[alsa-devel] [PATCH 06/15] ALSA: pcm: Add DRM helper to set constraint for format

[Subhransu S. Prusty]

On Tue, Dec 01, 2015 at 01:55:03PM +0100, Takashi Iwai wrote:
> On Tue, 01 Dec 2015 18:47:02 +0100,
> Subhransu S. Prusty wrote:
> > 
> > +static int eld_limit_formats(struct snd_pcm_runtime *runtime, void *eld)
> > +{
> > +	u64 formats = SNDRV_PCM_FMTBIT_S16_LE;
> > +	int i;
> > +	const u8 *sad, *eld_buf = eld;
> > +
> > +	sad = drm_eld_sad(eld_buf);
> > +	if (!sad)
> > +		goto format_constraint;
> > +
> > +	for (i = drm_eld_sad_count(eld_buf); i > 0; i--, sad += 3) {
> > +		if (sad_format(sad) == 1) { /* AUDIO_CODING_TYPE_LPCM */
> > +
> > +			/* 20 bit */
> > +			if (sad_sample_bits_lpcm(sad) & 0x2)
> > +				formats |= SNDRV_PCM_FMTBIT_S32_LE;
> > +
> > +			/* 24 bit */
> > +			if (sad_sample_bits_lpcm(sad) & 0x4)
> > +				formats |= SNDRV_PCM_FMTBIT_S24_LE;
> 
> Does it work correctly with HD-audio...?

It works correctly. Do you suspect something wrong?
> 
> 
> Takashi

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