ITU-R_BS.1770-4_cpp

# ITU-R_BS.1770-4_cpp <center> Jason [2021/06] </center> ## Introduction This project implements the standard ITU-R BS.1770-4 in C/C++, along with other applications relevantly. The ITU-R BS.1770-4 specifies audio measurement algorithms for the purpose of determining subjective programme loudness, and true-peak signal level. ## Usage First download 7 files : 1. test_wav file 2. vector_operation.h 3. Wav.h 4. LKFS.h 5. Normalize.h 6. main.cpp 7. Makefile Store them under the same directory, then open your terminal ``` $ make ``` This automatically makes main.cpp compiled. There are four main applications. Compute integrated loudness : ``` $ ./BS1770 -l <wav> ``` K-filter the audio : ``` $ ./BS1770 -k <wav> ``` Peak normalize the audio : ``` $ ./BS1770 -n -p <target> <wav> ``` Loudness normalize the audio : ``` $ ./BS1770 -n l <target> <wav> ``` :::info <target> sub with your target loudness, should be negative double (in LKFS) <wav> sub with the file name of your .wav ::: To delete produced file : ``` $ make clean_all ``` To delete k-filtered wav : ``` $ make clean_kfilt_wav ``` To delete normalized k-filtered wav : ``` $ make clean_norm_wav ``` Test functions by sample wav: ``` $ make test_LKFS ``` ``` $ make test_Kfilter ``` ``` $ make test_Peak_Normalize ``` ``` $ make test_Loudness_Normalize ``` further help : ``` $ ./BS1770 -h ``` ## References The code has taken references from [pyloudnorm](https://github.com/csteinmetz1/pyloudnorm)[1] and [loudness.py](https://github.com/BrechtDeMan/loudness.py)[2]. [1]Steinmetz, Christian J. and Reiss, Joshua D., "pyloudnorm : a simple yet flexible loudness meter in Python" [2]Brecht De Man, "Evaluation of Implementations of the EBU R128 Loudness Measurement," 145th International Convention of the Audio Engineering Society, October 2018. ## Authors JasonHo, undergraduate, major in Computer Science and Music. CyChiang, professor, superviser. ## Original Hackmd https://hackmd.io/@jasonho610/SyOOtVH9O