> On Tue, Oct 29, 2013 at 04:11:38PM -0800, Roger wrote:
>> 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
NOTE: I've renamed the ttable transformation profile for reducing front left
and front right channels to myHDMIX within my asounrc file.
A little more testing shows two channel stereo mixes using the transformation
table as expected, and I do hear the reduced front left and front right
channels when setting the values to other decimal values such as 0.1 to 0.9.
And, this problem of treating 0.9 (or any decimal value below 1.0) as 0 occurs
when playing back PCM 5.1 wav streams and not two channel stereo streams!
The below execution definitely displays output of both front left and front
right channels being completely omitted from playback when using any decimal
value within ttable. Setting the channels to 1 or even "1.0", the channel(s)
can obviously be heard. Also, ALSA is apparently properly storing the proper
decimal (ie. 0.9 or 1.0) value within it's variables.
$ aplay-hdmi -v -D myHDMIX
Music/Led_Zeppelin/Celegration_Day/PCM51-24bit/01.Good_Times_Bad_Times.wav
Playing WAVE
'Music/Led_Zeppelin/Celegration_Day/PCM51-24bit/01.Good_Times_Bad_Times.wav' :
Signed 24 bit Little Endian in 3bytes, Rate 48000 Hz, Channels 6
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 : S24_3LE
subformat : STD
channels : 6
rate : 48000
exact rate : 48000 (48000/1)
msbits : 24
buffer_size : 24000
period_size : 6000
period_time : 125000
tstamp_mode : NONE
period_step : 1
avail_min : 6000
period_event : 0
start_threshold : 24000
stop_threshold : 24000
silence_threshold: 0
silence_size : 0
boundary : 6755399441055744000
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 : 48000
exact rate : 48000 (48000/1)
msbits : 32
buffer_size : 24000
period_size : 6000
period_time : 125000
tstamp_mode : NONE
period_step : 1
avail_min : 6000
period_event : 0
start_threshold : 24000
stop_threshold : 24000
silence_threshold: 0
silence_size : 0
boundary : 6755399441055744000
appl_ptr : 0
hw_ptr : 0
--
Roger
http://rogerx.freeshell.org/
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