mirror of
https://gitlab.xiph.org/xiph/ezstream.git
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Catch up with the documentation
This commit is contained in:
Moritz Grimm
parent
4cffc5102d
commit
91b82d8fd5
@ -18,13 +18,12 @@
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.Sh SYNOPSIS
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.Nm
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.Bk -words
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.Op Fl hmnqVv
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.Op Fl hqrVv
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.Fl c Ar configfile
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.Ek
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.Nm
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.Bk -words
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.Fl s Ar playlistFile
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.Op Ar playlist
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.Fl s Ar file
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.Ek
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.Sh DESCRIPTION
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The
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@ -38,22 +37,25 @@ It can also use various external decoders and encoders to re-encode from one
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format to another, and stream the result.
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The only requirement is that the external programs support writing to or
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reading from standard input, and can be used from the command line.
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.Ss Command line parameters
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.Ss Command line arguments
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.Bl -tag -width Ds
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.It Fl c Ar configfile
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Use the XML configuration in
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.Ar configfile .
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.It Fl h
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Print a summary of available command line parameters with short descriptions
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Print a summary of available command line arguments with short descriptions
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and exit.
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.It Fl m
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Disable all metadata updates and keep existing metadata in streams untouched.
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.It Fl n
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Normalize metadata strings by removing excess whitespaces.
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.It Fl q
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Be more quiet.
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Suppress the output that external programs send to standard error.
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.It Fl s Ar playlist
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.It Fl r
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Maintain a line of real-time status information about the stream on standard
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output.
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.Po
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Implies
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.Fl q .
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.Pc
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.It Fl s Ar file
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Run
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.Nm
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as a line-based shuffling utility.
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@ -72,18 +74,9 @@ Print the
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.Nm
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version number and exit.
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.It Fl v
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Produce more verbose output from
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.Nm .
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Use twice for even more verbose output.
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Increase logging verbosity.
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May be used up to three times to also include debug logging output.
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.El
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.Pp
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When the
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.Fl q
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and
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.Fl v
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parameters are provided simultaneously, an additional line of information about
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the currently streamed file \(em playlist position, approximate playing time
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and bit rate \(em is displayed.
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.Ss Runtime control
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On POSIX systems,
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.Nm
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@ -122,7 +115,7 @@ configuration file.
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.Pp
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Each element in the configuration file consists of a
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.Em start tag ,
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its content and an
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its content, and an
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.Em end tag .
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For example:
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.Pp
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@ -140,323 +133,397 @@ like in the introductory example shown above.
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.It Sy \&<ezstream\ /\&>
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.Pq Mandatory.
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The configuration file's root element.
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It contains all other configuration elements.
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.El
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.Ss Global configuration elements
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Each of the global configuration elements have the
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.Li \&<ezstream/\&>
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element as their parent.
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.Bl -tag -width -Ds
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.It Sy \&<url\ /\&>
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.Pq Mandatory.
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Specifies the location and mount point of the Icecast server, to which the
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stream will be sent.
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The content must be of the form
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.Pa http://server:port/mountpoint
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For example:
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It contains all other configuration elements:
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.Pp
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.Dl \&<url\&>http://example.com:8000/stream.ogg\&</url\&>
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.It Sy \&<sourceuser\ /\&>
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.Pq Optional.
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Sets the source username for authentication with the Icecast server.
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The default user
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.Po
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usually
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.Dq Li source
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.Pc
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is used if this element is not provided.
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.It Sy \&<sourcepassword\ /\&>
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.El
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.Ss Server block
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.Bl -tag -width -Ds
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.It Sy \&<server\ /\&>
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.Pq Mandatory.
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Sets the source password for authentication with the Icecast server.
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This element contains the entire server configuration as child elements.
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Its parent is the
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.Sy \&<ezstream\ /\&>
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element.
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.El
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.Ss Server configuration
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.Bl -tag -width -Ds
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.It Sy \&<protocol\ /\&>
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Transport protocol used to stream to the server:
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.Pp
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.Bl -tag -width HTTPS -compact
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.It Ar HTTP
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Unencrypted HTTP (the default).
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.It Ar HTTPS
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HTTP over TLS.
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.El
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.It Sy \&<hostname\ /\&>
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.Pq Mandatory.
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The FQDN host name or IP address of the server.
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.It Sy \&<port\ /\&>
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Port number on which the server is listening.
