AudioSystem.java 文件源码

/** From a given MixerProvider, return the first appropriate Mixer.
    @param provider The MixerProvider to check for Mixers.
    @param info The type of line the returned Mixer is required to
    support.
    @param isMixingRequired If true, only Mixers that support mixing are
    returned for line types of SourceDataLine and Clip.

    @return A Mixer that is considered appropriate, or null
    if none is found.
 */
private static Mixer getFirstMixer(MixerProvider provider,
                                   Line.Info info,
                                   boolean isMixingRequired) {
    Mixer.Info[] infos = provider.getMixerInfo();
    for (int j = 0; j < infos.length; j++) {
        Mixer mixer = provider.getMixer(infos[j]);
        if (isAppropriateMixer(mixer, info, isMixingRequired)) {
            return mixer;
        }
    }
    return null;
}