this default driver mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) Examples:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * playing a S24_3BE encoded raw file to the Ao port::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) % aplay -D hw:1,0 -c2 -t raw -r48000 -fS24_3BE test.raw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * recording a S24_3BE encoded raw file from the Ai port::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) % arecord -D hw:1,1 -c2 -t raw -r48000 -fS24_3BE test.raw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * playing a S16_BE encoded raw file to the Do port::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) % aplay -D hw:1,1 -c2 -t raw -r48000 -fS16_BE test.raw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * playing an ac3 sample file to the Do port::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) % aplay -D hw:1,2 --channels=6 ac3_S16_BE_encoded_file.raw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) If you're happy with the default Alsa driver mode and don't experience any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) issue with this mode, then you can skip the following chapter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) Advanced module setup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) ---------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) Due to the hardware constraints described above, the device initialization made
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) by the Alsa driver in default mode may result in a corrupted state of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) device. For instance, a particularly annoying issue is that the sound captured
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) from the Ai interface sounds distorted (as if boosted with an excessive high
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) volume gain).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) For people having this problem, the snd-usb-audio module has a new module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) parameter called ``device_setup`` (this parameter was introduced in kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) release 2.6.17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) Initializing the working mode of the Audiophile USB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) As far as the Audiophile USB device is concerned, this value let the user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) specify:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * the sample depth
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * the sample rate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * whether the Di port is used or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) When initialized with ``device_setup=0x00``, the snd-usb-audio module has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) the same behaviour as when the parameter is omitted (see paragraph "Default
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) Alsa driver mode" above)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) Others modes are described in the following subsections.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 16-bit modes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) ~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) The two supported modes are:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * ``device_setup=0x01``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) - 16bits 48kHz mode with Di disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) - Ai,Ao,Do can be used at the same time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) - hw:1,0 is not available in capture mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) - hw:1,2 is not available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * ``device_setup=0x11``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) - 16bits 48kHz mode with Di enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) - Ai,Ao,Di,Do can be used at the same time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) - hw:1,0 is available in capture mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) - hw:1,2 is not available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) In this modes the device operates only at 16bits-modes. Before kernel 2.6.23,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) the devices where reported to be Big-Endian when in fact they were Little-Endian
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) so that playing a file was a matter of using:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) % aplay -D hw:1,1 -c2 -t raw -r48000 -fS16_BE test_S16_LE.raw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) where "test_S16_LE.raw" was in fact a little-endian sample file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) Thanks to Hakan Lennestal (who discovered the Little-Endiannes of the device in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) these modes) a fix has been committed (expected in kernel 2.6.23) and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) Alsa now reports Little-Endian interfaces. Thus playing a file now is as simple as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) using:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) % aplay -D hw:1,1 -c2 -t raw -r48000 -fS16_LE test_S16_LE.raw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 24-bit modes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) ~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) The three supported modes are:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * ``device_setup=0x09``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) - 24bits 48kHz mode with Di disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) - Ai,Ao,Do can be used at the same time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) - hw:1,0 is not available in capture mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) - hw:1,2 is not available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * ``device_setup=0x19``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) - 24bits 48kHz mode with Di enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) - 3 ports from {Ai,Ao,Di,Do} can be used at the same time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) - hw:1,0 is available in capture mode and an active digital source must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) connected to Di
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) - hw:1,2 is not available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * ``device_setup=0x0D`` or ``0x10``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) - 24bits 96kHz mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) - Di is enabled by default for this mode but does not need to be connected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) to an active source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) - Only 1 port from {Ai,Ao,Di,Do} can be used at the same time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) - hw:1,0 is available in captured mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) - hw:1,2 is not available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) In these modes the device is only Big-Endian compliant (see "Default Alsa driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) mode" above for an aplay command example)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) AC3 w/ DTS passthru mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) ~~~~~~~~~~~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) Thanks to Hakan Lennestal, I now have a report saying that this mode works.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * ``device_setup=0x03``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) - 16bits 48kHz mode with only the Do port enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) - AC3 with DTS passthru
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) - Caution with this setup the Do port is mapped to the pcm device hw:1,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) The command line used to playback the AC3/DTS encoded .wav-files in this mode:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) % aplay -D hw:1,0 --channels=6 ac3_S16_LE_encoded_file.raw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) How to use the ``device_setup`` parameter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) The parameter can be given:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * By manually probing the device (as root):::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) # modprobe -r snd-usb-audio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) # modprobe snd-usb-audio index=1 device_setup=0x09
