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AES67 Daemon

AES67 daemon uses the Merging Technologies device driver (MergingRavennaALSA.ko) to implement basic AES67 functionalities. See ALSA RAVENNA/AES67 Driver README for additional information.

The daemon is responsible for:

  • communication and configuration of the ALSA RAVENNA/AES67 device driver
  • control and configuration of up to 64 sources and sinks using the ALSA RAVENNA/AES67 driver via netlink
  • session handling and SDP parsing and creation
  • HTTP REST API for the daemon control and configuration
  • SAP sources discovery and advertisement compatible with AES67 standard
  • mDNS sources discovery and advertisement (using Linux Avahi) compatible with Ravenna standard
  • RTSP client and server to retrieve, return and update SDP files via DESCRIBE and ANNOUNCE methods according to Ravenna standard
  • IGMP handling for SAP, PTP and RTP sessions

Configuration file

The daemon uses a JSON file to store the configuration parameters.
The config file must be specified at startup time and it gets updated when new params are set via the REST interface.
See JSON config params for additional info on the configuration parameters.
If a status file is specified in the daemon's configuration the server will load it at startup ad will save it at termination.
The status file contains all the configured sources and sinks (streams).
See JSON streams for additional info on the status file format and its parameters.

HTTP REST API

The daemon implements a REST API interface to configure and control the driver.
All operations returns HTTP 200 status code in case of success and HTTP 4xx or 5xx status code in case of failure.
In case of failure the server returns a text/plain content type with the category and a description of the error occurred.
NOTE: At present the embedded HTTP server doesn't implement neither HTTPS nor user authentication.

Get Daemon Configuration

  • URL /api/config
  • Method GET
  • URL Params none
  • Body Type application/json
  • Body Config params

Set Daemon Configuration

  • URL /api/config
  • Method POST
  • URL Params none
  • Body Type application/json
  • Body Config params

Get PTP Configuration

  • URL /api/ptp/config
  • Method GET
  • URL Params none
  • Body Type application/json
  • Body PTP Config params

Set PTP Configuration

  • URL /api/ptp/config
  • Method POST
  • URL Params none
  • Body Type application/json
  • Body PTP Config params

Get PTP Status

  • URL /api/ptp/status
  • Method GET
  • URL Params none
  • Body Type application/json
  • Body PTP Status params

Add RTP Source

  • Description add or update the RTP source specified by the id
  • URL /api/source/:id
  • Method PUT
  • URL Params id=[integer in the range (0-63)]
  • Body Type application/json
  • Body RTP Source params

Remove RTP Source

  • Description remove the RTP sink specified by the id
  • URL /api/source/:id
  • Method DELETE
  • URL Params id=[integer in the range (0-63)]
  • Body none

Get RTP Source SDP file

  • Description retrieve the SDP of the source specified by id
  • URL /api/source/sdp/:id
  • Method GET
  • URL Params id=[integer in the range (0-63)]
  • Body Type application/sdp
  • Body Example SDP file for a source

Add RTP Sink

  • Description add or update the RTP sink specified by the id
  • URL /api/sink/:id
  • Method PUT
  • URL Params id=[integer in the range (0-63)]
  • Body Type application/json
  • Body RTP Sink params

Remove RTP Sink

  • Description remove the RTP sink specified by id
  • URL /api/sink/:id
  • Method DELETE
  • URL Params id=[integer in the range (0-63)]
  • Body none

Get RTP Sink status

  • Description retrieve the status of the sink specified by id
  • URL /api/sink/status/:id
  • Method GET
  • URL Params id=[integer in the range (0-63)]
  • Body Type application/json
  • Body RTP Sink status params

Get all configured RTP Sources

  • URL /api/sources
  • Method GET
  • URL Params none
  • Body type application/json
  • Body RTP Sources params

Get all configured RTP Sinks

  • URL /api/sinks
  • Method GET
  • URL Params none
  • Body type application/json
  • Body RTP Sinks params

