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Simple audio recognition library.

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# Khalzam
This library is very poorly designed and was written purely as proof-of-concept.
I have rewritten it in Rust and the main development is going [here](https://github.com/kisasexypantera94/khalzam-rs).

## About
Khalzam is a simple audio recognition library. Its algrorithm is based on
[this article](https://www.toptal.com/algorithms/shazam-it-music-processing-fingerprinting-and-recognition) by Jovan Jovanovic

## Dependencies
Fingerprint library uses mpg123 (thinking of switching to a native solution) so you need to install it:
#### macOS (Homebrew)
```
$ brew install mpg123
```
#### Debian
```
$ sudo apt-get install libmpg123-dev
```

## Setup
You need to create and initialize database:
```
$ createdb -O user databasename
$ psql -f createdb.sql databasename
```

## Usage
#### Shell mode
```
$ DBUSER=kisasexypantera94 DBNAME=khalzam go run shell.go
Initializing library...

MusicLibrary interactive shell
>>> help

Commands:
  clear             clear the screen
  delete            delete audio from database
  exit              exit the program
  help              display help
  index             index audiofile
  indexdir          index directory
  recognize         recognize audiofile
  recognizedir      recognize directory

>>> index resources/Modjo\ -\ Lady\ $Hear\ Me\ Tonight$.mp3
Indexing 'resources/Modjo - Lady (Hear Me Tonight).mp3'...
>>> recognize samples/modjo_lady_sample.mp3
Recognizing 'samples/modjo_lady_sample.mp3'...
Best match: Modjo - Lady (Hear Me Tonight) (11% matched)
```

#### API
```golang
package main

import (
	"fmt"
	"github.com/kisasexypantera94/khalzam/musiclibrary"
	_ "github.com/lib/pq"
)

func main() {
	cfg := &musiclibrary.Config{
		User:     os.Getenv("DBUSER"),
		Password: os.Getenv("DBPASSWORD"),
		DBname:   os.Getenv("DBNAME"),
		Host:     os.Getenv("DBHOST"),
		Port:     os.Getenv("DBPORT"),
	}

musicLib, _ := musiclibrary.Open(cfg)
	defer musicLib.Close()

musicLib.Index("resources/Modjo - Lady (Hear Me Tonight).mp3")
	result := musicLib.Recognize("samples/modjo_lady_sample.mp3")
	fmt.Println(result)
}
```

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