comparison base/AudioPlaySource.h @ 389:a1b6d2e33cab

* document library dependencies
* remove dependency of transform on audioio

     COPYING included with this distribution for more information.
 */
 
 #ifndef _AUDIO_PLAY_SOURCE_H_
 #define _AUDIO_PLAY_SOURCE_H_
+
+struct Auditionable {
+    virtual ~Auditionable() { }
+};
 
 /**
  * Simple interface for audio playback.  This should be all that the
  * ViewManager needs to know about to synchronise with playback by
  * sample frame, but it doesn't provide enough to determine what is

      * Return the sample rate set by the target audio device (or the
      * source sample rate if the target hasn't set one).  If the
      * source and target sample rates differ, resampling will occur.
      */
     virtual size_t getTargetSampleRate() const = 0;
-     
+
+    /**
+     * Get the block size of the target audio device.  This may be an
+     * estimate or upper bound, if the target has a variable block
+     * size; the source should behave itself even if this value turns
+     * out to be inaccurate.
+     */
+    virtual size_t getTargetBlockSize() const = 0;
+
+    /**
+     * Get the number of channels of audio that will be provided
+     * to the play target.  This may be more than the source channel
+     * count: for example, a mono source will provide 2 channels
+     * after pan.
+     */
+    virtual size_t getTargetChannelCount() const = 0;
+
+    /**
+     * Set a plugin or other subclass of Auditionable as an
+     * auditioning effect.
+     */
+    virtual void setAuditioningEffect(Auditionable *) = 0;
+
 };
 
 #endif