Get all configured RTP Sources and Sinks (Streams)

  • URL /api/streams
  • Method GET
  • URL Params none
  • Body type application/json
  • Body RTP Streams params

Get remote RTP Sources

  • Description retrieve the remote sources collected via SAP, via mDNS or both
  • URL /api/browse/sources/[all|mdns|sap]
  • Method GET
  • URL Params all=[all sources], mdns=[mDNS sources only], sap=[sap sources only]
  • Body type application/json
  • Body RTP Remote Sources params

HTTP REST API structures

JSON Config

Example

{
  "interface_name": "lo",
  "http_port": 8080,
  "rtsp_port": 8854,
  "log_severity": 2,
  "syslog_proto": "none",
  "syslog_server": "255.255.255.254:1234",
  "rtp_mcast_base": "239.2.0.1",
  "status_file": "./status.json",
  "rtp_port": "5004",
  "ptp_domain": 0,
  "ptp_dscp": 46,
  "playout_delay": 0,
  "frame_size_at_1fs": 192,
  "sample_rate": 44100,
  "max_tic_frame_size": 1024,
  "sap_mcast_addr": "239.255.255.255",
  "sap_interval": 30,
  "mac_addr": "01:00:5e:01:00:01",
  "ip_addr": "127.0.0.1",
  "node_id": "AES67 daemon ubuntu-d9aca383"
}

where:

interface_name JSON string specifying the network interface used by the daemon and the driver for both the RTP, PTP, SAP and HTTP traffic.

http_port JSON number specifying the HTTP port number used by the web server in the daemon implementing the REST interface.

rtsp_port JSON number specifying the RTSP port number used by the RTSP server in the daemon.

log_severity JSON integer specifying the process log severity level (0 to 5).
All traces major or equal to the specified level are enabled. (0=trace, 1=debug, 2=info, 3=warning, 4=error, 5=fatal).

syslog_proto JSON string specifying the syslog protocol used for logging.
This can be an empty string to log to the local syslog, "udp" to send syslog messages to a remote server or "none" to disable the syslog logging. When "none" is used the client writes the logs to the standard output.

syslog_server JSON string specifying the syslog server address used for logging.

status_file JSON string specifying the file that will contain the sessions status.
The file is loaded when the daemon starts and is saved when the daemon exits.

rtp_mcast_base JSON string specifying the default base RTP IPv4 multicast address used by a source.
The specific multicast RTP address is the base address plus the source id number.
For example if the base address is 239.2.0.1 and source id is 1 the RTP source address used is 239.2.0.2.

rtp_port JSON number specifying the RTP port used by the sources.

ptp_domain JSON number specifying the PTP clock domain of the master clock the driver will attempt to synchronize to.

ptp_dscp JSON number specifying the IP DSCP used in IPv4 header for PTP traffic. Valid values are 48 (CS6) and 46 (EF).

sample_rate JSON number specifying the default sample rate. Valid values are 44100Hz, 48000Hz and 96000Hz.

playout_delay JSON number specifying the default safety playout delay at 1FS in samples.

tic_frame_size_at_1fs JSON number specifying the TIC frame size at 1FS in samples, valid range is from 6 to 192 samples. This global setting is used to determine the driver base timer period. For example with a value of 192 samples this period is set to 4ms and the outgoing RTP packets are scheduled for being sent every 4ms resulting on an average latency greater than 4ms.

max_tic_frame_size JSON number specifying the max tick frame size. This is currently set to 1024.

sap_mcast_addr JSON string specifying the SAP multicast address used for both announcing local sources and browsing remote sources.
By default and according to SAP RFC this address is 224.2.127.254, but many devices use 239.255.255.255.

sap_interval JSON number specifying the SAP interval in seconds to use. Use 0 for automatic and RFC compliant interval. Default is 30secs.

mac_addr JSON string specifying the MAC address of the specified network device. NOTE: This parameter is read-only and cannot be set. The server will determine the MAC address of the network device at startup time.

ip_addr JSON string specifying the IP address of the specified network device. NOTE: This parameter is read-only and cannot be set. The server will determine the IP address of the network device at startup time and will monitor it periodically.

mdns_enabled JSON boolean specifying whether the mDNS discovery is enabled or disabled.

node_id JSON string specifying the unique node identifier used to identify mDNS, SAP and SDP services announced by the daemon. NOTE: This parameter is read-only and cannot be set. The server will determine the node id at startup time.

