Daniel Yek wrote:
OK. So, your system is using the default ALSA setting of 48000Hz.
speaker-test -c2 --device default --rate 44100
no output.
I can hear the pink noise on my system. This indicates that the
"default" PCM device setting might not be routed through "plug" (and/or
"dmix") in driver configuration file for your sound card.
"default" is typical routed through "plug" and can play in any format,
but I know that ALSA's configurations from the drivers are often too
difficult to predict.
i'm pretty sure "default" is routed through "dmix" based upon our
/etc/asound.conf file. for reference, here's the snd_card and dmix
definitions from our asound.conf:
pcm.snd_card {
type hw
card 0
}
# Allow mixing of multiple output streams to this device
pcm.dmixer {
type dmix
ipc_key 1024
slave {
pcm "snd_card"
# This stuff provides some fixes for latency issues.
# buffer_size should be set for your audio chipset.
period_time 0
period_size 1024
buffer_size 32768
}
bindings {
0 0
1 1
}
}
for some reason, it seems like "dmix" doesn't like 44.1kHz. if i run:
speaker-test -c2 --device pcm.dmixer --rate 48000
i get output. if i change the rate to 44100, i get the following errors
spit out to stderr:
[EMAIL PROTECTED] etc]# speaker-test -c2 --device pcm.dmixer --rate 44100
speaker-test 1.0.11rc4
Playback device is pcm.dmixer
Stream parameters are 44100Hz, S16_LE, 2 channels
Using 16 octaves of pink noise
Rate 44100Hz not available for playback: Invalid argument
Setting of hwparams failed: Invalid argument
.
.
.
note - if i run "speaker-test" using --device pcm.snd_card, both 44.1
and 48 work.
So, AlsaVaryingSampleRate=1 worked.
We know that the system "default" PCM is set to 48000Hz and that Helix
can play with some other sampling rate, but somehow, not 48000Hz. That
is somewhat contradicting...
What is the sampling rate that the clips is playing with?
the clips are run of the mill MP3 files, samplerate = 44.1kHz.
Is it possible that for some reason helix isn't attempting to play at
48000Hz? You can set break point in _CheckFormat() to find out if
48000Hz is ever attempted.
audio/device/platform/unix/audlinux_alsa.cpp:
CAudioOutLinuxAlsa::_CheckFormat()
...
if (uPrefSampleRateNoDefault) // You can set breakpoint
here.
{
// The "old" way of handling sample rate test.
err = snd_pcm_hw_params_test_rate (m_pAlsaPCMHandle,
hwparams, sample_rate, 0);
if (err < 0)
{
wLastError = RA_AOE_BADFORMAT;
}
}
else
{
// Use ALSA's default.
if (sample_rate != 48000) wLastError = RA_AOE_BADFORMAT;
}
if i set the breakpoint where you indicated ( line 1884 ), sample_rate
is set to 44100 independent of the setting of 'uPrefSampleRateNoDefault'.
If you could turn on Unified Logging
(https://common.helixcommunity.org/2005/devdocs/UnifiedLogging), it
would be even easier to find out -- you would find log statement in
hxlog.txt in helix source code "root" directory.
with AlsaVaryingSampleRate set to '1', here's the relevant section of
the log file ( with timestamps removed ):
ADEV CHXAudioSession[0x8081c00]::Setup()
ADEV CHXAudioSession[0x8081c00]::CreateAudioDevice()
ADEV CHXAudioSession[0x8081c00]::CreateAudioDevice(): created [0x80a9418]
ADEV _OpenAudio() while checking format!
ADEV Opening ALSA PCM device, default, to check format!
ADEV Closing ALSA PCM device after check format!
ADEV CHXAudioSession[0x8081c00]::OpenDevice()
ADEV CHXAudioSession[0x8081c00]::TryOpenAudio()
ADEV CHXAudioSession[0x8081c00]::ReleaseAudioDevice()
ADEV ERROR: Closing ALSA PCM device, but the device is not opened!
