Display a progress bar while converting a wav file to mp3.
Automatically insert a download link for the converted file once the conversions completes. This uses jquery on the client side. Two new API methods are provided: <...>.mp3/convert_start <...>.mp3/convert_cont/<progress>/<total> The first starts the conversion and returns an AJAX dict with the following items: "status": "enqueued" "progress": 0 "workload": X X is the number of megabytes to convert (including both the current wav file and any previously queued wav files that will be converted before the current one). If somebody else converted the file before the request was made, it may also return: "status": "done" "size": human-readable size of the mp3 file "link": download link The convert_cont API waits until the progress information is significantly different than what the client says it last saw, but always waits at least 0.2 seconds. Then it returns a JSON-encoded dictionary: "status": "progress". "progress": Y "workload"": X X is as in the "enqueued" mapping above, and Y is the progress so far. Once Y == X, the conversion is complete. If that has happened, convert_cont will instead return a mapping with status "done" (see above). Redesigned how wav2mp3d reports and keeps track of progress. The wav2mp3c demo client is not updated, so it probably no longer works.