Check to see if a specific format at a specific rate is supported
* by mpg123_pars.
* \param mp parameter handle
* \param rate sampling rate
* \param encoding encoding
* \return 0 for no support (that includes invalid parameters), MPG123_STEREO,
* MPG123_MONO or MPG123_STEREO|MPG123_MONO.
Check to see if a specific format at a specific rate is supported * by mpg123_pars. * \param mp parameter handle * \param rate sampling rate * \param encoding encoding * \return 0 for no support (that includes invalid parameters), MPG123_STEREO, * MPG123_MONO or MPG123_STEREO|MPG123_MONO.