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    <p>As far as I know, there is no protocol spec anywhere, outside of the Icecast source code. Here's what I've found from packet sniffing:</p> <h2>Audio Stream</h2> <p>The protocol is similar to HTTP. The source client will connect to the server make a request with the mountpoint, and pass some headers with information about the stream:</p> <pre><code>SOURCE /mp3test ICE/1.0 content-type: audio/mpeg Authorization: Basic c291cmNlOmhhY2ttZQ== ice-name: This is my server name ice-url: http://www.google.com ice-genre: Rock ice-bitrate: 128 ice-private: 0 ice-public: 1 ice-description: This is my server description ice-audio-info: ice-samplerate=44100;ice-bitrate=128;ice-channels=2 </code></pre> <p>If all is good, the server responds with:</p> <pre><code>HTTP/1.0 200 OK </code></pre> <p>The source client then proceeds to send the binary stream data. Note that it seems some encoders don't even wait for the server to respond with <code>200 OK</code> before they start sending stream data. Just headers, an empty line, and then stream data.</p> <h2>Meta Data</h2> <p>Meta data is sent using an out-of-band HTTP request. The source client sends:</p> <pre><code>GET /admin/metadata?pass=hackme&amp;mode=updinfo&amp;mount=/mp3test&amp;song=Even%20more%20meta%21%21 HTTP/1.0 Authorization: Basic c291cmNlOmhhY2ttZQ== User-Agent: (Mozilla Compatible) </code></pre> <p>The server responds with:</p> <pre><code>HTTP/1.0 200 OK Content-Type: text/xml Content-Length: 113 &lt;?xml version="1.0"?&gt; &lt;iceresponse&gt;&lt;message&gt;Metadata update successful&lt;/message&gt;&lt;return&gt;1&lt;/return&gt;&lt;/iceresponse&gt; </code></pre> <p>Also note that both the audio stream and meta data requests are sent on the same port. Unlike SHOUTcast, this is the base port that the server is running on.</p>
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    1. POIcecast 2: protocol description, streaming to it using C#
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    1. COWhat is the format for sending the binary stream data?
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    2. CO@JonathanC, There is no format... just send the raw encoded audio data. You can even start an at arbitrary place in the stream.
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    3. COThis is not entirely clear to me. So as I record and encode to mp3 in chunks: do I put these same headers for each raw binary chunk? What I am not completely clear on is "just send raw encoded data". Do I send dump it in the body of an HTTP request?
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