def play(loops=0, startpos=0.0):
"""play(loops=0, start=0.0): return None
Start the playback of the music stream"""
global _current_music, _music_pos, _music_pos_time, \
_music_frequency, _music_format, _music_channels
check_mixer()
if not _current_music:
raise SDLError("music not loaded")
sdl.Mix_HookMusicFinished(_endmusic_callback)
sdl.Mix_SetPostMix(_mixmusic_callback, ffi.NULL)
frequency, format, channels = (ffi.new('int*'), ffi.new('uint16_t*'),
ffi.new('int*'))
sdl.Mix_QuerySpec(frequency, format, channels)
_music_pos = 0
_music_pos_time = sdl.SDL_GetTicks()
_music_frequency = frequency[0]
_music_format = format[0]
_music_channels = channels[0]
volume = sdl.Mix_VolumeMusic(-1)
val = sdl.Mix_FadeInMusicPos(_current_music, loops, 0, startpos)
sdl.Mix_VolumeMusic(volume)
if val == -1:
raise SDLError.from_sdl_error()
def autoinit(frequency=None, size=None, channels=None, chunksize=None):
if not frequency:
frequency = _request_frequency
if not size:
size = _request_size
if not channels:
channels = _request_stereo
if not chunksize:
chunksize = _request_chunksize
if channels >= 2:
channels = 2
else:
channels = 1
# chunk must be a power of 2
chunksize = int(math.log(chunksize, 2))
chunksize = 2**chunksize
if chunksize < buffer:
chunksize *= 2
# fmt is a bunch of flags
if size == 8:
fmt = sdl.AUDIO_U8
elif size == -8:
fmt = sdl.AUDIO_S8
elif size == 16:
fmt = sdl.AUDIO_U16SYS
elif size == -16:
fmt = sdl.AUDIO_S16SYS
else:
raise ValueError("unsupported size %d" % size)
global _numchanneldata, _channeldata
if not sdl.SDL_WasInit(sdl.SDL_INIT_AUDIO):
register_quit(autoquit)
# channel stuff
if not _channeldata:
_numchanneldata = sdl.MIX_CHANNELS
_channeldata = [ChannelData() for i in range(_numchanneldata)]
if sdl.SDL_InitSubSystem(sdl.SDL_INIT_AUDIO) == -1:
return False
if sdl.Mix_OpenAudio(frequency, fmt, channels, chunksize) == -1:
sdl.SDL_QuitSubSystem(sdl.SDL_INIT_AUDIO)
return False
sdl.Mix_ChannelFinished(_endsound_callback)
# TODO: reverse stereo for 8-bit below SDL 1.2.8
sdl.Mix_VolumeMusic(127)
return True
def set_volume(volume):
"""set_volume(value): return None
set the music volume"""
check_mixer()
sdl.Mix_VolumeMusic(int(volume * 128))
def get_volume():
"""music.get_volume(): return value
get the music volume"""
check_mixer()
volume = sdl.Mix_VolumeMusic(-1)
return volume / 128.0
