sound_array_demos.py 文件源码

def sound_from_pos(sound, start_pos, samples_per_second = None, inplace = 1):
    """  returns a sound which begins at the start_pos.
         start_pos - in seconds from the begining.
         samples_per_second - 
    """

    # see if we want to reuse the sound data or not.
    if inplace:
        a1 = pygame.sndarray.samples(sound)
    else:
        a1 = pygame.sndarray.array(sound)

    # see if samples per second has been given.  If not, query the mixer.
    #   eg. it might be set to 22050
    if samples_per_second is None:
        samples_per_second = pygame.mixer.get_init()[0]

    # figure out the start position in terms of samples.
    start_pos_in_samples = int(start_pos * samples_per_second)

    # cut the begining off the sound at the start position.
    a2 = a1[start_pos_in_samples:]

    # make the Sound instance from the array.
    sound2 = pygame.sndarray.make_sound(a2)

    return sound2