source: trunk/src_apollo/org/apollo/gui/WaveFormRenderer.java@ 315

package org.apollo.gui;

/**
 * Provides waveform rendering services.
 * 
 * @author Brook Novak
 */
public interface WaveFormRenderer {

        /**
         * Renders waveforms in a given array of audio samples - producing an array of wave-form 
         * amplitutes ranging for -1.0 to 1.0.
         * 
         * A single height is calculated for one or more frames, which is specified by the
         * aggregationSize. The way in which waveforms are rendered is implementation dependant.
         * 
         * @param audioBytes
         *              The array of pure samples.
         * 
         * @param startFrame
         *              The starting frame to begin rendering
         * 
         * @param frameLength
         *              The amount of frames to consider for rendering.
         * 
         * @param aggregationSize
         *              The amout of frames to aggregate.
         * 
         * @return 
         *              An array of wave-form amplitutes ranging for -1.0 to 1.0.
         *              Note that this will be empty if aggregationSize > frameLength.
         */
        public float[] getSampleAmplitudes(byte[] audioBytes, int startFrame, int frameLength, int aggregationSize);
}