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.Pp
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Default:
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.Ar 8000
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.It Sy \&<user\ /\&>
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User to authenticate as on the server.
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.Pp
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Default:
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.Ar source
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.It Sy \&<password\ /\&>
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.Pq Mandatory.
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Password to authenticate with on the server.
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.It Sy \&<ca_dir\ /\&>
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Directory in which OpenSSL finds root CA certificates for validating the
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.Ar HTTPS
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server identity.
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.Pp
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Default:
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.Em no server validation
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.It Sy \&<ca_file\ /\&>
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Path of a root CA bundle file for validating the
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.Ar HTTPS
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server identity.
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.Pp
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Default:
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.Em no server validation
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.It Sy \&<client_cert\ /\&>
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X.503 client certificate for authentication on an
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.Ar HTTPS
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server.
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.Pp
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Default:
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.Em no client certificate authentication
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.It Sy \&<client_key\ /\&>
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Private key that matches the public key and certificate in
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.Sy \&<client_cert\ /\&> .
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.Pp
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Default:
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.Em no client certificate authentication
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.It Sy \&<reconnect_attempts\ /\&>
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Number of reconnect attempts in case of connection issues with the server,
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or 0
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.Pq zero
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for trying indefinitely (the default).
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.El
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.Ss Stream block
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.Bl -tag -width -Ds
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.It Sy \&<stream\ /\&>
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.Pq Mandatory.
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This element contains the entire stream configuration as child elements.
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Its parent is the
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.Sy \&<ezstream\ /\&>
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element.
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.El
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.Ss Stream configuration
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.Bl -tag -width -Ds
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.It Sy \&<mountpoint\ /\&>
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.Pq Mandatory.
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Stream mountpoint on the server.
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.It Sy \&<name\ /\&>
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Informational name of the broadcast.
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.Pp
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Default:
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.Em none
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.It Sy \&<url\ /\&>
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Informational URL associated with the broadcast, e.g. the web site.
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.Pp
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Default:
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.Em none
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.It Sy \&<genre\ /\&>
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Informational genre of the broadcast.
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.Pp
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Default:
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.Em none
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.It Sy \&<description\ /\&>
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Informational description of the broadcast.
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.Pp
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Default:
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.Em none
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.It Sy \&<quality\ /\&>
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Informational quality setting of the VBR broadcast.
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.Pp
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Default:
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.Em none
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.It Sy \&<bitrate\ /\&>
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Informational bitrate setting of the CBR broadcast.
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.Pp
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Default:
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.Em none
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.It Sy \&<samplerate\ /\&>
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Informational sample rate of the broadcast audio.
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.Pp
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Default:
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.Em none
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.It Sy \&<channels\ /\&>
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Informational number of audio channels of the broadcast.
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.Pp
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Default:
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.Em none
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.It Sy \&<server_public\ /\&>
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Boolean setting of whether the broadcast may be listed in a public YP
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directory, or not.
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.Pp
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.Bl -tag -width 0|NO|FALSE -compact
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.It Ar 0|No|False
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The broadcast is private (the default).
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.It Ar 1|Yes|True
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The broadcast is public.
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.El
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.It Sy \&<format\ /\&>
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.Pq Mandatory.
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This element has two different meanings, depending on whether re-encoding is
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enabled or not.
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It specifies the
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.Em output format
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of the stream if re-encoding is enabled.
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Otherwise, it specifies the
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.Em input format
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of
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.Sy all
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input files.
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Recognized and supported values for output stream formats are
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.Sy VORBIS ,
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.Sy MP3
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and
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.Sy THEORA .
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Other values will be ignored and cause
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.Nm
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to simply pass through the data, which may or may not work.
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.It Sy \&<filename\ /\&>
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.Pq Mandatory.
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Set the path and name of a single media file, a playlist, the name of an
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external program
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.Pq see below ,
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or the keyword
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.Pa stdin
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for streaming from standard input.
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Playlists are recognized by their filename extension and end with either
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.Em .m3u
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or
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.Em .txt .
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The stream format.
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.Pp
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A playlist consists of filenames, one entry per line.
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.Bl -tag -width VORBIS -compact
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.It Ar Vorbis
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Ogg Vorbis audio format
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.It Ar MP3
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MP3 audio format
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.It Ar Theora
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Ogg Theora video format
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.El
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.It Sy \&<encoder\ /\&>
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Set the encoder by its configured symbolic name
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.Pq see below ,
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which should be used to (re)encode the stream.
