commit eab831fe8bee7c75ac15e13c1a3e5434fa694fa8
Author: Navan Chauhan <navanchauhan@gmail.com>
Date:   Mon Mar 9 22:25:20 2020 +0530

    Initial Commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ac43ebc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.pyc
+*.py~
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2e5c6e0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,47 @@
+# V A P O R W A V E
+A ｖａｐｏｒｗａｖｅ music (+art, +video soon, I promise) generator bodged together using code from various sources ( Hopefully I have credited all of them in the source code). Runs on Python3
+
+## Installation
+
+This was tested on macOS Catalina ( so should work on almost all macOS versions).
+Windows is unsupported at this time ( I need to find a way to use aubio's python module)
+
+### Dependencies
+
+#### Linux
+
+```
+sudo apt install ffmpeg libavl1 sox
+pip install -r requirements.txt
+```
+
+#### macOS
+
+Make sure you have brew installed
+
+```
+brew install noah # I would have had to re-compile the executeable :(
+brew install sox
+pip install -r requirements.txt
+
+## Usage
+
+### YouTube URL
+```
+python3 main.py <YOUTUBE_URL>
+```
+### Song Title
+```
+python3 main.py Song Title
+```
+
+## Bugs
+
+This project is a result of bodging and therefore has tons of bugs which need to be ironed out
+
+## To-Do
+
+[ ] Move away from using os.system calls, and use Python modules instead ( Looking at you, Sox and aubio)
+[ ] Clean the Code
+[ ] Add Artwork Generator
+[ ] Add Video Generator
diff --git a/VaporSong.py b/VaporSong.py
new file mode 100644
index 0000000..0d55a97
--- /dev/null
+++ b/VaporSong.py
@@ -0,0 +1,180 @@
+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
+		os.system("ulimit -n " + str(tmpFileLimit))
+		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")
diff --git a/get-beats b/get-beats
new file mode 100755
index 0000000..cbe5203
Binary files /dev/null and b/get-beats differ
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..7b84260
--- /dev/null
+++ b/main.py
@@ -0,0 +1,127 @@
+from VaporSong import VaporSong
+import os
+import sys
+import youtube_dl
+import logzero
+from logzero import logger
+from logzero import setup_logger
+import re
+import urllib.request
+import urllib.parse
+
+import time
+
+MAX_DURATION = 600 # In-case the program finds a compilation
+youtube_urls = ('youtube.com', 'https://www.youtube.com/', 'http://www.youtube.com/', 'http://youtu.be/', 'https://youtu.be/', 'youtu.be')
+
+def download_file(query,request_id=1):
+    """Returns audio to the vapor command handler
+
+    Searches YouTube for 'query', finds first match that has
+    duration under the limit, download video with youtube_dl
+    and extract .wav audio with ffmpeg.
+
+    Query can be YouTube link. 
+    """
+    ydl_opts = {
+        'quiet': 'True',
+        'format': 'bestaudio/best',
+        'outtmpl': str(request_id) +'.%(ext)s',
+        'prefer_ffmpeg': 'True', 
+        'noplaylist': 'True',
+        'postprocessors': [{
+            'key': 'FFmpegExtractAudio',
+            'preferredcodec': 'wav',
+            'preferredquality': '192',
+        }],
+    }
+
+    original_path = str(request_id) + ".wav"
+    file_title = ""
+
+    # check if query is youtube url
+    if not query.lower().startswith((youtube_urls)):
+        # search for youtube videos matching query
+        query_string = urllib.parse.urlencode({"search_query" : query})
+        html_content = urllib.request.urlopen("http://www.youtube.com/results?" + query_string)
+        search_results = re.findall(r'href=\"\/watch\?v=(.{11})', html_content.read().decode())
+        info = False
+
+        # find video that fits max duration
+        logger.info("Get video information...")
+        for url in search_results:
+            # check for video duration
+            try:
+                info = youtube_dl.YoutubeDL(ydl_opts).extract_info(url,download = False)
+            except Exception as e:
+                logger.error(e)
+                raise ValueError('Could not get information about video.')
+            full_title = info['title']
+            if (info['duration'] < MAX_DURATION and info['duration'] >= 5):
+                # get first video that fits the limit duration
+                logger.info("Got video: " + str(full_title))
+                file_title = info['title']
+                break
+        
+        # if we ran out of urls, return error
+        if (not info):
+            raise ValueError('Could not find a video.')
+
+    # query was a youtube link
+    else:
+        logger.info("Query was a YouTube URL.")
+        url = query
+        info = youtube_dl.YoutubeDL(ydl_opts).extract_info(url,download = False)
+        file_title = info['title']
+        # check if video fits limit duration
+        if (info['duration'] < 5 or info['duration'] > MAX_DURATION):
+            raise ValueError('Video is too short. Need 5 seconds or more.')
+
+    # download video and extract audio
+    logger.info("Downloading video...")
+    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
+        try:
+            ydl.download([url])
+        except Exception as e:
+            logger.error(e)
+            raise ValueError('Could not download ' + str(full_title) + '.')
+
+    return original_path, file_title
+
+
+def gen_vapor(filePath, title):
+	# Delete stuff if there is anything left over.
+	os.system("rm -r download/")
+	os.system("rm -r beats/")
+
+    # Make the proper folders for intermediate steps
+	os.system("mkdir download/")
+	os.system("mkdir beats/")
+
+
+	# Download the youtube query's first result. Might be wrong but YOLO
+	#YTDownloader.download_wav_to_samp2(query)
+
+	# For every song in download folder(just one for now)
+	"""
+	for fs in os.listdir("download/"):
+		# Slow down the song.
+		VaporSong.vaporize_song(query,"download/"+fs)
+		pass
+	# When we are finished, delete the old folders.
+	"""
+	VaporSong.vaporize_song(filePath, title)
+
+	os.system("rm -r download/")
+	os.system("rm -r beats/")
+
+
+	
+## Makes this a command line tool: disable when we get the webserver going
+sys.argv.pop(0)
+query = ""
+for s in sys.argv:
+	query = query + s
+
+name, title = download_file(query)
+gen_vapor(name, title)