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### ANNOTATE
Add metadata to a request
The syntax is `annotate:key="val",key2="val2",...:uri`.
### FFMPEG
Decode any file to wave using ffmpeg
The syntax is `ffmpeg:uri`.
### FILE
File protocol. Only local files are supported
The syntax is `file:///path/to/file`. This protocol is static.
### GTTS
Generate speech synthesis using Google translate's text-to-speech API. This requires the `gtts-cli` binary. Result may be mono.
The syntax is `gtts:Text to read`. This protocol is static.
### HTTP
Download http URLs using curl
The syntax is `http://...`.
### HTTPS
Download http URLs using curl
The syntax is `https://...`.
### MPD
Finds all files with a tag equal to a given value using mpd.
The syntax is `mpd:tag=value`.
### POLLY
Generate speech synthesis using AWS polly service. Result might be mono, needs aws binary in the path.
The syntax is `polly:Text to read`. This protocol is static.
### PROCESS
Resolve a request using an arbitrary process. `<cmd>` is interpolated with: `[("input",<input>),("output",<output>),("colon",":")]`. `uri` is an optional child request, `<output>` is the name of a fresh temporary file and has extension `.<extname>`. `<input>` is an optional input file name as returned while resolving `uri`.
The syntax is `process:<extname>,<cmd>[:uri]`.
### REPLAYGAIN
Compute ReplayGain value using the extract-replaygain script. Adds returned value as `"replaygain_track_gain"` metadata
The syntax is `replaygain:uri`.
### S3
Fetch files from s3 using the AWS CLI
The syntax is `s3://uri`.
### SAY
Generate speech synthesis using text2wave. Result is always stereo.
The syntax is `say:Text to read`. This protocol is static.
### STEREO
Convert a file to stereo (currently decodes to wav).
The syntax is `stereo:<uri>`. This protocol is static.
### SYNTH
Syntesize audio. Parameters are optional.
The syntax is `synth:shape=sine,frequency=440.,duration=10.`. This protocol is static.
### TEXT2WAVE
Generate speech synthesis using text2wave. Result may be mono.
The syntax is `text2wave:Text to read`. This protocol is static.
### TMP
Mark the given uri as temporary. Useful when chaining protocols
The syntax is `tmp:uri`.
### YOUTUBE-DL
Resolve a request using youtube-dl.
The syntax is `youtube-dl:uri`.
### YOUTUBE-PL
Resolve a request as a youtube playlist using youtube-dl.
The syntax is `youtube-pl:uri`.
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