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Not configuring an encoder makes
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.Nm
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stream input media files as-is.
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.Pp
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The configured encoder's output stream format must match what is configured
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in
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.Sy \&<format\ /\&> .
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.El
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.Ss Media block
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.Bl -tag -width -Ds
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.It Sy \&<media\ /\&>
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.Pq Mandatory.
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This element contains the entire input media configuration as child elements.
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Its parent is the
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.Sy \&<ezstream\ /\&>
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element.
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.El
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.Ss Media configuration
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.Bl -tag -width -Ds
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.It Sy \&<type\ /\&>
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Configure the input media type:
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.Pp
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.Bl -tag -width AUTODETECT -compact
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.It Ar autodetect
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Attempt to autodetect, whether the input is a playlist, or a single media
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file.
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Playlists are detected by their
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.Dq Li .m3u
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and
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.Dq Li .txt
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file name extensions.
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.Pq This is the default.
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.It Ar file
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The input is one single media file.
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.It Ar playlist
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The input is a playlist.
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Playlists are a newline-delimited list of media file path names.
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Comments in playlists are introduced by a
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.Sq Li #
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sign at the beginning of a line and ignored by
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.Nm .
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.It Sy \&<playlist_program\ /\&>
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.Pq Optional.
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Set to
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.Sy 1
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.Pq one
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to indicate that the file in
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.Li \&<filename/\&>
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is actually an executable program or script.
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If set to
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.Sy 0
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.Pq zero ,
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.Li \&<filename/\&>
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content is assumed to be a media file, playlist file or the keyword
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.Pa stdin
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.Pq the default .
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.Pp
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See the
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.Sy SCRIPTING
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section for details on how the playlist program must behave.
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.It Ar program
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The input is an executable
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.Dq Playlist Program .
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See
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.Xr SCRIPTING
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for more information.
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.It Ar stdin
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The input is read from standard input.
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.El
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.It Sy \&<filename\ /\&>
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The input media file name; mandatory for all but the
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.Ar stdin
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type.
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.It Sy \&<shuffle\ /\&>
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.Pq Optional.
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Set to
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.Sy 1
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.Pq one
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to randomly shuffle the entries of the playlist specified in
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.Li \&<filename/\&> .
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Files are played sequentially if set to
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.Sy 0
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.Pq zero
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or when the
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.Li \&<shuffle/\&>
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element is absent.
|
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This option will be ignored if
|
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.Li \&<playlist_program/\&>
|
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is set to 1
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.Pq one.
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.It Sy \&<metadata_progname\ /\&>
|
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.Pq Optional.
|
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Set the path and name of an executable program or script that should be used by
|
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Boolean setting of whether the
|
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.Ar playlist
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type media should be shuffled, or not.
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.Pp
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.Bl -tag -width 0|NO|FALSE -compact
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.It Ar 0|No|False
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Stream the playlist content sequentially (the default).
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.It Ar 1|Yes|True
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Shuffle the playlist prior to streaming its content.
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.El
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.It Sy \&<stream_once\ /\&>
|
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Boolean setting of whether
|
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.Nm
|
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to set the metadata of the stream.
|
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The program is automatically queried when a new track is streamed, or whenever
|
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the
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should exit after streaming its media input, or start over.
|
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.Pp
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.Bl -tag -width 0|NO|FALSE -compact
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.It Ar 0|No|False
|
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Attempt to start over whenever the end of the media input is reached (the
|
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default).
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.It Ar 1|Yes|True
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After streaming all media input, exit.
|
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.El
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.El
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.Ss Metadata block
|
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.Bl -tag -width -Ds
|
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.It Sy \&<metadata\ /\&>
|
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.Pq Mandatory.
|
||||
This element contains the entire metadata configuration as child elements.
|
||||
Its parent is the
|
||||
.Sy \&<ezstream\ /\&>
|
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element.
|
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.El
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.Ss Metadata configuration
|
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.Bl -tag -width -Ds
|
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.It Sy \&<program\ /\&>
|
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Set an executable
|
||||
.Dq Metadata Program
|
||||
to be queried for all metadata on
|
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.Sy SIGUSR2
|
||||
signal is received.
|
||||
or whenever a new track begins.
