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axfer: print help for libasound backend

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This commit attempts to categorise existing options to four parts;
basics, software features, libasound plugin options and debug assistant.
These categories will assist users to get purpose of each option.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2018-12-17 15:51:03 +09:00 committed by Takashi Iwai
parent a37703614a
commit a0fb855e35
1 changed files with 24 additions and 1 deletions
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25
axfer/xfer-libasound.c
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@ -882,7 +882,30 @@ static void xfer_libasound_destroy(struct xfer_context *xfer)
static void xfer_libasound_help(struct xfer_context *xfer)
{
printf(" (placeholder)\n");
printf(
" [BASICS]\n"
" -D, --device select node by name in coniguration space\n"
" -N, --nonblock nonblocking mode\n"
" -M, --mmap use mmap(2) for zero copying technique\n"
" -F, --period-time interval between interrupts (msec unit)\n"
" --period-size interval between interrupts (frame unit)\n"
" -B, --buffer-time size of buffer for frame(msec unit)\n"
" --buffer-size size of buffer for frame(frame unit)\n"
" --waiter-type type of waiter to handle available frames\n"
" --sched-model model of process scheduling\n"
" [SOFTWARE FEATURES]\n"
" -A, --avail-min threshold of frames to wake up process\n"
" -R, --start-delay threshold of frames to start PCM substream\n"
" -T, --stop-delay threshold of frames to stop PCM substream\n"
" [LIBASOUND PLUGIN OPTIONS]\n"
" --disable-resample disable rate conversion for plug plugin\n"
" --disable-channels disable channel conversion for plug plugin\n"
" --disable-format disable format conversion for plug plugin\n"
" --disable-softvol disable software volume for sofvol plugin\n"
" [DEBUG ASSISTANT]\n"
" --fatal-errors finish at XRUN\n"
" --test-nowait busy poll without any waiter\n"
);
}
const struct xfer_data xfer_libasound = {