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Sound Software: Difference between revisions

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Sound on Linux is the absolute biggest bunch of bullshit ever.
Sound on Linux is the absolute biggest bunch of bullshit ever, closely trailed by sound on computers and sound itself.
 
[[File:Pcm1792a.jpeg|thumb|right|Burr Brown PCM 1792A block diagram]]
==Terminology==
==Terminology==
[[File:Burrbrown1792a.jpeg|right|thumb|Burr Brown PCM 1792A DAC]]
* HDA: Intel High Definition Audio specification
* HDA: Intel High Definition Audio specification
* ELD: [[EDID]]-Like Data. Structured capability data returned by graphics-oriented devices.
* ELD: [[EDID]]-Like Data. Structured capability data returned by graphics-oriented devices.
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** PD indicates a change in presence or the ELDV bit
** PD indicates a change in presence or the ELDV bit
** ELDV indicates new ELD information
** ELDV indicates new ELD information
* EAX: Environmental audio eXtensions
* S/PDIF: Sony/Phillips Digital Interconnect Format (IEC 60958 type II / IEC 958)
** 10m max cable distance
** TOSLINK F05 / EIAJ-Optical and coax RCA connections
** Carries DTS and Dolby Digital compressed audio for >2 PCM (IEC 61937)
* AES3: commercial-grade
** 3-pin XLR (balanced) and BNC (unbalanced) connections
* CDDA: CD Digital Audio, 2-channel 44.1k PCM
* DAT: Digital Audio Tape, a 48k/44.1k/32k medium using 4mm magnetic tape
==Hardware==
I recommend the [http://www.guru3d.com/article/asus-xonar-essence-st-deluxe-review/ Xonar Essence ST] PCI card, making use of the [[#File:Pcm1792a.pdf|Burr Brown PCM 1792A]] DAC and Cirrus CS5381 ADC, for an in-machine solution.
* You'll need the <tt>snd-virtuoso</tt> ALSA driver (C-Media CMI8788 Oxygen HD Audio).
===USB DACs===
* Watch for true USB Audio Class 2.0 and solid asynchronous solutions
* "[http://www.eetimes.com/design/audio-design/4009467/The-D-A-diaries-A-personal-memoir-of-engineering-heartache-and-triumph The D-A Diaries]" is an excellent article regarding the difficulties of producing accurate sound via USB output.
** Essentially: USB has a clockless wire, thus there must be clocks on each side, which *will* drift
** If the USB device doesn't have its own crystal, it might even time based off AC power
* USB Audio Class 1 is limited to the 24bit, 96KHz maximum supported by USB 1.x (12Mbps)


== Kernel ==
== Kernel ==
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===ALSA configuration===
===ALSA configuration===
* What the fuck ought go in /etc/asoundrc? It's a complete enigma.
* What ought go in /etc/asoundrc? It's a complete enigma.
** FIXME
 
==HDMI==
* FIXME


== Sound Servers ==
== Sound Servers ==
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* The [http://download.intel.com/standards/hdaudio/pdf/hda034-a2.pdf Intel High Definition Audio] specification  
* The [http://download.intel.com/standards/hdaudio/pdf/hda034-a2.pdf Intel High Definition Audio] specification  
* The [http://alsa.opensrc.org ALSA Wiki]
* The [http://alsa.opensrc.org ALSA Wiki]
* The (somewhat outdated) [http://lau.linuxaudio.org/audio_quality_howto.htm Linux High-Quality Audio HOWTO]
* The computeraudiophile.com [http://www.computeraudiophile.com/faq Computer Audiophile FAQs]
* The computeraudiophile.com [http://www.computeraudiophile.com/faq Computer Audiophile FAQs]
* "[http://www.head-fi.org/t/160612/pros-cons-of-usb-dac-against-sound-card Pros and Cons of USB DACs]" on head-fi.org
* "[http://www.mythtv.org/wiki/Configuring_Digital_Sound Configuring Digital Sound]" on the MythTV wiki
* [http://www.thewelltemperedcomputer.com/index.html The Well-Tempered Computer] and the [http://www.digitalaudioblog.com Digital Audio Blog]
* ...and, of course, [http://www.stereophile.com/ stereophile.com]
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