Can PHP Extract Track Information from Audio Streams?

Pulling Track Info from an Audio Stream Using PHP

Determining if it is feasible to extract track information from an audio stream using PHP leads us to the stream_get_transports function. However, for those who encounter support limitations for HTTP transports via fsockopen(), alternative methods need exploration.

Delving into Metadata Extraction

Fortunately, extracting track info from an audio stream is possible, particularly in the case of SHOUTcast streams. This operation differs from extracting ID3 tags and requires a unique approach.

Establishing the Connection

Connect directly to the server via fsockopen(), specifying the appropriate port (e.g., port 80). Communicate with the server using an HTTP request and include the Icy-MetaData:1 header to request metadata.

Understanding the Meta Interval

The server will respond with headers containing the icy-metaint value, which indicates the meta interval. This interval determines the frequency of metadata packets within the stream.

Reading and Parsing Metadata

Discard 8192 bytes of MP3 data, then read the first byte, which signifies the length of the metadata packet. Multiply this byte value by 16 to determine the number of bytes to read for the metadata.

Splitting and Retrieving Information

Trim the metadata string to remove padding. Parse the string, splitting it at the ";" delimiter, to extract information such as track title and stream URL.

Optional Resources

For further assistance with SHOUTcast metadata retrieval, refer to external resources such as https://web.archive.org/web/20191121035806/http://www.smackfu.com/stuff/programming/shoutcast.html.

The above is the detailed content of Can PHP Extract Track Information from Audio Streams?. For more information, please follow other related articles on the PHP Chinese website!