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| author | Daniel Mack <zonque@gmail.com> | 2013-04-17 00:01:39 +0800 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2013-04-18 10:03:47 +0200 |
| commit | 44dcbbb1cd615634c09d1bf31c124332795903a8 (patch) | |
| tree | ef2b5642e14bcbb8fe082e1e60c83975556ac1aa /sound/usb/card.h | |
| parent | d24f5061ee7b9b58a7e97f3c2a72f0a9b115e7e0 (diff) | |
| download | linux-44dcbbb1cd615634c09d1bf31c124332795903a8.tar.gz linux-44dcbbb1cd615634c09d1bf31c124332795903a8.tar.bz2 linux-44dcbbb1cd615634c09d1bf31c124332795903a8.zip | |
ALSA: snd-usb: add support for bit-reversed byte formats
There is quite some confusion around the bit-ordering in DSD samples,
and no general agreement that defines whether hardware is supposed to
expect the oldest sample in the MSB or the LSB of a byte.
ALSA will hence set the rule that on the software API layer, bytes
always carry the oldest bit in the most significant bit of a byte, and
the driver has to translate that at runtime in order to match the
hardware layout.
This patch adds support for this by adding a boolean flag to the
audio format struct.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/card.h')
| -rw-r--r-- | sound/usb/card.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h index ac55477ce6dd..bf2889a2cae5 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -29,6 +29,7 @@ struct audioformat { unsigned char clock; /* associated clock */ struct snd_pcm_chmap_elem *chmap; /* (optional) channel map */ bool dsd_dop; /* add DOP headers in case of DSD samples */ + bool dsd_bitrev; /* reverse the bits of each DSD sample */ }; struct snd_usb_substream; |