JSON PTP Config

Example

{
  "domain": 0,
  "dscp": 46
}

where:

domain JSON number specifying the PTP clock domain of the master clock the driver will attempt to synchronize to.

dscp JSON number specifying the IP DSCP used in IPv4 header for PTP traffic.
Valid values are 48 (CS6) and 46 (EF).

JSON PTP Status

Example

{
  "status": "unlocked",
  "gmid": "00-00-00-FF-FE-00-00-00",
  "jitter": 0
}

where:

status JSON string specifying the PTP slave status. This can be unlocked, locking or locked.

gmid JSON string specifying GrandMaster clock ID we are currently synchronized to.

jitter JSON number specifying the measured PTP packet delay jitter.

JSON RTP source

Example:

{
  "enabled": true,
  "name": "ALSA Source 0",
  "io": "Audio Device",
  "codec": "L16",
  "max_samples_per_packet": 48,
  "ttl": 15,
  "payload_type": 98,
  "dscp": 34,
  "refclk_ptp_traceable": true,
  "map": [0, 1]
}

where:

enabled JSON bool specifying whether the source is enabled and will be announced or not.

name JSON string specifying the source name.

io JSON string specifying the IO name.

codec JSON string specifying codec in use. Valid values are L16, L24 and AM824 (L32).

max_sample_per_packet JSON number specifying the max number of samples contained in one RTP packet.
Valid values are 12, 16, 48, 96, 192.
See the table below for correspondent max RTP packet duration:

44.1Khz 48Khz 96Khz
12 272µs 250µs 125µs
16 363µs 333µs 166µs
48 1.088ms 1ms 500µs
96 2.177ms 2ms 1ms
192 4.353ms 4ms 2ms

ttl JSON number specifying RTP packets Time To Live.

payload_type JSON number specifying RTP Payload Type.

dscp JSON number specifying the IP DSCP used in IPv4 header for RTP traffic. Valid values are 46 (EF), 34 (AF41), 26 (AF31), 0 (BE).

refclk_ptp_traceable JSON boolean specifying whether the PTP reference clock is traceable or not. A reference clock source is traceable if it is known to be delivering traceable time.

map JSON array of integers specifying the mapping between the RTP source and the ALSA playback device channels used during playback. The length of this map determines the number of channels of the source.

RTP source SDP

Example:

v=0
o=- 0 0 IN IP4 127.0.0.1
s=ALSA Source 0
c=IN IP4 239.1.0.1/15
t=0 0
a=clock-domain:PTPv2 0
m=audio 5004 RTP/AVP 98
c=IN IP4 239.1.0.1/15
a=rtpmap:98 L16/44100/2
a=sync-time:0
a=framecount:48
a=ptime:1.08843537415
a=mediaclk:direct=0
a=ts-refclk:ptp=traceable
a=recvonly

JSON RTP sink

Example:

{
  "name": "ALSA Sink 0",
  "io": "Audio Device",
  "delay": 576,
  "use_sdp": false,
  "source": "http://127.0.0.1:8080/api/source/sdp/0",
  "sdp": "v=0\no=- 0 0 IN IP4 127.0.0.1\ns=ALSA Source 0\nc=IN IP4 239.1.0.1/15\nt=0 0\na=clock-domain:PTPv2 0\nm=audio 5004 RTP/AVP 98\nc=IN IP4 239.1.0.1/15\na=rtpmap:98 L16/44100/2\na=sync-time:0\na=framecount:48\na=ptime:1.08843537415\na=mediaclk:direct=0\na=ts-refclk:ptp=traceable\na=recvonly\n",
  "ignore_refclk_gmid": false,
  "map": [0, 1]
}

where:

name JSON string specifying the source name.

