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The Advanced Linux Sound Architecture (ALSA) - library
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Ryan Underwood aa8253b684 Set C-Media USB 7.1 sound card to six_channel for surround40 
This 7.1 analog sound card identifies as the following:
0d8c:0102 C-Media Electronics, Inc. CM106 Like Sound Device (lsusb)
 1 [ICUSBAUDIO7D   ]: USB-Audio - ICUSBAUDIO7D (/proc/asound/cards)

It has the following four-channel analog stream layout:
  Interface 1
    Altset 3
    Format: S16_LE
    Channels: 4
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 44100, 48000
    Bits: 16
    Channel map: FL FR FC LFE
(/proc/asound/card1/stream0)

This layout makes it impossible to play audio to the surround (SL/SR)
speakers plugged into the "Surround" jack in 4 channel mode.  Instead,
set six_channel so that the six-channel layout will be used to access
those speakers:
  Interface 1
    Altset 4
    Format: S16_LE
    Channels: 6
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 44100, 48000
    Bits: 16
    Channel map: FL FR FC LFE SL SR

Tested with speaker-test -Dsurround40:CARD=ICUSBAUDIO7D,DEV=0 -c4

The speaker system that required surround40 in order to downmix LFE into
the front/rear mix is a Klipsch ProMedia v.2-400, which has 4 speakers
and a subwoofer with an internal crossover, connected via front and rear
stereo analog cables.

Signed-off-by: Ryan Underwood <nemesis@icequake.net>
2023-05-13 18:31:34 -05:00
.github/workflows github actions: move to checkout@v3 2022-05-19 12:38:18 +02:00
alsalisp Change FSF address (Franklin Street) 2017-11-14 14:29:26 +01:00
aserver pcm: fix for the unitialized write buffer 2022-05-20 08:47:07 +02:00
doc doc: ucm - more volume notes 2022-10-17 13:08:11 +02:00
include pcm: add SND_CTL_EINTR open mode 2023-05-03 15:59:15 +02:00
m4 Update the attributes.m4 macro file from xine 2020-01-03 19:13:13 +01:00
modules mixer: simple module: python 3.10 PyTuple_SET_ITEM() fix 2022-05-20 10:03:10 +02:00
src Set C-Media USB 7.1 sound card to six_channel for surround40 2023-05-13 18:31:34 -05:00
test test: BSD-like fixes 2023-02-03 13:22:04 +01:00
utils utils/alsa.m4: include <stdlib.h> for exit() 2023-01-29 18:51:54 +01:00
.gitignore initial version of .travis.yml file 2018-10-24 16:07:58 +02:00
acinclude.m4 fixed for the recent autoconf. 2004-01-26 15:52:17 +00:00
ChangeLog * update to libtool 1.3.3 1999-07-22 12:18:42 +00:00
configure.ac Release v1.2.9 2023-05-04 09:16:16 +02:00
COPYING Change FSF address (Franklin Street) 2017-11-14 14:29:26 +01:00
gitcompile gitcompile: fix 32 bit compilation support 2022-05-20 08:47:07 +02:00
INSTALL pcm: Add thread-safety to PCM API 2016-07-11 15:25:30 +02:00
Makefile.am Makefile: Add README.md to EXTRA_DIST 2020-12-10 10:37:13 +01:00
MEMORY-LEAK Initial version 2003-02-04 14:56:07 +00:00
NOTES Change assert condition in error message handler 2007-10-24 12:53:08 +02:00
README.md README: Add link to GitHub Actions 2022-05-19 12:47:24 +02:00
TODO Added snd_config_load_override(). 2002-01-09 21:28:15 +00:00

README.md

alsa-lib

Advanced Linux Sound Architecture (ALSA) project

Build alsa-lib

The alsa-lib is a library to interface with ALSA in the Linux kernel and virtual devices using a plugin system.

The up-to-date reference generated from sources can be accessed here:

http://www.alsa-project.org/alsa-doc/alsa-lib/

You may give a look for more information about the ALSA project to URL http://www.alsa-project.org.

Submitting patches

The preferred way to submit patches is by sending them by email to the alsa-devel mailing list. Sending mail to the list requires subscription, subscribe here: https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Add Takashi Iwai <tiwai@suse.de> and/or Jaroslav Kysela <perex@perex.cz> to Cc so that your patch won't be missed.

Patches are also accepted as GitHub pull requests.