Signal an error if aac decoding fails early.

            mConfig->aacPlusUpsamplingFactor, mConfig->desiredChannels);

        CHECK(mNumDecodedBuffers > 0);

        if (decoderErr != MP4AUDEC_SUCCESS) {

            // If decoding fails this early, the fields in mConfig may

            // not be valid and we cannot recover.

            LOGE("Unable to decode aac content, decoder returned error %d",

                 decoderErr);

            buffer->release();

            buffer = NULL;

            mInputBuffer->release();

            mInputBuffer = NULL;

            return ERROR_UNSUPPORTED;

        }

        if (mNumDecodedBuffers == 1) {

            mUpsamplingFactor = mConfig->aacPlusUpsamplingFactor;

            // Check on the sampling rate to see whether it is changed.