Hi,
I'm continuing to investigate that issue and did some tests with aplay, using
the 5.1 wav file
that was used to create the AAC file with I had trouble with.
It turns out that aplay also mute or lower some channels and do not play 5.1
files well.
I check the available PCM with aplay and got the following result :
[code]bash-4.2$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=SB
HDA ATI SB, ALC889A Analog
Default Audio Device
sysdefault:CARD=SB
HDA ATI SB, ALC889A Analog
Default Audio Device
front:CARD=SB,DEV=0
HDA ATI SB, ALC889A Analog
Front speakers
surround40:CARD=SB,DEV=0
HDA ATI SB, ALC889A Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=SB,DEV=0
HDA ATI SB, ALC889A Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=SB,DEV=0
HDA ATI SB, ALC889A Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=SB,DEV=0
HDA ATI SB, ALC889A Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=SB,DEV=0
HDA ATI SB, ALC889A Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=SB,DEV=0
HDA ATI SB, ALC889A Digital
IEC958 (S/PDIF) Digital Audio Output
hdmi:CARD=HDMI,DEV=0
HDA ATI HDMI, HDMI 0
HDMI Audio Output[/code]
Using the default, I get sound but not properly downmixed :
bash-4.2$ aplay -v -D default ndj_5_1_MIX.wav
Lecture WAVE 'ndj_5_1_MIX.wav' : Signed 24 bit Little Endian in 3bytes,
Fréquence 48000 Hz,
6 Canaux
Plug PCM: Route conversion PCM (sformat=S32_LE)
Transformation table:
0 <- 0
1 <- 1
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 : 8192
period_size : 1024
period_time : 21333
tstamp_mode : NONE
period_step : 1
avail_min : 1024
period_event : 0
start_threshold : 8192
stop_threshold : 8192
silence_threshold: 0
silence_size : 0
boundary : 4611686018427387904
Slave: Soft volume PCM
Control: PCM Playback Volume
min_dB: -51
max_dB: 0
resolution: 256
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S32_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 32
buffer_size : 8192
period_size : 1024
period_time : 21333
tstamp_mode : NONE
period_step : 1
avail_min : 1024
period_event : 0
start_threshold : 8192
stop_threshold : 8192
silence_threshold: 0
silence_size : 0
boundary : 4611686018427387904
Slave: Direct Stream Mixing PCM
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S32_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 32
buffer_size : 8192
period_size : 1024
period_time : 21333
tstamp_mode : NONE
period_step : 1
avail_min : 1024
period_event : 0
start_threshold : 8192
stop_threshold : 8192
silence_threshold: 0
silence_size : 0
boundary : 4611686018427387904
Hardware PCM card 0 'HDA ATI SB' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S32_LE
subformat : STD------------------------------------------------------------------------------
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