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author | Daniel Mack <daniel@caiaq.de> | 2010-06-16 15:57:30 (GMT) |
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committer | Takashi Iwai <tiwai@suse.de> | 2010-06-23 14:09:50 (GMT) |
commit | 157a57b6fae7d3c6d24b7623dcc6679c6d244621 (patch) | |
tree | d4e803455aa7cbcab244355171be428a3b33fa47 /sound/usb/mixer.c | |
parent | 21af7d8c0c0a88f6f9fc6993d73001b4caf23b08 (diff) | |
download | linux-157a57b6fae7d3c6d24b7623dcc6679c6d244621.tar.xz |
ALSA: usb-audio: move and add some comments
Also add a list of open topics.
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/mixer.c')
-rw-r--r-- | sound/usb/mixer.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index ba54eb6..1163ec3 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -26,6 +26,22 @@ * */ +/* + * TODOs, for both the mixer and the streaming interfaces: + * + * - support for UAC2 effect units + * - support for graphical equalizers + * - RANGE and MEM set commands (UAC2) + * - RANGE and MEM interrupt dispatchers (UAC2) + * - audio channel clustering (UAC2) + * - audio sample rate converter units (UAC2) + * - proper handling of clock multipliers (UAC2) + * - dispatch clock change notifications (UAC2) + * - stop PCM streams which use a clock that became invalid + * - stop PCM streams which use a clock selector that has changed + * - parse available sample rates again when clock sources changed + */ + #include <linux/bitops.h> #include <linux/init.h> #include <linux/list.h> @@ -1199,14 +1215,6 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void } } else { /* UAC_VERSION_2 */ for (i = 0; i < 30/2; i++) { - /* From the USB Audio spec v2.0: - bmaControls() is a (ch+1)-element array of 4-byte bitmaps, - each containing a set of bit pairs. If a Control is present, - it must be Host readable. If a certain Control is not - present then the bit pair must be set to 0b00. - If a Control is present but read-only, the bit pair must be - set to 0b01. If a Control is also Host programmable, the bit - pair must be set to 0b11. The value 0b10 is not allowed. */ unsigned int ch_bits = 0; unsigned int ch_read_only = 0; |