Method play_Bar

mingus/midi/sequencer.py:206–234

Play a Bar object. Return a dictionary with the bpm lemma set on success, an empty dict on some kind of failure. The tempo can be changed by setting the bpm attribute on a NoteContainer.

(self, bar, channel=1, bpm=120)

        return True

    def play_Bar(self, bar, channel=1, bpm=120):
        """Play a Bar object.

        Return a dictionary with the bpm lemma set on success, an empty dict
        on some kind of failure.

        The tempo can be changed by setting the bpm attribute on a
        NoteContainer.
        """
        self.notify_listeners(
            self.MSG_PLAY_BAR, {"bar": bar, "channel": channel, "bpm": bpm}
        )

        # length of a quarter note
        qn_length = 60.0 / bpm
        for nc in bar:
            if not self.play_NoteContainer(nc[2], channel, 100):
                return {}

            # Change the quarter note length if the NoteContainer has a bpm
            # attribute
            if hasattr(nc[2], "bpm"):
                bpm = nc[2].bpm
                qn_length = 60.0 / bpm
            ms = qn_length * (4.0 / nc[1])
            self.sleep(ms)
            self.notify_listeners(self.MSG_SLEEP, {"s": ms})
            self.stop_NoteContainer(nc[2], channel)
        return {"bpm": bpm}

    def play_Bars(self, bars, channels, bpm=120):
        """Play several bars (a list of Bar objects) at the same time.