24.1 Overview

Plugins that have the capability flag HWPLUG_CAPS_SOUND set will be called whenever Hollywood has to load a sample or music. The plugin can check then whether the file is in a format that the plugin recognizes and if it is, it can open the sound file and stream the raw PCM data to Hollywood. This makes it possible to load custom sound file formats with Hollywood.

By default, sound plugins are automatically activated when Hollywood loads them. Starting with Hollywood 6.0 this behaviour can be changed by setting the HWEXT_SOUND_NOAUTOINIT extension bit. If this bit is set, Hollywood will not automatically activate your plugin at load time. Instead, you will have to manually call hw_AddLoaderAdapter() to activate your plugin. For example, you could call hw_AddLoaderAdapter() from your RequirePlugin() implementation. In that case, the sound plugin would only be activated if the user called @REQUIRE on it. If you do not call hw_AddLoaderAdapter() on a plugin that has auto-initialization disabled, it will only be available if the user addresses it directly through the Loader tag. See Extension plugins to learn how to use plugin extension bits.

The SDK distribution comes with an example sound plugin which contains a loader for the AIFF sound format. Feel free to study this example code to learn how sound plugins are written in practice.

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