nolibgs_hello_worlds/VAG/README.md

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# VAG files
> VAG is the PlayStation single waveform data format for ADPCM-encoded data of sampled sounds, such as
piano sounds, explosions, and music. The typical extension in DOS is “.VAG”.
See [FileFormat47.pdf](http://psx.arthus.net/sdk/Psy-Q/DOCS/FileFormat47.pdf), p.209
## Audio to VAG conversion
We have to convert the audio file to RAW data first :
```bash
ffmpeg -i input.mp3 -f s16le -ac 1 -ar 44100 tmp.dat
```
then use [`wav2vag`](https://github.com/ColdSauce/psxsdk/blob/master/tools/wav2vag.c) to convert the data, making sure the `-freq=` parameter matches the `-ar` value used above :
```bash
wav2vag tmp.dat output.vag -sraw16 -freq=44100
```
## VAGedit
You can find a graphical editor in the [PsyQ sdk](http://psx.arthus.net/sdk/Psy-Q/PSYQ_SDK.zip) named `VAGEDIT.exe`.
## VAG & SPU Docs
See
* libformat47.pdf p.209
* libover47.pdf, p.271
* libref47.pdf, p.980
* [http://psx.arthus.net/code/VAG/](http://psx.arthus.net/code/VAG)
## Ressources
* [wav2vag utility](https://github.com/ColdSauce/psxsdk/blob/master/tools/wav2vag.c)