[fix] Better bpm

redilysis.py

@@ -38,8 +38,12 @@ _BPM_MIN=10
 _BPM_MAX=400
 
 # Argument parsing
-# Audio Args
 parser = argparse.ArgumentParser(prog='realtime_redis')
+# Standard Args
+parser.add_argument("-v","--verbose",action="store_true",help="Verbose")
+# Redis Args
+parser.add_argument("-i","--ip",help="IP address of the Redis server ",default="127.0.0.1",type=str)
+parser.add_argument("-p","--port",help="Port of the Redis server ",default="6379",type=str)
 # Audio Capture Args
 parser.add_argument('--list-devices','-L', action='store_true', help='Which devices are detected by pyaudio')
 parser.add_argument('--mode','-m', required=False, default='spectrum', choices=['spectrum', 'bpm'], type=str, help='Which mode to use. Default=spectrum')
@@ -47,16 +51,11 @@ parser.add_argument('--device','-d', required=False, type=int, help='Which pyaud
 parser.add_argument('--sampling-frequency','-s', required=False, default=0.1, type=float, help='Which frequency, in seconds. Default={}f '.format(_SAMPLING_FREQUENCY))
 parser.add_argument('--channels','-c', required=False, default=_CHANNELS, type=int, help='How many channels. Default={} '.format(_CHANNELS))
 parser.add_argument('--rate','-r', required=False, default=44100, type=int, help='The audio capture rate in Hz. Default={} '.format(_RATE))
-#parser.add_argument('--frames','-f', required=False, default=4410, type=int, help='How many frames per buffer. Default={}'.format(_FRAMES_PER_BUFFER))
+parser.add_argument('--frames','-f', required=False, default=4410, type=int, help='How many frames per buffer. Default={}'.format(_FRAMES_PER_BUFFER))
 # BPM Mode Args
 parser.add_argument('--bpm-min', required=False, default=_BPM_MIN, type=int, help='BPM mode only. The low BPM threshold. Default={} '.format(_BPM_MIN))
 parser.add_argument('--bpm-max', required=False, default=_BPM_MAX, type=int, help='BPM mode only. The high BPM threshold. Default={} '.format(_BPM_MAX))
 
-# Redis Args
-parser.add_argument("-i","--ip",help="IP address of the Redis server ",default="127.0.0.1",type=str)
-parser.add_argument("-p","--port",help="Port of the Redis server ",default="6379",type=str)
-# Standard Args
-parser.add_argument("-v","--verbose",action="store_true",help="Verbose")
 args = parser.parse_args()
 
 # global
@@ -110,7 +109,6 @@ if( LIST_DEVICES ):
   list_devices()
   os._exit(1)
 
-p = pyaudio.PyAudio()
 
 
 def m_bpm(audio_data):
@@ -122,7 +120,6 @@ def m_bpm(audio_data):
     global bpm
     global start
 
-    bpm_delay = SAMPLING_FREQUENCY + start - time.time() 
 
     # Detect tempo / bpm
     new_bpm, beats  = librosa.beat.beat_track(
@@ -138,19 +135,25 @@ def m_bpm(audio_data):
     '''
     # Correct the eventual octave error
     if new_bpm < bpm_min or new_bpm > bpm_max:
+        found = False
         octaveErrorList = [ 0.5, 2, 0.3333, 3 ]
         for key,factor in enumerate(octaveErrorList):
             correction = new_bpm * factor
             if correction > bpm_min and correction < bpm_max:
-                debug( "Corrected bpm to:{}".format(correction))
+                debug( "Corrected high/low bpm:{} to:{}".format(new_bpm, correction))
                 new_bpm = correction
+                found = True
                 break
+        if found == False:
             if new_bpm < bpm_min :
                 new_bpm = bpm_min
             else :
                 new_bpm = bpm_max
       
+    debug("new_bpm:{}".format(new_bpm))
     '''
+    How to guess the next beats based on the data sent to redis
+                    ~~  A Dirty Graph ~~
 
                  |start                end|
      Capture     |........................|
@@ -167,22 +170,29 @@ def m_bpm(audio_data):
      . passed                            (...b....b....b.)
      . guessed                                           (..b....b....b....b...
      Next Beat Calculation              b....b....b....b.|..b
+     Beats                              |last beat
+                                        0    1    2    3    4
 
-             => (Delay - last beat) + x*BPM/60 (with x >= read_delay/BPM/60)
      Redis:    
-     bpm_sample_interval
+
-                 |........................|               
+     key         bpm_sample_interval
-     bpm_delay
+     visual      |........................|               
-                 |.........................|             
+
+     key         bpm_delay
+     visual      |.........................|             
                 
     '''
     bpm = new_bpm
+    bpm_sample_interval = SAMPLING_FREQUENCY * 1000
+    bpm_delay = (SAMPLING_FREQUENCY + time.time() - start ) * 1000
+    pexpireat = int( 2 * bpm_sample_interval);
     #  Save to Redis 
-    r.set( 'bpm', new_bpm, px=( 2* int(SAMPLING_FREQUENCY * 1000)))
+    r.set( 'bpm', round(bpm,2), px = pexpireat )
-    r.set( 'bpm_sample_interval', SAMPLING_FREQUENCY )
+    r.set( 'bpm_sample_interval', bpm_sample_interval )
     r.set( 'bpm_delay', bpm_delay )
     r.set( 'beats', json.dumps( beats.tolist() ) )
-    debug( "bpm:{} bpm_delay:{} beats:{}".format(bpm,bpm_delay,beats) )
+    #debug( "pexpireat:{}".format(pexpireat))
+    debug( "bpm:{} bpm_delay:{} bpm_sample_interval:{} beats:{}".format(bpm,bpm_delay,bpm_sample_interval,beats) )
     return True
 
 def m_spectrum(audio_data):
@@ -250,6 +260,7 @@ if MODE == 'spectrum':
 elif MODE == 'bpm':
     debug("In this mode, we will set keys: onset, bpm, beats")
 
+p = pyaudio.PyAudio()
 stream = p.open(format=pyaudio.paFloat32,
                 channels=CHANNELS,
                 rate=RATE,