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
## WAV creation
Use ffmpeg to create a 16-bit ADPCM mono WAV file - change -ar to reduce filesize (and quality)
```bash
$ ffmpeg -i input.mp3 -acodec pcm_s16le -ac 1 -ar 44100 output.wav
```
You can use Audacity to edit sound.
## WAV to VAG convertion using WAV2VAG
Get here : [WAV2VAG](https://github.com/ColdSauce/psxsdk/blob/master/tools/wav2vag.c)
Change -freq according to the -ar setting above
```bash
$ wav2vag input.wav output.vag -sraw16 -freq=44100 (-L)
```
### Bug ?
After conversion with WAV2VAG, the resulting VAG will sometimes have a pop at the very beginning and/or end of the file.
You can check (and delete) this with PsyQ's VAGEDIT.EXE.
You can also force the sampling frequency of an existing VAG file.
## 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)