added chikkenplayer

Author: todbot

larger-tricks/chikkenplayer.py

@@ -0,0 +1,50 @@
+# chikkenplayer.py - StreetChicken Remixer by todbot
+# 21 Mar 2021 - @todbot / Tod Kurt, from @jedgarpark idea
+#
+import time
+import board
+import analogio
+import keypad
+import audiocore
+import audiomixer
+from audiopwmio import PWMAudioOut as AudioOut
+
+time.sleep(5) # wait a bit to reduce noise from CIRCUITPY access
+
+wav_files = (
+    "wav/chikken1_161_22k16b.wav", # slowed down & hacked StreetChicken
+    "wav/chikken2_161_22k16b.wav", # fat distorty bassline
+    "wav/chikken3_161_22k16b.wav", # reversed & slowed & warped StreetChicken
+    "wav/chikken4_161_22k16b.wav", # 808 drum pattern (kick + snare only)
+    "wav/chikken5_161_22k16b.wav", # chunky guitar power chords
+    "wav/chikken6_161_22k16b.wav", # ethereal space arpeggios
+)
+
+# knob to adjust loop levels
+knob = analogio.AnalogIn(board.A3)
+# what keys to use 
+keys = keypad.Keys((board.RX, board.SCK, board.MISO, board.MOSI, board.SCL, board.SDA),
+                   value_when_pressed=False, pull=True)
+# audio output
+audio = AudioOut(board.TX) # board.A0 for SAMD chips, any for rp2040 pico
+mixer = audiomixer.Mixer(voice_count=len(wav_files), sample_rate=22050, channel_count=1,
+                         bits_per_sample=16, samples_signed=True)
+audio.play(mixer) # attach mixer to audio playback, play with mixer.voice[n].play()
+
+# start loops playing, but silently
+for i in range(len(wav_files)):
+  wave = audiocore.WaveFile(open(wav_files[i],"rb"))
+  mixer.voice[i].play(wave, loop=True)
+  mixer.voice[i].level = 0.0
+
+print("chikenplayer ready")
+voice_num = None  # which loop level to change if any
+while True:
+  event = keys.events.get()
+  if event:
+    if event.pressed:  voice_num = event.key_number
+    if event.released: voice_num = None
+  if voice_num is not None:  # while voice key is pressed, adjust level
+    val = knob.value
+    mixer.voice[voice_num].level = val / 65535 # convert to 0-1.0
+