|
||||
See
|
||||
.Xr SCRIPTING
|
||||
for more information.
|
||||
.Pp
|
||||
If the
|
||||
.Li \&<metadata_progname/\&>
|
||||
element is present in the configuration, no attempts will be made to read
|
||||
metadata from files that are being streamed.
|
||||
If this behavior is not desired, it should be removed or commented out in the
|
||||
configuration file.
|
||||
.Pp
|
||||
See the
|
||||
.Sy SCRIPTING
|
||||
section for details on how the metadata program must behave.
|
||||
.It Sy \&<metadata_format\ /\&>
|
||||
.Pq Optional.
|
||||
Default:
|
||||
.Em use metadata as contained in media files
|
||||
.It Sy \&<format_str\ /\&>
|
||||
Set the format of the string that should be used for the
|
||||
.Sq Li @M@
|
||||
placeholder when setting metadata with an external program or script via
|
||||
.Li \&<metadata_progname/\&> .
|
||||
placeholder, when quering for metadata from an executable.
|
||||
.Pp
|
||||
See the
|
||||
.Sy METADATA
|
||||
section for details on how metadata is handled by
|
||||
.Nm .
|
||||
.It Sy \&<metadata_refreshinterval\ /\&>
|
||||
.Pq Optional.
|
||||
Configures the time
|
||||
Default:
|
||||
.Em Li @A@ - @T@
|
||||
.It Sy \&<refresh_interval\ /\&>
|
||||
Configure a time interval for additional metadata updates via a
|
||||
.Dq Metadata Program :
|
||||
.Pp
|
||||
.Bl -tag -width -1 -compact
|
||||
.It Ar -1
|
||||
Do not trigger any additional metadata updates (the default).
|
||||
.It Ar 0
|
||||
Trigger metadata updates at the highest reasonable frequency.
|
||||
.It Ar \&>0
|
||||
Configure the time
|
||||
.Pq in seconds
|
||||
inbetween additional metadata updates via
|
||||
.Li \&<metadata_progname/\&> .
|
||||
A value of 0
|
||||
.Pq zero
|
||||
triggers updates as fast as possible, while a value of \&-1
|
||||
.Pq minus one
|
||||
or the absence of this configuration element disables this feature.
|
||||
.It Sy \&<stream_once\ /\&>
|
||||
Set to
|
||||
.Sy 1
|
||||
.Pq one
|
||||
in order to stream the content of
|
||||
.Li \&<filename/\&>
|
||||
only once, and to
|
||||
.Sy 0
|
||||
.Pq zero
|
||||
for continuous streaming
|
||||
.Pq the default .
|
||||
.It Sy \&<reconnect_tries\ /\&>
|
||||
Set how many attempts should be made to reconnect to the Icecast server in case
|
||||
the connection is interrupted.
|
||||
The default is to try indefinitely, which is equal to setting this
|
||||
configuration option to
|
||||
.Sy 0
|
||||
.Pq zero .
|
||||
.It Sy \&<svrinfoname\ /\&>
|
||||
.Pq Optional.
|
||||
Set the name of the broadcast.
|
||||
Informational only.
|
||||
.It Sy \&<svrinfourl\ /\&>
|
||||
.Pq Optional.
|
||||
Set the URL of the web site associated with the broadcast.
|
||||
Informational only.
|
||||
.It Sy \&<svrinfogenre\ /\&>
|
||||
.Pq Optional.
|
||||
Set the genre of the broadcast.
|
||||
Informational only, used for YP.
|
||||
.It Sy \&<svrinfodescription\ /\&>
|
||||
.Pq Optional.
|
||||
Set the description of the broadcast.
|
||||
Informational only, used for YP.
|
||||
.It Sy \&<svrinfobitrate\ /\&>
|
||||
.Pq Optional.
|
||||
Set the bit rate of the broadcast.
|
||||
This setting is also purely informational and only used for YP.
|
||||
The value is set by the user and not
|
||||
.Nm ,
|
||||
and should match the bit rate of the stream.
|
||||
.It Sy \&<svrinfoquality\ /\&>
|
||||
.Pq Optional.
|
||||
Set the quality setting of an Ogg Vorbis broadcast.
|
||||
Informational only and needs to be set by the user, used for YP.
|
||||
.It Sy \&<svrinfochannels\ /\&>
|
||||
.Pq Optional.
|
||||
Set the number of audio channels in the broadcast, e.g.
|
||||
.Sy 1
|
||||
.Pq one
|
||||
for mono or
|
||||
.Sy 2
|
||||
for stereo.
|
||||
Informational only and needs to be set by the user, used for YP.
|
||||
.It Sy \&<svrinfosamplerate\ /\&>
|
||||
.Pq Optional.
|
||||
Set the sample rate of the broadcast.
|
||||
Informational only and needs to be set by the user, used for YP.
|
||||
.It Sy \&<svrinfopublic\ /\&>
|
||||
.Pq Optional.
|
||||
Set to
|
||||
.Sy 1
|
||||
.Pq one
|
||||
if the broadcast may be listed in a public YP directory.
|
||||
If set to
|
||||
.Sy 0
|
||||
.Pq zero ,
|
||||
the Icecast server will not submit this stream to a YP directory, which is also
|
||||
the default if the
|
||||
.Li \&<svrinfopublic/\&>
|
||||
element is absent.
|
||||
.It Sy \&<reencode\ /\&>
|
||||
.Pq Optional.
|
||||
Element that contains child elements, which specify if and how re-encoding
|
||||
should be done.
|
||||
in between additional metadata updates.
|
||||
.El
|
||||
.Ss Re-encoding settings
|
||||
Each of the re-encoding configuration elements have the
|
||||
.Li \&<reencode/\&>
|
||||
element as their parent.
|
||||
.It Sy \&<normalize_strings\ /\&>
|
||||
Boolean setting of whether metadata strings should have excess whitespace
|
||||
removed, or not.
|
||||
.Pp
|
||||
.Bl -tag -width 0|NO|FALSE -compact
|
||||
.It Ar 0|No|False
|
||||
Use metadata strings as-is (the default).
|
||||
.It Ar 1|Yes|True
|
||||
Trim leading and trailing whitespace, as well as remove excess whitespace
|
||||
in case that there is more than one in sequence.
|
||||
.El
|
||||
.It Sy \&<no_updates\ /\&>
|
||||
Boolean setting of whether metadata updates should be suppressed altogether,
|
||||
or not.
|
||||
.Pp
|
||||
.Bl -tag -width 0|NO|FALSE -compact
|
||||
.It Ar 0|No|False
|
||||
Update metadata in the usual manner (the default).
|
||||
.It Ar 1|Yes|True
|
||||
Disable all metadata updates, and keep existing metadata in streams untouched.
|
||||
.El
|
||||
.El
|
||||
.Ss Decoders block
|
||||
.Bl -tag -width -Ds
|
||||
.It Sy \&<enable\ /\&>
|
||||
Set to
|
||||
.Sy 1
|
||||
.Pq one
|
||||
to enable re-encoding.
|
||||
If set to
|
||||
.Sy 0
|
||||
.Pq zero ,
|
||||
no re-encoding will be done, which is also the default if the
|
||||
.Li \&<enable/\&>
|
||||
element is absent.
|
||||
.It Sy \&<encdec\ /\&>
|
||||
Element that contains child elements, which specify how to decode and encode
|
||||
a certain media file format for streaming.
|
||||
Each format is described by a separate
|
||||
.Li \&<encdec/\&>
|
||||
.It Sy \&<decoders\ /\&>
|
||||
This element contains all decoder blocks as child elements.
|
||||
Its parent is the
|
||||
.Sy \&<ezstream\ /\&>
|
||||
element.
|
||||
.El
|
||||
.Ss Decoder/Encoder settings
|
||||
Each of the decoder/encoder configuration elements have the
|
||||
.Li \&<encdec/\&>
|
||||
element as their parent.
|
||||
.Ss Decoder block
|
||||
.Bl -tag -width -Ds
|
||||
.It Sy \&<decoder\ /\&>
|
||||
This element contains all configuration of a single decoder.
|
||||
Its parent is the
|
||||
.Sy \&<decoders\ /\&>
|
||||
element.
|
||||
.Pp
|
||||
Many decoders can be configured, but a filename extension can only be
|
||||
associated with one decoder.
|
||||
.El
|
||||
.Ss Decoder configuration
|
||||
.Bl -tag -width -Ds
|
||||
.It Sy \&<name\ /\&>
|
||||
Set the name of the decoder configuration.
|
||||
Choosing a meaningful, unique name is beneficial for logging and debugging.
|
||||
.Pp
|
||||
Default:
|
||||
.Em autoincrementing index
|
||||
.It Sy \&<program\ /\&>
|
||||
.Pq Mandatory.
|
||||
Set the full command line to decode a media input file, represented by the
|
||||
.Sq @T@
|
||||
placeholder, into a
|
||||
.Dq canonical internal format
|
||||
on standard output.
|
||||
.Pp
|
||||
The canonical format should be the same for all configured decoders, e.g. RAW
|
||||
audio with a specific signedness, bitrate, and samplerate that can be
|
||||
consumed by encoders.
|
||||
.Pp
|
||||
For exotic use cases, metadata placeholders may be used here.
|
||||
.Pp
|
||||
Example:
|
||||
.Dl \&<program\&>oggdec -R -o - @T@\&</program\&>
|
||||
.It Sy \&<file_ext\ /\&>
|
||||
.Pq Mandatory.
|
||||
Set a filename extension to be associated with this decoder.
|
||||
.Pp
|
||||
It is possible to specify more than one
|
||||
.Sy \&<file_ext\ /\&>
|
||||
element per decoder to associate more than one file extension to the same
|
||||
decoder.
|
||||
.El
|
||||
.Ss Encoders block
|
||||
.Bl -tag -width -Ds
|
||||
.It Sy \&<encoders\ /\&>
|
||||
This element contains all encoder blocks as child elements.
|
||||
Its parent is the
|
||||
.Sy \&<ezstream\ /\&>
|
||||
element.
|
||||
.El
|
||||
.Ss Encoder block
|
||||
.Bl -tag -width -Ds
|
||||
.It Sy \&<encoder\ /\&>
|
||||
This element contains all configuration of a single encoder.
|
||||
Its parent is the
|
||||
.Sy \&<encoders\ /\&>
|
||||
element.
|
||||
.Pp
|
||||
Many encoders can be configured.
|
||||
.El
|
||||
.Ss Encoder configuration
|
||||
.Bl -tag -width -Ds
|
||||
.It Sy \&<name\ /\&>
|
||||
.Pq Mandatory.
|
||||
Set the name of the encoder configuration, to be referenced in the
|
||||
.Sy \&<stream\ /\&>
|
||||
block in case (re)encoding is desired.
|
||||
.Pp
|
||||
The name is case-aware, but not case-sensitive.
|
||||
.It Sy \&<format\ /\&>
|
||||
This element is used by
|
||||
.Nm
|
||||
to find the appropriate encoder for the output stream format specified in the
|
||||
.Li \&<format/\&>
|
||||
element inside the global configuration.
|
||||
For consistency reasons, it is recommended that this element is always
|
||||
supplied, even for currently unsupported output formats, with content such as
|
||||
.Sy VORBIS ,
|
||||
.Sy MP3 ,
|
||||
.Sy THEORA ,
|
||||
.Sy FLAC ,
|
||||
et cetera.
|
||||
.It Sy \&<match\ /\&>
|
||||
Set the filename extension used to identify a given media file format.
|
||||
This allows
|
||||
.Nm
|
||||
to find the appropriate decoder for a given file.
|
||||
Should be set to
|
||||
.Em .mp3
|
||||
for MP3,
|
||||
.Em .flac
|
||||
for FLAC,
|
||||
.Em .ogg
|
||||
for Ogg Vorbis, and so on.
|
||||
.It Sy \&<decode\ /\&>
|
||||
Set the command to decode the specified media file format to raw data and send
|
||||
it to standard output.
|
||||
During runtime, the placeholder
|
||||
.Sq Li @T@
|
||||
is replaced with the name of the media file, as it is specified in the
|
||||
.Li \&<filename/\&>
|
||||
element or contained in a playlist file.
|
||||
It should always be enclosed in quotes, to prevent problems with filenames that
|
||||
contain whitespaces.
|
||||
.Pq Mandatory.
|
||||
Stream format produced by this encoder.
|
||||
This must be one of the available stream formats as specified for the
|
||||
.Sy \&<stream\ /\&>
|
||||
block.
|
||||
.It Sy \&<program\ /\&>
|
||||
.Pq Mandatory.
|
||||
Set the full command line to encode
|
||||
.Dq canonical internal format
|
||||
from standard input into a supported stream format on standard output.
