Direct Sound Library

[scalion]

Hi all, Hi everyone,
I fought with the impressive code of Russell Hayward and John Findlay demonstrating the use of Direct Sound in GFA-Basic.
Based largely on Microsoft's C examples for DSShow.
I deleted the DSFile () global table because we cannot export such a table in a library. I replaced it with a dynamic allocation based on Malloc () and MRealloc ().
I also modified the UDT DSFILEINFO by adding a new UDT (WAVEEXTRAINFO_STRUCT) allowing me to manage 8 duplicated buffers for each wave and thus to be able to play the same sample 8 times simultaneously in cluttering the memory.
I also simplified the calling of the functions a lot.

But unfortunaly i dont know how to apply an effect like the WaveOut demo of JMM... ...maybe another day.

New version available (10/04/2021)

The lg32 library :  DSoundLib.lg32 (20.44 KB)

The source GFABasic32 :DSoundLib.G32 (67.33 KB)

You will have help on using this library with the rtf file : DSound Library Help.rtf (7.84 KB)

See an using example (non exhaustive) : Mini Synth Thread

[scalion]

New version available, first post is updated with.

New function : DS_WaveFromDblArray(Hertz%, Channels%, BitsPerSample%, dCount%, ByRef d() As Double) As Long

Fill your double array with amplitude between -1 to 1, you can use value outside this range, but your sound will be simply saturated.

- Hertz can have value from _MinFrequency to _MaxFrequency (generally 100 to 200000)
- Channel can be 1 (mono) or 2 (stereo)
- BitPerSample can be 8 or 16, if incorrect value passe it's raised to 8 bits.
- dCount : Number of sample to process, it can be 1 (no sense) to dim?(d()) max.
- d() an array of double who store amplitude values.

The function return an index to DirectSound Structure.
You can play it like wave created with DS_LoadWave or DS_DuplicateWave, example :


MyNiceSound = DS_WaveFromDblArray(44100, 2, 16, 10000, MyDataWave())
DS_Play MyNiceSound