/*
 * call-seq:
 *   play_inline(mrl=opened_mrl, position=0, time=0) -> Boolean
 *
 * Start playing the stream. mrl can be omitted, if it was given using Stream#open
 * or a previous Stream#play. Position and time parameters are optional and cause
 * the stream to seek to given position (percent) or time (seconds).
 *
 * This method waits until the stream has been started or failed to start.
 * Returns true, if the stream has been started successfully.
 */
static VALUE xs_play_inline(int argc, VALUE *argv, VALUE self) {