Xojo Sound object from Memoryblock?

  1. 4 months ago

    Aaron H

    Aug 6 Pre-Release Testers Europe (Germany)
    Edited 4 months ago

    I need to play back PCM data from a Memoryblock, x-plat, for 64-bit builds.

    For the past decade I've been using the OpenAL wrapper written by Thomas Cunningham and Roger Meier to do this, and it works flawlessly for 32-bit builds. It doesn't work in 64-bit builds. (Development of the OpenAL library was abandoned years ago.)

    The Xojo Sound object requires the resource to either be added to the project, or opened from a file. When working with PCM data in RAM, this requires adding audio headers and saving a file and loading it before a sound can be played. This is not an acceptable option especially on Mac because of all the security hoops Apple's file system has become ridiculously slow.

    I use MBS plugins, and I know there are classes for streaming audio, and I've used them, and they work, but they seem a bit overkill for simply playing back a chunk of PCM data in memory. I'm looking for an uncomplicated solution like I had with OpenAL, for 64-bits.

    What I'd like is to be able to create a Xojo Sound object from a Memoryblock instead of a file. Even if I have to add WAV headers to the PCM, it would be better than having to save and load a file.

    Maybe I'm missing something simple here ... can I create a WAV file as a Folderitem in RAM, without saving and loading it, and open that?

  2. Emile S

    Aug 6 Europe (France, Strasbourg)

    @Aaron H Apple's file system has become ridiculously slow

    Blackmagic Disk Speed Test.app (App Store, free) will give you the HD (or better, the SSD) speed in Read and Write.

    A HD I was believing it be fast, was reported very slow (I do not know why),around 10MBs/s… instead of around 100MBs/s for more recents HD.

or Sign Up to reply!