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| #!/usr/bin/env python3 | |
| import glob | |
| import os | |
| import requests | |
| from io import BytesIO | |
| from flask import Flask, send_file, request, Response, stream_with_context | |
| from flask_restful import Resource, Api | |
| from flask.ext.cors import CORS | |
| from pydub import AudioSegment | |
| from collections import deque | |
| from itertools import islice | |
| app = Flask(__name__) | |
| api = Api(app) | |
| CORS(app) | |
| class AudioList(Resource): | |
| def get(self): | |
| files = glob.glob("audio/*") | |
| return {'files': files} | |
| def generate(audio,fmt,codec,window_size=1000): | |
| cursor=0 | |
| chunktime=(window_size / 1000) | |
| end=len(audio) | |
| au_buf=BytesIO() | |
| while cursor+window_size < end: | |
| au_buf.seek(0) | |
| audio[cursor:cursor+window_size].export(au_buf, format=fmt,codec=codec) | |
| cursor+=window_size | |
| au_buf.seek(0) | |
| yield au_buf.read() | |
| def request_conv(url,fmt,codec,gain=None): | |
| b_size=102400 | |
| r = requests.get(url, stream=True) | |
| r.raw.decode_content = True | |
| in_buf=BytesIO() | |
| au_buf=BytesIO() | |
| for chunk in r.iter_content(b_size): | |
| print("converting chunk") | |
| in_buf=BytesIO() | |
| in_buf.write(chunk) | |
| in_buf.seek(0) | |
| in_fmt=r.headers['content-type'].split('/')[1] | |
| orig = AudioSegment.from_file(in_buf, format=in_fmt) | |
| if gain: | |
| orig=orig.apply_gain(gain) | |
| orig.export(au_buf, format=fmt,codec=codec) | |
| au_buf.seek(0) | |
| yield au_buf.read() | |
| @app.route('/convert/<path:url>') | |
| def stream_convert(url): | |
| try: | |
| brate=request.args['bitrate'] | |
| except: | |
| brate="128k" | |
| try: | |
| fmt=request.args['fmt'].lower() | |
| except: | |
| fmt="mp3" | |
| try: | |
| codec=request.args['codec'].lower() | |
| except: | |
| codec="libmp3lame" | |
| fmt_mime={ | |
| "mp3":"audio/mpeg", | |
| "ogg":"audio/ogg", | |
| "mp4":"audio/mp4" | |
| } | |
| try: | |
| gain=request.args['gain'] | |
| except: | |
| gain=None | |
| return Response(request_conv(url,fmt,codec,gain),mimetype=fmt_mime[fmt]) | |
| @app.route('/audio/<path:path>') | |
| def serve_audio(path): | |
| try: | |
| brate=request.args['bitrate'] | |
| except: | |
| brate="128k" | |
| try: | |
| fmt=request.args['fmt'].lower() | |
| except: | |
| fmt="mp3" | |
| try: | |
| codec=request.args['codec'].lower() | |
| except: | |
| codec="libmp3lame" | |
| fmt_mime={ | |
| "mp3":"audio/mpeg", | |
| "ogg":"audio/ogg", | |
| "mp4":"audio/mp4" | |
| } | |
| try: | |
| gain=request.args['gain'] | |
| except: | |
| gain=None | |
| orig = AudioSegment.from_file("./audio/"+path, format="flac") | |
| if gain: | |
| orig=orig.apply_gain(gain) | |
| return Response(generate(orig,fmt,codec),mimetype=fmt_mime[fmt]) | |
| api.add_resource(AudioList, '/') | |
| if __name__ == '__main__': | |
| app.run(debug=True) |
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Example requests:
http://localhost:5000/audio/testfile.flac?gain=+1000&fmt=ogg&codec=libvorbis&bitrate=128k
http://localhost:5000/convert/http://example.com/testfile.wav?gain=+1000&fmt=mp3&codec=libmp3lame&bitrate=192k