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authorTakashi Iwai <tiwai@suse.de>2009-02-16 22:48:12 +0100
committerTakashi Iwai <tiwai@suse.de>2009-02-16 22:48:12 +0100
commit0412558c873f716efe902b397af0653a550f7341 (patch)
treef7c775e4c156fd0ef127833798af3fd70c9d8987 /sound
parente156ac4c571e3be741bc411e58820b74a9295c72 (diff)
ALSA: usb-audio - Fix non-continuous rate detection
The detection of non-continuous rates (given via rate tables) isn't processed properly (e.g. for type II). This patch fixes and simplifies the detection code. Tested-by: Joris van Rantwijk <jorispubl@xs4all.nl> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/usb/usbaudio.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 2ab83129d9b..80863093d2c 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -2524,7 +2524,6 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform
* build the rate table and bitmap flags
*/
int r, idx;
- unsigned int nonzero_rates = 0;
fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
if (fp->rate_table == NULL) {
@@ -2532,24 +2531,26 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform
return -1;
}
- fp->nr_rates = nr_rates;
- fp->rate_min = fp->rate_max = combine_triple(&fmt[8]);
+ 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)
+ continue;
/* C-Media CM6501 mislabels its 96 kHz altsetting */
if (rate == 48000 && nr_rates == 1 &&
chip->usb_id == USB_ID(0x0d8c, 0x0201) &&
fp->altsetting == 5 && fp->maxpacksize == 392)
rate = 96000;
- fp->rate_table[r] = rate;
- nonzero_rates |= rate;
- if (rate < fp->rate_min)
+ fp->rate_table[fp->nr_rates] = rate;
+ if (!fp->rate_min || rate < fp->rate_min)
fp->rate_min = rate;
- else if (rate > fp->rate_max)
+ if (!fp->rate_max || rate > fp->rate_max)
fp->rate_max = rate;
fp->rates |= snd_pcm_rate_to_rate_bit(rate);
+ fp->nr_rates++;
}
- if (!nonzero_rates) {
+ if (!fp->nr_rates) {
hwc_debug("All rates were zero. Skipping format!\n");
return -1;
}