On 09.02.2018 07:17, Shinnosuke Suzuki wrote:
Sorry, I didn't change the Subject.
Hi, Thank you for prompt reply.
> Can't you use a newer version? We are at 11.1 already and the
> bluetooth code has changed significantly.
I hope to do so, but I am developing on a embedded system (linux
kernel 3.10.49 Openwrt).
And I use BlueZ 5.30.
If pulseaudio 11.1 doesn't depend on kernel version, I would like to
install pulseaudio 11.1.
Does it any dependency on this?
PA 11.1 should work fine with your kernel and bluez version.
> When you record from the BT headset, the BT headset is set to HSP/HFP.
> This means that recording and playback stream are at 8kHz, not 16kHz.
> Pulseaudio only supports CVSD codec, not mSBC.
Thank you, I understand what codec pulseaudio uses.
So pulseaudio convert codec like this?
My app <- Linear 16bit 16kHz <- Pulseaudio <- CVSD codec ( 8kHz?)
<- Bluetooth Headset
My application want to use a Linear 16bit 16kHz because of a DSP spec.
From your point out, Do I have to set a sample format to PA_SAMPLE_U8?
If so, Do I have to convert voice packet which I get from callback
from 8kHz to 16kHz?
I thought pulseaudio do this.
yes, PA will do the re-sampling.
And I could get a voice data by 96byte per 10ms.
If stream is 8kHz, What codec could get in My app? PCM 8bit?
I couldn't understand why My app get 96byte per 10ms.
You should not expect to get a fixed number of bytes in a fixed time
interval. This is only true on average but not for a single callback. Are
the 96 bytes an average value?
If your application needs constant size data packets, you may have to
buffer some data.
Did you take a look at the pacat code to see how reading data from
a stream is done correctly?
>resample-method=trivial might result in bad audio quality.
I did set because CPU load is extremely high. I don't know why CPU
load is high.
So CPU load becomes low, I'll change configuration file.
Did you test other resample methods? There are quite a few available
and "trivial" is definitely the worst of them.
_______________________________________________
pulseaudio-discuss mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
