OGG file importer - How to work with the Buffer?

[eXi (Cedric Neukirchen)]

@PatGlynn;666908

Thats right and yes in theory it should work based on just review of the USoundFactory source. The only problematic looking parts of the source is the checks for TEXT(“WAV”) possibly, somehow overminding the reimport process but it doesn’t look immediately prone to issue as long as it still uses your factory for reimport. It would be pretty easy to take the same steps your doing right now and just make a modified version of the Super that checks for OGG or whatever else.

Basically, think of the header for the wav file as a struct of size 44. in the table on that site the offset (first left number) would be the offset of the member in the struct.

I took a look around for a C implementation of the header and found this acipo.com . though i’d caution you that theres likely way more information on that site than you need to accomplish this.

using unreal typedefs the header would look something like this…

So I created me a Wave Header and filled it similar to another page I used.

FWaveHeader MyWaveHeader = CreateWaveHeader(QualityInfo); // QualityInfo holds NumChannels etc already extracted from the OGG file
WaveHeader.Empty(44); // TArray<uint8>
WaveHeader.AddUninitialized(44);
FMemory::Memcpy(WaveHeader.GetData(), &MyWaveHeader, 44);

The struct looks like the one you posted. I tripple checked the values I took (most of them were already filled in despite the chunksize,
but I’m 99% sure that I calculated that correctly as I took the values that the pages tell me to use “NumSamples * NumChannels * BitsPerSample/8”)

I then used ReadCompressedData to

Decompresses ogg vorbis data to raw PCM data.

Then I went ahead and simply appended the TArray<uint8> RawPCMData to my TArray<uint8> WaveHeader.
Now I tried using ReadWaveInfo from FWaveModInfo with the new appended array to check if that runs into any error.
It sadly gets a warning:

Wave data chunk is too big!

But it also cuts it down then, so I ignored it for now.
Then I copied the appended array over to the RawData of the USoundWave, but that doesn’t seem to work, as the I still can’t play it and the output log on import gives me this:

LogAudioDerivedData:Warning: Only mono or stereo 16 bit waves allowed: SoundWave /Game/TheFatRat_-Unity.TheFatRat-Unity (6821314 bytes)
LogAudioDerivedData:Warning: Can’t cook SoundWave /Game/TheFatRat-Unity.TheFatRat-Unity because there is no source compressed or uncompressed PC sound data
LogXAudio2:Warning: Failed to init sound source for wave instance 'TheFatRat-_Unity’ due to invalid buffer or error in compression.

I’m kinda lost at what this could cause. It seems like I really don’t understand how OGG, WAV, uint8* Buffers and all that stuff work.
In theory it seems so simple but I can’t even tell if the data I use can be used like that. I would assume that the ReadCompressedData function of FVorbisAudioInfo should give me the RawPCM Data,
but then again, it might already fail here.