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * Or while configuring the modules options in your modules configuration file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) (typically a .conf file in /etc/modprobe.d/ directory:::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) alias snd-card-1 snd-usb-audio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) options snd-usb-audio index=1 device_setup=0x09
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) CAUTION when initializing the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) -------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * Correct initialization on the device requires that device_setup is given to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) the module BEFORE the device is turned on. So, if you use the "manual probing"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) method described above, take care to power-on the device AFTER this initialization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * Failing to respect this will lead to a misconfiguration of the device. In this case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) turn off the device, unprobe the snd-usb-audio module, then probe it again with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) correct device_setup parameter and then (and only then) turn on the device again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * If you've correctly initialized the device in a valid mode and then want to switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) to another mode (possibly with another sample-depth), please use also the following
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) procedure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) - first turn off the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) - de-register the snd-usb-audio module (modprobe -r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) - change the device_setup parameter by changing the device_setup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) option in ``/etc/modprobe.d/*.conf``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) - turn on the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * A workaround for this last issue has been applied to kernel 2.6.23, but it may not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) be enough to ensure the 'stability' of the device initialization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) Technical details for hackers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) -----------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) This section is for hackers, wanting to understand details about the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) internals and how Alsa supports it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) Audiophile USB's ``device_setup`` structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) If you want to understand the device_setup magic numbers for the Audiophile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) USB, you need some very basic understanding of binary computation. However,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) this is not required to use the parameter and you may skip this section.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) The device_setup is one byte long and its structure is the following:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) +---+---+---+---+---+---+---+---+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) | b7| b6| b5| b4| b3| b2| b1| b0|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) +---+---+---+---+---+---+---+---+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) | 0 | 0 | 0 | Di|24B|96K|DTS|SET|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) +---+---+---+---+---+---+---+---+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) Where:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * b0 is the ``SET`` bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) - it MUST be set if device_setup is initialized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * b1 is the ``DTS`` bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) - it is set only for Digital output with DTS/AC3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) - this setup is not tested
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * b2 is the Rate selection flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) - When set to ``1`` the rate range is 48.1-96kHz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) - Otherwise the sample rate range is 8-48kHz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * b3 is the bit depth selection flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) - When set to ``1`` samples are 24bits long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) - Otherwise they are 16bits long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) - Note that b2 implies b3 as the 96kHz mode is only supported for 24 bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) samples
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) * b4 is the Digital input flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) - When set to ``1`` the device assumes that an active digital source is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) connected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) - You shouldn't enable Di if no source is seen on the port (this leads to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) synchronization issues)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) - b4 is implied by b2 (since only one port is enabled at a time no synch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) error can occur)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * b5 to b7 are reserved for future uses, and must be set to ``0``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) - might become Ao, Do, Ai, for b7, b6, b4 respectively
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) Caution:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * there is no check on the value you will give to device_setup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) - for instance choosing 0x05 (16bits 96kHz) will fail back to 0x09 since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) b2 implies b3. But _there_will_be_no_warning_ in /var/log/messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * Hardware constraints due to the USB bus limitation aren't checked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) - choosing b2 will prepare all interfaces for 24bits/96kHz but you'll
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) only be able to use one at the same time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) USB implementation details for this device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) You may safely skip this section if you're not interested in driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) hacking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) This section describes some internal aspects of the device and summarizes the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) data I got by usb-snooping the windows and Linux drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) The M-Audio Audiophile USB has 7 USB Interfaces:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) a "USB interface":
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) * USB Interface nb.