linux/sound/firewire/tascam
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
..
amdtp-tascam.c ALSA: firewire: remove support for 16 bit PCM samples in playback substream 2017-05-22 16:24:08 +02:00
Makefile ALSA: firewire-tascam: add support for MIDI functionality 2015-10-12 14:16:18 +02:00
tascam-hwdep.c ALSA: firewire-tascam: enclose identifiers referred by single function 2017-01-05 16:58:10 +01:00
tascam-midi.c ALSA: firewire-tascam: support drain callback for MIDI playback substream 2017-04-14 14:50:43 +02:00
tascam-pcm.c ALSA: firewire: remove support for 16 bit PCM samples in playback substream 2017-05-22 16:24:08 +02:00
tascam-proc.c ALSA: firewire-tascam: add proc node to show firmware information 2015-10-02 18:17:01 +02:00
tascam-stream.c ALSA: firewire-tascam: Fix to handle error from initialization of stream data 2017-01-03 11:36:34 +01:00
tascam-transaction.c ALSA: firewire-tascam: move message parameters for async midi port 2017-04-14 14:50:40 +02:00
tascam.c ALSA: firewire-tascam: deleyed registration of sound card 2016-04-25 10:40:42 +02:00
tascam.h ALSA: firewire: remove support for 16 bit PCM samples in playback substream 2017-05-22 16:24:08 +02:00