// The decoder lives in an iframe you need to load it into your document. // load the mp2 decoder (doesn't quite work like this yet, in the source you will see I'm doing foo("exports")) mp2_dec=require("mp2_decoder"); // create mp2 state var mp2=mp2_dec.kjmp2_make_mp2_state(); // initialise the decoder mp2_dec.kjmp2_init(mp2); // get your sample rate (frame is an array containing mp2 data) var samplerate=mp2_dec.kjmp2_get_sample_rate(frame); // decode your first frame // l and r are the output arrays (left and right channel) // pcm is unused (must be set to an empty array, silly bug) var bytes_read=mp2_dec.kjmp2_decode_frame(mp2,frame,pcm,l,r);
Retrieves whole file, then decodes it in one go. Once it has decoded you can then play the audio (a play button will appear). Should work in Firefox 5,6 , and possibly 4. Decoding is scheduled using setTimeout, so keep this tab focused. Audio file is public domain. ( ... and about 2MB, so be patient).