| Message ID | 1452489739-25720-1-git-send-email-mengdong.lin@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, 11 Jan 2016 06:22:19 +0100, mengdong.lin@linux.intel.com wrote: > > From: Mengdong Lin <mengdong.lin@linux.intel.com> > > This helper function can convert a given sample rate range to > SNDRV_PCM_RATE_xxx bits. > > Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com> This function has an implicit assumption: the rates in the given range have only the pre-defined rates like 44100 or 16000. In anyway, feel free to take my ack: Acked-by: Takashi Iwai <tiwai@suse.de> Takashi > > diff --git a/include/sound/pcm.h b/include/sound/pcm.h > index b0be092..af1fb37 100644 > --- a/include/sound/pcm.h > +++ b/include/sound/pcm.h > @@ -1093,6 +1093,8 @@ unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); > unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); > unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, > unsigned int rates_b); > +unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, > + unsigned int rate_max); > > /** > * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer > diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c > index ebe8444..0b98f51 100644 > --- a/sound/core/pcm_misc.c > +++ b/sound/core/pcm_misc.c > @@ -565,3 +565,30 @@ unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, > return rates_a & rates_b; > } > EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect); > + > +/** > + * snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit > + * @rate_min: the minimum sample rate > + * @rate_max: the maximum sample rate > + * > + * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range, > + * or SNDRV_PCM_RATE_KNOT for an unknown range. > + */ > +unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, > + unsigned int rate_max) > +{ > + unsigned int rates = 0; > + int i; > + > + for (i = 0; i < snd_pcm_known_rates.count; i++) { > + if (snd_pcm_known_rates.list[i] >= rate_min > + && snd_pcm_known_rates.list[i] <= rate_max) > + rates |= 1 << i; > + } > + > + if (!rates) > + rates = SNDRV_PCM_RATE_KNOT; > + > + return rates; > +} > +EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits); > -- > 2.5.0 >
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index b0be092..af1fb37 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -1093,6 +1093,8 @@ unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, unsigned int rates_b); +unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, + unsigned int rate_max); /** * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c index ebe8444..0b98f51 100644 --- a/sound/core/pcm_misc.c +++ b/sound/core/pcm_misc.c @@ -565,3 +565,30 @@ unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, return rates_a & rates_b; } EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect); + +/** + * snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit + * @rate_min: the minimum sample rate + * @rate_max: the maximum sample rate + * + * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range, + * or SNDRV_PCM_RATE_KNOT for an unknown range. + */ +unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, + unsigned int rate_max) +{ + unsigned int rates = 0; + int i; + + for (i = 0; i < snd_pcm_known_rates.count; i++) { + if (snd_pcm_known_rates.list[i] >= rate_min + && snd_pcm_known_rates.list[i] <= rate_max) + rates |= 1 << i; + } + + if (!rates) + rates = SNDRV_PCM_RATE_KNOT; + + return rates; +} +EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits);