Liquidsoap

https://liquidsoap.readthedocs.io/en/stable/
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### Liquidsoap Installation Guide

Source: https://liquidsoap.readthedocs.io/en/stable/index

Provides instructions for installing Liquidsoap on various platforms. It covers installation via package managers like OPAM, system packages (Debian/Ubuntu), and building from source.

```shell
# Install using OPAM
opam install liquidsoap

# Install on Debian/Ubuntu
sudo apt-get update && sudo apt-get install liquidsoap

# Install from source
# (Refer to the official documentation for detailed steps)
```

--------------------------------

### Install Liquidsoap from Source

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

This guide covers compiling and installing Liquidsoap directly from its source code. It typically involves downloading the source, configuring, compiling, and installing.

```shell
# Download the source code
# tar xzf liquidsoap-X.Y.Z.tar.gz
# cd liquidsoap-X.Y.Z

# Configure the build
# ./configure

# Compile the source code
# make

# Install Liquidsoap
# sudo make install
```

--------------------------------

### Liquidsoap Configuration and Customization

Source: https://liquidsoap.readthedocs.io/en/stable/content/encoding_formats

Covers Liquidsoap configuration variables, adding the liquidsoap binary to your system, and setting up custom paths. This section also includes a full example demonstrating a complete Liquidsoap setup.

```liquidsoap
# Configuration variables
# Adding liquidsoap binary
# Custom paths
# Full example
```

--------------------------------

### Liquidsoap Directory Structure Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/custom-path

Illustrates the typical file and directory layout for a Liquidsoap installation, including executable scripts, libraries, and configuration files.

```bash
./bin
./bin/liquidsoap
./camomile
./camomile/charmaps
(...)
./ld
./ld/libao.so.2
(...)
./libs
./libs/externals.liq
(...)
./log
./magic
./magic/magic.mime
./plugins
./run

```

--------------------------------

### Liquidsoap Cookbook Examples

Source: https://liquidsoap.readthedocs.io/en/stable/content/faq

A collection of practical examples and recipes for common Liquidsoap tasks, demonstrating various functionalities.

```liquidsoap
# Example: Simple radio automation
radio = playlist("playlist.m3u")
output.dummy(radio)
```

--------------------------------

### Liquidsoap Installation and Dependencies

Source: https://liquidsoap.readthedocs.io/en/stable/content/build

Details on installing Liquidsoap, including mandatory, recommended, optional, and runtime optional dependencies. It also covers installation via the configure script.

```liquidsoap
# Mandatory dependencies:
# Recommended dependencies:
# Optional dependencies:
# Runtime optional dependencies:
# Installing via configure
```

--------------------------------

### Install OCaml and Liquidsoap with OPAM

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

This snippet demonstrates the recommended installation of Liquidsoap using OPAM. It includes creating an OCaml switch, installing external dependencies, and then installing Liquidsoap and its core dependencies. It also shows how to install optional dependencies like Opus.

```bash
opam switch create 4.08.0
opam depext taglib mad lame vorbis cry samplerate liquidsoap
opam install taglib mad lame vorbis cry samplerate liquidsoap
opam depext opus
opam install opus
```

--------------------------------

### Liquidsoap Cookbook Examples

Source: https://liquidsoap.readthedocs.io/en/stable/index

A collection of practical examples from the Liquidsoap cookbook, demonstrating file operations, transcoding, scheduling, handling special events, server interaction, and stream dumping.

```liquidsoap
# Files
# Transcoding
# Re-encoding a file
# Scheduling
# Force a file/playlist to be played at least every XX minutes
# Handle special events: mix or switch
# Unix interface, dynamic requests
# Dynamic input with harbor
# Adding new commands
# Dump a stream into segmented files
# Manually dump a stream
# Transitions
# Alsa unbuffered output
```

--------------------------------

### Dynamic Playlist Creation and Management

Source: https://liquidsoap.readthedocs.io/en/stable/content/dynamic_sources

This example demonstrates how to dynamically create and destroy playlist sources in Liquidsoap. It registers telnet commands to start and stop playlists, allowing for runtime control of audio streams and their outputs. The code utilizes functional programming concepts for intricate logic and includes comments for clarity. It suggests using `output.dummy(blank())` if no other output is configured and mentions adapting the approach to integrate with existing outputs via `input.harbor`.

```liquidsoap
dynamic_playlist.start <uri>
  - Creates a new playlist source using the provided URI and outputs it to a fixed icecast output.

dynamic_playlist.stop <uri>
  - Destroys the playlist source associated with the given URI.
```

--------------------------------

### Liquidsoap Cookbook Examples

Source: https://liquidsoap.readthedocs.io/en/stable/content/cookbook

A collection of practical examples demonstrating various functionalities in Liquidsoap, such as file handling, transcoding, scheduling, event handling, and stream manipulation.

```liquidsoap
# Force a file/playlist to be played at least every XX minutes
# Example: Ensure 'my_track.mp3' plays at least once every 30 minutes
playlist("my_track.mp3").schedule(30*60)
```

```liquidsoap
# Handle special events: mix or switch
# Example: Mix in a jingle when a specific event occurs
request.event("play_jingle").connect(playlist("jingle.mp3"))
```

```liquidsoap
# Unix interface, dynamic requests
# Example: Expose a playlist via a Unix socket for dynamic control
server.tcpin("localhost", 8080).mount("/playlist")
```

```liquidsoap
# Dynamic input with harbor
# Example: Connect to a remote stream using harbor
input.harbor("http://example.com/stream")
```

```liquidsoap
# Adding new commands
# Example: Define a custom command to toggle a specific output
command.add("toggle_output", function() { output.dummy.toggle() })
```

```liquidsoap
# Dump a stream into segmented files
# Example: Save a stream to hourly segmented files
output.file("%Y-%m-%d-%H.mp3", stream.segment(3600))
```

```liquidsoap
# Manually dump a stream
# Example: Manually trigger a dump of the current stream to a file
request.event("dump_now").connect(output.file("manual_dump.mp3"))
```

```liquidsoap
# Switch-based transitions
# Example: Smoothly switch between two playlists
playlist("playlist1.m3u").transition(playlist("playlist2.m3u"))
```

```liquidsoap
# Cross-based transitions
# Example: Crossfade between two streams
stream.crossfade(playlist("stream1.mp3"), playlist("stream2.mp3"))
```

```liquidsoap
# Alsa unbuffered output
# Example: Output audio to ALSA device with minimal buffering
output.alsa(device="hw:0,0", buffer_size=0)
```

--------------------------------

### Liquidsoap Example: Complex Case Analysis

Source: https://liquidsoap.readthedocs.io/en/stable/content/complete_case

This example demonstrates a complex Liquidsoap script scenario. It includes playing different playlists throughout the day, handling user requests via the telnet server, inserting jingles between songs and at the start of each hour, relaying live shows, and setting up multiple outputs to Icecast in different formats. The explanation emphasizes a modular approach to script design and provides guidance on testing and modifying the example.

```liquidsoap
# This is a conceptual example and requires specific configuration for file names and intervals.
# The actual script would involve defining playlists, request handling, jingle insertion logic,
# live stream relay, and output configurations.

# Example structure (not runnable as-is):

# Define playlists for different times of the day
playlist_morning = playlist("morning.m3u")
playlist_afternoon = playlist("afternoon.m3u")
playlist_evening = playlist("evening.m3u")

# Define jingles
jingle_normal = sound("jingle_normal.ogg")
jingle_hourly = sound("jingle_hourly.ogg")

# Define live show source
stream_live = input.http("http://your-live-stream.com/live.ogg")

# Define outputs
out_icecast1 = output.icecast(%mp3, host="localhost", port=8000, password="hackme", mount="/stream1")
out_icecast2 = output.icecast(%aac, host="localhost", port=8000, password="hackme", mount="/stream2")

# Main logic combining sources and outputs
# This would involve switch, crossfade, and other operators to manage the streams
# For example, switching playlists based on time:
# when time("06:00") do playlist_morning end
# when time("12:00") do playlist_afternoon end
# when time("18:00") do playlist_evening end

# Inserting jingles:
# add_hook(after_song=function(song) {
#   if random() < 0.2 then jingle_normal else null
# })

# Mixing hourly jingle:
# add_hook(at_hour=function() {
#   crossfade(jingle_hourly, main_stream, duration=10)
# })

# Relaying live shows:
# when is_available(stream_live) do stream_live end

# Connect sources to outputs
# connect(main_stream, out_icecast1)
# connect(main_stream, out_icecast2)

# Example of starting a live show from soundcard input (requires ALSA setup):
# input.alsa(device="hw:0,0")

```

--------------------------------

### Liquidsoap Custom Path

Source: https://liquidsoap.readthedocs.io/en/stable/content/clocks

This section explains how to manage Liquidsoap's custom path, including adding the Liquidsoap binary to the system's PATH and understanding how configuration files are loaded. It also provides a full example of a custom path setup.

```liquidsoap
# Example: Adding a custom plugin directory
add_path("plugins", "/usr/local/lib/liquidsoap/plugins")

```

--------------------------------

### Liquidsoap Installation

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

Instructions for installing Liquidsoap on different operating systems, including using OPAM, Debian/Ubuntu packages, Windows, and compiling from source.

```bash
# Install using OPAM
opam install liquidsoap

# Install on Debian/Ubuntu
sudo apt-get update && sudo apt-get install liquidsoap

# Installing from source
# git clone git://github.com/savonet/liquidsoap.git
# cd liquidsoap
# ./autogen.sh
# ./configure
# make
# sudo make install

# Latest development version
# git clone git://github.com/savonet/liquidsoap.git
# cd liquidsoap
# ./autogen.sh
# ./configure --enable-dev-mode
# make
# sudo make install
```

--------------------------------

### Installing Liquidsoap from Source

Source: https://liquidsoap.readthedocs.io/en/stable/content/build

Instructions for installing Liquidsoap from source using the configure script. This method is intended for system administrators or package maintainers.

```bash
# Configure script for manual installation
./configure
make
sudo make install
```

--------------------------------

### Liquidsoap Harbor Usage Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/harbor

An example of how to define a Harbor source in Liquidsoap. It shows setting up the source with a specific mountpoint and implies the need for MP3 decoding support if using Shoutcast clients.

```liquidsoap
input.harbor("mountpoint")

```

--------------------------------

### HLS Output Configuration Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/hls_output

Example configuration for sending streams as HLS output using `output.file.hls`. This demonstrates setting up encoded streams, stream information for playlists, and persistence options.

```liquidsoap
set("log.file.level", "debug")
set("log.stdout.level", "debug")

# Define the streams to be encoded
streams = [
  ("stream1", "%ffmpeg")
]

# Define stream information for HLS playlists
streams_info = [
  ("stream1", (128000, "aac", "ts"))
]

# Configure HLS output
output.file.hls(
  "/mnt/stream/hls/",
  streams=streams,
  streams_info=streams_info,
  persist=true,
  persist_at="/mnt/stream/hls/persist",
  segments=5,
  segments_overhead=2
)
```

--------------------------------

### Installing Liquidsoap with opam

Source: https://liquidsoap.readthedocs.io/en/stable/content/build

Recommends using the opam package manager for installing Liquidsoap. Opam handles OCaml compiler, modules, and system dependencies.

```bash
# Recommended installation method using opam
opam install liquidsoap
```

--------------------------------

### Liquidsoap Advanced Techniques and Cookbook

Source: https://liquidsoap.readthedocs.io/en/stable/content/encoding_formats

Provides insights into advanced Liquidsoap techniques, including smart crossfading and a collection of practical examples in the cookbook. This section is useful for users looking to optimize their audio streaming setups.

```liquidsoap
# Smart crossfade
# Cookbook examples
```

--------------------------------

### Install Liquidsoap using OPAM

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

This section details the recommended method for installing Liquidsoap using the OPAM package manager. It assumes OPAM is already set up.

```shell
opam install liquidsoap
```

--------------------------------

### Liquidsoap Configuration and Custom Paths

Source: https://liquidsoap.readthedocs.io/en/stable/content/build

Information on configuring Liquidsoap, including adding the Liquidsoap binary to the path and understanding configuration variables. A full example is provided.

```liquidsoap
# Adding liquidsoap binary
# Configuration variables
# Full example
```

--------------------------------

### Liquidsoap Command-Line Tools for Settings and Plugins

Source: https://liquidsoap.readthedocs.io/en/stable/content/help

Provides examples of using the `liquidsoap` command-line interface to inspect configuration settings and list available plugins. These commands help in understanding and managing Liquidsoap's features.

```bash
liquidsoap --conf-descr
liquidsoap --conf-descr-key server
liquidsoap --list-plugins
liquidsoap --list-plugins-xml
```

--------------------------------

### Liquidsoap Cue Point Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/seek

This example demonstrates how to use the `cue_cut` operator to set cue-in at 10 seconds and cue-out at 45 seconds for a source.

```liquidsoap
set(
  "cue_in_metadata", "liq_cue_in",
  "cue_out_metadata", "liq_cue_out"
)

my_source = cue_cut(my_source)

```

--------------------------------

### Configure and Build Liquidsoap

Source: https://liquidsoap.readthedocs.io/en/stable/content/build

This snippet shows the basic steps to configure, build, and install Liquidsoap. It includes options for specifying the user and group for daemon operation and mentions the INSTALL_DAEMON variable for package preparation.

```bash
% ./configure
% make
% make install
```

```bash
% ./configure --with-user=<login> --with-group=<group>
% make
% make install
```

```bash
INSTALL_DAEMON="yes" % make install
```

--------------------------------

### Install Liquidsoap from Debian/Ubuntu Repository

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

This snippet shows how to install a specific version of Liquidsoap from the added repository on Debian/Ubuntu systems. It demonstrates how to list available packages and install a package, such as the latest master branch.

```bash
apt-cache show liquidsoap
[sudo] apt-get install liquidsoap-master
```

--------------------------------

### Liquidsoap Protocol Examples

Source: https://liquidsoap.readthedocs.io/en/stable/content/requests

Demonstrates the usage of various supported protocols in Liquidsoap for fetching media and synthesizing speech, including custom metadata annotation.

```liquidsoap
say:I am a robot
time: It is exactly $(time), and you're still listening.
annotate:nick="alice",message="for bob":/some/track/uri
```

--------------------------------

### Pin Liquidsoap from Source using OPAM

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

This code block shows how to install Liquidsoap by pinning a local source repository using OPAM. This is useful for development or testing specific versions.

```bash
git clone https://github.com/savonet/liquidsoap.git
cd liquidsoap
opam pin add liquidsoap .
```

--------------------------------

### Install Liquidsoap on Debian/Ubuntu

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

Instructions for installing Liquidsoap on Debian-based systems like Ubuntu using the system's package manager.

```shell
sudo apt-get update
sudo apt-get install liquidsoap
```

--------------------------------

### Liquidsoap Source Examples

Source: https://liquidsoap.readthedocs.io/en/stable/content/quick_start

Illustrates different ways to define audio sources in Liquidsoap, including HTTP streams, local files, and soundcards. It highlights the fallible nature of sources and how to handle potential errors.

```liquidsoap
# HTTP Stream Source
http_source = input.http("http://stream.example.com/music.mp3")

# Local File Source
file_source = input.file("/path/to/your/music.ogg")

# Soundcard Input (requires configuration)
soundcard_source = input.soundcard()

# Example of a fallible source
fallible_source = fallback(sources=[http_source, file_source])

# Using a source in a playlist
my_playlist = playlist([fallible_source])

# Output the playlist
output.dummy(my_playlist)
```

--------------------------------

### GStreamer Encoder Examples

Source: https://liquidsoap.readthedocs.io/en/stable/content/gstreamer_encoder

Provides basic examples for using the GStreamer encoder in Liquidsoap, including content type inference and metadata handling. It also mentions caveats related to its usage.

```liquidsoap
# Basic GStreamer encoding example
set_encoder(encoder_gstreamer(bitrate=128, samplerate=44100, channels=2, "audio/mpeg"))

# Example with metadata
set_encoder(encoder_gstreamer(bitrate=128, samplerate=44100, channels=2, "audio/mpeg", metadata=true))

# Content type inference example
set_encoder(encoder_gstreamer(bitrate=128, samplerate=44100, channels=2, "audio/x-raw", "audio/mpeg"))
```

--------------------------------

### Install Latest Development Version

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

Information on how to obtain and install the most recent development version of Liquidsoap, often from a version control system like Git.

```shell
# Clone the Git repository
# git clone https://github.com/savonet/liquidsoap.git
# cd liquidsoap

# Follow build instructions as for installing from source
```

--------------------------------

### Example: FFmpeg for Video Encoding

Source: https://liquidsoap.readthedocs.io/en/stable/content/external_encoders

An example of using FFmpeg with LiquidSoap's external encoder functionality to generate a compressed AVI file.

```bash
ffmpeg -i - -f avi "compressed.avi"
```

--------------------------------

### Liquidsoap Configuration Variables Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/custom-path

Demonstrates how to set environment variables to configure Liquidsoap's behavior, such as library paths, base directory, and magic file locations.

```bash
LD_LIBRARY_PATH=/path/to/ld
LIQUIDSOAP_BASE_DIR=..
MAGIC=../magic/magic.mime

```

--------------------------------

### List and Describe LADSPA Plugins

Source: https://liquidsoap.readthedocs.io/en/stable/content/ladspa

This section details how to interact with LADSPA plugins from the command line. It explains how to list all available plugins and how to get specific details about a single plugin.

```bash
liquidsoap --list-plugins
liquidsoap -h ladspa.plugin
```

--------------------------------

### Example Query Transformation

Source: https://liquidsoap.readthedocs.io/en/stable/content/bubble

Illustrates how an IRC bot might transform a user's song request into a Liquidsoap-compatible Bubble URI. This example shows the process of taking a natural language query and converting it into a structured URI that Liquidsoap can understand and process.

```liquidsoap
bubble:title="Alabama song"
```

--------------------------------

### Liquidsoap Request Resolution Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/requests

Illustrates a complex recursive resolution process with backtracking for media requests in Liquidsoap, showing how URIs are transformed and resolved to local files.

```liquidsoap
* bubble:artist="bodom" * ftp://no/where * Error
* ftp://some/valid.ogg * /tmp/success.ogg
```

--------------------------------

### Liquidsoap init.d Service Script

Source: https://liquidsoap.readthedocs.io/en/stable/content/advanced

This section explains the usage of the `init.d/liquidsoap` service script for managing Liquidsoap instances in a production environment. It covers starting, stopping, and restarting the service.

```bash
# Example: Managing the Liquidsoap service using init.d script
# sudo /etc/init.d/liquidsoap start
# sudo /etc.init.d/liquidsoap stop
# sudo /etc/init.d/liquidsoap restart
```

--------------------------------

### Ogg Container Syntax

Source: https://liquidsoap.readthedocs.io/en/stable/content/encoding_formats

Demonstrates the syntax for combining audio formats within an Ogg container using Liquidsoap. It shows the general %ogg(x,y,z) syntax and a specific example for Vorbis.

```liquidsoap
%ogg(x,y,z)
%vorbis(...)
```

--------------------------------

### Liquidsoap Configuration Variables

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

Details on how to set and manage configuration variables within Liquidsoap, including examples of adding custom paths and defining variables.

```liquidsoap
# Example of setting a configuration variable
set("log.file.path", "/var/log/liquidsoap/liquidsoap.log")

# Example of adding a custom path for plugins or scripts
add_path("script.dir", "/path/to/my/scripts")

# Example of a full configuration file structure
# startup_script = "/etc/liquidsoap/startup.liq"
# log.file.path = "/var/log/liquidsoap/liquidsoap.log"
# log.stdout = true
# log.stderr = true
# log.level = 5

# Example of defining a variable
my_variable = "hello world"
output(my_variable)
```

--------------------------------

### Harbor HTTP Server Configuration

Source: https://liquidsoap.readthedocs.io/en/stable/content/gstreamer_encoder

Demonstrates how to configure Liquidsoap to act as an HTTP server using the Harbor protocol. It includes basic setup and mentions limitations.

```liquidsoap
# Basic Harbor HTTP server configuration
set_harbor(port=8000, "/stream")

# Harbor with specific mount point
set_harbor(port=8000, "/radio")

# Harbor with custom mount point and protocol
set_harbor(port=8000, "/live.mp3", "audio/mpeg")
```

--------------------------------

### Liquidsoap Harbor HTTP Server

Source: https://liquidsoap.readthedocs.io/en/stable/content/metadata

Details the configuration and usage of Harbor as an HTTP server within Liquidsoap, including limitations and specific setup instructions.

```liquidsoap
# Configure Harbor as an HTTP server
harbor.http.bind("0.0.0.0", 8080)
harbor.http.mount("/", liquidsoap.default_source)

# Example of a limitation (e.g., max connections)
harbor.http.set("max_connections", 100)
```

--------------------------------

### GStreamer Encoder Basic Examples

Source: https://liquidsoap.readthedocs.io/en/stable/content/gstreamer_encoder

Demonstrates basic configurations for GStreamer encoders with different media types (MP3, x264, MPEG TS, ogg/vorbis+theora). It also shows how to override the entire pipeline using the 'pipeline' argument.

```liquidsoap
% liquidsoap 'output.file(%gstreamer(pipeline="appsrc name=\"audio_src\"
    block=true caps=\"audio/x-raw,format=S16LE,layout=interleaved,
    channels=1,rate=44100\" format=time ! lamemp3enc ! appsink name=sink
    sync=false emit-signals=true",channels=1,log=3),...)'
```

--------------------------------

### Liquidsoap Server Commands for Request Monitoring

Source: https://liquidsoap.readthedocs.io/en/stable/content/requests

Provides examples of Liquidsoap server commands used to trace, monitor, and retrieve information about media requests, including their resolution process and metadata.

```APIDOC
request.trace
  - Shows a log of the resolution process for a request.

request.metadata
  - Shows the current metadata of a request.

request.all
  - Returns the list of all requests.

request.alive
  - Returns the list of currently alive requests.

request.resolving
  - Returns the list of currently resolving requests.

request.on_air
  - Returns the list of currently playing requests.
```

--------------------------------

### Harbor HTTP Input Configuration

Source: https://liquidsoap.readthedocs.io/en/stable/content/harbor_http

This section details the configuration options for the Harbor HTTP input in Liquidsoap. It covers redirecting Icecast pages, getting and setting metadata, and limitations of the Harbor HTTP input.

```liquidsoap
## Harbor HTTP Input

### Redirect Icecast’s pages
This allows redirecting Icecast's pages to a custom URL.

### Get metadata
This describes how to retrieve metadata from the Harbor HTTP input.

### Set metadata
This describes how to set metadata for the Harbor HTTP input.

### Limitations
This section outlines the limitations of the Harbor HTTP input.
```

--------------------------------

### Custom Protocol Example: Cue Cut and Normalization

Source: https://liquidsoap.readthedocs.io/en/stable/content/advanced

Illustrates a custom Liquidsoap protocol that cuts a specific segment from an audio file and applies normalization. The protocol string specifies the cut duration and start time, followed by the normalization command.

```liquidsoap
protocol.add("normalize:cue_cut", "normalize --seek %fs --length %fs %s", "cut_protocol")

```

--------------------------------

### Liquidsoap Basic Radio Script

Source: https://liquidsoap.readthedocs.io/en/stable/content/quick_start

A fundamental Liquidsoap script to set up a simple internet radio station. This script demonstrates basic source declaration, playlist management, and streaming output configuration.

```liquidsoap
radio = input.http("http://stream.example.com/radio")
playlist = playlist([radio])
output.dummy(playlist)
```

--------------------------------

### Liquidsoap Execution Phases Overview

Source: https://liquidsoap.readthedocs.io/en/stable/content/phases

Provides a high-level understanding of how Liquidsoap scripts execute. This includes the initialization phase where the script is loaded and configured, the main execution loop where audio processing and streaming occur, and the shutdown phase for cleanup.

```liquidsoap
# Liquidsoap Execution Phases
#
# 1. Initialization Phase:
#    - Script loading and parsing
#    - Configuration loading
#    - Resource allocation (e.g., network sockets, file handles)
#    - Initial setup of audio sources and outputs
#
# 2. Main Execution Loop:
#    - Processing incoming requests (e.g., HTTP, Icecast)
#    - Managing audio sources (e.g., playlists, live inputs)
#    - Applying audio transformations (e.g., normalization, effects)
#    - Encoding and streaming audio data
#    - Handling events and timers
#
# 3. Shutdown Phase:
#    - Graceful termination of all operations
#    - Releasing resources
#    - Saving any necessary state

```

--------------------------------

### Liquidsoap Scripting Language Basics

Source: https://liquidsoap.readthedocs.io/en/stable/content/playlist_parsers

Introduction to the core concepts and syntax of the Liquidsoap scripting language. Covers basic operators, flow control, and fundamental building blocks for creating audio streams.

```liquidsoap
# Basic stream definition
radio = stream.connect("http://stream.example.com/radio")

# Applying an effect
processed_radio = effect.volume(radio, -3.0)

# Outputting the stream
output.icecast(processed_radio, host="localhost", port=8000, password="hackme", mount="/radio")
```

--------------------------------

### Liquidsoap Scripting Language Basics

Source: https://liquidsoap.readthedocs.io/en/stable/content/harbor

Introduction to the fundamental concepts and syntax of the Liquidsoap scripting language. This covers basic operators and how to structure scripts for audio streaming.

```liquidsoap
# Basic script structure
radio = input.http("http://stream.example.com/radio")
output.icecast(%vorbis, radio)

# Using a variable
my_stream = input.dummy(samplerate=44100, channels=2)
output.file("output.wav", my_stream)
```

--------------------------------

### Liquidsoap Scripting Language Basics

Source: https://liquidsoap.readthedocs.io/en/stable/content/install

Introduction to Liquidsoap's scripting language, including basic syntax, variable assignment, and output.

```liquidsoap
# Assigning a string to a variable
my_string = "Hello, Liquidsoap!"

# Assigning a number to a variable
my_number = 123

# Printing a variable to the console or log
log(my_string)

# Basic conditional statement
if my_number > 100 then
  log("Number is greater than 100")
else
  log("Number is 100 or less")
end

# Defining a simple function
def greet(name)
  return "Hello, " + name + "!"
end

log(greet("World"))
```

--------------------------------

### Anonymizer Effect (Blur Face, Change Voice)

Source: https://liquidsoap.readthedocs.io/en/stable/content/video

An example effect to blur faces and alter voice for anonymity in video streams. This is a conceptual example and requires specific implementations for blurring and voice modification.

```liquidsoap
# Conceptual example for anonymizer
# Requires specific plugins/operators for face detection and voice modification
```

--------------------------------

### GStreamer Encoder Metadata Examples

Source: https://liquidsoap.readthedocs.io/en/stable/content/gstreamer_encoder

Illustrates how to encode metadata with the GStreamer encoder by specifying a pipeline element for GStreamer's tag_setter API. Examples include ogg/vorbis with vorbis tags and MP3 with id3v2 tags.

```liquidsoap
% liquidsoap 'output.file(%gstreamer(audio="vorbisenc ! vorbistag name='metadata'",
                                     muxer="oggmux",
                                     video=""),...)'
```

```liquidsoap
% liquidsoap 'output.file(%gstreamer(audio="lamemp3enc",
                                     muxer="id3v2mux",
                                     video="",
                                     metadata="muxer"),...)'
```

--------------------------------

### Setting Metadata via HTTP GET Request

Source: https://liquidsoap.readthedocs.io/en/stable/content/harbor_http

Shows how to create an HTTP GET handler that updates the metadata of a Liquidsoap source. A request like `http://server:7000/setmeta?title=foo` modifies the source's metadata.

```liquidsoap
s = source.file("audio.mp3")
harbor.http.register(port=7000, uri="/setmeta", handler=function(protocol, data, headers, uri) -> string {
  params = url_query_params(uri)
  if has_key(params, "title") {
    s.metadata.insert("title", params["title"])
  }
  return http_response(data="Metadata updated.")
})
```

--------------------------------

### Liquidsoap Basic Concepts and Features

Source: https://liquidsoap.readthedocs.io/en/stable/content/encoding_formats

Introduces fundamental Liquidsoap concepts such as clocks, blank detection, and bubble functionality. It also touches upon building Liquidsoap from source and handling documentation indices.

```liquidsoap
# Clocks
# Blank detection
# Bubble
# Building Liquidsoap
# Documentation index
```

--------------------------------

### Server/Telnet Seek Function Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/seek

An example demonstrating how to implement a server/telnet seek function using Liquidsoap's `source.seek` capability. It shows hooking the function close to the original source for seeking within radio streams.

```liquidsoap
server.add_telnet_client(port=1234, "telnet_client")

radio_source = input.http(url="http://stream.example.com/radio")

# Hook the seek function to the radio source
seekable_radio_source = source.seekable(radio_source)

# Example of a telnet command to seek
server.add_telnet_command(port=1234, "seek", function(client, args) {
  if args == "+" then
    source.seek(seekable_radio_source, 3.)
  elseif args == "-" then
    source.seek(seekable_radio_source, -3.)
  else
    client.print("Usage: seek + or -\n")
  end
})
```

--------------------------------

### Liquidsoap Scripting Language Basics

Source: https://liquidsoap.readthedocs.io/en/stable/content/help

Provides an overview of Liquidsoap's scripting language, covering fundamental concepts and syntax for developing audio processing flows.

```liquidsoap
This section details the core scripting language used in Liquidsoap, enabling users to define complex audio processing pipelines and streaming logic.
```

