Snapcast can be controlled with a JSON-RPC 2.0 API over a raw TCP-Socket interface on port 1705.
Single JSON Messages are new line delimited (ndjson).
For simple tests you can fire JSON commands on a telnet connection and watch Notifications coming in:
$ telnet localhost 1705
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
// Call "Server.GetRPCVersion"
{"id":8,"jsonrpc":"2.0","method":"Server.GetRPCVersion"}
// Response is:
{"id":8,"jsonrpc":"2.0","result":{"major":2,"minor":0,"patch":0}}
// Connect a client
{"jsonrpc":"2.0","method":"Client.OnConnect","params":{"client":{"config":{"instance":1,"latency":0,"name":"","volume":{"muted":false,"percent":74}},"connected":true,"host":{"arch":"x86_64","ip":"127.0.0.1","mac":"00:21:6a:7d:74:fc","name":"T400","os":"Linux Mint 17.3 Rosa"},"id":"00:21:6a:7d:74:fc","lastSeen":{"sec":1488065507,"usec":820050},"snapclient":{"name":"Snapclient","protocolVersion":2,"version":"0.11.0-beta-1"}},"id":"00:21:6a:7d:74:fc"}}Snapcast can also be controlled on port 1780 using the HTTP protocol to (1) send
a single POST request or (2) create a long-lived WebSocket.
For simple tests, you can fire JSON commands directly within your browser.
One-shot POST requests receive only the immediate response of the request,
whereas long-lived WebSockets will also receive Notifications similar to the
telnet connection above:
const host = '127.0.0.1:1780';
const request = {
'id': 0,
'jsonrpc': '2.0',
'method': 'Server.GetRPCVersion'
};
// XHR
const xhr = new XMLHttpRequest();
xhr.open('POST', `http://${host}/jsonrpc`);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.setRequestHeader('Accept', 'application/json');
xhr.addEventListener('load', ({ currentTarget: xhr }) => {
console.log(JSON.parse(xhr.responseText)); // {"id":1,"jsonrpc":"2.0","result":{"major":2,"minor":0,"patch":0}}
});
xhr.send(JSON.stringify(++request.id && request));
// Fetch
fetch(`http://${host}/jsonrpc`, {
method: 'POST',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify(++request.id && request)
})
.then(response => response.json())
.then(content => console.log(content)); // {"id":2,"jsonrpc":"2.0","result":{"major":2,"minor":0,"patch":0}}
// Fetch with await/async
const response = await fetch(`http://${host}/jsonrpc`, {
method: 'POST',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify(++request.id && request)
});
const content = await response.json();
console.log(content); // {"id":3,"jsonrpc":"2.0","result":{"major":2,"minor":0,"patch":0}}
// WebSocket
const ws = new WebSocket(`ws://${host}/jsonrpc`);
ws.addEventListener('message', (message) => {
console.log(JSON.parse(message.data)); // {"id":4,"jsonrpc":"2.0","result":{"major":2,"minor":0,"patch":0}}
});
ws.addEventListener('open', () => ws.send(JSON.stringify(++request.id && request)));
/*
WebSockets receive Notifications of events. Connect a client, and you will eventually see in your console:
{
"jsonrpc": "2.0",
"method": "Client.OnConnect",
"params": { ... }
}
*/The client that sends a "Set" command will receive a Response, while the other connected control clients will receive a Notification "On" event. Commands can be sent in a Batch. The server will reply with a Batch and send a Batch notification to the other clients. This way the volume of multiple Snapclients can be changed with a single Batch Request.
Each JSON RPC request and response contains an identifier in the id field, which can be used to link responses to the request that caused them, as defined in the JSON RPC specification:
An identifier established by the Client that MUST contain a String, Number, or NULL value if included.
If it is not included it is assumed to be a notification. The value SHOULD normally not be Null [1] and Numbers SHOULD NOT contain fractional parts [2]
Clients should call Server.GetStatus to get the complete picture.
The Server JSON object contains a list of Groups and Streams. Every Group holds a list of Clients and a reference to a Stream. Clients, Groups and Streams are referenced in the "Set" commands by their id.
