feat(files): add possibility to set the audio quality of downloaded files

it is possible now to se audio quality of files using environment variables (QUALITY)

close #39

README.md

@@ -79,13 +79,13 @@ services:
 Spooty can be also build from source files on your own.
 
 #### Requirements
-- Node v18.19.1 (it is recommended to use `nvm` node version manager to install proper version of node)
+- Node v20.20.0 (it is recommended to use `nvm` node version manager to install proper version of node)
 - Redis in memory cache
 - Ffmpeg
 - Python3
 
 #### Process
-- install Node v18.19.1 using `nvm install` and use that node version `nvm use`
+- install Node v20.20.0 using `nvm install` and use that node version `nvm use`
 - from project root install all dependencies using `npm install`
 - copy `.env.default` as `.env` in `src/backend` folder and modify desired environment properties (see [environment variables](#environment-variables))
 - add your Spotify application credentials to the `.env` file:
@@ -102,11 +102,12 @@ Spooty can be also build from source files on your own.
 Some behaviour and settings of Spooty can be configured using environment variables and `.env` file.
 
  Name                 | Default                                     | Description                                                                                                                                   |
-----------------------|---------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+----------------------|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|
  DB_PATH              | `./config/db.sqlite` (relative to backend)  | Path where Spooty database will be stored                                                                                                     |
  FE_PATH              | `../frontend/browser` (relative to backend) | Path to frontend part of application                                                                                                          |
  DOWNLOADS_PATH       | `./downloads` (relative to backend)         | Path where downaloded files will be stored                                                                                                    |
- FORMAT               | `mp3`                                       | Format of downloaded files (currently fully supported only `mp3` but you can try whatever you want from [ffmpeg](https://ffmpeg.org/ffmpeg-formats.html#Muxers)) |
+ FORMAT               | `mp3`                                       | Format of downloaded files ('aac', 'flac', 'mp3', 'm4a', 'opus', 'vorbis', 'wav', 'alac')                                                     |
+ QUALITY              | undefined                                   | Audio quality (0-9 VBR or specific bitrate) of downloaded files                                                                               |
  PORT                 | 3000                                        | Port of Spooty server                                                                                                                         |
  REDIS_PORT           | 6379                                        | Port of Redis server                                                                                                                          |
  REDIS_HOST           | localhost                                   | Host of Redis server                                                                                                                          |

src/backend/.env.default

@@ -2,6 +2,7 @@ DB_PATH=./config/db.sqlite
 FE_PATH=../frontend/browser
 DOWNLOADS_PATH=./downloads
 FORMAT=mp3
+QUALITY=
 PORT=3000
 REDIS_PORT=6379
 REDIS_HOST=localhost

src/backend/src/shared/youtube.service.ts

@@ -42,6 +42,7 @@ export class YoutubeService {
         cookiesFromBrowser: this.configService.get<string>('YT_COOKIES'),
         headers: HEADERS,
         jsRuntime: 'node',
+        audioQuality: this.configService.get<string>('QUALITY'),
       },
     );
     this.logger.debug(