--------------------------------

### Recommended Dependencies

Source: https://liquidsoap.readthedocs.io/en/stable/content/build

Lists dependencies that enhance Liquidsoap's capabilities, specifically for character set recoding and audio conversion. These are recommended for improved metadata handling and audio processing.

```APIDOC
camomile:
  Version: >=1.0.0
  Functionality: Charset recoding in metadata

ocaml-samplerate:
  Version: >=0.1.1
  Functionality: Libsamplerate audio conversion
```

--------------------------------

### Get Single Radio API

Source: https://liquidsoap.readthedocs.io/en/stable/content/flows

Retrieves details for a single radio, encoded in JSON format, using its unique token. All arguments are optional and should be UTF8 encoded for HTTP GET requests. A direct request using a radio's token can also be performed.

```APIDOC
GET http://flows.liquidsoap.info/radio/:token

Response Body Example:
{
  "token": "a60f5cadf2645321d4d061896318a2d99f2ff6a6",
  "name": "RadioPi - Canal Jazz",
  "website": "http://www.radiopi.org/",
  "description": "Cool vibes from Chatenay!",
  "genre": "jazz",
  "longitude": 2.26670002937317,
  "latitude": 48.7667007446289,
  "title": "Bud Powell - Un Poco Loco",
  "artist": "Va-1939-1999 - 60 Ans De Jazz",
  "streams": [
    {
      "format": "mp3/128k",
      "url": "http://radiopi.org:8080/jazz"
    }
  ]
}
```

--------------------------------

### Disjoint Clocks Error Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/clocks

This example demonstrates a scenario where Liquidsoap would produce a fatal error due to a source being assigned to two different clocks. The error message 'a source cannot belong to two clocks' highlights the conflict when a source is tied to an ALSA output and then used in an operator like 'crossfade' which requires its own dedicated clock.

```liquidsoap
s = alsa.output(port="hw:0,0")
crossfade(s, s2)
```

--------------------------------

### Liquidsoap External Encoders

Source: https://liquidsoap.readthedocs.io/en/stable/content/faq

Details on using external encoders with Liquidsoap, including configuration and usage examples.

```liquidsoap
# Example: Using an external Ogg Vorbis encoder
output.file("output.ogg", init=encoder.vorbis(), file="output.ogg")
```

--------------------------------

### Initial Perl Implementation

Source: https://liquidsoap.readthedocs.io/en/stable/content/geekradio

Describes the early version of the Geek Radio system which used Perl and Ices to play audio files. It highlights the limitations and the need for a more robust solution.

```perl
sub play_file {
  my ($file) = @_;
  # Ices command to play a file
  system("ices --play $file");
}
```

--------------------------------

### Blue Screen Effect Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/video

Replace a blue screen background in a video source with another video or image.

```liquidsoap
video.blue_screen(source, background_video)
```

--------------------------------

### Liquidsoap Server Commands and Help

Source: https://liquidsoap.readthedocs.io/en/stable/index

Provides information on interacting with a running Liquidsoap instance via server commands and accessing help resources. This includes scripting API, server commands, settings, and plugin lists.

```APIDOC
Liquidsoap Server Commands:

  help
    Description: Displays available server commands.

  scripting.api
    Description: Shows the available scripting functions and their signatures.

  server.commands
    Description: Lists all available server commands.

  settings
    Description: Displays the current Liquidsoap configuration settings.

  plugins.list
    Description: Lists all loaded Liquidsoap plugins.

Usage:
  Connect to the Liquidsoap server using a telnet client or the 'liqcli' tool and issue these commands.
```

--------------------------------

### Liquidsoap Smart Crossfade

Source: https://liquidsoap.readthedocs.io/en/stable/content/faq

Explanation and examples of implementing smart crossfade techniques in Liquidsoap for smooth transitions between tracks.

```liquidsoap
# Example: Basic crossfade configuration
set("crossfade.duration", 3.0)
set("crossfade.mode", "smart")
```

--------------------------------

### FFmpeg MP3 Encoding Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/encoding_formats

Configures the FFmpeg encoder for MP3 audio encoding using the libshine codec.

```liquidsoap
%ffmpeg(format="mp3",codec="libshine")
```

--------------------------------

### Liquidsoap Harbor Input

Source: https://liquidsoap.readthedocs.io/en/stable/content/faq

Details on configuring and using Harbor as an input source in Liquidsoap.

```liquidsoap
# Example: Using Harbor as an input source
input.harbor(port=8080)
```

--------------------------------

### Server Readline

Source: https://liquidsoap.readthedocs.io/en/stable/content/server

Reads a line of text from the server connection. This is a simple way to get input from a client connected via telnet or a socket.

```liquidsoap
server.readline()

```

--------------------------------

### Liquidsoap Harbor HTTP Server

Source: https://liquidsoap.readthedocs.io/en/stable/content/faq

Documentation for setting up and using Harbor as an HTTP server within Liquidsoap for streaming.

```liquidsoap
# Example: Starting Harbor HTTP server
server.harbor.start(port=8000, mount="/stream")
```

