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[ALSA] pcm: add snd_pcm_rate_to_rate_bit() helper

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Add a snd_pcm_rate_to_rate_bit() function to factor out common code used
by several drivers.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Clemens Ladisch
2007-08-13 17:40:54 +02:00
committed by Jaroslav Kysela
parent 7653d55760
commit 918f3a0e8c
8 changed files with 47 additions and 145 deletions
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29
sound/usb/usbaudio.c
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@ -123,7 +123,6 @@ struct audioformat {
unsigned int rate_min, rate_max; /* min/max rates */
unsigned int nr_rates; /* number of rate table entries */
unsigned int *rate_table; /* rate table */
unsigned int needs_knot; /* any unusual rates? */
};
struct snd_usb_substream;
@ -1761,7 +1760,7 @@ static int check_hw_params_convention(struct snd_usb_substream *subs)
channels[f->format] |= (1 << f->channels);
rates[f->format] |= f->rates;
/* needs knot? */
if (f->needs_knot)
if (f->rates & SNDRV_PCM_RATE_KNOT)
goto __out;
}
/* check whether channels and rates match for all formats */
@ -1817,7 +1816,7 @@ static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
return 0;
count += fp->nr_rates;
if (fp->needs_knot)
if (fp->rates & SNDRV_PCM_RATE_KNOT)
needs_knot = 1;
}
if (!needs_knot)
@ -2453,7 +2452,7 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform
unsigned char *fmt, int offset)
{
int nr_rates = fmt[offset];
int found;
if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
chip->dev->devnum, fp->iface, fp->altsetting);
@ -2464,20 +2463,15 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform
/*
* build the rate table and bitmap flags
*/
int r, idx, c;
int r, idx;
unsigned int nonzero_rates = 0;
/* this table corresponds to the SNDRV_PCM_RATE_XXX bit */
static unsigned int conv_rates[] = {
5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
64000, 88200, 96000, 176400, 192000
};
fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
if (fp->rate_table == NULL) {
snd_printk(KERN_ERR "cannot malloc\n");
return -1;
}
fp->needs_knot = 0;
fp->nr_rates = nr_rates;
fp->rate_min = fp->rate_max = combine_triple(&fmt[8]);
for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
@ -2493,23 +2487,12 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform
fp->rate_min = rate;
else if (rate > fp->rate_max)
fp->rate_max = rate;
found = 0;
for (c = 0; c < (int)ARRAY_SIZE(conv_rates); c++) {
if (rate == conv_rates[c]) {
found = 1;
fp->rates |= (1 << c);
break;
}
}
if (!found)
fp->needs_knot = 1;
fp->rates |= snd_pcm_rate_to_rate_bit(rate);
}
if (!nonzero_rates) {
hwc_debug("All rates were zero. Skipping format!\n");
return -1;
}
if (fp->needs_knot)
fp->rates |= SNDRV_PCM_RATE_KNOT;
} else {
/* continuous rates */
fp->rates = SNDRV_PCM_RATE_CONTINUOUS;