Provided by: roc-toolkit-tools_0.3.0+dfsg-7ubuntu2_amd64 
NAME
roc-send - send real-time audio
SYNOPSIS
roc-send OPTIONS
DESCRIPTION
Read audio stream from an audio device or file and send it to remote receiver.
Options
-h, --help
Print help and exit
-V, --version
Print version and exit
-v, --verbose
Increase verbosity level (may be used multiple times)
-L, --list-supported
list supported schemes and formats
-i,--input=IO_URI
Input file or device URI
--input-format=FILE_FORMAT
Force input file format
-s,--source=ENDPOINT_URI
Remote source endpoint
-r,--repair=ENDPOINT_URI
Remote repair endpoint
-c,--control=ENDPOINT_URI
Remote control endpoint
--reuseaddr
enable SO_REUSEADDR when binding sockets
--io-latency=STRING
Recording target latency, TIME units
--nbsrc=INT
Number of source packets in FEC block
--nbrpr=INT
Number of repair packets in FEC block
--packet-length=STRING
Outgoing packet length, TIME units
--packet-limit=INT
Maximum packet size, in bytes
--frame-limit=INT
Maximum internal frame size, in bytes
--frame-length=TIME
Duration of the internal frames, TIME units
--rate=INT
Override input sample rate, Hz
--resampler-backend=ENUM
Resampler backend (possible values="default", "builtin", "speex", "speexdec"
default=`default')
--resampler-profile=ENUM
Resampler profile (possible values="low", "medium", "high" default=`medium')
--interleaving
Enable packet interleaving (default=off)
--profiling
Enable self profiling (default=off)
--color=ENUM
Set colored logging mode for stderr output (possible values="auto", "always",
"never" default=`auto')
Endpoint URI
--source, --repair, and --control options define network endpoints to which to send the
traffic.
ENDPOINT_URI should have the following form:
protocol://host[:port][/path][?query]
Examples:
• rtsp://localhost:123/path?query
• rtp+rs8m://localhost:123
• rtp://127.0.0.1:123
• rtp://[::1]:123
• rtcp://10.9.8.3:123
The list of supported protocols can be retrieved using --list-supported option.
The host field should be either FQDN (domain name), or IPv4 address, or IPv6 address in
square brackets.
The port field can be omitted if the protocol defines standard port. Otherwise, it is
mandatory.
The path and query fields are allowed only for protocols that support them, e.g. for RTSP.
If FEC is enabled, a pair of a source and repair endpoints should be provided. The two
endpoints should use compatible protocols, e.g. rtp+rs8m:// for source endpoint, and
rs8m:// for repair endpoint. If FEC is disabled, a single source endpoint should be
provided.
Supported source and repair protocols:
• source rtp://, repair none (bare RTP without FEC)
• source rtp+rs8m://, repair rs8m:// (RTP with Reed-Solomon FEC)
• source rtp+ldpc://, repair ldpc:// (RTP with LDPC-Staircase FEC)
In addition, it is recommended to provide control endpoint. It is used to exchange
non-media information used to identify session, carry feedback, etc. If no control
endpoint is provided, session operates in reduced fallback mode, which may be less robust
and may not support all features.
Supported control protocols:
• rtcp://
IO URI
--input option requires a device or file URI in one of the following forms:
• DEVICE_TYPE://DEVICE_NAME -- audio device
• DEVICE_TYPE://default -- default audio device for given device type
• file:///ABS/PATH -- absolute file path
• file://localhost/ABS/PATH -- absolute file path (alternative form; only "localhost" host
is supported)
• file:/ABS/PATH -- absolute file path (alternative form)
• file:REL/PATH -- relative file path
• file://- -- stdin
• file:- -- stdin (alternative form)
Examples:
• pulse://default
• pulse://alsa_input.pci-0000_00_1f.3.analog-stereo
• alsa://hw:1,0
• file:///home/user/test.wav
• file://localhost/home/user/test.wav
• file:/home/user/test.wav
• file:./test.wav
• file:-
The list of supported schemes and file formats can be retrieved using --list-supported
option.
If the --input is omitted, the default driver and device are selected.
The --input-format option can be used to force the input file format. If it is omitted,
the file format is auto-detected. This option is always required when the input is stdin.
The path component of the provided URI is percent-decoded. For convenience, unencoded
characters are allowed as well, except that % should be always encoded as %25.
