vlc.py 文件源码

def tracks_get(self):
        """Get media descriptor's elementary streams description
        Note, you need to call L{parse}() or play the media at least once
        before calling this function.
        Not doing this will result in an empty array.
        The result must be freed with L{tracks_release}.
        @version: LibVLC 2.1.0 and later.
        """
        mediaTrack_pp = ctypes.POINTER(MediaTrack)()
        n = libvlc_media_tracks_get(self, ctypes.byref(mediaTrack_pp))
        info = ctypes.cast(mediaTrack_pp, ctypes.POINTER(ctypes.POINTER(MediaTrack) * n))
        try:
            contents = info.contents
        except ValueError:
            # Media not parsed, no info.
            return None
        tracks = ( contents[i].contents for i in range(len(contents)) )
        # libvlc_media_tracks_release(mediaTrack_pp, n)
        return tracks