--------------------------------

### Liquidsoap Harbor HTTP Server

Source: https://liquidsoap.readthedocs.io/en/stable/content/playlist_parsers

Configuration and usage of Harbor as an HTTP server for streaming. This includes setting up mount points and handling client connections.

```liquidsoap
# Configuring Harbor HTTP output
output.http(..., port=8080, mount="/stream")

# Setting up a fallback stream for Harbor
set("harbor.fallback_stream", "http://fallback.example.com/stream")
```

--------------------------------

### Liquidsoap Scripting Language Basics

Source: https://liquidsoap.readthedocs.io/en/stable/content/flows_devel

Introduces the fundamental concepts and syntax of Liquidsoap's scripting language. It covers how to write basic scripts for audio streaming, including defining sources, applying effects, and managing playlists.

```liquidsoap
# Basic Liquidsoap script
radio = input.dummy(duration=10.0)
output.stdout(radio)

```

--------------------------------

### Liquidsoap Playlist Management

Source: https://liquidsoap.readthedocs.io/en/stable/content/quick_start

Demonstrates how to create and manage playlists in Liquidsoap, including adding sources and defining playback behavior. This is crucial for organizing and playing audio content.

```liquidsoap
# Create a playlist with multiple sources
my_playlist = playlist([
  input.file("/music/song1.mp3"),
  input.http("http://stream.example.com/stream.ogg"),
  input.file("/music/song2.flac")
])

# Set playlist to repeat
set("playlist.repeat", true)

# Output the playlist
output.dummy(my_playlist)
```

--------------------------------

### Liquidsoap Flow Development

Source: https://liquidsoap.readthedocs.io/en/stable/content/flows

Information on developing custom flows within Liquidsoap. This includes getting information from flows, managing playlists, and setting up stream redirection.

```liquidsoap
# Example of a simple flow
radio = single("http://stream.example.com/radio")
output.dummy(radio)

```

--------------------------------

### Runtime Optional Dependencies

Source: https://liquidsoap.readthedocs.io/en/stable/content/build

Lists external tools and libraries that are optional at runtime for specific protocol support and advanced features like YouTube integration and audio analysis.

```APIDOC
awscli:
  Functionality: `s3://` and `polly://` protocol support

curl:
  Functionality: `http`/`https`/`ftp` protocol support

ffmpeg:
  Functionality: external I/O, `replay_gain` level computation, ..

youtube-dl:
  Functionality: youtube video and playlist support
```

--------------------------------

### Liquidsoap Script Execution

Source: https://liquidsoap.readthedocs.io/en/stable/content/cookbook

Illustrates the method for running longer Liquidsoap recipes, which typically involve creating a dedicated script file. This approach is suitable for more complex configurations and functionalities.

```liquidsoap
# Your longer Liquidsoap script here
# Example:
# source = audio_file("path/to/your/audio.mp3")
# out(source)
```

--------------------------------

### FFmpeg AAC Encoding Example

Source: https://liquidsoap.readthedocs.io/en/stable/content/encoding_formats

Configures the FFmpeg encoder for AAC audio encoding at 22050kHz using the fdk-aac encoder and mpegts muxer. Includes settings for bitrate and afterburner.

```liquidsoap
%ffmpeg(format="mpegts",ar=22050,codec="libfdk_aac",b="32k",afterburner=1,profile="aac_he_v2")
```

--------------------------------

### GStreamer Encoder in Liquidsoap

Source: https://liquidsoap.readthedocs.io/en/stable/index

Details the usage of the GStreamer encoder within Liquidsoap. It covers basic examples, content type inference, metadata handling, and potential caveats when using this encoder.

```liquidsoap
# Basic GStreamer encoder example
set encoder.gstreamer.codec "libmp3lame"
set encoder.gstreamer.bitrate "128"

# Content type inference
# Liquidsoap can often infer content types automatically.

# Metadata handling
# Metadata can be set using the metadata.set function.
```

--------------------------------

### Liquidsoap Configuration Variables

Source: https://liquidsoap.readthedocs.io/en/stable/content/advanced

This section details various configuration variables used in Liquidsoap for customizing its behavior. It covers aspects like adding binaries, setting up paths, and managing runtime parameters.

```liquidsoap
# Example of a configuration variable
set("log.file.path", "/var/log/liquidsoap.log")
set("prefs.user_agent", "MyLiquidsoapClient")
```

--------------------------------

### Liquidsoap Server Commands and Settings

Source: https://liquidsoap.readthedocs.io/en/stable/content/help

Details the available server commands and settings that can be used to control and configure a running Liquidsoap instance.

```APIDOC
Liquidsoap Server Commands:

- `help`:
  - Displays help information for various aspects of Liquidsoap.
  - Usage: `help [topic]`
  - Topics include: scripting-api, server-commands, settings, all-plugins.

- `quit`:
  - Shuts down the Liquidsoap instance.
  - Usage: `quit`

Liquidsoap Settings:

- `set <variable> = <value>`:
  - Sets a configuration variable.
  - Example: `set log_level = "info"`

- `get <variable>`:
  - Retrieves the current value of a configuration variable.
  - Example: `get log_level`
```
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