Re: [Alsa-user] asoundrc ttable: integer only, no floating math?

[Roger <rog...@gm...>]

> On Tue, Oct 29, 2013 at 08:01:35AM +0100, Clemens Ladisch wrote:
>Roger wrote:
>> On Mon, Oct 28, 2013 at 12:53:34PM +0100, Clemens Ladisch wrote:
>>> Roger wrote:
>>>> Trying to reduce my left and right channels to 0.5, but am noticing ALSA is
>>>> only reading values specified as floating as "0".
>>>>
>>>> The below should reduce the volume slightly on channels left (0) and right (0),
>>>> but it's obvious I'm getting the channel set to zero (0) or off.
>>>>
>>>> pcm.myHDMI {
>>>>         type route slave {
>>>>             pcm "hw:1,7"
>>>>             format S32_LE
>>>>             channels 6 }
>>>>         ttable {
>>>>             0.0= 0.9
>>>>             1.1= 0.9
>>>>             2.4= 1
>>>>             3.5= 1
>>>>             4.2= 1
>>>>             5.3= 1
>>>>         }
>>>> }
>>>
>>> The ttable entries are floating-point numbers, except when alsa-lib was
>>> configured --with-softfloat.
>>
>> configure:12281: checking for softfloat
>> configure:12299: result: no
>
>What is the output of "aplay -v -D myHDMI something.wav"?


$ aplay-hdmi -v -D myHDMIX Music/Mozart/Essential_Mozart-1/01._Allegro_\(from_Eine_kleine_Nachtmusik\,_K525\).wav 
Playing WAVE 'Music/Mozart/Essential_Mozart-1/01._Allegro_(from_Eine_kleine_Nachtmusik,_K525).wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Route conversion PCM (sformat=S32_LE)
  Transformation table:
    0 <- 0*0.9
    1 <- 1*0.9
    2 <- 4
    3 <- 5
    4 <- 2
    5 <- 3
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 44100
  exact rate   : 44100 (44100/1)
  msbits       : 16
  buffer_size  : 22080
  period_size  : 5520
  period_time  : 125170
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 5520
  period_event : 0
  start_threshold  : 22080
  stop_threshold   : 22080
  silence_threshold: 0
  silence_size : 0
  boundary     : 6214967485771284480
Slave: Hardware PCM card 1 'HDA NVidia' device 7 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : S32_LE
  subformat    : STD
  channels     : 6
  rate         : 44100
  exact rate   : 44100 (44100/1)
  msbits       : 32
  buffer_size  : 22080
  period_size  : 5520
  period_time  : 125170
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 5520
  period_event : 0
  start_threshold  : 22080
  stop_threshold   : 22080
  silence_threshold: 0
  silence_size : 0
  boundary     : 6214967485771284480
  appl_ptr     : 0
  hw_ptr       : 0


-- 
Roger
http://rogerx.freeshell.org/