      unsigned int(16) PreSkip;
                unsigned int(32) InputSampleRate;
                signed int(16) OutputGain;
                unsigned int(8) ChannelMappingFamily;
                if (ChannelMappingFamily != 0) {
                    ChannelMappingTable(OutputChannelCount);
                }
            }

            class OpusSpecificBox extends Box('dOps') {
                OpusDecoderConfigurationRecord() OpusConfig;
            }

            + Version:
                The Version field s