DANTE AVIO USB cannot playback daemon source L24@48Khz 2/8 channels with 1ms frame size about aes67-linux-daemon HOT 5 CLOSED

The 4.4ms average latency problem is related to the following daemon parameter:
"tic_frame_size_at_1fs": 192
This setting specifies the PTP TIC frame size used by the driver that affects the period of driver base timer.
With a value of 192 samples the driver base timer is set to 4ms and outgoing RTP packets are sent to the network interface every 4ms causing the 4,4ms average latency observed.
By changing the daemon parameter to the following value in daemon.conf
"tic_frame_size_at_1fs": 48
the driver base timer is set to 1ms and the DANTE AVIO USB reports the following measurements:

The attempt to record the source using Dante AVIO USB is now successfull and returns a correct audio file.
With a tic_frame_size_at_1fs of 192 samples a user is able to configure Sources at 48Khz with a max number of samples ranging from 125μs (6 samples) to 4ms (192 samples). These sources will be affected by a 4ms latency.
With a tic_frame_size_at_1fs of 48 samples a user is able to configure sources at 48Khz with a max number of samples ranging from 125μs (6 samples) to 1ms (48 samples) and these will be affected by a 1ms latency.
The tic_frame_size_at_1fs daemon parameter can also be set to lower values (16, 12, 6) but this might affect the stability.

from aes67-linux-daemon.

To simplify the daemon configuration I improved the handling of tic_frame_size_at_1fs daemon parameter, added the possibility to configure it with the WebUI and updated the documentation.
The new daemon default for the tic_frame_size_at_1fs parameter is now set to 48 (1 ms).
See 745fa05

from aes67-linux-daemon.

After installing the Ubuntu 19.10 distro directly on my x86 PC, an Intel [email protected] (no Virtual Machines), I could produce a fully complaint 8 channels RTP stream at L24@48KHz.
This PC has a Realtek PCIe Gibabit ethenet NIC connected to a Gigabit Ethernet port of a Netgear GS108 switch.

The picture below shows the Wireshark RTP stream analysis:

The pictures below show the EBU List tool stream analysis:

from aes67-linux-daemon.

I further improved the WebUI to allow the configuration of the tic_frame_size_at_1fs daemon parameter to 6, 12, 18, 24, 48, 96 and 192 samples and to automatically compute the allowed Sources max frames per packet and the resulting frame duration. See 07c2b35.
Note: Using the PC and OS described above I couldn't achieve a stable driver configuration with a tic_frame_size_at_1fs of 6 samples.

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I just got confirmation that DANTE AVIO USB can properly playback 2 and 8 channels of a daemon Source configured with sample rate of 48 Khz and 1 ms frame duration.

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