{"config":{"instance":1,"latency":0,"name":"","volume":{"muted":false,"percent":74}},"connected":true,"host":{"arch":"x86_64","ip":"127.0.0.1","mac":"00:21:6a:7d:74:fc","name":"T400","os":"Linux Mint 17.3 Rosa"},"id":"00:21:6a:7d:74:fc","lastSeen":{"sec":1488026416,"usec":135973},"snapclient":{"name":"Snapclient","protocolVersion":2,"version":"0.10.0"}}{"muted":false,"percent":74}{"clients":[{"config":{"instance":2,"latency":10,"name":"Laptop","volume":{"muted":false,"percent":48}},"connected":true,"host":{"arch":"x86_64","ip":"127.0.0.1","mac":"00:21:6a:7d:74:fc","name":"T400","os":"Linux Mint 17.3 Rosa"},"id":"00:21:6a:7d:74:fc#2","lastSeen":{"sec":1488026485,"usec":644997},"snapclient":{"name":"Snapclient","protocolVersion":2,"version":"0.10.0"}},{"config":{"instance":1,"latency":0,"name":"","volume":{"muted":false,"percent":74}},"connected":true,"host":{"arch":"x86_64","ip":"127.0.0.1","mac":"00:21:6a:7d:74:fc","name":"T400","os":"Linux Mint 17.3 Rosa"},"id":"00:21:6a:7d:74:fc","lastSeen":{"sec":1488026481,"usec":223747},"snapclient":{"name":"Snapclient","protocolVersion":2,"version":"0.10.0"}}],"id":"4dcc4e3b-c699-a04b-7f0c-8260d23c43e1","muted":true,"name":"","stream_id":"stream 1"}{"id":"stream 1","status":"idle","uri":{"fragment":"","host":"","path":"/tmp/snapfifo","query":{"chunk_ms":"20","codec":"flac","name":"stream 1","sampleformat":"48000:16:2"},"raw":"pipe:///tmp/snapfifo?name=stream 1","scheme":"pipe"}}{"groups":[{"clients":[{"config":{"instance":2,"latency":6,"name":"123 456","volume":{"muted":false,"percent":48}},"connected":true,"host":{"arch":"x86_64","ip":"127.0.0.1","mac":"00:21:6a:7d:74:fc","name":"T400","os":"Linux Mint 17.3 Rosa"},"id":"00:21:6a:7d:74:fc#2","lastSeen":{"sec":1488025751,"usec":654777},"snapclient":{"name":"Snapclient","protocolVersion":2,"version":"0.10.0"}}],"id":"4dcc4e3b-c699-a04b-7f0c-8260d23c43e1","muted":false,"name":"","stream_id":"stream 2"}],"server":{"host":{"arch":"x86_64","ip":"","mac":"","name":"T400","os":"Linux Mint 17.3 Rosa"},"snapserver":{"controlProtocolVersion":1,"name":"Snapserver","protocolVersion":1,"version":"0.10.0"}},"streams":[{"id":"stream 1","status":"idle","uri":{"fragment":"","host":"","path":"/tmp/snapfifo","query":{"chunk_ms":"20","codec":"flac","name":"stream 1","sampleformat":"48000:16:2"},"raw":"pipe:///tmp/snapfifo?name=stream 1","scheme":"pipe"}},{"id":"stream 2","status":"idle","uri":{"fragment":"","host":"","path":"/tmp/snapfifo","query":{"chunk_ms":"20","codec":"flac","name":"stream 2","sampleformat":"48000:16:2"},"raw":"pipe:///tmp/snapfifo?name=stream 2","scheme":"pipe"}}]}- Client
- Group
- Server
- Stream
- Client
- Group
- Stream
- Server
{"id":8,"jsonrpc":"2.0","method":"Client.GetStatus","params":{"id":"00:21:6a:7d:74:fc"}}{"id":8,"jsonrpc":"2.0","result":{"client":{"config":{"instance":1,"latency":0,"name":"","volume":{"muted":false,"percent":74}},"connected":true,"host":{"arch":"x86_64","ip":"127.0.0.1","mac":"00:21:6a:7d:74:fc","name":"T400","os":"Linux Mint 17.3 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