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