ADEV CHXAudioSession[0x8081c00]::RestoreReplacedDevice()
ADEV CHXAudioSession[0x8081c00]::CreateAudioDevice()
ADEV CHXAudioSession[0x8081c00]::CreateAudioDevice(): created [0x80b6460]
ADEV _OpenAudio() outside _CheckFormat()!
ADEV Opening ALSA PCM device, default, for actual use!
ADEV Requested a buffering time of 500000, got a time of 682653
ADEV Requested a period time of 170663, got a period of 21333
ADEV Device Configured:
ADEV Sample Rate: 44100
ADEV Sample Width: 2
ADEV Num channels: 2
ADEV Block size: 8800
ADEV Device buffer size: 120420
ADEV Supports HW Pause: 0
ADEV Start threshold: 30080
ADEV CHXAudioSession[0x8081c00]::TryOpenAudio(): open succeeded;
pausing audio device (default state)
with AlsaVaryingSampleRate set to '0', here's the relevant section of
the log file ( with timestamps removed ):
ADEV CHXAudioSession[0x8081c00]::Setup()
ADEV CHXAudioSession[0x8081c00]::CreateAudioDevice()
ADEV CHXAudioSession[0x8081c00]::CreateAudioDevice(): created [0x80a9418]
ADEV _OpenAudio() while checking format!
ADEV Opening ALSA PCM device, default, to check format!
ADEV Closing ALSA PCM device after check format!
ADEV _OpenAudio() while checking format!
ADEV Opening ALSA PCM device, default, to check format!
ADEV Closing ALSA PCM device after check format!
ADEV _OpenAudio() while checking format!
ADEV Opening ALSA PCM device, default, to check format!
ADEV Closing ALSA PCM device after check format!
ADEV _OpenAudio() while checking format!
ADEV Opening ALSA PCM device, default, to check format!
ADEV Closing ALSA PCM device after check format!
ADEV _OpenAudio() while checking format!
ADEV Opening ALSA PCM device, default, to check format!
ADEV Closing ALSA PCM device after check format!
ADEV _OpenAudio() while checking format!
ADEV Opening ALSA PCM device, default, to check format!
ADEV Closing ALSA PCM device after check format!
ADEV CHXAudioSession[0x8081c00]::OpenDevice()
ADEV CHXAudioSession[0x8081c00]::TryOpenAudio()
ADEV CHXAudioSession[0x8081c00]::ReleaseAudioDevice()
ADEV ERROR: Closing ALSA PCM device, but the device is not opened!
ADEV CHXAudioSession[0x8081c00]::RestoreReplacedDevice()
ADEV CHXAudioSession[0x8081c00]::CreateAudioDevice()
ADEV CHXAudioSession[0x8081c00]::CreateAudioDevice(): created [0x80a9418]
ADEV _OpenAudio() outside _CheckFormat()!
ADEV Opening ALSA PCM device, default, for actual use!
ADEV Requested a buffering time of 500000, got a time of 682666
ADEV Requested a period time of 170666, got a period of 21333
ADEV Device Configured:
ADEV Sample Rate: 48000
ADEV Sample Width: 2
ADEV Num channels: 2
ADEV Block size: 9600
ADEV Device buffer size: 131072
ADEV Supports HW Pause: 0
ADEV Start threshold: 31744
ADEV CHXAudioSession[0x8081c00]::TryOpenAudio(): open succeeded;
pausing audio device (default state)
i'm confused... with 'VaryingRate' enabled, it looks like Helix decides
to use 44.1kHz for playback and succeeds, however with 'VaryingRate' set
to '0', it tries to use 48kHz and no output happens. this seems to be
the opposite of what happens with speaker-test!
thanks again for your help!
ciao,
/tony
_______________________________________________
Audio-dev mailing list
[email protected]
http://lists.helixcommunity.org/mailman/listinfo/audio-dev