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) * USB Interface nb.1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) - Audio Control function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) * USB Interface nb.2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) - Analog Output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * USB Interface nb.3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) - Digital Output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * USB Interface nb.4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) - Analog Input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * USB Interface nb.5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) - Digital Input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * USB Interface nb.6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) - MIDI interface compliant with the MIDIMAN quirk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) Each interface has 5 altsettings (AltSet 1,2,3,4,5) except:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * Interface 3 (Digital Out) has an extra Alset nb.6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * Interface 5 (Digital In) does not have Alset nb.3 and 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) Here is a short description of the AltSettings capabilities:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * AltSettings 1 corresponds to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) - 24-bit depth, 48.1-96kHz sample mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) - Adaptive playback (Ao and Do), Synch capture (Ai), or Asynch capture (Di)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * AltSettings 2 corresponds to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) - 24-bit depth, 8-48kHz sample mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) - Asynch capture and playback (Ao,Ai,Do,Di)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * AltSettings 3 corresponds to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) - 24-bit depth, 8-48kHz sample mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) - Synch capture (Ai) and Adaptive playback (Ao,Do)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) * AltSettings 4 corresponds to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) - 16-bit depth, 8-48kHz sample mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) - Asynch capture and playback (Ao,Ai,Do,Di)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * AltSettings 5 corresponds to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) - 16-bit depth, 8-48kHz sample mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) - Synch capture (Ai) and Adaptive playback (Ao,Do)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * AltSettings 6 corresponds to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) - 16-bit depth, 8-48kHz sample mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) - Synch playback (Do), audio format type III IEC1937_AC-3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) In order to ensure a correct initialization of the device, the driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) *must* *know* how the device will be used:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) * if DTS is chosen, only Interface 2 with AltSet nb.6 must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) registered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) * if 96KHz only AltSets nb.1 of each interface must be selected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * if samples are using 24bits/48KHz then AltSet 2 must me used if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) Digital input is connected, and only AltSet nb.3 if Digital input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) is not connected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * if samples are using 16bits/48KHz then AltSet 4 must me used if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) Digital input is connected, and only AltSet nb.5 if Digital input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) is not connected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) When device_setup is given as a parameter to the snd-usb-audio module, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) parse_audio_endpoints function uses a quirk called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) ``audiophile_skip_setting_quirk`` in order to prevent AltSettings not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) corresponding to device_setup from being registered in the driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) Audiophile USB and Jack support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) ===============================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) This section deals with support of the Audiophile USB device in Jack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) There are 2 main potential issues when using Jackd with the device:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * support for Big-Endian devices in 24-bit modes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * support for 4-in / 4-out channels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) Direct support in Jackd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) -----------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) Jack supports big endian devices only in recent versions (thanks to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) Andreas Steinmetz for his first big-endian patch). I can't remember
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) exactly when this support was released into jackd, let's just say that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) with jackd version 0.103.0 it's almost ok (just a small bug is affecting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) 16bits Big-Endian devices, but since you've read carefully the above
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) paragraphs, you're now using kernel >= 2.6.23 and your 16bits devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) are now Little Endians ;-) ).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) You can run jackd with the following command for playback with Ao and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) record with Ai:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) % jackd -R -dalsa -Phw:1,0 -r48000 -p128 -n2 -D -Chw:1,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) Using Alsa plughw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) -----------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) If you don't have a recent Jackd installed, you can downgrade to using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) the Alsa ``plug`` converter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) For instance here is one way to run Jack with 2 playback channels on Ao and 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) capture channels from Ai:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) % jackd -R -dalsa -dplughw:1 -r48000 -p256 -n2 -D -Cplughw:1,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) However you may see the following warning message:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) You appear to be using the ALSA software "plug" layer, probably a result of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) using the "default" ALSA device. This is less efficient than it could be.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) Consider using a hardware device instead rather than using the plug layer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) Getting 2 input and/or output interfaces in Jack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) ------------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) As you can see, starting the Jack server this way will only enable 1 stereo
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) input (Di or Ai) and 1 stereo output (Ao or Do).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) This is due to the following restrictions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) * Jack can only open one capture device and one playback device at a time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * The Audiophile USB is seen as 2 (or three) Alsa devices: hw:1,0, hw:1,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) (and optionally hw:1,2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) If you want to get Ai+Di and/or Ao+Do support with Jack, you would need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) combine the Alsa devices into one logical "complex" device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) If you want to give it a try, I recommend reading the information from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) this page: http://www.sound-man.co.uk/linuxaudio/ice1712multi.html
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) It is related to another device (ice1712) but can be adapted to suit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) the Audiophile USB.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) Enabling multiple Audiophile USB interfaces for Jackd will certainly require:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) * Making sure your Jackd version has the MMAP_COMPLEX patch (see the ice1712 page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * (maybe) patching the alsa-lib/src/pcm/pcm_multi.c file (see the ice1712 page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) * define a multi device (combination of hw:1,0 and hw:1,1) in your .asoundrc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) * start jackd with this device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) I had no success in testing this for now, if you have any success with this kind
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) of setup, please drop me an email.
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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