57 lines
1.8 KiB
Markdown
57 lines
1.8 KiB
Markdown
# VAG files
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> VAG is the PlayStation single waveform data format for ADPCM-encoded data of sampled sounds, such as
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piano sounds, explosions, and music. The typical extension in DOS is “.VAG”.
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See [FileFormat47.pdf](http://psx.arthus.net/sdk/Psy-Q/DOCS/FileFormat47.pdf), p.209
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## Audio to VAG conversion
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We have to convert the audio file to RAW data first :
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```bash
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ffmpeg -i input.mp3 -f s16le -ac 1 -ar 44100 tmp.dat
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```
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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 :
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```bash
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wav2vag tmp.dat output.vag -sraw16 -freq=44100
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```
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## VAGedit
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You can find a graphical editor in the [PsyQ sdk](http://psx.arthus.net/sdk/Psy-Q/PSYQ_SDK.zip) named `VAGEDIT.exe`.
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## C VAG structure
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Here is a structure definition to access the VAG header :
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See [FileFormat47.pdf](http://psx.arthus.net/sdk/Psy-Q/DOCS/FileFormat47.pdf), p.209 for full description.
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```c
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typedef struct VAGhdr { // All the values in this header must be big endian
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char id[4]; // VAGp 4 bytes -> 1 char * 4
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unsigned int version; // 4 bytes
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unsigned int reserved; // 4 bytes
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unsigned int dataSize; // (in bytes) 4 bytes
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unsigned int samplingFrequency; // 4 bytes
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char reserved2[12]; // 12 bytes -> 1 char * 12
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char name[16]; // 16 bytes -> 1 char * 16
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// Waveform data after that
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} VAGhdr;
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```
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## VAG & SPU Docs
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See
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* libformat47.pdf p.209
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* libover47.pdf, p.271
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* libref47.pdf, p.980
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* [http://psx.arthus.net/code/VAG/](http://psx.arthus.net/code/VAG)
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## Ressources
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* [wav2vag utility](https://github.com/ColdSauce/psxsdk/blob/master/tools/wav2vag.c)
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