[PATCH v8 1/6] ALSA: pcm: add IEC958 channel status helper for hw_params

[Russell King - ARM Linux]

On Tue, Mar 29, 2016 at 10:54:08AM +0200, Takashi Iwai wrote:
> On Thu, 17 Mar 2016 13:22:29 +0100,
> Jyri Sarha wrote:
> > 
> > Add IEC958 channel status helper that gets the audio properties from
> > snd_pcm_hw_params instead of snd_pcm_runtime. This is needed to
> > produce the channel status bits already in audio stream configuration
> > phase.
> > 
> > Signed-off-by: Jyri Sarha <jsarha at ti.com>
> 
> This patch looks almost good to me, but...
> 
> > @@ -71,6 +59,7 @@ int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
> >  			     IEC958_AES4_CON_MAX_WORDLEN_24;
> >  			break;
> >  		case 24:
> > +		case 32: /* Assume 24-bit width for 32-bit samples. */
> >  			ws = IEC958_AES4_CON_WORDLEN_24_20 |
> >  			     IEC958_AES4_CON_MAX_WORDLEN_24;
> >  			break;
> 
> ... this change is silently slipped in.  It should be mentioned in the
> changelog, or split to another patch, as this is basically an
> orthogonal change.

Does it even make sense - AES doesn't have support for 32-bit samples,
it can only ever truncate them down to 24-bit.

-- 
RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.