|
||||
.Pp
|
||||
Metadata placeholders can be used in the
|
||||
.Li \&<decode/\&>
|
||||
element as well, for combined de-/encoder programs that produce data that can
|
||||
be streamed.
|
||||
See the
|
||||
.Sy METADATA
|
||||
section for details on how metadata is handled by
|
||||
.Nm .
|
||||
Metadata placeholders may be used here.
|
||||
.Pp
|
||||
For example, to decode Ogg Vorbis files using the
|
||||
.Cm oggdec
|
||||
utility:
|
||||
.Pp
|
||||
.Dl \&<decode\&>oggdec -R -o - @T@\&</decode\&>
|
||||
.It Sy \&<encode\ /\&>
|
||||
Set the command to encode raw data, received from standard input, to the
|
||||
specified stream format.
|
||||
.Pp
|
||||
Metadata placeholders can be used in the
|
||||
.Li \&<encode/\&>
|
||||
element.
|
||||
For details about using metadata in
|
||||
.Nm ,
|
||||
see below in the
|
||||
.Sy METADATA
|
||||
section.
|
||||
.Pp
|
||||
For example, to encode an Ogg Vorbis stream using the quality setting 1.5 with
|
||||
the
|
||||
.Cm oggenc
|
||||
utility:
|
||||
.Pp
|
||||
.Dl \&<encode\&>oggenc -r -q 1.5 -t @M@ -\&</encode\&>
|
||||
Example:
|
||||
.Dl \&<program\&>oggenc -r -q 1.5 -t @M@ -\&</program\&>
|
||||
.El
|
||||
.Sh SCRIPTING
|
||||
The
|
||||
@ -493,17 +560,17 @@ option is enabled.
|
||||
The program must not return anything (just a newline character is okay) if it
|
||||
is called by
|
||||
.Nm
|
||||
with a command line parameter that the program does not support.
|
||||
with a command line argument that the program does not support.
|
||||
.It
|
||||
When called without command line parameters, the program should return a
|
||||
When called without command line arguments, the program should return a
|
||||
complete string that should be used for metadata.
|
||||
.It
|
||||
When called with the command line parameter
|
||||
When called with the command line argument
|
||||
.Qq Li artist ,
|
||||
the program should return only the artist information of the metadata.
|
||||
.Pq Optional.
|
||||
.It
|
||||
When called with the command line parameter
|
||||
When called with the command line argument
|
||||
.Qq Li title ,
|
||||
the program should return only the title information of the metadata.
|
||||
.Pq Optional.
|
||||
@ -517,50 +584,45 @@ is placeholders in decoder and encoder commands that are replaced with real
|
||||
content during runtime.
|
||||
.Pp
|
||||
.Em Note:
|
||||
To prevent malicious shell script in metadata
|
||||
.Pq such as artist and title tags
|
||||
from being executed, all metadata content is automatically enclosed in single
|
||||
quotes, with escaped single quote and backslash characters inbetween.
|
||||
To prevent this from causing unwanted side-effects
|
||||
.Pq or introducting security risk ,
|
||||
placeholders
|
||||
.Em must not
|
||||
be quoted any further.
|
||||
All placeholders are replaced with content enclosed in single quotes, with
|
||||
escaped single quote and backslash characters in between, so that
|
||||
interpretation by the shell does not occur.
|
||||
.Em Do not add any additional quoting!
|
||||
.Ss Metadata Placeholders
|
||||
.Bl -tag -width -Ds
|
||||
.It Sy @T@
|
||||
Replaced with the media file name.
|
||||
Required in
|
||||
.Li \&<decode/\&>
|
||||
and is available in
|
||||
.Li \&<metadata_format/\&> .
|
||||
.Li /ezstream/decoders/decoder/program .
|
||||
Available in
|
||||
.Li /ezstream/metadata/format_str .
|
||||
.It Sy @M@
|
||||
Replaced with a metadata string.
|
||||
See below for a detailed explanation.
|
||||
.Pq See below for a detailed explanation.
|
||||
Available in
|
||||
.Li \&<decode/\&>
|
||||
.Li /ezstream/decoders/decoder/program
|
||||
and
|
||||
.Li \&<encode/\&> .
|
||||
.Li /ezstream/encoders/encoder/program .
|
||||
.It Sy @a@
|
||||
Replaced with the artist information.
