当频率改变时，有时会听到咔哒声。我试图通过几种方式消除点击，例如，只有当音量不止一次达到0时才改变频率。我试着计算什么时候一个周期将完全结束，但也没有工作。
import sys
import sdl2
import sdl2.ext
import math
import struct
import ctypes
basefreq = 110
nframes = 0
tab = [1]
left=0
m= [0]
x=[0]
x2=[0]
x3=[11025]
x4=[0]
i2=[1]
x5=[0]
@ctypes.CFUNCTYPE(None, ctypes.c_void_p, ctypes.POINTER(sdl2.Uint8), ctypes.c_int)
def playNext(notused, stream, len):
global nframes
for i in range(0, len, 4):
t = (nframes + i) / 44100
i2[0] = i2[0] + 1
t4 = (nframes + i2[0]) / 44100
left2 = math.sin(2 * math.pi * t * (basefreq + int(tab[0])))
left = int(math.sin(2 * math.pi * t * (basefreq + int(tab[0]) )) * 32000)
right = int(math.sin(2 * math.pi * t * (basefreq + 1)) * 32000)
#print(t*100000)
x3[0]=x3[0]+1
t2 = 1 / (basefreq + tab[0])
d2 = i / (44100 * t2)
t3 = x3[0] / (basefreq + tab[0])
d3 = i / (44100 * t3)
width = 344/(basefreq + tab[0])
if (int(t * 100000) % 100000 == 0):
#print(t, " : ", i, " : ", x3[0], " : ", t3," : ", t2," : ",basefreq + tab[0])
x4[0]=0
x3[0] = 0
if (int(d2 * 10) % 2 == 0):
g = x2[0]
x2[0] = 0
dd = g / (44100 * t2)
# print(left, " : ", left)
x2[0] = x2[0] + 1
e = dd * 44100
x4[0]=x4[0]+1
#print(x4[0])
#if(int(left)*1000==0):
#if ((left * 100 <= 0 or left * 100 <= 0) and (left * 100 < 500 or left * 100 > -500)):
print(int(left2*100))
if (int(left2*100) ==0):
if (x5[0] == 10):
#if(int(t*10000)%int(t2*10000)==0):
#if (int(d2 * 10) % 2 == 0 and (i / 100) % int(e / 100) == 0 ):
#if(i*1000%int(t3*220*1000)==0):
tab[0] =math.sin(x[0] / 100)*100+100
x[0]=x[0]+1
i2[0] = i2[0] - 1
x5[0]=0
else:
x5[0]=x5[0]+1
if((nframes + i)%4==0):
stream[i] = left & 0xff
stream[i+1] = (left >> 8) & 0xff
stream[i+2] = right & 0xff
stream[i+3] = (right >> 8) & 0xff
nframes += len
def initAudio():
spec = sdl2.SDL_AudioSpec(0, 0, 0, 0)
spec.callback = playNext
spec.freq = 44100
spec.format = sdl2.AUDIO_S16SYS
spec.channels = 2
spec.samples = 1024
devid = sdl2.SDL_OpenAudioDevice(None, 0, spec, None, 0)
sdl2.SDL_PauseAudioDevice(devid, 0)
def run():
global basefreq
sdl2.SDL_Init(sdl2.SDL_INIT_AUDIO | sdl2.SDL_INIT_TIMER | sdl2.SDL_INIT_VIDEO)
window = sdl2.ext.Window("Tone Generator", size=(800, 600))
window.show()
running = True
initAudio()
while running:
events = sdl2.ext.get_events()
for event in events:
if event.type == sdl2.SDL_QUIT:
running = False
break
elif event.type == sdl2.SDL_KEYDOWN:
if event.key.keysym.sym == sdl2.SDLK_UP:
basefreq *= 2
elif event.key.keysym.sym == sdl2.SDLK_DOWN:
basefreq /= 2
break
sdl2.SDL_Delay(1)
return 0
if __name__ == "__main__":
sys.exit(run())
我认为这个问题很难解决。有人能帮我解决这个问题吗?
如何修复:
phase = 0
def playNext(notused, stream, len):
global nframes, phase
phase = phase%(2 * math.pi)
delta_phase = 2.0 * math.pi * basefreq / 44100
for i in range(0, len, 4):
phase += delta_phase
left = int(math.sin(phase) * 32000)
# other same as before