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ALSA: usb-audio: Simplify rate_min/max and rates set up

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There are multiple places in format.c performing the similar code for
setting the rate_min, rate_max and rates fields.  This patch unifies
those in a helper function and calls it at the end of the parser phase
so that all rate_table entries have been already determined.

No functional changes, just a minor code refactoring.

Tested-by: Keith Milner <kamilner@superlative.org>
Tested-by: Dylan Robinson <dylan_robinson@motu.com>
Link: https://lore.kernel.org/r/20201123085347.19667-33-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2020-11-23 09:53:38 +01:00
parent 3d58760f4d
commit 13ee03361f
1 changed files with 24 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
sound/usb/format.c
View File

@ -164,6 +164,23 @@ static int set_fixed_rate(struct audioformat *fp, int rate, int rate_bits)
return 0;
}
/* set up rate_min, rate_max and rates from the rate table */
static void set_rate_table_min_max(struct audioformat *fp)
{
unsigned int rate;
int i;
fp->rate_min = INT_MAX;
fp->rate_max = 0;
fp->rates = 0;
for (i = 0; i < fp->nr_rates; i++) {
rate = fp->rate_table[i];
fp->rate_min = min(fp->rate_min, rate);
fp->rate_max = max(fp->rate_max, rate);
fp->rates |= snd_pcm_rate_to_rate_bit(rate);
}
}
/*
* parse the format descriptor and stores the possible sample rates
* on the audioformat table (audio class v1).
@ -198,7 +215,6 @@ static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audiof
return -ENOMEM;
fp->nr_rates = 0;
fp->rate_min = fp->rate_max = 0;
for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
unsigned int rate = combine_triple(&fmt[idx]);
if (!rate)
@ -217,13 +233,7 @@ static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audiof
chip->usb_id == USB_ID(0x041e, 0x4068)))
rate = 8000;
fp->rate_table[fp->nr_rates] = rate;
if (!fp->rate_min || rate < fp->rate_min)
fp->rate_min = rate;
if (!fp->rate_max || rate > fp->rate_max)
fp->rate_max = rate;
fp->rates |= snd_pcm_rate_to_rate_bit(rate);
fp->nr_rates++;
fp->rate_table[fp->nr_rates++] = rate;
}
if (!fp->nr_rates) {
usb_audio_info(chip,
@ -231,6 +241,7 @@ static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audiof
fp->iface, fp->altsetting);
return -EINVAL;
}
set_rate_table_min_max(fp);
} else {
/* continuous rates */
fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
@ -336,8 +347,6 @@ static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
{
int i, nr_rates = 0;
fp->rates = fp->rate_min = fp->rate_max = 0;
for (i = 0; i < nr_triplets; i++) {
int min = combine_quad(&data[2 + 12 * i]);
int max = combine_quad(&data[6 + 12 * i]);
@ -373,12 +382,6 @@ static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
if (fp->rate_table)
fp->rate_table[nr_rates] = rate;
if (!fp->rate_min || rate < fp->rate_min)
fp->rate_min = rate;
if (!fp->rate_max || rate > fp->rate_max)
fp->rate_max = rate;
fp->rates |= snd_pcm_rate_to_rate_bit(rate);
nr_rates++;
if (nr_rates >= MAX_NR_RATES) {
usb_audio_err(chip, "invalid uac2 rates\n");
@ -459,9 +462,6 @@ static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip,
struct usb_device *dev = chip->dev;
unsigned int *table;
unsigned int nr_rates;
unsigned int rate_min = 0x7fffffff;
unsigned int rate_max = 0;
unsigned int rates = 0;
int i, err;
table = kcalloc(fp->nr_rates, sizeof(*table), GFP_KERNEL);
@ -478,14 +478,8 @@ static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip,
if (err < 0)
continue;
if (check_valid_altsetting_v2v3(chip, fp->iface, fp->altsetting)) {
if (check_valid_altsetting_v2v3(chip, fp->iface, fp->altsetting))
table[nr_rates++] = fp->rate_table[i];
if (rate_min > fp->rate_table[i])
rate_min = fp->rate_table[i];
if (rate_max < fp->rate_table[i])
rate_max = fp->rate_table[i];
rates |= snd_pcm_rate_to_rate_bit(fp->rate_table[i]);
}
}
if (!nr_rates) {
@ -503,9 +497,6 @@ static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip,
kfree(fp->rate_table);
fp->rate_table = table;
fp->nr_rates = nr_rates;
fp->rate_min = rate_min;
fp->rate_max = rate_max;
fp->rates = rates;
return 0;
}
@ -602,6 +593,10 @@ static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,
parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
ret = validate_sample_rate_table_v2v3(chip, fp, clock);
if (ret < 0)
goto err_free;
set_rate_table_min_max(fp);
err_free:
kfree(data);