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Softmixer controller for 4A (AGL Advance Audio Architecture).
------------------------------------------------------------
* Object: LUA API Documentation
* Status: In Progress
* Author: Fulup Ar Foll fulup@iot.bzh
* Date : April-2018
## Sound Cards
User may define as many sound card as needed. All sound cards will be group within one global multi channels card.
As a result, declaring three USB stereo sound card is equivalent to declare one Renesas GEN3 with 6 channels
```
-- Sound Card Definition
-- ==========================
-- local sndcard_sample = {
--
-- * Mandatory UID will be the ALSA PCM
-- ["uid"]= "YAMAHA-APU70",
--
-- * Mandatory Card might be found by either its devpath, its cardid or cardindex (should provide only one)
-- ["devpath"]= "/dev/snd/by-xxx/xxxx, (any path in /dev/snd pointing to a valid sndcard control works
-- ["cardid"] = "hw:xx", [xx] may either be a card index or a name (eg: hw:USB)
-- ["cardidx"] = N,
--
-- * Optional Device and subdev
-- ["device"] = N, (default 0)
-- ["subdev"] = N, (default 0)
--
-- * Mandotory List of sink channels attached to the card
-- ["sink"] = {
-- [0]= {["uid"]= "front-right", ["port"]= 0},
-- [1]= {["uid"]= "front-left", ["port"]= 1},
-- }
-- }
```
Sound card should be group in a table in order to request grouping as a multi channel PCM. Note that this grouping
relies on ALSA 'multi' plugin and thus inherit of its limits.
```
local sndcards= {
[0] = sndcard_0,
[1] = sndcard_2,
[3] = sndcard_3,
}
```
Call
```
error= L2C:snd_cards (source, sndcards)
if (error ~= 0) then
AFB:error (source, "--InLua-- L2C:sndcards fail to attach sndcards=%s", Dump_Table(sndcards))
--goto OnErrorExit
else
AFB:notice (source, "--InLua-- L2C:sndcards done response=%s", Dump_Table(response))
end
```
|
