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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2019-01-27 14:39:18 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-01-29 16:43:24 +0100 |
| commit | b6142611c68a380644ce34f885e2d67da084b538 (patch) | |
| tree | b31eecba24f8e509fc625ebfbf5fde38d2a3d378 /axfer | |
| parent | 83bce86c26be6c04bcef584fbe00f320b3582c92 (diff) | |
| download | alsa-utils-b6142611c68a380644ce34f885e2d67da084b538.tar.gz | |
axfer: fulfill section for backward compatibitity for chmap option
At present, axfer losts backward compatibility to aplay in a point of
'chmap' option.
This commit filfills a section to describe lose of backward compatibility
of chmap option.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'axfer')
| -rw-r--r-- | axfer/axfer-transfer.1 | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/axfer/axfer-transfer.1 b/axfer/axfer-transfer.1 index 02e5b4c..1fdfc91 100644 --- a/axfer/axfer-transfer.1 +++ b/axfer/axfer-transfer.1 @@ -873,6 +873,15 @@ input handling in main loop and leave bothersome operation to maintain PCM substream. .TP +.I \-m, \-\-chmap=CH1,CH2,... +ALSA PCM core and control core doesn't support this feature, therefore +remapping should be done in userspace. This brings overhead to align audio +data frames, especially for mmap operation. Furthermore, as of alsa-lib v1.1.8, +some plugins don't support this feature expectedly, thus this option is a lack +of transparent operation. At present, this option is not supported yet not to +confuse users. + +.TP .I SIGTSTP, SIGCONT This performs suspend/resume of PCM substream. In aplay(1) implementation, these operations bring XRUN state to the substream, and suspend/resume is done |