|
||||
Available in
|
||||
.Li \&<decode/\&> ,
|
||||
.Li \&<encode/\&>
|
||||
.Li /ezstream/decoders/decoder/program ,
|
||||
.Li /ezstream/encoders/encoder/program
|
||||
and
|
||||
.Li \&<metadata_format/\&> .
|
||||
.Li /ezstream/metadata/format_str .
|
||||
.It Sy @t@
|
||||
Replaced with the title information.
|
||||
Available in
|
||||
.Li \&<decode/\&> ,
|
||||
.Li \&<encode/\&>
|
||||
.Li /ezstream/decoders/decoder/program ,
|
||||
.Li /ezstream/encoders/encoder/program
|
||||
and
|
||||
.Li \&<metadata_format/\&> .
|
||||
.Li /ezstream/metadata/format_str .
|
||||
.It Sy @s@
|
||||
Replaced with the string returned by
|
||||
.Li \&<metadata_progname/\&>
|
||||
when called without any command line parameters.
|
||||
.Li /ezstream/metadata/program
|
||||
when called without any command line arguments.
|
||||
Available only in
|
||||
.Li \&<metadata_format/\&> .
|
||||
.Li /ezstream/metadata/format_str .
|
||||
.El
|
||||
.Ss The @M@ Placeholder
|
||||
While all other placeholders are simply replaced with whatever data they are
|
||||
@ -572,10 +634,10 @@ The logic used by
|
||||
is the following:
|
||||
.Bd -literal -offset indent
|
||||
If ('@M@ is present')
|
||||
If ('\&<metadata_progname/\&>' AND '\&<metadata_format/\&>')
|
||||
If (/ezstream/metadata/program AND /ezstream/metadata/format_str)
|
||||
Replace with format string result.
|
||||
Else
|
||||
If (NOT '\&<metadata_progname/\&>' AND '@t@ is present')
|
||||
If (NOT /ezstream/metadata/program AND '@t@ is present')
|
||||
Replace with empty string.
|
||||
else
|
||||
Replace with generated metadata string.
|
||||
@ -600,8 +662,7 @@ placeholders, external metadata programs and updates during runtime via
|
||||
.Sy SIGUSR2 .
|
||||
If things start to become just confusing, simplify.
|
||||
.Pp
|
||||
Metadata updates during runtime are done with a relatively broken feature of
|
||||
libshout.
|
||||
Metadata updates during runtime are done with a eccentric feature of libshout.
|
||||
Additional metadata information that is already present in the stream sent via
|
||||
.Nm
|
||||
is usually destroyed and replaced with the new data.
|
||||
@ -612,18 +673,18 @@ feature will continue to end up entirely in the
|
||||
.Qq Em Title
|
||||
field of a stream.
|
||||
.Pp
|
||||
Of all possible Ogg-based streams, only Ogg Vorbis can have its metadata
|
||||
manipulated by Icecast.
|
||||
Any attempt of
|
||||
.Nm
|
||||
to update other Ogg metadata is actually a no-op.
|
||||
Additional limitations in Icecast may apply as well, where one historic
|
||||
example is that of all possible Ogg-based streams, only Ogg Vorbis can have
|
||||
its metadata manipulated.
|
||||
.Pp
|
||||
While
|
||||
The ID3v1 tags
|
||||
.Pq relevant when streaming in MP3 format
|
||||
do not specify any character encoding, so
|
||||
.Nm
|
||||
tries to do its best with relaying metadata accurately to Icecast, and
|
||||
subsequently the listeners, different codesets and locales can pose a problem.
|
||||
Especially when streaming MP3 files, it may help to explicitly set a codeset
|
||||
to work with via the
|
||||
operates in a manner of
|
||||
.Dq best effort .
|
||||
In case of encoding issues, it may help to explicitly set a codeset to work
|
||||
with via the
|
||||
.Ev LC_CTYPE
|
||||
environment variable, as
|
||||
.Nm
|
||||
@ -632,7 +693,7 @@ Note that, even though support for different locales is provided by
|
||||
.Nm ,
|
||||
Icecast itself and the listening clients also have a say in the matter.
|
||||
The only way to ensure consistent results with metadata in non-Ogg streams is
|
||||
to use the characters available in the ISO-8859-1 codeset.
|
||||
to use only the characters available in the ISO-8859-1 codeset.
|
||||
.Pp
|
||||
External encoders may put additional, and possibly artificial, restrictions on
|
||||
valid characters in metadata.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user