linux-stable/sound/firewire/dice
Takashi Sakamoto a02cb8f8de ALSA: firewire: remove support for 16 bit PCM samples in playback substream
In IEC 61883-6, AM824 is described as format of data block. In this
format, one data block consists of several data channels, which is aligned
to 32 bit. One data channel has 8 bit label field and 24 bit data field.
PCM frames are transferred in Multi Bit Linear Audio (MBLA) data channel.
This channel can include 16/20/24 bit PCM sample.

As long as I know, models which support IEC 61883-1/6 doesn't allow to
switch bit length of PCM sample in MBLA data channel. They always
transmit/receive PCM frames of 24 bit length. This can be seen for the
other models which support protocols similar to IEC 61883-1/6.

On the other hand, current drivers for these protocols supports 16 bit
length PCM sample in playback substream. In this case, PCM sample is put
into the MBLA data channel with 8 bit padding in LSB side. Although 16
bit PCM sample is major because it's in CD format, this doesn't represent
device capability as is.

This commit removes support for 16 bit PCM samples in playback substream.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-05-22 16:24:08 +02:00
..
dice-hwdep.c ALSA: dice: Split hwdep functionality into a file 2014-11-29 20:08:19 +01:00
dice-interface.h ALSA: dice: ensure transmission speed for transmitted packets 2017-01-03 11:38:39 +01:00
dice-midi.c ALSA: firewire: Constify snd_rawmidi_ops 2017-01-12 12:50:38 +01:00
dice-pcm.c ALSA: firewire: remove support for 16 bit PCM samples in playback substream 2017-05-22 16:24:08 +02:00
dice-proc.c Revert "ALSA: dice: fix wrong offsets for Dice interface" 2015-03-10 15:26:25 +01:00
dice-stream.c ALSA: dice: ensure transmission speed for transmitted packets 2017-01-03 11:38:39 +01:00
dice-transaction.c ALSA: dice: change notification mask to detect lock status change 2016-02-12 09:52:43 +01:00
dice.c ALSA: dice: add support for M-Audio Profire 610 and perhaps 2626 2016-05-08 11:17:37 +02:00
dice.h sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
Makefile ALSA: fireworks/bebob/oxfw/dice: enable to make as built-in 2015-10-18 09:08:11 +02:00