io JSON string specifying the IO name.

delay JSON number specifying the playout delay of the sink in samples.
NOTE: The specified delay cannot be less than the source max samples size announced by the SDP file.

use_sdp JSON boolean specifying whether the source SDP file is fetched from the HTTP URL specified in the source parameter or the SDP in the sdp parameter is used.

source JSON string specifying the URL of the source SDP file. At present HTTP and RTSP protocols are supported. This parameter is mandatory if use_sdp is false.

sdp JSON string specifying the SDP of the source. This parameter is mandatory if use_sdp is true. See example SDP file for a source

ignore_refclk_gmid JSON boolean specifying whether the grand master reference clock ID specified in the SDP file of the source must be compared with the master reference clock to which the current PTP slave clock is syncronized.

map JSON array of integers specifying the mapping between the RTP sink and the ALSA capture device channels used during recording. The length of this map determines the number of channels of the sink.

JSON RTP sink status

Example:

{   
  "sink_flags":
  { 
    "rtp_seq_id_error": false, 
    "rtp_ssrc_error": false, 
    "rtp_payload_type_error": false, 
    "rtp_sac_error": false, 
    "receiving_rtp_packet": false, 
    "some_muted": false, 
    "all_muted": false, 
    "muted": true
  },
  "sink_min_time": 0

}

where:

sink_flags JSON object containing a set of flags reporting the RTP sink status.

  • rtp_seq_id_error JSON boolean specifying whether a wrong RTP sequence was detected.
  • rtp_ssrc_error JSON boolean specifying whether a wrong RTP source is contributing to the incoming stream.
  • rtp_payload_type_error JSON boolean specifying whether a wrong payload type was received.
  • rtp_sac_error JSON boolean specifying whether a packet with a wrong RTP timestamp was received.
  • receiving_rtp_packet JSON boolean specifying whether the sink is currently receiving RTP packets from the source.
  • some_muted JSON boolean (not used)
  • all_muted JSON boolean (not used)
  • muted JSON boolean specifying whether the sink is currently muted.

sink_min_time JSON number specifying the minimum source RTP packet arrival time.

JSON RTP Sources

Example:

{
  "sources": [
  {
    "id": 0,
    "enabled": true,
    "name": "ALSA Source 0",
    "io": "Audio Device",
    "max_samples_per_packet": 48,
    "codec": "L16",
    "ttl": 15,
    "payload_type": 98,
    "dscp": 34,
    "refclk_ptp_traceable": true,
    "map": [ 0, 1 ]
  }  ]

}

where:

sources JSON array of the configured sources. Every source is identified by the JSON number id (in the range 0 - 63). See RTP Source params for all the other parameters.

JSON RTP Sinks

Example:

{
  "sinks": [
  {
    "id": 0,
    "name": "ALSA Sink 0",
    "io": "Audio Device",
    "use_sdp": true,
    "source": "http://127.0.0.1:8080/api/source/sdp/0",
    "sdp": "v=0\no=- 0 0 IN IP4 127.0.0.1\ns=ALSA Source 0\nc=IN IP4 239.1.0.1/15\nt=0 0\na=clock-domain:PTPv2 0\nm=audio 5004 RTP/AVP 98\nc=IN IP4 239.1.0.1/15\na=rtpmap:98 L16/44100/2\na=sync-time:0\na=framecount:48\na=ptime:1.08843537415\na=mediaclk:direct=0\na=ts-refclk:ptp=traceable\na=recvonly\n",
    "delay": 576,
    "ignore_refclk_gmid": false,
    "map": [ 0, 1 ]
  }  ]

}

where:

sinks JSON array of the configured sinks. Every sink is identified by the JSON number id (in the range 0 - 63). See RTP Sink params for all the other parameters.

