1 files changed, 182 insertions, 0 deletions
diff --git a/src/VaporSong.py b/src/VaporSong.py
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+++ b/src/VaporSong.py
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+import os
+import subprocess
+import re
+from random import randint
+
+import logzero
+from logzero import logger
+from logzero import setup_logger
+
+CONFIDENCE_THRESH = 0.02
+
+class VaporSong:
+
+	# Slows down Track
+	
+	def slow_down(src, rate, dest):
+		cmd = "sox -G -D " + src + " " + dest + " speed " + str(rate)
+		os.system(cmd)
+		return dest
+
+	# Adds Reverb
+	
+	def reverbize(src, dest):
+		cmd = "sox -G -D " + src + " " + dest + " reverb 100 fade 5 -0 7" # idk what this does tbh, https://stackoverflow.com/a/57767238/8386344
+		os.system(cmd)
+		return dest
+
+	
+	# Crops "src" from "start" plus "start + dur" and return it in "dest"
+	def crop(src,dest,start,dur):
+		cmd = "sox " + src + " " + dest + " trim " + " " + str(start) + " " + str(dur)
+		os.system(cmd)
+
+	
+	# Randomly crops a part of the song of at most max_sec_len.
+	def random_crop(src, max_sec_len, dest):
+		out = subprocess.check_output(["soxi","-D",src]).rstrip()
+		f_len = int(float(out))
+		if (f_len <= max_sec_len):
+			os.system("cp " + src + " " + dest)
+			return
+		else:
+			start_region = f_len - max_sec_len
+			start = randint(0,start_region)
+			VaporSong.crop(src,dest,start,max_sec_len)
+
+	
+	# Given a file, returns a list of [beats, confidence], executable based on audibo's test-beattracking.c 
+	# TODO: Move away from executable and use aubio's Python module
+	def fetchbeats(src):
+		beat_matrix = []
+		if os.name == 'posix':
+			beats = subprocess.check_output(["noah", "get-beats",src]).rstrip()
+		else:
+			beats = subprocess.check_output(["get-beats",src]).rstrip()
+		beats_ary = beats.splitlines()
+		for i in beats_ary:
+			record = i.split()
+			record[0] = float(record[0])/1000.0
+			record[1] = float(record[1])
+			beat_matrix.append(record)
+		return beat_matrix
+
+	# Splits an audio file into beats according to beat_matrix list
+	
+	def split_beat(src,beat_matrix):
+		split_files = []
+		for i in range(0,len(beat_matrix)-1):
+
+			if(beat_matrix[i][1] > CONFIDENCE_THRESH):
+				dur = (beat_matrix[i+1][0] - beat_matrix[i][0])
+				out = src.split(".")[0]+str(i)+".wav"
+				VaporSong.crop(src,out,beat_matrix[i][0],dur)
+				split_files.append(out)
+		return split_files
+
+	# Combines a list of sections
+	
+	def combine(sections,dest):
+		tocomb = []
+		tocomb.append("sox")
+		tocomb.append("-G")
+		for section in sections:
+			for sample in section:
+				tocomb.append(sample)
+		tocomb.append(dest)
+		tmpFileLimit = len(tocomb) + 256 # in case the program messes up, it does not actually frick up your system
+		n = str(tmpFileLimit)
+		#logger.info("Setting file limit to ", n)
+		os.system("ulimit -n " + n)
+		subprocess.check_output(tocomb)
+		return dest
+
+	# Arbitrarily groups beats into lists of 4, 6, 8, or 9, perfect for looping.
+	
+	def generate_sections(ary):
+		sections = []
+		beats = [4,6,8,9]
+		index = 0
+		while(index != len(ary)):
+			current_beat = beats[randint(0,len(beats)-1)]
+			new_section = []
+			while((current_beat != 0) and (index != len(ary))):
+				new_section.append(ary[index])
+				current_beat -= 1
+				index += 1
+			sections.append(new_section)
+		return sections
+
+	
+	# given a list of sections, selects some of them and duplicates them, perfect for that vaporwave looping effect
+	def dup_sections(sections):
+		new_section = []
+		for section in sections:
+			new_section.append(section)
+			if(randint(0,1) == 0):
+				new_section.append(section)
+		return new_section
+
+	# a passage is a list of sections. This takes some sections and groups them into passages.
+	
+	def make_passages(sections):
+		passages = []
+		index = 0
+		while(index != len(sections)):
+			passage_len = randint(1,4)
+			passage = []
+			while(index != len(sections) and passage_len > 0):
+				passage.append(sections[index])
+				index += 1
+				passage_len -= 1
+			passages.append(passage)
+		return passages
+
+	# Given all of our passages, picks some of them and inserts them into a list some number of times.
+	
+	def reorder_passages(passages):
+		new_passages = []
+		passage_count = randint(5,12)
+		while(passage_count != 0):
+			passage = passages[randint(0,len(passages)-1)]
+			passage_count -= 1
+			dup = randint(1,4)
+			while(dup != 0):
+				dup -= 1
+				new_passages.append(passage)
+		return new_passages
+
+	# converts a list of passages to a list of sections.
+	
+	def flatten(passages):
+		sections = []
+		for passage in passages:
+			for section in passage:
+				sections.append(section)
+		return sections
+
+	# It's all coming together
+	
+	def vaporize_song(fname, title):
+		logger.info("Slowing down the music")
+		VaporSong.slow_down(fname, 0.7, "beats/out.wav")
+		#logger.info("Cropping")
+		#VaporSong.random_crop("beats/out.wav",150,"beats/outcrop.wav")
+		logger.info("Doing Beat Analysis")
+		bm = VaporSong.fetchbeats("beats/out.wav")
+		logger.info("Split into beats")
+		splitd = VaporSong.split_beat("beats/out.wav",bm)
+		#group beats to sections
+		logger.info("Divide into sections")
+		sections = VaporSong.generate_sections(splitd)
+		logger.info("Duping Sections")
+		sdup = VaporSong.dup_sections(sections)
+		# group sections into passages
+		paslist = VaporSong.make_passages(sdup)
+		# reorder packages
+		pasloop = VaporSong.reorder_passages(paslist)
+		sectionflat = VaporSong.flatten(pasloop)
+		logger.info("Mastering & Reverbing")
+		VaporSong.combine(sectionflat,"beats/out_norev.wav")
+		VaporSong.reverbize("beats/out_norev.wav","./" + (re.sub(r"\W+|_", " ", title)).replace(" ","_") + ".wav")
+		logger.info("Generated V A P O R W A V E")