For example, the file named /foo/bar%/[baz] may be specified using either of the following
URIs: file:///foo%2Fbar%25%2F%5Bbaz%5D and file:///foo/bar%25/[baz].
Multiple slots
Multiple sets of endpoints can be specified to send media to multiple addresses.
Such endpoint sets are called slots. All slots should have the same set of endpoint types
(source, repair, etc) and should use the same protocols for them.
SO_REUSEADDR
If --reuseaddr option is provided, SO_REUSEADDR socket option will be enabled for all
sockets.
For TCP, it allows immediately reusing recently closed socket in TIME_WAIT state, which
may be useful you want to be able to restart server quickly.
For UDP, it allows multiple processes to bind to the same address, which may be useful if
you're using systemd socket activation.
Regardless of the option, SO_REUSEADDR is always disabled when binding to ephemeral port.
Time units
TIME should have one of the following forms:
123ns, 123us, 123ms, 123s, 123m, 123h
EXAMPLES
Endpoint examples
Send file to receiver with one bare RTP endpoint:
$ roc-send -vv -i file:./input.wav -s rtp://192.168.0.3:10001
Send file to receiver with IPv4 source, repair, and control endpoints:
$ roc-send -vv -i file:./input.wav -s rtp+rs8m://192.168.0.3:10001 \
-r rs8m://192.168.0.3:10002 -c rtcp://192.168.0.3:10003
Send file to receiver with IPv6 source, repair, and control endpoints:
$ roc-send -vv -i file:./input.wav -s rtp+rs8m://[2001:db8::]:10001 \
-r rs8m://[2001:db8::]:10002 -r rtcp://[2001:db8::]:10003
Send file to two receivers, each with three endpoints:
$ roc-send -vv \
-i file:./input.wav \
-s rtp+rs8m://192.168.0.3:10001 -r rs8m://192.168.0.3:10002 \
-c rtcp://192.168.0.3:10003 \
-s rtp+rs8m://198.214.0.7:10001 -r rs8m://198.214.0.7:10002 \
-c rtcp://198.214.0.7:10003
I/O examples
Capture sound from the default device (omit -i):
$ roc-send -vv -s rtp://192.168.0.3:10001
Capture sound from the default ALSA device:
$ roc-send -vv -s rtp://192.168.0.3:10001 -i alsa://default
Capture sound from a specific PulseAudio device:
$ roc-send -vv -s rtp://192.168.0.3:10001 -i pulse://alsa_input.pci-0000_00_1f.3.analog-stereo
Send WAV file (guess format by extension):
$ roc-send -vv -s rtp://192.168.0.3:10001 -i file:./input.wav
Send WAV file (specify format manually):
$ roc-send -vv -s rtp://192.168.0.3:10001 -i file:./input.file --input-format wav
Send WAV from stdin:
$ roc-send -vv -s rtp://192.168.0.3:10001 -i file:- --input-format wav <./input.wav
Send WAV file (specify absolute path):
$ roc-send -vv -s rtp://192.168.0.3:10001 -i file:///home/user/input.wav
Tuning examples
Force a specific rate on the input device:
$ roc-send -vv -s rtp://192.168.0.3:10001 --rate=44100
Select the LDPC-Staircase FEC scheme and a larger block size:
$ roc-send -vv -i file:./input.wav -s rtp+ldpc://192.168.0.3:10001 \
-r ldpc://192.168.0.3:10002 -c ldpc://192.168.0.3:10003 \
--nbsrc=1000 --nbrpr=500
Select lower packet length:
$ roc-send -vv -i file:./input.wav -s rtp+ldpc://192.168.0.3:10001 \
--packet-length 2500us
Select lower I/O latency and frame length:
$ roc-send -vv -s rtp://192.168.0.3:10001 \
--io-latency=20ms --frame-length 4ms
Manually specify resampling parameters:
$ roc-send -vv -s rtp://192.168.0.3:10001 \
--resampler-backend=speex --resampler-profile=high
SEE ALSO
roc-recv(1), and the Roc web site at https://roc-streaming.org/
BUGS
Please report any bugs found via GitHub (https://github.com/roc-streaming/roc-toolkit/).
AUTHORS
See authors page on the website for a list of maintainers and contributors.
COPYRIGHT
2023, Roc Streaming authors