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 get_length(self):
""" get_length() -> seconds
get the length of the Sound
"""
check_mixer()
frequency, format, channels = (ffi.new('int*'), ffi.new('uint16_t*'),
ffi.new('int*'))
sdl.Mix_QuerySpec(frequency, format, channels)
if format == sdl.AUDIO_S8 or format == sdl.AUDIO_U8:
mixerbytes = 1.0
else:
mixerbytes = 2.0
numsamples = self.chunk.alen / mixerbytes / channels[0]
return numsamples / frequency[0]
def get_init():
"""get_init(): return (frequency, format, channels)
test if the mixer is initialized"""
if not sdl.SDL_WasInit(sdl.SDL_INIT_AUDIO):
return None
freq = ffi.new("int *")
audioformat = ffi.new("uint16_t *")
chan = ffi.new("int *")
if not sdl.Mix_QuerySpec(freq, audioformat, chan):
return None
if audioformat[0] & ~0xff:
format_in_bits = -(audioformat[0] & 0xff)
else:
format_in_bits = audioformat[0] & 0xff
return (int(freq[0]), format_in_bits, int(chan[0]))