JSON RTP Streams

Example:

{
  "sources": [
  {
    "id": 0,
    "enabled": true,
    "name": "ALSA Source 0",
    "io": "Audio Device",
    "max_samples_per_packet": 48,
    "codec": "L16",
    "ttl": 15,
    "payload_type": 98,
    "dscp": 34,
    "refclk_ptp_traceable": true,
    "map": [ 0, 1 ]
  }  ],
  "sinks": [
  {
    "id": 0,
    "name": "ALSA Sink 0",
    "io": "Audio Device",
    "use_sdp": true,
    "source": "http://127.0.0.1:8080/api/source/sdp/0",
    "sdp": "v=0\no=- 0 0 IN IP4 127.0.0.1\ns=ALSA Source 0\nc=IN IP4 239.1.0.1/15\nt=0 0\na=clock-domain:PTPv2 0\nm=audio 5004 RTP/AVP 98\nc=IN IP4 239.1.0.1/15\na=rtpmap:98 L16/44100/2\na=sync-time:0\na=framecount:48\na=ptime:1.08843537415\na=mediaclk:direct=0\na=ts-refclk:ptp=traceable\na=recvonly\n",
    "delay": 576,
    "ignore_refclk_gmid": false,
    "map": [ 0, 1 ]
  }  ]
}

where:

sources JSON array of the configured sources. Every source is identified by the JSON number id (in the range 0 - 63). See RTP Source params for all the other parameters.

sinks JSON array of the configured sinks. Every sink is identified by the JSON number id (in the range 0 - 63). See RTP Sink params for all the other parameters.

JSON Remote Sources

Example:

{
  "remote_sources": [
  {
    "source": "SAP",
    "id": "d00000a611d",
    "name": "ALSA Source 2",
    "domain": "",
    "address": "10.0.0.13",
    "sdp": "v=0\no=- 2 0 IN IP4 10.0.0.13\ns=ALSA Source 2\nc=IN IP4 239.1.0.3/15\nt=0 0\na=clock-domain:PTPv2 0\nm=audio 5004 RTP/AVP 98\nc=IN IP4 239.1.0.3/15\na=rtpmap:98 L16/48000/2\na=sync-time:0\na=framecount:48\na=ptime:1\na=mediaclk:direct=0\na=ts-refclk:ptp=IEEE1588-2008:00-10-4B-FF-FE-7A-87-FC:0\na=recvonly\n",
    "last_seen": 2768,
    "announce_period": 30 
  }, 
  {
    "source": "SAP",
    "id": "d00000a8dd5",
    "name": "ALSA Source 1",
    "domain": "",
    "address": "10.0.0.13",
    "sdp": "v=0\no=- 1 0 IN IP4 10.0.0.13\ns=ALSA Source 1\nc=IN IP4 239.1.0.2/15\nt=0 0\na=clock-domain:PTPv2 0\nm=audio 5004 RTP/AVP 98\nc=IN IP4 239.1.0.2/15\na=rtpmap:98 L16/48000/2\na=sync-time:0\na=framecount:48\na=ptime:1\na=mediaclk:direct=0\na=ts-refclk:ptp=IEEE1588-2008:00-10-4B-FF-FE-7A-87-FC:0\na=recvonly\n",
    "last_seen": 2768,
    "announce_period": 30 
  }  ]
}

where:

remote_sources JSON array of the remote sources collected so far. Every source is identified by the unique JSON string id.

source JSON string specifying the protocol used to collect the remote source.

id JSON string specifying the remote source unique id.

name JSON string specifying the remote source name announced.

doamin JSON string specifying the remote source domain announced. NOTE: This field is only populated for mDNS sources.

address JSON string specifying the remote source address announced.

sdp JSON string specifying the remote source SDP.

last_seen JSON number specifying the last time the source was announced. This time is expressed in seconds since the daemon startup.

announce_period JSON number specifying the meausured period in seconds between the last source announcements. A remote source is automatically removed if it doesn't get announced for announce_period x 10 seconds.